--- /dev/null
+/* Copyright 2012 STEC, Inc.
+ *
+ * This file is licensed under the terms of the 3-clause
+ * BSD License (http://opensource.org/licenses/BSD-3-Clause)
+ * or the GNU GPL-2.0 (http://www.gnu.org/licenses/gpl-2.0.html),
+ * at your option. Both licenses are also available in the LICENSE file
+ * distributed with this project. This file may not be copied, modified,
+ * or distributed except in accordance with those terms.
+ * Gordoni Waidhofer <gwaidhofer@stec-inc.com>
+ * Initial Driver Design!
+ * Thomas Swann <tswann@stec-inc.com>
+ * Interrupt handling.
+ * Ramprasad Chinthekindi <rchinthekindi@stec-inc.com>
+ * biomode implementation.
+ * Akhil Bhansali <abhansali@stec-inc.com>
+ * Added support for DISCARD / FLUSH and FUA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/blkdev.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/compiler.h>
+#include <linux/workqueue.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/time.h>
+#include <linux/hdreg.h>
+#include <linux/dma-mapping.h>
+#include <linux/completion.h>
+#include <linux/scatterlist.h>
+#include <linux/version.h>
+#include <linux/err.h>
+#include <linux/scatterlist.h>
+#include <linux/aer.h>
+#include <linux/ctype.h>
+#include <linux/wait.h>
+#include <linux/uio.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/sg.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <asm-generic/unaligned.h>
+
+#include "skd_s1120.h"
+
+static int skd_dbg_level;
+static int skd_isr_comp_limit = 4;
+
+enum {
+ STEC_LINK_2_5GTS = 0,
+ STEC_LINK_5GTS = 1,
+ STEC_LINK_8GTS = 2,
+ STEC_LINK_UNKNOWN = 0xFF
+};
+
+enum {
+ SKD_FLUSH_INITIALIZER,
+ SKD_FLUSH_ZERO_SIZE_FIRST,
+ SKD_FLUSH_DATA_SECOND,
+};
+
+#define DPRINTK(skdev, fmt, args ...) \
+ do { \
+ if (unlikely((skdev)->dbg_level > 0)) { \
+ pr_err("%s:%s:%d " fmt, (skdev)->name, \
+ __func__, __LINE__, ## args); \
+ } \
+ } while (0)
+
+#define SKD_ASSERT(expr) \
+ do { \
+ if (unlikely(!(expr))) { \
+ pr_err("Assertion failed! %s,%s,%s,line=%d\n", \
+ # expr, __FILE__, __func__, __LINE__); \
+ } \
+ } while (0)
+
+#define VPRINTK(skdev, fmt, args ...) \
+ do { \
+ if (unlikely((skdev)->dbg_level > 1)) { \
+ pr_err("%s:%s:%d " fmt, (skdev)->name, \
+ __func__, __LINE__, ## args); \
+ } \
+ } while (0)
+
+
+#define DRV_NAME "skd"
+#define DRV_VERSION "2.2.1"
+#define DRV_BUILD_ID "0260"
+#define PFX DRV_NAME ": "
+#define DRV_BIN_VERSION 0x100
+#define DRV_VER_COMPL "2.2.1." DRV_BUILD_ID
+
+MODULE_AUTHOR("bug-reports: support@stec-inc.com");
+MODULE_LICENSE("Dual BSD/GPL");
+
+MODULE_DESCRIPTION("STEC s1120 PCIe SSD block/BIO driver (b" DRV_BUILD_ID ")");
+MODULE_VERSION(DRV_VERSION "-" DRV_BUILD_ID);
+
+#define PCI_VENDOR_ID_STEC 0x1B39
+#define PCI_DEVICE_ID_S1120 0x0001
+
+#define SKD_FUA_NV (1 << 1)
+#define SKD_MINORS_PER_DEVICE 16
+
+#define SKD_MAX_QUEUE_DEPTH 200u
+
+#define SKD_PAUSE_TIMEOUT (5 * 1000)
+
+#define SKD_N_FITMSG_BYTES (512u)
+
+#define SKD_N_SPECIAL_CONTEXT 32u
+#define SKD_N_SPECIAL_FITMSG_BYTES (128u)
+
+/* SG elements are 32 bytes, so we can make this 4096 and still be under the
+ * 128KB limit. That allows 4096*4K = 16M xfer size
+ */
+#define SKD_N_SG_PER_REQ_DEFAULT 256u
+#define SKD_N_SG_PER_SPECIAL 256u
+
+#define SKD_N_COMPLETION_ENTRY 256u
+#define SKD_N_READ_CAP_BYTES (8u)
+
+#define SKD_N_INTERNAL_BYTES (512u)
+
+/* 5 bits of uniqifier, 0xF800 */
+#define SKD_ID_INCR (0x400)
+#define SKD_ID_TABLE_MASK (3u << 8u)
+#define SKD_ID_RW_REQUEST (0u << 8u)
+#define SKD_ID_INTERNAL (1u << 8u)
+#define SKD_ID_SPECIAL_REQUEST (2u << 8u)
+#define SKD_ID_FIT_MSG (3u << 8u)
+#define SKD_ID_SLOT_MASK 0x00FFu
+#define SKD_ID_SLOT_AND_TABLE_MASK 0x03FFu
+
+#define SKD_N_TIMEOUT_SLOT 4u
+#define SKD_TIMEOUT_SLOT_MASK 3u
+
+#define SKD_N_MAX_SECTORS 2048u
+
+#define SKD_MAX_RETRIES 2u
+
+#define SKD_TIMER_SECONDS(seconds) (seconds)
+#define SKD_TIMER_MINUTES(minutes) ((minutes) * (60))
+
+#define INQ_STD_NBYTES 36
+#define SKD_DISCARD_CDB_LENGTH 24
+
+enum skd_drvr_state {
+ SKD_DRVR_STATE_LOAD,
+ SKD_DRVR_STATE_IDLE,
+ SKD_DRVR_STATE_BUSY,
+ SKD_DRVR_STATE_STARTING,
+ SKD_DRVR_STATE_ONLINE,
+ SKD_DRVR_STATE_PAUSING,
+ SKD_DRVR_STATE_PAUSED,
+ SKD_DRVR_STATE_DRAINING_TIMEOUT,
+ SKD_DRVR_STATE_RESTARTING,
+ SKD_DRVR_STATE_RESUMING,
+ SKD_DRVR_STATE_STOPPING,
+ SKD_DRVR_STATE_FAULT,
+ SKD_DRVR_STATE_DISAPPEARED,
+ SKD_DRVR_STATE_PROTOCOL_MISMATCH,
+ SKD_DRVR_STATE_BUSY_ERASE,
+ SKD_DRVR_STATE_BUSY_SANITIZE,
+ SKD_DRVR_STATE_BUSY_IMMINENT,
+ SKD_DRVR_STATE_WAIT_BOOT,
+ SKD_DRVR_STATE_SYNCING,
+};
+
+#define SKD_WAIT_BOOT_TIMO SKD_TIMER_SECONDS(90u)
+#define SKD_STARTING_TIMO SKD_TIMER_SECONDS(8u)
+#define SKD_RESTARTING_TIMO SKD_TIMER_MINUTES(4u)
+#define SKD_DRAINING_TIMO SKD_TIMER_SECONDS(6u)
+#define SKD_BUSY_TIMO SKD_TIMER_MINUTES(20u)
+#define SKD_STARTED_BUSY_TIMO SKD_TIMER_SECONDS(60u)
+#define SKD_START_WAIT_SECONDS 90u
+
+enum skd_req_state {
+ SKD_REQ_STATE_IDLE,
+ SKD_REQ_STATE_SETUP,
+ SKD_REQ_STATE_BUSY,
+ SKD_REQ_STATE_COMPLETED,
+ SKD_REQ_STATE_TIMEOUT,
+ SKD_REQ_STATE_ABORTED,
+};
+
+enum skd_fit_msg_state {
+ SKD_MSG_STATE_IDLE,
+ SKD_MSG_STATE_BUSY,
+};
+
+enum skd_check_status_action {
+ SKD_CHECK_STATUS_REPORT_GOOD,
+ SKD_CHECK_STATUS_REPORT_SMART_ALERT,
+ SKD_CHECK_STATUS_REQUEUE_REQUEST,
+ SKD_CHECK_STATUS_REPORT_ERROR,
+ SKD_CHECK_STATUS_BUSY_IMMINENT,
+};
+
+struct skd_fitmsg_context {
+ enum skd_fit_msg_state state;
+
+ struct skd_fitmsg_context *next;
+
+ u32 id;
+ u16 outstanding;
+
+ u32 length;
+ u32 offset;
+
+ u8 *msg_buf;
+ dma_addr_t mb_dma_address;
+};
+
+struct skd_request_context {
+ enum skd_req_state state;
+
+ struct skd_request_context *next;
+
+ u16 id;
+ u32 fitmsg_id;
+
+ struct request *req;
+ struct bio *bio;
+ unsigned long start_time;
+ u8 flush_cmd;
+ u8 discard_page;
+
+ u32 timeout_stamp;
+ u8 sg_data_dir;
+ struct scatterlist *sg;
+ u32 n_sg;
+ u32 sg_byte_count;
+
+ struct fit_sg_descriptor *sksg_list;
+ dma_addr_t sksg_dma_address;
+
+ struct fit_completion_entry_v1 completion;
+
+ struct fit_comp_error_info err_info;
+
+};
+#define SKD_DATA_DIR_HOST_TO_CARD 1
+#define SKD_DATA_DIR_CARD_TO_HOST 2
+#define SKD_DATA_DIR_NONE 3 /* especially for DISCARD requests. */
+
+struct skd_special_context {
+ struct skd_request_context req;
+
+ u8 orphaned;
+
+ void *data_buf;
+ dma_addr_t db_dma_address;
+
+ u8 *msg_buf;
+ dma_addr_t mb_dma_address;
+};
+
+struct skd_sg_io {
+ fmode_t mode;
+ void __user *argp;
+
+ struct sg_io_hdr sg;
+
+ u8 cdb[16];
+
+ u32 dxfer_len;
+ u32 iovcnt;
+ struct sg_iovec *iov;
+ struct sg_iovec no_iov_iov;
+
+ struct skd_special_context *skspcl;
+};
+
+typedef enum skd_irq_type {
+ SKD_IRQ_LEGACY,
+ SKD_IRQ_MSI,
+ SKD_IRQ_MSIX
+} skd_irq_type_t;
+
+#define SKD_MAX_BARS 2
+
+struct skd_device {
+ volatile void __iomem *mem_map[SKD_MAX_BARS];
+ resource_size_t mem_phys[SKD_MAX_BARS];
+ u32 mem_size[SKD_MAX_BARS];
+
+ skd_irq_type_t irq_type;
+ u32 msix_count;
+ struct skd_msix_entry *msix_entries;
+
+ struct pci_dev *pdev;
+ int pcie_error_reporting_is_enabled;
+
+ spinlock_t lock;
+ struct gendisk *disk;
+ struct request_queue *queue;
+ struct device *class_dev;
+ int gendisk_on;
+ int sync_done;
+
+ atomic_t device_count;
+ u32 devno;
+ u32 major;
+ char name[32];
+ char isr_name[30];
+
+ enum skd_drvr_state state;
+ u32 drive_state;
+
+ u32 in_flight;
+ u32 cur_max_queue_depth;
+ u32 queue_low_water_mark;
+ u32 dev_max_queue_depth;
+
+ u32 num_fitmsg_context;
+ u32 num_req_context;
+
+ u32 timeout_slot[SKD_N_TIMEOUT_SLOT];
+ u32 timeout_stamp;
+ struct skd_fitmsg_context *skmsg_free_list;
+ struct skd_fitmsg_context *skmsg_table;
+
+ struct skd_request_context *skreq_free_list;
+ struct skd_request_context *skreq_table;
+
+ struct skd_special_context *skspcl_free_list;
+ struct skd_special_context *skspcl_table;
+
+ struct skd_special_context internal_skspcl;
+ u32 read_cap_blocksize;
+ u32 read_cap_last_lba;
+ int read_cap_is_valid;
+ int inquiry_is_valid;
+ u8 inq_serial_num[13]; /*12 chars plus null term */
+ u8 id_str[80]; /* holds a composite name (pci + sernum) */
+
+ u8 skcomp_cycle;
+ u32 skcomp_ix;
+ struct fit_completion_entry_v1 *skcomp_table;
+ struct fit_comp_error_info *skerr_table;
+ dma_addr_t cq_dma_address;
+
+ wait_queue_head_t waitq;
+
+ struct timer_list timer;
+ u32 timer_countdown;
+ u32 timer_substate;
+
+ int n_special;
+ int sgs_per_request;
+ u32 last_mtd;
+
+ u32 proto_ver;
+
+ int dbg_level;
+ u32 connect_time_stamp;
+ int connect_retries;
+#define SKD_MAX_CONNECT_RETRIES 16
+ u32 drive_jiffies;
+
+ u32 timo_slot;
+
+
+ struct work_struct completion_worker;
+
+ struct bio_list bio_queue;
+ int queue_stopped;
+
+ struct list_head flush_list;
+};
+
+#define SKD_FLUSH_JOB "skd-flush-jobs"
+struct kmem_cache *skd_flush_slab;
+
+/*
+ * These commands hold "nonzero size FLUSH bios",
+ * which are enqueud in skdev->flush_list during
+ * completion of "zero size FLUSH commands".
+ * It will be active in biomode.
+ */
+struct skd_flush_cmd {
+ void *cmd;
+ struct list_head flist;
+};
+
+#define SKD_WRITEL(DEV, VAL, OFF) skd_reg_write32(DEV, VAL, OFF)
+#define SKD_READL(DEV, OFF) skd_reg_read32(DEV, OFF)
+#define SKD_WRITEQ(DEV, VAL, OFF) skd_reg_write64(DEV, VAL, OFF)
+
+static inline u32 skd_reg_read32(struct skd_device *skdev, u32 offset)
+{
+ u32 val;
+
+ if (likely(skdev->dbg_level < 2))
+ return readl(skdev->mem_map[1] + offset);
+ else {
+ barrier();
+ val = readl(skdev->mem_map[1] + offset);
+ barrier();
+ VPRINTK(skdev, "offset %x = %x\n", offset, val);
+ return val;
+ }
+
+}
+
+static inline void skd_reg_write32(struct skd_device *skdev, u32 val,
+ u32 offset)
+{
+ if (likely(skdev->dbg_level < 2)) {
+ writel(val, skdev->mem_map[1] + offset);
+ barrier();
+ } else {
+ barrier();
+ writel(val, skdev->mem_map[1] + offset);
+ barrier();
+ VPRINTK(skdev, "offset %x = %x\n", offset, val);
+ }
+}
+
+static inline void skd_reg_write64(struct skd_device *skdev, u64 val,
+ u32 offset)
+{
+ if (likely(skdev->dbg_level < 2)) {
+ writeq(val, skdev->mem_map[1] + offset);
+ barrier();
+ } else {
+ barrier();
+ writeq(val, skdev->mem_map[1] + offset);
+ barrier();
+ VPRINTK(skdev, "offset %x = %016llx\n", offset, val);
+ }
+}
+
+
+#define SKD_IRQ_DEFAULT SKD_IRQ_MSI
+static int skd_isr_type = SKD_IRQ_DEFAULT;
+
+module_param(skd_isr_type, int, 0444);
+MODULE_PARM_DESC(skd_isr_type, "Interrupt type capability."
+ " (0==legacy, 1==MSI, 2==MSI-X, default==1)");
+
+#define SKD_MAX_REQ_PER_MSG_DEFAULT 1
+static int skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
+
+module_param(skd_max_req_per_msg, int, 0444);
+MODULE_PARM_DESC(skd_max_req_per_msg,
+ "Maximum SCSI requests packed in a single message."
+ " (1-14, default==1)");
+
+#define SKD_MAX_QUEUE_DEPTH_DEFAULT 64
+#define SKD_MAX_QUEUE_DEPTH_DEFAULT_STR "64"
+static int skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
+
+module_param(skd_max_queue_depth, int, 0444);
+MODULE_PARM_DESC(skd_max_queue_depth,
+ "Maximum SCSI requests issued to s1120."
+ " (1-200, default==" SKD_MAX_QUEUE_DEPTH_DEFAULT_STR ")");
+
+static int skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
+module_param(skd_sgs_per_request, int, 0444);
+MODULE_PARM_DESC(skd_sgs_per_request,
+ "Maximum SG elements per block request."
+ " (1-4096, default==256)");
+
+static int skd_max_pass_thru = SKD_N_SPECIAL_CONTEXT;
+module_param(skd_max_pass_thru, int, 0444);
+MODULE_PARM_DESC(skd_max_pass_thru,
+ "Maximum SCSI pass-thru at a time." " (1-50, default==32)");
+
+module_param(skd_dbg_level, int, 0444);
+MODULE_PARM_DESC(skd_dbg_level, "s1120 debug level (0,1,2)");
+
+module_param(skd_isr_comp_limit, int, 0444);
+MODULE_PARM_DESC(skd_isr_comp_limit, "s1120 isr comp limit (0=none) default=4");
+
+static int skd_bio;
+module_param(skd_bio, int, 0444);
+MODULE_PARM_DESC(skd_bio,
+ "Register as a bio device instead of block (0, 1) default=0");
+
+/* Major device number dynamically assigned. */
+static u32 skd_major;
+
+static struct skd_device *skd_construct(struct pci_dev *pdev);
+static void skd_destruct(struct skd_device *skdev);
+static const struct block_device_operations skd_blockdev_ops;
+static void skd_send_fitmsg(struct skd_device *skdev,
+ struct skd_fitmsg_context *skmsg);
+static void skd_send_special_fitmsg(struct skd_device *skdev,
+ struct skd_special_context *skspcl);
+static void skd_request_fn(struct request_queue *rq);
+static void skd_end_request(struct skd_device *skdev,
+ struct skd_request_context *skreq, int error);
+static int skd_preop_sg_list(struct skd_device *skdev,
+ struct skd_request_context *skreq);
+static void skd_postop_sg_list(struct skd_device *skdev,
+ struct skd_request_context *skreq);
+
+static void skd_restart_device(struct skd_device *skdev);
+static int skd_quiesce_dev(struct skd_device *skdev);
+static int skd_unquiesce_dev(struct skd_device *skdev);
+static void skd_release_special(struct skd_device *skdev,
+ struct skd_special_context *skspcl);
+static void skd_disable_interrupts(struct skd_device *skdev);
+static void skd_isr_fwstate(struct skd_device *skdev);
+static void skd_recover_requests(struct skd_device *skdev, int requeue);
+static void skd_soft_reset(struct skd_device *skdev);
+
+static const char *skd_name(struct skd_device *skdev);
+const char *skd_drive_state_to_str(int state);
+const char *skd_skdev_state_to_str(enum skd_drvr_state state);
+static void skd_log_skdev(struct skd_device *skdev, const char *event);
+static void skd_log_skmsg(struct skd_device *skdev,
+ struct skd_fitmsg_context *skmsg, const char *event);
+static void skd_log_skreq(struct skd_device *skdev,
+ struct skd_request_context *skreq, const char *event);
+
+/* FLUSH FUA flag handling. */
+static int skd_flush_cmd_enqueue(struct skd_device *, void *);
+static void *skd_flush_cmd_dequeue(struct skd_device *);
+
+
+/*
+ *****************************************************************************
+ * READ/WRITE REQUESTS
+ *****************************************************************************
+ */
+static void skd_stop_queue(struct skd_device *skdev)
+{
+ if (!skd_bio)
+ blk_stop_queue(skdev->queue);
+ else
+ skdev->queue_stopped = 1;
+}
+
+static void skd_unstop_queue(struct skd_device *skdev)
+{
+ if (!skd_bio)
+ queue_flag_clear(QUEUE_FLAG_STOPPED, skdev->queue);
+ else
+ skdev->queue_stopped = 0;
+}
+
+static void skd_start_queue(struct skd_device *skdev)
+{
+ if (!skd_bio) {
+ blk_start_queue(skdev->queue);
+ } else {
+ pr_err("(%s): Starting queue\n", skd_name(skdev));
+ skdev->queue_stopped = 0;
+ skd_request_fn(skdev->queue);
+ }
+}
+
+static int skd_queue_stopped(struct skd_device *skdev)
+{
+ if (!skd_bio)
+ return blk_queue_stopped(skdev->queue);
+ else
+ return skdev->queue_stopped;
+}
+
+static void skd_fail_all_pending_blk(struct skd_device *skdev)
+{
+ struct request_queue *q = skdev->queue;
+ struct request *req;
+
+ for (;; ) {
+ req = blk_peek_request(q);
+ if (req == NULL)
+ break;
+ blk_start_request(req);
+ __blk_end_request_all(req, -EIO);
+ }
+}
+
+static void skd_fail_all_pending_bio(struct skd_device *skdev)
+{
+ struct bio *bio;
+ int error = -EIO;
+
+ for (;; ) {
+ bio = bio_list_pop(&skdev->bio_queue);
+
+ if (bio == NULL)
+ break;
+
+ bio_endio(bio, error);
+ }
+}
+
+static void skd_fail_all_pending(struct skd_device *skdev)
+{
+ if (!skd_bio)
+ skd_fail_all_pending_blk(skdev);
+ else
+ skd_fail_all_pending_bio(skdev);
+}
+
+static void skd_make_request(struct request_queue *q, struct bio *bio)
+{
+ struct skd_device *skdev = q->queuedata;
+ unsigned long flags;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+
+ bio_list_add(&skdev->bio_queue, bio);
+ skd_request_fn(skdev->queue);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+}
+
+static void
+skd_prep_rw_cdb(struct skd_scsi_request *scsi_req,
+ int data_dir, unsigned lba,
+ unsigned count)
+{
+ if (data_dir == READ)
+ scsi_req->cdb[0] = 0x28;
+ else
+ scsi_req->cdb[0] = 0x2a;
+
+ scsi_req->cdb[1] = 0;
+ scsi_req->cdb[2] = (lba & 0xff000000) >> 24;
+ scsi_req->cdb[3] = (lba & 0xff0000) >> 16;
+ scsi_req->cdb[4] = (lba & 0xff00) >> 8;
+ scsi_req->cdb[5] = (lba & 0xff);
+ scsi_req->cdb[6] = 0;
+ scsi_req->cdb[7] = (count & 0xff00) >> 8;
+ scsi_req->cdb[8] = count & 0xff;
+ scsi_req->cdb[9] = 0;
+}
+
+static void
+skd_prep_zerosize_flush_cdb(struct skd_scsi_request *scsi_req,
+ struct skd_request_context *skreq)
+{
+ skreq->flush_cmd = 1;
+
+ scsi_req->cdb[0] = 0x35;
+ scsi_req->cdb[1] = 0;
+ scsi_req->cdb[2] = 0;
+ scsi_req->cdb[3] = 0;
+ scsi_req->cdb[4] = 0;
+ scsi_req->cdb[5] = 0;
+ scsi_req->cdb[6] = 0;
+ scsi_req->cdb[7] = 0;
+ scsi_req->cdb[8] = 0;
+ scsi_req->cdb[9] = 0;
+}
+
+static void
+skd_prep_discard_cdb(struct skd_scsi_request *scsi_req,
+ struct skd_request_context *skreq,
+ struct page *page,
+ u32 lba, u32 count)
+{
+ char *buf;
+ unsigned long len;
+ struct request *req;
+
+ buf = page_address(page);
+ len = SKD_DISCARD_CDB_LENGTH;
+
+ scsi_req->cdb[0] = UNMAP;
+ scsi_req->cdb[8] = len;
+
+ put_unaligned_be16(6 + 16, &buf[0]);
+ put_unaligned_be16(16, &buf[2]);
+ put_unaligned_be64(lba, &buf[8]);
+ put_unaligned_be32(count, &buf[16]);
+
+ if (!skd_bio) {
+ req = skreq->req;
+ blk_add_request_payload(req, page, len);
+ req->buffer = buf;
+ } else {
+ skreq->bio->bi_io_vec->bv_page = page;
+ skreq->bio->bi_io_vec->bv_offset = 0;
+ skreq->bio->bi_io_vec->bv_len = len;
+
+ skreq->bio->bi_vcnt = 1;
+ skreq->bio->bi_phys_segments = 1;
+ }
+}
+
+static void skd_request_fn_not_online(struct request_queue *q);
+
+static void skd_request_fn(struct request_queue *q)
+{
+ struct skd_device *skdev = q->queuedata;
+ struct skd_fitmsg_context *skmsg = NULL;
+ struct fit_msg_hdr *fmh = NULL;
+ struct skd_request_context *skreq;
+ struct request *req = NULL;
+ struct bio *bio = NULL;
+ struct skd_scsi_request *scsi_req;
+ struct page *page;
+ unsigned long io_flags;
+ int error;
+ u32 lba;
+ u32 count;
+ int data_dir;
+ u32 be_lba;
+ u32 be_count;
+ u64 be_dmaa;
+ u64 cmdctxt;
+ u32 timo_slot;
+ void *cmd_ptr;
+ int flush, fua;
+
+ if (skdev->state != SKD_DRVR_STATE_ONLINE) {
+ skd_request_fn_not_online(q);
+ return;
+ }
+
+ if (skd_queue_stopped(skdev)) {
+ if (skdev->skmsg_free_list == NULL ||
+ skdev->skreq_free_list == NULL ||
+ skdev->in_flight >= skdev->queue_low_water_mark)
+ /* There is still some kind of shortage */
+ return;
+
+ skd_unstop_queue(skdev);
+ }
+
+ /*
+ * Stop conditions:
+ * - There are no more native requests
+ * - There are already the maximum number of requests in progress
+ * - There are no more skd_request_context entries
+ * - There are no more FIT msg buffers
+ */
+ for (;; ) {
+
+ flush = fua = 0;
+
+ if (!skd_bio) {
+ req = blk_peek_request(q);
+
+ /* Are there any native requests to start? */
+ if (req == NULL)
+ break;
+
+ lba = (u32)blk_rq_pos(req);
+ count = blk_rq_sectors(req);
+ data_dir = rq_data_dir(req);
+ io_flags = req->cmd_flags;
+
+ if (io_flags & REQ_FLUSH)
+ flush++;
+
+ if (io_flags & REQ_FUA)
+ fua++;
+
+ VPRINTK(skdev,
+ "new req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
+ req, lba, lba, count, count, data_dir);
+ } else {
+ if (!list_empty(&skdev->flush_list)) {
+ /* Process data part of FLUSH request. */
+ bio = (struct bio *)skd_flush_cmd_dequeue(skdev);
+ flush++;
+ VPRINTK(skdev, "processing FLUSH request with data.\n");
+ } else {
+ /* peek at our bio queue */
+ bio = bio_list_peek(&skdev->bio_queue);
+ }
+
+ /* Are there any native requests to start? */
+ if (bio == NULL)
+ break;
+
+ lba = (u32)bio->bi_sector;
+ count = bio_sectors(bio);
+ data_dir = bio_data_dir(bio);
+ io_flags = bio->bi_rw;
+
+ VPRINTK(skdev,
+ "new bio=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
+ bio, lba, lba, count, count, data_dir);
+
+ if (io_flags & REQ_FLUSH)
+ flush++;
+
+ if (io_flags & REQ_FUA)
+ fua++;
+ }
+
+ /* At this point we know there is a request
+ * (from our bio q or req q depending on the way
+ * the driver is built do checks for resources.
+ */
+
+ /* Are too many requets already in progress? */
+ if (skdev->in_flight >= skdev->cur_max_queue_depth) {
+ VPRINTK(skdev, "qdepth %d, limit %d\n",
+ skdev->in_flight, skdev->cur_max_queue_depth);
+ break;
+ }
+
+ /* Is a skd_request_context available? */
+ skreq = skdev->skreq_free_list;
+ if (skreq == NULL) {
+ VPRINTK(skdev, "Out of req=%p\n", q);
+ break;
+ }
+ SKD_ASSERT(skreq->state == SKD_REQ_STATE_IDLE);
+ SKD_ASSERT((skreq->id & SKD_ID_INCR) == 0);
+
+ /* Now we check to see if we can get a fit msg */
+ if (skmsg == NULL) {
+ if (skdev->skmsg_free_list == NULL) {
+ VPRINTK(skdev, "Out of msg\n");
+ break;
+ }
+ }
+
+ skreq->flush_cmd = 0;
+ skreq->n_sg = 0;
+ skreq->sg_byte_count = 0;
+ skreq->discard_page = 0;
+
+ /*
+ * OK to now dequeue request from either bio or q.
+ *
+ * At this point we are comitted to either start or reject
+ * the native request. Note that skd_request_context is
+ * available but is still at the head of the free list.
+ */
+ if (!skd_bio) {
+ blk_start_request(req);
+ skreq->req = req;
+ skreq->fitmsg_id = 0;
+ } else {
+ if (unlikely(flush == SKD_FLUSH_DATA_SECOND)) {
+ skreq->bio = bio;
+ } else {
+ skreq->bio = bio_list_pop(&skdev->bio_queue);
+ SKD_ASSERT(skreq->bio == bio);
+ skreq->start_time = jiffies;
+ part_inc_in_flight(&skdev->disk->part0,
+ bio_data_dir(bio));
+ }
+
+ skreq->fitmsg_id = 0;
+ }
+
+ /* Either a FIT msg is in progress or we have to start one. */
+ if (skmsg == NULL) {
+ /* Are there any FIT msg buffers available? */
+ skmsg = skdev->skmsg_free_list;
+ if (skmsg == NULL) {
+ VPRINTK(skdev, "Out of msg skdev=%p\n", skdev);
+ break;
+ }
+ SKD_ASSERT(skmsg->state == SKD_MSG_STATE_IDLE);
+ SKD_ASSERT((skmsg->id & SKD_ID_INCR) == 0);
+
+ skdev->skmsg_free_list = skmsg->next;
+
+ skmsg->state = SKD_MSG_STATE_BUSY;
+ skmsg->id += SKD_ID_INCR;
+
+ /* Initialize the FIT msg header */
+ fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
+ memset(fmh, 0, sizeof(*fmh));
+ fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
+ skmsg->length = sizeof(*fmh);
+ }
+
+ skreq->fitmsg_id = skmsg->id;
+
+ /*
+ * Note that a FIT msg may have just been started
+ * but contains no SoFIT requests yet.
+ */
+
+ /*
+ * Transcode the request, checking as we go. The outcome of
+ * the transcoding is represented by the error variable.
+ */
+ cmd_ptr = &skmsg->msg_buf[skmsg->length];
+ memset(cmd_ptr, 0, 32);
+
+ be_lba = cpu_to_be32(lba);
+ be_count = cpu_to_be32(count);
+ be_dmaa = cpu_to_be64((u64)skreq->sksg_dma_address);
+ cmdctxt = skreq->id + SKD_ID_INCR;
+
+ scsi_req = cmd_ptr;
+ scsi_req->hdr.tag = cmdctxt;
+ scsi_req->hdr.sg_list_dma_address = be_dmaa;
+
+ if (data_dir == READ)
+ skreq->sg_data_dir = SKD_DATA_DIR_CARD_TO_HOST;
+ else
+ skreq->sg_data_dir = SKD_DATA_DIR_HOST_TO_CARD;
+
+ if (io_flags & REQ_DISCARD) {
+ page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
+ if (!page) {
+ pr_err("request_fn:Page allocation failed.\n");
+ skd_end_request(skdev, skreq, -ENOMEM);
+ break;
+ }
+ skreq->discard_page = 1;
+ skd_prep_discard_cdb(scsi_req, skreq, page, lba, count);
+
+ } else if (flush == SKD_FLUSH_ZERO_SIZE_FIRST) {
+ skd_prep_zerosize_flush_cdb(scsi_req, skreq);
+ SKD_ASSERT(skreq->flush_cmd == 1);
+
+ } else {
+ skd_prep_rw_cdb(scsi_req, data_dir, lba, count);
+ }
+
+ if (fua)
+ scsi_req->cdb[1] |= SKD_FUA_NV;
+
+ if ((!skd_bio && !req->bio) ||
+ (skd_bio && flush == SKD_FLUSH_ZERO_SIZE_FIRST))
+ goto skip_sg;
+
+ error = skd_preop_sg_list(skdev, skreq);
+
+ if (error != 0) {
+ /*
+ * Complete the native request with error.
+ * Note that the request context is still at the
+ * head of the free list, and that the SoFIT request
+ * was encoded into the FIT msg buffer but the FIT
+ * msg length has not been updated. In short, the
+ * only resource that has been allocated but might
+ * not be used is that the FIT msg could be empty.
+ */
+ DPRINTK(skdev, "error Out\n");
+ skd_end_request(skdev, skreq, error);
+ continue;
+ }
+
+skip_sg:
+ scsi_req->hdr.sg_list_len_bytes =
+ cpu_to_be32(skreq->sg_byte_count);
+
+ /* Complete resource allocations. */
+ skdev->skreq_free_list = skreq->next;
+ skreq->state = SKD_REQ_STATE_BUSY;
+ skreq->id += SKD_ID_INCR;
+
+ skmsg->length += sizeof(struct skd_scsi_request);
+ fmh->num_protocol_cmds_coalesced++;
+
+ /*
+ * Update the active request counts.
+ * Capture the timeout timestamp.
+ */
+ skreq->timeout_stamp = skdev->timeout_stamp;
+ timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
+ skdev->timeout_slot[timo_slot]++;
+ skdev->in_flight++;
+ VPRINTK(skdev, "req=0x%x busy=%d\n",
+ skreq->id, skdev->in_flight);
+
+ /*
+ * If the FIT msg buffer is full send it.
+ */
+ if (skmsg->length >= SKD_N_FITMSG_BYTES ||
+ fmh->num_protocol_cmds_coalesced >= skd_max_req_per_msg) {
+ skd_send_fitmsg(skdev, skmsg);
+ skmsg = NULL;
+ fmh = NULL;
+ }
+ }
+
+ /*
+ * Is a FIT msg in progress? If it is empty put the buffer back
+ * on the free list. If it is non-empty send what we got.
+ * This minimizes latency when there are fewer requests than
+ * what fits in a FIT msg.
+ */
+ if (skmsg != NULL) {
+ /* Bigger than just a FIT msg header? */
+ if (skmsg->length > sizeof(struct fit_msg_hdr)) {
+ VPRINTK(skdev, "sending msg=%p, len %d\n",
+ skmsg, skmsg->length);
+ skd_send_fitmsg(skdev, skmsg);
+ } else {
+ /*
+ * The FIT msg is empty. It means we got started
+ * on the msg, but the requests were rejected.
+ */
+ skmsg->state = SKD_MSG_STATE_IDLE;
+ skmsg->id += SKD_ID_INCR;
+ skmsg->next = skdev->skmsg_free_list;
+ skdev->skmsg_free_list = skmsg;
+ }
+ skmsg = NULL;
+ fmh = NULL;
+ }
+
+ /*
+ * If req is non-NULL it means there is something to do but
+ * we are out of a resource.
+ */
+ if (((!skd_bio) && req) ||
+ ((skd_bio) && bio_list_peek(&skdev->bio_queue)))
+ skd_stop_queue(skdev);
+}
+
+static void skd_end_request_blk(struct skd_device *skdev,
+ struct skd_request_context *skreq, int error)
+{
+ struct request *req = skreq->req;
+ unsigned int io_flags = req->cmd_flags;
+
+ if ((io_flags & REQ_DISCARD) &&
+ (skreq->discard_page == 1)) {
+ VPRINTK(skdev, "skd_end_request_blk, free the page!");
+ free_page((unsigned long)req->buffer);
+ req->buffer = NULL;
+ }
+
+ if (unlikely(error)) {
+ struct request *req = skreq->req;
+ char *cmd = (rq_data_dir(req) == READ) ? "read" : "write";
+ u32 lba = (u32)blk_rq_pos(req);
+ u32 count = blk_rq_sectors(req);
+
+ pr_err("(%s): Error cmd=%s sect=%u count=%u id=0x%x\n",
+ skd_name(skdev), cmd, lba, count, skreq->id);
+ } else
+ VPRINTK(skdev, "id=0x%x error=%d\n", skreq->id, error);
+
+ __blk_end_request_all(skreq->req, error);
+}
+
+static int skd_preop_sg_list_blk(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ struct request *req = skreq->req;
+ int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
+ int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
+ struct scatterlist *sg = &skreq->sg[0];
+ int n_sg;
+ int i;
+
+ skreq->sg_byte_count = 0;
+
+ /* SKD_ASSERT(skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD ||
+ skreq->sg_data_dir == SKD_DATA_DIR_CARD_TO_HOST); */
+
+ n_sg = blk_rq_map_sg(skdev->queue, req, sg);
+ if (n_sg <= 0)
+ return -EINVAL;
+
+ /*
+ * Map scatterlist to PCI bus addresses.
+ * Note PCI might change the number of entries.
+ */
+ n_sg = pci_map_sg(skdev->pdev, sg, n_sg, pci_dir);
+ if (n_sg <= 0)
+ return -EINVAL;
+
+ SKD_ASSERT(n_sg <= skdev->sgs_per_request);
+
+ skreq->n_sg = n_sg;
+
+ for (i = 0; i < n_sg; i++) {
+ struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
+ u32 cnt = sg_dma_len(&sg[i]);
+ uint64_t dma_addr = sg_dma_address(&sg[i]);
+
+ sgd->control = FIT_SGD_CONTROL_NOT_LAST;
+ sgd->byte_count = cnt;
+ skreq->sg_byte_count += cnt;
+ sgd->host_side_addr = dma_addr;
+ sgd->dev_side_addr = 0;
+ }
+
+ skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL;
+ skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST;
+
+ if (unlikely(skdev->dbg_level > 1)) {
+ VPRINTK(skdev, "skreq=%x sksg_list=%p sksg_dma=%llx\n",
+ skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
+ for (i = 0; i < n_sg; i++) {
+ struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
+ VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
+ "addr=0x%llx next=0x%llx\n",
+ i, sgd->byte_count, sgd->control,
+ sgd->host_side_addr, sgd->next_desc_ptr);
+ }
+ }
+
+ return 0;
+}
+
+static void skd_postop_sg_list_blk(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
+ int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
+
+ /*
+ * restore the next ptr for next IO request so we
+ * don't have to set it every time.
+ */
+ skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
+ skreq->sksg_dma_address +
+ ((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
+ pci_unmap_sg(skdev->pdev, &skreq->sg[0], skreq->n_sg, pci_dir);
+}
+
+static void skd_end_request_bio(struct skd_device *skdev,
+ struct skd_request_context *skreq, int error)
+{
+ struct bio *bio = skreq->bio;
+ int rw = bio_data_dir(bio);
+ unsigned long io_flags = bio->bi_rw;
+
+ if ((io_flags & REQ_DISCARD) &&
+ (skreq->discard_page == 1)) {
+ VPRINTK(skdev, "biomode: skd_end_request: freeing DISCARD page.\n");
+ free_page((unsigned long)page_address(bio->bi_io_vec->bv_page));
+ }
+
+ if (unlikely(error)) {
+ u32 lba = (u32)skreq->bio->bi_sector;
+ u32 count = bio_sectors(skreq->bio);
+ char *cmd = (rw == WRITE) ? "write" : "read";
+ pr_err("(%s): Error cmd=%s sect=%u count=%u id=0x%x\n",
+ skd_name(skdev), cmd, lba, count, skreq->id);
+ }
+ {
+ int cpu = part_stat_lock();
+
+ if (likely(!error)) {
+ part_stat_inc(cpu, &skdev->disk->part0, ios[rw]);
+ part_stat_add(cpu, &skdev->disk->part0, sectors[rw],
+ bio_sectors(bio));
+ }
+ part_stat_add(cpu, &skdev->disk->part0, ticks[rw],
+ jiffies - skreq->start_time);
+ part_dec_in_flight(&skdev->disk->part0, rw);
+ part_stat_unlock();
+ }
+
+ VPRINTK(skdev, "id=0x%x error=%d\n", skreq->id, error);
+
+ bio_endio(skreq->bio, error);
+}
+
+static int skd_preop_sg_list_bio(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ struct bio *bio = skreq->bio;
+ int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
+ int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
+ int n_sg;
+ int i;
+ struct bio_vec *vec;
+ struct fit_sg_descriptor *sgd;
+ u64 dma_addr;
+ u32 count;
+ int errs = 0;
+ unsigned int io_flags = 0;
+ io_flags |= bio->bi_rw;
+
+ skreq->sg_byte_count = 0;
+ n_sg = skreq->n_sg = skreq->bio->bi_vcnt;
+
+ if (n_sg <= 0)
+ return -EINVAL;
+
+ if (n_sg > skdev->sgs_per_request) {
+ pr_err("(%s): sg overflow n=%d\n",
+ skd_name(skdev), n_sg);
+ skreq->n_sg = 0;
+ return -EIO;
+ }
+
+ for (i = 0; i < skreq->n_sg; i++) {
+ vec = bio_iovec_idx(bio, i);
+ dma_addr = pci_map_page(skdev->pdev,
+ vec->bv_page,
+ vec->bv_offset, vec->bv_len, pci_dir);
+ count = vec->bv_len;
+
+ if (count == 0 || count > 64u * 1024u || (count & 3) != 0
+ || (dma_addr & 3) != 0) {
+ pr_err(
+ "(%s): Bad sg ix=%d count=%d addr=0x%llx\n",
+ skd_name(skdev), i, count, dma_addr);
+ errs++;
+ }
+
+ sgd = &skreq->sksg_list[i];
+
+ sgd->control = FIT_SGD_CONTROL_NOT_LAST;
+ sgd->byte_count = vec->bv_len;
+ skreq->sg_byte_count += vec->bv_len;
+ sgd->host_side_addr = dma_addr;
+ sgd->dev_side_addr = 0; /* not used */
+ }
+
+ skreq->sksg_list[n_sg - 1].next_desc_ptr = 0LL;
+ skreq->sksg_list[n_sg - 1].control = FIT_SGD_CONTROL_LAST;
+
+
+ if (!(io_flags & REQ_DISCARD)) {
+ count = bio_sectors(bio) << 9u;
+ if (count != skreq->sg_byte_count) {
+ pr_err("(%s): mismatch count sg=%d req=%d\n",
+ skd_name(skdev), skreq->sg_byte_count, count);
+ errs++;
+ }
+ }
+
+ if (unlikely(skdev->dbg_level > 1)) {
+ VPRINTK(skdev, "skreq=%x sksg_list=%p sksg_dma=%llx\n",
+ skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
+ for (i = 0; i < n_sg; i++) {
+ struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
+ VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
+ "addr=0x%llx next=0x%llx\n",
+ i, sgd->byte_count, sgd->control,
+ sgd->host_side_addr, sgd->next_desc_ptr);
+ }
+ }
+
+ if (errs != 0) {
+ skd_postop_sg_list(skdev, skreq);
+ skreq->n_sg = 0;
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int skd_preop_sg_list(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ if (!skd_bio)
+ return skd_preop_sg_list_blk(skdev, skreq);
+ else
+ return skd_preop_sg_list_bio(skdev, skreq);
+}
+
+static void skd_postop_sg_list_bio(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ int writing = skreq->sg_data_dir == SKD_DATA_DIR_HOST_TO_CARD;
+ int pci_dir = writing ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE;
+ int i;
+ struct fit_sg_descriptor *sgd;
+
+ /*
+ * restore the next ptr for next IO request so we
+ * don't have to set it every time.
+ */
+ skreq->sksg_list[skreq->n_sg - 1].next_desc_ptr =
+ skreq->sksg_dma_address +
+ ((skreq->n_sg) * sizeof(struct fit_sg_descriptor));
+
+ for (i = 0; i < skreq->n_sg; i++) {
+ sgd = &skreq->sksg_list[i];
+ pci_unmap_page(skdev->pdev, sgd->host_side_addr,
+ sgd->byte_count, pci_dir);
+ }
+}
+
+static void skd_postop_sg_list(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ if (!skd_bio)
+ skd_postop_sg_list_blk(skdev, skreq);
+ else
+ skd_postop_sg_list_bio(skdev, skreq);
+}
+
+static void skd_end_request(struct skd_device *skdev,
+ struct skd_request_context *skreq, int error)
+{
+ if (likely(!skd_bio))
+ skd_end_request_blk(skdev, skreq, error);
+ else
+ skd_end_request_bio(skdev, skreq, error);
+}
+
+static void skd_request_fn_not_online(struct request_queue *q)
+{
+ struct skd_device *skdev = q->queuedata;
+ int error;
+
+ SKD_ASSERT(skdev->state != SKD_DRVR_STATE_ONLINE);
+
+ skd_log_skdev(skdev, "req_not_online");
+ switch (skdev->state) {
+ case SKD_DRVR_STATE_PAUSING:
+ case SKD_DRVR_STATE_PAUSED:
+ case SKD_DRVR_STATE_STARTING:
+ case SKD_DRVR_STATE_RESTARTING:
+ case SKD_DRVR_STATE_WAIT_BOOT:
+ /* In case of starting, we haven't started the queue,
+ * so we can't get here... but requests are
+ * possibly hanging out waiting for us because we
+ * reported the dev/skd0 already. They'll wait
+ * forever if connect doesn't complete.
+ * What to do??? delay dev/skd0 ??
+ */
+ case SKD_DRVR_STATE_BUSY:
+ case SKD_DRVR_STATE_BUSY_IMMINENT:
+ case SKD_DRVR_STATE_BUSY_ERASE:
+ case SKD_DRVR_STATE_DRAINING_TIMEOUT:
+ return;
+
+ case SKD_DRVR_STATE_BUSY_SANITIZE:
+ case SKD_DRVR_STATE_STOPPING:
+ case SKD_DRVR_STATE_SYNCING:
+ case SKD_DRVR_STATE_FAULT:
+ case SKD_DRVR_STATE_DISAPPEARED:
+ default:
+ error = -EIO;
+ break;
+ }
+
+ /* If we get here, terminate all pending block requeusts
+ * with EIO and any scsi pass thru with appropriate sense
+ */
+
+ skd_fail_all_pending(skdev);
+}
+
+/*
+ *****************************************************************************
+ * TIMER
+ *****************************************************************************
+ */
+
+static void skd_timer_tick_not_online(struct skd_device *skdev);
+
+static void skd_timer_tick(ulong arg)
+{
+ struct skd_device *skdev = (struct skd_device *)arg;
+
+ u32 timo_slot;
+ u32 overdue_timestamp;
+ unsigned long reqflags;
+ u32 state;
+
+ if (skdev->state == SKD_DRVR_STATE_FAULT)
+ /* The driver has declared fault, and we want it to
+ * stay that way until driver is reloaded.
+ */
+ return;
+
+ spin_lock_irqsave(&skdev->lock, reqflags);
+
+ state = SKD_READL(skdev, FIT_STATUS);
+ state &= FIT_SR_DRIVE_STATE_MASK;
+ if (state != skdev->drive_state)
+ skd_isr_fwstate(skdev);
+
+ if (skdev->state != SKD_DRVR_STATE_ONLINE) {
+ skd_timer_tick_not_online(skdev);
+ goto timer_func_out;
+ }
+ skdev->timeout_stamp++;
+ timo_slot = skdev->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
+
+ /*
+ * All requests that happened during the previous use of
+ * this slot should be done by now. The previous use was
+ * over 7 seconds ago.
+ */
+ if (skdev->timeout_slot[timo_slot] == 0)
+ goto timer_func_out;
+
+ /* Something is overdue */
+ overdue_timestamp = skdev->timeout_stamp - SKD_N_TIMEOUT_SLOT;
+
+ DPRINTK(skdev, "found %d timeouts, draining busy=%d\n",
+ skdev->timeout_slot[timo_slot], skdev->in_flight);
+ pr_err("(%s): Overdue IOs (%d), busy %d\n",
+ skd_name(skdev), skdev->timeout_slot[timo_slot],
+ skdev->in_flight);
+
+ skdev->timer_countdown = SKD_DRAINING_TIMO;
+ skdev->state = SKD_DRVR_STATE_DRAINING_TIMEOUT;
+ skdev->timo_slot = timo_slot;
+ skd_stop_queue(skdev);
+
+timer_func_out:
+ mod_timer(&skdev->timer, (jiffies + HZ));
+
+ spin_unlock_irqrestore(&skdev->lock, reqflags);
+}
+
+static void skd_timer_tick_not_online(struct skd_device *skdev)
+{
+ switch (skdev->state) {
+ case SKD_DRVR_STATE_IDLE:
+ case SKD_DRVR_STATE_LOAD:
+ break;
+ case SKD_DRVR_STATE_BUSY_SANITIZE:
+ VPRINTK(skdev, "drive busy sanitize[%x], driver[%x]\n",
+ skdev->drive_state, skdev->state);
+ /* If we've been in sanitize for 3 seconds, we figure we're not
+ * going to get anymore completions, so recover requests now
+ */
+ if (skdev->timer_countdown > 0) {
+ skdev->timer_countdown--;
+ return;
+ }
+ skd_recover_requests(skdev, 0);
+ break;
+
+ case SKD_DRVR_STATE_BUSY:
+ case SKD_DRVR_STATE_BUSY_IMMINENT:
+ case SKD_DRVR_STATE_BUSY_ERASE:
+ VPRINTK(skdev, "busy[%x], countdown=%d\n",
+ skdev->state, skdev->timer_countdown);
+ if (skdev->timer_countdown > 0) {
+ skdev->timer_countdown--;
+ return;
+ }
+ DPRINTK(skdev, "busy[%x], timedout=%d, restarting device.",
+ skdev->state, skdev->timer_countdown);
+ skd_restart_device(skdev);
+ break;
+
+ case SKD_DRVR_STATE_WAIT_BOOT:
+ case SKD_DRVR_STATE_STARTING:
+ if (skdev->timer_countdown > 0) {
+ skdev->timer_countdown--;
+ return;
+ }
+ /* For now, we fault the drive. Could attempt resets to
+ * revcover at some point. */
+ skdev->state = SKD_DRVR_STATE_FAULT;
+
+ pr_err("(%s): DriveFault Connect Timeout (%x)\n",
+ skd_name(skdev), skdev->drive_state);
+
+ /*start the queue so we can respond with error to requests */
+ /* wakeup anyone waiting for startup complete */
+ skd_start_queue(skdev);
+ skdev->gendisk_on = -1;
+ wake_up_interruptible(&skdev->waitq);
+ break;
+
+ case SKD_DRVR_STATE_ONLINE:
+ /* shouldn't get here. */
+ break;
+
+ case SKD_DRVR_STATE_PAUSING:
+ case SKD_DRVR_STATE_PAUSED:
+ break;
+
+ case SKD_DRVR_STATE_DRAINING_TIMEOUT:
+ DPRINTK(skdev,
+ "draining busy [%d] tick[%d] qdb[%d] tmls[%d]\n",
+ skdev->timo_slot,
+ skdev->timer_countdown,
+ skdev->in_flight,
+ skdev->timeout_slot[skdev->timo_slot]);
+ /* if the slot has cleared we can let the I/O continue */
+ if (skdev->timeout_slot[skdev->timo_slot] == 0) {
+ DPRINTK(skdev, "Slot drained, starting queue.\n");
+ skdev->state = SKD_DRVR_STATE_ONLINE;
+ skd_start_queue(skdev);
+ return;
+ }
+ if (skdev->timer_countdown > 0) {
+ skdev->timer_countdown--;
+ return;
+ }
+ skd_restart_device(skdev);
+ break;
+
+ case SKD_DRVR_STATE_RESTARTING:
+ if (skdev->timer_countdown > 0) {
+ skdev->timer_countdown--;
+ return;
+ }
+ /* For now, we fault the drive. Could attempt resets to
+ * revcover at some point. */
+ skdev->state = SKD_DRVR_STATE_FAULT;
+ pr_err("(%s): DriveFault Reconnect Timeout (%x)\n",
+ skd_name(skdev), skdev->drive_state);
+
+ /*
+ * Recovering does two things:
+ * 1. completes IO with error
+ * 2. reclaims dma resources
+ * When is it safe to recover requests?
+ * - if the drive state is faulted
+ * - if the state is still soft reset after out timeout
+ * - if the drive registers are dead (state = FF)
+ * If it is "unsafe", we still need to recover, so we will
+ * disable pci bus mastering and disable our interrupts.
+ */
+
+ if ((skdev->drive_state == FIT_SR_DRIVE_SOFT_RESET) ||
+ (skdev->drive_state == FIT_SR_DRIVE_FAULT) ||
+ (skdev->drive_state == FIT_SR_DRIVE_STATE_MASK))
+ /* It never came out of soft reset. Try to
+ * recover the requests and then let them
+ * fail. This is to mitigate hung processes. */
+ skd_recover_requests(skdev, 0);
+ else {
+ pr_err("(%s): Disable BusMaster (%x)\n",
+ skd_name(skdev), skdev->drive_state);
+ pci_disable_device(skdev->pdev);
+ skd_disable_interrupts(skdev);
+ skd_recover_requests(skdev, 0);
+ }
+
+ /*start the queue so we can respond with error to requests */
+ /* wakeup anyone waiting for startup complete */
+ skd_start_queue(skdev);
+ skdev->gendisk_on = -1;
+ wake_up_interruptible(&skdev->waitq);
+ break;
+
+ case SKD_DRVR_STATE_RESUMING:
+ case SKD_DRVR_STATE_STOPPING:
+ case SKD_DRVR_STATE_SYNCING:
+ case SKD_DRVR_STATE_FAULT:
+ case SKD_DRVR_STATE_DISAPPEARED:
+ default:
+ break;
+ }
+}
+
+static int skd_start_timer(struct skd_device *skdev)
+{
+ int rc;
+
+ init_timer(&skdev->timer);
+ setup_timer(&skdev->timer, skd_timer_tick, (ulong)skdev);
+
+ rc = mod_timer(&skdev->timer, (jiffies + HZ));
+ if (rc)
+ pr_err("%s: failed to start timer %d\n",
+ __func__, rc);
+ return rc;
+}
+
+static void skd_kill_timer(struct skd_device *skdev)
+{
+ del_timer_sync(&skdev->timer);
+}
+
+/*
+ *****************************************************************************
+ * IOCTL
+ *****************************************************************************
+ */
+static int skd_ioctl_sg_io(struct skd_device *skdev,
+ fmode_t mode, void __user *argp);
+static int skd_sg_io_get_and_check_args(struct skd_device *skdev,
+ struct skd_sg_io *sksgio);
+static int skd_sg_io_obtain_skspcl(struct skd_device *skdev,
+ struct skd_sg_io *sksgio);
+static int skd_sg_io_prep_buffering(struct skd_device *skdev,
+ struct skd_sg_io *sksgio);
+static int skd_sg_io_copy_buffer(struct skd_device *skdev,
+ struct skd_sg_io *sksgio, int dxfer_dir);
+static int skd_sg_io_send_fitmsg(struct skd_device *skdev,
+ struct skd_sg_io *sksgio);
+static int skd_sg_io_await(struct skd_device *skdev, struct skd_sg_io *sksgio);
+static int skd_sg_io_release_skspcl(struct skd_device *skdev,
+ struct skd_sg_io *sksgio);
+static int skd_sg_io_put_status(struct skd_device *skdev,
+ struct skd_sg_io *sksgio);
+
+static void skd_complete_special(struct skd_device *skdev,
+ volatile struct fit_completion_entry_v1
+ *skcomp,
+ volatile struct fit_comp_error_info *skerr,
+ struct skd_special_context *skspcl);
+
+static int skd_bdev_ioctl(struct block_device *bdev, fmode_t mode,
+ uint cmd_in, ulong arg)
+{
+ int rc = 0;
+ struct gendisk *disk = bdev->bd_disk;
+ struct skd_device *skdev = disk->private_data;
+ void __user *p = (void *)arg;
+
+ DPRINTK(skdev, "%s: CMD[%s] ioctl mode 0x%x, cmd 0x%x arg %0lx\n",
+ disk->disk_name, current->comm, mode, cmd_in, arg);
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ switch (cmd_in) {
+ case SG_SET_TIMEOUT:
+ case SG_GET_TIMEOUT:
+ case SG_GET_VERSION_NUM:
+ rc = scsi_cmd_ioctl(disk->queue, disk, mode, cmd_in, p);
+ break;
+ case SG_IO:
+ rc = skd_ioctl_sg_io(skdev, mode, p);
+ break;
+
+ default:
+ rc = -ENOTTY;
+ break;
+ }
+
+ DPRINTK(skdev, "%s: completion rc %d\n", disk->disk_name, rc);
+ return rc;
+}
+
+static int skd_ioctl_sg_io(struct skd_device *skdev, fmode_t mode,
+ void __user *argp)
+{
+ int rc;
+ struct skd_sg_io sksgio;
+
+ memset(&sksgio, 0, sizeof(sksgio));
+ sksgio.mode = mode;
+ sksgio.argp = argp;
+ sksgio.iov = &sksgio.no_iov_iov;
+
+ switch (skdev->state) {
+ case SKD_DRVR_STATE_ONLINE:
+ case SKD_DRVR_STATE_BUSY_IMMINENT:
+ break;
+
+ default:
+ DPRINTK(skdev, "drive not online\n");
+ rc = -ENXIO;
+ goto out;
+ }
+
+ rc = skd_sg_io_get_and_check_args(skdev, &sksgio);
+ if (rc)
+ goto out;
+
+ rc = skd_sg_io_obtain_skspcl(skdev, &sksgio);
+ if (rc)
+ goto out;
+
+ rc = skd_sg_io_prep_buffering(skdev, &sksgio);
+ if (rc)
+ goto out;
+
+ rc = skd_sg_io_copy_buffer(skdev, &sksgio, SG_DXFER_TO_DEV);
+ if (rc)
+ goto out;
+
+ rc = skd_sg_io_send_fitmsg(skdev, &sksgio);
+ if (rc)
+ goto out;
+
+ rc = skd_sg_io_await(skdev, &sksgio);
+ if (rc)
+ goto out;
+
+ rc = skd_sg_io_copy_buffer(skdev, &sksgio, SG_DXFER_FROM_DEV);
+ if (rc)
+ goto out;
+
+ rc = skd_sg_io_put_status(skdev, &sksgio);
+ if (rc)
+ goto out;
+
+ rc = 0;
+
+out:
+ skd_sg_io_release_skspcl(skdev, &sksgio);
+
+ if (sksgio.iov != NULL && sksgio.iov != &sksgio.no_iov_iov)
+ kfree(sksgio.iov);
+ return rc;
+}
+
+static int skd_sg_io_get_and_check_args(struct skd_device *skdev,
+ struct skd_sg_io *sksgio)
+{
+ struct sg_io_hdr *sgp = &sksgio->sg;
+ int i, acc;
+
+ if (!access_ok(VERIFY_WRITE, sksgio->argp, sizeof(sg_io_hdr_t))) {
+ DPRINTK(skdev, "access sg failed %p\n", sksgio->argp);
+ return -EFAULT;
+ }
+
+ if (__copy_from_user(sgp, sksgio->argp, sizeof(sg_io_hdr_t))) {
+ DPRINTK(skdev, "copy_from_user sg failed %p\n", sksgio->argp);
+ return -EFAULT;
+ }
+
+ if (sgp->interface_id != SG_INTERFACE_ID_ORIG) {
+ DPRINTK(skdev, "interface_id invalid 0x%x\n",
+ sgp->interface_id);
+ return -EINVAL;
+ }
+
+ if (sgp->cmd_len > sizeof(sksgio->cdb)) {
+ DPRINTK(skdev, "cmd_len invalid %d\n", sgp->cmd_len);
+ return -EINVAL;
+ }
+
+ if (sgp->iovec_count > 256) {
+ DPRINTK(skdev, "iovec_count invalid %d\n", sgp->iovec_count);
+ return -EINVAL;
+ }
+
+ if (sgp->dxfer_len > (PAGE_SIZE * SKD_N_SG_PER_SPECIAL)) {
+ DPRINTK(skdev, "dxfer_len invalid %d\n", sgp->dxfer_len);
+ return -EINVAL;
+ }
+
+ switch (sgp->dxfer_direction) {
+ case SG_DXFER_NONE:
+ acc = -1;
+ break;
+
+ case SG_DXFER_TO_DEV:
+ acc = VERIFY_READ;
+ break;
+
+ case SG_DXFER_FROM_DEV:
+ case SG_DXFER_TO_FROM_DEV:
+ acc = VERIFY_WRITE;
+ break;
+
+ default:
+ DPRINTK(skdev, "dxfer_dir invalid %d\n", sgp->dxfer_direction);
+ return -EINVAL;
+ }
+
+ if (copy_from_user(sksgio->cdb, sgp->cmdp, sgp->cmd_len)) {
+ DPRINTK(skdev, "copy_from_user cmdp failed %p\n", sgp->cmdp);
+ return -EFAULT;
+ }
+
+ if (sgp->mx_sb_len != 0) {
+ if (!access_ok(VERIFY_WRITE, sgp->sbp, sgp->mx_sb_len)) {
+ DPRINTK(skdev, "access sbp failed %p\n", sgp->sbp);
+ return -EFAULT;
+ }
+ }
+
+ if (sgp->iovec_count == 0) {
+ sksgio->iov[0].iov_base = sgp->dxferp;
+ sksgio->iov[0].iov_len = sgp->dxfer_len;
+ sksgio->iovcnt = 1;
+ sksgio->dxfer_len = sgp->dxfer_len;
+ } else {
+ struct sg_iovec *iov;
+ uint nbytes = sizeof(*iov) * sgp->iovec_count;
+ size_t iov_data_len;
+
+ iov = kmalloc(nbytes, GFP_KERNEL);
+ if (iov == NULL) {
+ DPRINTK(skdev, "alloc iovec failed %d\n",
+ sgp->iovec_count);
+ return -ENOMEM;
+ }
+ sksgio->iov = iov;
+ sksgio->iovcnt = sgp->iovec_count;
+
+ if (copy_from_user(iov, sgp->dxferp, nbytes)) {
+ DPRINTK(skdev, "copy_from_user iovec failed %p\n",
+ sgp->dxferp);
+ return -EFAULT;
+ }
+
+ /*
+ * Sum up the vecs, making sure they don't overflow
+ */
+ iov_data_len = 0;
+ for (i = 0; i < sgp->iovec_count; i++) {
+ if (iov_data_len + iov[i].iov_len < iov_data_len)
+ return -EINVAL;
+ iov_data_len += iov[i].iov_len;
+ }
+
+ /* SG_IO howto says that the shorter of the two wins */
+ if (sgp->dxfer_len < iov_data_len) {
+ sksgio->iovcnt = iov_shorten((struct iovec *)iov,
+ sgp->iovec_count,
+ sgp->dxfer_len);
+ sksgio->dxfer_len = sgp->dxfer_len;
+ } else
+ sksgio->dxfer_len = iov_data_len;
+ }
+
+ if (sgp->dxfer_direction != SG_DXFER_NONE) {
+ struct sg_iovec *iov = sksgio->iov;
+ for (i = 0; i < sksgio->iovcnt; i++, iov++) {
+ if (!access_ok(acc, iov->iov_base, iov->iov_len)) {
+ DPRINTK(skdev, "access data failed %p/%d\n",
+ iov->iov_base, (int)iov->iov_len);
+ return -EFAULT;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static int skd_sg_io_obtain_skspcl(struct skd_device *skdev,
+ struct skd_sg_io *sksgio)
+{
+ struct skd_special_context *skspcl = NULL;
+ int rc;
+
+ for (;; ) {
+ ulong flags;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ skspcl = skdev->skspcl_free_list;
+ if (skspcl != NULL) {
+ skdev->skspcl_free_list =
+ (struct skd_special_context *)skspcl->req.next;
+ skspcl->req.id += SKD_ID_INCR;
+ skspcl->req.state = SKD_REQ_STATE_SETUP;
+ skspcl->orphaned = 0;
+ skspcl->req.n_sg = 0;
+ }
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+ if (skspcl != NULL) {
+ rc = 0;
+ break;
+ }
+
+ DPRINTK(skdev, "blocking\n");
+
+ rc = wait_event_interruptible_timeout(
+ skdev->waitq,
+ (skdev->skspcl_free_list != NULL),
+ msecs_to_jiffies(sksgio->sg.timeout));
+
+ DPRINTK(skdev, "unblocking, rc=%d\n", rc);
+
+ if (rc <= 0) {
+ if (rc == 0)
+ rc = -ETIMEDOUT;
+ else
+ rc = -EINTR;
+ break;
+ }
+ /*
+ * If we get here rc > 0 meaning the timeout to
+ * wait_event_interruptible_timeout() had time left, hence the
+ * sought event -- non-empty free list -- happened.
+ * Retry the allocation.
+ */
+ }
+ sksgio->skspcl = skspcl;
+
+ return rc;
+}
+
+static int skd_skreq_prep_buffering(struct skd_device *skdev,
+ struct skd_request_context *skreq,
+ u32 dxfer_len)
+{
+ u32 resid = dxfer_len;
+
+ /*
+ * The DMA engine must have aligned addresses and byte counts.
+ */
+ resid += (-resid) & 3;
+ skreq->sg_byte_count = resid;
+
+ skreq->n_sg = 0;
+
+ while (resid > 0) {
+ u32 nbytes = PAGE_SIZE;
+ u32 ix = skreq->n_sg;
+ struct scatterlist *sg = &skreq->sg[ix];
+ struct fit_sg_descriptor *sksg = &skreq->sksg_list[ix];
+ struct page *page;
+
+ if (nbytes > resid)
+ nbytes = resid;
+
+ page = alloc_page(GFP_KERNEL);
+ if (page == NULL)
+ return -ENOMEM;
+
+ sg_set_page(sg, page, nbytes, 0);
+
+ /* TODO: This should be going through a pci_???()
+ * routine to do proper mapping. */
+ sksg->control = FIT_SGD_CONTROL_NOT_LAST;
+ sksg->byte_count = nbytes;
+
+ sksg->host_side_addr = sg_phys(sg);
+
+ sksg->dev_side_addr = 0;
+ sksg->next_desc_ptr = skreq->sksg_dma_address +
+ (ix + 1) * sizeof(*sksg);
+
+ skreq->n_sg++;
+ resid -= nbytes;
+ }
+
+ if (skreq->n_sg > 0) {
+ u32 ix = skreq->n_sg - 1;
+ struct fit_sg_descriptor *sksg = &skreq->sksg_list[ix];
+
+ sksg->control = FIT_SGD_CONTROL_LAST;
+ sksg->next_desc_ptr = 0;
+ }
+
+ if (unlikely(skdev->dbg_level > 1)) {
+ u32 i;
+
+ VPRINTK(skdev, "skreq=%x sksg_list=%p sksg_dma=%llx\n",
+ skreq->id, skreq->sksg_list, skreq->sksg_dma_address);
+ for (i = 0; i < skreq->n_sg; i++) {
+ struct fit_sg_descriptor *sgd = &skreq->sksg_list[i];
+
+ VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
+ "addr=0x%llx next=0x%llx\n",
+ i, sgd->byte_count, sgd->control,
+ sgd->host_side_addr, sgd->next_desc_ptr);
+ }
+ }
+
+ return 0;
+}
+
+static int skd_sg_io_prep_buffering(struct skd_device *skdev,
+ struct skd_sg_io *sksgio)
+{
+ struct skd_special_context *skspcl = sksgio->skspcl;
+ struct skd_request_context *skreq = &skspcl->req;
+ u32 dxfer_len = sksgio->dxfer_len;
+ int rc;
+
+ rc = skd_skreq_prep_buffering(skdev, skreq, dxfer_len);
+ /*
+ * Eventually, errors or not, skd_release_special() is called
+ * to recover allocations including partial allocations.
+ */
+ return rc;
+}
+
+static int skd_sg_io_copy_buffer(struct skd_device *skdev,
+ struct skd_sg_io *sksgio, int dxfer_dir)
+{
+ struct skd_special_context *skspcl = sksgio->skspcl;
+ u32 iov_ix = 0;
+ struct sg_iovec curiov;
+ u32 sksg_ix = 0;
+ u8 *bufp = NULL;
+ u32 buf_len = 0;
+ u32 resid = sksgio->dxfer_len;
+ int rc;
+
+ curiov.iov_len = 0;
+ curiov.iov_base = NULL;
+
+ if (dxfer_dir != sksgio->sg.dxfer_direction) {
+ if (dxfer_dir != SG_DXFER_TO_DEV ||
+ sksgio->sg.dxfer_direction != SG_DXFER_TO_FROM_DEV)
+ return 0;
+ }
+
+ while (resid > 0) {
+ u32 nbytes = PAGE_SIZE;
+
+ if (curiov.iov_len == 0) {
+ curiov = sksgio->iov[iov_ix++];
+ continue;
+ }
+
+ if (buf_len == 0) {
+ struct page *page;
+ page = sg_page(&skspcl->req.sg[sksg_ix++]);
+ bufp = page_address(page);
+ buf_len = PAGE_SIZE;
+ }
+
+ nbytes = min_t(u32, nbytes, resid);
+ nbytes = min_t(u32, nbytes, curiov.iov_len);
+ nbytes = min_t(u32, nbytes, buf_len);
+
+ if (dxfer_dir == SG_DXFER_TO_DEV)
+ rc = __copy_from_user(bufp, curiov.iov_base, nbytes);
+ else
+ rc = __copy_to_user(curiov.iov_base, bufp, nbytes);
+
+ if (rc)
+ return -EFAULT;
+
+ resid -= nbytes;
+ curiov.iov_len -= nbytes;
+ curiov.iov_base += nbytes;
+ buf_len -= nbytes;
+ }
+
+ return 0;
+}
+
+static int skd_sg_io_send_fitmsg(struct skd_device *skdev,
+ struct skd_sg_io *sksgio)
+{
+ struct skd_special_context *skspcl = sksgio->skspcl;
+ struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
+ struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
+
+ memset(skspcl->msg_buf, 0, SKD_N_SPECIAL_FITMSG_BYTES);
+
+ /* Initialize the FIT msg header */
+ fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
+ fmh->num_protocol_cmds_coalesced = 1;
+
+ /* Initialize the SCSI request */
+ if (sksgio->sg.dxfer_direction != SG_DXFER_NONE)
+ scsi_req->hdr.sg_list_dma_address =
+ cpu_to_be64(skspcl->req.sksg_dma_address);
+ scsi_req->hdr.tag = skspcl->req.id;
+ scsi_req->hdr.sg_list_len_bytes =
+ cpu_to_be32(skspcl->req.sg_byte_count);
+ memcpy(scsi_req->cdb, sksgio->cdb, sizeof(scsi_req->cdb));
+
+ skspcl->req.state = SKD_REQ_STATE_BUSY;
+ skd_send_special_fitmsg(skdev, skspcl);
+
+ return 0;
+}
+
+static int skd_sg_io_await(struct skd_device *skdev, struct skd_sg_io *sksgio)
+{
+ unsigned long flags;
+ int rc;
+
+ rc = wait_event_interruptible_timeout(skdev->waitq,
+ (sksgio->skspcl->req.state !=
+ SKD_REQ_STATE_BUSY),
+ msecs_to_jiffies(sksgio->sg.
+ timeout));
+
+ spin_lock_irqsave(&skdev->lock, flags);
+
+ if (sksgio->skspcl->req.state == SKD_REQ_STATE_ABORTED) {
+ DPRINTK(skdev, "skspcl %p aborted\n", sksgio->skspcl);
+
+ /* Build check cond, sense and let command finish. */
+ /* For a timeout, we must fabricate completion and sense
+ * data to complete the command */
+ sksgio->skspcl->req.completion.status =
+ SAM_STAT_CHECK_CONDITION;
+
+ memset(&sksgio->skspcl->req.err_info, 0,
+ sizeof(sksgio->skspcl->req.err_info));
+ sksgio->skspcl->req.err_info.type = 0x70;
+ sksgio->skspcl->req.err_info.key = ABORTED_COMMAND;
+ sksgio->skspcl->req.err_info.code = 0x44;
+ sksgio->skspcl->req.err_info.qual = 0;
+ rc = 0;
+ } else if (sksgio->skspcl->req.state != SKD_REQ_STATE_BUSY)
+ /* No longer on the adapter. We finish. */
+ rc = 0;
+ else {
+ /* Something's gone wrong. Still busy. Timeout or
+ * user interrupted (control-C). Mark as an orphan
+ * so it will be disposed when completed. */
+ sksgio->skspcl->orphaned = 1;
+ sksgio->skspcl = NULL;
+ if (rc == 0) {
+ DPRINTK(skdev, "timed out %p (%u ms)\n", sksgio,
+ sksgio->sg.timeout);
+ rc = -ETIMEDOUT;
+ } else {
+ DPRINTK(skdev, "cntlc %p\n", sksgio);
+ rc = -EINTR;
+ }
+ }
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+ return rc;
+}
+
+static int skd_sg_io_put_status(struct skd_device *skdev,
+ struct skd_sg_io *sksgio)
+{
+ struct sg_io_hdr *sgp = &sksgio->sg;
+ struct skd_special_context *skspcl = sksgio->skspcl;
+ int resid = 0;
+
+ u32 nb = be32_to_cpu(skspcl->req.completion.num_returned_bytes);
+
+ sgp->status = skspcl->req.completion.status;
+ resid = sksgio->dxfer_len - nb;
+
+ sgp->masked_status = sgp->status & STATUS_MASK;
+ sgp->msg_status = 0;
+ sgp->host_status = 0;
+ sgp->driver_status = 0;
+ sgp->resid = resid;
+ if (sgp->masked_status || sgp->host_status || sgp->driver_status)
+ sgp->info |= SG_INFO_CHECK;
+
+ DPRINTK(skdev, "status %x masked %x resid 0x%x\n", sgp->status,
+ sgp->masked_status, sgp->resid);
+
+ if (sgp->masked_status == SAM_STAT_CHECK_CONDITION) {
+ if (sgp->mx_sb_len > 0) {
+ struct fit_comp_error_info *ei = &skspcl->req.err_info;
+ u32 nbytes = sizeof(*ei);
+
+ nbytes = min_t(u32, nbytes, sgp->mx_sb_len);
+
+ sgp->sb_len_wr = nbytes;
+
+ if (__copy_to_user(sgp->sbp, ei, nbytes)) {
+ DPRINTK(skdev, "copy_to_user sense failed %p\n",
+ sgp->sbp);
+ return -EFAULT;
+ }
+ }
+ }
+
+ if (__copy_to_user(sksgio->argp, sgp, sizeof(sg_io_hdr_t))) {
+ DPRINTK(skdev, "copy_to_user sg failed %p\n", sksgio->argp);
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static int skd_sg_io_release_skspcl(struct skd_device *skdev,
+ struct skd_sg_io *sksgio)
+{
+ struct skd_special_context *skspcl = sksgio->skspcl;
+
+ if (skspcl != NULL) {
+ ulong flags;
+
+ sksgio->skspcl = NULL;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ skd_release_special(skdev, skspcl);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+ }
+
+ return 0;
+}
+
+/*
+ *****************************************************************************
+ * INTERNAL REQUESTS -- generated by driver itself
+ *****************************************************************************
+ */
+
+static int skd_format_internal_skspcl(struct skd_device *skdev)
+{
+ struct skd_special_context *skspcl = &skdev->internal_skspcl;
+ struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
+ struct fit_msg_hdr *fmh;
+ uint64_t dma_address;
+ struct skd_scsi_request *scsi;
+
+ fmh = (struct fit_msg_hdr *)&skspcl->msg_buf[0];
+ fmh->protocol_id = FIT_PROTOCOL_ID_SOFIT;
+ fmh->num_protocol_cmds_coalesced = 1;
+
+ scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
+ memset(scsi, 0, sizeof(*scsi));
+ dma_address = skspcl->req.sksg_dma_address;
+ scsi->hdr.sg_list_dma_address = cpu_to_be64(dma_address);
+ sgd->control = FIT_SGD_CONTROL_LAST;
+ sgd->byte_count = 0;
+ sgd->host_side_addr = skspcl->db_dma_address;
+ sgd->dev_side_addr = 0;
+ sgd->next_desc_ptr = 0LL;
+
+ return 1;
+}
+
+#define WR_BUF_SIZE SKD_N_INTERNAL_BYTES
+
+static void skd_send_internal_skspcl(struct skd_device *skdev,
+ struct skd_special_context *skspcl,
+ u8 opcode)
+{
+ struct fit_sg_descriptor *sgd = &skspcl->req.sksg_list[0];
+ struct skd_scsi_request *scsi;
+ unsigned char *buf = skspcl->data_buf;
+ int i;
+
+ if (skspcl->req.state != SKD_REQ_STATE_IDLE)
+ /*
+ * A refresh is already in progress.
+ * Just wait for it to finish.
+ */
+ return;
+
+ SKD_ASSERT((skspcl->req.id & SKD_ID_INCR) == 0);
+ skspcl->req.state = SKD_REQ_STATE_BUSY;
+ skspcl->req.id += SKD_ID_INCR;
+
+ scsi = (struct skd_scsi_request *)&skspcl->msg_buf[64];
+ scsi->hdr.tag = skspcl->req.id;
+
+ memset(scsi->cdb, 0, sizeof(scsi->cdb));
+
+ switch (opcode) {
+ case TEST_UNIT_READY:
+ scsi->cdb[0] = TEST_UNIT_READY;
+ sgd->byte_count = 0;
+ scsi->hdr.sg_list_len_bytes = 0;
+ break;
+
+ case READ_CAPACITY:
+ scsi->cdb[0] = READ_CAPACITY;
+ sgd->byte_count = SKD_N_READ_CAP_BYTES;
+ scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
+ break;
+
+ case INQUIRY:
+ scsi->cdb[0] = INQUIRY;
+ scsi->cdb[1] = 0x01; /* evpd */
+ scsi->cdb[2] = 0x80; /* serial number page */
+ scsi->cdb[4] = 0x10;
+ sgd->byte_count = 16;
+ scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
+ break;
+
+ case SYNCHRONIZE_CACHE:
+ scsi->cdb[0] = SYNCHRONIZE_CACHE;
+ sgd->byte_count = 0;
+ scsi->hdr.sg_list_len_bytes = 0;
+ break;
+
+ case WRITE_BUFFER:
+ scsi->cdb[0] = WRITE_BUFFER;
+ scsi->cdb[1] = 0x02;
+ scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
+ scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
+ sgd->byte_count = WR_BUF_SIZE;
+ scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
+ /* fill incrementing byte pattern */
+ for (i = 0; i < sgd->byte_count; i++)
+ buf[i] = i & 0xFF;
+ break;
+
+ case READ_BUFFER:
+ scsi->cdb[0] = READ_BUFFER;
+ scsi->cdb[1] = 0x02;
+ scsi->cdb[7] = (WR_BUF_SIZE & 0xFF00) >> 8;
+ scsi->cdb[8] = WR_BUF_SIZE & 0xFF;
+ sgd->byte_count = WR_BUF_SIZE;
+ scsi->hdr.sg_list_len_bytes = cpu_to_be32(sgd->byte_count);
+ memset(skspcl->data_buf, 0, sgd->byte_count);
+ break;
+
+ default:
+ SKD_ASSERT("Don't know what to send");
+ return;
+
+ }
+ skd_send_special_fitmsg(skdev, skspcl);
+}
+
+static void skd_refresh_device_data(struct skd_device *skdev)
+{
+ struct skd_special_context *skspcl = &skdev->internal_skspcl;
+
+ skd_send_internal_skspcl(skdev, skspcl, TEST_UNIT_READY);
+}
+
+static int skd_chk_read_buf(struct skd_device *skdev,
+ struct skd_special_context *skspcl)
+{
+ unsigned char *buf = skspcl->data_buf;
+ int i;
+
+ /* check for incrementing byte pattern */
+ for (i = 0; i < WR_BUF_SIZE; i++)
+ if (buf[i] != (i & 0xFF))
+ return 1;
+
+ return 0;
+}
+
+static void skd_log_check_status(struct skd_device *skdev, u8 status, u8 key,
+ u8 code, u8 qual, u8 fruc)
+{
+ /* If the check condition is of special interest, log a message */
+ if ((status == SAM_STAT_CHECK_CONDITION) && (key == 0x02)
+ && (code == 0x04) && (qual == 0x06)) {
+ pr_err("(%s): *** LOST_WRITE_DATA ERROR *** key/asc/"
+ "ascq/fruc %02x/%02x/%02x/%02x\n",
+ skd_name(skdev), key, code, qual, fruc);
+ }
+}
+
+static void skd_complete_internal(struct skd_device *skdev,
+ volatile struct fit_completion_entry_v1
+ *skcomp,
+ volatile struct fit_comp_error_info *skerr,
+ struct skd_special_context *skspcl)
+{
+ u8 *buf = skspcl->data_buf;
+ u8 status;
+ int i;
+ struct skd_scsi_request *scsi =
+ (struct skd_scsi_request *)&skspcl->msg_buf[64];
+
+ SKD_ASSERT(skspcl == &skdev->internal_skspcl);
+
+ DPRINTK(skdev, "complete internal %x\n", scsi->cdb[0]);
+
+ skspcl->req.completion = *skcomp;
+ skspcl->req.state = SKD_REQ_STATE_IDLE;
+ skspcl->req.id += SKD_ID_INCR;
+
+ status = skspcl->req.completion.status;
+
+ skd_log_check_status(skdev, status, skerr->key, skerr->code,
+ skerr->qual, skerr->fruc);
+
+ switch (scsi->cdb[0]) {
+ case TEST_UNIT_READY:
+ if (status == SAM_STAT_GOOD)
+ skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
+ else if ((status == SAM_STAT_CHECK_CONDITION) &&
+ (skerr->key == MEDIUM_ERROR))
+ skd_send_internal_skspcl(skdev, skspcl, WRITE_BUFFER);
+ else {
+ if (skdev->state == SKD_DRVR_STATE_STOPPING) {
+ VPRINTK(skdev, "TUR failed, don't send anymore"
+ "state 0x%x\n", skdev->state);
+ return;
+ }
+ DPRINTK(skdev, "**** TUR failed, retry skerr\n");
+ skd_send_internal_skspcl(skdev, skspcl, 0x00);
+ }
+ break;
+
+ case WRITE_BUFFER:
+ if (status == SAM_STAT_GOOD)
+ skd_send_internal_skspcl(skdev, skspcl, READ_BUFFER);
+ else {
+ if (skdev->state == SKD_DRVR_STATE_STOPPING) {
+ VPRINTK(skdev, "write buffer failed, don't send"
+ " anymore state 0x%x\n", skdev->state);
+ return;
+ }
+ DPRINTK(skdev,
+ "**** write buffer failed, retry skerr\n");
+ skd_send_internal_skspcl(skdev, skspcl, 0x00);
+ }
+ break;
+
+ case READ_BUFFER:
+ if (status == SAM_STAT_GOOD) {
+ if (skd_chk_read_buf(skdev, skspcl) == 0)
+ skd_send_internal_skspcl(skdev, skspcl,
+ READ_CAPACITY);
+ else {
+ pr_err(
+ "(%s):*** W/R Buffer mismatch %d ***\n",
+ skd_name(skdev), skdev->connect_retries);
+ if (skdev->connect_retries <
+ SKD_MAX_CONNECT_RETRIES) {
+ skdev->connect_retries++;
+ skd_soft_reset(skdev);
+ } else {
+ pr_err(
+ "(%s): W/R Buffer Connect Error\n",
+ skd_name(skdev));
+ return;
+ }
+ }
+
+ } else {
+ if (skdev->state == SKD_DRVR_STATE_STOPPING) {
+ VPRINTK(skdev,
+ "read buffer failed, don't send anymore"
+ "state 0x%x\n", skdev->state);
+ return;
+ }
+ DPRINTK(skdev,
+ "**** read buffer failed, retry skerr\n");
+ skd_send_internal_skspcl(skdev, skspcl, 0x00);
+ }
+ break;
+
+ case READ_CAPACITY:
+ skdev->read_cap_is_valid = 0;
+ if (status == SAM_STAT_GOOD) {
+ skdev->read_cap_last_lba =
+ (buf[0] << 24) | (buf[1] << 16) |
+ (buf[2] << 8) | buf[3];
+ skdev->read_cap_blocksize =
+ (buf[4] << 24) | (buf[5] << 16) |
+ (buf[6] << 8) | buf[7];
+
+ DPRINTK(skdev, "last lba %d, bs %d\n",
+ skdev->read_cap_last_lba,
+ skdev->read_cap_blocksize);
+
+ set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
+
+ skdev->read_cap_is_valid = 1;
+
+ skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
+ } else if ((status == SAM_STAT_CHECK_CONDITION) &&
+ (skerr->key == MEDIUM_ERROR)) {
+ skdev->read_cap_last_lba = ~0;
+ set_capacity(skdev->disk, skdev->read_cap_last_lba + 1);
+ DPRINTK(skdev,
+ "**** MEDIUM ERROR caused READCAP to fail, ignore failure and continue to inquiry\n");
+ skd_send_internal_skspcl(skdev, skspcl, INQUIRY);
+ } else {
+ DPRINTK(skdev, "**** READCAP failed, retry TUR\n");
+ skd_send_internal_skspcl(skdev, skspcl,
+ TEST_UNIT_READY);
+ }
+ break;
+
+ case INQUIRY:
+ skdev->inquiry_is_valid = 0;
+ if (status == SAM_STAT_GOOD) {
+ skdev->inquiry_is_valid = 1;
+
+ for (i = 0; i < 12; i++)
+ skdev->inq_serial_num[i] = buf[i + 4];
+ skdev->inq_serial_num[12] = 0;
+ }
+
+ if (skd_unquiesce_dev(skdev) < 0)
+ DPRINTK(skdev, "**** failed, to ONLINE device\n");
+ /* connection is complete */
+ skdev->connect_retries = 0;
+ break;
+
+ case SYNCHRONIZE_CACHE:
+ if (status == SAM_STAT_GOOD)
+ skdev->sync_done = 1;
+ else
+ skdev->sync_done = -1;
+ wake_up_interruptible(&skdev->waitq);
+ break;
+
+ default:
+ SKD_ASSERT("we didn't send this");
+ }
+}
+
+/*
+ *****************************************************************************
+ * FIT MESSAGES
+ *****************************************************************************
+ */
+
+static void skd_send_fitmsg(struct skd_device *skdev,
+ struct skd_fitmsg_context *skmsg)
+{
+ u64 qcmd;
+ struct fit_msg_hdr *fmh;
+
+ VPRINTK(skdev, "dma address 0x%llx, busy=%d\n",
+ skmsg->mb_dma_address, skdev->in_flight);
+ VPRINTK(skdev, "msg_buf 0x%p, offset %x\n",
+ skmsg->msg_buf, skmsg->offset);
+
+ qcmd = skmsg->mb_dma_address;
+ qcmd |= FIT_QCMD_QID_NORMAL;
+
+ fmh = (struct fit_msg_hdr *)skmsg->msg_buf;
+ skmsg->outstanding = fmh->num_protocol_cmds_coalesced;
+
+ if (unlikely(skdev->dbg_level > 1)) {
+ u8 *bp = (u8 *)skmsg->msg_buf;
+ int i;
+ for (i = 0; i < skmsg->length; i += 8) {
+ VPRINTK(skdev, " msg[%2d] %02x %02x %02x %02x "
+ "%02x %02x %02x %02x\n",
+ i, bp[i + 0], bp[i + 1], bp[i + 2],
+ bp[i + 3], bp[i + 4], bp[i + 5],
+ bp[i + 6], bp[i + 7]);
+ if (i == 0)
+ i = 64 - 8;
+ }
+ }
+
+ if (skmsg->length > 256)
+ qcmd |= FIT_QCMD_MSGSIZE_512;
+ else if (skmsg->length > 128)
+ qcmd |= FIT_QCMD_MSGSIZE_256;
+ else if (skmsg->length > 64)
+ qcmd |= FIT_QCMD_MSGSIZE_128;
+ else
+ /*
+ * This makes no sense because the FIT msg header is
+ * 64 bytes. If the msg is only 64 bytes long it has
+ * no payload.
+ */
+ qcmd |= FIT_QCMD_MSGSIZE_64;
+
+ SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
+
+}
+
+static void skd_send_special_fitmsg(struct skd_device *skdev,
+ struct skd_special_context *skspcl)
+{
+ u64 qcmd;
+
+ if (unlikely(skdev->dbg_level > 1)) {
+ u8 *bp = (u8 *)skspcl->msg_buf;
+ int i;
+
+ for (i = 0; i < SKD_N_SPECIAL_FITMSG_BYTES; i += 8) {
+ VPRINTK(skdev,
+ " spcl[%2d] %02x %02x %02x %02x "
+ "%02x %02x %02x %02x\n", i,
+ bp[i + 0], bp[i + 1], bp[i + 2], bp[i + 3],
+ bp[i + 4], bp[i + 5], bp[i + 6], bp[i + 7]);
+ if (i == 0)
+ i = 64 - 8;
+ }
+
+ VPRINTK(skdev, "skspcl=%p id=%04x sksg_list=%p sksg_dma=%llx\n",
+ skspcl, skspcl->req.id, skspcl->req.sksg_list,
+ skspcl->req.sksg_dma_address);
+ for (i = 0; i < skspcl->req.n_sg; i++) {
+ struct fit_sg_descriptor *sgd =
+ &skspcl->req.sksg_list[i];
+
+ VPRINTK(skdev, " sg[%d] count=%u ctrl=0x%x "
+ "addr=0x%llx next=0x%llx\n",
+ i, sgd->byte_count, sgd->control,
+ sgd->host_side_addr, sgd->next_desc_ptr);
+ }
+ }
+
+ /*
+ * Special FIT msgs are always 128 bytes: a 64-byte FIT hdr
+ * and one 64-byte SSDI command.
+ */
+ qcmd = skspcl->mb_dma_address;
+ qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128;
+
+ SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND);
+}
+
+/*
+ *****************************************************************************
+ * COMPLETION QUEUE
+ *****************************************************************************
+ */
+
+static void skd_complete_other(struct skd_device *skdev,
+ volatile struct fit_completion_entry_v1 *skcomp,
+ volatile struct fit_comp_error_info *skerr);
+
+
+static void skd_requeue_request(struct skd_device *skdev,
+ struct skd_request_context *skreq);
+
+struct sns_info {
+ u8 type;
+ u8 stat;
+ u8 key;
+ u8 asc;
+ u8 ascq;
+ u8 mask;
+ enum skd_check_status_action action;
+};
+
+static struct sns_info skd_chkstat_table[] = {
+ /* Good */
+ { 0x70, 0x02, RECOVERED_ERROR, 0, 0, 0x1c,
+ SKD_CHECK_STATUS_REPORT_GOOD },
+
+ /* Smart alerts */
+ { 0x70, 0x02, NO_SENSE, 0x0B, 0x00, 0x1E, /* warnings */
+ SKD_CHECK_STATUS_REPORT_SMART_ALERT },
+ { 0x70, 0x02, NO_SENSE, 0x5D, 0x00, 0x1E, /* thresholds */
+ SKD_CHECK_STATUS_REPORT_SMART_ALERT },
+ { 0x70, 0x02, RECOVERED_ERROR, 0x0B, 0x01, 0x1F, /* temperature over trigger */
+ SKD_CHECK_STATUS_REPORT_SMART_ALERT },
+
+ /* Retry (with limits) */
+ { 0x70, 0x02, 0x0B, 0, 0, 0x1C, /* This one is for DMA ERROR */
+ SKD_CHECK_STATUS_REQUEUE_REQUEST },
+ { 0x70, 0x02, 0x06, 0x0B, 0x00, 0x1E, /* warnings */
+ SKD_CHECK_STATUS_REQUEUE_REQUEST },
+ { 0x70, 0x02, 0x06, 0x5D, 0x00, 0x1E, /* thresholds */
+ SKD_CHECK_STATUS_REQUEUE_REQUEST },
+ { 0x70, 0x02, 0x06, 0x80, 0x30, 0x1F, /* backup power */
+ SKD_CHECK_STATUS_REQUEUE_REQUEST },
+
+ /* Busy (or about to be) */
+ { 0x70, 0x02, 0x06, 0x3f, 0x01, 0x1F, /* fw changed */
+ SKD_CHECK_STATUS_BUSY_IMMINENT },
+};
+
+/*
+ * Look up status and sense data to decide how to handle the error
+ * from the device.
+ * mask says which fields must match e.g., mask=0x18 means check
+ * type and stat, ignore key, asc, ascq.
+ */
+
+static enum skd_check_status_action skd_check_status(struct skd_device *skdev,
+ u8 cmp_status,
+ volatile struct fit_comp_error_info *skerr)
+{
+ int i, n;
+
+ pr_err("(%s): key/asc/ascq/fruc %02x/%02x/%02x/%02x\n",
+ skd_name(skdev), skerr->key, skerr->code, skerr->qual,
+ skerr->fruc);
+
+ VPRINTK(skdev, "stat: t=%02x stat=%02x k=%02x c=%02x q=%02x "
+ "fruc=%02x\n", skerr->type, cmp_status, skerr->key,
+ skerr->code, skerr->qual, skerr->fruc);
+
+ /* Does the info match an entry in the good category? */
+ n = sizeof(skd_chkstat_table) / sizeof(skd_chkstat_table[0]);
+ for (i = 0; i < n; i++) {
+ struct sns_info *sns = &skd_chkstat_table[i];
+
+ if (sns->mask & 0x10)
+ if (skerr->type != sns->type)
+ continue;
+
+ if (sns->mask & 0x08)
+ if (cmp_status != sns->stat)
+ continue;
+
+ if (sns->mask & 0x04)
+ if (skerr->key != sns->key)
+ continue;
+
+ if (sns->mask & 0x02)
+ if (skerr->code != sns->asc)
+ continue;
+
+ if (sns->mask & 0x01)
+ if (skerr->qual != sns->ascq)
+ continue;
+
+ if (sns->action == SKD_CHECK_STATUS_REPORT_SMART_ALERT) {
+ pr_err("(%s): SMART Alert: sense key/asc/ascq "
+ "%02x/%02x/%02x\n",
+ skd_name(skdev), skerr->key,
+ skerr->code, skerr->qual);
+ }
+ return sns->action;
+ }
+
+ /* No other match, so nonzero status means error,
+ * zero status means good
+ */
+ if (cmp_status) {
+ DPRINTK(skdev, "status check: error\n");
+ return SKD_CHECK_STATUS_REPORT_ERROR;
+ }
+
+ DPRINTK(skdev, "status check good default\n");
+ return SKD_CHECK_STATUS_REPORT_GOOD;
+}
+
+static void skd_resolve_req_exception(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ u8 cmp_status = skreq->completion.status;
+
+ switch (skd_check_status(skdev, cmp_status, &skreq->err_info)) {
+ case SKD_CHECK_STATUS_REPORT_GOOD:
+ case SKD_CHECK_STATUS_REPORT_SMART_ALERT:
+ skd_end_request(skdev, skreq, 0);
+ break;
+
+ case SKD_CHECK_STATUS_BUSY_IMMINENT:
+ skd_log_skreq(skdev, skreq, "retry(busy)");
+ skd_requeue_request(skdev, skreq);
+ pr_info("(%s) drive BUSY imminent\n", skd_name(skdev));
+ skdev->state = SKD_DRVR_STATE_BUSY_IMMINENT;
+ skdev->timer_countdown = SKD_TIMER_MINUTES(20);
+ skd_quiesce_dev(skdev);
+ break;
+
+ case SKD_CHECK_STATUS_REQUEUE_REQUEST:
+ if (!skd_bio) {
+ if ((unsigned long) ++skreq->req->special <
+ SKD_MAX_RETRIES) {
+ skd_log_skreq(skdev, skreq, "retry");
+ skd_requeue_request(skdev, skreq);
+ break;
+ }
+ }
+ /* fall through to report error */
+
+ case SKD_CHECK_STATUS_REPORT_ERROR:
+ default:
+ skd_end_request(skdev, skreq, -EIO);
+ break;
+ }
+}
+
+static void skd_requeue_request(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ if (!skd_bio) {
+ blk_requeue_request(skdev->queue, skreq->req);
+ } else {
+ bio_list_add_head(&skdev->bio_queue, skreq->bio);
+ skreq->bio = NULL;
+ }
+}
+
+
+
+/* assume spinlock is already held */
+static void skd_release_skreq(struct skd_device *skdev,
+ struct skd_request_context *skreq)
+{
+ u32 msg_slot;
+ struct skd_fitmsg_context *skmsg;
+
+ u32 timo_slot;
+
+ /*
+ * Reclaim the FIT msg buffer if this is
+ * the first of the requests it carried to
+ * be completed. The FIT msg buffer used to
+ * send this request cannot be reused until
+ * we are sure the s1120 card has copied
+ * it to its memory. The FIT msg might have
+ * contained several requests. As soon as
+ * any of them are completed we know that
+ * the entire FIT msg was transferred.
+ * Only the first completed request will
+ * match the FIT msg buffer id. The FIT
+ * msg buffer id is immediately updated.
+ * When subsequent requests complete the FIT
+ * msg buffer id won't match, so we know
+ * quite cheaply that it is already done.
+ */
+ msg_slot = skreq->fitmsg_id & SKD_ID_SLOT_MASK;
+ SKD_ASSERT(msg_slot < skdev->num_fitmsg_context);
+
+ skmsg = &skdev->skmsg_table[msg_slot];
+ if (skmsg->id == skreq->fitmsg_id) {
+ SKD_ASSERT(skmsg->state == SKD_MSG_STATE_BUSY);
+ SKD_ASSERT(skmsg->outstanding > 0);
+ skmsg->outstanding--;
+ if (skmsg->outstanding == 0) {
+ skmsg->state = SKD_MSG_STATE_IDLE;
+ skmsg->id += SKD_ID_INCR;
+ skmsg->next = skdev->skmsg_free_list;
+ skdev->skmsg_free_list = skmsg;
+ }
+ }
+
+ /*
+ * Decrease the number of active requests.
+ * Also decrements the count in the timeout slot.
+ */
+ SKD_ASSERT(skdev->in_flight > 0);
+ skdev->in_flight -= 1;
+
+ timo_slot = skreq->timeout_stamp & SKD_TIMEOUT_SLOT_MASK;
+ SKD_ASSERT(skdev->timeout_slot[timo_slot] > 0);
+ skdev->timeout_slot[timo_slot] -= 1;
+
+ /*
+ * Reset backpointer
+ */
+ if (likely(!skd_bio))
+ skreq->req = NULL;
+ else
+ skreq->bio = NULL;
+
+
+ /*
+ * Reclaim the skd_request_context
+ */
+ skreq->state = SKD_REQ_STATE_IDLE;
+ skreq->id += SKD_ID_INCR;
+ skreq->next = skdev->skreq_free_list;
+ skdev->skreq_free_list = skreq;
+}
+
+#define DRIVER_INQ_EVPD_PAGE_CODE 0xDA
+
+static void skd_do_inq_page_00(struct skd_device *skdev,
+ volatile struct fit_completion_entry_v1 *skcomp,
+ volatile struct fit_comp_error_info *skerr,
+ uint8_t *cdb, uint8_t *buf)
+{
+ uint16_t insert_pt, max_bytes, drive_pages, drive_bytes, new_size;
+
+ /* Caller requested "supported pages". The driver needs to insert
+ * its page.
+ */
+ VPRINTK(skdev, "skd_do_driver_inquiry: modify supported pages.\n");
+
+ /* If the device rejected the request because the CDB was
+ * improperly formed, then just leave.
+ */
+ if (skcomp->status == SAM_STAT_CHECK_CONDITION &&
+ skerr->key == ILLEGAL_REQUEST && skerr->code == 0x24)
+ return;
+
+ /* Get the amount of space the caller allocated */
+ max_bytes = (cdb[3] << 8) | cdb[4];
+
+ /* Get the number of pages actually returned by the device */
+ drive_pages = (buf[2] << 8) | buf[3];
+ drive_bytes = drive_pages + 4;
+ new_size = drive_pages + 1;
+
+ /* Supported pages must be in numerical order, so find where
+ * the driver page needs to be inserted into the list of
+ * pages returned by the device.
+ */
+ for (insert_pt = 4; insert_pt < drive_bytes; insert_pt++) {
+ if (buf[insert_pt] == DRIVER_INQ_EVPD_PAGE_CODE)
+ return; /* Device using this page code. abort */
+ else if (buf[insert_pt] > DRIVER_INQ_EVPD_PAGE_CODE)
+ break;
+ }
+
+ if (insert_pt < max_bytes) {
+ uint16_t u;
+
+ /* Shift everything up one byte to make room. */
+ for (u = new_size + 3; u > insert_pt; u--)
+ buf[u] = buf[u - 1];
+ buf[insert_pt] = DRIVER_INQ_EVPD_PAGE_CODE;
+
+ /* SCSI byte order increment of num_returned_bytes by 1 */
+ skcomp->num_returned_bytes =
+ be32_to_cpu(skcomp->num_returned_bytes) + 1;
+ skcomp->num_returned_bytes =
+ be32_to_cpu(skcomp->num_returned_bytes);
+ }
+
+ /* update page length field to reflect the driver's page too */
+ buf[2] = (uint8_t)((new_size >> 8) & 0xFF);
+ buf[3] = (uint8_t)((new_size >> 0) & 0xFF);
+}
+
+static void skd_get_link_info(struct pci_dev *pdev, u8 *speed, u8 *width)
+{
+ int pcie_reg;
+ u16 pci_bus_speed;
+ u8 pci_lanes;
+
+ pcie_reg = pci_find_capability(pdev, PCI_CAP_ID_EXP);
+ if (pcie_reg) {
+ u16 linksta;
+ pci_read_config_word(pdev, pcie_reg + PCI_EXP_LNKSTA, &linksta);
+
+ pci_bus_speed = linksta & 0xF;
+ pci_lanes = (linksta & 0x3F0) >> 4;
+ } else {
+ *speed = STEC_LINK_UNKNOWN;
+ *width = 0xFF;
+ return;
+ }
+
+ switch (pci_bus_speed) {
+ case 1:
+ *speed = STEC_LINK_2_5GTS;
+ break;
+ case 2:
+ *speed = STEC_LINK_5GTS;
+ break;
+ case 3:
+ *speed = STEC_LINK_8GTS;
+ break;
+ default:
+ *speed = STEC_LINK_UNKNOWN;
+ break;
+ }
+
+ if (pci_lanes <= 0x20)
+ *width = pci_lanes;
+ else
+ *width = 0xFF;
+}
+
+static void skd_do_inq_page_da(struct skd_device *skdev,
+ volatile struct fit_completion_entry_v1 *skcomp,
+ volatile struct fit_comp_error_info *skerr,
+ uint8_t *cdb, uint8_t *buf)
+{
+ unsigned max_bytes;
+ struct driver_inquiry_data inq;
+ u16 val;
+
+ VPRINTK(skdev, "skd_do_driver_inquiry: return driver page\n");
+
+ memset(&inq, 0, sizeof(inq));
+
+ inq.page_code = DRIVER_INQ_EVPD_PAGE_CODE;
+
+ if (skdev->pdev && skdev->pdev->bus) {
+ skd_get_link_info(skdev->pdev,
+ &inq.pcie_link_speed, &inq.pcie_link_lanes);
+ inq.pcie_bus_number = cpu_to_be16(skdev->pdev->bus->number);
+ inq.pcie_device_number = PCI_SLOT(skdev->pdev->devfn);
+ inq.pcie_function_number = PCI_FUNC(skdev->pdev->devfn);
+
+ pci_read_config_word(skdev->pdev, PCI_VENDOR_ID, &val);
+ inq.pcie_vendor_id = cpu_to_be16(val);
+
+ pci_read_config_word(skdev->pdev, PCI_DEVICE_ID, &val);
+ inq.pcie_device_id = cpu_to_be16(val);
+
+ pci_read_config_word(skdev->pdev, PCI_SUBSYSTEM_VENDOR_ID,
+ &val);
+ inq.pcie_subsystem_vendor_id = cpu_to_be16(val);
+
+ pci_read_config_word(skdev->pdev, PCI_SUBSYSTEM_ID, &val);
+ inq.pcie_subsystem_device_id = cpu_to_be16(val);
+ } else {
+ inq.pcie_bus_number = 0xFFFF;
+ inq.pcie_device_number = 0xFF;
+ inq.pcie_function_number = 0xFF;
+ inq.pcie_link_speed = 0xFF;
+ inq.pcie_link_lanes = 0xFF;
+ inq.pcie_vendor_id = 0xFFFF;
+ inq.pcie_device_id = 0xFFFF;
+ inq.pcie_subsystem_vendor_id = 0xFFFF;
+ inq.pcie_subsystem_device_id = 0xFFFF;
+ }
+
+ /* Driver version, fixed lenth, padded with spaces on the right */
+ inq.driver_version_length = sizeof(inq.driver_version);
+ memset(&inq.driver_version, ' ', sizeof(inq.driver_version));
+ memcpy(inq.driver_version, DRV_VER_COMPL,
+ min(sizeof(inq.driver_version), strlen(DRV_VER_COMPL)));
+
+ inq.page_length = cpu_to_be16((sizeof(inq) - 4));
+
+ /* Clear the error set by the device */
+ skcomp->status = SAM_STAT_GOOD;
+ memset((void *)skerr, 0, sizeof(*skerr));
+
+ /* copy response into output buffer */
+ max_bytes = (cdb[3] << 8) | cdb[4];
+ memcpy(buf, &inq, min_t(unsigned, max_bytes, sizeof(inq)));
+
+ skcomp->num_returned_bytes =
+ be32_to_cpu(min_t(uint16_t, max_bytes, sizeof(inq)));
+}
+
+static void skd_do_driver_inq(struct skd_device *skdev,
+ volatile struct fit_completion_entry_v1 *skcomp,
+ volatile struct fit_comp_error_info *skerr,
+ uint8_t *cdb, uint8_t *buf)
+{
+ if (!buf)
+ return;
+ else if (cdb[0] != INQUIRY)
+ return; /* Not an INQUIRY */
+ else if ((cdb[1] & 1) == 0)
+ return; /* EVPD not set */
+ else if (cdb[2] == 0)
+ /* Need to add driver's page to supported pages list */
+ skd_do_inq_page_00(skdev, skcomp, skerr, cdb, buf);
+ else if (cdb[2] == DRIVER_INQ_EVPD_PAGE_CODE)
+ /* Caller requested driver's page */
+ skd_do_inq_page_da(skdev, skcomp, skerr, cdb, buf);
+}
+
+static unsigned char *skd_sg_1st_page_ptr(struct scatterlist *sg)
+{
+ if (!sg)
+ return NULL;
+ if (!sg_page(sg))
+ return NULL;
+ return sg_virt(sg);
+}
+
+static void skd_process_scsi_inq(struct skd_device *skdev,
+ volatile struct fit_completion_entry_v1
+ *skcomp,
+ volatile struct fit_comp_error_info *skerr,
+ struct skd_special_context *skspcl)
+{
+ uint8_t *buf;
+ struct fit_msg_hdr *fmh = (struct fit_msg_hdr *)skspcl->msg_buf;
+ struct skd_scsi_request *scsi_req = (struct skd_scsi_request *)&fmh[1];
+
+ dma_sync_sg_for_cpu(skdev->class_dev, skspcl->req.sg, skspcl->req.n_sg,
+ skspcl->req.sg_data_dir);
+ buf = skd_sg_1st_page_ptr(skspcl->req.sg);
+
+ if (buf)
+ skd_do_driver_inq(skdev, skcomp, skerr, scsi_req->cdb, buf);
+}
+
+
+static int skd_isr_completion_posted(struct skd_device *skdev,
+ int limit, int *enqueued)
+{
+ volatile struct fit_completion_entry_v1 *skcmp = NULL;
+ volatile struct fit_comp_error_info *skerr;
+ u16 req_id;
+ u32 req_slot;
+ struct skd_request_context *skreq;
+ u16 cmp_cntxt = 0;
+ u8 cmp_status = 0;
+ u8 cmp_cycle = 0;
+ u32 cmp_bytes = 0;
+ int rc = 0;
+ int processed = 0;
+ int ret;
+
+
+ for (;; ) {
+ SKD_ASSERT(skdev->skcomp_ix < SKD_N_COMPLETION_ENTRY);
+
+ skcmp = &skdev->skcomp_table[skdev->skcomp_ix];
+ cmp_cycle = skcmp->cycle;
+ cmp_cntxt = skcmp->tag;
+ cmp_status = skcmp->status;
+ cmp_bytes = be32_to_cpu(skcmp->num_returned_bytes);
+
+ skerr = &skdev->skerr_table[skdev->skcomp_ix];
+
+ VPRINTK(skdev,
+ "cycle=%d ix=%d got cycle=%d cmdctxt=0x%x stat=%d "
+ "busy=%d rbytes=0x%x proto=%d\n", skdev->skcomp_cycle,
+ skdev->skcomp_ix, cmp_cycle, cmp_cntxt, cmp_status,
+ skdev->in_flight, cmp_bytes, skdev->proto_ver);
+
+ if (cmp_cycle != skdev->skcomp_cycle) {
+ VPRINTK(skdev, "end of completions\n");
+ break;
+ }
+ /*
+ * Update the completion queue head index and possibly
+ * the completion cycle count. 8-bit wrap-around.
+ */
+ skdev->skcomp_ix++;
+ if (skdev->skcomp_ix >= SKD_N_COMPLETION_ENTRY) {
+ skdev->skcomp_ix = 0;
+ skdev->skcomp_cycle++;
+ }
+
+ /*
+ * The command context is a unique 32-bit ID. The low order
+ * bits help locate the request. The request is usually a
+ * r/w request (see skd_start() above) or a special request.
+ */
+ req_id = cmp_cntxt;
+ req_slot = req_id & SKD_ID_SLOT_AND_TABLE_MASK;
+
+ /* Is this other than a r/w request? */
+ if (req_slot >= skdev->num_req_context) {
+ /*
+ * This is not a completion for a r/w request.
+ */
+ skd_complete_other(skdev, skcmp, skerr);
+ continue;
+ }
+
+ skreq = &skdev->skreq_table[req_slot];
+
+ /*
+ * Make sure the request ID for the slot matches.
+ */
+ if (skreq->id != req_id) {
+ DPRINTK(skdev, "mismatch comp_id=0x%x req_id=0x%x\n",
+ req_id, skreq->id);
+ {
+ u16 new_id = cmp_cntxt;
+ pr_err("(%s): Completion mismatch "
+ "comp_id=0x%04x skreq=0x%04x new=0x%04x\n",
+ skd_name(skdev), req_id,
+ skreq->id, new_id);
+
+ continue;
+ }
+ }
+
+ SKD_ASSERT(skreq->state == SKD_REQ_STATE_BUSY);
+
+ if (skreq->state == SKD_REQ_STATE_ABORTED) {
+ DPRINTK(skdev, "reclaim req %p id=%04x\n",
+ skreq, skreq->id);
+ /* a previously timed out command can
+ * now be cleaned up */
+ skd_release_skreq(skdev, skreq);
+ continue;
+ }
+
+ skreq->completion = *skcmp;
+ if (unlikely(cmp_status == SAM_STAT_CHECK_CONDITION)) {
+ skreq->err_info = *skerr;
+ skd_log_check_status(skdev, cmp_status, skerr->key,
+ skerr->code, skerr->qual,
+ skerr->fruc);
+ }
+ /* Release DMA resources for the request. */
+ if (skreq->n_sg > 0)
+ skd_postop_sg_list(skdev, skreq);
+
+ if (((!skd_bio) && !skreq->req) ||
+ ((skd_bio) && !skreq->bio)) {
+ DPRINTK(skdev, "NULL backptr skdreq %p, "
+ "req=0x%x req_id=0x%x\n",
+ skreq, skreq->id, req_id);
+ } else {
+ /*
+ * Capture the outcome and post it back to the
+ * native request.
+ */
+ if (likely(cmp_status == SAM_STAT_GOOD)) {
+ if (unlikely(skreq->flush_cmd)) {
+ if (skd_bio) {
+ /* if empty size bio, we are all done */
+ if (bio_sectors(skreq->bio) == 0) {
+ skd_end_request(skdev, skreq, 0);
+ } else {
+ ret = skd_flush_cmd_enqueue(skdev, (void *)skreq->bio);
+ if (ret != 0) {
+ pr_err("Failed to enqueue flush bio with Data. Err=%d.\n", ret);
+ skd_end_request(skdev, skreq, ret);
+ } else {
+ ((*enqueued)++);
+ }
+ }
+ } else {
+ skd_end_request(skdev, skreq, 0);
+ }
+ } else {
+ skd_end_request(skdev, skreq, 0);
+ }
+ } else {
+ skd_resolve_req_exception(skdev, skreq);
+ }
+ }
+
+ /*
+ * Release the skreq, its FIT msg (if one), timeout slot,
+ * and queue depth.
+ */
+ skd_release_skreq(skdev, skreq);
+
+ /* skd_isr_comp_limit equal zero means no limit */
+ if (limit) {
+ if (++processed >= limit) {
+ rc = 1;
+ break;
+ }
+ }
+ }
+
+ if ((skdev->state == SKD_DRVR_STATE_PAUSING)
+ && (skdev->in_flight) == 0) {
+ skdev->state = SKD_DRVR_STATE_PAUSED;
+ wake_up_interruptible(&skdev->waitq);
+ }
+
+ return rc;
+}
+
+static void skd_complete_other(struct skd_device *skdev,
+ volatile struct fit_completion_entry_v1 *skcomp,
+ volatile struct fit_comp_error_info *skerr)
+{
+ u32 req_id = 0;
+ u32 req_table;
+ u32 req_slot;
+ struct skd_special_context *skspcl;
+
+ req_id = skcomp->tag;
+ req_table = req_id & SKD_ID_TABLE_MASK;
+ req_slot = req_id & SKD_ID_SLOT_MASK;
+
+ DPRINTK(skdev, "table=0x%x id=0x%x slot=%d\n", req_table, req_id,
+ req_slot);
+
+ /*
+ * Based on the request id, determine how to dispatch this completion.
+ * This swich/case is finding the good cases and forwarding the
+ * completion entry. Errors are reported below the switch.
+ */
+ switch (req_table) {
+ case SKD_ID_RW_REQUEST:
+ /*
+ * The caller, skd_completion_posted_isr() above,
+ * handles r/w requests. The only way we get here
+ * is if the req_slot is out of bounds.
+ */
+ break;
+
+ case SKD_ID_SPECIAL_REQUEST:
+ /*
+ * Make sure the req_slot is in bounds and that the id
+ * matches.
+ */
+ if (req_slot < skdev->n_special) {
+ skspcl = &skdev->skspcl_table[req_slot];
+ if (skspcl->req.id == req_id &&
+ skspcl->req.state == SKD_REQ_STATE_BUSY) {
+ skd_complete_special(skdev,
+ skcomp, skerr, skspcl);
+ return;
+ }
+ }
+ break;
+
+ case SKD_ID_INTERNAL:
+ if (req_slot == 0) {
+ skspcl = &skdev->internal_skspcl;
+ if (skspcl->req.id == req_id &&
+ skspcl->req.state == SKD_REQ_STATE_BUSY) {
+ skd_complete_internal(skdev,
+ skcomp, skerr, skspcl);
+ return;
+ }
+ }
+ break;
+
+ case SKD_ID_FIT_MSG:
+ /*
+ * These id's should never appear in a completion record.
+ */
+ break;
+
+ default:
+ /*
+ * These id's should never appear anywhere;
+ */
+ break;
+ }
+
+ /*
+ * If we get here it is a bad or stale id.
+ */
+}
+
+static void skd_complete_special(struct skd_device *skdev,
+ volatile struct fit_completion_entry_v1
+ *skcomp,
+ volatile struct fit_comp_error_info *skerr,
+ struct skd_special_context *skspcl)
+{
+ DPRINTK(skdev, " completing special request %p\n", skspcl);
+ if (skspcl->orphaned) {
+ /* Discard orphaned request */
+ /* ?: Can this release directly or does it need
+ * to use a worker? */
+ DPRINTK(skdev, "release orphaned %p\n", skspcl);
+ skd_release_special(skdev, skspcl);
+ return;
+ }
+
+ skd_process_scsi_inq(skdev, skcomp, skerr, skspcl);
+
+ skspcl->req.state = SKD_REQ_STATE_COMPLETED;
+ skspcl->req.completion = *skcomp;
+ skspcl->req.err_info = *skerr;
+
+ skd_log_check_status(skdev, skspcl->req.completion.status, skerr->key,
+ skerr->code, skerr->qual, skerr->fruc);
+
+ wake_up_interruptible(&skdev->waitq);
+}
+
+/* assume spinlock is already held */
+static void skd_release_special(struct skd_device *skdev,
+ struct skd_special_context *skspcl)
+{
+ int i, was_depleted;
+
+ for (i = 0; i < skspcl->req.n_sg; i++) {
+
+ struct page *page = sg_page(&skspcl->req.sg[i]);
+ __free_page(page);
+ }
+
+ was_depleted = (skdev->skspcl_free_list == NULL);
+
+ skspcl->req.state = SKD_REQ_STATE_IDLE;
+ skspcl->req.id += SKD_ID_INCR;
+ skspcl->req.next =
+ (struct skd_request_context *)skdev->skspcl_free_list;
+ skdev->skspcl_free_list = (struct skd_special_context *)skspcl;
+
+ if (was_depleted) {
+ DPRINTK(skdev, "skspcl was depleted\n");
+ /* Free list was depleted. Their might be waiters. */
+ wake_up_interruptible(&skdev->waitq);
+ }
+}
+
+static void skd_reset_skcomp(struct skd_device *skdev)
+{
+ u32 nbytes;
+ struct fit_completion_entry_v1 *skcomp;
+
+ nbytes = sizeof(*skcomp) * SKD_N_COMPLETION_ENTRY;
+ nbytes += sizeof(struct fit_comp_error_info) * SKD_N_COMPLETION_ENTRY;
+
+ memset(skdev->skcomp_table, 0, nbytes);
+
+ skdev->skcomp_ix = 0;
+ skdev->skcomp_cycle = 1;
+}
+
+/*
+ *****************************************************************************
+ * INTERRUPTS
+ *****************************************************************************
+ */
+static void skd_completion_worker(struct work_struct *work)
+{
+ struct skd_device *skdev =
+ container_of(work, struct skd_device, completion_worker);
+ unsigned long flags;
+ int flush_enqueued = 0;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+
+ /*
+ * pass in limit=0, which means no limit..
+ * process everything in compq
+ */
+ skd_isr_completion_posted(skdev, 0, &flush_enqueued);
+ skd_request_fn(skdev->queue);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+}
+
+static void skd_isr_msg_from_dev(struct skd_device *skdev);
+
+irqreturn_t
+static skd_isr(int irq, void *ptr)
+{
+ struct skd_device *skdev;
+ u32 intstat;
+ u32 ack;
+ int rc = 0;
+ int deferred = 0;
+ int flush_enqueued = 0;
+
+ skdev = (struct skd_device *)ptr;
+ spin_lock(&skdev->lock);
+
+ for (;; ) {
+ intstat = SKD_READL(skdev, FIT_INT_STATUS_HOST);
+
+ ack = FIT_INT_DEF_MASK;
+ ack &= intstat;
+
+ VPRINTK(skdev, "intstat=0x%x ack=0x%x\n", intstat, ack);
+
+ /* As long as there is an int pending on device, keep
+ * running loop. When none, get out, but if we've never
+ * done any processing, call completion handler?
+ */
+ if (ack == 0) {
+ /* No interrupts on device, but run the completion
+ * processor anyway?
+ */
+ if (rc == 0)
+ if (likely (skdev->state
+ == SKD_DRVR_STATE_ONLINE))
+ deferred = 1;
+ break;
+ }
+
+ rc = IRQ_HANDLED;
+
+ SKD_WRITEL(skdev, ack, FIT_INT_STATUS_HOST);
+
+ if (likely((skdev->state != SKD_DRVR_STATE_LOAD) &&
+ (skdev->state != SKD_DRVR_STATE_STOPPING))) {
+ if (intstat & FIT_ISH_COMPLETION_POSTED) {
+ /*
+ * If we have already deferred completion
+ * processing, don't bother running it again
+ */
+ if (deferred == 0)
+ deferred =
+ skd_isr_completion_posted(skdev,
+ skd_isr_comp_limit, &flush_enqueued);
+ }
+
+ if (intstat & FIT_ISH_FW_STATE_CHANGE) {
+ skd_isr_fwstate(skdev);
+ if (skdev->state == SKD_DRVR_STATE_FAULT ||
+ skdev->state ==
+ SKD_DRVR_STATE_DISAPPEARED) {
+ spin_unlock(&skdev->lock);
+ return rc;
+ }
+ }
+
+ if (intstat & FIT_ISH_MSG_FROM_DEV)
+ skd_isr_msg_from_dev(skdev);
+ }
+ }
+
+ if (unlikely(flush_enqueued))
+ skd_request_fn(skdev->queue);
+
+ if (deferred)
+ schedule_work(&skdev->completion_worker);
+ else if (!flush_enqueued)
+ skd_request_fn(skdev->queue);
+
+ spin_unlock(&skdev->lock);
+
+ return rc;
+}
+
+
+static void skd_drive_fault(struct skd_device *skdev)
+{
+ skdev->state = SKD_DRVR_STATE_FAULT;
+ pr_err("(%s): Drive FAULT\n", skd_name(skdev));
+}
+
+static void skd_drive_disappeared(struct skd_device *skdev)
+{
+ skdev->state = SKD_DRVR_STATE_DISAPPEARED;
+ pr_err("(%s): Drive DISAPPEARED\n", skd_name(skdev));
+}
+
+static void skd_isr_fwstate(struct skd_device *skdev)
+{
+ u32 sense;
+ u32 state;
+ u32 mtd;
+ int prev_driver_state = skdev->state;
+
+ sense = SKD_READL(skdev, FIT_STATUS);
+ state = sense & FIT_SR_DRIVE_STATE_MASK;
+
+ pr_err("(%s): s1120 state %s(%d)=>%s(%d)\n",
+ skd_name(skdev),
+ skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
+ skd_drive_state_to_str(state), state);
+
+ skdev->drive_state = state;
+
+ switch (skdev->drive_state) {
+ case FIT_SR_DRIVE_INIT:
+ if (skdev->state == SKD_DRVR_STATE_PROTOCOL_MISMATCH) {
+ skd_disable_interrupts(skdev);
+ break;
+ }
+ if (skdev->state == SKD_DRVR_STATE_RESTARTING)
+ skd_recover_requests(skdev, 0);
+ if (skdev->state == SKD_DRVR_STATE_WAIT_BOOT) {
+ skdev->timer_countdown = SKD_STARTING_TIMO;
+ skdev->state = SKD_DRVR_STATE_STARTING;
+ skd_soft_reset(skdev);
+ break;
+ }
+ mtd = FIT_MXD_CONS(FIT_MTD_FITFW_INIT, 0, 0);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_SR_DRIVE_ONLINE:
+ skdev->cur_max_queue_depth = skd_max_queue_depth;
+ if (skdev->cur_max_queue_depth > skdev->dev_max_queue_depth)
+ skdev->cur_max_queue_depth = skdev->dev_max_queue_depth;
+
+ skdev->queue_low_water_mark =
+ skdev->cur_max_queue_depth * 2 / 3 + 1;
+ if (skdev->queue_low_water_mark < 1)
+ skdev->queue_low_water_mark = 1;
+ pr_info(
+ "(%s): Queue depth limit=%d dev=%d lowat=%d\n",
+ skd_name(skdev),
+ skdev->cur_max_queue_depth,
+ skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
+
+ skd_refresh_device_data(skdev);
+ break;
+
+ case FIT_SR_DRIVE_BUSY:
+ skdev->state = SKD_DRVR_STATE_BUSY;
+ skdev->timer_countdown = SKD_BUSY_TIMO;
+ skd_quiesce_dev(skdev);
+ break;
+ case FIT_SR_DRIVE_BUSY_SANITIZE:
+ /* set timer for 3 seconds, we'll abort any unfinished
+ * commands after that expires
+ */
+ skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
+ skdev->timer_countdown = SKD_TIMER_SECONDS(3);
+ skd_start_queue(skdev);
+ break;
+ case FIT_SR_DRIVE_BUSY_ERASE:
+ skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
+ skdev->timer_countdown = SKD_BUSY_TIMO;
+ break;
+ case FIT_SR_DRIVE_OFFLINE:
+ skdev->state = SKD_DRVR_STATE_IDLE;
+ break;
+ case FIT_SR_DRIVE_SOFT_RESET:
+ switch (skdev->state) {
+ case SKD_DRVR_STATE_STARTING:
+ case SKD_DRVR_STATE_RESTARTING:
+ /* Expected by a caller of skd_soft_reset() */
+ break;
+ default:
+ skdev->state = SKD_DRVR_STATE_RESTARTING;
+ break;
+ }
+ break;
+ case FIT_SR_DRIVE_FW_BOOTING:
+ VPRINTK(skdev, "ISR FIT_SR_DRIVE_FW_BOOTING %s\n", skdev->name);
+ skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
+ skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
+ break;
+
+ case FIT_SR_DRIVE_DEGRADED:
+ case FIT_SR_PCIE_LINK_DOWN:
+ case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
+ break;
+
+ case FIT_SR_DRIVE_FAULT:
+ skd_drive_fault(skdev);
+ skd_recover_requests(skdev, 0);
+ skd_start_queue(skdev);
+ break;
+
+ /* PCIe bus returned all Fs? */
+ case 0xFF:
+ pr_info("(%s): state=0x%x sense=0x%x\n",
+ skd_name(skdev), state, sense);
+ skd_drive_disappeared(skdev);
+ skd_recover_requests(skdev, 0);
+ skd_start_queue(skdev);
+ break;
+ default:
+ /*
+ * Uknown FW State. Wait for a state we recognize.
+ */
+ break;
+ }
+ pr_err("(%s): Driver state %s(%d)=>%s(%d)\n",
+ skd_name(skdev),
+ skd_skdev_state_to_str(prev_driver_state), prev_driver_state,
+ skd_skdev_state_to_str(skdev->state), skdev->state);
+}
+
+static void skd_recover_requests(struct skd_device *skdev, int requeue)
+{
+ int i;
+
+ for (i = 0; i < skdev->num_req_context; i++) {
+ struct skd_request_context *skreq = &skdev->skreq_table[i];
+
+ if (skreq->state == SKD_REQ_STATE_BUSY) {
+ skd_log_skreq(skdev, skreq, "recover");
+
+ SKD_ASSERT((skreq->id & SKD_ID_INCR) != 0);
+ if (!skd_bio)
+ SKD_ASSERT(skreq->req != NULL);
+ else
+ SKD_ASSERT(skreq->bio != NULL);
+
+ /* Release DMA resources for the request. */
+ if (skreq->n_sg > 0)
+ skd_postop_sg_list(skdev, skreq);
+
+ if (!skd_bio) {
+ if (requeue &&
+ (unsigned long) ++skreq->req->special <
+ SKD_MAX_RETRIES)
+ skd_requeue_request(skdev, skreq);
+ else
+ skd_end_request(skdev, skreq, -EIO);
+ } else
+ skd_end_request(skdev, skreq, -EIO);
+
+ if (!skd_bio)
+ skreq->req = NULL;
+ else
+ skreq->bio = NULL;
+
+ skreq->state = SKD_REQ_STATE_IDLE;
+ skreq->id += SKD_ID_INCR;
+
+
+ }
+ if (i > 0)
+ skreq[-1].next = skreq;
+ skreq->next = NULL;
+ }
+ skdev->skreq_free_list = skdev->skreq_table;
+
+ for (i = 0; i < skdev->num_fitmsg_context; i++) {
+ struct skd_fitmsg_context *skmsg = &skdev->skmsg_table[i];
+
+ if (skmsg->state == SKD_MSG_STATE_BUSY) {
+ skd_log_skmsg(skdev, skmsg, "salvaged");
+ SKD_ASSERT((skmsg->id & SKD_ID_INCR) != 0);
+ skmsg->state = SKD_MSG_STATE_IDLE;
+ skmsg->id += SKD_ID_INCR;
+ }
+ if (i > 0)
+ skmsg[-1].next = skmsg;
+ skmsg->next = NULL;
+ }
+ skdev->skmsg_free_list = skdev->skmsg_table;
+
+ for (i = 0; i < skdev->n_special; i++) {
+ struct skd_special_context *skspcl = &skdev->skspcl_table[i];
+
+ /* If orphaned, reclaim it because it has already been reported
+ * to the process as an error (it was just waiting for
+ * a completion that didn't come, and now it will never come)
+ * If busy, change to a state that will cause it to error
+ * out in the wait routine and let it do the normal
+ * reporting and reclaiming
+ */
+ if (skspcl->req.state == SKD_REQ_STATE_BUSY) {
+ if (skspcl->orphaned) {
+ DPRINTK(skdev, "orphaned %p\n", skspcl);
+ skd_release_special(skdev, skspcl);
+ } else {
+ DPRINTK(skdev, "not orphaned %p\n", skspcl);
+ skspcl->req.state = SKD_REQ_STATE_ABORTED;
+ }
+ }
+ }
+ skdev->skspcl_free_list = skdev->skspcl_table;
+
+ for (i = 0; i < SKD_N_TIMEOUT_SLOT; i++)
+ skdev->timeout_slot[i] = 0;
+
+ skdev->in_flight = 0;
+}
+
+static void skd_isr_msg_from_dev(struct skd_device *skdev)
+{
+ u32 mfd;
+ u32 mtd;
+ u32 data;
+
+ mfd = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
+
+ DPRINTK(skdev, "mfd=0x%x last_mtd=0x%x\n", mfd, skdev->last_mtd);
+
+ /* ignore any mtd that is an ack for something we didn't send */
+ if (FIT_MXD_TYPE(mfd) != FIT_MXD_TYPE(skdev->last_mtd))
+ return;
+
+ switch (FIT_MXD_TYPE(mfd)) {
+ case FIT_MTD_FITFW_INIT:
+ skdev->proto_ver = FIT_PROTOCOL_MAJOR_VER(mfd);
+
+ if (skdev->proto_ver != FIT_PROTOCOL_VERSION_1) {
+ pr_err("(%s): protocol mismatch\n",
+ skdev->name);
+ pr_err("(%s): got=%d support=%d\n",
+ skdev->name, skdev->proto_ver,
+ FIT_PROTOCOL_VERSION_1);
+ pr_err("(%s): please upgrade driver\n",
+ skdev->name);
+ skdev->state = SKD_DRVR_STATE_PROTOCOL_MISMATCH;
+ skd_soft_reset(skdev);
+ break;
+ }
+ mtd = FIT_MXD_CONS(FIT_MTD_GET_CMDQ_DEPTH, 0, 0);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_GET_CMDQ_DEPTH:
+ skdev->dev_max_queue_depth = FIT_MXD_DATA(mfd);
+ mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_DEPTH, 0,
+ SKD_N_COMPLETION_ENTRY);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_SET_COMPQ_DEPTH:
+ SKD_WRITEQ(skdev, skdev->cq_dma_address, FIT_MSG_TO_DEVICE_ARG);
+ mtd = FIT_MXD_CONS(FIT_MTD_SET_COMPQ_ADDR, 0, 0);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_SET_COMPQ_ADDR:
+ skd_reset_skcomp(skdev);
+ mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_HOST_ID, 0, skdev->devno);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_CMD_LOG_HOST_ID:
+ skdev->connect_time_stamp = get_seconds();
+ data = skdev->connect_time_stamp & 0xFFFF;
+ mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_LO, 0, data);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_CMD_LOG_TIME_STAMP_LO:
+ skdev->drive_jiffies = FIT_MXD_DATA(mfd);
+ data = (skdev->connect_time_stamp >> 16) & 0xFFFF;
+ mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_HI, 0, data);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+ break;
+
+ case FIT_MTD_CMD_LOG_TIME_STAMP_HI:
+ skdev->drive_jiffies |= (FIT_MXD_DATA(mfd) << 16);
+ mtd = FIT_MXD_CONS(FIT_MTD_ARM_QUEUE, 0, 0);
+ SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE);
+ skdev->last_mtd = mtd;
+
+ pr_err("(%s): Time sync driver=0x%x device=0x%x\n",
+ skd_name(skdev),
+ skdev->connect_time_stamp, skdev->drive_jiffies);
+ break;
+
+ case FIT_MTD_ARM_QUEUE:
+ skdev->last_mtd = 0;
+ /*
+ * State should be, or soon will be, FIT_SR_DRIVE_ONLINE.
+ */
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void skd_disable_interrupts(struct skd_device *skdev)
+{
+ u32 sense;
+
+ sense = SKD_READL(skdev, FIT_CONTROL);
+ sense &= ~FIT_CR_ENABLE_INTERRUPTS;
+ SKD_WRITEL(skdev, sense, FIT_CONTROL);
+ DPRINTK(skdev, "sense 0x%x\n", sense);
+
+ /* Note that the 1s is written. A 1-bit means
+ * disable, a 0 means enable.
+ */
+ SKD_WRITEL(skdev, ~0, FIT_INT_MASK_HOST);
+}
+
+static void skd_enable_interrupts(struct skd_device *skdev)
+{
+ u32 val;
+
+ /* unmask interrupts first */
+ val = FIT_ISH_FW_STATE_CHANGE +
+ FIT_ISH_COMPLETION_POSTED + FIT_ISH_MSG_FROM_DEV;
+
+ /* Note that the compliment of mask is written. A 1-bit means
+ * disable, a 0 means enable. */
+ SKD_WRITEL(skdev, ~val, FIT_INT_MASK_HOST);
+ DPRINTK(skdev, "interrupt mask=0x%x\n", ~val);
+
+ val = SKD_READL(skdev, FIT_CONTROL);
+ val |= FIT_CR_ENABLE_INTERRUPTS;
+ DPRINTK(skdev, "control=0x%x\n", val);
+ SKD_WRITEL(skdev, val, FIT_CONTROL);
+}
+
+/*
+ *****************************************************************************
+ * START, STOP, RESTART, QUIESCE, UNQUIESCE
+ *****************************************************************************
+ */
+
+static void skd_soft_reset(struct skd_device *skdev)
+{
+ u32 val;
+
+ val = SKD_READL(skdev, FIT_CONTROL);
+ val |= (FIT_CR_SOFT_RESET);
+ DPRINTK(skdev, "control=0x%x\n", val);
+ SKD_WRITEL(skdev, val, FIT_CONTROL);
+}
+
+static void skd_start_device(struct skd_device *skdev)
+{
+ unsigned long flags;
+ u32 sense;
+ u32 state;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+
+ /* ack all ghost interrupts */
+ SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
+
+ sense = SKD_READL(skdev, FIT_STATUS);
+
+ DPRINTK(skdev, "initial status=0x%x\n", sense);
+
+ state = sense & FIT_SR_DRIVE_STATE_MASK;
+ skdev->drive_state = state;
+ skdev->last_mtd = 0;
+
+ skdev->state = SKD_DRVR_STATE_STARTING;
+ skdev->timer_countdown = SKD_STARTING_TIMO;
+
+ skd_enable_interrupts(skdev);
+
+ switch (skdev->drive_state) {
+ case FIT_SR_DRIVE_OFFLINE:
+ pr_err("(%s): Drive offline...\n", skd_name(skdev));
+ break;
+
+ case FIT_SR_DRIVE_FW_BOOTING:
+ VPRINTK(skdev, "FIT_SR_DRIVE_FW_BOOTING %s\n", skdev->name);
+ skdev->state = SKD_DRVR_STATE_WAIT_BOOT;
+ skdev->timer_countdown = SKD_WAIT_BOOT_TIMO;
+ break;
+
+ case FIT_SR_DRIVE_BUSY_SANITIZE:
+ pr_info("(%s): Start: BUSY_SANITIZE\n",
+ skd_name(skdev));
+ skdev->state = SKD_DRVR_STATE_BUSY_SANITIZE;
+ skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
+ break;
+
+ case FIT_SR_DRIVE_BUSY_ERASE:
+ pr_info("(%s): Start: BUSY_ERASE\n", skd_name(skdev));
+ skdev->state = SKD_DRVR_STATE_BUSY_ERASE;
+ skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
+ break;
+
+ case FIT_SR_DRIVE_INIT:
+ case FIT_SR_DRIVE_ONLINE:
+ skd_soft_reset(skdev);
+ break;
+
+ case FIT_SR_DRIVE_BUSY:
+ pr_err("(%s): Drive Busy...\n", skd_name(skdev));
+ skdev->state = SKD_DRVR_STATE_BUSY;
+ skdev->timer_countdown = SKD_STARTED_BUSY_TIMO;
+ break;
+
+ case FIT_SR_DRIVE_SOFT_RESET:
+ pr_err("(%s) drive soft reset in prog\n",
+ skd_name(skdev));
+ break;
+
+ case FIT_SR_DRIVE_FAULT:
+ /* Fault state is bad...soft reset won't do it...
+ * Hard reset, maybe, but does it work on device?
+ * For now, just fault so the system doesn't hang.
+ */
+ skd_drive_fault(skdev);
+ /*start the queue so we can respond with error to requests */
+ VPRINTK(skdev, "starting %s queue\n", skdev->name);
+ skd_start_queue(skdev);
+ skdev->gendisk_on = -1;
+ wake_up_interruptible(&skdev->waitq);
+ break;
+
+ case 0xFF:
+ /* Most likely the device isn't there or isn't responding
+ * to the BAR1 addresses. */
+ skd_drive_disappeared(skdev);
+ /*start the queue so we can respond with error to requests */
+ VPRINTK(skdev, "starting %s queue to error-out reqs\n",
+ skdev->name);
+ skd_start_queue(skdev);
+ skdev->gendisk_on = -1;
+ wake_up_interruptible(&skdev->waitq);
+ break;
+
+ default:
+ pr_err("(%s) Start: unknown state %x\n",
+ skd_name(skdev), skdev->drive_state);
+ break;
+ }
+
+ state = SKD_READL(skdev, FIT_CONTROL);
+ DPRINTK(skdev, "FIT Control Status=0x%x\n", state);
+
+ state = SKD_READL(skdev, FIT_INT_STATUS_HOST);
+ DPRINTK(skdev, "Intr Status=0x%x\n", state);
+
+ state = SKD_READL(skdev, FIT_INT_MASK_HOST);
+ DPRINTK(skdev, "Intr Mask=0x%x\n", state);
+
+ state = SKD_READL(skdev, FIT_MSG_FROM_DEVICE);
+ DPRINTK(skdev, "Msg from Dev=0x%x\n", state);
+
+ state = SKD_READL(skdev, FIT_HW_VERSION);
+ DPRINTK(skdev, "HW version=0x%x\n", state);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+}
+
+static void skd_stop_device(struct skd_device *skdev)
+{
+ unsigned long flags;
+ struct skd_special_context *skspcl = &skdev->internal_skspcl;
+ u32 dev_state;
+ int i;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+
+ if (skdev->state != SKD_DRVR_STATE_ONLINE) {
+ pr_err("(%s): skd_stop_device not online no sync\n",
+ skd_name(skdev));
+ goto stop_out;
+ }
+
+ if (skspcl->req.state != SKD_REQ_STATE_IDLE) {
+ pr_err("(%s): skd_stop_device no special\n",
+ skd_name(skdev));
+ goto stop_out;
+ }
+
+ skdev->state = SKD_DRVR_STATE_SYNCING;
+ skdev->sync_done = 0;
+
+ skd_send_internal_skspcl(skdev, skspcl, SYNCHRONIZE_CACHE);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+ wait_event_interruptible_timeout(skdev->waitq,
+ (skdev->sync_done), (10 * HZ));
+
+ spin_lock_irqsave(&skdev->lock, flags);
+
+ switch (skdev->sync_done) {
+ case 0:
+ pr_err("(%s): skd_stop_device no sync\n",
+ skd_name(skdev));
+ break;
+ case 1:
+ pr_err("(%s): skd_stop_device sync done\n",
+ skd_name(skdev));
+ break;
+ default:
+ pr_err("(%s): skd_stop_device sync error\n",
+ skd_name(skdev));
+ }
+
+stop_out:
+ skdev->state = SKD_DRVR_STATE_STOPPING;
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+ skd_kill_timer(skdev);
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ skd_disable_interrupts(skdev);
+
+ /* ensure all ints on device are cleared */
+ /* soft reset the device to unload with a clean slate */
+ SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
+ SKD_WRITEL(skdev, FIT_CR_SOFT_RESET, FIT_CONTROL);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+ /* poll every 100ms, 1 second timeout */
+ for (i = 0; i < 10; i++) {
+ dev_state =
+ SKD_READL(skdev, FIT_STATUS) & FIT_SR_DRIVE_STATE_MASK;
+ if (dev_state == FIT_SR_DRIVE_INIT)
+ break;
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(msecs_to_jiffies(100));
+ }
+
+ if (dev_state != FIT_SR_DRIVE_INIT)
+ pr_err("(%s): skd_stop_device state error 0x%02x\n",
+ skd_name(skdev), dev_state);
+}
+
+/* assume spinlock is held */
+static void skd_restart_device(struct skd_device *skdev)
+{
+ u32 state;
+
+ /* ack all ghost interrupts */
+ SKD_WRITEL(skdev, FIT_INT_DEF_MASK, FIT_INT_STATUS_HOST);
+
+ state = SKD_READL(skdev, FIT_STATUS);
+
+ DPRINTK(skdev, "drive status=0x%x\n", state);
+
+ state &= FIT_SR_DRIVE_STATE_MASK;
+ skdev->drive_state = state;
+ skdev->last_mtd = 0;
+
+ skdev->state = SKD_DRVR_STATE_RESTARTING;
+ skdev->timer_countdown = SKD_RESTARTING_TIMO;
+
+ skd_soft_reset(skdev);
+}
+
+/* assume spinlock is held */
+static int skd_quiesce_dev(struct skd_device *skdev)
+{
+ int rc = 0;
+
+ switch (skdev->state) {
+ case SKD_DRVR_STATE_BUSY:
+ case SKD_DRVR_STATE_BUSY_IMMINENT:
+ VPRINTK(skdev, "stopping %s queue\n", skdev->name);
+ skd_stop_queue(skdev);
+ break;
+ case SKD_DRVR_STATE_ONLINE:
+ case SKD_DRVR_STATE_STOPPING:
+ case SKD_DRVR_STATE_SYNCING:
+ case SKD_DRVR_STATE_PAUSING:
+ case SKD_DRVR_STATE_PAUSED:
+ case SKD_DRVR_STATE_STARTING:
+ case SKD_DRVR_STATE_RESTARTING:
+ case SKD_DRVR_STATE_RESUMING:
+ default:
+ rc = -EINVAL;
+ VPRINTK(skdev, "state [%d] not implemented\n", skdev->state);
+ }
+ return rc;
+}
+
+/* assume spinlock is held */
+static int skd_unquiesce_dev(struct skd_device *skdev)
+{
+ int prev_driver_state = skdev->state;
+
+ skd_log_skdev(skdev, "unquiesce");
+ if (skdev->state == SKD_DRVR_STATE_ONLINE) {
+ DPRINTK(skdev, "**** device already ONLINE\n");
+ return 0;
+ }
+ if (skdev->drive_state != FIT_SR_DRIVE_ONLINE) {
+ /*
+ * If there has been an state change to other than
+ * ONLINE, we will rely on controller state change
+ * to come back online and restart the queue.
+ * The BUSY state means that driver is ready to
+ * continue normal processing but waiting for controller
+ * to become available.
+ */
+ skdev->state = SKD_DRVR_STATE_BUSY;
+ DPRINTK(skdev, "drive BUSY state\n");
+ return 0;
+ }
+
+ /*
+ * Drive has just come online, driver is either in startup,
+ * paused performing a task, or bust waiting for hardware.
+ */
+ switch (skdev->state) {
+ case SKD_DRVR_STATE_PAUSED:
+ case SKD_DRVR_STATE_BUSY:
+ case SKD_DRVR_STATE_BUSY_IMMINENT:
+ case SKD_DRVR_STATE_BUSY_ERASE:
+ case SKD_DRVR_STATE_STARTING:
+ case SKD_DRVR_STATE_RESTARTING:
+ case SKD_DRVR_STATE_FAULT:
+ case SKD_DRVR_STATE_IDLE:
+ case SKD_DRVR_STATE_LOAD:
+ skdev->state = SKD_DRVR_STATE_ONLINE;
+ pr_err("(%s): Driver state %s(%d)=>%s(%d)\n",
+ skd_name(skdev),
+ skd_skdev_state_to_str(prev_driver_state),
+ prev_driver_state, skd_skdev_state_to_str(skdev->state),
+ skdev->state);
+ DPRINTK(skdev, "**** device ONLINE...starting block queue\n");
+ VPRINTK(skdev, "starting %s queue\n", skdev->name);
+ pr_info("(%s): STEC s1120 ONLINE\n", skd_name(skdev));
+ skd_start_queue(skdev);
+ skdev->gendisk_on = 1;
+ wake_up_interruptible(&skdev->waitq);
+ break;
+
+ case SKD_DRVR_STATE_DISAPPEARED:
+ default:
+ DPRINTK(skdev, "**** driver state %d, not implemented \n",
+ skdev->state);
+ return -EBUSY;
+ }
+ return 0;
+}
+
+/*
+ *****************************************************************************
+ * PCIe MSI/MSI-X INTERRUPT HANDLERS
+ *****************************************************************************
+ */
+
+static irqreturn_t skd_reserved_isr(int irq, void *skd_host_data)
+{
+ struct skd_device *skdev = skd_host_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ pr_err("(%s): MSIX reserved irq %d = 0x%x\n", skd_name(skdev),
+ irq, SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ SKD_WRITEL(skdev, FIT_INT_RESERVED_MASK, FIT_INT_STATUS_HOST);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t skd_statec_isr(int irq, void *skd_host_data)
+{
+ struct skd_device *skdev = skd_host_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ SKD_WRITEL(skdev, FIT_ISH_FW_STATE_CHANGE, FIT_INT_STATUS_HOST);
+ skd_isr_fwstate(skdev);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t skd_comp_q(int irq, void *skd_host_data)
+{
+ struct skd_device *skdev = skd_host_data;
+ unsigned long flags;
+ int flush_enqueued = 0;
+ int deferred;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ SKD_WRITEL(skdev, FIT_ISH_COMPLETION_POSTED, FIT_INT_STATUS_HOST);
+ deferred = skd_isr_completion_posted(skdev, skd_isr_comp_limit,
+ &flush_enqueued);
+
+ if (flush_enqueued)
+ skd_request_fn(skdev->queue);
+
+ if (deferred)
+ schedule_work(&skdev->completion_worker);
+ else if (!flush_enqueued)
+ skd_request_fn(skdev->queue);
+
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t skd_msg_isr(int irq, void *skd_host_data)
+{
+ struct skd_device *skdev = skd_host_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ SKD_WRITEL(skdev, FIT_ISH_MSG_FROM_DEV, FIT_INT_STATUS_HOST);
+ skd_isr_msg_from_dev(skdev);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t skd_qfull_isr(int irq, void *skd_host_data)
+{
+ struct skd_device *skdev = skd_host_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ VPRINTK(skdev, "MSIX = 0x%x\n", SKD_READL(skdev, FIT_INT_STATUS_HOST));
+ SKD_WRITEL(skdev, FIT_INT_QUEUE_FULL, FIT_INT_STATUS_HOST);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+ return IRQ_HANDLED;
+}
+
+/*
+ *****************************************************************************
+ * PCIe MSI/MSI-X SETUP
+ *****************************************************************************
+ */
+
+struct skd_msix_entry {
+ int have_irq;
+ u32 vector;
+ u32 entry;
+ struct skd_device *rsp;
+ char isr_name[30];
+};
+
+struct skd_init_msix_entry {
+ const char *name;
+ irq_handler_t handler;
+};
+
+#define SKD_MAX_MSIX_COUNT 13
+#define SKD_MIN_MSIX_COUNT 7
+#define SKD_BASE_MSIX_IRQ 4
+
+static struct skd_init_msix_entry msix_entries[SKD_MAX_MSIX_COUNT] = {
+ { "(DMA 0)", skd_reserved_isr },
+ { "(DMA 1)", skd_reserved_isr },
+ { "(DMA 2)", skd_reserved_isr },
+ { "(DMA 3)", skd_reserved_isr },
+ { "(State Change)", skd_statec_isr },
+ { "(COMPL_Q)", skd_comp_q },
+ { "(MSG)", skd_msg_isr },
+ { "(Reserved)", skd_reserved_isr },
+ { "(Reserved)", skd_reserved_isr },
+ { "(Queue Full 0)", skd_qfull_isr },
+ { "(Queue Full 1)", skd_qfull_isr },
+ { "(Queue Full 2)", skd_qfull_isr },
+ { "(Queue Full 3)", skd_qfull_isr },
+};
+
+static void skd_release_msix(struct skd_device *skdev)
+{
+ struct skd_msix_entry *qentry;
+ int i;
+
+ if (skdev->msix_entries == NULL)
+ return;
+ for (i = 0; i < skdev->msix_count; i++) {
+ qentry = &skdev->msix_entries[i];
+ skdev = qentry->rsp;
+
+ if (qentry->have_irq)
+ devm_free_irq(&skdev->pdev->dev,
+ qentry->vector, qentry->rsp);
+ }
+ pci_disable_msix(skdev->pdev);
+ kfree(skdev->msix_entries);
+ skdev->msix_count = 0;
+ skdev->msix_entries = NULL;
+}
+
+static int skd_acquire_msix(struct skd_device *skdev)
+{
+ int i, rc;
+ struct pci_dev *pdev;
+ struct msix_entry *entries = NULL;
+ struct skd_msix_entry *qentry;
+
+ pdev = skdev->pdev;
+ skdev->msix_count = SKD_MAX_MSIX_COUNT;
+ entries = kzalloc(sizeof(struct msix_entry) * SKD_MAX_MSIX_COUNT,
+ GFP_KERNEL);
+ if (!entries)
+ return -ENOMEM;
+
+ for (i = 0; i < SKD_MAX_MSIX_COUNT; i++)
+ entries[i].entry = i;
+
+ rc = pci_enable_msix(pdev, entries, SKD_MAX_MSIX_COUNT);
+ if (rc < 0)
+ goto msix_out;
+ if (rc) {
+ if (rc < SKD_MIN_MSIX_COUNT) {
+ pr_err("(%s): failed to enable MSI-X %d\n",
+ skd_name(skdev), rc);
+ goto msix_out;
+ }
+ DPRINTK(skdev, "%s: <%s> allocated %d MSI-X vectors\n",
+ pci_name(pdev), skdev->name, rc);
+
+ skdev->msix_count = rc;
+ rc = pci_enable_msix(pdev, entries, skdev->msix_count);
+ if (rc) {
+ pr_err("(%s): failed to enable MSI-X "
+ "support (%d) %d\n",
+ skd_name(skdev), skdev->msix_count, rc);
+ goto msix_out;
+ }
+ }
+ skdev->msix_entries = kzalloc(sizeof(struct skd_msix_entry) *
+ skdev->msix_count, GFP_KERNEL);
+ if (!skdev->msix_entries) {
+ rc = -ENOMEM;
+ skdev->msix_count = 0;
+ pr_err("(%s): msix table allocation error\n",
+ skd_name(skdev));
+ goto msix_out;
+ }
+
+ qentry = skdev->msix_entries;
+ for (i = 0; i < skdev->msix_count; i++) {
+ qentry->vector = entries[i].vector;
+ qentry->entry = entries[i].entry;
+ qentry->rsp = NULL;
+ qentry->have_irq = 0;
+ DPRINTK(skdev, "%s: <%s> msix (%d) vec %d, entry %x\n",
+ pci_name(pdev), skdev->name,
+ i, qentry->vector, qentry->entry);
+ qentry++;
+ }
+
+ /* Enable MSI-X vectors for the base queue */
+ for (i = 0; i < SKD_MAX_MSIX_COUNT; i++) {
+ qentry = &skdev->msix_entries[i];
+ snprintf(qentry->isr_name, sizeof(qentry->isr_name),
+ "%s%d-msix %s", DRV_NAME, skdev->devno,
+ msix_entries[i].name);
+ rc = devm_request_irq(&skdev->pdev->dev, qentry->vector,
+ msix_entries[i].handler, 0,
+ qentry->isr_name, skdev);
+ if (rc) {
+ pr_err("(%s): Unable to register(%d) MSI-X "
+ "handler %d: %s\n",
+ skd_name(skdev), rc, i, qentry->isr_name);
+ goto msix_out;
+ } else {
+ qentry->have_irq = 1;
+ qentry->rsp = skdev;
+ }
+ }
+ DPRINTK(skdev, "%s: <%s> msix %d irq(s) enabled\n",
+ pci_name(pdev), skdev->name, skdev->msix_count);
+ return 0;
+
+msix_out:
+ if (entries)
+ kfree(entries);
+ skd_release_msix(skdev);
+ return rc;
+}
+
+static int skd_acquire_irq(struct skd_device *skdev)
+{
+ int rc;
+ struct pci_dev *pdev;
+
+ pdev = skdev->pdev;
+ skdev->msix_count = 0;
+
+RETRY_IRQ_TYPE:
+ switch (skdev->irq_type) {
+ case SKD_IRQ_MSIX:
+ rc = skd_acquire_msix(skdev);
+ if (!rc)
+ pr_info("(%s): MSI-X %d irqs enabled\n",
+ skd_name(skdev), skdev->msix_count);
+ else {
+ pr_err(
+ "(%s): failed to enable MSI-X, re-trying with MSI %d\n",
+ skd_name(skdev), rc);
+ skdev->irq_type = SKD_IRQ_MSI;
+ goto RETRY_IRQ_TYPE;
+ }
+ break;
+ case SKD_IRQ_MSI:
+ snprintf(skdev->isr_name, sizeof(skdev->isr_name), "%s%d-msi",
+ DRV_NAME, skdev->devno);
+ rc = pci_enable_msi(pdev);
+ if (!rc) {
+ rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr, 0,
+ skdev->isr_name, skdev);
+ if (rc) {
+ pci_disable_msi(pdev);
+ pr_err(
+ "(%s): failed to allocate the MSI interrupt %d\n",
+ skd_name(skdev), rc);
+ goto RETRY_IRQ_LEGACY;
+ }
+ pr_info("(%s): MSI irq %d enabled\n",
+ skd_name(skdev), pdev->irq);
+ } else {
+RETRY_IRQ_LEGACY:
+ pr_err(
+ "(%s): failed to enable MSI, re-trying with LEGACY %d\n",
+ skd_name(skdev), rc);
+ skdev->irq_type = SKD_IRQ_LEGACY;
+ goto RETRY_IRQ_TYPE;
+ }
+ break;
+ case SKD_IRQ_LEGACY:
+ snprintf(skdev->isr_name, sizeof(skdev->isr_name),
+ "%s%d-legacy", DRV_NAME, skdev->devno);
+ rc = devm_request_irq(&pdev->dev, pdev->irq, skd_isr,
+ IRQF_SHARED, skdev->isr_name, skdev);
+ if (!rc)
+ pr_info("(%s): LEGACY irq %d enabled\n",
+ skd_name(skdev), pdev->irq);
+ else
+ pr_err("(%s): request LEGACY irq error %d\n",
+ skd_name(skdev), rc);
+ break;
+ default:
+ pr_info("(%s): irq_type %d invalid, re-set to %d\n",
+ skd_name(skdev), skdev->irq_type, SKD_IRQ_DEFAULT);
+ skdev->irq_type = SKD_IRQ_LEGACY;
+ goto RETRY_IRQ_TYPE;
+ }
+ return rc;
+}
+
+static void skd_release_irq(struct skd_device *skdev)
+{
+ switch (skdev->irq_type) {
+ case SKD_IRQ_MSIX:
+ skd_release_msix(skdev);
+ break;
+ case SKD_IRQ_MSI:
+ devm_free_irq(&skdev->pdev->dev, skdev->pdev->irq, skdev);
+ pci_disable_msi(skdev->pdev);
+ break;
+ case SKD_IRQ_LEGACY:
+ devm_free_irq(&skdev->pdev->dev, skdev->pdev->irq, skdev);
+ break;
+ default:
+ pr_err("(%s): wrong irq type %d!",
+ skd_name(skdev), skdev->irq_type);
+ break;
+ }
+}
+
+/*
+ *****************************************************************************
+ * CONSTRUCT
+ *****************************************************************************
+ */
+
+static int skd_cons_skcomp(struct skd_device *skdev);
+static int skd_cons_skmsg(struct skd_device *skdev);
+static int skd_cons_skreq(struct skd_device *skdev);
+static int skd_cons_skspcl(struct skd_device *skdev);
+static int skd_cons_sksb(struct skd_device *skdev);
+static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
+ u32 n_sg,
+ dma_addr_t *ret_dma_addr);
+static int skd_cons_disk(struct skd_device *skdev);
+
+#define SKD_N_DEV_TABLE 16u
+static u32 skd_next_devno;
+
+static struct skd_device *skd_construct(struct pci_dev *pdev)
+{
+ struct skd_device *skdev;
+ int blk_major = skd_major;
+ int rc;
+
+ skdev = kzalloc(sizeof(*skdev), GFP_KERNEL);
+
+ if (!skdev) {
+ pr_err(PFX "(%s): memory alloc failure\n",
+ pci_name(pdev));
+ return NULL;
+ }
+
+ skdev->state = SKD_DRVR_STATE_LOAD;
+ skdev->pdev = pdev;
+ skdev->devno = skd_next_devno++;
+ skdev->major = blk_major;
+ skdev->irq_type = skd_isr_type;
+ sprintf(skdev->name, DRV_NAME "%d", skdev->devno);
+ skdev->dev_max_queue_depth = 0;
+
+ skdev->num_req_context = skd_max_queue_depth;
+ skdev->num_fitmsg_context = skd_max_queue_depth;
+ skdev->n_special = skd_max_pass_thru;
+ skdev->cur_max_queue_depth = 1;
+ skdev->queue_low_water_mark = 1;
+ skdev->proto_ver = 99;
+ skdev->sgs_per_request = skd_sgs_per_request;
+ skdev->dbg_level = skd_dbg_level;
+
+ if (skd_bio)
+ bio_list_init(&skdev->bio_queue);
+
+
+ atomic_set(&skdev->device_count, 0);
+
+ spin_lock_init(&skdev->lock);
+
+ INIT_WORK(&skdev->completion_worker, skd_completion_worker);
+ INIT_LIST_HEAD(&skdev->flush_list);
+
+ VPRINTK(skdev, "skcomp\n");
+ rc = skd_cons_skcomp(skdev);
+ if (rc < 0)
+ goto err_out;
+
+ VPRINTK(skdev, "skmsg\n");
+ rc = skd_cons_skmsg(skdev);
+ if (rc < 0)
+ goto err_out;
+
+ VPRINTK(skdev, "skreq\n");
+ rc = skd_cons_skreq(skdev);
+ if (rc < 0)
+ goto err_out;
+
+ VPRINTK(skdev, "skspcl\n");
+ rc = skd_cons_skspcl(skdev);
+ if (rc < 0)
+ goto err_out;
+
+ VPRINTK(skdev, "sksb\n");
+ rc = skd_cons_sksb(skdev);
+ if (rc < 0)
+ goto err_out;
+
+ VPRINTK(skdev, "disk\n");
+ rc = skd_cons_disk(skdev);
+ if (rc < 0)
+ goto err_out;
+
+
+
+ DPRINTK(skdev, "VICTORY\n");
+ return skdev;
+
+err_out:
+ DPRINTK(skdev, "construct failed\n");
+ skd_destruct(skdev);
+ return NULL;
+}
+
+static int skd_cons_skcomp(struct skd_device *skdev)
+{
+ int rc = 0;
+ struct fit_completion_entry_v1 *skcomp;
+ u32 nbytes;
+
+ nbytes = sizeof(*skcomp) * SKD_N_COMPLETION_ENTRY;
+ nbytes += sizeof(struct fit_comp_error_info) * SKD_N_COMPLETION_ENTRY;
+
+ VPRINTK(skdev, "comp pci_alloc, total bytes %d entries %d\n", nbytes,
+ SKD_N_COMPLETION_ENTRY);
+
+ skcomp = pci_alloc_consistent(skdev->pdev, nbytes,
+ &skdev->cq_dma_address);
+
+ if (skcomp == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ memset(skcomp, 0, nbytes);
+
+ skdev->skcomp_table = skcomp;
+ skdev->skerr_table = (struct fit_comp_error_info *)((char *)skcomp +
+ sizeof(*skcomp) *
+ SKD_N_COMPLETION_ENTRY);
+
+err_out:
+ return rc;
+}
+
+static int skd_cons_skmsg(struct skd_device *skdev)
+{
+ int rc = 0;
+ u32 i;
+
+ VPRINTK(skdev, "skmsg_table kzalloc, struct %lu, count %u total %lu\n",
+ sizeof(struct skd_fitmsg_context),
+ skdev->num_fitmsg_context,
+ sizeof(struct skd_fitmsg_context) * skdev->num_fitmsg_context);
+
+ skdev->skmsg_table = kzalloc(sizeof(struct skd_fitmsg_context)
+ *skdev->num_fitmsg_context, GFP_KERNEL);
+ if (skdev->skmsg_table == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ for (i = 0; i < skdev->num_fitmsg_context; i++) {
+ struct skd_fitmsg_context *skmsg;
+
+ skmsg = &skdev->skmsg_table[i];
+
+ skmsg->id = i + SKD_ID_FIT_MSG;
+
+ skmsg->state = SKD_MSG_STATE_IDLE;
+ skmsg->msg_buf = pci_alloc_consistent(skdev->pdev,
+ SKD_N_FITMSG_BYTES + 64,
+ &skmsg->mb_dma_address);
+
+ if (skmsg->msg_buf == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ skmsg->offset = (u32)((u64)skmsg->msg_buf &
+ (~FIT_QCMD_BASE_ADDRESS_MASK));
+ skmsg->msg_buf += ~FIT_QCMD_BASE_ADDRESS_MASK;
+ skmsg->msg_buf = (u8 *)((u64)skmsg->msg_buf &
+ FIT_QCMD_BASE_ADDRESS_MASK);
+ skmsg->mb_dma_address += ~FIT_QCMD_BASE_ADDRESS_MASK;
+ skmsg->mb_dma_address &= FIT_QCMD_BASE_ADDRESS_MASK;
+ memset(skmsg->msg_buf, 0, SKD_N_FITMSG_BYTES);
+
+ skmsg->next = &skmsg[1];
+ }
+
+ /* Free list is in order starting with the 0th entry. */
+ skdev->skmsg_table[i - 1].next = NULL;
+ skdev->skmsg_free_list = skdev->skmsg_table;
+
+err_out:
+ return rc;
+}
+
+static int skd_cons_skreq(struct skd_device *skdev)
+{
+ int rc = 0;
+ u32 i;
+
+ VPRINTK(skdev, "skreq_table kzalloc, struct %lu, count %u total %lu\n",
+ sizeof(struct skd_request_context),
+ skdev->num_req_context,
+ sizeof(struct skd_request_context) * skdev->num_req_context);
+
+ skdev->skreq_table = kzalloc(sizeof(struct skd_request_context)
+ * skdev->num_req_context, GFP_KERNEL);
+ if (skdev->skreq_table == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ VPRINTK(skdev, "alloc sg_table sg_per_req %u scatlist %lu total %lu\n",
+ skdev->sgs_per_request, sizeof(struct scatterlist),
+ skdev->sgs_per_request * sizeof(struct scatterlist));
+
+ for (i = 0; i < skdev->num_req_context; i++) {
+ struct skd_request_context *skreq;
+
+ skreq = &skdev->skreq_table[i];
+
+ skreq->id = i + SKD_ID_RW_REQUEST;
+ skreq->state = SKD_REQ_STATE_IDLE;
+
+ skreq->sg = kzalloc(sizeof(struct scatterlist) *
+ skdev->sgs_per_request, GFP_KERNEL);
+ if (skreq->sg == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+ sg_init_table(skreq->sg, skdev->sgs_per_request);
+
+ skreq->sksg_list = skd_cons_sg_list(skdev,
+ skdev->sgs_per_request,
+ &skreq->sksg_dma_address);
+
+ if (skreq->sksg_list == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ skreq->next = &skreq[1];
+ }
+
+ /* Free list is in order starting with the 0th entry. */
+ skdev->skreq_table[i - 1].next = NULL;
+ skdev->skreq_free_list = skdev->skreq_table;
+
+err_out:
+ return rc;
+}
+
+static int skd_cons_skspcl(struct skd_device *skdev)
+{
+ int rc = 0;
+ u32 i, nbytes;
+
+ VPRINTK(skdev, "skspcl_table kzalloc, struct %lu, count %u total %lu\n",
+ sizeof(struct skd_special_context),
+ skdev->n_special,
+ sizeof(struct skd_special_context) * skdev->n_special);
+
+ skdev->skspcl_table = kzalloc(sizeof(struct skd_special_context)
+ * skdev->n_special, GFP_KERNEL);
+ if (skdev->skspcl_table == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ for (i = 0; i < skdev->n_special; i++) {
+ struct skd_special_context *skspcl;
+
+ skspcl = &skdev->skspcl_table[i];
+
+ skspcl->req.id = i + SKD_ID_SPECIAL_REQUEST;
+ skspcl->req.state = SKD_REQ_STATE_IDLE;
+
+ skspcl->req.next = &skspcl[1].req;
+
+ nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
+
+ skspcl->msg_buf = pci_alloc_consistent(skdev->pdev, nbytes,
+ &skspcl->mb_dma_address);
+ if (skspcl->msg_buf == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ memset(skspcl->msg_buf, 0, nbytes);
+
+ skspcl->req.sg = kzalloc(sizeof(struct scatterlist) *
+ SKD_N_SG_PER_SPECIAL, GFP_KERNEL);
+ if (skspcl->req.sg == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ skspcl->req.sksg_list = skd_cons_sg_list(skdev,
+ SKD_N_SG_PER_SPECIAL,
+ &skspcl->req.
+ sksg_dma_address);
+ if (skspcl->req.sksg_list == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+ }
+
+ /* Free list is in order starting with the 0th entry. */
+ skdev->skspcl_table[i - 1].req.next = NULL;
+ skdev->skspcl_free_list = skdev->skspcl_table;
+
+ return rc;
+
+err_out:
+ return rc;
+}
+
+static int skd_cons_sksb(struct skd_device *skdev)
+{
+ int rc = 0;
+ struct skd_special_context *skspcl;
+ u32 nbytes;
+
+ skspcl = &skdev->internal_skspcl;
+
+ skspcl->req.id = 0 + SKD_ID_INTERNAL;
+ skspcl->req.state = SKD_REQ_STATE_IDLE;
+
+ nbytes = SKD_N_INTERNAL_BYTES;
+
+ skspcl->data_buf = pci_alloc_consistent(skdev->pdev, nbytes,
+ &skspcl->db_dma_address);
+ if (skspcl->data_buf == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ memset(skspcl->data_buf, 0, nbytes);
+
+ nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
+ skspcl->msg_buf = pci_alloc_consistent(skdev->pdev, nbytes,
+ &skspcl->mb_dma_address);
+ if (skspcl->msg_buf == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ memset(skspcl->msg_buf, 0, nbytes);
+
+ skspcl->req.sksg_list = skd_cons_sg_list(skdev, 1,
+ &skspcl->req.sksg_dma_address);
+ if (skspcl->req.sksg_list == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ if (!skd_format_internal_skspcl(skdev)) {
+ rc = -EINVAL;
+ goto err_out;
+ }
+
+err_out:
+ return rc;
+}
+
+static struct fit_sg_descriptor *skd_cons_sg_list(struct skd_device *skdev,
+ u32 n_sg,
+ dma_addr_t *ret_dma_addr)
+{
+ struct fit_sg_descriptor *sg_list;
+ u32 nbytes;
+
+ nbytes = sizeof(*sg_list) * n_sg;
+
+ sg_list = pci_alloc_consistent(skdev->pdev, nbytes, ret_dma_addr);
+
+ if (sg_list != NULL) {
+ uint64_t dma_address = *ret_dma_addr;
+ u32 i;
+
+ memset(sg_list, 0, nbytes);
+
+ for (i = 0; i < n_sg - 1; i++) {
+ uint64_t ndp_off;
+ ndp_off = (i + 1) * sizeof(struct fit_sg_descriptor);
+
+ sg_list[i].next_desc_ptr = dma_address + ndp_off;
+ }
+ sg_list[i].next_desc_ptr = 0LL;
+ }
+
+ return sg_list;
+}
+
+static int skd_cons_disk(struct skd_device *skdev)
+{
+ int rc = 0;
+ struct gendisk *disk;
+ struct request_queue *q;
+ unsigned long flags;
+
+ disk = alloc_disk(SKD_MINORS_PER_DEVICE);
+ if (!disk) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ skdev->disk = disk;
+ sprintf(disk->disk_name, DRV_NAME "%u", skdev->devno);
+
+ disk->major = skdev->major;
+ disk->first_minor = skdev->devno * SKD_MINORS_PER_DEVICE;
+ disk->fops = &skd_blockdev_ops;
+ disk->private_data = skdev;
+
+ if (!skd_bio) {
+ q = blk_init_queue(skd_request_fn, &skdev->lock);
+ } else {
+ q = blk_alloc_queue(GFP_KERNEL);
+ q->queue_flags = QUEUE_FLAG_IO_STAT | QUEUE_FLAG_STACKABLE;
+ }
+
+ if (!q) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+
+ skdev->queue = q;
+ disk->queue = q;
+ q->queuedata = skdev;
+
+ if (skd_bio) {
+ q->queue_lock = &skdev->lock;
+ blk_queue_make_request(q, skd_make_request);
+ }
+
+ blk_queue_flush(q, REQ_FLUSH | REQ_FUA);
+ blk_queue_max_segments(q, skdev->sgs_per_request);
+ blk_queue_max_hw_sectors(q, SKD_N_MAX_SECTORS);
+
+ /* set sysfs ptimal_io_size to 8K */
+ blk_queue_io_opt(q, 8192);
+
+ /* DISCARD Flag initialization. */
+ q->limits.discard_granularity = 8192;
+ q->limits.discard_alignment = 0;
+ q->limits.max_discard_sectors = UINT_MAX >> 9;
+ q->limits.discard_zeroes_data = 1;
+ queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
+ queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
+
+ spin_lock_irqsave(&skdev->lock, flags);
+ VPRINTK(skdev, "stopping %s queue\n", skdev->name);
+ skd_stop_queue(skdev);
+ spin_unlock_irqrestore(&skdev->lock, flags);
+
+err_out:
+ return rc;
+}
+
+/*
+ *****************************************************************************
+ * DESTRUCT (FREE)
+ *****************************************************************************
+ */
+
+static void skd_free_skcomp(struct skd_device *skdev);
+static void skd_free_skmsg(struct skd_device *skdev);
+static void skd_free_skreq(struct skd_device *skdev);
+static void skd_free_skspcl(struct skd_device *skdev);
+static void skd_free_sksb(struct skd_device *skdev);
+static void skd_free_sg_list(struct skd_device *skdev,
+ struct fit_sg_descriptor *sg_list,
+ u32 n_sg, dma_addr_t dma_addr);
+static void skd_free_disk(struct skd_device *skdev);
+
+static void skd_destruct(struct skd_device *skdev)
+{
+ if (skdev == NULL)
+ return;
+
+
+ VPRINTK(skdev, "disk\n");
+ skd_free_disk(skdev);
+
+ VPRINTK(skdev, "sksb\n");
+ skd_free_sksb(skdev);
+
+ VPRINTK(skdev, "skspcl\n");
+ skd_free_skspcl(skdev);
+
+ VPRINTK(skdev, "skreq\n");
+ skd_free_skreq(skdev);
+
+ VPRINTK(skdev, "skmsg\n");
+ skd_free_skmsg(skdev);
+
+ VPRINTK(skdev, "skcomp\n");
+ skd_free_skcomp(skdev);
+
+ VPRINTK(skdev, "skdev\n");
+ kfree(skdev);
+}
+
+static void skd_free_skcomp(struct skd_device *skdev)
+{
+ if (skdev->skcomp_table != NULL) {
+ u32 nbytes;
+
+ nbytes = sizeof(skdev->skcomp_table[0]) *
+ SKD_N_COMPLETION_ENTRY;
+ pci_free_consistent(skdev->pdev, nbytes,
+ skdev->skcomp_table, skdev->cq_dma_address);
+ }
+
+ skdev->skcomp_table = NULL;
+ skdev->cq_dma_address = 0;
+}
+
+static void skd_free_skmsg(struct skd_device *skdev)
+{
+ u32 i;
+
+ if (skdev->skmsg_table == NULL)
+ return;
+
+ for (i = 0; i < skdev->num_fitmsg_context; i++) {
+ struct skd_fitmsg_context *skmsg;
+
+ skmsg = &skdev->skmsg_table[i];
+
+ if (skmsg->msg_buf != NULL) {
+ skmsg->msg_buf += skmsg->offset;
+ skmsg->mb_dma_address += skmsg->offset;
+ pci_free_consistent(skdev->pdev, SKD_N_FITMSG_BYTES,
+ skmsg->msg_buf,
+ skmsg->mb_dma_address);
+ }
+ skmsg->msg_buf = NULL;
+ skmsg->mb_dma_address = 0;
+ }
+
+ kfree(skdev->skmsg_table);
+ skdev->skmsg_table = NULL;
+}
+
+static void skd_free_skreq(struct skd_device *skdev)
+{
+ u32 i;
+
+ if (skdev->skreq_table == NULL)
+ return;
+
+ for (i = 0; i < skdev->num_req_context; i++) {
+ struct skd_request_context *skreq;
+
+ skreq = &skdev->skreq_table[i];
+
+ skd_free_sg_list(skdev, skreq->sksg_list,
+ skdev->sgs_per_request,
+ skreq->sksg_dma_address);
+
+ skreq->sksg_list = NULL;
+ skreq->sksg_dma_address = 0;
+
+ kfree(skreq->sg);
+ }
+
+ kfree(skdev->skreq_table);
+ skdev->skreq_table = NULL;
+}
+
+static void skd_free_skspcl(struct skd_device *skdev)
+{
+ u32 i;
+ u32 nbytes;
+
+ if (skdev->skspcl_table == NULL)
+ return;
+
+ for (i = 0; i < skdev->n_special; i++) {
+ struct skd_special_context *skspcl;
+
+ skspcl = &skdev->skspcl_table[i];
+
+ if (skspcl->msg_buf != NULL) {
+ nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
+ pci_free_consistent(skdev->pdev, nbytes,
+ skspcl->msg_buf,
+ skspcl->mb_dma_address);
+ }
+
+ skspcl->msg_buf = NULL;
+ skspcl->mb_dma_address = 0;
+
+ skd_free_sg_list(skdev, skspcl->req.sksg_list,
+ SKD_N_SG_PER_SPECIAL,
+ skspcl->req.sksg_dma_address);
+
+ skspcl->req.sksg_list = NULL;
+ skspcl->req.sksg_dma_address = 0;
+
+ kfree(skspcl->req.sg);
+ }
+
+ kfree(skdev->skspcl_table);
+ skdev->skspcl_table = NULL;
+}
+
+static void skd_free_sksb(struct skd_device *skdev)
+{
+ struct skd_special_context *skspcl;
+ u32 nbytes;
+
+ skspcl = &skdev->internal_skspcl;
+
+ if (skspcl->data_buf != NULL) {
+ nbytes = SKD_N_INTERNAL_BYTES;
+
+ pci_free_consistent(skdev->pdev, nbytes,
+ skspcl->data_buf, skspcl->db_dma_address);
+ }
+
+ skspcl->data_buf = NULL;
+ skspcl->db_dma_address = 0;
+
+ if (skspcl->msg_buf != NULL) {
+ nbytes = SKD_N_SPECIAL_FITMSG_BYTES;
+ pci_free_consistent(skdev->pdev, nbytes,
+ skspcl->msg_buf, skspcl->mb_dma_address);
+ }
+
+ skspcl->msg_buf = NULL;
+ skspcl->mb_dma_address = 0;
+
+ skd_free_sg_list(skdev, skspcl->req.sksg_list, 1,
+ skspcl->req.sksg_dma_address);
+
+ skspcl->req.sksg_list = NULL;
+ skspcl->req.sksg_dma_address = 0;
+}
+
+static void skd_free_sg_list(struct skd_device *skdev,
+ struct fit_sg_descriptor *sg_list,
+ u32 n_sg, dma_addr_t dma_addr)
+{
+ if (sg_list != NULL) {
+ u32 nbytes;
+
+ nbytes = sizeof(*sg_list) * n_sg;
+
+ pci_free_consistent(skdev->pdev, nbytes, sg_list, dma_addr);
+ }
+}
+
+static void skd_free_disk(struct skd_device *skdev)
+{
+ struct gendisk *disk = skdev->disk;
+
+ if (disk != NULL) {
+ struct request_queue *q = disk->queue;
+
+ if (disk->flags & GENHD_FL_UP)
+ del_gendisk(disk);
+ if (q)
+ blk_cleanup_queue(q);
+ put_disk(disk);
+ }
+ skdev->disk = NULL;
+}
+
+
+
+/*
+ *****************************************************************************
+ * BLOCK DEVICE (BDEV) GLUE
+ *****************************************************************************
+ */
+
+static int skd_bdev_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+ struct skd_device *skdev;
+ u64 capacity;
+
+ skdev = bdev->bd_disk->private_data;
+
+ DPRINTK(skdev, "%s: CMD[%s] getgeo device\n",
+ bdev->bd_disk->disk_name, current->comm);
+
+ if (skdev->read_cap_is_valid) {
+ capacity = get_capacity(skdev->disk);
+ geo->heads = 64;
+ geo->sectors = 255;
+ geo->cylinders = (capacity) / (255 * 64);
+
+ return 0;
+ }
+ return -EIO;
+}
+
+static int skd_bdev_attach(struct skd_device *skdev)
+{
+ DPRINTK(skdev, "add_disk\n");
+ add_disk(skdev->disk);
+ return 0;
+}
+
+static const struct block_device_operations skd_blockdev_ops = {
+ .owner = THIS_MODULE,
+ .ioctl = skd_bdev_ioctl,
+ .getgeo = skd_bdev_getgeo,
+};
+
+
+/*
+ *****************************************************************************
+ * PCIe DRIVER GLUE
+ *****************************************************************************
+ */
+
+static DEFINE_PCI_DEVICE_TABLE(skd_pci_tbl) = {
+ { PCI_VENDOR_ID_STEC, PCI_DEVICE_ID_S1120,
+ PCI_ANY_ID, PCI_ANY_ID, 0, 0, },
+ { 0 } /* terminate list */
+};
+
+MODULE_DEVICE_TABLE(pci, skd_pci_tbl);
+
+static char *skd_pci_info(struct skd_device *skdev, char *str)
+{
+ int pcie_reg;
+
+ strcpy(str, "PCIe (");
+ pcie_reg = pci_find_capability(skdev->pdev, PCI_CAP_ID_EXP);
+
+ if (pcie_reg) {
+
+ char lwstr[6];
+ uint16_t pcie_lstat, lspeed, lwidth;
+
+ pcie_reg += 0x12;
+ pci_read_config_word(skdev->pdev, pcie_reg, &pcie_lstat);
+ lspeed = pcie_lstat & (0xF);
+ lwidth = (pcie_lstat & 0x3F0) >> 4;
+
+ if (lspeed == 1)
+ strcat(str, "2.5GT/s ");
+ else if (lspeed == 2)
+ strcat(str, "5.0GT/s ");
+ else
+ strcat(str, "<unknown> ");
+ snprintf(lwstr, sizeof(lwstr), "%dX)", lwidth);
+ strcat(str, lwstr);
+ }
+ return str;
+}
+
+static int skd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+ int i;
+ int rc = 0;
+ char pci_str[32];
+ struct skd_device *skdev;
+
+ pr_info("STEC s1120 Driver(%s) version %s-b%s\n",
+ DRV_NAME, DRV_VERSION, DRV_BUILD_ID);
+ pr_info("(skd?:??:[%s]): vendor=%04X device=%04x\n",
+ pci_name(pdev), pdev->vendor, pdev->device);
+
+ rc = pci_enable_device(pdev);
+ if (rc)
+ return rc;
+ rc = pci_request_regions(pdev, DRV_NAME);
+ if (rc)
+ goto err_out;
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+ if (!rc) {
+ if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
+
+ pr_err("(%s): consistent DMA mask error %d\n",
+ pci_name(pdev), rc);
+ }
+ } else {
+ (rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)));
+ if (rc) {
+
+ pr_err("(%s): DMA mask error %d\n",
+ pci_name(pdev), rc);
+ goto err_out_regions;
+ }
+ }
+
+ skdev = skd_construct(pdev);
+ if (skdev == NULL)
+ goto err_out_regions;
+
+ skd_pci_info(skdev, pci_str);
+ pr_info("(%s): %s 64bit\n", skd_name(skdev), pci_str);
+
+ pci_set_master(pdev);
+ rc = pci_enable_pcie_error_reporting(pdev);
+ if (rc) {
+ pr_err(
+ "(%s): bad enable of PCIe error reporting rc=%d\n",
+ skd_name(skdev), rc);
+ skdev->pcie_error_reporting_is_enabled = 0;
+ } else
+ skdev->pcie_error_reporting_is_enabled = 1;
+
+
+ pci_set_drvdata(pdev, skdev);
+ skdev->pdev = pdev;
+ skdev->disk->driverfs_dev = &pdev->dev;
+
+ for (i = 0; i < SKD_MAX_BARS; i++) {
+ skdev->mem_phys[i] = pci_resource_start(pdev, i);
+ skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
+ skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
+ skdev->mem_size[i]);
+ if (!skdev->mem_map[i]) {
+ pr_err("(%s): Unable to map adapter memory!\n",
+ skd_name(skdev));
+ rc = -ENODEV;
+ goto err_out_iounmap;
+ }
+ DPRINTK(skdev, "mem_map=%p, phyd=%016llx, size=%d\n",
+ skdev->mem_map[i],
+ (uint64_t)skdev->mem_phys[i], skdev->mem_size[i]);
+ }
+
+ rc = skd_acquire_irq(skdev);
+ if (rc) {
+ pr_err("(%s): interrupt resource error %d\n",
+ skd_name(skdev), rc);
+ goto err_out_iounmap;
+ }
+
+ rc = skd_start_timer(skdev);
+ if (rc)
+ goto err_out_timer;
+
+ init_waitqueue_head(&skdev->waitq);
+
+ skd_start_device(skdev);
+
+ rc = wait_event_interruptible_timeout(skdev->waitq,
+ (skdev->gendisk_on),
+ (SKD_START_WAIT_SECONDS * HZ));
+ if (skdev->gendisk_on > 0) {
+ /* device came on-line after reset */
+ skd_bdev_attach(skdev);
+ rc = 0;
+ } else {
+ /* we timed out, something is wrong with the device,
+ don't add the disk structure */
+ pr_err(
+ "(%s): error: waiting for s1120 timed out %d!\n",
+ skd_name(skdev), rc);
+ /* in case of no error; we timeout with ENXIO */
+ if (!rc)
+ rc = -ENXIO;
+ goto err_out_timer;
+ }
+
+
+#ifdef SKD_VMK_POLL_HANDLER
+ if (skdev->irq_type == SKD_IRQ_MSIX) {
+ /* MSIX completion handler is being used for coredump */
+ vmklnx_scsi_register_poll_handler(skdev->scsi_host,
+ skdev->msix_entries[5].vector,
+ skd_comp_q, skdev);
+ } else {
+ vmklnx_scsi_register_poll_handler(skdev->scsi_host,
+ skdev->pdev->irq, skd_isr,
+ skdev);
+ }
+#endif /* SKD_VMK_POLL_HANDLER */
+
+ return rc;
+
+err_out_timer:
+ skd_stop_device(skdev);
+ skd_release_irq(skdev);
+
+err_out_iounmap:
+ for (i = 0; i < SKD_MAX_BARS; i++)
+ if (skdev->mem_map[i])
+ iounmap(skdev->mem_map[i]);
+
+ if (skdev->pcie_error_reporting_is_enabled)
+ pci_disable_pcie_error_reporting(pdev);
+
+ skd_destruct(skdev);
+
+err_out_regions:
+ pci_release_regions(pdev);
+
+err_out:
+ pci_disable_device(pdev);
+ pci_set_drvdata(pdev, NULL);
+ return rc;
+}
+
+static void skd_pci_remove(struct pci_dev *pdev)
+{
+ int i;
+ struct skd_device *skdev;
+
+ skdev = pci_get_drvdata(pdev);
+ if (!skdev) {
+ pr_err("%s: no device data for PCI\n", pci_name(pdev));
+ return;
+ }
+ skd_stop_device(skdev);
+ skd_release_irq(skdev);
+
+ for (i = 0; i < SKD_MAX_BARS; i++)
+ if (skdev->mem_map[i])
+ iounmap((u32 *)skdev->mem_map[i]);
+
+ if (skdev->pcie_error_reporting_is_enabled)
+ pci_disable_pcie_error_reporting(pdev);
+
+ skd_destruct(skdev);
+
+ pci_release_regions(pdev);
+ pci_disable_device(pdev);
+ pci_set_drvdata(pdev, NULL);
+
+ return;
+}
+
+static int skd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ int i;
+ struct skd_device *skdev;
+
+ skdev = pci_get_drvdata(pdev);
+ if (!skdev) {
+ pr_err("%s: no device data for PCI\n", pci_name(pdev));
+ return -EIO;
+ }
+
+ skd_stop_device(skdev);
+
+ skd_release_irq(skdev);
+
+ for (i = 0; i < SKD_MAX_BARS; i++)
+ if (skdev->mem_map[i])
+ iounmap((u32 *)skdev->mem_map[i]);
+
+ if (skdev->pcie_error_reporting_is_enabled)
+ pci_disable_pcie_error_reporting(pdev);
+
+ pci_release_regions(pdev);
+ pci_save_state(pdev);
+ pci_disable_device(pdev);
+ pci_set_power_state(pdev, pci_choose_state(pdev, state));
+ return 0;
+}
+
+static int skd_pci_resume(struct pci_dev *pdev)
+{
+ int i;
+ int rc = 0;
+ struct skd_device *skdev;
+
+ skdev = pci_get_drvdata(pdev);
+ if (!skdev) {
+ pr_err("%s: no device data for PCI\n", pci_name(pdev));
+ return -1;
+ }
+
+ pci_set_power_state(pdev, PCI_D0);
+ pci_enable_wake(pdev, PCI_D0, 0);
+ pci_restore_state(pdev);
+
+ rc = pci_enable_device(pdev);
+ if (rc)
+ return rc;
+ rc = pci_request_regions(pdev, DRV_NAME);
+ if (rc)
+ goto err_out;
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+ if (!rc) {
+ if (pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64))) {
+
+ pr_err("(%s): consistent DMA mask error %d\n",
+ pci_name(pdev), rc);
+ }
+ } else {
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+ if (rc) {
+
+ pr_err("(%s): DMA mask error %d\n",
+ pci_name(pdev), rc);
+ goto err_out_regions;
+ }
+ }
+
+ pci_set_master(pdev);
+ rc = pci_enable_pcie_error_reporting(pdev);
+ if (rc) {
+ pr_err("(%s): bad enable of PCIe error reporting rc=%d\n",
+ skdev->name, rc);
+ skdev->pcie_error_reporting_is_enabled = 0;
+ } else
+ skdev->pcie_error_reporting_is_enabled = 1;
+
+ for (i = 0; i < SKD_MAX_BARS; i++) {
+
+ skdev->mem_phys[i] = pci_resource_start(pdev, i);
+ skdev->mem_size[i] = (u32)pci_resource_len(pdev, i);
+ skdev->mem_map[i] = ioremap(skdev->mem_phys[i],
+ skdev->mem_size[i]);
+ if (!skdev->mem_map[i]) {
+ pr_err("(%s): Unable to map adapter memory!\n",
+ skd_name(skdev));
+ rc = -ENODEV;
+ goto err_out_iounmap;
+ }
+ DPRINTK(skdev, "mem_map=%p, phyd=%016llx, size=%d\n",
+ skdev->mem_map[i],
+ (uint64_t)skdev->mem_phys[i], skdev->mem_size[i]);
+ }
+ rc = skd_acquire_irq(skdev);
+ if (rc) {
+
+ pr_err("(%s): interrupt resource error %d\n",
+ pci_name(pdev), rc);
+ goto err_out_iounmap;
+ }
+
+ rc = skd_start_timer(skdev);
+ if (rc)
+ goto err_out_timer;
+
+ init_waitqueue_head(&skdev->waitq);
+
+ skd_start_device(skdev);
+
+ return rc;
+
+err_out_timer:
+ skd_stop_device(skdev);
+ skd_release_irq(skdev);
+
+err_out_iounmap:
+ for (i = 0; i < SKD_MAX_BARS; i++)
+ if (skdev->mem_map[i])
+ iounmap(skdev->mem_map[i]);
+
+ if (skdev->pcie_error_reporting_is_enabled)
+ pci_disable_pcie_error_reporting(pdev);
+
+err_out_regions:
+ pci_release_regions(pdev);
+
+err_out:
+ pci_disable_device(pdev);
+ return rc;
+}
+
+static void skd_pci_shutdown(struct pci_dev *pdev)
+{
+ struct skd_device *skdev;
+
+ pr_err("skd_pci_shutdown called\n");
+
+ skdev = pci_get_drvdata(pdev);
+ if (!skdev) {
+ pr_err("%s: no device data for PCI\n", pci_name(pdev));
+ return;
+ }
+
+ pr_err("%s: calling stop\n", skd_name(skdev));
+ skd_stop_device(skdev);
+}
+
+static struct pci_driver skd_driver = {
+ .name = DRV_NAME,
+ .id_table = skd_pci_tbl,
+ .probe = skd_pci_probe,
+ .remove = skd_pci_remove,
+ .suspend = skd_pci_suspend,
+ .resume = skd_pci_resume,
+ .shutdown = skd_pci_shutdown,
+};
+
+/*
+ *****************************************************************************
+ * LOGGING SUPPORT
+ *****************************************************************************
+ */
+
+static const char *skd_name(struct skd_device *skdev)
+{
+ memset(skdev->id_str, 0, sizeof(skdev->id_str));
+
+ if (skdev->inquiry_is_valid)
+ snprintf(skdev->id_str, sizeof(skdev->id_str), "%s:%s:[%s]",
+ skdev->name, skdev->inq_serial_num,
+ pci_name(skdev->pdev));
+ else
+ snprintf(skdev->id_str, sizeof(skdev->id_str), "%s:??:[%s]",
+ skdev->name, pci_name(skdev->pdev));
+
+ return skdev->id_str;
+}
+
+const char *skd_drive_state_to_str(int state)
+{
+ switch (state) {
+ case FIT_SR_DRIVE_OFFLINE:
+ return "OFFLINE";
+ case FIT_SR_DRIVE_INIT:
+ return "INIT";
+ case FIT_SR_DRIVE_ONLINE:
+ return "ONLINE";
+ case FIT_SR_DRIVE_BUSY:
+ return "BUSY";
+ case FIT_SR_DRIVE_FAULT:
+ return "FAULT";
+ case FIT_SR_DRIVE_DEGRADED:
+ return "DEGRADED";
+ case FIT_SR_PCIE_LINK_DOWN:
+ return "INK_DOWN";
+ case FIT_SR_DRIVE_SOFT_RESET:
+ return "SOFT_RESET";
+ case FIT_SR_DRIVE_NEED_FW_DOWNLOAD:
+ return "NEED_FW";
+ case FIT_SR_DRIVE_INIT_FAULT:
+ return "INIT_FAULT";
+ case FIT_SR_DRIVE_BUSY_SANITIZE:
+ return "BUSY_SANITIZE";
+ case FIT_SR_DRIVE_BUSY_ERASE:
+ return "BUSY_ERASE";
+ case FIT_SR_DRIVE_FW_BOOTING:
+ return "FW_BOOTING";
+ default:
+ return "???";
+ }
+}
+
+const char *skd_skdev_state_to_str(enum skd_drvr_state state)
+{
+ switch (state) {
+ case SKD_DRVR_STATE_LOAD:
+ return "LOAD";
+ case SKD_DRVR_STATE_IDLE:
+ return "IDLE";
+ case SKD_DRVR_STATE_BUSY:
+ return "BUSY";
+ case SKD_DRVR_STATE_STARTING:
+ return "STARTING";
+ case SKD_DRVR_STATE_ONLINE:
+ return "ONLINE";
+ case SKD_DRVR_STATE_PAUSING:
+ return "PAUSING";
+ case SKD_DRVR_STATE_PAUSED:
+ return "PAUSED";
+ case SKD_DRVR_STATE_DRAINING_TIMEOUT:
+ return "DRAINING_TIMEOUT";
+ case SKD_DRVR_STATE_RESTARTING:
+ return "RESTARTING";
+ case SKD_DRVR_STATE_RESUMING:
+ return "RESUMING";
+ case SKD_DRVR_STATE_STOPPING:
+ return "STOPPING";
+ case SKD_DRVR_STATE_SYNCING:
+ return "SYNCING";
+ case SKD_DRVR_STATE_FAULT:
+ return "FAULT";
+ case SKD_DRVR_STATE_DISAPPEARED:
+ return "DISAPPEARED";
+ case SKD_DRVR_STATE_BUSY_ERASE:
+ return "BUSY_ERASE";
+ case SKD_DRVR_STATE_BUSY_SANITIZE:
+ return "BUSY_SANITIZE";
+ case SKD_DRVR_STATE_BUSY_IMMINENT:
+ return "BUSY_IMMINENT";
+ case SKD_DRVR_STATE_WAIT_BOOT:
+ return "WAIT_BOOT";
+
+ default:
+ return "???";
+ }
+}
+
+const char *skd_skmsg_state_to_str(enum skd_fit_msg_state state)
+{
+ switch (state) {
+ case SKD_MSG_STATE_IDLE:
+ return "IDLE";
+ case SKD_MSG_STATE_BUSY:
+ return "BUSY";
+ default:
+ return "???";
+ }
+}
+
+const char *skd_skreq_state_to_str(enum skd_req_state state)
+{
+ switch (state) {
+ case SKD_REQ_STATE_IDLE:
+ return "IDLE";
+ case SKD_REQ_STATE_SETUP:
+ return "SETUP";
+ case SKD_REQ_STATE_BUSY:
+ return "BUSY";
+ case SKD_REQ_STATE_COMPLETED:
+ return "COMPLETED";
+ case SKD_REQ_STATE_TIMEOUT:
+ return "TIMEOUT";
+ case SKD_REQ_STATE_ABORTED:
+ return "ABORTED";
+ default:
+ return "???";
+ }
+}
+
+static void skd_log_skdev(struct skd_device *skdev, const char *event)
+{
+ DPRINTK(skdev, "(%s) skdev=%p event='%s'\n", skdev->name, skdev, event);
+ DPRINTK(skdev, " drive_state=%s(%d) driver_state=%s(%d)\n",
+ skd_drive_state_to_str(skdev->drive_state), skdev->drive_state,
+ skd_skdev_state_to_str(skdev->state), skdev->state);
+ DPRINTK(skdev, " busy=%d limit=%d dev=%d lowat=%d\n",
+ skdev->in_flight, skdev->cur_max_queue_depth,
+ skdev->dev_max_queue_depth, skdev->queue_low_water_mark);
+ DPRINTK(skdev, " timestamp=0x%x cycle=%d cycle_ix=%d\n",
+ skdev->timeout_stamp, skdev->skcomp_cycle, skdev->skcomp_ix);
+}
+
+static void skd_log_skmsg(struct skd_device *skdev,
+ struct skd_fitmsg_context *skmsg, const char *event)
+{
+ DPRINTK(skdev, "(%s) skmsg=%p event='%s'\n", skdev->name, skmsg, event);
+ DPRINTK(skdev, " state=%s(%d) id=0x%04x length=%d\n",
+ skd_skmsg_state_to_str(skmsg->state), skmsg->state,
+ skmsg->id, skmsg->length);
+}
+
+static void skd_log_skreq(struct skd_device *skdev,
+ struct skd_request_context *skreq, const char *event)
+{
+ DPRINTK(skdev, "(%s) skreq=%p event='%s'\n", skdev->name, skreq, event);
+ DPRINTK(skdev, " state=%s(%d) id=0x%04x fitmsg=0x%04x\n",
+ skd_skreq_state_to_str(skreq->state), skreq->state,
+ skreq->id, skreq->fitmsg_id);
+ DPRINTK(skdev, " timo=0x%x sg_dir=%d n_sg=%d\n",
+ skreq->timeout_stamp, skreq->sg_data_dir, skreq->n_sg);
+
+ if (!skd_bio) {
+ if (skreq->req != NULL) {
+ struct request *req = skreq->req;
+ u32 lba = (u32)blk_rq_pos(req);
+ u32 count = blk_rq_sectors(req);
+
+ DPRINTK(skdev,
+ " req=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
+ req, lba, lba, count, count,
+ (int)rq_data_dir(req));
+ } else
+ DPRINTK(skdev, " req=NULL\n");
+ } else {
+ if (skreq->bio != NULL) {
+ struct bio *bio = skreq->bio;
+ u32 lba = (u32)bio->bi_sector;
+ u32 count = bio_sectors(bio);
+
+ DPRINTK(skdev,
+ " bio=%p lba=%u(0x%x) count=%u(0x%x) dir=%d\n",
+ bio, lba, lba, count, count,
+ (int)bio_data_dir(bio));
+ } else
+ DPRINTK(skdev, " req=NULL\n");
+ }
+}
+
+/*
+ *****************************************************************************
+ * MODULE GLUE
+ *****************************************************************************
+ */
+
+static int __init skd_init(void)
+{
+ int rc = 0;
+
+ pr_info(PFX " v%s-b%s loaded\n", DRV_VERSION, DRV_BUILD_ID);
+
+ switch (skd_isr_type) {
+ case SKD_IRQ_LEGACY:
+ case SKD_IRQ_MSI:
+ case SKD_IRQ_MSIX:
+ break;
+ default:
+ pr_info("skd_isr_type %d invalid, re-set to %d\n",
+ skd_isr_type, SKD_IRQ_DEFAULT);
+ skd_isr_type = SKD_IRQ_DEFAULT;
+ }
+
+ skd_flush_slab = kmem_cache_create(SKD_FLUSH_JOB,
+ sizeof(struct skd_flush_cmd),
+ 0, 0, NULL);
+
+ if (!skd_flush_slab) {
+ pr_err("failed to allocated flush slab.\n");
+ return -ENOMEM;
+ }
+
+ if (skd_max_queue_depth < 1
+ || skd_max_queue_depth > SKD_MAX_QUEUE_DEPTH) {
+ pr_info(
+ "skd_max_queue_depth %d invalid, re-set to %d\n",
+ skd_max_queue_depth, SKD_MAX_QUEUE_DEPTH_DEFAULT);
+ skd_max_queue_depth = SKD_MAX_QUEUE_DEPTH_DEFAULT;
+ }
+
+ if (skd_max_req_per_msg < 1 || skd_max_req_per_msg > 14) {
+ pr_info(
+ "skd_max_req_per_msg %d invalid, re-set to %d\n",
+ skd_max_req_per_msg, SKD_MAX_REQ_PER_MSG_DEFAULT);
+ skd_max_req_per_msg = SKD_MAX_REQ_PER_MSG_DEFAULT;
+ }
+
+ if (skd_sgs_per_request < 1 || skd_sgs_per_request > 4096) {
+ pr_info(
+ "skd_sg_per_request %d invalid, re-set to %d\n",
+ skd_sgs_per_request, SKD_N_SG_PER_REQ_DEFAULT);
+ skd_sgs_per_request = SKD_N_SG_PER_REQ_DEFAULT;
+ }
+
+ if (skd_dbg_level < 0 || skd_dbg_level > 2) {
+ pr_info("skd_dbg_level %d invalid, re-set to %d\n",
+ skd_dbg_level, 0);
+ skd_dbg_level = 0;
+ }
+
+ if (skd_isr_comp_limit < 0) {
+ pr_info("skd_isr_comp_limit %d invalid, set to %d\n",
+ skd_isr_comp_limit, 0);
+ skd_isr_comp_limit = 0;
+ }
+
+ if (skd_max_pass_thru < 1 || skd_max_pass_thru > 50) {
+ pr_info("skd_max_pass_thru %d invalid, re-set to %d\n",
+ skd_max_pass_thru, SKD_N_SPECIAL_CONTEXT);
+ skd_max_pass_thru = SKD_N_SPECIAL_CONTEXT;
+ }
+
+ /* Obtain major device number. */
+ rc = register_blkdev(0, DRV_NAME);
+ if (rc < 0)
+ return rc;
+
+ skd_major = rc;
+
+ return pci_register_driver(&skd_driver);
+
+}
+
+static void __exit skd_exit(void)
+{
+ pr_info(PFX " v%s-b%s unloading\n", DRV_VERSION, DRV_BUILD_ID);
+
+ unregister_blkdev(skd_major, DRV_NAME);
+ pci_unregister_driver(&skd_driver);
+
+ kmem_cache_destroy(skd_flush_slab);
+}
+
+static int
+skd_flush_cmd_enqueue(struct skd_device *skdev, void *cmd)
+{
+ struct skd_flush_cmd *item;
+
+ item = kmem_cache_zalloc(skd_flush_slab, GFP_ATOMIC);
+ if (!item) {
+ pr_err("skd_flush_cmd_enqueue: Failed to allocated item.\n");
+ return -ENOMEM;
+ }
+
+ item->cmd = cmd;
+ list_add_tail(&item->flist, &skdev->flush_list);
+ return 0;
+}
+
+static void *
+skd_flush_cmd_dequeue(struct skd_device *skdev)
+{
+ void *cmd;
+ struct skd_flush_cmd *item;
+
+ item = list_entry(skdev->flush_list.next, struct skd_flush_cmd, flist);
+ list_del_init(&item->flist);
+ cmd = item->cmd;
+ kmem_cache_free(skd_flush_slab, item);
+ return cmd;
+}
+
+module_init(skd_init);
+module_exit(skd_exit);
projects / karo-tx-linux.git / commitdiff