--- /dev/null
+/**
+ * IBM Accelerator Family 'GenWQE'
+ *
+ * (C) Copyright IBM Corp. 2013
+ *
+ * Author: Frank Haverkamp <haver@linux.vnet.ibm.com>
+ * Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
+ * Author: Michael Jung <mijung@de.ibm.com>
+ * Author: Michael Ruettger <michael@ibmra.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * Device Driver Control Block (DDCB) queue support. Definition of
+ * interrupt handlers for queue support as well as triggering the
+ * health monitor code in case of problems. The current hardware uses
+ * an MSI interrupt which is shared between error handling and
+ * functional code.
+ */
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/crc-itu-t.h>
+
+#include "card_ddcb.h"
+
+/*
+ * N: next DDCB, this is where the next DDCB will be put.
+ * A: active DDCB, this is where the code will look for the next completion.
+ * x: DDCB is enqueued, we are waiting for its completion.
+
+ * Situation (1): Empty queue
+ * +---+---+---+---+---+---+---+---+
+ * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
+ * | | | | | | | | |
+ * +---+---+---+---+---+---+---+---+
+ * A/N
+ * enqueued_ddcbs = A - N = 2 - 2 = 0
+ *
+ * Situation (2): Wrapped, N > A
+ * +---+---+---+---+---+---+---+---+
+ * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
+ * | | | x | x | | | | |
+ * +---+---+---+---+---+---+---+---+
+ * A N
+ * enqueued_ddcbs = N - A = 4 - 2 = 2
+ *
+ * Situation (3): Queue wrapped, A > N
+ * +---+---+---+---+---+---+---+---+
+ * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
+ * | x | x | | | x | x | x | x |
+ * +---+---+---+---+---+---+---+---+
+ * N A
+ * enqueued_ddcbs = queue_max - (A - N) = 8 - (4 - 2) = 6
+ *
+ * Situation (4a): Queue full N > A
+ * +---+---+---+---+---+---+---+---+
+ * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
+ * | x | x | x | x | x | x | x | |
+ * +---+---+---+---+---+---+---+---+
+ * A N
+ *
+ * enqueued_ddcbs = N - A = 7 - 0 = 7
+ *
+ * Situation (4a): Queue full A > N
+ * +---+---+---+---+---+---+---+---+
+ * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
+ * | x | x | x | | x | x | x | x |
+ * +---+---+---+---+---+---+---+---+
+ * N A
+ * enqueued_ddcbs = queue_max - (A - N) = 8 - (4 - 3) = 7
+ */
+
+static int queue_empty(struct ddcb_queue *queue)
+{
+ return queue->ddcb_next == queue->ddcb_act;
+}
+
+static int queue_enqueued_ddcbs(struct ddcb_queue *queue)
+{
+ if (queue->ddcb_next >= queue->ddcb_act)
+ return queue->ddcb_next - queue->ddcb_act;
+
+ return queue->ddcb_max - (queue->ddcb_act - queue->ddcb_next);
+}
+
+static int queue_free_ddcbs(struct ddcb_queue *queue)
+{
+ int free_ddcbs = queue->ddcb_max - queue_enqueued_ddcbs(queue) - 1;
+
+ if (WARN_ON_ONCE(free_ddcbs < 0)) { /* must never ever happen! */
+ return 0;
+ }
+ return free_ddcbs;
+}
+
+/*
+ * Use of the PRIV field in the DDCB for queue debugging:
+ *
+ * (1) Trying to get rid of a DDCB which saw a timeout:
+ * pddcb->priv[6] = 0xcc; # cleared
+ *
+ * (2) Append a DDCB via NEXT bit:
+ * pddcb->priv[7] = 0xaa; # appended
+ *
+ * (3) DDCB needed tapping:
+ * pddcb->priv[7] = 0xbb; # tapped
+ *
+ * (4) DDCB marked as correctly finished:
+ * pddcb->priv[6] = 0xff; # finished
+ */
+
+static inline void ddcb_mark_tapped(struct ddcb *pddcb)
+{
+ pddcb->priv[7] = 0xbb; /* tapped */
+}
+
+static inline void ddcb_mark_appended(struct ddcb *pddcb)
+{
+ pddcb->priv[7] = 0xaa; /* appended */
+}
+
+static inline void ddcb_mark_cleared(struct ddcb *pddcb)
+{
+ pddcb->priv[6] = 0xcc; /* cleared */
+}
+
+static inline void ddcb_mark_finished(struct ddcb *pddcb)
+{
+ pddcb->priv[6] = 0xff; /* finished */
+}
+
+static inline void ddcb_mark_unused(struct ddcb *pddcb)
+{
+ pddcb->priv_64 = cpu_to_be64(0); /* not tapped */
+}
+
+/**
+ * genwqe_crc16() - Generate 16-bit crc as required for DDCBs
+ * @buff: pointer to data buffer
+ * @len: length of data for calculation
+ * @init: initial crc (0xffff at start)
+ *
+ * Polynomial = x^16 + x^12 + x^5 + 1 (0x1021)
+ * Example: 4 bytes 0x01 0x02 0x03 0x04 with init = 0xffff
+ * should result in a crc16 of 0x89c3
+ *
+ * Return: crc16 checksum in big endian format !
+ */
+static inline u16 genwqe_crc16(const u8 *buff, size_t len, u16 init)
+{
+ return crc_itu_t(init, buff, len);
+}
+
+static void print_ddcb_info(struct genwqe_dev *cd, struct ddcb_queue *queue)
+{
+ int i;
+ struct ddcb *pddcb;
+ unsigned long flags;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ spin_lock_irqsave(&cd->print_lock, flags);
+
+ dev_info(&pci_dev->dev,
+ "DDCB list for card #%d (ddcb_act=%d / ddcb_next=%d):\n",
+ cd->card_idx, queue->ddcb_act, queue->ddcb_next);
+
+ pddcb = queue->ddcb_vaddr;
+ for (i = 0; i < queue->ddcb_max; i++) {
+ dev_err(&pci_dev->dev,
+ " %c %-3d: RETC=%03x SEQ=%04x "
+ "HSI=%02X SHI=%02x PRIV=%06llx CMD=%03x\n",
+ i == queue->ddcb_act ? '>' : ' ',
+ i,
+ be16_to_cpu(pddcb->retc_16),
+ be16_to_cpu(pddcb->seqnum_16),
+ pddcb->hsi,
+ pddcb->shi,
+ be64_to_cpu(pddcb->priv_64),
+ pddcb->cmd);
+ pddcb++;
+ }
+ spin_unlock_irqrestore(&cd->print_lock, flags);
+}
+
+struct genwqe_ddcb_cmd *ddcb_requ_alloc(void)
+{
+ struct ddcb_requ *req;
+
+ req = kzalloc(sizeof(*req), GFP_ATOMIC);
+ if (!req)
+ return NULL;
+
+ return &req->cmd;
+}
+
+void ddcb_requ_free(struct genwqe_ddcb_cmd *cmd)
+{
+ struct ddcb_requ *req = container_of(cmd, struct ddcb_requ, cmd);
+ kfree(req);
+}
+
+static inline enum genwqe_requ_state ddcb_requ_get_state(struct ddcb_requ *req)
+{
+ return req->req_state;
+}
+
+static inline void ddcb_requ_set_state(struct ddcb_requ *req,
+ enum genwqe_requ_state new_state)
+{
+ req->req_state = new_state;
+}
+
+static inline int ddcb_requ_collect_debug_data(struct ddcb_requ *req)
+{
+ return req->cmd.ddata_addr != 0x0;
+}
+
+/**
+ * ddcb_requ_finished() - Returns the hardware state of the associated DDCB
+ * @cd: pointer to genwqe device descriptor
+ * @req: DDCB work request
+ *
+ * Status of ddcb_requ mirrors this hardware state, but is copied in
+ * the ddcb_requ on interrupt/polling function. The lowlevel code
+ * should check the hardware state directly, the higher level code
+ * should check the copy.
+ *
+ * This function will also return true if the state of the queue is
+ * not GENWQE_CARD_USED. This enables us to purge all DDCBs in the
+ * shutdown case.
+ */
+static int ddcb_requ_finished(struct genwqe_dev *cd, struct ddcb_requ *req)
+{
+ return (ddcb_requ_get_state(req) == GENWQE_REQU_FINISHED) ||
+ (cd->card_state != GENWQE_CARD_USED);
+}
+
+/**
+ * enqueue_ddcb() - Enqueue a DDCB
+ * @cd: pointer to genwqe device descriptor
+ * @queue: queue this operation should be done on
+ * @ddcb_no: pointer to ddcb number being tapped
+ *
+ * Start execution of DDCB by tapping or append to queue via NEXT
+ * bit. This is done by an atomic 'compare and swap' instruction and
+ * checking SHI and HSI of the previous DDCB.
+ *
+ * This function must only be called with ddcb_lock held.
+ *
+ * Return: 1 if new DDCB is appended to previous
+ * 2 if DDCB queue is tapped via register/simulation
+ */
+#define RET_DDCB_APPENDED 1
+#define RET_DDCB_TAPPED 2
+
+static int enqueue_ddcb(struct genwqe_dev *cd, struct ddcb_queue *queue,
+ struct ddcb *pddcb, int ddcb_no)
+{
+ unsigned int try;
+ int prev_no;
+ struct ddcb *prev_ddcb;
+ u32 old, new, icrc_hsi_shi;
+ u64 num;
+
+ /*
+ * For performance checks a Dispatch Timestamp can be put into
+ * DDCB It is supposed to use the SLU's free running counter,
+ * but this requires PCIe cycles.
+ */
+ ddcb_mark_unused(pddcb);
+
+ /* check previous DDCB if already fetched */
+ prev_no = (ddcb_no == 0) ? queue->ddcb_max - 1 : ddcb_no - 1;
+ prev_ddcb = &queue->ddcb_vaddr[prev_no];
+
+ /*
+ * It might have happened that the HSI.FETCHED bit is
+ * set. Retry in this case. Therefore I expect maximum 2 times
+ * trying.
+ */
+ ddcb_mark_appended(pddcb);
+ for (try = 0; try < 2; try++) {
+ old = prev_ddcb->icrc_hsi_shi_32; /* read SHI/HSI in BE32 */
+
+ /* try to append via NEXT bit if prev DDCB is not completed */
+ if ((old & DDCB_COMPLETED_BE32) != 0x00000000)
+ break;
+
+ new = (old | DDCB_NEXT_BE32);
+ icrc_hsi_shi = cmpxchg(&prev_ddcb->icrc_hsi_shi_32, old, new);
+
+ if (icrc_hsi_shi == old)
+ return RET_DDCB_APPENDED; /* appended to queue */
+ }
+
+ /* Queue must be re-started by updating QUEUE_OFFSET */
+ ddcb_mark_tapped(pddcb);
+ num = (u64)ddcb_no << 8;
+ __genwqe_writeq(cd, queue->IO_QUEUE_OFFSET, num); /* start queue */
+
+ return RET_DDCB_TAPPED;
+}
+
+/**
+ * copy_ddcb_results() - Copy output state from real DDCB to request
+ *
+ * Copy DDCB ASV to request struct. There is no endian
+ * conversion made, since data structure in ASV is still
+ * unknown here.
+ *
+ * This is needed by:
+ * - genwqe_purge_ddcb()
+ * - genwqe_check_ddcb_queue()
+ */
+static void copy_ddcb_results(struct ddcb_requ *req, int ddcb_no)
+{
+ struct ddcb_queue *queue = req->queue;
+ struct ddcb *pddcb = &queue->ddcb_vaddr[req->num];
+
+ memcpy(&req->cmd.asv[0], &pddcb->asv[0], DDCB_ASV_LENGTH);
+
+ /* copy status flags of the variant part */
+ req->cmd.vcrc = be16_to_cpu(pddcb->vcrc_16);
+ req->cmd.deque_ts = be64_to_cpu(pddcb->deque_ts_64);
+ req->cmd.cmplt_ts = be64_to_cpu(pddcb->cmplt_ts_64);
+
+ req->cmd.attn = be16_to_cpu(pddcb->attn_16);
+ req->cmd.progress = be32_to_cpu(pddcb->progress_32);
+ req->cmd.retc = be16_to_cpu(pddcb->retc_16);
+
+ if (ddcb_requ_collect_debug_data(req)) {
+ int prev_no = (ddcb_no == 0) ?
+ queue->ddcb_max - 1 : ddcb_no - 1;
+ struct ddcb *prev_pddcb = &queue->ddcb_vaddr[prev_no];
+
+ memcpy(&req->debug_data.ddcb_finished, pddcb,
+ sizeof(req->debug_data.ddcb_finished));
+ memcpy(&req->debug_data.ddcb_prev, prev_pddcb,
+ sizeof(req->debug_data.ddcb_prev));
+ }
+}
+
+/**
+ * genwqe_check_ddcb_queue() - Checks DDCB queue for completed work equests.
+ * @cd: pointer to genwqe device descriptor
+ *
+ * Return: Number of DDCBs which were finished
+ */
+static int genwqe_check_ddcb_queue(struct genwqe_dev *cd,
+ struct ddcb_queue *queue)
+{
+ unsigned long flags;
+ int ddcbs_finished = 0;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ spin_lock_irqsave(&queue->ddcb_lock, flags);
+
+ /* FIXME avoid soft locking CPU */
+ while (!queue_empty(queue) && (ddcbs_finished < queue->ddcb_max)) {
+
+ struct ddcb *pddcb;
+ struct ddcb_requ *req;
+ u16 vcrc, vcrc_16, retc_16;
+
+ pddcb = &queue->ddcb_vaddr[queue->ddcb_act];
+
+ if ((pddcb->icrc_hsi_shi_32 & DDCB_COMPLETED_BE32) ==
+ 0x00000000)
+ goto go_home; /* not completed, continue waiting */
+
+ /* Note: DDCB could be purged */
+
+ req = queue->ddcb_req[queue->ddcb_act];
+ if (req == NULL) {
+ /* this occurs if DDCB is purged, not an error */
+ /* Move active DDCB further; Nothing to do anymore. */
+ goto pick_next_one;
+ }
+
+ /*
+ * HSI=0x44 (fetched and completed), but RETC is
+ * 0x101, or even worse 0x000.
+ *
+ * In case of seeing the queue in inconsistent state
+ * we read the errcnts and the queue status to provide
+ * a trigger for our PCIe analyzer stop capturing.
+ */
+ retc_16 = be16_to_cpu(pddcb->retc_16);
+ if ((pddcb->hsi == 0x44) && (retc_16 <= 0x101)) {
+ u64 errcnts, status;
+ u64 ddcb_offs = (u64)pddcb - (u64)queue->ddcb_vaddr;
+
+ errcnts = __genwqe_readq(cd, queue->IO_QUEUE_ERRCNTS);
+ status = __genwqe_readq(cd, queue->IO_QUEUE_STATUS);
+
+ dev_err(&pci_dev->dev,
+ "[%s] SEQN=%04x HSI=%02x RETC=%03x "
+ " Q_ERRCNTS=%016llx Q_STATUS=%016llx\n"
+ " DDCB_DMA_ADDR=%016llx\n",
+ __func__, be16_to_cpu(pddcb->seqnum_16),
+ pddcb->hsi, retc_16, errcnts, status,
+ queue->ddcb_daddr + ddcb_offs);
+ }
+
+ copy_ddcb_results(req, queue->ddcb_act);
+ queue->ddcb_req[queue->ddcb_act] = NULL; /* take from queue */
+
+ dev_dbg(&pci_dev->dev, "FINISHED DDCB#%d\n", req->num);
+ genwqe_hexdump(pci_dev, pddcb, sizeof(*pddcb));
+
+ ddcb_mark_finished(pddcb);
+
+ /* calculate CRC_16 to see if VCRC is correct */
+ vcrc = genwqe_crc16(pddcb->asv,
+ VCRC_LENGTH(req->cmd.asv_length),
+ 0xffff);
+ vcrc_16 = be16_to_cpu(pddcb->vcrc_16);
+ if (vcrc != vcrc_16) {
+ printk_ratelimited(KERN_ERR
+ "%s %s: err: wrong VCRC pre=%02x vcrc_len=%d "
+ "bytes vcrc_data=%04x is not vcrc_card=%04x\n",
+ GENWQE_DEVNAME, dev_name(&pci_dev->dev),
+ pddcb->pre, VCRC_LENGTH(req->cmd.asv_length),
+ vcrc, vcrc_16);
+ }
+
+ ddcb_requ_set_state(req, GENWQE_REQU_FINISHED);
+ queue->ddcbs_completed++;
+ queue->ddcbs_in_flight--;
+
+ /* wake up process waiting for this DDCB */
+ wake_up_interruptible(&queue->ddcb_waitqs[queue->ddcb_act]);
+
+pick_next_one:
+ queue->ddcb_act = (queue->ddcb_act + 1) % queue->ddcb_max;
+ ddcbs_finished++;
+ }
+
+ go_home:
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+ return ddcbs_finished;
+}
+
+/**
+ * __genwqe_wait_ddcb(): Waits until DDCB is completed
+ * @cd: pointer to genwqe device descriptor
+ * @req: pointer to requsted DDCB parameters
+ *
+ * The Service Layer will update the RETC in DDCB when processing is
+ * pending or done.
+ *
+ * Return: > 0 remaining jiffies, DDCB completed
+ * -ETIMEDOUT when timeout
+ * -ERESTARTSYS when ^C
+ * -EINVAL when unknown error condition
+ *
+ * When an error is returned the called needs to ensure that
+ * purge_ddcb() is being called to get the &req removed from the
+ * queue.
+ */
+int __genwqe_wait_ddcb(struct genwqe_dev *cd, struct ddcb_requ *req)
+{
+ int rc;
+ unsigned int ddcb_no;
+ struct ddcb_queue *queue;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ if (req == NULL)
+ return -EINVAL;
+
+ queue = req->queue;
+ if (queue == NULL)
+ return -EINVAL;
+
+ ddcb_no = req->num;
+ if (ddcb_no >= queue->ddcb_max)
+ return -EINVAL;
+
+ rc = wait_event_interruptible_timeout(queue->ddcb_waitqs[ddcb_no],
+ ddcb_requ_finished(cd, req),
+ genwqe_ddcb_software_timeout * HZ);
+
+ /*
+ * We need to distinguish 3 cases here:
+ * 1. rc == 0 timeout occured
+ * 2. rc == -ERESTARTSYS signal received
+ * 3. rc > 0 remaining jiffies condition is true
+ */
+ if (rc == 0) {
+ struct ddcb_queue *queue = req->queue;
+ struct ddcb *pddcb;
+
+ /*
+ * Timeout may be caused by long task switching time.
+ * When timeout happens, check if the request has
+ * meanwhile completed.
+ */
+ genwqe_check_ddcb_queue(cd, req->queue);
+ if (ddcb_requ_finished(cd, req))
+ return rc;
+
+ dev_err(&pci_dev->dev,
+ "[%s] err: DDCB#%d timeout rc=%d state=%d req @ %p\n",
+ __func__, req->num, rc, ddcb_requ_get_state(req),
+ req);
+ dev_err(&pci_dev->dev,
+ "[%s] IO_QUEUE_STATUS=0x%016llx\n", __func__,
+ __genwqe_readq(cd, queue->IO_QUEUE_STATUS));
+
+ pddcb = &queue->ddcb_vaddr[req->num];
+ genwqe_hexdump(pci_dev, pddcb, sizeof(*pddcb));
+
+ print_ddcb_info(cd, req->queue);
+ return -ETIMEDOUT;
+
+ } else if (rc == -ERESTARTSYS) {
+ return rc;
+ /*
+ * EINTR: Stops the application
+ * ERESTARTSYS: Restartable systemcall; called again
+ */
+
+ } else if (rc < 0) {
+ dev_err(&pci_dev->dev,
+ "[%s] err: DDCB#%d unknown result (rc=%d) %d!\n",
+ __func__, req->num, rc, ddcb_requ_get_state(req));
+ return -EINVAL;
+ }
+
+ /* Severe error occured. Driver is forced to stop operation */
+ if (cd->card_state != GENWQE_CARD_USED) {
+ dev_err(&pci_dev->dev,
+ "[%s] err: DDCB#%d forced to stop (rc=%d)\n",
+ __func__, req->num, rc);
+ return -EIO;
+ }
+ return rc;
+}
+
+/**
+ * get_next_ddcb() - Get next available DDCB
+ * @cd: pointer to genwqe device descriptor
+ *
+ * DDCB's content is completely cleared but presets for PRE and
+ * SEQNUM. This function must only be called when ddcb_lock is held.
+ *
+ * Return: NULL if no empty DDCB available otherwise ptr to next DDCB.
+ */
+static struct ddcb *get_next_ddcb(struct genwqe_dev *cd,
+ struct ddcb_queue *queue,
+ int *num)
+{
+ u64 *pu64;
+ struct ddcb *pddcb;
+
+ if (queue_free_ddcbs(queue) == 0) /* queue is full */
+ return NULL;
+
+ /* find new ddcb */
+ pddcb = &queue->ddcb_vaddr[queue->ddcb_next];
+
+ /* if it is not completed, we are not allowed to use it */
+ /* barrier(); */
+ if ((pddcb->icrc_hsi_shi_32 & DDCB_COMPLETED_BE32) == 0x00000000)
+ return NULL;
+
+ *num = queue->ddcb_next; /* internal DDCB number */
+ queue->ddcb_next = (queue->ddcb_next + 1) % queue->ddcb_max;
+
+ /* clear important DDCB fields */
+ pu64 = (u64 *)pddcb;
+ pu64[0] = 0ULL; /* offs 0x00 (ICRC,HSI,SHI,...) */
+ pu64[1] = 0ULL; /* offs 0x01 (ACFUNC,CMD...) */
+
+ /* destroy previous results in ASV */
+ pu64[0x80/8] = 0ULL; /* offs 0x80 (ASV + 0) */
+ pu64[0x88/8] = 0ULL; /* offs 0x88 (ASV + 0x08) */
+ pu64[0x90/8] = 0ULL; /* offs 0x90 (ASV + 0x10) */
+ pu64[0x98/8] = 0ULL; /* offs 0x98 (ASV + 0x18) */
+ pu64[0xd0/8] = 0ULL; /* offs 0xd0 (RETC,ATTN...) */
+
+ pddcb->pre = DDCB_PRESET_PRE; /* 128 */
+ pddcb->seqnum_16 = cpu_to_be16(queue->ddcb_seq++);
+ return pddcb;
+}
+
+/**
+ * __genwqe_purge_ddcb() - Remove a DDCB from the workqueue
+ * @cd: genwqe device descriptor
+ * @req: DDCB request
+ *
+ * This will fail when the request was already FETCHED. In this case
+ * we need to wait until it is finished. Else the DDCB can be
+ * reused. This function also ensures that the request data structure
+ * is removed from ddcb_req[].
+ *
+ * Do not forget to call this function when genwqe_wait_ddcb() fails,
+ * such that the request gets really removed from ddcb_req[].
+ *
+ * Return: 0 success
+ */
+int __genwqe_purge_ddcb(struct genwqe_dev *cd, struct ddcb_requ *req)
+{
+ struct ddcb *pddcb = NULL;
+ unsigned int t;
+ unsigned long flags;
+ struct ddcb_queue *queue = req->queue;
+ struct pci_dev *pci_dev = cd->pci_dev;
+ u32 icrc_hsi_shi = 0x0000;
+ u64 queue_status;
+ u32 old, new;
+
+ /* unsigned long flags; */
+ if (genwqe_ddcb_software_timeout <= 0) {
+ dev_err(&pci_dev->dev,
+ "[%s] err: software timeout is not set!\n", __func__);
+ return -EFAULT;
+ }
+
+ pddcb = &queue->ddcb_vaddr[req->num];
+
+ for (t = 0; t < genwqe_ddcb_software_timeout * 10; t++) {
+
+ spin_lock_irqsave(&queue->ddcb_lock, flags);
+
+ /* Check if req was meanwhile finished */
+ if (ddcb_requ_get_state(req) == GENWQE_REQU_FINISHED)
+ goto go_home;
+
+ /* try to set PURGE bit if FETCHED/COMPLETED are not set */
+ old = pddcb->icrc_hsi_shi_32; /* read SHI/HSI in BE32 */
+ if ((old & DDCB_FETCHED_BE32) == 0x00000000) {
+
+ new = (old | DDCB_PURGE_BE32);
+ icrc_hsi_shi = cmpxchg(&pddcb->icrc_hsi_shi_32,
+ old, new);
+ if (icrc_hsi_shi == old)
+ goto finish_ddcb;
+ }
+
+ /* normal finish with HSI bit */
+ barrier();
+ icrc_hsi_shi = pddcb->icrc_hsi_shi_32;
+ if (icrc_hsi_shi & DDCB_COMPLETED_BE32)
+ goto finish_ddcb;
+
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+
+ /*
+ * Here the check_ddcb() function will most likely
+ * discover this DDCB to be finished some point in
+ * time. It will mark the req finished and free it up
+ * in the list.
+ */
+
+ copy_ddcb_results(req, req->num); /* for the failing case */
+ msleep(100); /* sleep for 1/10 second and try again */
+ continue;
+
+finish_ddcb:
+ copy_ddcb_results(req, req->num);
+ ddcb_requ_set_state(req, GENWQE_REQU_FINISHED);
+ queue->ddcbs_in_flight--;
+ queue->ddcb_req[req->num] = NULL; /* delete from array */
+ ddcb_mark_cleared(pddcb);
+
+ /* Move active DDCB further; Nothing to do here anymore. */
+
+ /*
+ * We need to ensure that there is at least one free
+ * DDCB in the queue. To do that, we must update
+ * ddcb_act only if the COMPLETED bit is set for the
+ * DDCB we are working on else we treat that DDCB even
+ * if we PURGED it as occupied (hardware is supposed
+ * to set the COMPLETED bit yet!).
+ */
+ icrc_hsi_shi = pddcb->icrc_hsi_shi_32;
+ if ((icrc_hsi_shi & DDCB_COMPLETED_BE32) &&
+ (queue->ddcb_act == req->num)) {
+ queue->ddcb_act = ((queue->ddcb_act + 1) %
+ queue->ddcb_max);
+ }
+go_home:
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+ return 0;
+ }
+
+ /*
+ * If the card is dead and the queue is forced to stop, we
+ * might see this in the queue status register.
+ */
+ queue_status = __genwqe_readq(cd, queue->IO_QUEUE_STATUS);
+
+ dev_dbg(&pci_dev->dev, "UN/FINISHED DDCB#%d\n", req->num);
+ genwqe_hexdump(pci_dev, pddcb, sizeof(*pddcb));
+
+ dev_err(&pci_dev->dev,
+ "[%s] err: DDCB#%d not purged and not completed "
+ "after %d seconds QSTAT=%016llx!!\n",
+ __func__, req->num, genwqe_ddcb_software_timeout,
+ queue_status);
+
+ print_ddcb_info(cd, req->queue);
+
+ return -EFAULT;
+}
+
+int genwqe_init_debug_data(struct genwqe_dev *cd, struct genwqe_debug_data *d)
+{
+ int len;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ if (d == NULL) {
+ dev_err(&pci_dev->dev,
+ "[%s] err: invalid memory for debug data!\n",
+ __func__);
+ return -EFAULT;
+ }
+
+ len = sizeof(d->driver_version);
+ snprintf(d->driver_version, len, "%s", DRV_VERS_STRING);
+ d->slu_unitcfg = cd->slu_unitcfg;
+ d->app_unitcfg = cd->app_unitcfg;
+ return 0;
+}
+
+/**
+ * __genwqe_enqueue_ddcb() - Enqueue a DDCB
+ * @cd: pointer to genwqe device descriptor
+ * @req: pointer to DDCB execution request
+ *
+ * Return: 0 if enqueuing succeeded
+ * -EIO if card is unusable/PCIe problems
+ * -EBUSY if enqueuing failed
+ */
+int __genwqe_enqueue_ddcb(struct genwqe_dev *cd, struct ddcb_requ *req)
+{
+ struct ddcb *pddcb;
+ unsigned long flags;
+ struct ddcb_queue *queue;
+ struct pci_dev *pci_dev = cd->pci_dev;
+ u16 icrc;
+
+ if (cd->card_state != GENWQE_CARD_USED) {
+ printk_ratelimited(KERN_ERR
+ "%s %s: [%s] Card is unusable/PCIe problem Req#%d\n",
+ GENWQE_DEVNAME, dev_name(&pci_dev->dev),
+ __func__, req->num);
+ return -EIO;
+ }
+
+ queue = req->queue = &cd->queue;
+
+ /* FIXME circumvention to improve performance when no irq is
+ * there.
+ */
+ if (genwqe_polling_enabled)
+ genwqe_check_ddcb_queue(cd, queue);
+
+ /*
+ * It must be ensured to process all DDCBs in successive
+ * order. Use a lock here in order to prevent nested DDCB
+ * enqueuing.
+ */
+ spin_lock_irqsave(&queue->ddcb_lock, flags);
+
+ pddcb = get_next_ddcb(cd, queue, &req->num); /* get ptr and num */
+ if (pddcb == NULL) {
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+ queue->busy++;
+ return -EBUSY;
+ }
+
+ if (queue->ddcb_req[req->num] != NULL) {
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+
+ dev_err(&pci_dev->dev,
+ "[%s] picked DDCB %d with req=%p still in use!!\n",
+ __func__, req->num, req);
+ return -EFAULT;
+ }
+ ddcb_requ_set_state(req, GENWQE_REQU_ENQUEUED);
+ queue->ddcb_req[req->num] = req;
+
+ pddcb->cmdopts_16 = cpu_to_be16(req->cmd.cmdopts);
+ pddcb->cmd = req->cmd.cmd;
+ pddcb->acfunc = req->cmd.acfunc; /* functional unit */
+
+ /*
+ * We know that we can get retc 0x104 with CRC error, do not
+ * stop the queue in those cases for this command. XDIR = 1
+ * does not work for old SLU versions.
+ *
+ * Last bitstream with the old XDIR behavior had SLU_ID
+ * 0x34199.
+ */
+ if ((cd->slu_unitcfg & 0xFFFF0ull) > 0x34199ull)
+ pddcb->xdir = 0x1;
+ else
+ pddcb->xdir = 0x0;
+
+
+ pddcb->psp = (((req->cmd.asiv_length / 8) << 4) |
+ ((req->cmd.asv_length / 8)));
+ pddcb->disp_ts_64 = cpu_to_be64(req->cmd.disp_ts);
+
+ /*
+ * If copying the whole DDCB_ASIV_LENGTH is impacting
+ * performance we need to change it to
+ * req->cmd.asiv_length. But simulation benefits from some
+ * non-architectured bits behind the architectured content.
+ *
+ * How much data is copied depends on the availability of the
+ * ATS field, which was introduced late. If the ATS field is
+ * supported ASIV is 8 bytes shorter than it used to be. Since
+ * the ATS field is copied too, the code should do exactly
+ * what it did before, but I wanted to make copying of the ATS
+ * field very explicit.
+ */
+ if (genwqe_get_slu_id(cd) <= 0x2) {
+ memcpy(&pddcb->__asiv[0], /* destination */
+ &req->cmd.__asiv[0], /* source */
+ DDCB_ASIV_LENGTH); /* req->cmd.asiv_length */
+ } else {
+ pddcb->n.ats_64 = req->cmd.ats;
+ memcpy(&pddcb->n.asiv[0], /* destination */
+ &req->cmd.asiv[0], /* source */
+ DDCB_ASIV_LENGTH_ATS); /* req->cmd.asiv_length */
+ }
+
+ pddcb->icrc_hsi_shi_32 = cpu_to_be32(0x00000000); /* for crc */
+
+ /*
+ * Calculate CRC_16 for corresponding range PSP(7:4). Include
+ * empty 4 bytes prior to the data.
+ */
+ icrc = genwqe_crc16((const u8 *)pddcb,
+ ICRC_LENGTH(req->cmd.asiv_length), 0xffff);
+ pddcb->icrc_hsi_shi_32 = cpu_to_be32((u32)icrc << 16);
+
+ /* enable DDCB completion irq */
+ if (!genwqe_polling_enabled)
+ pddcb->icrc_hsi_shi_32 |= DDCB_INTR_BE32;
+
+ dev_dbg(&pci_dev->dev, "INPUT DDCB#%d\n", req->num);
+ genwqe_hexdump(pci_dev, pddcb, sizeof(*pddcb));
+
+ if (ddcb_requ_collect_debug_data(req)) {
+ /* use the kernel copy of debug data. copying back to
+ user buffer happens later */
+
+ genwqe_init_debug_data(cd, &req->debug_data);
+ memcpy(&req->debug_data.ddcb_before, pddcb,
+ sizeof(req->debug_data.ddcb_before));
+ }
+
+ enqueue_ddcb(cd, queue, pddcb, req->num);
+ queue->ddcbs_in_flight++;
+
+ if (queue->ddcbs_in_flight > queue->ddcbs_max_in_flight)
+ queue->ddcbs_max_in_flight = queue->ddcbs_in_flight;
+
+ ddcb_requ_set_state(req, GENWQE_REQU_TAPPED);
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+ wake_up_interruptible(&cd->queue_waitq);
+
+ return 0;
+}
+
+/**
+ * __genwqe_execute_raw_ddcb() - Setup and execute DDCB
+ * @cd: pointer to genwqe device descriptor
+ * @req: user provided DDCB request
+ */
+int __genwqe_execute_raw_ddcb(struct genwqe_dev *cd,
+ struct genwqe_ddcb_cmd *cmd)
+{
+ int rc = 0;
+ struct pci_dev *pci_dev = cd->pci_dev;
+ struct ddcb_requ *req = container_of(cmd, struct ddcb_requ, cmd);
+
+ if (cmd->asiv_length > DDCB_ASIV_LENGTH) {
+ dev_err(&pci_dev->dev, "[%s] err: wrong asiv_length of %d\n",
+ __func__, cmd->asiv_length);
+ return -EINVAL;
+ }
+ if (cmd->asv_length > DDCB_ASV_LENGTH) {
+ dev_err(&pci_dev->dev, "[%s] err: wrong asv_length of %d\n",
+ __func__, cmd->asiv_length);
+ return -EINVAL;
+ }
+ rc = __genwqe_enqueue_ddcb(cd, req);
+ if (rc != 0)
+ return rc;
+
+ rc = __genwqe_wait_ddcb(cd, req);
+ if (rc < 0) /* error or signal interrupt */
+ goto err_exit;
+
+ if (ddcb_requ_collect_debug_data(req)) {
+ if (copy_to_user((void __user *)cmd->ddata_addr,
+ &req->debug_data,
+ sizeof(struct genwqe_debug_data)))
+ return -EFAULT;
+ }
+
+ /*
+ * Higher values than 0x102 indicate completion with faults,
+ * lower values than 0x102 indicate processing faults. Note
+ * that DDCB might have been purged. E.g. Cntl+C.
+ */
+ if (cmd->retc != DDCB_RETC_COMPLETE) {
+ /* This might happen e.g. flash read, and needs to be
+ handled by the upper layer code. */
+ rc = -EBADMSG; /* not processed/error retc */
+ }
+
+ return rc;
+
+ err_exit:
+ __genwqe_purge_ddcb(cd, req);
+
+ if (ddcb_requ_collect_debug_data(req)) {
+ if (copy_to_user((void __user *)cmd->ddata_addr,
+ &req->debug_data,
+ sizeof(struct genwqe_debug_data)))
+ return -EFAULT;
+ }
+ return rc;
+}
+
+/**
+ * genwqe_next_ddcb_ready() - Figure out if the next DDCB is already finished
+ *
+ * We use this as condition for our wait-queue code.
+ */
+static int genwqe_next_ddcb_ready(struct genwqe_dev *cd)
+{
+ unsigned long flags;
+ struct ddcb *pddcb;
+ struct ddcb_queue *queue = &cd->queue;
+
+ spin_lock_irqsave(&queue->ddcb_lock, flags);
+
+ if (queue_empty(queue)) { /* emtpy queue */
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+ return 0;
+ }
+
+ pddcb = &queue->ddcb_vaddr[queue->ddcb_act];
+ if (pddcb->icrc_hsi_shi_32 & DDCB_COMPLETED_BE32) { /* ddcb ready */
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+ return 1;
+ }
+
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+ return 0;
+}
+
+/**
+ * genwqe_ddcbs_in_flight() - Check how many DDCBs are in flight
+ *
+ * Keep track on the number of DDCBs which ware currently in the
+ * queue. This is needed for statistics as well as conditon if we want
+ * to wait or better do polling in case of no interrupts available.
+ */
+int genwqe_ddcbs_in_flight(struct genwqe_dev *cd)
+{
+ unsigned long flags;
+ int ddcbs_in_flight = 0;
+ struct ddcb_queue *queue = &cd->queue;
+
+ spin_lock_irqsave(&queue->ddcb_lock, flags);
+ ddcbs_in_flight += queue->ddcbs_in_flight;
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+
+ return ddcbs_in_flight;
+}
+
+static int setup_ddcb_queue(struct genwqe_dev *cd, struct ddcb_queue *queue)
+{
+ int rc, i;
+ struct ddcb *pddcb;
+ u64 val64;
+ unsigned int queue_size;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ if (genwqe_ddcb_max < 2)
+ return -EINVAL;
+
+ queue_size = roundup(genwqe_ddcb_max * sizeof(struct ddcb), PAGE_SIZE);
+
+ queue->ddcbs_in_flight = 0; /* statistics */
+ queue->ddcbs_max_in_flight = 0;
+ queue->ddcbs_completed = 0;
+ queue->busy = 0;
+
+ queue->ddcb_seq = 0x100; /* start sequence number */
+ queue->ddcb_max = genwqe_ddcb_max; /* module parameter */
+ queue->ddcb_vaddr = __genwqe_alloc_consistent(cd, queue_size,
+ &queue->ddcb_daddr);
+ if (queue->ddcb_vaddr == NULL) {
+ dev_err(&pci_dev->dev,
+ "[%s] **err: could not allocate DDCB **\n", __func__);
+ return -ENOMEM;
+ }
+ memset(queue->ddcb_vaddr, 0, queue_size);
+
+ queue->ddcb_req = kzalloc(sizeof(struct ddcb_requ *) *
+ queue->ddcb_max, GFP_KERNEL);
+ if (!queue->ddcb_req) {
+ rc = -ENOMEM;
+ goto free_ddcbs;
+ }
+
+ queue->ddcb_waitqs = kzalloc(sizeof(wait_queue_head_t) *
+ queue->ddcb_max, GFP_KERNEL);
+ if (!queue->ddcb_waitqs) {
+ rc = -ENOMEM;
+ goto free_requs;
+ }
+
+ for (i = 0; i < queue->ddcb_max; i++) {
+ pddcb = &queue->ddcb_vaddr[i]; /* DDCBs */
+ pddcb->icrc_hsi_shi_32 = DDCB_COMPLETED_BE32;
+ pddcb->retc_16 = cpu_to_be16(0xfff);
+
+ queue->ddcb_req[i] = NULL; /* requests */
+ init_waitqueue_head(&queue->ddcb_waitqs[i]); /* waitqueues */
+ }
+
+ queue->ddcb_act = 0;
+ queue->ddcb_next = 0; /* queue is empty */
+
+ spin_lock_init(&queue->ddcb_lock);
+ init_waitqueue_head(&queue->ddcb_waitq);
+
+ val64 = ((u64)(queue->ddcb_max - 1) << 8); /* lastptr */
+ __genwqe_writeq(cd, queue->IO_QUEUE_CONFIG, 0x07); /* iCRC/vCRC */
+ __genwqe_writeq(cd, queue->IO_QUEUE_SEGMENT, queue->ddcb_daddr);
+ __genwqe_writeq(cd, queue->IO_QUEUE_INITSQN, queue->ddcb_seq);
+ __genwqe_writeq(cd, queue->IO_QUEUE_WRAP, val64);
+ return 0;
+
+ free_requs:
+ kfree(queue->ddcb_req);
+ queue->ddcb_req = NULL;
+ free_ddcbs:
+ __genwqe_free_consistent(cd, queue_size, queue->ddcb_vaddr,
+ queue->ddcb_daddr);
+ queue->ddcb_vaddr = NULL;
+ queue->ddcb_daddr = 0ull;
+ return -ENODEV;
+
+}
+
+static int ddcb_queue_initialized(struct ddcb_queue *queue)
+{
+ return queue->ddcb_vaddr != NULL;
+}
+
+static void free_ddcb_queue(struct genwqe_dev *cd, struct ddcb_queue *queue)
+{
+ unsigned int queue_size;
+
+ queue_size = roundup(queue->ddcb_max * sizeof(struct ddcb), PAGE_SIZE);
+
+ kfree(queue->ddcb_req);
+ queue->ddcb_req = NULL;
+
+ if (queue->ddcb_vaddr) {
+ __genwqe_free_consistent(cd, queue_size, queue->ddcb_vaddr,
+ queue->ddcb_daddr);
+ queue->ddcb_vaddr = NULL;
+ queue->ddcb_daddr = 0ull;
+ }
+}
+
+static irqreturn_t genwqe_pf_isr(int irq, void *dev_id)
+{
+ u64 gfir;
+ struct genwqe_dev *cd = (struct genwqe_dev *)dev_id;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ /*
+ * In case of fatal FIR error the queue is stopped, such that
+ * we can safely check it without risking anything.
+ */
+ cd->irqs_processed++;
+ wake_up_interruptible(&cd->queue_waitq);
+
+ /*
+ * Checking for errors before kicking the queue might be
+ * safer, but slower for the good-case ... See above.
+ */
+ gfir = __genwqe_readq(cd, IO_SLC_CFGREG_GFIR);
+ if ((gfir & GFIR_ERR_TRIGGER) != 0x0) {
+
+ wake_up_interruptible(&cd->health_waitq);
+
+ /*
+ * By default GFIRs causes recovery actions. This
+ * count is just for debug when recovery is masked.
+ */
+ printk_ratelimited(KERN_ERR
+ "%s %s: [%s] GFIR=%016llx\n",
+ GENWQE_DEVNAME, dev_name(&pci_dev->dev),
+ __func__, gfir);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t genwqe_vf_isr(int irq, void *dev_id)
+{
+ struct genwqe_dev *cd = (struct genwqe_dev *)dev_id;
+
+ cd->irqs_processed++;
+ wake_up_interruptible(&cd->queue_waitq);
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * genwqe_card_thread() - Work thread for the DDCB queue
+ *
+ * The idea is to check if there are DDCBs in processing. If there are
+ * some finished DDCBs, we process them and wakeup the
+ * requestors. Otherwise we give other processes time using
+ * cond_resched().
+ */
+static int genwqe_card_thread(void *data)
+{
+ int should_stop = 0, rc = 0;
+ struct genwqe_dev *cd = (struct genwqe_dev *)data;
+
+ while (!kthread_should_stop()) {
+
+ genwqe_check_ddcb_queue(cd, &cd->queue);
+
+ if (genwqe_polling_enabled) {
+ rc = wait_event_interruptible_timeout(
+ cd->queue_waitq,
+ genwqe_ddcbs_in_flight(cd) ||
+ (should_stop = kthread_should_stop()), 1);
+ } else {
+ rc = wait_event_interruptible_timeout(
+ cd->queue_waitq,
+ genwqe_next_ddcb_ready(cd) ||
+ (should_stop = kthread_should_stop()), HZ);
+ }
+ if (should_stop)
+ break;
+
+ /*
+ * Avoid soft lockups on heavy loads; we do not want
+ * to disable our interrupts.
+ */
+ cond_resched();
+ }
+ return 0;
+}
+
+/**
+ * genwqe_setup_service_layer() - Setup DDCB queue
+ * @cd: pointer to genwqe device descriptor
+ *
+ * Allocate DDCBs. Configure Service Layer Controller (SLC).
+ *
+ * Return: 0 success
+ */
+int genwqe_setup_service_layer(struct genwqe_dev *cd)
+{
+ int rc;
+ struct ddcb_queue *queue;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ if (genwqe_is_privileged(cd)) {
+ rc = genwqe_card_reset(cd);
+ if (rc < 0) {
+ dev_err(&pci_dev->dev,
+ "[%s] err: reset failed.\n", __func__);
+ return rc;
+ }
+ genwqe_read_softreset(cd);
+ }
+
+ queue = &cd->queue;
+ queue->IO_QUEUE_CONFIG = IO_SLC_QUEUE_CONFIG;
+ queue->IO_QUEUE_STATUS = IO_SLC_QUEUE_STATUS;
+ queue->IO_QUEUE_SEGMENT = IO_SLC_QUEUE_SEGMENT;
+ queue->IO_QUEUE_INITSQN = IO_SLC_QUEUE_INITSQN;
+ queue->IO_QUEUE_OFFSET = IO_SLC_QUEUE_OFFSET;
+ queue->IO_QUEUE_WRAP = IO_SLC_QUEUE_WRAP;
+ queue->IO_QUEUE_WTIME = IO_SLC_QUEUE_WTIME;
+ queue->IO_QUEUE_ERRCNTS = IO_SLC_QUEUE_ERRCNTS;
+ queue->IO_QUEUE_LRW = IO_SLC_QUEUE_LRW;
+
+ rc = setup_ddcb_queue(cd, queue);
+ if (rc != 0) {
+ rc = -ENODEV;
+ goto err_out;
+ }
+
+ init_waitqueue_head(&cd->queue_waitq);
+ cd->card_thread = kthread_run(genwqe_card_thread, cd,
+ GENWQE_DEVNAME "%d_thread",
+ cd->card_idx);
+ if (IS_ERR(cd->card_thread)) {
+ rc = PTR_ERR(cd->card_thread);
+ cd->card_thread = NULL;
+ goto stop_free_queue;
+ }
+
+ rc = genwqe_set_interrupt_capability(cd, GENWQE_MSI_IRQS);
+ if (rc > 0)
+ rc = genwqe_set_interrupt_capability(cd, rc);
+ if (rc != 0) {
+ rc = -ENODEV;
+ goto stop_kthread;
+ }
+
+ /*
+ * We must have all wait-queues initialized when we enable the
+ * interrupts. Otherwise we might crash if we get an early
+ * irq.
+ */
+ init_waitqueue_head(&cd->health_waitq);
+
+ if (genwqe_is_privileged(cd)) {
+ rc = request_irq(pci_dev->irq, genwqe_pf_isr, IRQF_SHARED,
+ GENWQE_DEVNAME, cd);
+ } else {
+ rc = request_irq(pci_dev->irq, genwqe_vf_isr, IRQF_SHARED,
+ GENWQE_DEVNAME, cd);
+ }
+ if (rc < 0) {
+ dev_err(&pci_dev->dev, "irq %d not free.\n", pci_dev->irq);
+ goto stop_irq_cap;
+ }
+
+ cd->card_state = GENWQE_CARD_USED;
+ return 0;
+
+ stop_irq_cap:
+ genwqe_reset_interrupt_capability(cd);
+ stop_kthread:
+ kthread_stop(cd->card_thread);
+ cd->card_thread = NULL;
+ stop_free_queue:
+ free_ddcb_queue(cd, queue);
+ err_out:
+ return rc;
+}
+
+/**
+ * queue_wake_up_all() - Handles fatal error case
+ *
+ * The PCI device got unusable and we have to stop all pending
+ * requests as fast as we can. The code after this must purge the
+ * DDCBs in question and ensure that all mappings are freed.
+ */
+static int queue_wake_up_all(struct genwqe_dev *cd)
+{
+ unsigned int i;
+ unsigned long flags;
+ struct ddcb_queue *queue = &cd->queue;
+
+ spin_lock_irqsave(&queue->ddcb_lock, flags);
+
+ for (i = 0; i < queue->ddcb_max; i++)
+ wake_up_interruptible(&queue->ddcb_waitqs[queue->ddcb_act]);
+
+ spin_unlock_irqrestore(&queue->ddcb_lock, flags);
+
+ return 0;
+}
+
+/**
+ * genwqe_finish_queue() - Remove any genwqe devices and user-interfaces
+ *
+ * Relies on the pre-condition that there are no users of the card
+ * device anymore e.g. with open file-descriptors.
+ *
+ * This function must be robust enough to be called twice.
+ */
+int genwqe_finish_queue(struct genwqe_dev *cd)
+{
+ int i, rc, in_flight;
+ int waitmax = genwqe_ddcb_software_timeout;
+ struct pci_dev *pci_dev = cd->pci_dev;
+ struct ddcb_queue *queue = &cd->queue;
+
+ if (!ddcb_queue_initialized(queue))
+ return 0;
+
+ /* Do not wipe out the error state. */
+ if (cd->card_state == GENWQE_CARD_USED)
+ cd->card_state = GENWQE_CARD_UNUSED;
+
+ /* Wake up all requests in the DDCB queue such that they
+ should be removed nicely. */
+ queue_wake_up_all(cd);
+
+ /* We must wait to get rid of the DDCBs in flight */
+ for (i = 0; i < waitmax; i++) {
+ in_flight = genwqe_ddcbs_in_flight(cd);
+
+ if (in_flight == 0)
+ break;
+
+ dev_dbg(&pci_dev->dev,
+ " DEBUG [%d/%d] waiting for queue to get empty: "
+ "%d requests!\n", i, waitmax, in_flight);
+
+ /*
+ * Severe severe error situation: The card itself has
+ * 16 DDCB queues, each queue has e.g. 32 entries,
+ * each DDBC has a hardware timeout of currently 250
+ * msec but the PFs have a hardware timeout of 8 sec
+ * ... so I take something large.
+ */
+ msleep(1000);
+ }
+ if (i == waitmax) {
+ dev_err(&pci_dev->dev, " [%s] err: queue is not empty!!\n",
+ __func__);
+ rc = -EIO;
+ }
+ return rc;
+}
+
+/**
+ * genwqe_release_service_layer() - Shutdown DDCB queue
+ * @cd: genwqe device descriptor
+ *
+ * This function must be robust enough to be called twice.
+ */
+int genwqe_release_service_layer(struct genwqe_dev *cd)
+{
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ if (!ddcb_queue_initialized(&cd->queue))
+ return 1;
+
+ free_irq(pci_dev->irq, cd);
+ genwqe_reset_interrupt_capability(cd);
+
+ if (cd->card_thread != NULL) {
+ kthread_stop(cd->card_thread);
+ cd->card_thread = NULL;
+ }
+
+ free_ddcb_queue(cd, &cd->queue);
+ return 0;
+}
--- /dev/null
+#ifndef __CARD_DDCB_H__
+#define __CARD_DDCB_H__
+
+/**
+ * IBM Accelerator Family 'GenWQE'
+ *
+ * (C) Copyright IBM Corp. 2013
+ *
+ * Author: Frank Haverkamp <haver@linux.vnet.ibm.com>
+ * Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
+ * Author: Michael Jung <mijung@de.ibm.com>
+ * Author: Michael Ruettger <michael@ibmra.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+
+#include "genwqe_driver.h"
+#include "card_base.h"
+
+/**
+ * struct ddcb - Device Driver Control Block DDCB
+ * @hsi: Hardware software interlock
+ * @shi: Software hardware interlock. Hsi and shi are used to interlock
+ * software and hardware activities. We are using a compare and
+ * swap operation to ensure that there are no races when
+ * activating new DDCBs on the queue, or when we need to
+ * purge a DDCB from a running queue.
+ * @acfunc: Accelerator function addresses a unit within the chip
+ * @cmd: Command to work on
+ * @cmdopts_16: Options for the command
+ * @asiv: Input data
+ * @asv: Output data
+ *
+ * The DDCB data format is big endian. Multiple consequtive DDBCs form
+ * a DDCB queue.
+ */
+#define ASIV_LENGTH 104 /* Old specification without ATS field */
+#define ASIV_LENGTH_ATS 96 /* New specification with ATS field */
+#define ASV_LENGTH 64
+
+struct ddcb {
+ union {
+ __be32 icrc_hsi_shi_32; /* iCRC, Hardware/SW interlock */
+ struct {
+ __be16 icrc_16;
+ u8 hsi;
+ u8 shi;
+ };
+ };
+ u8 pre; /* Preamble */
+ u8 xdir; /* Execution Directives */
+ __be16 seqnum_16; /* Sequence Number */
+
+ u8 acfunc; /* Accelerator Function.. */
+ u8 cmd; /* Command. */
+ __be16 cmdopts_16; /* Command Options */
+ u8 sur; /* Status Update Rate */
+ u8 psp; /* Protection Section Pointer */
+ __be16 rsvd_0e_16; /* Reserved invariant */
+
+ __be64 fwiv_64; /* Firmware Invariant. */
+
+ union {
+ struct {
+ __be64 ats_64; /* Address Translation Spec */
+ u8 asiv[ASIV_LENGTH_ATS]; /* New ASIV */
+ } n;
+ u8 __asiv[ASIV_LENGTH]; /* obsolete */
+ };
+ u8 asv[ASV_LENGTH]; /* Appl Spec Variant */
+
+ __be16 rsvd_c0_16; /* Reserved Variant */
+ __be16 vcrc_16; /* Variant CRC */
+ __be32 rsvd_32; /* Reserved unprotected */
+
+ __be64 deque_ts_64; /* Deque Time Stamp. */
+
+ __be16 retc_16; /* Return Code */
+ __be16 attn_16; /* Attention/Extended Error Codes */
+ __be32 progress_32; /* Progress indicator. */
+
+ __be64 cmplt_ts_64; /* Completion Time Stamp. */
+
+ /* The following layout matches the new service layer format */
+ __be32 ibdc_32; /* Inbound Data Count (* 256) */
+ __be32 obdc_32; /* Outbound Data Count (* 256) */
+
+ __be64 rsvd_SLH_64; /* Reserved for hardware */
+ union { /* private data for driver */
+ u8 priv[8];
+ __be64 priv_64;
+ };
+ __be64 disp_ts_64; /* Dispatch TimeStamp */
+} __attribute__((__packed__));
+
+/* CRC polynomials for DDCB */
+#define CRC16_POLYNOMIAL 0x1021
+
+/*
+ * SHI: Software to Hardware Interlock
+ * This 1 byte field is written by software to interlock the
+ * movement of one queue entry to another with the hardware in the
+ * chip.
+ */
+#define DDCB_SHI_INTR 0x04 /* Bit 2 */
+#define DDCB_SHI_PURGE 0x02 /* Bit 1 */
+#define DDCB_SHI_NEXT 0x01 /* Bit 0 */
+
+/*
+ * HSI: Hardware to Software interlock
+ * This 1 byte field is written by hardware to interlock the movement
+ * of one queue entry to another with the software in the chip.
+ */
+#define DDCB_HSI_COMPLETED 0x40 /* Bit 6 */
+#define DDCB_HSI_FETCHED 0x04 /* Bit 2 */
+
+/*
+ * Accessing HSI/SHI is done 32-bit wide
+ * Normally 16-bit access would work too, but on some platforms the
+ * 16 compare and swap operation is not supported. Therefore
+ * switching to 32-bit such that those platforms will work too.
+ *
+ * iCRC HSI/SHI
+ */
+#define DDCB_INTR_BE32 cpu_to_be32(0x00000004)
+#define DDCB_PURGE_BE32 cpu_to_be32(0x00000002)
+#define DDCB_NEXT_BE32 cpu_to_be32(0x00000001)
+#define DDCB_COMPLETED_BE32 cpu_to_be32(0x00004000)
+#define DDCB_FETCHED_BE32 cpu_to_be32(0x00000400)
+
+/* Definitions of DDCB presets */
+#define DDCB_PRESET_PRE 0x80
+#define ICRC_LENGTH(n) ((n) + 8 + 8 + 8) /* used ASIV + hdr fields */
+#define VCRC_LENGTH(n) ((n)) /* used ASV */
+
+/*
+ * Genwqe Scatter Gather list
+ * Each element has up to 8 entries.
+ * The chaining element is element 0 cause of prefetching needs.
+ */
+
+/*
+ * 0b0110 Chained descriptor. The descriptor is describing the next
+ * descriptor list.
+ */
+#define SG_CHAINED (0x6)
+
+/*
+ * 0b0010 First entry of a descriptor list. Start from a Buffer-Empty
+ * condition.
+ */
+#define SG_DATA (0x2)
+
+/*
+ * 0b0000 Early terminator. This is the last entry on the list
+ * irregardless of the length indicated.
+ */
+#define SG_END_LIST (0x0)
+
+/**
+ * struct sglist - Scatter gather list
+ * @target_addr: Either a dma addr of memory to work on or a
+ * dma addr or a subsequent sglist block.
+ * @len: Length of the data block.
+ * @flags: See above.
+ *
+ * Depending on the command the GenWQE card can use a scatter gather
+ * list to describe the memory it works on. Always 8 sg_entry's form
+ * a block.
+ */
+struct sg_entry {
+ __be64 target_addr;
+ __be32 len;
+ __be32 flags;
+};
+
+#endif /* __CARD_DDCB_H__ */
--- /dev/null
+/**
+ * IBM Accelerator Family 'GenWQE'
+ *
+ * (C) Copyright IBM Corp. 2013
+ *
+ * Author: Frank Haverkamp <haver@linux.vnet.ibm.com>
+ * Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
+ * Author: Michael Jung <mijung@de.ibm.com>
+ * Author: Michael Ruettger <michael@ibmra.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (version 2 only)
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+/*
+ * Character device representation of the GenWQE device. This allows
+ * user-space applications to communicate with the card.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <linux/atomic.h>
+
+#include "card_base.h"
+#include "card_ddcb.h"
+
+static int genwqe_open_files(struct genwqe_dev *cd)
+{
+ int rc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cd->file_lock, flags);
+ rc = list_empty(&cd->file_list);
+ spin_unlock_irqrestore(&cd->file_lock, flags);
+ return !rc;
+}
+
+static void genwqe_add_file(struct genwqe_dev *cd, struct genwqe_file *cfile)
+{
+ unsigned long flags;
+
+ cfile->owner = current;
+ spin_lock_irqsave(&cd->file_lock, flags);
+ list_add(&cfile->list, &cd->file_list);
+ spin_unlock_irqrestore(&cd->file_lock, flags);
+}
+
+static int genwqe_del_file(struct genwqe_dev *cd, struct genwqe_file *cfile)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cd->file_lock, flags);
+ list_del(&cfile->list);
+ spin_unlock_irqrestore(&cd->file_lock, flags);
+
+ return 0;
+}
+
+static void genwqe_add_pin(struct genwqe_file *cfile, struct dma_mapping *m)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cfile->pin_lock, flags);
+ list_add(&m->pin_list, &cfile->pin_list);
+ spin_unlock_irqrestore(&cfile->pin_lock, flags);
+}
+
+static int genwqe_del_pin(struct genwqe_file *cfile, struct dma_mapping *m)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cfile->pin_lock, flags);
+ list_del(&m->pin_list);
+ spin_unlock_irqrestore(&cfile->pin_lock, flags);
+
+ return 0;
+}
+
+/**
+ * genwqe_search_pin() - Search for the mapping for a userspace address
+ * @cfile: Descriptor of opened file
+ * @u_addr: User virtual address
+ * @size: Size of buffer
+ * @dma_addr: DMA address to be updated
+ *
+ * Return: Pointer to the corresponding mapping NULL if not found
+ */
+static struct dma_mapping *genwqe_search_pin(struct genwqe_file *cfile,
+ unsigned long u_addr,
+ unsigned int size,
+ void **virt_addr)
+{
+ unsigned long flags;
+ struct dma_mapping *m;
+
+ spin_lock_irqsave(&cfile->pin_lock, flags);
+
+ list_for_each_entry(m, &cfile->pin_list, pin_list) {
+ if ((((u64)m->u_vaddr) <= (u_addr)) &&
+ (((u64)m->u_vaddr + m->size) >= (u_addr + size))) {
+
+ if (virt_addr)
+ *virt_addr = m->k_vaddr +
+ (u_addr - (u64)m->u_vaddr);
+
+ spin_unlock_irqrestore(&cfile->pin_lock, flags);
+ return m;
+ }
+ }
+ spin_unlock_irqrestore(&cfile->pin_lock, flags);
+ return NULL;
+}
+
+static void __genwqe_add_mapping(struct genwqe_file *cfile,
+ struct dma_mapping *dma_map)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cfile->map_lock, flags);
+ list_add(&dma_map->card_list, &cfile->map_list);
+ spin_unlock_irqrestore(&cfile->map_lock, flags);
+}
+
+static void __genwqe_del_mapping(struct genwqe_file *cfile,
+ struct dma_mapping *dma_map)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&cfile->map_lock, flags);
+ list_del(&dma_map->card_list);
+ spin_unlock_irqrestore(&cfile->map_lock, flags);
+}
+
+
+/**
+ * __genwqe_search_mapping() - Search for the mapping for a userspace address
+ * @cfile: descriptor of opened file
+ * @u_addr: user virtual address
+ * @size: size of buffer
+ * @dma_addr: DMA address to be updated
+ * Return: Pointer to the corresponding mapping NULL if not found
+ */
+static struct dma_mapping *__genwqe_search_mapping(struct genwqe_file *cfile,
+ unsigned long u_addr,
+ unsigned int size,
+ dma_addr_t *dma_addr,
+ void **virt_addr)
+{
+ unsigned long flags;
+ struct dma_mapping *m;
+ struct pci_dev *pci_dev = cfile->cd->pci_dev;
+
+ spin_lock_irqsave(&cfile->map_lock, flags);
+ list_for_each_entry(m, &cfile->map_list, card_list) {
+
+ if ((((u64)m->u_vaddr) <= (u_addr)) &&
+ (((u64)m->u_vaddr + m->size) >= (u_addr + size))) {
+
+ /* match found: current is as expected and
+ addr is in range */
+ if (dma_addr)
+ *dma_addr = m->dma_addr +
+ (u_addr - (u64)m->u_vaddr);
+
+ if (virt_addr)
+ *virt_addr = m->k_vaddr +
+ (u_addr - (u64)m->u_vaddr);
+
+ spin_unlock_irqrestore(&cfile->map_lock, flags);
+ return m;
+ }
+ }
+ spin_unlock_irqrestore(&cfile->map_lock, flags);
+
+ dev_err(&pci_dev->dev,
+ "[%s] Entry not found: u_addr=%lx, size=%x\n",
+ __func__, u_addr, size);
+
+ return NULL;
+}
+
+static void genwqe_remove_mappings(struct genwqe_file *cfile)
+{
+ int i = 0;
+ struct list_head *node, *next;
+ struct dma_mapping *dma_map;
+ struct genwqe_dev *cd = cfile->cd;
+ struct pci_dev *pci_dev = cfile->cd->pci_dev;
+
+ list_for_each_safe(node, next, &cfile->map_list) {
+ dma_map = list_entry(node, struct dma_mapping, card_list);
+
+ list_del_init(&dma_map->card_list);
+
+ /*
+ * This is really a bug, because those things should
+ * have been already tidied up.
+ *
+ * GENWQE_MAPPING_RAW should have been removed via mmunmap().
+ * GENWQE_MAPPING_SGL_TEMP should be removed by tidy up code.
+ */
+ dev_err(&pci_dev->dev,
+ "[%s] %d. cleanup mapping: u_vaddr=%p "
+ "u_kaddr=%016lx dma_addr=%llx\n", __func__, i++,
+ dma_map->u_vaddr, (unsigned long)dma_map->k_vaddr,
+ dma_map->dma_addr);
+
+ if (dma_map->type == GENWQE_MAPPING_RAW) {
+ /* we allocated this dynamically */
+ __genwqe_free_consistent(cd, dma_map->size,
+ dma_map->k_vaddr,
+ dma_map->dma_addr);
+ kfree(dma_map);
+ } else if (dma_map->type == GENWQE_MAPPING_SGL_TEMP) {
+ /* we use dma_map statically from the request */
+ genwqe_user_vunmap(cd, dma_map, NULL);
+ }
+ }
+}
+
+static void genwqe_remove_pinnings(struct genwqe_file *cfile)
+{
+ struct list_head *node, *next;
+ struct dma_mapping *dma_map;
+ struct genwqe_dev *cd = cfile->cd;
+
+ list_for_each_safe(node, next, &cfile->pin_list) {
+ dma_map = list_entry(node, struct dma_mapping, pin_list);
+
+ /*
+ * This is not a bug, because a killed processed might
+ * not call the unpin ioctl, which is supposed to free
+ * the resources.
+ *
+ * Pinnings are dymically allocated and need to be
+ * deleted.
+ */
+ list_del_init(&dma_map->pin_list);
+ genwqe_user_vunmap(cd, dma_map, NULL);
+ kfree(dma_map);
+ }
+}
+
+/**
+ * genwqe_kill_fasync() - Send signal to all processes with open GenWQE files
+ *
+ * E.g. genwqe_send_signal(cd, SIGIO);
+ */
+static int genwqe_kill_fasync(struct genwqe_dev *cd, int sig)
+{
+ unsigned int files = 0;
+ unsigned long flags;
+ struct genwqe_file *cfile;
+
+ spin_lock_irqsave(&cd->file_lock, flags);
+ list_for_each_entry(cfile, &cd->file_list, list) {
+ if (cfile->async_queue)
+ kill_fasync(&cfile->async_queue, sig, POLL_HUP);
+ files++;
+ }
+ spin_unlock_irqrestore(&cd->file_lock, flags);
+ return files;
+}
+
+static int genwqe_force_sig(struct genwqe_dev *cd, int sig)
+{
+ unsigned int files = 0;
+ unsigned long flags;
+ struct genwqe_file *cfile;
+
+ spin_lock_irqsave(&cd->file_lock, flags);
+ list_for_each_entry(cfile, &cd->file_list, list) {
+ force_sig(sig, cfile->owner);
+ files++;
+ }
+ spin_unlock_irqrestore(&cd->file_lock, flags);
+ return files;
+}
+
+/**
+ * genwqe_open() - file open
+ * @inode: file system information
+ * @filp: file handle
+ *
+ * This function is executed whenever an application calls
+ * open("/dev/genwqe",..).
+ *
+ * Return: 0 if successful or <0 if errors
+ */
+static int genwqe_open(struct inode *inode, struct file *filp)
+{
+ struct genwqe_dev *cd;
+ struct genwqe_file *cfile;
+ struct pci_dev *pci_dev;
+
+ cfile = kzalloc(sizeof(*cfile), GFP_KERNEL);
+ if (cfile == NULL)
+ return -ENOMEM;
+
+ cd = container_of(inode->i_cdev, struct genwqe_dev, cdev_genwqe);
+ pci_dev = cd->pci_dev;
+ cfile->cd = cd;
+ cfile->filp = filp;
+ cfile->client = NULL;
+
+ spin_lock_init(&cfile->map_lock); /* list of raw memory allocations */
+ INIT_LIST_HEAD(&cfile->map_list);
+
+ spin_lock_init(&cfile->pin_lock); /* list of user pinned memory */
+ INIT_LIST_HEAD(&cfile->pin_list);
+
+ filp->private_data = cfile;
+
+ genwqe_add_file(cd, cfile);
+ return 0;
+}
+
+/**
+ * genwqe_fasync() - Setup process to receive SIGIO.
+ * @fd: file descriptor
+ * @filp: file handle
+ * @mode: file mode
+ *
+ * Sending a signal is working as following:
+ *
+ * if (cdev->async_queue)
+ * kill_fasync(&cdev->async_queue, SIGIO, POLL_IN);
+ *
+ * Some devices also implement asynchronous notification to indicate
+ * when the device can be written; in this case, of course,
+ * kill_fasync must be called with a mode of POLL_OUT.
+ */
+static int genwqe_fasync(int fd, struct file *filp, int mode)
+{
+ struct genwqe_file *cdev = (struct genwqe_file *)filp->private_data;
+ return fasync_helper(fd, filp, mode, &cdev->async_queue);
+}
+
+
+/**
+ * genwqe_release() - file close
+ * @inode: file system information
+ * @filp: file handle
+ *
+ * This function is executed whenever an application calls 'close(fd_genwqe)'
+ *
+ * Return: always 0
+ */
+static int genwqe_release(struct inode *inode, struct file *filp)
+{
+ struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
+ struct genwqe_dev *cd = cfile->cd;
+
+ /* there must be no entries in these lists! */
+ genwqe_remove_mappings(cfile);
+ genwqe_remove_pinnings(cfile);
+
+ /* remove this filp from the asynchronously notified filp's */
+ genwqe_fasync(-1, filp, 0);
+
+ /*
+ * For this to work we must not release cd when this cfile is
+ * not yet released, otherwise the list entry is invalid,
+ * because the list itself gets reinstantiated!
+ */
+ genwqe_del_file(cd, cfile);
+ kfree(cfile);
+ return 0;
+}
+
+static void genwqe_vma_open(struct vm_area_struct *vma)
+{
+ /* nothing ... */
+}
+
+/**
+ * genwqe_vma_close() - Called each time when vma is unmapped
+ *
+ * Free memory which got allocated by GenWQE mmap().
+ */
+static void genwqe_vma_close(struct vm_area_struct *vma)
+{
+ unsigned long vsize = vma->vm_end - vma->vm_start;
+ struct inode *inode = vma->vm_file->f_dentry->d_inode;
+ struct dma_mapping *dma_map;
+ struct genwqe_dev *cd = container_of(inode->i_cdev, struct genwqe_dev,
+ cdev_genwqe);
+ struct pci_dev *pci_dev = cd->pci_dev;
+ dma_addr_t d_addr = 0;
+ struct genwqe_file *cfile = vma->vm_private_data;
+
+ dma_map = __genwqe_search_mapping(cfile, vma->vm_start, vsize,
+ &d_addr, NULL);
+ if (dma_map == NULL) {
+ dev_err(&pci_dev->dev,
+ " [%s] err: mapping not found: v=%lx, p=%lx s=%lx\n",
+ __func__, vma->vm_start, vma->vm_pgoff << PAGE_SHIFT,
+ vsize);
+ return;
+ }
+ __genwqe_del_mapping(cfile, dma_map);
+ __genwqe_free_consistent(cd, dma_map->size, dma_map->k_vaddr,
+ dma_map->dma_addr);
+ kfree(dma_map);
+}
+
+static struct vm_operations_struct genwqe_vma_ops = {
+ .open = genwqe_vma_open,
+ .close = genwqe_vma_close,
+};
+
+/**
+ * genwqe_mmap() - Provide contignous buffers to userspace
+ *
+ * We use mmap() to allocate contignous buffers used for DMA
+ * transfers. After the buffer is allocated we remap it to user-space
+ * and remember a reference to our dma_mapping data structure, where
+ * we store the associated DMA address and allocated size.
+ *
+ * When we receive a DDCB execution request with the ATS bits set to
+ * plain buffer, we lookup our dma_mapping list to find the
+ * corresponding DMA address for the associated user-space address.
+ */
+static int genwqe_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ int rc;
+ unsigned long pfn, vsize = vma->vm_end - vma->vm_start;
+ struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
+ struct genwqe_dev *cd = cfile->cd;
+ struct dma_mapping *dma_map;
+
+ if (vsize == 0)
+ return -EINVAL;
+
+ if (get_order(vsize) > MAX_ORDER)
+ return -ENOMEM;
+
+ dma_map = kzalloc(sizeof(struct dma_mapping), GFP_ATOMIC);
+ if (dma_map == NULL)
+ return -ENOMEM;
+
+ genwqe_mapping_init(dma_map, GENWQE_MAPPING_RAW);
+ dma_map->u_vaddr = (void *)vma->vm_start;
+ dma_map->size = vsize;
+ dma_map->nr_pages = DIV_ROUND_UP(vsize, PAGE_SIZE);
+ dma_map->k_vaddr = __genwqe_alloc_consistent(cd, vsize,
+ &dma_map->dma_addr);
+ if (dma_map->k_vaddr == NULL) {
+ rc = -ENOMEM;
+ goto free_dma_map;
+ }
+
+ if (capable(CAP_SYS_ADMIN) && (vsize > sizeof(dma_addr_t)))
+ *(dma_addr_t *)dma_map->k_vaddr = dma_map->dma_addr;
+
+ pfn = virt_to_phys(dma_map->k_vaddr) >> PAGE_SHIFT;
+ rc = remap_pfn_range(vma,
+ vma->vm_start,
+ pfn,
+ vsize,
+ vma->vm_page_prot);
+ if (rc != 0) {
+ rc = -EFAULT;
+ goto free_dma_mem;
+ }
+
+ vma->vm_private_data = cfile;
+ vma->vm_ops = &genwqe_vma_ops;
+ __genwqe_add_mapping(cfile, dma_map);
+
+ return 0;
+
+ free_dma_mem:
+ __genwqe_free_consistent(cd, dma_map->size,
+ dma_map->k_vaddr,
+ dma_map->dma_addr);
+ free_dma_map:
+ kfree(dma_map);
+ return rc;
+}
+
+/**
+ * do_flash_update() - Excute flash update (write image or CVPD)
+ * @cd: genwqe device
+ * @load: details about image load
+ *
+ * Return: 0 if successful
+ */
+
+#define FLASH_BLOCK 0x40000 /* we use 256k blocks */
+
+static int do_flash_update(struct genwqe_file *cfile,
+ struct genwqe_bitstream *load)
+{
+ int rc = 0;
+ int blocks_to_flash;
+ u64 dma_addr, flash = 0;
+ size_t tocopy = 0;
+ u8 __user *buf;
+ u8 *xbuf;
+ u32 crc;
+ u8 cmdopts;
+ struct genwqe_dev *cd = cfile->cd;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ if ((load->size & 0x3) != 0) {
+ dev_err(&pci_dev->dev,
+ "err: buf %d bytes not 4 bytes aligned!\n",
+ load->size);
+ return -EINVAL;
+ }
+ if (((unsigned long)(load->data_addr) & ~PAGE_MASK) != 0) {
+ dev_err(&pci_dev->dev,
+ "err: buf is not page aligned!\n");
+ return -EINVAL;
+ }
+
+ /* FIXME Bits have changed for new service layer! */
+ switch ((char)load->partition) {
+ case '0':
+ cmdopts = 0x14;
+ break; /* download/erase_first/part_0 */
+ case '1':
+ cmdopts = 0x1C;
+ break; /* download/erase_first/part_1 */
+ case 'v': /* cmdopts = 0x0c (VPD) */
+ default:
+ dev_err(&pci_dev->dev,
+ "err: invalid partition %02x!\n", load->partition);
+ return -EINVAL;
+ }
+ dev_info(&pci_dev->dev,
+ "[%s] start flash update UID: 0x%x size: %u bytes part: %c\n",
+ __func__, load->uid, load->size, (char)load->partition);
+
+ buf = (u8 __user *)load->data_addr;
+ xbuf = __genwqe_alloc_consistent(cd, FLASH_BLOCK, &dma_addr);
+ if (xbuf == NULL) {
+ dev_err(&pci_dev->dev, "err: no memory\n");
+ return -ENOMEM;
+ }
+
+ blocks_to_flash = load->size / FLASH_BLOCK;
+ while (load->size) {
+ struct genwqe_ddcb_cmd *req;
+
+ /*
+ * We must be 4 byte aligned. Buffer must be 0 appened
+ * to have defined values when calculating CRC.
+ */
+ tocopy = min_t(size_t, load->size, FLASH_BLOCK);
+
+ rc = copy_from_user(xbuf, buf, tocopy);
+ if (rc) {
+ dev_err(&pci_dev->dev,
+ "err: could not copy all data rc=%d\n", rc);
+ goto free_buffer;
+ }
+ crc = genwqe_crc32(xbuf, tocopy, 0xffffffff);
+
+ dev_info(&pci_dev->dev,
+ "[%s] DMA: 0x%llx CRC: %08x SZ: %ld %d\n",
+ __func__, dma_addr, crc, tocopy, blocks_to_flash);
+
+ /* prepare DDCB for SLU process */
+ req = ddcb_requ_alloc();
+ if (req == NULL) {
+ rc = -ENOMEM;
+ goto free_buffer;
+ }
+
+ req->cmd = SLCMD_MOVE_FLASH;
+ req->cmdopts = cmdopts;
+
+ /* prepare invariant values */
+ if (genwqe_get_slu_id(cd) <= 0x2) {
+ *(u64 *)&req->__asiv[0] = cpu_to_be64(dma_addr);
+ *(u64 *)&req->__asiv[8] = cpu_to_be64(tocopy);
+ *(u64 *)&req->__asiv[16] = cpu_to_be64(flash);
+ *(u32 *)&req->__asiv[24] = cpu_to_be32(0);
+ req->__asiv[24] = load->uid;
+ *(u32 *)&req->__asiv[28] = cpu_to_be32(crc);
+
+ /* for simulation only */
+ *(u64 *)&req->__asiv[88] = cpu_to_be64(load->slu_id);
+ *(u64 *)&req->__asiv[96] = cpu_to_be64(load->app_id);
+ req->asiv_length = 32; /* bytes included in crc calc */
+ } else { /* setup DDCB for ATS architecture */
+ *(u64 *)&req->asiv[0] = cpu_to_be64(dma_addr);
+ *(u32 *)&req->asiv[8] = cpu_to_be32(tocopy);
+ *(u32 *)&req->asiv[12] = cpu_to_be32(0); /* resvd */
+ *(u64 *)&req->asiv[16] = cpu_to_be64(flash);
+ *(u32 *)&req->asiv[24] = cpu_to_be32(load->uid<<24);
+ *(u32 *)&req->asiv[28] = cpu_to_be32(crc);
+
+ /* for simulation only */
+ *(u64 *)&req->asiv[80] = cpu_to_be64(load->slu_id);
+ *(u64 *)&req->asiv[88] = cpu_to_be64(load->app_id);
+
+ req->ats = cpu_to_be64(0x4ULL << 44); /* Rd only */
+ req->asiv_length = 40; /* bytes included in crc calc */
+ }
+ req->asv_length = 8;
+
+ /* For Genwqe5 we get back the calculated CRC */
+ *(u64 *)&req->asv[0] = 0ULL; /* 0x80 */
+
+ rc = __genwqe_execute_raw_ddcb(cd, req);
+
+ load->retc = req->retc;
+ load->attn = req->attn;
+ load->progress = req->progress;
+
+ if (rc < 0) {
+ dev_err(&pci_dev->dev,
+ " [%s] DDCB returned (RETC=%x ATTN=%x "
+ "PROG=%x rc=%d)\n", __func__, req->retc,
+ req->attn, req->progress, rc);
+
+ ddcb_requ_free(req);
+ goto free_buffer;
+ }
+
+ if (req->retc != DDCB_RETC_COMPLETE) {
+ dev_info(&pci_dev->dev,
+ " [%s] DDCB returned (RETC=%x ATTN=%x "
+ "PROG=%x)\n", __func__, req->retc,
+ req->attn, req->progress);
+
+ rc = -EIO;
+ ddcb_requ_free(req);
+ goto free_buffer;
+ }
+
+ load->size -= tocopy;
+ flash += tocopy;
+ buf += tocopy;
+ blocks_to_flash--;
+ ddcb_requ_free(req);
+ }
+
+ free_buffer:
+ __genwqe_free_consistent(cd, FLASH_BLOCK, xbuf, dma_addr);
+ return rc;
+}
+
+static int do_flash_read(struct genwqe_file *cfile,
+ struct genwqe_bitstream *load)
+{
+ int rc, blocks_to_flash;
+ u64 dma_addr, flash = 0;
+ size_t tocopy = 0;
+ u8 __user *buf;
+ u8 *xbuf;
+ u8 cmdopts;
+ struct genwqe_dev *cd = cfile->cd;
+ struct pci_dev *pci_dev = cd->pci_dev;
+ struct genwqe_ddcb_cmd *cmd;
+
+ if ((load->size & 0x3) != 0) {
+ dev_err(&pci_dev->dev,
+ "err: buf size %d bytes not 4 bytes aligned!\n",
+ load->size);
+ return -EINVAL;
+ }
+ if (((unsigned long)(load->data_addr) & ~PAGE_MASK) != 0) {
+ dev_err(&pci_dev->dev, "err: buf is not page aligned!\n");
+ return -EINVAL;
+ }
+
+ /* FIXME Bits have changed for new service layer! */
+ switch ((char)load->partition) {
+ case '0':
+ cmdopts = 0x12;
+ break; /* upload/part_0 */
+ case '1':
+ cmdopts = 0x1A;
+ break; /* upload/part_1 */
+ case 'v':
+ default:
+ dev_err(&pci_dev->dev,
+ "err: invalid partition %02x!\n", load->partition);
+ return -EINVAL;
+ }
+ dev_info(&pci_dev->dev,
+ "[%s] start flash read UID: 0x%x size: %u bytes part: %c\n",
+ __func__, load->uid, load->size, (char)load->partition);
+
+ buf = (u8 __user *)load->data_addr;
+ xbuf = __genwqe_alloc_consistent(cd, FLASH_BLOCK, &dma_addr);
+ if (xbuf == NULL) {
+ dev_err(&pci_dev->dev, "err: no memory\n");
+ return -ENOMEM;
+ }
+
+ blocks_to_flash = load->size / FLASH_BLOCK;
+ while (load->size) {
+ /*
+ * We must be 4 byte aligned. Buffer must be 0 appened
+ * to have defined values when calculating CRC.
+ */
+ tocopy = min_t(size_t, load->size, FLASH_BLOCK);
+
+ dev_info(&pci_dev->dev,
+ "[%s] DMA: 0x%llx SZ: %ld %d\n",
+ __func__, dma_addr, tocopy, blocks_to_flash);
+
+ /* prepare DDCB for SLU process */
+ cmd = ddcb_requ_alloc();
+ if (cmd == NULL) {
+ rc = -ENOMEM;
+ goto free_buffer;
+ }
+ cmd->cmd = SLCMD_MOVE_FLASH;
+ cmd->cmdopts = cmdopts;
+
+ /* prepare invariant values */
+ if (genwqe_get_slu_id(cd) <= 0x2) {
+ *(u64 *)&cmd->__asiv[0] = cpu_to_be64(dma_addr);
+ *(u64 *)&cmd->__asiv[8] = cpu_to_be64(tocopy);
+ *(u64 *)&cmd->__asiv[16] = cpu_to_be64(flash);
+ *(u32 *)&cmd->__asiv[24] = cpu_to_be32(0);
+ cmd->__asiv[24] = load->uid;
+ *(u32 *)&cmd->__asiv[28] = cpu_to_be32(0) /* CRC */;
+ cmd->asiv_length = 32; /* bytes included in crc calc */
+ } else { /* setup DDCB for ATS architecture */
+ *(u64 *)&cmd->asiv[0] = cpu_to_be64(dma_addr);
+ *(u32 *)&cmd->asiv[8] = cpu_to_be32(tocopy);
+ *(u32 *)&cmd->asiv[12] = cpu_to_be32(0); /* resvd */
+ *(u64 *)&cmd->asiv[16] = cpu_to_be64(flash);
+ *(u32 *)&cmd->asiv[24] = cpu_to_be32(load->uid<<24);
+ *(u32 *)&cmd->asiv[28] = cpu_to_be32(0); /* CRC */
+ cmd->ats = cpu_to_be64(0x5ULL << 44); /* rd/wr */
+ cmd->asiv_length = 40; /* bytes included in crc calc */
+ }
+ cmd->asv_length = 8;
+
+ /* we only get back the calculated CRC */
+ *(u64 *)&cmd->asv[0] = 0ULL; /* 0x80 */
+
+ rc = __genwqe_execute_raw_ddcb(cd, cmd);
+
+ load->retc = cmd->retc;
+ load->attn = cmd->attn;
+ load->progress = cmd->progress;
+
+ if ((rc < 0) && (rc != -EBADMSG)) {
+ dev_err(&pci_dev->dev,
+ " [%s] DDCB returned (RETC=%x ATTN=%x "
+ "PROG=%x rc=%d)\n", __func__, cmd->retc,
+ cmd->attn, cmd->progress, rc);
+ ddcb_requ_free(cmd);
+ goto free_buffer;
+ }
+
+ rc = copy_to_user(buf, xbuf, tocopy);
+ if (rc) {
+ dev_err(&pci_dev->dev,
+ " [%s] copy data to user failed rc=%d\n",
+ __func__, rc);
+ rc = -EIO;
+ ddcb_requ_free(cmd);
+ goto free_buffer;
+ }
+
+ /* We know that we can get retc 0x104 with CRC err */
+ if (((cmd->retc == DDCB_RETC_FAULT) &&
+ (cmd->attn != 0x02)) || /* Normally ignore CRC error */
+ ((cmd->retc == DDCB_RETC_COMPLETE) &&
+ (cmd->attn != 0x00))) { /* Everything was fine */
+ dev_err(&pci_dev->dev,
+ " [%s] DDCB returned (RETC=%x ATTN=%x "
+ "PROG=%x rc=%d)\n", __func__, cmd->retc,
+ cmd->attn, cmd->progress, rc);
+ rc = -EIO;
+ ddcb_requ_free(cmd);
+ goto free_buffer;
+ }
+
+ load->size -= tocopy;
+ flash += tocopy;
+ buf += tocopy;
+ blocks_to_flash--;
+ ddcb_requ_free(cmd);
+ }
+ rc = 0;
+
+ free_buffer:
+ __genwqe_free_consistent(cd, FLASH_BLOCK, xbuf, dma_addr);
+ return rc;
+}
+
+static int genwqe_pin_mem(struct genwqe_file *cfile, struct genwqe_mem *m)
+{
+ int rc;
+ struct genwqe_dev *cd = cfile->cd;
+ struct pci_dev *pci_dev = cfile->cd->pci_dev;
+ struct dma_mapping *dma_map;
+ unsigned long map_addr;
+ unsigned long map_size;
+
+ if ((m->addr == 0x0) || (m->size == 0))
+ return -EINVAL;
+
+ map_addr = (m->addr & PAGE_MASK);
+ map_size = round_up(m->size + (m->addr & ~PAGE_MASK), PAGE_SIZE);
+
+ dma_map = kzalloc(sizeof(struct dma_mapping), GFP_ATOMIC);
+ if (dma_map == NULL)
+ return -ENOMEM;
+
+ genwqe_mapping_init(dma_map, GENWQE_MAPPING_SGL_PINNED);
+ rc = genwqe_user_vmap(cd, dma_map, (void *)map_addr, map_size, NULL);
+ if (rc != 0) {
+ dev_err(&pci_dev->dev,
+ "[%s] genwqe_user_vmap rc=%d\n", __func__, rc);
+ return rc;
+ }
+
+ genwqe_add_pin(cfile, dma_map);
+ return 0;
+}
+
+static int genwqe_unpin_mem(struct genwqe_file *cfile, struct genwqe_mem *m)
+{
+ struct genwqe_dev *cd = cfile->cd;
+ struct dma_mapping *dma_map;
+ unsigned long map_addr;
+ unsigned long map_size;
+
+ if (m->addr == 0x0)
+ return -EINVAL;
+
+ map_addr = (m->addr & PAGE_MASK);
+ map_size = round_up(m->size + (m->addr & ~PAGE_MASK), PAGE_SIZE);
+
+ dma_map = genwqe_search_pin(cfile, map_addr, map_size, NULL);
+ if (dma_map == NULL)
+ return -ENOENT;
+
+ genwqe_del_pin(cfile, dma_map);
+ genwqe_user_vunmap(cd, dma_map, NULL);
+ kfree(dma_map);
+ return 0;
+}
+
+/**
+ * ddcb_cmd_cleanup() - Remove dynamically created fixup entries
+ *
+ * Only if there are any. Pinnings are not removed.
+ */
+static int ddcb_cmd_cleanup(struct genwqe_file *cfile, struct ddcb_requ *req)
+{
+ unsigned int i;
+ struct dma_mapping *dma_map;
+ struct genwqe_dev *cd = cfile->cd;
+
+ for (i = 0; i < DDCB_FIXUPS; i++) {
+ dma_map = &req->dma_mappings[i];
+
+ if (dma_mapping_used(dma_map)) {
+ __genwqe_del_mapping(cfile, dma_map);
+ genwqe_user_vunmap(cd, dma_map, req);
+ }
+ if (req->sgl[i] != NULL) {
+ genwqe_free_sgl(cd, req->sgl[i],
+ req->sgl_dma_addr[i],
+ req->sgl_size[i]);
+ req->sgl[i] = NULL;
+ req->sgl_dma_addr[i] = 0x0;
+ req->sgl_size[i] = 0;
+ }
+
+ }
+ return 0;
+}
+
+/**
+ * ddcb_cmd_fixups() - Establish DMA fixups/sglists for user memory references
+ *
+ * Before the DDCB gets executed we need to handle the fixups. We
+ * replace the user-space addresses with DMA addresses or do
+ * additional setup work e.g. generating a scatter-gather list which
+ * is used to describe the memory referred to in the fixup.
+ */
+static int ddcb_cmd_fixups(struct genwqe_file *cfile, struct ddcb_requ *req)
+{
+ int rc;
+ unsigned int asiv_offs, i;
+ struct genwqe_dev *cd = cfile->cd;
+ struct genwqe_ddcb_cmd *cmd = &req->cmd;
+ struct dma_mapping *m;
+ struct pci_dev *pci_dev = cd->pci_dev;
+ const char *type = "UNKNOWN";
+
+ for (i = 0, asiv_offs = 0x00; asiv_offs <= 0x58;
+ i++, asiv_offs += 0x08) {
+
+ u64 u_addr, d_addr;
+ u32 u_size = 0;
+ unsigned long ats_flags;
+
+ ats_flags = ATS_GET_FLAGS(be64_to_cpu(cmd->ats), asiv_offs);
+
+ switch (ats_flags) {
+
+ case ATS_TYPE_DATA:
+ break; /* nothing to do here */
+
+ case ATS_TYPE_FLAT_RDWR:
+ case ATS_TYPE_FLAT_RD: {
+ u_addr = be64_to_cpu(*((u64 *)&cmd->
+ asiv[asiv_offs]));
+ u_size = be32_to_cpu(*((u32 *)&cmd->
+ asiv[asiv_offs + 0x08]));
+
+ /*
+ * No data available. Ignore u_addr in this
+ * case and set addr to 0. Hardware must not
+ * fetch the buffer.
+ */
+ if (u_size == 0x0) {
+ *((u64 *)&cmd->asiv[asiv_offs]) =
+ cpu_to_be64(0x0);
+ break;
+ }
+
+ m = __genwqe_search_mapping(cfile, u_addr, u_size,
+ &d_addr, NULL);
+ if (m == NULL) {
+ rc = -EFAULT;
+ goto err_out;
+ }
+
+ *((u64 *)&cmd->asiv[asiv_offs]) = cpu_to_be64(d_addr);
+ break;
+ }
+
+ case ATS_TYPE_SGL_RDWR:
+ case ATS_TYPE_SGL_RD: {
+ int page_offs, nr_pages, offs;
+
+ u_addr = be64_to_cpu(*((u64 *)&cmd->asiv[asiv_offs]));
+ u_size = be32_to_cpu(*((u32 *)&cmd->asiv[asiv_offs +
+ 0x08]));
+
+ /*
+ * No data available. Ignore u_addr in this
+ * case and set addr to 0. Hardware must not
+ * fetch the empty sgl.
+ */
+ if (u_size == 0x0) {
+ *((u64 *)&cmd->asiv[asiv_offs]) =
+ cpu_to_be64(0x0);
+ break;
+ }
+
+ m = genwqe_search_pin(cfile, u_addr, u_size, NULL);
+ if (m != NULL) {
+ type = "PINNING";
+ page_offs = (u_addr -
+ (u64)m->u_vaddr)/PAGE_SIZE;
+ } else {
+ type = "MAPPING";
+ m = &req->dma_mappings[i];
+
+ genwqe_mapping_init(m,
+ GENWQE_MAPPING_SGL_TEMP);
+ rc = genwqe_user_vmap(cd, m, (void *)u_addr,
+ u_size, req);
+ if (rc != 0)
+ goto err_out;
+
+ __genwqe_add_mapping(cfile, m);
+ page_offs = 0;
+ }
+
+ offs = offset_in_page(u_addr);
+ nr_pages = DIV_ROUND_UP(offs + u_size, PAGE_SIZE);
+
+ /* create genwqe style scatter gather list */
+ req->sgl[i] = genwqe_alloc_sgl(cd, m->nr_pages,
+ &req->sgl_dma_addr[i],
+ &req->sgl_size[i]);
+ if (req->sgl[i] == NULL) {
+ rc = -ENOMEM;
+ goto err_out;
+ }
+ genwqe_setup_sgl(cd, offs, u_size,
+ req->sgl[i],
+ req->sgl_dma_addr[i],
+ req->sgl_size[i],
+ m->dma_list,
+ page_offs,
+ nr_pages);
+
+ *((u64 *)&cmd->asiv[asiv_offs]) =
+ cpu_to_be64(req->sgl_dma_addr[i]);
+
+ break;
+ }
+ default:
+ dev_err(&pci_dev->dev,
+ "[%s] err: invalid ATS flags %01lx\n",
+ __func__, ats_flags);
+ rc = -EINVAL;
+ goto err_out;
+ }
+ }
+ return 0;
+
+ err_out:
+ dev_err(&pci_dev->dev, "[%s] err: rc=%d\n", __func__, rc);
+ ddcb_cmd_cleanup(cfile, req);
+ return rc;
+}
+
+/**
+ * genwqe_execute_ddcb() - Execute DDCB using userspace address fixups
+ *
+ * The code will build up the translation tables or lookup the
+ * contignous memory allocation table to find the right translations
+ * and DMA addresses.
+ */
+static int genwqe_execute_ddcb(struct genwqe_file *cfile,
+ struct genwqe_ddcb_cmd *cmd)
+{
+ int rc;
+ struct genwqe_dev *cd = cfile->cd;
+ struct ddcb_requ *req = container_of(cmd, struct ddcb_requ, cmd);
+
+ rc = ddcb_cmd_fixups(cfile, req);
+ if (rc != 0)
+ return rc;
+
+ rc = __genwqe_execute_raw_ddcb(cd, cmd);
+ ddcb_cmd_cleanup(cfile, req);
+ return rc;
+}
+
+static int do_execute_ddcb(struct genwqe_file *cfile,
+ unsigned long arg, int raw)
+{
+ int rc;
+ struct genwqe_ddcb_cmd *cmd;
+ struct ddcb_requ *req;
+ struct genwqe_dev *cd = cfile->cd;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ cmd = ddcb_requ_alloc();
+ if (cmd == NULL)
+ return -ENOMEM;
+
+ req = container_of(cmd, struct ddcb_requ, cmd);
+
+ if (copy_from_user(cmd, (void __user *)arg, sizeof(*cmd))) {
+ dev_err(&pci_dev->dev,
+ "err: could not copy params from user\n");
+ ddcb_requ_free(cmd);
+ return -EFAULT;
+ }
+
+ if (!raw)
+ rc = genwqe_execute_ddcb(cfile, cmd);
+ else
+ rc = __genwqe_execute_raw_ddcb(cd, cmd);
+
+ /* Copy back only the modifed fields. Do not copy ASIV
+ back since the copy got modified by the driver. */
+ if (copy_to_user((void __user *)arg, cmd,
+ sizeof(*cmd) - DDCB_ASIV_LENGTH)) {
+ dev_err(&pci_dev->dev,
+ "err: could not copy params to user\n");
+ ddcb_requ_free(cmd);
+ return -EFAULT;
+ }
+
+ ddcb_requ_free(cmd);
+ return rc;
+}
+
+/**
+ * genwqe_ioctl() - IO control
+ * @filp: file handle
+ * @cmd: command identifier (passed from user)
+ * @arg: argument (passed from user)
+ *
+ * Return: 0 success
+ */
+static long genwqe_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ int rc = 0;
+ struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
+ struct genwqe_dev *cd = cfile->cd;
+ struct genwqe_reg_io __user *io;
+ u64 val;
+ u32 reg_offs;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ if (_IOC_TYPE(cmd) != GENWQE_IOC_CODE) {
+ dev_err(&pci_dev->dev, "err: ioctl code does not match!\n");
+ return -EINVAL;
+ }
+
+ switch (cmd) {
+
+ case GENWQE_GET_CARD_STATE:
+ put_user(cd->card_state, (enum genwqe_card_state __user *)arg);
+ return 0;
+
+ /* Register access */
+ case GENWQE_READ_REG64: {
+ io = (struct genwqe_reg_io __user *)arg;
+
+ if (get_user(reg_offs, &io->num)) {
+ dev_err(&pci_dev->dev, "err: reg read64\n");
+ return -EFAULT;
+ }
+ if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x7))
+ return -EINVAL;
+
+ val = __genwqe_readq(cd, reg_offs);
+ put_user(val, &io->val64);
+ return 0;
+ }
+
+ case GENWQE_WRITE_REG64: {
+ io = (struct genwqe_reg_io __user *)arg;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
+ return -EPERM;
+
+ if (get_user(reg_offs, &io->num)) {
+ dev_err(&pci_dev->dev, "err: reg write64\n");
+ return -EFAULT;
+ }
+ if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x7))
+ return -EINVAL;
+
+ if (get_user(val, &io->val64)) {
+ dev_err(&pci_dev->dev, "err: reg write64\n");
+ return -EFAULT;
+ }
+ __genwqe_writeq(cd, reg_offs, val);
+ return 0;
+ }
+
+ case GENWQE_READ_REG32: {
+ io = (struct genwqe_reg_io __user *)arg;
+
+ if (get_user(reg_offs, &io->num)) {
+ dev_err(&pci_dev->dev, "err: reg read32\n");
+ return -EFAULT;
+ }
+ if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x3))
+ return -EINVAL;
+
+ val = __genwqe_readl(cd, reg_offs);
+ put_user(val, &io->val64);
+ return 0;
+ }
+
+ case GENWQE_WRITE_REG32: {
+ io = (struct genwqe_reg_io __user *)arg;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
+ return -EPERM;
+
+ if (get_user(reg_offs, &io->num)) {
+ dev_err(&pci_dev->dev, "err: reg write32\n");
+ return -EFAULT;
+ }
+ if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x3))
+ return -EINVAL;
+
+ if (get_user(val, &io->val64)) {
+ dev_err(&pci_dev->dev, "err: reg write32\n");
+ return -EFAULT;
+ }
+ __genwqe_writel(cd, reg_offs, val);
+ return 0;
+ }
+
+ /* Flash update/reading */
+ case GENWQE_SLU_UPDATE: {
+ struct genwqe_bitstream load;
+
+ if (!genwqe_is_privileged(cd))
+ return -EPERM;
+
+ if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
+ return -EPERM;
+
+ if (copy_from_user(&load, (void __user *)arg, sizeof(load))) {
+ dev_err(&pci_dev->dev,
+ "err: could not copy params from user\n");
+ return -EFAULT;
+ }
+ rc = do_flash_update(cfile, &load);
+
+ if (copy_to_user((void __user *)arg, &load, sizeof(load))) {
+ dev_err(&pci_dev->dev,
+ "err: could not copy params to user\n");
+ return -EFAULT;
+ }
+ dev_info(&pci_dev->dev, "[%s] rc=%d\n", __func__, rc);
+ return rc;
+ }
+
+ case GENWQE_SLU_READ: {
+ struct genwqe_bitstream load;
+
+ if (!genwqe_is_privileged(cd))
+ return -EPERM;
+
+ if (genwqe_flash_readback_fails(cd))
+ return -ENOSPC; /* known to fail for old versions */
+
+ if (copy_from_user(&load, (void __user *)arg, sizeof(load))) {
+ dev_err(&pci_dev->dev,
+ "err: could not copy params from user\n");
+ return -EFAULT;
+ }
+ rc = do_flash_read(cfile, &load);
+
+ if (copy_to_user((void __user *)arg, &load, sizeof(load))) {
+ dev_err(&pci_dev->dev,
+ "err: could not copy params to user\n");
+ return -EFAULT;
+ }
+ dev_info(&pci_dev->dev, "[%s] rc=%d\n", __func__, rc);
+ return rc;
+ }
+
+ /* memory pinning and unpinning */
+ case GENWQE_PIN_MEM: {
+ struct genwqe_mem m;
+
+ if (copy_from_user(&m, (void __user *)arg, sizeof(m))) {
+ dev_err(&pci_dev->dev,
+ "err: could not copy params from user\n");
+ return -EFAULT;
+ }
+ return genwqe_pin_mem(cfile, &m);
+ }
+
+ case GENWQE_UNPIN_MEM: {
+ struct genwqe_mem m;
+
+ if (copy_from_user(&m, (void __user *)arg, sizeof(m))) {
+ dev_err(&pci_dev->dev,
+ "err: could not copy params from user\n");
+ return -EFAULT;
+ }
+ return genwqe_unpin_mem(cfile, &m);
+ }
+
+ /* launch an DDCB and wait for completion */
+ case GENWQE_EXECUTE_DDCB:
+ return do_execute_ddcb(cfile, arg, 0);
+
+ case GENWQE_EXECUTE_RAW_DDCB: {
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ dev_err(&pci_dev->dev,
+ "err: must be superuser execute raw DDCB!\n");
+ return -EPERM;
+ }
+ return do_execute_ddcb(cfile, arg, 1);
+ }
+
+ default:
+ pr_err("unknown ioctl %x/%lx**\n", cmd, arg);
+ return -EINVAL;
+ }
+
+ return rc;
+}
+
+#if defined(CONFIG_COMPAT)
+/**
+ * genwqe_compat_ioctl() - Compatibility ioctl
+ *
+ * Called whenever a 32-bit process running under a 64-bit kernel
+ * performs an ioctl on /dev/genwqe<n>_card.
+ *
+ * @filp: file pointer.
+ * @cmd: command.
+ * @arg: user argument.
+ * Return: zero on success or negative number on failure.
+ */
+static long genwqe_compat_ioctl(struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ return genwqe_ioctl(filp, cmd, arg);
+}
+#endif /* defined(CONFIG_COMPAT) */
+
+static const struct file_operations genwqe_fops = {
+ .owner = THIS_MODULE,
+ .open = genwqe_open,
+ .fasync = genwqe_fasync,
+ .mmap = genwqe_mmap,
+ .unlocked_ioctl = genwqe_ioctl,
+#if defined(CONFIG_COMPAT)
+ .compat_ioctl = genwqe_compat_ioctl,
+#endif
+ .release = genwqe_release,
+};
+
+static int genwqe_device_initialized(struct genwqe_dev *cd)
+{
+ return cd->dev != NULL;
+}
+
+/**
+ * genwqe_device_create() - Create and configure genwqe char device
+ * @cd: genwqe device descriptor
+ *
+ * This function must be called before we create any more genwqe
+ * character devices, because it is allocating the major and minor
+ * number which are supposed to be used by the client drivers.
+ */
+int genwqe_device_create(struct genwqe_dev *cd)
+{
+ int rc;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ /*
+ * Here starts the individual setup per client. It must
+ * initialize its own cdev data structure with its own fops.
+ * The appropriate devnum needs to be created. The ranges must
+ * not overlap.
+ */
+ rc = alloc_chrdev_region(&cd->devnum_genwqe, 0,
+ GENWQE_MAX_MINOR, GENWQE_DEVNAME);
+ if (rc < 0) {
+ dev_err(&pci_dev->dev, "err: alloc_chrdev_region failed\n");
+ goto err_dev;
+ }
+
+ cdev_init(&cd->cdev_genwqe, &genwqe_fops);
+ cd->cdev_genwqe.owner = THIS_MODULE;
+
+ rc = cdev_add(&cd->cdev_genwqe, cd->devnum_genwqe, 1);
+ if (rc < 0) {
+ dev_err(&pci_dev->dev, "err: cdev_add failed\n");
+ goto err_add;
+ }
+
+ /*
+ * Finally the device in /dev/... must be created. The rule is
+ * to use card%d_clientname for each created device.
+ */
+ cd->dev = device_create_with_groups(cd->class_genwqe,
+ &cd->pci_dev->dev,
+ cd->devnum_genwqe, cd,
+ genwqe_attribute_groups,
+ GENWQE_DEVNAME "%u_card",
+ cd->card_idx);
+ if (cd->dev == NULL) {
+ rc = -ENODEV;
+ goto err_cdev;
+ }
+
+ rc = genwqe_init_debugfs(cd);
+ if (rc != 0)
+ goto err_debugfs;
+
+ return 0;
+
+ err_debugfs:
+ device_destroy(cd->class_genwqe, cd->devnum_genwqe);
+ err_cdev:
+ cdev_del(&cd->cdev_genwqe);
+ err_add:
+ unregister_chrdev_region(cd->devnum_genwqe, GENWQE_MAX_MINOR);
+ err_dev:
+ cd->dev = NULL;
+ return rc;
+}
+
+static int genwqe_inform_and_stop_processes(struct genwqe_dev *cd)
+{
+ int rc;
+ unsigned int i;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ if (!genwqe_open_files(cd))
+ return 0;
+
+ dev_warn(&pci_dev->dev, "[%s] send SIGIO and wait ...\n", __func__);
+
+ rc = genwqe_kill_fasync(cd, SIGIO);
+ if (rc > 0) {
+ /* give kill_timeout seconds to close file descriptors ... */
+ for (i = 0; (i < genwqe_kill_timeout) &&
+ genwqe_open_files(cd); i++) {
+ dev_info(&pci_dev->dev, " %d sec ...", i);
+
+ cond_resched();
+ msleep(1000);
+ }
+
+ /* if no open files we can safely continue, else ... */
+ if (!genwqe_open_files(cd))
+ return 0;
+
+ dev_warn(&pci_dev->dev,
+ "[%s] send SIGKILL and wait ...\n", __func__);
+
+ rc = genwqe_force_sig(cd, SIGKILL); /* force terminate */
+ if (rc) {
+ /* Give kill_timout more seconds to end processes */
+ for (i = 0; (i < genwqe_kill_timeout) &&
+ genwqe_open_files(cd); i++) {
+ dev_warn(&pci_dev->dev, " %d sec ...", i);
+
+ cond_resched();
+ msleep(1000);
+ }
+ }
+ }
+ return 0;
+}
+
+/**
+ * genwqe_device_remove() - Remove genwqe's char device
+ *
+ * This function must be called after the client devices are removed
+ * because it will free the major/minor number range for the genwqe
+ * drivers.
+ *
+ * This function must be robust enough to be called twice.
+ */
+int genwqe_device_remove(struct genwqe_dev *cd)
+{
+ int rc;
+ struct pci_dev *pci_dev = cd->pci_dev;
+
+ if (!genwqe_device_initialized(cd))
+ return 1;
+
+ genwqe_inform_and_stop_processes(cd);
+
+ /*
+ * We currently do wait until all filedescriptors are
+ * closed. This leads to a problem when we abort the
+ * application which will decrease this reference from
+ * 1/unused to 0/illegal and not from 2/used 1/empty.
+ */
+ rc = atomic_read(&cd->cdev_genwqe.kobj.kref.refcount);
+ if (rc != 1) {
+ dev_err(&pci_dev->dev,
+ "[%s] err: cdev_genwqe...refcount=%d\n", __func__, rc);
+ panic("Fatal err: cannot free resources with pending references!");
+ }
+
+ genqwe_exit_debugfs(cd);
+ device_destroy(cd->class_genwqe, cd->devnum_genwqe);
+ cdev_del(&cd->cdev_genwqe);
+ unregister_chrdev_region(cd->devnum_genwqe, GENWQE_MAX_MINOR);
+ cd->dev = NULL;
+
+ return 0;
+}
projects / linux-beck.git / commitdiff