fnic_res.o \
fnic_fcs.o \
fnic_scsi.o \
+ fnic_trace.o \
+ fnic_debugfs.o \
vnic_cq.o \
vnic_dev.o \
vnic_intr.o \
#include <scsi/libfcoe.h>
#include "fnic_io.h"
#include "fnic_res.h"
+#include "fnic_trace.h"
#include "vnic_dev.h"
#include "vnic_wq.h"
#include "vnic_rq.h"
--- /dev/null
+/*
+ * Copyright 2012 Cisco Systems, Inc. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/debugfs.h>
+#include "fnic.h"
+
+static struct dentry *fnic_trace_debugfs_root;
+static struct dentry *fnic_trace_debugfs_file;
+static struct dentry *fnic_trace_enable;
+
+/*
+ * fnic_trace_ctrl_open - Open the trace_enable file
+ * @inode: The inode pointer.
+ * @file: The file pointer to attach the trace enable/disable flag.
+ *
+ * Description:
+ * This routine opens a debugsfs file trace_enable.
+ *
+ * Returns:
+ * This function returns zero if successful.
+ */
+static int fnic_trace_ctrl_open(struct inode *inode, struct file *filp)
+{
+ filp->private_data = inode->i_private;
+ return 0;
+}
+
+/*
+ * fnic_trace_ctrl_read - Read a trace_enable debugfs file
+ * @filp: The file pointer to read from.
+ * @ubuf: The buffer to copy the data to.
+ * @cnt: The number of bytes to read.
+ * @ppos: The position in the file to start reading from.
+ *
+ * Description:
+ * This routine reads value of variable fnic_tracing_enabled
+ * and stores into local @buf. It will start reading file at @ppos and
+ * copy up to @cnt of data to @ubuf from @buf.
+ *
+ * Returns:
+ * This function returns the amount of data that was read.
+ */
+static ssize_t fnic_trace_ctrl_read(struct file *filp,
+ char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ char buf[64];
+ int len;
+ len = sprintf(buf, "%u\n", fnic_tracing_enabled);
+
+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, len);
+}
+
+/*
+ * fnic_trace_ctrl_write - Write to trace_enable debugfs file
+ * @filp: The file pointer to write from.
+ * @ubuf: The buffer to copy the data from.
+ * @cnt: The number of bytes to write.
+ * @ppos: The position in the file to start writing to.
+ *
+ * Description:
+ * This routine writes data from user buffer @ubuf to buffer @buf and
+ * sets fnic_tracing_enabled value as per user input.
+ *
+ * Returns:
+ * This function returns the amount of data that was written.
+ */
+static ssize_t fnic_trace_ctrl_write(struct file *filp,
+ const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ char buf[64];
+ unsigned long val;
+ int ret;
+
+ if (cnt >= sizeof(buf))
+ return -EINVAL;
+
+ if (copy_from_user(&buf, ubuf, cnt))
+ return -EFAULT;
+
+ buf[cnt] = 0;
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret < 0)
+ return ret;
+
+ fnic_tracing_enabled = val;
+ (*ppos)++;
+
+ return cnt;
+}
+
+/*
+ * fnic_trace_debugfs_open - Open the fnic trace log
+ * @inode: The inode pointer
+ * @file: The file pointer to attach the log output
+ *
+ * Description:
+ * This routine is the entry point for the debugfs open file operation.
+ * It allocates the necessary buffer for the log, fills the buffer from
+ * the in-memory log and then returns a pointer to that log in
+ * the private_data field in @file.
+ *
+ * Returns:
+ * This function returns zero if successful. On error it will return
+ * a negative error value.
+ */
+static int fnic_trace_debugfs_open(struct inode *inode,
+ struct file *file)
+{
+ fnic_dbgfs_t *fnic_dbg_prt;
+ fnic_dbg_prt = kzalloc(sizeof(fnic_dbgfs_t), GFP_KERNEL);
+ if (!fnic_dbg_prt)
+ return -ENOMEM;
+
+ fnic_dbg_prt->buffer = vmalloc((3*(trace_max_pages * PAGE_SIZE)));
+ if (!fnic_dbg_prt->buffer)
+ return -ENOMEM;
+ memset((void *)fnic_dbg_prt->buffer, 0,
+ (3*(trace_max_pages * PAGE_SIZE)));
+ fnic_dbg_prt->buffer_len = fnic_get_trace_data(fnic_dbg_prt);
+ file->private_data = fnic_dbg_prt;
+ return 0;
+}
+
+/*
+ * fnic_trace_debugfs_lseek - Seek through a debugfs file
+ * @file: The file pointer to seek through.
+ * @offset: The offset to seek to or the amount to seek by.
+ * @howto: Indicates how to seek.
+ *
+ * Description:
+ * This routine is the entry point for the debugfs lseek file operation.
+ * The @howto parameter indicates whether @offset is the offset to directly
+ * seek to, or if it is a value to seek forward or reverse by. This function
+ * figures out what the new offset of the debugfs file will be and assigns
+ * that value to the f_pos field of @file.
+ *
+ * Returns:
+ * This function returns the new offset if successful and returns a negative
+ * error if unable to process the seek.
+ */
+static loff_t fnic_trace_debugfs_lseek(struct file *file,
+ loff_t offset,
+ int howto)
+{
+ fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
+ loff_t pos = -1;
+
+ switch (howto) {
+ case 0:
+ pos = offset;
+ break;
+ case 1:
+ pos = file->f_pos + offset;
+ break;
+ case 2:
+ pos = fnic_dbg_prt->buffer_len - offset;
+ }
+ return (pos < 0 || pos > fnic_dbg_prt->buffer_len) ?
+ -EINVAL : (file->f_pos = pos);
+}
+
+/*
+ * fnic_trace_debugfs_read - Read a debugfs file
+ * @file: The file pointer to read from.
+ * @ubuf: The buffer to copy the data to.
+ * @nbytes: The number of bytes to read.
+ * @pos: The position in the file to start reading from.
+ *
+ * Description:
+ * This routine reads data from the buffer indicated in the private_data
+ * field of @file. It will start reading at @pos and copy up to @nbytes of
+ * data to @ubuf.
+ *
+ * Returns:
+ * This function returns the amount of data that was read (this could be
+ * less than @nbytes if the end of the file was reached).
+ */
+static ssize_t fnic_trace_debugfs_read(struct file *file,
+ char __user *ubuf,
+ size_t nbytes,
+ loff_t *pos)
+{
+ fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
+ int rc = 0;
+ rc = simple_read_from_buffer(ubuf, nbytes, pos,
+ fnic_dbg_prt->buffer,
+ fnic_dbg_prt->buffer_len);
+ return rc;
+}
+
+/*
+ * fnic_trace_debugfs_release - Release the buffer used to store
+ * debugfs file data
+ * @inode: The inode pointer
+ * @file: The file pointer that contains the buffer to release
+ *
+ * Description:
+ * This routine frees the buffer that was allocated when the debugfs
+ * file was opened.
+ *
+ * Returns:
+ * This function returns zero.
+ */
+static int fnic_trace_debugfs_release(struct inode *inode,
+ struct file *file)
+{
+ fnic_dbgfs_t *fnic_dbg_prt = file->private_data;
+
+ vfree(fnic_dbg_prt->buffer);
+ kfree(fnic_dbg_prt);
+ return 0;
+}
+
+static const struct file_operations fnic_trace_ctrl_fops = {
+ .owner = THIS_MODULE,
+ .open = fnic_trace_ctrl_open,
+ .read = fnic_trace_ctrl_read,
+ .write = fnic_trace_ctrl_write,
+};
+
+static const struct file_operations fnic_trace_debugfs_fops = {
+ .owner = THIS_MODULE,
+ .open = fnic_trace_debugfs_open,
+ .llseek = fnic_trace_debugfs_lseek,
+ .read = fnic_trace_debugfs_read,
+ .release = fnic_trace_debugfs_release,
+};
+
+/*
+ * fnic_trace_debugfs_init - Initialize debugfs for fnic trace logging
+ *
+ * Description:
+ * When Debugfs is configured this routine sets up the fnic debugfs
+ * file system. If not already created, this routine will create the
+ * fnic directory. It will create file trace to log fnic trace buffer
+ * output into debugfs and it will also create file trace_enable to
+ * control enable/disable of trace logging into trace buffer.
+ */
+int fnic_trace_debugfs_init(void)
+{
+ int rc = -1;
+ fnic_trace_debugfs_root = debugfs_create_dir("fnic", NULL);
+ if (!fnic_trace_debugfs_root) {
+ printk(KERN_DEBUG "Cannot create debugfs root\n");
+ return rc;
+ }
+ fnic_trace_enable = debugfs_create_file("tracing_enable",
+ S_IFREG|S_IRUGO|S_IWUSR,
+ fnic_trace_debugfs_root,
+ NULL, &fnic_trace_ctrl_fops);
+
+ if (!fnic_trace_enable) {
+ printk(KERN_DEBUG "Cannot create trace_enable file"
+ " under debugfs");
+ return rc;
+ }
+
+ fnic_trace_debugfs_file = debugfs_create_file("trace",
+ S_IFREG|S_IRUGO|S_IWUSR,
+ fnic_trace_debugfs_root,
+ NULL,
+ &fnic_trace_debugfs_fops);
+
+ if (!fnic_trace_debugfs_file) {
+ printk(KERN_DEBUG "Cannot create trace file under debugfs");
+ return rc;
+ }
+ rc = 0;
+ return rc;
+}
+
+/*
+ * fnic_trace_debugfs_terminate - Tear down debugfs infrastructure
+ *
+ * Description:
+ * When Debugfs is configured this routine removes debugfs file system
+ * elements that are specific to fnic trace logging.
+ */
+void fnic_trace_debugfs_terminate(void)
+{
+ if (fnic_trace_debugfs_file) {
+ debugfs_remove(fnic_trace_debugfs_file);
+ fnic_trace_debugfs_file = NULL;
+ }
+ if (fnic_trace_enable) {
+ debugfs_remove(fnic_trace_enable);
+ fnic_trace_enable = NULL;
+ }
+ if (fnic_trace_debugfs_root) {
+ debugfs_remove(fnic_trace_debugfs_root);
+ fnic_trace_debugfs_root = NULL;
+ }
+}
module_param(fnic_log_level, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(fnic_log_level, "bit mask of fnic logging levels");
+unsigned int fnic_trace_max_pages = 16;
+module_param(fnic_trace_max_pages, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(fnic_trace_max_pages, "Total allocated memory pages "
+ "for fnic trace buffer");
static struct libfc_function_template fnic_transport_template = {
.frame_send = fnic_send,
printk(KERN_INFO PFX "%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
+ /* Allocate memory for trace buffer */
+ err = fnic_trace_buf_init();
+ if (err < 0) {
+ printk(KERN_ERR PFX "Trace buffer initialization Failed "
+ "Fnic Tracing utility is disabled\n");
+ fnic_trace_free();
+ }
+
/* Create a cache for allocation of default size sgls */
len = sizeof(struct fnic_dflt_sgl_list);
fnic_sgl_cache[FNIC_SGL_CACHE_DFLT] = kmem_cache_create
err_create_fnic_sgl_slab_max:
kmem_cache_destroy(fnic_sgl_cache[FNIC_SGL_CACHE_DFLT]);
err_create_fnic_sgl_slab_dflt:
+ fnic_trace_free();
return err;
}
kmem_cache_destroy(fnic_sgl_cache[FNIC_SGL_CACHE_DFLT]);
kmem_cache_destroy(fnic_io_req_cache);
fc_release_transport(fnic_fc_transport);
+ fnic_trace_free();
}
module_init(fnic_init_module);
{
struct fc_lport *lp = shost_priv(sc->device->host);
struct fc_rport *rport;
- struct fnic_io_req *io_req;
+ struct fnic_io_req *io_req = NULL;
struct fnic *fnic = lport_priv(lp);
struct vnic_wq_copy *wq;
int ret;
- int sg_count;
+ u64 cmd_trace;
+ int sg_count = 0;
unsigned long flags;
unsigned long ptr;
/* Map the data buffer */
sg_count = scsi_dma_map(sc);
if (sg_count < 0) {
+ FNIC_TRACE((u64)fnic_queuecommand, sc->device->host->host_no,
+ sc->request->tag, (u64)sc, 0, sc->cmnd[0],
+ sg_count, CMD_STATE(sc));
mempool_free(io_req, fnic->io_req_pool);
goto out;
}
* refetch the pointer under the lock.
*/
spinlock_t *io_lock = fnic_io_lock_hash(fnic, sc);
-
+ FNIC_TRACE((u64)fnic_queuecommand, sc->device->host->host_no,
+ sc->request->tag, (u64)sc, 0, 0, 0,
+ (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
spin_lock_irqsave(io_lock, flags);
io_req = (struct fnic_io_req *)CMD_SP(sc);
CMD_SP(sc) = NULL;
CMD_FLAGS(sc) |= FNIC_IO_ISSUED;
}
out:
+ cmd_trace = ((u64)sc->cmnd[0] << 56 | (u64)sc->cmnd[7] << 40 |
+ (u64)sc->cmnd[8] << 32 | (u64)sc->cmnd[2] << 24 |
+ (u64)sc->cmnd[3] << 16 | (u64)sc->cmnd[4] << 8 |
+ sc->cmnd[5]);
+
+ FNIC_TRACE((u64)fnic_queuecommand, sc->device->host->host_no,
+ sc->request->tag, (u64)sc, (u64)io_req,
+ sg_count, cmd_trace,
+ (((u64)CMD_FLAGS(sc) >> 32) | CMD_STATE(sc)));
atomic_dec(&fnic->in_flight);
/* acquire host lock before returning to SCSI */
spin_lock(lp->host->host_lock);
struct vnic_wq_copy *wq;
u16 request_out = desc->u.ack.request_out;
unsigned long flags;
+ u64 *ox_id_tag = (u64 *)(void *)desc;
/* mark the ack state */
wq = &fnic->wq_copy[cq_index - fnic->raw_wq_count - fnic->rq_count];
fnic->fw_ack_recd[0] = 1;
}
spin_unlock_irqrestore(&fnic->wq_copy_lock[0], flags);
+ FNIC_TRACE((u64)fnic_fcpio_ack_handler,
+ fnic->lport->host->host_no, 0, 0, ox_id_tag[2], ox_id_tag[3],
+ ox_id_tag[4], ox_id_tag[5]);
}
/*
struct scsi_cmnd *sc;
unsigned long flags;
spinlock_t *io_lock;
+ u64 cmd_trace;
unsigned long start_time;
/* Decode the cmpl description to get the io_req id */
"icmnd_cmpl sc is null - "
"hdr status = %s tag = 0x%x desc = 0x%p\n",
fnic_fcpio_status_to_str(hdr_status), id, desc);
+ FNIC_TRACE((u64)fnic_fcpio_icmnd_cmpl_handler,
+ fnic->lport->host->host_no, id,
+ ((u64)icmnd_cmpl->_resvd0[1] << 16 |
+ (u64)icmnd_cmpl->_resvd0[0]),
+ ((u64)hdr_status << 16 |
+ (u64)icmnd_cmpl->scsi_status << 8 |
+ (u64)icmnd_cmpl->flags), (u64)desc,
+ (u64)icmnd_cmpl->residual, 0);
return;
}
mempool_free(io_req, fnic->io_req_pool);
+ cmd_trace = ((u64)hdr_status << 56) |
+ (u64)icmnd_cmpl->scsi_status << 48 |
+ (u64)icmnd_cmpl->flags << 40 | (u64)sc->cmnd[0] << 32 |
+ (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
+ (u64)sc->cmnd[4] << 8 | sc->cmnd[5];
+
+ FNIC_TRACE((u64)fnic_fcpio_icmnd_cmpl_handler,
+ sc->device->host->host_no, id, (u64)sc,
+ ((u64)icmnd_cmpl->_resvd0[1] << 56 |
+ (u64)icmnd_cmpl->_resvd0[0] << 48 |
+ jiffies_to_msecs(jiffies - start_time)),
+ (u64)desc, cmd_trace,
+ (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
+
if (sc->sc_data_direction == DMA_FROM_DEVICE) {
fnic->lport->host_stats.fcp_input_requests++;
fnic->fcp_input_bytes += xfer_len;
/* Call SCSI completion function to complete the IO */
if (sc->scsi_done)
sc->scsi_done(sc);
-
}
/* fnic_fcpio_itmf_cmpl_handler
fnic_release_ioreq_buf(fnic, io_req, sc);
mempool_free(io_req, fnic->io_req_pool);
- if (sc->scsi_done)
+ if (sc->scsi_done) {
+ FNIC_TRACE((u64)fnic_fcpio_itmf_cmpl_handler,
+ sc->device->host->host_no, id,
+ (u64)sc,
+ jiffies_to_msecs(jiffies - start_time),
+ (u64)desc,
+ (((u64)hdr_status << 40) |
+ (u64)sc->cmnd[0] << 32 |
+ (u64)sc->cmnd[2] << 24 |
+ (u64)sc->cmnd[3] << 16 |
+ (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
+ (((u64)CMD_FLAGS(sc) << 32) |
+ CMD_STATE(sc)));
sc->scsi_done(sc);
+ }
}
} else if (id & FNIC_TAG_DEV_RST) {
if (CMD_STATE(sc) == FNIC_IOREQ_ABTS_PENDING) {
spin_unlock_irqrestore(io_lock, flags);
CMD_FLAGS(sc) |= FNIC_DEV_RST_ABTS_PENDING;
+ FNIC_TRACE((u64)fnic_fcpio_itmf_cmpl_handler,
+ sc->device->host->host_no, id, (u64)sc,
+ jiffies_to_msecs(jiffies - start_time),
+ (u64)desc, 0,
+ (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Terminate pending "
"dev reset cmpl recd. id %d status %s\n",
if (CMD_FLAGS(sc) & FNIC_DEV_RST_TIMED_OUT) {
/* Need to wait for terminate completion */
spin_unlock_irqrestore(io_lock, flags);
+ FNIC_TRACE((u64)fnic_fcpio_itmf_cmpl_handler,
+ sc->device->host->host_no, id, (u64)sc,
+ jiffies_to_msecs(jiffies - start_time),
+ (u64)desc, 0,
+ (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"dev reset cmpl recd after time out. "
"id %d status %s\n",
" DID_TRANSPORT_DISRUPTED\n");
/* Complete the command to SCSI */
- if (sc->scsi_done)
+ if (sc->scsi_done) {
+ FNIC_TRACE((u64)fnic_cleanup_io,
+ sc->device->host->host_no, i, (u64)sc,
+ jiffies_to_msecs(jiffies - start_time),
+ 0, ((u64)sc->cmnd[0] << 32 |
+ (u64)sc->cmnd[2] << 24 |
+ (u64)sc->cmnd[3] << 16 |
+ (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
+ (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
+
sc->scsi_done(sc);
+ }
}
}
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host, "wq_copy_cleanup_handler:"
" DID_NO_CONNECT\n");
- if (sc->scsi_done)
+ if (sc->scsi_done) {
+ FNIC_TRACE((u64)fnic_wq_copy_cleanup_handler,
+ sc->device->host->host_no, id, (u64)sc,
+ jiffies_to_msecs(jiffies - start_time),
+ 0, ((u64)sc->cmnd[0] << 32 |
+ (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
+ (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
+ (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
+
sc->scsi_done(sc);
+ }
}
static inline int fnic_queue_abort_io_req(struct fnic *fnic, int tag,
{
struct fc_lport *lp;
struct fnic *fnic;
- struct fnic_io_req *io_req;
+ struct fnic_io_req *io_req = NULL;
struct fc_rport *rport;
spinlock_t *io_lock;
unsigned long flags;
CMD_FLAGS(sc) = FNIC_NO_FLAGS;
-
if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
ret = FAILED;
goto fnic_abort_cmd_end;
mempool_free(io_req, fnic->io_req_pool);
fnic_abort_cmd_end:
+ FNIC_TRACE((u64)fnic_abort_cmd, sc->device->host->host_no,
+ sc->request->tag, (u64)sc,
+ jiffies_to_msecs(jiffies - start_time),
+ 0, ((u64)sc->cmnd[0] << 32 |
+ (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
+ (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
+ (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
+
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"Returning from abort cmd type %x %s\n", task_req,
(ret == SUCCESS) ?
{
struct fc_lport *lp;
struct fnic *fnic;
- struct fnic_io_req *io_req;
+ struct fnic_io_req *io_req = NULL;
struct fc_rport *rport;
int status;
int ret = FAILED;
unsigned long flags;
unsigned long start_time = 0;
struct scsi_lun fc_lun;
- int tag;
+ int tag = 0;
DECLARE_COMPLETION_ONSTACK(tm_done);
int tag_gen_flag = 0; /*to track tags allocated by fnic driver*/
}
fnic_device_reset_end:
+ FNIC_TRACE((u64)fnic_device_reset, sc->device->host->host_no,
+ sc->request->tag, (u64)sc,
+ jiffies_to_msecs(jiffies - start_time),
+ 0, ((u64)sc->cmnd[0] << 32 |
+ (u64)sc->cmnd[2] << 24 | (u64)sc->cmnd[3] << 16 |
+ (u64)sc->cmnd[4] << 8 | sc->cmnd[5]),
+ (((u64)CMD_FLAGS(sc) << 32) | CMD_STATE(sc)));
+
/* free tag if it is allocated */
if (unlikely(tag_gen_flag))
fnic_scsi_host_end_tag(fnic, sc);
--- /dev/null
+/*
+ * Copyright 2012 Cisco Systems, Inc. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/module.h>
+#include <linux/mempool.h>
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <linux/version.h>
+#include <linux/kallsyms.h>
+#include "fnic_io.h"
+#include "fnic.h"
+
+unsigned int trace_max_pages;
+static int fnic_max_trace_entries;
+
+static u64 fnic_trace_buf_p;
+static DEFINE_SPINLOCK(fnic_trace_lock);
+
+static fnic_trace_dbg_t fnic_trace_entries;
+int fnic_tracing_enabled = 1;
+
+/*
+ * fnic_trace_get_buf - Give buffer pointer to user to fill up trace information
+ *
+ * Description:
+ * This routine gets next available trace buffer entry location @wr_idx
+ * from allocated trace buffer pages and give that memory location
+ * to user to store the trace information.
+ *
+ * Return Value:
+ * This routine returns pointer to next available trace entry
+ * @fnic_buf_head for user to fill trace information.
+ */
+fnic_trace_data_t *fnic_trace_get_buf(void)
+{
+ u64 fnic_buf_head;
+ unsigned long flags;
+
+ spin_lock_irqsave(&fnic_trace_lock, flags);
+
+ /*
+ * Get next available memory location for writing trace information
+ * at @wr_idx and increment @wr_idx
+ */
+ fnic_buf_head =
+ fnic_trace_entries.page_offset[fnic_trace_entries.wr_idx];
+ fnic_trace_entries.wr_idx++;
+
+ /*
+ * Verify if trace buffer is full then change wd_idx to
+ * start from zero
+ */
+ if (fnic_trace_entries.wr_idx >= fnic_max_trace_entries)
+ fnic_trace_entries.wr_idx = 0;
+
+ /*
+ * Verify if write index @wr_idx and read index @rd_idx are same then
+ * increment @rd_idx to move to next entry in trace buffer
+ */
+ if (fnic_trace_entries.wr_idx == fnic_trace_entries.rd_idx) {
+ fnic_trace_entries.rd_idx++;
+ if (fnic_trace_entries.rd_idx >= fnic_max_trace_entries)
+ fnic_trace_entries.rd_idx = 0;
+ }
+ spin_unlock_irqrestore(&fnic_trace_lock, flags);
+ return (fnic_trace_data_t *)fnic_buf_head;
+}
+
+/*
+ * fnic_get_trace_data - Copy trace buffer to a memory file
+ * @fnic_dbgfs_t: pointer to debugfs trace buffer
+ *
+ * Description:
+ * This routine gathers the fnic trace debugfs data from the fnic_trace_data_t
+ * buffer and dumps it to fnic_dbgfs_t. It will start at the rd_idx entry in
+ * the log and process the log until the end of the buffer. Then it will gather
+ * from the beginning of the log and process until the current entry @wr_idx.
+ *
+ * Return Value:
+ * This routine returns the amount of bytes that were dumped into fnic_dbgfs_t
+ */
+int fnic_get_trace_data(fnic_dbgfs_t *fnic_dbgfs_prt)
+{
+ int rd_idx;
+ int wr_idx;
+ int len = 0;
+ unsigned long flags;
+ char str[KSYM_SYMBOL_LEN];
+ struct timespec val;
+ fnic_trace_data_t *tbp;
+
+ spin_lock_irqsave(&fnic_trace_lock, flags);
+ rd_idx = fnic_trace_entries.rd_idx;
+ wr_idx = fnic_trace_entries.wr_idx;
+ if (wr_idx < rd_idx) {
+ while (1) {
+ /* Start from read index @rd_idx */
+ tbp = (fnic_trace_data_t *)
+ fnic_trace_entries.page_offset[rd_idx];
+ if (!tbp) {
+ spin_unlock_irqrestore(&fnic_trace_lock, flags);
+ return 0;
+ }
+ /* Convert function pointer to function name */
+ sprint_symbol(str, tbp->fnaddr);
+ jiffies_to_timespec(tbp->timestamp, &val);
+ /*
+ * Dump trace buffer entry to memory file
+ * and increment read index @rd_idx
+ */
+ len += snprintf(fnic_dbgfs_prt->buffer + len,
+ (trace_max_pages * PAGE_SIZE * 3) - len,
+ "%16lu.%16lu %-50s %8x %8x %16llx %16llx "
+ "%16llx %16llx %16llx\n", val.tv_sec,
+ val.tv_nsec, str, tbp->host_no, tbp->tag,
+ tbp->data[0], tbp->data[1], tbp->data[2],
+ tbp->data[3], tbp->data[4]);
+ rd_idx++;
+ /*
+ * If rd_idx is reached to maximum trace entries
+ * then move rd_idx to zero
+ */
+ if (rd_idx > (fnic_max_trace_entries-1))
+ rd_idx = 0;
+ /*
+ * Continure dumpping trace buffer entries into
+ * memory file till rd_idx reaches write index
+ */
+ if (rd_idx == wr_idx)
+ break;
+ }
+ } else if (wr_idx > rd_idx) {
+ while (1) {
+ /* Start from read index @rd_idx */
+ tbp = (fnic_trace_data_t *)
+ fnic_trace_entries.page_offset[rd_idx];
+ if (!tbp) {
+ spin_unlock_irqrestore(&fnic_trace_lock, flags);
+ return 0;
+ }
+ jiffies_to_timespec(tbp->timestamp, &val);
+ /* Convert function pointer to function name */
+ sprint_symbol(str, tbp->fnaddr);
+ /*
+ * Dump trace buffer entry to memory file
+ * and increment read index @rd_idx
+ */
+ len += snprintf(fnic_dbgfs_prt->buffer + len,
+ (trace_max_pages * PAGE_SIZE * 3) - len,
+ "%16lu.%16lu %-50s %8x %8x %16llx %16llx "
+ "%16llx %16llx %16llx\n", val.tv_sec,
+ val.tv_nsec, str, tbp->host_no, tbp->tag,
+ tbp->data[0], tbp->data[1], tbp->data[2],
+ tbp->data[3], tbp->data[4]);
+ rd_idx++;
+ /*
+ * Continue dumpping trace buffer entries into
+ * memory file till rd_idx reaches write index
+ */
+ if (rd_idx == wr_idx)
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&fnic_trace_lock, flags);
+ return len;
+}
+
+/*
+ * fnic_trace_buf_init - Initialize fnic trace buffer logging facility
+ *
+ * Description:
+ * Initialize trace buffer data structure by allocating required memory and
+ * setting page_offset information for every trace entry by adding trace entry
+ * length to previous page_offset value.
+ */
+int fnic_trace_buf_init(void)
+{
+ u64 fnic_buf_head;
+ int i;
+ int err = 0;
+
+ trace_max_pages = fnic_trace_max_pages;
+ fnic_max_trace_entries = (trace_max_pages * PAGE_SIZE)/
+ FNIC_ENTRY_SIZE_BYTES;
+
+ fnic_trace_buf_p = (u64)vmalloc((trace_max_pages * PAGE_SIZE));
+ if (!fnic_trace_buf_p) {
+ printk(KERN_ERR PFX "Failed to allocate memory "
+ "for fnic_trace_buf_p\n");
+ err = -ENOMEM;
+ goto err_fnic_trace_buf_init;
+ }
+ memset((void *)fnic_trace_buf_p, 0, (trace_max_pages * PAGE_SIZE));
+
+ fnic_trace_entries.page_offset = (u64 *)vmalloc(fnic_max_trace_entries *
+ sizeof(unsigned long long));
+ if (!fnic_trace_entries.page_offset) {
+ printk(KERN_ERR PFX "Failed to allocate memory for"
+ " page_offset\n");
+ if (fnic_trace_buf_p) {
+ vfree((void *)fnic_trace_buf_p);
+ fnic_trace_buf_p = 0;
+ }
+ err = -ENOMEM;
+ goto err_fnic_trace_buf_init;
+ }
+ memset((void *)fnic_trace_entries.page_offset, 0,
+ (fnic_max_trace_entries * sizeof(unsigned long long)));
+ fnic_trace_entries.wr_idx = fnic_trace_entries.rd_idx = 0;
+ fnic_buf_head = fnic_trace_buf_p;
+
+ /*
+ * Set page_offset field of fnic_trace_entries struct by
+ * calculating memory location for every trace entry using
+ * length of each trace entry
+ */
+ for (i = 0; i < fnic_max_trace_entries; i++) {
+ fnic_trace_entries.page_offset[i] = fnic_buf_head;
+ fnic_buf_head += FNIC_ENTRY_SIZE_BYTES;
+ }
+ err = fnic_trace_debugfs_init();
+ if (err < 0) {
+ printk(KERN_ERR PFX "Failed to initialize debugfs for tracing\n");
+ goto err_fnic_trace_debugfs_init;
+ }
+ printk(KERN_INFO PFX "Successfully Initialized Trace Buffer\n");
+ return err;
+err_fnic_trace_debugfs_init:
+ fnic_trace_free();
+err_fnic_trace_buf_init:
+ return err;
+}
+
+/*
+ * fnic_trace_free - Free memory of fnic trace data structures.
+ */
+void fnic_trace_free(void)
+{
+ fnic_tracing_enabled = 0;
+ fnic_trace_debugfs_terminate();
+ if (fnic_trace_entries.page_offset) {
+ vfree((void *)fnic_trace_entries.page_offset);
+ fnic_trace_entries.page_offset = NULL;
+ }
+ if (fnic_trace_buf_p) {
+ vfree((void *)fnic_trace_buf_p);
+ fnic_trace_buf_p = 0;
+ }
+ printk(KERN_INFO PFX "Successfully Freed Trace Buffer\n");
+}
--- /dev/null
+/*
+ * Copyright 2012 Cisco Systems, Inc. All rights reserved.
+ *
+ * This program is free software; you may redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef __FNIC_TRACE_H__
+#define __FNIC_TRACE_H__
+
+#define FNIC_ENTRY_SIZE_BYTES 64
+
+extern ssize_t simple_read_from_buffer(void __user *to,
+ size_t count,
+ loff_t *ppos,
+ const void *from,
+ size_t available);
+
+extern unsigned int fnic_trace_max_pages;
+extern int fnic_tracing_enabled;
+extern unsigned int trace_max_pages;
+
+typedef struct fnic_trace_dbg {
+ int wr_idx;
+ int rd_idx;
+ unsigned long long *page_offset;
+} fnic_trace_dbg_t;
+
+typedef struct fnic_dbgfs {
+ int buffer_len;
+ char *buffer;
+} fnic_dbgfs_t;
+
+struct fnic_trace_data {
+ u64 timestamp;
+ u64 fnaddr;
+ u32 host_no;
+ u32 tag;
+ u64 data[5];
+} __attribute__((__packed__));
+
+typedef struct fnic_trace_data fnic_trace_data_t;
+
+#define FNIC_TRACE_ENTRY_SIZE \
+ (FNIC_ENTRY_SIZE_BYTES - sizeof(fnic_trace_data_t))
+
+#define FNIC_TRACE(_fn, _hn, _t, _a, _b, _c, _d, _e) \
+ if (unlikely(fnic_tracing_enabled)) { \
+ fnic_trace_data_t *trace_buf = fnic_trace_get_buf(); \
+ if (trace_buf) { \
+ trace_buf->timestamp = jiffies; \
+ trace_buf->fnaddr = _fn; \
+ trace_buf->host_no = _hn; \
+ trace_buf->tag = _t; \
+ trace_buf->data[0] = _a; \
+ trace_buf->data[1] = _b; \
+ trace_buf->data[2] = _c; \
+ trace_buf->data[3] = _d; \
+ trace_buf->data[4] = _e; \
+ } \
+ }
+
+fnic_trace_data_t *fnic_trace_get_buf(void);
+int fnic_get_trace_data(fnic_dbgfs_t *);
+int fnic_trace_buf_init(void);
+void fnic_trace_free(void);
+int fnic_trace_debugfs_init(void);
+void fnic_trace_debugfs_terminate(void);
+
+#endif
projects / karo-tx-linux.git / commitdiff