[SCSI] add scsi trace core functions and put trace points

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@jp.fujitsu.com>
Signed-off-by: Kei Tokunaga <tokunaga.keiich@jp.fujitsu.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

4 files changed, 196 insertions, 0 deletions

diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 92a8c500b23d..1c7ac49be649 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -162,6 +162,7 @@ scsi_mod-y			+= scsi_scan.o scsi_sysfs.o scsi_devinfo.o
 scsi_mod-$(CONFIG_SCSI_NETLINK) += scsi_netlink.o
 scsi_mod-$(CONFIG_SYSCTL)       += scsi_sysctl.o
 scsi_mod-$(CONFIG_SCSI_PROC_FS) += scsi_proc.o
+scsi_mod-y                      += scsi_trace.o
 
 scsi_tgt-y                      += scsi_tgt_lib.o scsi_tgt_if.o
 
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 1c08f6164658..ad0ed212db4a 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -67,6 +67,9 @@
 #include "scsi_priv.h"
 #include "scsi_logging.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/scsi.h>
+
 static void scsi_done(struct scsi_cmnd *cmd);
 
 /*
@@ -747,10 +750,12 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
                 cmd->result = (DID_NO_CONNECT << 16);
                 scsi_done(cmd);
         } else {
+                trace_scsi_dispatch_cmd_start(cmd);
                 rtn = host->hostt->queuecommand(cmd, scsi_done);
         }
         spin_unlock_irqrestore(host->host_lock, flags);
         if (rtn) {
+                trace_scsi_dispatch_cmd_error(cmd, rtn);
                 if (rtn != SCSI_MLQUEUE_DEVICE_BUSY &&
                     rtn != SCSI_MLQUEUE_TARGET_BUSY)
                         rtn = SCSI_MLQUEUE_HOST_BUSY;
@@ -781,6 +786,7 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
  */
 static void scsi_done(struct scsi_cmnd *cmd)
 {
+        trace_scsi_dispatch_cmd_done(cmd);
         blk_complete_request(cmd->request);
 }
 
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 33175974b55a..f31d868f9362 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -39,6 +39,8 @@
 #include "scsi_logging.h"
 #include "scsi_transport_api.h"
 
+#include <trace/events/scsi.h>
+
 #define SENSE_TIMEOUT           (10*HZ)
 
 /*
@@ -52,6 +54,7 @@
 void scsi_eh_wakeup(struct Scsi_Host *shost)
 {
         if (shost->host_busy == shost->host_failed) {
+                trace_scsi_eh_wakeup(shost);
                 wake_up_process(shost->ehandler);
                 SCSI_LOG_ERROR_RECOVERY(5,
                                 printk("Waking error handler thread\n"));
@@ -127,6 +130,7 @@ enum blk_eh_timer_return scsi_times_out(struct request *req)
         struct scsi_cmnd *scmd = req->special;
         enum blk_eh_timer_return rtn = BLK_EH_NOT_HANDLED;
 
+        trace_scsi_dispatch_cmd_timeout(scmd);
         scsi_log_completion(scmd, TIMEOUT_ERROR);
 
         if (scmd->device->host->transportt->eh_timed_out)
diff --git a/drivers/scsi/scsi_trace.c b/drivers/scsi/scsi_trace.c
new file mode 100644
index 000000000000..9a3342a2fa36
--- /dev/null
+++ b/drivers/scsi/scsi_trace.c
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) 2010 FUJITSU LIMITED
+ * Copyright (C) 2010 Tomohiro Kusumi <kusumi.tomohiro@jp.fujitsu.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+#include <linux/kernel.h>
+#include <linux/trace_seq.h>
+#include <trace/events/scsi.h>
+
+#define SERVICE_ACTION(cdb) ((cdb[8] << 8) | cdb[9])
+
+static const char *
+scsi_trace_misc(struct trace_seq *, unsigned char *, int);
+
+static const char *
+scsi_trace_rw6(struct trace_seq *p, unsigned char *cdb, int len)
+{
+        const char *ret = p->buffer + p->len;
+        sector_t lba = 0, txlen = 0;
+
+        lba |= ((cdb[1] & 0x1F) << 16);
+        lba |=  (cdb[2] << 8);
+        lba |=   cdb[3];
+        txlen = cdb[4];
+
+        trace_seq_printf(p, "lba=%llu txlen=%llu",
+                         (unsigned long long)lba, (unsigned long long)txlen);
+        trace_seq_putc(p, 0);
+
+        return ret;
+}
+
+static const char *
+scsi_trace_rw10(struct trace_seq *p, unsigned char *cdb, int len)
+{
+        const char *ret = p->buffer + p->len;
+        sector_t lba = 0, txlen = 0;
+
+        lba |= (cdb[2] << 24);
+        lba |= (cdb[3] << 16);
+        lba |= (cdb[4] << 8);
+        lba |=  cdb[5];
+        txlen |= (cdb[7] << 8);
+        txlen |=  cdb[8];
+
+        trace_seq_printf(p, "lba=%llu txlen=%llu",
+                         (unsigned long long)lba, (unsigned long long)txlen);
+        trace_seq_putc(p, 0);
+
+        return ret;
+}
+
+static const char *
+scsi_trace_rw12(struct trace_seq *p, unsigned char *cdb, int len)
+{
+        const char *ret = p->buffer + p->len;
+        sector_t lba = 0, txlen = 0;
+
+        lba |= (cdb[2] << 24);
+        lba |= (cdb[3] << 16);
+        lba |= (cdb[4] << 8);
+        lba |=  cdb[5];
+        txlen |= (cdb[6] << 24);
+        txlen |= (cdb[7] << 16);
+        txlen |= (cdb[8] << 8);
+        txlen |=  cdb[9];
+
+        trace_seq_printf(p, "lba=%llu txlen=%llu",
+                         (unsigned long long)lba, (unsigned long long)txlen);
+        trace_seq_putc(p, 0);
+
+        return ret;
+}
+
+static const char *
+scsi_trace_rw16(struct trace_seq *p, unsigned char *cdb, int len)
+{
+        const char *ret = p->buffer + p->len;
+        sector_t lba = 0, txlen = 0;
+
+        lba |= ((u64)cdb[2] << 56);
+        lba |= ((u64)cdb[3] << 48);
+        lba |= ((u64)cdb[4] << 40);
+        lba |= ((u64)cdb[5] << 32);
+        lba |= (cdb[6] << 24);
+        lba |= (cdb[7] << 16);
+        lba |= (cdb[8] << 8);
+        lba |=  cdb[9];
+        txlen |= (cdb[10] << 24);
+        txlen |= (cdb[11] << 16);
+        txlen |= (cdb[12] << 8);
+        txlen |=  cdb[13];
+
+        trace_seq_printf(p, "lba=%llu txlen=%llu",
+                         (unsigned long long)lba, (unsigned long long)txlen);
+        trace_seq_putc(p, 0);
+
+        return ret;
+}
+
+static const char *
+scsi_trace_rw32(struct trace_seq *p, unsigned char *cdb, int len)
+{
+        const char *ret = p->buffer + p->len;
+        sector_t lba = 0, txlen = 0;
+
+        lba |= ((u64)cdb[12] << 56);
+        lba |= ((u64)cdb[13] << 48);
+        lba |= ((u64)cdb[14] << 40);
+        lba |= ((u64)cdb[15] << 32);
+        lba |= (cdb[16] << 24);
+        lba |= (cdb[17] << 16);
+        lba |= (cdb[18] << 8);
+        lba |=  cdb[19];
+        txlen |= (cdb[28] << 24);
+        txlen |= (cdb[29] << 16);
+        txlen |= (cdb[30] << 8);
+        txlen |=  cdb[31];
+
+        trace_seq_printf(p, "%s_32 lba=%llu txlen=%llu",
+                        (SERVICE_ACTION(cdb) == READ_32 ? "READ" : "WRITE"),
+                        (unsigned long long)lba, (unsigned long long)txlen);
+
+        trace_seq_putc(p, 0);
+
+        return ret;
+}
+
+static const char *
+scsi_trace_varlen(struct trace_seq *p, unsigned char *cdb, int len)
+{
+        switch (SERVICE_ACTION(cdb)) {
+        case READ_32:
+        case WRITE_32:
+                return scsi_trace_rw32(p, cdb, len);
+        default:
+                return scsi_trace_misc(p, cdb, len);
+        }
+}
+
+static const char *
+scsi_trace_misc(struct trace_seq *p, unsigned char *cdb, int len)
+{
+        const char *ret = p->buffer + p->len;
+
+        trace_seq_printf(p, "-");
+        trace_seq_putc(p, 0);
+
+        return ret;
+}
+
+const char *
+scsi_trace_parse_cdb(struct trace_seq *p, unsigned char *cdb, int len)
+{
+        switch (cdb[0]) {
+        case READ_6:
+        case WRITE_6:
+                return scsi_trace_rw6(p, cdb, len);
+        case READ_10:
+        case WRITE_10:
+                return scsi_trace_rw10(p, cdb, len);
+        case READ_12:
+        case WRITE_12:
+                return scsi_trace_rw12(p, cdb, len);
+        case READ_16:
+        case WRITE_16:
+                return scsi_trace_rw16(p, cdb, len);
+        case VARIABLE_LENGTH_CMD:
+                return scsi_trace_varlen(p, cdb, len);
+        default:
+                return scsi_trace_misc(p, cdb, len);
+        }
+}