[SCSI] megaraid_sas: prints pending cmds before setting hw_crit_error

This patch adds function to print the pending frame details before returning
failure from the reset routine. It also exposes a new variable megasas_dbg_lvl
that allows the user to set the debug level for logging.

Signed-off-by: Sumant Patro <Sumant.Patro@lsil.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

2 files changed, 94 insertions, 0 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index c3b50b375799..0791d62b167f 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -71,6 +71,8 @@ static struct megasas_mgmt_info megasas_mgmt_info;
 static struct fasync_struct *megasas_async_queue;
 static DEFINE_MUTEX(megasas_async_queue_mutex);
 
+static u32 megasas_dbg_lvl;
+
 /**
  * megasas_get_cmd -    Get a command from the free pool
  * @instance:           Adapter soft state
@@ -758,6 +760,69 @@ static inline int megasas_is_ldio(struct scsi_cmnd *cmd)
         }
 }
 
+ /**
+ * megasas_dump_pending_frames -        Dumps the frame address of all pending cmds
+ *                                      in FW
+ * @instance:                           Adapter soft state
+ */
+static inline void
+megasas_dump_pending_frames(struct megasas_instance *instance)
+{
+        struct megasas_cmd *cmd;
+        int i,n;
+        union megasas_sgl *mfi_sgl;
+        struct megasas_io_frame *ldio;
+        struct megasas_pthru_frame *pthru;
+        u32 sgcount;
+        u32 max_cmd = instance->max_fw_cmds;
+
+        printk(KERN_ERR "\nmegasas[%d]: Dumping Frame Phys Address of all pending cmds in FW\n",instance->host->host_no);
+        printk(KERN_ERR "megasas[%d]: Total OS Pending cmds : %d\n",instance->host->host_no,atomic_read(&instance->fw_outstanding));
+        if (IS_DMA64)
+                printk(KERN_ERR "\nmegasas[%d]: 64 bit SGLs were sent to FW\n",instance->host->host_no);
+        else
+                printk(KERN_ERR "\nmegasas[%d]: 32 bit SGLs were sent to FW\n",instance->host->host_no);
+
+        printk(KERN_ERR "megasas[%d]: Pending OS cmds in FW : \n",instance->host->host_no);
+        for (i = 0; i < max_cmd; i++) {
+                cmd = instance->cmd_list[i];
+                if(!cmd->scmd)
+                        continue;
+                printk(KERN_ERR "megasas[%d]: Frame addr :0x%08lx : ",instance->host->host_no,(unsigned long)cmd->frame_phys_addr);
+                if (megasas_is_ldio(cmd->scmd)){
+                        ldio = (struct megasas_io_frame *)cmd->frame;
+                        mfi_sgl = &ldio->sgl;
+                        sgcount = ldio->sge_count;
+                        printk(KERN_ERR "megasas[%d]: frame count : 0x%x, Cmd : 0x%x, Tgt id : 0x%x, lba lo : 0x%x, lba_hi : 0x%x, sense_buf addr : 0x%x,sge count : 0x%x\n",instance->host->host_no, cmd->frame_count,ldio->cmd,ldio->target_id, ldio->start_lba_lo,ldio->start_lba_hi,ldio->sense_buf_phys_addr_lo,sgcount);
+                }
+                else {
+                        pthru = (struct megasas_pthru_frame *) cmd->frame;
+                        mfi_sgl = &pthru->sgl;
+                        sgcount = pthru->sge_count;
+                        printk(KERN_ERR "megasas[%d]: frame count : 0x%x, Cmd : 0x%x, Tgt id : 0x%x, lun : 0x%x, cdb_len : 0x%x, data xfer len : 0x%x, sense_buf addr : 0x%x,sge count : 0x%x\n",instance->host->host_no,cmd->frame_count,pthru->cmd,pthru->target_id,pthru->lun,pthru->cdb_len , pthru->data_xfer_len,pthru->sense_buf_phys_addr_lo,sgcount);
+                }
+        if(megasas_dbg_lvl & MEGASAS_DBG_LVL){
+                for (n = 0; n < sgcount; n++){
+                        if (IS_DMA64)
+                                printk(KERN_ERR "megasas: sgl len : 0x%x, sgl addr : 0x%08lx ",mfi_sgl->sge64[n].length , (unsigned long)mfi_sgl->sge64[n].phys_addr) ;
+                        else
+                                printk(KERN_ERR "megasas: sgl len : 0x%x, sgl addr : 0x%x ",mfi_sgl->sge32[n].length , mfi_sgl->sge32[n].phys_addr) ;
+                        }
+                }
+                printk(KERN_ERR "\n");
+        } /*for max_cmd*/
+        printk(KERN_ERR "\nmegasas[%d]: Pending Internal cmds in FW : \n",instance->host->host_no);
+        for (i = 0; i < max_cmd; i++) {
+
+                cmd = instance->cmd_list[i];
+
+                if(cmd->sync_cmd == 1){
+                        printk(KERN_ERR "0x%08lx : ", (unsigned long)cmd->frame_phys_addr);
+                }
+        }
+        printk(KERN_ERR "megasas[%d]: Dumping Done.\n\n",instance->host->host_no);
+}
+
 /**
  * megasas_queue_command -      Queue entry point
  * @scmd:                       SCSI command to be queued
@@ -869,6 +934,7 @@ static int megasas_wait_for_outstanding(struct megasas_instance *instance)
                 */
                 writel(MFI_STOP_ADP,
                                 &instance->reg_set->inbound_doorbell);
+                megasas_dump_pending_frames(instance);
                 instance->hw_crit_error = 1;
                 return FAILED;
         }
@@ -2236,6 +2302,8 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
         instance->unique_id = pdev->bus->number << 8 | pdev->devfn;
         instance->init_id = MEGASAS_DEFAULT_INIT_ID;
 
+        megasas_dbg_lvl = 0;
+
         /*
          * Initialize MFI Firmware
          */
@@ -2862,6 +2930,26 @@ megasas_sysfs_show_release_date(struct device_driver *dd, char *buf)
 static DRIVER_ATTR(release_date, S_IRUGO, megasas_sysfs_show_release_date,
                    NULL);
 
+static ssize_t
+megasas_sysfs_show_dbg_lvl(struct device_driver *dd, char *buf)
+{
+        return sprintf(buf,"%u",megasas_dbg_lvl);
+}
+
+static ssize_t
+megasas_sysfs_set_dbg_lvl(struct device_driver *dd, const char *buf, size_t count)
+{
+        int retval = count;
+        if(sscanf(buf,"%u",&megasas_dbg_lvl)<1){
+                printk(KERN_ERR "megasas: could not set dbg_lvl\n");
+                retval = -EINVAL;
+        }
+        return retval;
+}
+
+static DRIVER_ATTR(dbg_lvl, S_IRUGO|S_IWUGO, megasas_sysfs_show_dbg_lvl,
+                   megasas_sysfs_set_dbg_lvl);
+
 /**
  * megasas_init - Driver load entry point
  */
@@ -2902,6 +2990,8 @@ static int __init megasas_init(void)
         driver_create_file(&megasas_pci_driver.driver, &driver_attr_version);
         driver_create_file(&megasas_pci_driver.driver,
                            &driver_attr_release_date);
+        driver_create_file(&megasas_pci_driver.driver,
+                           &driver_attr_dbg_lvl);
 
         return rval;
 }
@@ -2914,6 +3004,8 @@ static void __exit megasas_exit(void)
         driver_remove_file(&megasas_pci_driver.driver, &driver_attr_version);
         driver_remove_file(&megasas_pci_driver.driver,
                            &driver_attr_release_date);
+        driver_remove_file(&megasas_pci_driver.driver,
+                           &driver_attr_dbg_lvl);
 
         pci_unregister_driver(&megasas_pci_driver);
         unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 74feffe2fff3..ad7ef7444069 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -537,6 +537,8 @@ struct megasas_ctrl_info {
 #define MEGASAS_MAX_LUN                         8
 #define MEGASAS_MAX_LD                          64
 
+#define MEGASAS_DBG_LVL                         1
+
 /*
  * When SCSI mid-layer calls driver's reset routine, driver waits for
  * MEGASAS_RESET_WAIT_TIME seconds for all outstanding IO to complete. Note