[SCSI] bfa: add debugfs support

- Add debugfs support to obtain firmware trace, driver trace
  and read/write to registers.

- debugfs hierarchy:
  /sys/kernel/debug/bfa/host#
   where the host number corresponds to the one under /sys/class/scsi_host/host#

- Following are the new debugfs entries added:
  drvtrc: collect current driver trace
  fwtrc: collect current firmware trace.
  fwsave: collect last saved fw trace as a result of firmware crash.
  regwr: write one word to chip register
  regrd: read one or more words from chip register.

Signed-off-by: Jing Huang <huangj@brocade.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/scsi/bfa/bfad.c b/drivers/scsi/bfa/bfad.c
index a17800e6277d..915a29d6c7ad 100644
--- a/drivers/scsi/bfa/bfad.c
+++ b/drivers/scsi/bfa/bfad.c
@@ -57,6 +57,7 @@ static int      ipfc_enable = BFA_FALSE;
 static int      fdmi_enable = BFA_TRUE;
 int             bfa_lun_queue_depth = BFAD_LUN_QUEUE_DEPTH;
 int             bfa_linkup_delay = -1;
+int             bfa_debugfs_enable = 1;
 
 module_param(os_name, charp, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(os_name, "OS name of the hba host machine");
@@ -106,6 +107,9 @@ MODULE_PARM_DESC(bfa_linkup_delay, "Link up delay, default=30 secs for boot"
 module_param(fdmi_enable, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(fdmi_enable, "Enables fdmi registration, default=1,"
                 " Range[false:0|true:1]");
+module_param(bfa_debugfs_enable, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(bfa_debugfs_enable, "Enables debugfs feature, default=1,"
+                " Range[false:0|true:1]");
 
 /*
  * Stores the module parm num_sgpgs value;
@@ -903,6 +907,10 @@ bfad_cfg_pport(struct bfad_s *bfad, enum bfa_port_role role)
                 bfad->pport.roles |= BFA_PORT_ROLE_FCP_IM;
         }
 
+        /* Setup the debugfs node for this scsi_host */
+        if (bfa_debugfs_enable)
+                bfad_debugfs_init(&bfad->pport);
+
         bfad->bfad_flags |= BFAD_CFG_PPORT_DONE;
 
 out:
@@ -912,6 +920,10 @@ out:
 void
 bfad_uncfg_pport(struct bfad_s *bfad)
 {
+         /* Remove the debugfs node for this scsi_host */
+        kfree(bfad->regdata);
+        bfad_debugfs_exit(&bfad->pport);
+
         if ((bfad->pport.roles & BFA_PORT_ROLE_FCP_IPFC) && ipfc_enable) {
                 bfad_ipfc_port_delete(bfad, &bfad->pport);
                 bfad->pport.roles &= ~BFA_PORT_ROLE_FCP_IPFC;