[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, 11 insertions, 1 deletions

diff --git a/drivers/scsi/bfa/bfad_drv.h b/drivers/scsi/bfa/bfad_drv.h
index fb6ac1d3fd17..465b8b86ec9c 100644
--- a/drivers/scsi/bfa/bfad_drv.h
+++ b/drivers/scsi/bfa/bfad_drv.h
@@ -111,6 +111,9 @@ struct bfad_port_s {
         struct bfad_im_port_s *im_port; /* IM specific data */
         struct bfad_tm_port_s *tm_port; /* TM specific data */
         struct bfad_ipfc_port_s *ipfc_port;     /* IPFC specific data */
+
+        /* port debugfs specific data */
+        struct dentry *port_debugfs_root;
 };
 
 /*
@@ -186,6 +189,10 @@ struct bfad_s {
         struct fc_host_statistics link_stats;
         struct list_head pbc_pcfg_list;
         atomic_t wq_reqcnt;
+        /* debugfs specific data */
+        char *regdata;
+        u32 reglen;
+        struct dentry *bfad_dentry_files[5];
 };
 
 struct bfad_pcfg_s {
@@ -276,7 +283,9 @@ void		bfad_drv_uninit(struct bfad_s *bfad);
 void            bfad_drv_log_level_set(struct bfad_s *bfad);
 bfa_status_t    bfad_fc4_module_init(void);
 void            bfad_fc4_module_exit(void);
-int             bfad_worker (void *ptr);
+int             bfad_worker(void *ptr);
+void            bfad_debugfs_init(struct bfad_port_s *port);
+void            bfad_debugfs_exit(struct bfad_port_s *port);
 
 void bfad_pci_remove(struct pci_dev *pdev);
 int bfad_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid);
@@ -289,6 +298,7 @@ extern struct list_head bfad_list;
 extern int bfa_lun_queue_depth;
 extern int bfad_supported_fc4s;
 extern int bfa_linkup_delay;
+extern int bfa_debugfs_enable;
 extern struct mutex bfad_mutex;
 
 #endif /* __BFAD_DRV_H__ */