[SCSI] lpfc 8.3.33: Add Interrupts per second stats via debugfs

Signed-off-by: James Smart <james.smart@emulex.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 19 insertions, 1 deletions

diff --git a/drivers/scsi/lpfc/lpfc_sli.c b/drivers/scsi/lpfc/lpfc_sli.c
index 982bd40353ec..83a1c9e4902d 100644
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -2825,10 +2825,26 @@ lpfc_sli_rsp_pointers_error(struct lpfc_hba *phba, struct lpfc_sli_ring *pring)
 void lpfc_poll_eratt(unsigned long ptr)
 {
         struct lpfc_hba *phba;
-        uint32_t eratt = 0;
+        uint32_t eratt = 0, rem;
+        uint64_t sli_intr, cnt;
 
         phba = (struct lpfc_hba *)ptr;
 
+        /* Here we will also keep track of interrupts per sec of the hba */
+        sli_intr = phba->sli.slistat.sli_intr;
+
+        if (phba->sli.slistat.sli_prev_intr > sli_intr)
+                cnt = (((uint64_t)(-1) - phba->sli.slistat.sli_prev_intr) +
+                        sli_intr);
+        else
+                cnt = (sli_intr - phba->sli.slistat.sli_prev_intr);
+
+        /* 64-bit integer division not supporte on 32-bit x86 - use do_div */
+        rem = do_div(cnt, LPFC_ERATT_POLL_INTERVAL);
+        phba->sli.slistat.sli_ips = cnt;
+
+        phba->sli.slistat.sli_prev_intr = sli_intr;
+
         /* Check chip HA register for error event */
         eratt = lpfc_sli_check_eratt(phba);
 
diff --git a/drivers/scsi/lpfc/lpfc_sli.h b/drivers/scsi/lpfc/lpfc_sli.h
index 4b9b44e8e064..2f48d000a3b4 100644
--- a/drivers/scsi/lpfc/lpfc_sli.h
+++ b/drivers/scsi/lpfc/lpfc_sli.h
@@ -255,6 +255,8 @@ struct lpfc_sli_stat {
         uint64_t mbox_stat_err;  /* Mbox cmds completed status error */
         uint64_t mbox_cmd;       /* Mailbox commands issued */
         uint64_t sli_intr;       /* Count of Host Attention interrupts */
+        uint64_t sli_prev_intr;  /* Previous cnt of Host Attention interrupts */
+        uint64_t sli_ips;        /* Host Attention interrupts per sec */
         uint32_t err_attn_event; /* Error Attn event counters */
         uint32_t link_event;     /* Link event counters */
         uint32_t mbox_event;     /* Mailbox event counters */