[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>

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);
 

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 */