[SCSI] bfa: kdump fix

Root cause: When kernel crashes, bfa IOC state machine and FW doesn't get
a notification and hence are not cleanly shutdown. So registers holding
driver/IOC state information are not reset back to valid disabled/parking
values. This causes subsequent driver initialization to hang during kdump
kernel boot.

Fix description: during the initialization of first PCI function, reset
corresponding register when unclean shutown is detect by reading chip
registers. This will make sure that ioc/fw gets clean re-initialization.

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

4 files changed, 41 insertions, 1 deletions

diff --git a/drivers/scsi/bfa/bfa_ioc.c b/drivers/scsi/bfa/bfa_ioc.c
index c1f72c49196f..6c7e0339dda4 100644
--- a/drivers/scsi/bfa/bfa_ioc.c
+++ b/drivers/scsi/bfa/bfa_ioc.c
@@ -56,6 +56,8 @@ BFA_TRC_FILE(CNA, IOC);
 #define bfa_ioc_map_port(__ioc) ((__ioc)->ioc_hwif->ioc_map_port(__ioc))
 #define bfa_ioc_notify_fail(__ioc)              \
                         ((__ioc)->ioc_hwif->ioc_notify_fail(__ioc))
+#define bfa_ioc_sync_start(__ioc)               \
+                        ((__ioc)->ioc_hwif->ioc_sync_start(__ioc))
 #define bfa_ioc_sync_join(__ioc)                \
                         ((__ioc)->ioc_hwif->ioc_sync_join(__ioc))
 #define bfa_ioc_sync_leave(__ioc)               \
@@ -647,7 +649,7 @@ bfa_iocpf_sm_fwcheck(struct bfa_iocpf_s *iocpf, enum iocpf_event event)
         switch (event) {
         case IOCPF_E_SEMLOCKED:
                 if (bfa_ioc_firmware_lock(ioc)) {
-                        if (bfa_ioc_sync_complete(ioc)) {
+                        if (bfa_ioc_sync_start(ioc)) {
                                 iocpf->retry_count = 0;
                                 bfa_ioc_sync_join(ioc);
                                 bfa_fsm_set_state(iocpf, bfa_iocpf_sm_hwinit);
diff --git a/drivers/scsi/bfa/bfa_ioc.h b/drivers/scsi/bfa/bfa_ioc.h
index ec9cf08b0e7f..c85182a704fb 100644
--- a/drivers/scsi/bfa/bfa_ioc.h
+++ b/drivers/scsi/bfa/bfa_ioc.h
@@ -263,6 +263,7 @@ struct bfa_ioc_hwif_s {
                                         bfa_boolean_t msix);
         void            (*ioc_notify_fail)      (struct bfa_ioc_s *ioc);
         void            (*ioc_ownership_reset)  (struct bfa_ioc_s *ioc);
+        bfa_boolean_t   (*ioc_sync_start)       (struct bfa_ioc_s *ioc);
         void            (*ioc_sync_join)        (struct bfa_ioc_s *ioc);
         void            (*ioc_sync_leave)       (struct bfa_ioc_s *ioc);
         void            (*ioc_sync_ack)         (struct bfa_ioc_s *ioc);
diff --git a/drivers/scsi/bfa/bfa_ioc_cb.c b/drivers/scsi/bfa/bfa_ioc_cb.c
index e4a0713185b6..89ae4c8f95a2 100644
--- a/drivers/scsi/bfa/bfa_ioc_cb.c
+++ b/drivers/scsi/bfa/bfa_ioc_cb.c
@@ -32,6 +32,7 @@ static void bfa_ioc_cb_map_port(struct bfa_ioc_s *ioc);
 static void bfa_ioc_cb_isr_mode_set(struct bfa_ioc_s *ioc, bfa_boolean_t msix);
 static void bfa_ioc_cb_notify_fail(struct bfa_ioc_s *ioc);
 static void bfa_ioc_cb_ownership_reset(struct bfa_ioc_s *ioc);
+static bfa_boolean_t bfa_ioc_cb_sync_start(struct bfa_ioc_s *ioc);
 static void bfa_ioc_cb_sync_join(struct bfa_ioc_s *ioc);
 static void bfa_ioc_cb_sync_leave(struct bfa_ioc_s *ioc);
 static void bfa_ioc_cb_sync_ack(struct bfa_ioc_s *ioc);
@@ -53,6 +54,7 @@ bfa_ioc_set_cb_hwif(struct bfa_ioc_s *ioc)
         hwif_cb.ioc_isr_mode_set = bfa_ioc_cb_isr_mode_set;
         hwif_cb.ioc_notify_fail = bfa_ioc_cb_notify_fail;
         hwif_cb.ioc_ownership_reset = bfa_ioc_cb_ownership_reset;
+        hwif_cb.ioc_sync_start = bfa_ioc_cb_sync_start;
         hwif_cb.ioc_sync_join = bfa_ioc_cb_sync_join;
         hwif_cb.ioc_sync_leave = bfa_ioc_cb_sync_leave;
         hwif_cb.ioc_sync_ack = bfa_ioc_cb_sync_ack;
@@ -195,6 +197,15 @@ bfa_ioc_cb_isr_mode_set(struct bfa_ioc_s *ioc, bfa_boolean_t msix)
 }
 
 /*
+ * Synchronized IOC failure processing routines
+ */
+static bfa_boolean_t
+bfa_ioc_cb_sync_start(struct bfa_ioc_s *ioc)
+{
+        return bfa_ioc_cb_sync_complete(ioc);
+}
+
+/*
  * Cleanup hw semaphore and usecnt registers
  */
 static void
diff --git a/drivers/scsi/bfa/bfa_ioc_ct.c b/drivers/scsi/bfa/bfa_ioc_ct.c
index 008d129ddfcd..93612520f0d2 100644
--- a/drivers/scsi/bfa/bfa_ioc_ct.c
+++ b/drivers/scsi/bfa/bfa_ioc_ct.c
@@ -41,6 +41,7 @@ static void bfa_ioc_ct_map_port(struct bfa_ioc_s *ioc);
 static void bfa_ioc_ct_isr_mode_set(struct bfa_ioc_s *ioc, bfa_boolean_t msix);
 static void bfa_ioc_ct_notify_fail(struct bfa_ioc_s *ioc);
 static void bfa_ioc_ct_ownership_reset(struct bfa_ioc_s *ioc);
+static bfa_boolean_t bfa_ioc_ct_sync_start(struct bfa_ioc_s *ioc);
 static void bfa_ioc_ct_sync_join(struct bfa_ioc_s *ioc);
 static void bfa_ioc_ct_sync_leave(struct bfa_ioc_s *ioc);
 static void bfa_ioc_ct_sync_ack(struct bfa_ioc_s *ioc);
@@ -62,6 +63,7 @@ bfa_ioc_set_ct_hwif(struct bfa_ioc_s *ioc)
         hwif_ct.ioc_isr_mode_set = bfa_ioc_ct_isr_mode_set;
         hwif_ct.ioc_notify_fail = bfa_ioc_ct_notify_fail;
         hwif_ct.ioc_ownership_reset = bfa_ioc_ct_ownership_reset;
+        hwif_ct.ioc_sync_start = bfa_ioc_ct_sync_start;
         hwif_ct.ioc_sync_join = bfa_ioc_ct_sync_join;
         hwif_ct.ioc_sync_leave = bfa_ioc_ct_sync_leave;
         hwif_ct.ioc_sync_ack = bfa_ioc_ct_sync_ack;
@@ -351,6 +353,30 @@ bfa_ioc_ct_ownership_reset(struct bfa_ioc_s *ioc)
         writel(1, ioc->ioc_regs.ioc_sem_reg);
 }
 
+static bfa_boolean_t
+bfa_ioc_ct_sync_start(struct bfa_ioc_s *ioc)
+{
+        uint32_t r32 = readl(ioc->ioc_regs.ioc_fail_sync);
+        uint32_t sync_reqd = bfa_ioc_ct_get_sync_reqd(r32);
+
+        /*
+         * Driver load time.  If the sync required bit for this PCI fn
+         * is set, it is due to an unclean exit by the driver for this
+         * PCI fn in the previous incarnation. Whoever comes here first
+         * should clean it up, no matter which PCI fn.
+         */
+
+        if (sync_reqd & bfa_ioc_ct_sync_pos(ioc)) {
+                writel(0, ioc->ioc_regs.ioc_fail_sync);
+                writel(1, ioc->ioc_regs.ioc_usage_reg);
+                writel(BFI_IOC_UNINIT, ioc->ioc_regs.ioc_fwstate);
+                writel(BFI_IOC_UNINIT, ioc->ioc_regs.alt_ioc_fwstate);
+                return BFA_TRUE;
+        }
+
+        return bfa_ioc_ct_sync_complete(ioc);
+}
+
 /*
  * Synchronized IOC failure processing routines
  */