[SCSI] bfa: kdump fix on 815 and 825 adapters

Root cause: When kernel crashes, On brocade 815/825 adapters,
 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 fail
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: Vijaya Mohan Guvva <vmohan@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

5 files changed, 150 insertions, 24 deletions

diff --git a/drivers/scsi/bfa/bfa_ioc.c b/drivers/scsi/bfa/bfa_ioc.c
index 0116c1032e25..8928b68551c3 100644
--- a/drivers/scsi/bfa/bfa_ioc.c
+++ b/drivers/scsi/bfa/bfa_ioc.c
@@ -67,6 +67,14 @@ BFA_TRC_FILE(CNA, IOC);
 			((__ioc)->ioc_hwif->ioc_sync_ack(__ioc))
 #define bfa_ioc_sync_complete(__ioc)            \
 			((__ioc)->ioc_hwif->ioc_sync_complete(__ioc))
+#define bfa_ioc_set_cur_ioc_fwstate(__ioc, __fwstate)		\
+			((__ioc)->ioc_hwif->ioc_set_fwstate(__ioc, __fwstate))
+#define bfa_ioc_get_cur_ioc_fwstate(__ioc)		\
+			((__ioc)->ioc_hwif->ioc_get_fwstate(__ioc))
+#define bfa_ioc_set_alt_ioc_fwstate(__ioc, __fwstate)		\
+		((__ioc)->ioc_hwif->ioc_set_alt_fwstate(__ioc, __fwstate))
+#define bfa_ioc_get_alt_ioc_fwstate(__ioc)		\
+			((__ioc)->ioc_hwif->ioc_get_alt_fwstate(__ioc))
 
 #define bfa_ioc_mbox_cmd_pending(__ioc)		\
 			(!list_empty(&((__ioc)->mbox_mod.cmd_q)) || \
@@ -698,7 +706,7 @@ bfa_iocpf_sm_fwcheck_entry(struct bfa_iocpf_s *iocpf)
 	}
 
 	/* h/w sem init */
-	fwstate = readl(iocpf->ioc->ioc_regs.ioc_fwstate);
+	fwstate = bfa_ioc_get_cur_ioc_fwstate(iocpf->ioc);
 	if (fwstate == BFI_IOC_UNINIT) {
 		writel(1, iocpf->ioc->ioc_regs.ioc_init_sem_reg);
 		goto sem_get;
@@ -725,8 +733,8 @@ bfa_iocpf_sm_fwcheck_entry(struct bfa_iocpf_s *iocpf)
 
 	bfa_trc(iocpf->ioc, fwstate);
 	bfa_trc(iocpf->ioc, swab32(fwhdr.exec));
-	writel(BFI_IOC_UNINIT, iocpf->ioc->ioc_regs.ioc_fwstate);
-	writel(BFI_IOC_UNINIT, iocpf->ioc->ioc_regs.alt_ioc_fwstate);
+	bfa_ioc_set_cur_ioc_fwstate(iocpf->ioc, BFI_IOC_UNINIT);
+	bfa_ioc_set_alt_ioc_fwstate(iocpf->ioc, BFI_IOC_UNINIT);
 
 	/*
 	 * Unlock the hw semaphore. Should be here only once per boot.
@@ -1037,7 +1045,7 @@ bfa_iocpf_sm_disabling(struct bfa_iocpf_s *iocpf, enum iocpf_event event)
 		 */
 
 	case IOCPF_E_TIMEOUT:
-		writel(BFI_IOC_FAIL, ioc->ioc_regs.ioc_fwstate);
+		bfa_ioc_set_cur_ioc_fwstate(ioc, BFI_IOC_FAIL);
 		bfa_fsm_set_state(iocpf, bfa_iocpf_sm_disabling_sync);
 		break;
 
@@ -1138,7 +1146,7 @@ bfa_iocpf_sm_initfail_sync(struct bfa_iocpf_s *iocpf, enum iocpf_event event)
 	case IOCPF_E_SEMLOCKED:
 		bfa_ioc_notify_fail(ioc);
 		bfa_ioc_sync_leave(ioc);
-		writel(BFI_IOC_FAIL, ioc->ioc_regs.ioc_fwstate);
+		bfa_ioc_set_cur_ioc_fwstate(ioc, BFI_IOC_FAIL);
 		writel(1, ioc->ioc_regs.ioc_sem_reg);
 		bfa_fsm_set_state(iocpf, bfa_iocpf_sm_initfail);
 		break;
@@ -1227,7 +1235,7 @@ bfa_iocpf_sm_fail_sync(struct bfa_iocpf_s *iocpf, enum iocpf_event event)
 		bfa_ioc_notify_fail(ioc);
 		if (!iocpf->auto_recover) {
 			bfa_ioc_sync_leave(ioc);
-			writel(BFI_IOC_FAIL, ioc->ioc_regs.ioc_fwstate);
+			bfa_ioc_set_cur_ioc_fwstate(ioc, BFI_IOC_FAIL);
 			writel(1, ioc->ioc_regs.ioc_sem_reg);
 			bfa_fsm_set_state(iocpf, bfa_iocpf_sm_fail);
 		} else {
@@ -1519,7 +1527,7 @@ bfa_ioc_hwinit(struct bfa_ioc_s *ioc, bfa_boolean_t force)
 	u32 boot_type;
 	u32 boot_env;
 
-	ioc_fwstate = readl(ioc->ioc_regs.ioc_fwstate);
+	ioc_fwstate = bfa_ioc_get_cur_ioc_fwstate(ioc);
 
 	if (force)
 		ioc_fwstate = BFI_IOC_UNINIT;
@@ -2006,11 +2014,11 @@ bfa_ioc_boot(struct bfa_ioc_s *ioc, u32 boot_type, u32 boot_env)
 	 * Initialize IOC state of all functions on a chip reset.
 	 */
 	if (boot_type == BFI_FWBOOT_TYPE_MEMTEST) {
-		writel(BFI_IOC_MEMTEST, ioc->ioc_regs.ioc_fwstate);
-		writel(BFI_IOC_MEMTEST, ioc->ioc_regs.alt_ioc_fwstate);
+		bfa_ioc_set_cur_ioc_fwstate(ioc, BFI_IOC_MEMTEST);
+		bfa_ioc_set_alt_ioc_fwstate(ioc, BFI_IOC_MEMTEST);
 	} else {
-		writel(BFI_IOC_INITING, ioc->ioc_regs.ioc_fwstate);
-		writel(BFI_IOC_INITING, ioc->ioc_regs.alt_ioc_fwstate);
+		bfa_ioc_set_cur_ioc_fwstate(ioc, BFI_IOC_INITING);
+		bfa_ioc_set_alt_ioc_fwstate(ioc, BFI_IOC_INITING);
 	}
 
 	bfa_ioc_msgflush(ioc);
@@ -2038,7 +2046,7 @@ bfa_ioc_is_operational(struct bfa_ioc_s *ioc)
 bfa_boolean_t
 bfa_ioc_is_initialized(struct bfa_ioc_s *ioc)
 {
-	u32 r32 = readl(ioc->ioc_regs.ioc_fwstate);
+	u32 r32 = bfa_ioc_get_cur_ioc_fwstate(ioc);
 
 	return ((r32 != BFI_IOC_UNINIT) &&
 		(r32 != BFI_IOC_INITING) &&
@@ -2430,12 +2438,12 @@ bfa_ioc_adapter_is_disabled(struct bfa_ioc_s *ioc)
 	if (!bfa_fsm_cmp_state(ioc, bfa_ioc_sm_disabled))
 		return BFA_FALSE;
 
-	ioc_state = readl(ioc->ioc_regs.ioc_fwstate);
+	ioc_state = bfa_ioc_get_cur_ioc_fwstate(ioc);
 	if (!bfa_ioc_state_disabled(ioc_state))
 		return BFA_FALSE;
 
 	if (ioc->pcidev.device_id != BFA_PCI_DEVICE_ID_FC_8G1P) {
-		ioc_state = readl(ioc->ioc_regs.alt_ioc_fwstate);
+		ioc_state = bfa_ioc_get_cur_ioc_fwstate(ioc);
 		if (!bfa_ioc_state_disabled(ioc_state))
 			return BFA_FALSE;
 	}
@@ -2449,8 +2457,8 @@ bfa_ioc_adapter_is_disabled(struct bfa_ioc_s *ioc)
 void
 bfa_ioc_reset_fwstate(struct bfa_ioc_s *ioc)
 {
-	writel(BFI_IOC_UNINIT, ioc->ioc_regs.ioc_fwstate);
-	writel(BFI_IOC_UNINIT, ioc->ioc_regs.alt_ioc_fwstate);
+	bfa_ioc_set_cur_ioc_fwstate(ioc, BFI_IOC_UNINIT);
+	bfa_ioc_set_alt_ioc_fwstate(ioc, BFI_IOC_UNINIT);
 }
 
 #define BFA_MFG_NAME "Brocade"
@@ -2917,7 +2925,7 @@ bfa_iocpf_sem_timeout(void *ioc_arg)
 static void
 bfa_ioc_poll_fwinit(struct bfa_ioc_s *ioc)
 {
-	u32 fwstate = readl(ioc->ioc_regs.ioc_fwstate);
+	u32 fwstate = bfa_ioc_get_cur_ioc_fwstate(ioc);
 
 	bfa_trc(ioc, fwstate);
 
diff --git a/drivers/scsi/bfa/bfa_ioc.h b/drivers/scsi/bfa/bfa_ioc.h
index 23a90e7b7107..de62b68beb64 100644
--- a/drivers/scsi/bfa/bfa_ioc.h
+++ b/drivers/scsi/bfa/bfa_ioc.h
@@ -346,6 +346,12 @@ struct bfa_ioc_hwif_s {
 	void		(*ioc_sync_ack)		(struct bfa_ioc_s *ioc);
 	bfa_boolean_t	(*ioc_sync_complete)	(struct bfa_ioc_s *ioc);
 	bfa_boolean_t	(*ioc_lpu_read_stat)	(struct bfa_ioc_s *ioc);
+	void		(*ioc_set_fwstate)	(struct bfa_ioc_s *ioc,
+					enum bfi_ioc_state fwstate);
+	enum bfi_ioc_state	(*ioc_get_fwstate)	(struct bfa_ioc_s *ioc);
+	void		(*ioc_set_alt_fwstate)	(struct bfa_ioc_s *ioc,
+					enum bfi_ioc_state fwstate);
+	enum bfi_ioc_state	(*ioc_get_alt_fwstate)	(struct bfa_ioc_s *ioc);
 };
 
 /*
diff --git a/drivers/scsi/bfa/bfa_ioc_cb.c b/drivers/scsi/bfa/bfa_ioc_cb.c
index 30df8a284715..e3b928746674 100644
--- a/drivers/scsi/bfa/bfa_ioc_cb.c
+++ b/drivers/scsi/bfa/bfa_ioc_cb.c
@@ -22,6 +22,8 @@
 
 BFA_TRC_FILE(CNA, IOC_CB);
 
+#define bfa_ioc_cb_join_pos(__ioc) ((u32) (1 << BFA_IOC_CB_JOIN_SH))
+
 /*
  * forward declarations
  */
@@ -37,6 +39,12 @@ 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);
 static bfa_boolean_t bfa_ioc_cb_sync_complete(struct bfa_ioc_s *ioc);
+static void bfa_ioc_cb_set_cur_ioc_fwstate(
+			struct bfa_ioc_s *ioc, enum bfi_ioc_state fwstate);
+static enum bfi_ioc_state bfa_ioc_cb_get_cur_ioc_fwstate(struct bfa_ioc_s *ioc);
+static void bfa_ioc_cb_set_alt_ioc_fwstate(
+			struct bfa_ioc_s *ioc, enum bfi_ioc_state fwstate);
+static enum bfi_ioc_state bfa_ioc_cb_get_alt_ioc_fwstate(struct bfa_ioc_s *ioc);
 
 static struct bfa_ioc_hwif_s hwif_cb;
 
@@ -59,6 +67,10 @@ bfa_ioc_set_cb_hwif(struct bfa_ioc_s *ioc)
 	hwif_cb.ioc_sync_leave = bfa_ioc_cb_sync_leave;
 	hwif_cb.ioc_sync_ack = bfa_ioc_cb_sync_ack;
 	hwif_cb.ioc_sync_complete = bfa_ioc_cb_sync_complete;
+	hwif_cb.ioc_set_fwstate = bfa_ioc_cb_set_cur_ioc_fwstate;
+	hwif_cb.ioc_get_fwstate = bfa_ioc_cb_get_cur_ioc_fwstate;
+	hwif_cb.ioc_set_alt_fwstate = bfa_ioc_cb_set_alt_ioc_fwstate;
+	hwif_cb.ioc_get_alt_fwstate = bfa_ioc_cb_get_alt_ioc_fwstate;
 
 	ioc->ioc_hwif = &hwif_cb;
 }
@@ -187,6 +199,20 @@ bfa_ioc_cb_isr_mode_set(struct bfa_ioc_s *ioc, bfa_boolean_t msix)
 static bfa_boolean_t
 bfa_ioc_cb_sync_start(struct bfa_ioc_s *ioc)
 {
+	u32 ioc_fwstate = readl(ioc->ioc_regs.ioc_fwstate);
+
+	/**
+	 * Driver load time.  If the join bit 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 (ioc_fwstate & BFA_IOC_CB_JOIN_MASK) {
+		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_cb_sync_complete(ioc);
 }
 
@@ -212,24 +238,66 @@ bfa_ioc_cb_ownership_reset(struct bfa_ioc_s *ioc)
 static void
 bfa_ioc_cb_sync_join(struct bfa_ioc_s *ioc)
 {
+	u32 r32 = readl(ioc->ioc_regs.ioc_fwstate);
+	u32 join_pos = bfa_ioc_cb_join_pos(ioc);
+
+	writel((r32 | join_pos), ioc->ioc_regs.ioc_fwstate);
 }
 
 static void
 bfa_ioc_cb_sync_leave(struct bfa_ioc_s *ioc)
 {
+	u32 r32 = readl(ioc->ioc_regs.ioc_fwstate);
+	u32 join_pos = bfa_ioc_cb_join_pos(ioc);
+
+	writel((r32 & ~join_pos), ioc->ioc_regs.ioc_fwstate);
+}
+
+static void
+bfa_ioc_cb_set_cur_ioc_fwstate(struct bfa_ioc_s *ioc,
+			enum bfi_ioc_state fwstate)
+{
+	u32 r32 = readl(ioc->ioc_regs.ioc_fwstate);
+
+	writel((fwstate | (r32 & BFA_IOC_CB_JOIN_MASK)),
+				ioc->ioc_regs.ioc_fwstate);
+}
+
+static enum bfi_ioc_state
+bfa_ioc_cb_get_cur_ioc_fwstate(struct bfa_ioc_s *ioc)
+{
+	return (enum bfi_ioc_state)(readl(ioc->ioc_regs.ioc_fwstate) &
+			BFA_IOC_CB_FWSTATE_MASK);
+}
+
+static void
+bfa_ioc_cb_set_alt_ioc_fwstate(struct bfa_ioc_s *ioc,
+			enum bfi_ioc_state fwstate)
+{
+	u32 r32 = readl(ioc->ioc_regs.alt_ioc_fwstate);
+
+	writel((fwstate | (r32 & BFA_IOC_CB_JOIN_MASK)),
+				ioc->ioc_regs.alt_ioc_fwstate);
+}
+
+static enum bfi_ioc_state
+bfa_ioc_cb_get_alt_ioc_fwstate(struct bfa_ioc_s *ioc)
+{
+	return (enum bfi_ioc_state)(readl(ioc->ioc_regs.alt_ioc_fwstate) &
+			BFA_IOC_CB_FWSTATE_MASK);
 }
 
 static void
 bfa_ioc_cb_sync_ack(struct bfa_ioc_s *ioc)
 {
-	writel(BFI_IOC_FAIL, ioc->ioc_regs.ioc_fwstate);
+	bfa_ioc_cb_set_cur_ioc_fwstate(ioc, BFI_IOC_FAIL);
 }
 
 static bfa_boolean_t
 bfa_ioc_cb_sync_complete(struct bfa_ioc_s *ioc)
 {
-	uint32_t fwstate, alt_fwstate;
-	fwstate = readl(ioc->ioc_regs.ioc_fwstate);
+	u32 fwstate, alt_fwstate;
+	fwstate = bfa_ioc_cb_get_cur_ioc_fwstate(ioc);
 
 	/*
 	 * At this point, this IOC is hoding the hw sem in the
@@ -257,7 +325,7 @@ bfa_ioc_cb_sync_complete(struct bfa_ioc_s *ioc)
 		fwstate == BFI_IOC_OP)
 		return BFA_TRUE;
 	else {
-		alt_fwstate = readl(ioc->ioc_regs.alt_ioc_fwstate);
+		alt_fwstate = bfa_ioc_cb_get_alt_ioc_fwstate(ioc);
 		if (alt_fwstate == BFI_IOC_FAIL ||
 			alt_fwstate == BFI_IOC_DISABLED ||
 			alt_fwstate == BFI_IOC_UNINIT ||
@@ -272,7 +340,7 @@ bfa_ioc_cb_sync_complete(struct bfa_ioc_s *ioc)
 bfa_status_t
 bfa_ioc_cb_pll_init(void __iomem *rb, enum bfi_asic_mode fcmode)
 {
-	u32	pll_sclk, pll_fclk;
+	u32	pll_sclk, pll_fclk, join_bits;
 
 	pll_sclk = __APP_PLL_SCLK_ENABLE | __APP_PLL_SCLK_LRESETN |
 		__APP_PLL_SCLK_P0_1(3U) |
@@ -282,8 +350,12 @@ bfa_ioc_cb_pll_init(void __iomem *rb, enum bfi_asic_mode fcmode)
 		__APP_PLL_LCLK_RSEL200500 | __APP_PLL_LCLK_P0_1(3U) |
 		__APP_PLL_LCLK_JITLMT0_1(3U) |
 		__APP_PLL_LCLK_CNTLMT0_1(3U);
-	writel(BFI_IOC_UNINIT, (rb + BFA_IOC0_STATE_REG));
-	writel(BFI_IOC_UNINIT, (rb + BFA_IOC1_STATE_REG));
+	join_bits = readl(rb + BFA_IOC0_STATE_REG) &
+			BFA_IOC_CB_JOIN_MASK;
+	writel((BFI_IOC_UNINIT | join_bits), (rb + BFA_IOC0_STATE_REG));
+	join_bits = readl(rb + BFA_IOC1_STATE_REG) &
+			BFA_IOC_CB_JOIN_MASK;
+	writel((BFI_IOC_UNINIT | join_bits), (rb + BFA_IOC1_STATE_REG));
 	writel(0xffffffffU, (rb + HOSTFN0_INT_MSK));
 	writel(0xffffffffU, (rb + HOSTFN1_INT_MSK));
 	writel(0xffffffffU, (rb + HOSTFN0_INT_STATUS));
diff --git a/drivers/scsi/bfa/bfa_ioc_ct.c b/drivers/scsi/bfa/bfa_ioc_ct.c
index a8e52a108710..bd53150e4ee0 100644
--- a/drivers/scsi/bfa/bfa_ioc_ct.c
+++ b/drivers/scsi/bfa/bfa_ioc_ct.c
@@ -43,6 +43,12 @@ 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);
 static bfa_boolean_t bfa_ioc_ct_sync_complete(struct bfa_ioc_s *ioc);
+static void bfa_ioc_ct_set_cur_ioc_fwstate(
+			struct bfa_ioc_s *ioc, enum bfi_ioc_state fwstate);
+static enum bfi_ioc_state bfa_ioc_ct_get_cur_ioc_fwstate(struct bfa_ioc_s *ioc);
+static void bfa_ioc_ct_set_alt_ioc_fwstate(
+			struct bfa_ioc_s *ioc, enum bfi_ioc_state fwstate);
+static enum bfi_ioc_state bfa_ioc_ct_get_alt_ioc_fwstate(struct bfa_ioc_s *ioc);
 
 static struct bfa_ioc_hwif_s hwif_ct;
 static struct bfa_ioc_hwif_s hwif_ct2;
@@ -512,6 +518,10 @@ bfa_ioc_set_ctx_hwif(struct bfa_ioc_s *ioc, struct bfa_ioc_hwif_s *hwif)
 	hwif->ioc_sync_leave = bfa_ioc_ct_sync_leave;
 	hwif->ioc_sync_ack = bfa_ioc_ct_sync_ack;
 	hwif->ioc_sync_complete = bfa_ioc_ct_sync_complete;
+	hwif->ioc_set_fwstate = bfa_ioc_ct_set_cur_ioc_fwstate;
+	hwif->ioc_get_fwstate = bfa_ioc_ct_get_cur_ioc_fwstate;
+	hwif->ioc_set_alt_fwstate = bfa_ioc_ct_set_alt_ioc_fwstate;
+	hwif->ioc_get_alt_fwstate = bfa_ioc_ct_get_alt_ioc_fwstate;
 }
 
 /**
@@ -959,3 +969,29 @@ bfa_ioc_ct2_pll_init(void __iomem *rb, enum bfi_asic_mode mode)
 
 	return BFA_STATUS_OK;
 }
+
+static void
+bfa_ioc_ct_set_cur_ioc_fwstate(struct bfa_ioc_s *ioc,
+		enum bfi_ioc_state fwstate)
+{
+	writel(fwstate, ioc->ioc_regs.ioc_fwstate);
+}
+
+static enum bfi_ioc_state
+bfa_ioc_ct_get_cur_ioc_fwstate(struct bfa_ioc_s *ioc)
+{
+	return (enum bfi_ioc_state)readl(ioc->ioc_regs.ioc_fwstate);
+}
+
+static void
+bfa_ioc_ct_set_alt_ioc_fwstate(struct bfa_ioc_s *ioc,
+		enum bfi_ioc_state fwstate)
+{
+	writel(fwstate, ioc->ioc_regs.alt_ioc_fwstate);
+}
+
+static enum bfi_ioc_state
+bfa_ioc_ct_get_alt_ioc_fwstate(struct bfa_ioc_s *ioc)
+{
+	return (enum bfi_ioc_state) readl(ioc->ioc_regs.alt_ioc_fwstate);
+}
diff --git a/drivers/scsi/bfa/bfi.h b/drivers/scsi/bfa/bfi.h
index e70e0832eafd..bf0a58d03be8 100644
--- a/drivers/scsi/bfa/bfi.h
+++ b/drivers/scsi/bfa/bfi.h
@@ -374,6 +374,10 @@ enum bfi_ioc_state {
 	BFI_IOC_MEMTEST		= 9,	/*  IOC is doing memtest	     */
 };
 
+#define BFA_IOC_CB_JOIN_SH	16
+#define BFA_IOC_CB_FWSTATE_MASK	0x0000ffff
+#define BFA_IOC_CB_JOIN_MASK	0xffff0000
+
 #define BFI_IOC_ENDIAN_SIG  0x12345678
 
 enum {