diff mbox series

[v1,1/2] Perform additional retries if Doorbell read returns 0

Message ID 20230713075302.10073-2-ranjan.kumar@broadcom.com
State Superseded
Headers show
Series mpt3sas: Additional retries when reading specific registers | expand

Commit Message

Ranjan Kumar July 13, 2023, 7:53 a.m. UTC 
Doorbell and Host diagnostic registers could return 0 even
after 3 retries and that leads to occasional resets of the
controllers, hence increased the retry count to thirty.

Fixes: b899202901a8 ("mpt3sas: Add separate function for aero doorbell reads")
Cc: stable@vger.kernel.org
Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
---
 drivers/scsi/mpt3sas/mpt3sas_base.c | 53 ++++++++++++++++-------------
 drivers/scsi/mpt3sas/mpt3sas_base.h | 11 +++++-
 2 files changed, 39 insertions(+), 25 deletions(-)
diff mbox series

Patch

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index 53f5492579cb..efc9bc48db6f 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -196,25 +196,27 @@  module_param_call(mpt3sas_fwfault_debug, _scsih_set_fwfault_debug,
 /**
  * _base_readl_aero - retry readl for max three times.
  * @addr: MPT Fusion system interface register address
- *
- * Retry the readl() for max three times if it gets zero value
+ *@retry_count: max no of retry
+
+ * Retry the readl() for max thirty times if it gets zero value
  * while reading the system interface register.
  */
+
 static inline u32
-_base_readl_aero(const volatile void __iomem *addr)
+_base_readl_aero(const volatile void __iomem *addr, u8 retry_count)
 {
 	u32 i = 0, ret_val;
 
 	do {
 		ret_val = readl(addr);
 		i++;
-	} while (ret_val == 0 && i < 3);
+	} while (ret_val == 0 && i < retry_count);
 
 	return ret_val;
 }
 
 static inline u32
-_base_readl(const volatile void __iomem *addr)
+_base_readl(const volatile void __iomem *addr, u8 retry_count)
 {
 	return readl(addr);
 }
@@ -940,7 +942,7 @@  mpt3sas_halt_firmware(struct MPT3SAS_ADAPTER *ioc)
 
 	dump_stack();
 
-	doorbell = ioc->base_readl(&ioc->chip->Doorbell);
+	doorbell = ioc->base_readl(&ioc->chip->Doorbell, READL_RETRY_COUNT);
 	if ((doorbell & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT) {
 		mpt3sas_print_fault_code(ioc, doorbell &
 		    MPI2_DOORBELL_DATA_MASK);
@@ -1617,10 +1619,10 @@  mpt3sas_base_mask_interrupts(struct MPT3SAS_ADAPTER *ioc)
 	u32 him_register;
 
 	ioc->mask_interrupts = 1;
-	him_register = ioc->base_readl(&ioc->chip->HostInterruptMask);
+	him_register = ioc->base_readl(&ioc->chip->HostInterruptMask, READL_RETRY_SHORT_COUNT);
 	him_register |= MPI2_HIM_DIM + MPI2_HIM_RIM + MPI2_HIM_RESET_IRQ_MASK;
 	writel(him_register, &ioc->chip->HostInterruptMask);
-	ioc->base_readl(&ioc->chip->HostInterruptMask);
+	ioc->base_readl(&ioc->chip->HostInterruptMask, READL_RETRY_SHORT_COUNT);
 }
 
 /**
@@ -1634,7 +1636,7 @@  mpt3sas_base_unmask_interrupts(struct MPT3SAS_ADAPTER *ioc)
 {
 	u32 him_register;
 
-	him_register = ioc->base_readl(&ioc->chip->HostInterruptMask);
+	him_register = ioc->base_readl(&ioc->chip->HostInterruptMask, READL_RETRY_SHORT_COUNT);
 	him_register &= ~MPI2_HIM_RIM;
 	writel(him_register, &ioc->chip->HostInterruptMask);
 	ioc->mask_interrupts = 0;
@@ -6686,7 +6688,7 @@  mpt3sas_base_get_iocstate(struct MPT3SAS_ADAPTER *ioc, int cooked)
 {
 	u32 s, sc;
 
-	s = ioc->base_readl(&ioc->chip->Doorbell);
+	s = ioc->base_readl(&ioc->chip->Doorbell, READL_RETRY_COUNT);
 	sc = s & MPI2_IOC_STATE_MASK;
 	return cooked ? sc : s;
 }
@@ -6760,7 +6762,8 @@  _base_wait_for_doorbell_int(struct MPT3SAS_ADAPTER *ioc, int timeout)
 	count = 0;
 	cntdn = 1000 * timeout;
 	do {
-		int_status = ioc->base_readl(&ioc->chip->HostInterruptStatus);
+		int_status = ioc->base_readl(&ioc->chip->HostInterruptStatus,
+						READL_RETRY_SHORT_COUNT);
 		if (int_status & MPI2_HIS_IOC2SYS_DB_STATUS) {
 			dhsprintk(ioc,
 				  ioc_info(ioc, "%s: successful count(%d), timeout(%d)\n",
@@ -6786,7 +6789,8 @@  _base_spin_on_doorbell_int(struct MPT3SAS_ADAPTER *ioc, int timeout)
 	count = 0;
 	cntdn = 2000 * timeout;
 	do {
-		int_status = ioc->base_readl(&ioc->chip->HostInterruptStatus);
+		int_status = ioc->base_readl(&ioc->chip->HostInterruptStatus,
+						READL_RETRY_SHORT_COUNT);
 		if (int_status & MPI2_HIS_IOC2SYS_DB_STATUS) {
 			dhsprintk(ioc,
 				  ioc_info(ioc, "%s: successful count(%d), timeout(%d)\n",
@@ -6824,14 +6828,15 @@  _base_wait_for_doorbell_ack(struct MPT3SAS_ADAPTER *ioc, int timeout)
 	count = 0;
 	cntdn = 1000 * timeout;
 	do {
-		int_status = ioc->base_readl(&ioc->chip->HostInterruptStatus);
+		int_status = ioc->base_readl(&ioc->chip->HostInterruptStatus,
+						READL_RETRY_SHORT_COUNT);
 		if (!(int_status & MPI2_HIS_SYS2IOC_DB_STATUS)) {
 			dhsprintk(ioc,
 				  ioc_info(ioc, "%s: successful count(%d), timeout(%d)\n",
 					   __func__, count, timeout));
 			return 0;
 		} else if (int_status & MPI2_HIS_IOC2SYS_DB_STATUS) {
-			doorbell = ioc->base_readl(&ioc->chip->Doorbell);
+			doorbell = ioc->base_readl(&ioc->chip->Doorbell, READL_RETRY_COUNT);
 			if ((doorbell & MPI2_IOC_STATE_MASK) ==
 			    MPI2_IOC_STATE_FAULT) {
 				mpt3sas_print_fault_code(ioc, doorbell);
@@ -6871,7 +6876,7 @@  _base_wait_for_doorbell_not_used(struct MPT3SAS_ADAPTER *ioc, int timeout)
 	count = 0;
 	cntdn = 1000 * timeout;
 	do {
-		doorbell_reg = ioc->base_readl(&ioc->chip->Doorbell);
+		doorbell_reg = ioc->base_readl(&ioc->chip->Doorbell, READL_RETRY_COUNT);
 		if (!(doorbell_reg & MPI2_DOORBELL_USED)) {
 			dhsprintk(ioc,
 				  ioc_info(ioc, "%s: successful count(%d), timeout(%d)\n",
@@ -7019,13 +7024,13 @@  _base_handshake_req_reply_wait(struct MPT3SAS_ADAPTER *ioc, int request_bytes,
 	__le32 *mfp;
 
 	/* make sure doorbell is not in use */
-	if ((ioc->base_readl(&ioc->chip->Doorbell) & MPI2_DOORBELL_USED)) {
+	if ((ioc->base_readl(&ioc->chip->Doorbell, READL_RETRY_COUNT) & MPI2_DOORBELL_USED)) {
 		ioc_err(ioc, "doorbell is in use (line=%d)\n", __LINE__);
 		return -EFAULT;
 	}
 
 	/* clear pending doorbell interrupts from previous state changes */
-	if (ioc->base_readl(&ioc->chip->HostInterruptStatus) &
+	if (ioc->base_readl(&ioc->chip->HostInterruptStatus, READL_RETRY_SHORT_COUNT) &
 	    MPI2_HIS_IOC2SYS_DB_STATUS)
 		writel(0, &ioc->chip->HostInterruptStatus);
 
@@ -7068,7 +7073,7 @@  _base_handshake_req_reply_wait(struct MPT3SAS_ADAPTER *ioc, int request_bytes,
 	}
 
 	/* read the first two 16-bits, it gives the total length of the reply */
-	reply[0] = le16_to_cpu(ioc->base_readl(&ioc->chip->Doorbell)
+	reply[0] = le16_to_cpu(ioc->base_readl(&ioc->chip->Doorbell, READL_RETRY_COUNT)
 	    & MPI2_DOORBELL_DATA_MASK);
 	writel(0, &ioc->chip->HostInterruptStatus);
 	if ((_base_wait_for_doorbell_int(ioc, 5))) {
@@ -7076,7 +7081,7 @@  _base_handshake_req_reply_wait(struct MPT3SAS_ADAPTER *ioc, int request_bytes,
 			__LINE__);
 		return -EFAULT;
 	}
-	reply[1] = le16_to_cpu(ioc->base_readl(&ioc->chip->Doorbell)
+	reply[1] = le16_to_cpu(ioc->base_readl(&ioc->chip->Doorbell, READL_RETRY_COUNT)
 	    & MPI2_DOORBELL_DATA_MASK);
 	writel(0, &ioc->chip->HostInterruptStatus);
 
@@ -7087,10 +7092,10 @@  _base_handshake_req_reply_wait(struct MPT3SAS_ADAPTER *ioc, int request_bytes,
 			return -EFAULT;
 		}
 		if (i >=  reply_bytes/2) /* overflow case */
-			ioc->base_readl(&ioc->chip->Doorbell);
+			ioc->base_readl(&ioc->chip->Doorbell, READL_RETRY_COUNT);
 		else
 			reply[i] = le16_to_cpu(
-			    ioc->base_readl(&ioc->chip->Doorbell)
+			    ioc->base_readl(&ioc->chip->Doorbell, READL_RETRY_COUNT)
 			    & MPI2_DOORBELL_DATA_MASK);
 		writel(0, &ioc->chip->HostInterruptStatus);
 	}
@@ -7949,14 +7954,14 @@  _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
 			goto out;
 		}
 
-		host_diagnostic = ioc->base_readl(&ioc->chip->HostDiagnostic);
+		host_diagnostic = ioc->base_readl(&ioc->chip->HostDiagnostic, READL_RETRY_COUNT);
 		drsprintk(ioc,
 			  ioc_info(ioc, "wrote magic sequence: count(%d), host_diagnostic(0x%08x)\n",
 				   count, host_diagnostic));
 
 	} while ((host_diagnostic & MPI2_DIAG_DIAG_WRITE_ENABLE) == 0);
 
-	hcb_size = ioc->base_readl(&ioc->chip->HCBSize);
+	hcb_size = ioc->base_readl(&ioc->chip->HCBSize, READL_RETRY_SHORT_COUNT);
 
 	drsprintk(ioc, ioc_info(ioc, "diag reset: issued\n"));
 	writel(host_diagnostic | MPI2_DIAG_RESET_ADAPTER,
@@ -7969,7 +7974,7 @@  _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
 	for (count = 0; count < (300000000 /
 		MPI2_HARD_RESET_PCIE_SECOND_READ_DELAY_MICRO_SEC); count++) {
 
-		host_diagnostic = ioc->base_readl(&ioc->chip->HostDiagnostic);
+		host_diagnostic = ioc->base_readl(&ioc->chip->HostDiagnostic, READL_RETRY_COUNT);
 
 		if (host_diagnostic == 0xFFFFFFFF) {
 			ioc_info(ioc,
diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.h b/drivers/scsi/mpt3sas/mpt3sas_base.h
index 05364aa15ecd..b4e57b89915d 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.h
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.h
@@ -160,6 +160,15 @@ 
 
 #define IOC_OPERATIONAL_WAIT_COUNT	10
 
+/*
+ *Due to hardware specific behaviour
+ *retry count is increased from 3 to 30.
+ *Delay is not needed as retry count fulfill
+ *the desired requirement
+ */
+#define READL_RETRY_COUNT              30
+#define READL_RETRY_SHORT_COUNT		3
+
 /*
  * NVMe defines
  */
@@ -994,7 +1003,7 @@  typedef void (*NVME_BUILD_PRP)(struct MPT3SAS_ADAPTER *ioc, u16 smid,
 typedef void (*PUT_SMID_IO_FP_HIP) (struct MPT3SAS_ADAPTER *ioc, u16 smid,
 	u16 funcdep);
 typedef void (*PUT_SMID_DEFAULT) (struct MPT3SAS_ADAPTER *ioc, u16 smid);
-typedef u32 (*BASE_READ_REG) (const volatile void __iomem *addr);
+typedef u32 (*BASE_READ_REG) (const volatile void __iomem *addr, u8 retry_count);
 /*
  * To get high iops reply queue's msix index when high iops mode is enabled
  * else get the msix index of general reply queues.