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FAILED: patch "[PATCH] scsi: mpt3sas: Perform additional retries if doorbell read" failed to apply to 5.4-stable tree

PATCH [email protected] 1 participant 1 message Sep 9, 2023

Subsystems (3)
Stable branch SCSI LSI Logic MPT fusion drivers (FC/SAS/SPI)
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The patch below does not apply to the 5.4-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y
git checkout FETCH_HEAD
git cherry-pick -x 4ca10f3e31745d35249a727ecd108eb58f0a8c5e
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2023090901-refinance-partake-fb8a@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 4ca10f3e31745d35249a727ecd108eb58f0a8c5e Mon Sep 17 00:00:00 2001
From: Ranjan Kumar <[email protected]>
Date: Tue, 29 Aug 2023 14:30:19 +0530
Subject: [PATCH] scsi: mpt3sas: Perform additional retries if doorbell read
returns 0

The driver retries certain register reads 3 times if the returned value is
0. This was done because the controller could return 0 for certain registers if other registers were being accessed concurrently by the BMC.

In certain systems with increased BMC interactions, the register values returned can be 0 for longer than 3 retries. Change the retry count from 3 to 30 for the affected registers to prevent problems with out-of-band management.

Fixes b899202901a8 ("scsi: mpt3sas: Add separate function for aero doorbell reads")
Cc [email protected]
Signed-off-by Ranjan Kumar <[email protected]>
Link https://lore.kernel.org/r/[email protected] open here
Signed-off-by Martin K. Petersen <[email protected]>
drivers/scsi/mpt3sas/mpt3sas_base.c +33 -13
index 53f5492579cb..5284584e4cd2 100644
@@ -138,6 +138,9 @@ _base_get_ioc_facts(struct MPT3SAS_ADAPTER *ioc);
 static void
 _base_clear_outstanding_commands(struct MPT3SAS_ADAPTER *ioc);
 
+static u32
+_base_readl_ext_retry(const volatile void __iomem *addr);
+
 /**
  * mpt3sas_base_check_cmd_timeout - Function
  *		to check timeout and command termination due

@@ -213,6 +216,20 @@ _base_readl_aero(const volatile void __iomem *addr)
 	return ret_val;
 }
 
+static u32
+_base_readl_ext_retry(const volatile void __iomem *addr)
+{
+	u32 i, ret_val;
+
+	for (i = 0 ; i < 30 ; i++) {
+		ret_val = readl(addr);
+		if (ret_val == 0)
+			continue;
+	}
+
+	return ret_val;
+}
+
 static inline u32
 _base_readl(const volatile void __iomem *addr)
 {

@@ -940,7 +957,7 @@ mpt3sas_halt_firmware(struct MPT3SAS_ADAPTER *ioc)
 
 	dump_stack();
 
-	doorbell = ioc->base_readl(&ioc->chip->Doorbell);
+	doorbell = ioc->base_readl_ext_retry(&ioc->chip->Doorbell);
 	if ((doorbell & MPI2_IOC_STATE_MASK) == MPI2_IOC_STATE_FAULT) {
 		mpt3sas_print_fault_code(ioc, doorbell &
 		    MPI2_DOORBELL_DATA_MASK);

@@ -6686,7 +6703,7 @@ mpt3sas_base_get_iocstate(struct MPT3SAS_ADAPTER *ioc, int cooked)
 {
 	u32 s, sc;
 
-	s = ioc->base_readl(&ioc->chip->Doorbell);
+	s = ioc->base_readl_ext_retry(&ioc->chip->Doorbell);
 	sc = s & MPI2_IOC_STATE_MASK;
 	return cooked ? sc : s;
 }

@@ -6831,7 +6848,7 @@ _base_wait_for_doorbell_ack(struct MPT3SAS_ADAPTER *ioc, int timeout)
 					   __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_ext_retry(&ioc->chip->Doorbell);
 			if ((doorbell & MPI2_IOC_STATE_MASK) ==
 			    MPI2_IOC_STATE_FAULT) {
 				mpt3sas_print_fault_code(ioc, doorbell);

@@ -6871,7 +6888,7 @@ _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_ext_retry(&ioc->chip->Doorbell);
 		if (!(doorbell_reg & MPI2_DOORBELL_USED)) {
 			dhsprintk(ioc,
 				  ioc_info(ioc, "%s: successful count(%d), timeout(%d)\n",

@@ -7019,7 +7036,7 @@ _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_ext_retry(&ioc->chip->Doorbell) & MPI2_DOORBELL_USED)) {
 		ioc_err(ioc, "doorbell is in use (line=%d)\n", __LINE__);
 		return -EFAULT;
 	}

@@ -7068,7 +7085,7 @@ _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_ext_retry(&ioc->chip->Doorbell)
 	    & MPI2_DOORBELL_DATA_MASK);
 	writel(0, &ioc->chip->HostInterruptStatus);
 	if ((_base_wait_for_doorbell_int(ioc, 5))) {

@@ -7076,7 +7093,7 @@ _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_ext_retry(&ioc->chip->Doorbell)
 	    & MPI2_DOORBELL_DATA_MASK);
 	writel(0, &ioc->chip->HostInterruptStatus);
 

@@ -7087,10 +7104,10 @@ _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_ext_retry(&ioc->chip->Doorbell);
 		else
 			reply[i] = le16_to_cpu(
-			    ioc->base_readl(&ioc->chip->Doorbell)
+			    ioc->base_readl_ext_retry(&ioc->chip->Doorbell)
 			    & MPI2_DOORBELL_DATA_MASK);
 		writel(0, &ioc->chip->HostInterruptStatus);
 	}

@@ -7949,7 +7966,7 @@ _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
 			goto out;
 		}
 
-		host_diagnostic = ioc->base_readl(&ioc->chip->HostDiagnostic);
+		host_diagnostic = ioc->base_readl_ext_retry(&ioc->chip->HostDiagnostic);
 		drsprintk(ioc,
 			  ioc_info(ioc, "wrote magic sequence: count(%d), host_diagnostic(0x%08x)\n",
 				   count, host_diagnostic));

@@ -7969,7 +7986,7 @@ _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_ext_retry(&ioc->chip->HostDiagnostic);
 
 		if (host_diagnostic == 0xFFFFFFFF) {
 			ioc_info(ioc,

@@ -8359,10 +8376,13 @@ mpt3sas_base_attach(struct MPT3SAS_ADAPTER *ioc)
 	ioc->rdpq_array_enable_assigned = 0;
 	ioc->use_32bit_dma = false;
 	ioc->dma_mask = 64;
-	if (ioc->is_aero_ioc)
+	if (ioc->is_aero_ioc) {
 		ioc->base_readl = &_base_readl_aero;
-	else
+		ioc->base_readl_ext_retry = &_base_readl_ext_retry;
+	} else {
 		ioc->base_readl = &_base_readl;
+		ioc->base_readl_ext_retry = &_base_readl;
+	}
 	r = mpt3sas_base_map_resources(ioc);
 	if (r)
 		goto out_free_resources;
drivers/scsi/mpt3sas/mpt3sas_base.h +1 -0
index 05364aa15ecd..10055c7e4a9f 100644
@@ -1618,6 +1618,7 @@ struct MPT3SAS_ADAPTER {
 	u8		diag_trigger_active;
 	u8		atomic_desc_capable;
 	BASE_READ_REG	base_readl;
+	BASE_READ_REG	base_readl_ext_retry;
 	struct SL_WH_MASTER_TRIGGER_T diag_trigger_master;
 	struct SL_WH_EVENT_TRIGGERS_T diag_trigger_event;
 	struct SL_WH_SCSI_TRIGGERS_T diag_trigger_scsi;