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scsi: mpt3sas: Perform additional retries if doorbell read returns 0

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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: b899202901 ("scsi: mpt3sas: Add separate function for aero doorbell reads")
Cc: stable@vger.kernel.org
Signed-off-by: Ranjan Kumar <ranjan.kumar@broadcom.com>
Link: https://lore.kernel.org/r/20230829090020.5417-2-ranjan.kumar@broadcom.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ranjan Kumar 2023-08-29 14:30:19 +05:30 committed by Martin K. Petersen
parent be946e31bc
commit 4ca10f3e31
2 changed files with 34 additions and 13 deletions
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46
drivers/scsi/mpt3sas/mpt3sas_base.c
View File

@ -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;

1
drivers/scsi/mpt3sas/mpt3sas_base.h
View File

@ -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;