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scsi: mpt3sas: Dump system registers for debugging 

When controller fails to transition to READY state during driver probe,
dump the system interface register set. This will give snapshot of the
firmware status for debugging driver load issues.

Link: https://lore.kernel.org/r/1596096229-3341-3-git-send-email-suganath-prabu.subramani@broadcom.com
Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Suganath Prabu S 2020-07-30 13:33:44 +05:30 committed by Martin K. Petersen
parent f09219e48b
commit af6ec1eee5
1 changed files with 20 additions and 0 deletions
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20
drivers/scsi/mpt3sas/mpt3sas_base.c
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@ -5618,6 +5618,23 @@ _base_wait_on_iocstate(struct MPT3SAS_ADAPTER *ioc, u32 ioc_state, int timeout)
return current_state;
}
/**
* _base_dump_reg_set - This function will print hexdump of register set.
* @ioc: per adapter object
*
* Returns nothing.
*/
static inline void
_base_dump_reg_set(struct MPT3SAS_ADAPTER *ioc)
{
unsigned int i, sz = 256;
u32 __iomem *reg = (u32 __iomem *)ioc->chip;
ioc_info(ioc, "System Register set:\n");
for (i = 0; i < (sz / sizeof(u32)); i++)
pr_info("%08x: %08x\n", (i * 4), readl(&reg[i]));
}
/**
* _base_wait_for_doorbell_int - waiting for controller interrupt(generated by
* a write to the doorbell)
@ -6797,6 +6814,7 @@ _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
if (count++ > 20) {
ioc_info(ioc,
"Stop writing magic sequence after 20 retries\n");
_base_dump_reg_set(ioc);
goto out;
}
@ -6825,6 +6843,7 @@ _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
if (host_diagnostic == 0xFFFFFFFF) {
ioc_info(ioc,
"Invalid host diagnostic register value\n");
_base_dump_reg_set(ioc);
goto out;
}
if (!(host_diagnostic & MPI2_DIAG_RESET_ADAPTER))
@ -6859,6 +6878,7 @@ _base_diag_reset(struct MPT3SAS_ADAPTER *ioc)
if (ioc_state) {
ioc_err(ioc, "%s: failed going to ready state (ioc_state=0x%x)\n",
__func__, ioc_state);
_base_dump_reg_set(ioc);
goto out;
}