From af6ec1eee5ed680df0b5e0e49aa6b2673ef6e237 Mon Sep 17 00:00:00 2001 From: Suganath Prabu S Date: Thu, 30 Jul 2020 13:33:44 +0530 Subject: [PATCH] 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 Signed-off-by: Martin K. Petersen --- drivers/scsi/mpt3sas/mpt3sas_base.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index 1d64524..712f7f1 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -5619,6 +5619,23 @@ _base_wait_on_iocstate(struct MPT3SAS_ADAPTER *ioc, u32 ioc_state, int timeout) } /** + * _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(®[i])); +} + +/** * _base_wait_for_doorbell_int - waiting for controller interrupt(generated by * a write to the doorbell) * @ioc: per adapter object @@ -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; } -- 2.7.4