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scsi: mpt3sas: Add separate function for aero doorbell reads

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Sometimes Aero controllers appears to be returning bad data (0) for
doorbell register read and if retries are performed immediately after the
bad read, they return good data.

Workaround is added to retry read from doorbell registers for maximum three
times if driver get the zero.  Added functions base_readl_aero for Aero IOC
and base_readl for gen35 and other controllers.

Signed-off-by: Suganath Prabu <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Suganath Prabu
2018-12-07 12:58:33 +05:30
committed by Martin K. Petersen
parent cc68e6077b
commit b899202901
2 changed files with 32 additions and 0 deletions
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drivers/scsi/mpt3sas/mpt3sas_base.h
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@@ -912,6 +912,7 @@ 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);
/* IOC Facts and Port Facts converted from little endian to cpu */
union mpi3_version_union {
@@ -1392,6 +1393,7 @@ struct MPT3SAS_ADAPTER {
u8 hide_drives;
spinlock_t diag_trigger_lock;
u8 diag_trigger_active;
BASE_READ_REG base_readl;
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;