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scsi: mpt3sas: Add Atomic RequestDescriptor support on Aero

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If the Aero HBA supports Atomic Request Descriptors, it sets the Atomic
Request Descriptor Capable bit in the IOCCapabilities field of the IOCFacts
Reply message. Driver uses an Atomic Request Descriptor as an alternative
method for posting an entry onto a request queue.

The posting of an Atomic Request Descriptor is an atomic operation,
providing a safe mechanism for multiple processors on the host to post
requests without synchronization. This Atomic Request Descriptor format is
identical to first 32 bits of Default Request Descriptor and uses only 32
bits.

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
2019-05-31 08:14:35 -04:00
committed by Martin K. Petersen
parent 078a4cc138
commit 79c74d03d5
2 changed files with 111 additions and 9 deletions
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2
drivers/scsi/mpt3sas/mpt3sas_base.h
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@@ -1147,6 +1147,7 @@ typedef void (*MPT3SAS_FLUSH_RUNNING_CMDS)(struct MPT3SAS_ADAPTER *ioc);
* path functions resulting in Null pointer reference followed by kernel
* crash. To avoid the above race condition we use mutex syncrhonization
* which ensures the syncrhonization between cli/sysfs_show path.
* @atomic_desc_capable: Atomic Request Descriptor support.
*/
struct MPT3SAS_ADAPTER {
struct list_head list;
@@ -1412,6 +1413,7 @@ struct MPT3SAS_ADAPTER {
u8 hide_drives;
spinlock_t diag_trigger_lock;
u8 diag_trigger_active;
u8 atomic_desc_capable;
BASE_READ_REG base_readl;
struct SL_WH_MASTER_TRIGGER_T diag_trigger_master;
struct SL_WH_EVENT_TRIGGERS_T diag_trigger_event;