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scsi: aacraid: Auto detect INTx or MSIx mode during sync cmd processing

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During sync command processing, if legacy INTx status indicates command
is not completed, sample the MSIx register and check if it indicates
command completion, set controller MSIx enabled flag.

Signed-off-by: Prasad B Munirathnam <prasad.munirathnam@microsemi.com>
Signed-off-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Reviewed-by: Dave Carroll <david.carroll@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Raghava Aditya Renukunta 2018-02-07 08:40:58 -08:00 committed by Martin K. Petersen
parent a5799d74d9
commit eee549e1e3
2 changed files with 17 additions and 6 deletions
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1
drivers/scsi/aacraid/aacraid.h
View File

@ -1231,6 +1231,7 @@ struct src_registers {
#define SRC_ODR_SHIFT 12
#define SRC_IDR_SHIFT 9
#define SRC_MSI_READ_MASK 0x1000
typedef void (*fib_callback)(void *ctxt, struct fib *fibctx);

22
drivers/scsi/aacraid/src.c
View File

@ -1405,13 +1405,23 @@ void aac_src_access_devreg(struct aac_dev *dev, int mode)
static int aac_src_get_sync_status(struct aac_dev *dev)
{
int msix_val = 0;
int legacy_val = 0;
int val;
msix_val = src_readl(dev, MUnit.ODR_MSI) & SRC_MSI_READ_MASK ? 1 : 0;
if (dev->msi_enabled)
val = src_readl(dev, MUnit.ODR_MSI) & 0x1000 ? 1 : 0;
else
val = src_readl(dev, MUnit.ODR_R) >> SRC_ODR_SHIFT;
if (!dev->msi_enabled) {
/*
* if Legacy int status indicates cmd is not complete
* sample MSIx register to see if it indiactes cmd complete,
* if yes set the controller in MSIx mode and consider cmd
* completed
*/
legacy_val = src_readl(dev, MUnit.ODR_R) >> SRC_ODR_SHIFT;
if (!(legacy_val & 1) && msix_val)
dev->msi_enabled = 1;
return legacy_val;
}
return val;
return msix_val;
}