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

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>

diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index c3fdec9d817a5241e701fd8c1b23b3065bddbb56..29bf1e60f5428ab4542cf0bd838342bd8d405f8b 100644 (file)
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -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);
 

diff --git a/drivers/scsi/aacraid/src.c b/drivers/scsi/aacraid/src.c
index 09b82d3325fc7d88b248e7f52b3c768580af6eb4..3122389f380f21738467f57652a0d9af88e03713 100644 (file)
--- a/drivers/scsi/aacraid/src.c
+++ b/drivers/scsi/aacraid/src.c
@@ -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;
 }