scsi: aacraid: Fix DMAR issues with iommu=pt

The driver changed the DMA consistent map after consistent memory was
allocated, this invalidated the IOMMU identity mapping. The fix was to
make sure that we set the DMA consistent mask setting once depending on
the controller card.
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>

drivers/scsi/aacraid/aachba.c

@@ -2071,20 +2071,15 @@ int aac_get_adapter_info(struct aac_dev* dev)
 		expose_physicals = 0;
 	}
 
-	if(dev->dac_support != 0) {
-		if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(64)) &&
-			!pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(64))) {
+	if (dev->dac_support) {
+		if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(64))) {
 			if (!dev->in_reset)
-				printk(KERN_INFO"%s%d: 64 Bit DAC enabled\n",
-					dev->name, dev->id);
-		} else if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(32)) &&
-			!pci_set_consistent_dma_mask(dev->pdev, DMA_BIT_MASK(32))) {
-			printk(KERN_INFO"%s%d: DMA mask set failed, 64 Bit DAC disabled\n",
-				dev->name, dev->id);
+				dev_info(&dev->pdev->dev, "64 Bit DAC enabled\n");
+		} else if (!pci_set_dma_mask(dev->pdev, DMA_BIT_MASK(32))) {
+			dev_info(&dev->pdev->dev, "DMA mask set failed, 64 Bit DAC disabled\n");
 			dev->dac_support = 0;
 		} else {
-			printk(KERN_WARNING"%s%d: No suitable DMA available.\n",
-				dev->name, dev->id);
+			dev_info(&dev->pdev->dev, "No suitable DMA available\n");
 			rcode = -ENOMEM;
 		}
 	}

drivers/scsi/aacraid/commsup.c

@@ -1513,6 +1513,7 @@ static int _aac_reset_adapter(struct aac_dev *aac, int forced, u8 reset_type)
 	struct scsi_cmnd *command_list;
 	int jafo = 0;
 	int bled;
+	u64 dmamask;
 
 	/*
 	 * Assumptions:
@@ -1580,21 +1581,27 @@ static int _aac_reset_adapter(struct aac_dev *aac, int forced, u8 reset_type)
 	aac_free_irq(aac);
 	kfree(aac->fsa_dev);
 	aac->fsa_dev = NULL;
+
+	dmamask = DMA_BIT_MASK(32);
 	quirks = aac_get_driver_ident(index)->quirks;
-	if (quirks & AAC_QUIRK_31BIT) {
-		if (((retval = pci_set_dma_mask(aac->pdev, DMA_BIT_MASK(31)))) ||
-		  ((retval = pci_set_consistent_dma_mask(aac->pdev, DMA_BIT_MASK(31)))))
-			goto out;
-	} else {
-		if (((retval = pci_set_dma_mask(aac->pdev, DMA_BIT_MASK(32)))) ||
-		  ((retval = pci_set_consistent_dma_mask(aac->pdev, DMA_BIT_MASK(32)))))
-			goto out;
+	if (quirks & AAC_QUIRK_31BIT)
+		retval = pci_set_dma_mask(aac->pdev, dmamask);
+	else if (!(quirks & AAC_QUIRK_SRC))
+		retval = pci_set_dma_mask(aac->pdev, dmamask);
+	else
+		retval = pci_set_consistent_dma_mask(aac->pdev, dmamask);
+
+	if (quirks & AAC_QUIRK_31BIT && !retval) {
+		dmamask = DMA_BIT_MASK(31);
+		retval = pci_set_consistent_dma_mask(aac->pdev, dmamask);
 	}
+
+	if (retval)
+		goto out;
+
 	if ((retval = (*(aac_get_driver_ident(index)->init))(aac)))
 		goto out;
-	if (quirks & AAC_QUIRK_31BIT)
-		if ((retval = pci_set_dma_mask(aac->pdev, DMA_BIT_MASK(32))))
-			goto out;
+
 	if (jafo) {
 		aac->thread = kthread_run(aac_command_thread, aac, "%s",
 					  aac->name);

drivers/scsi/aacraid/linit.c

@@ -1403,6 +1403,7 @@ static int aac_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 	int error = -ENODEV;
 	int unique_id = 0;
 	u64 dmamask;
+	int mask_bits = 0;
 	extern int aac_sync_mode;
 
 	/*
@@ -1426,18 +1427,32 @@ static int aac_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto out;
 	error = -ENODEV;
 
+	if (!(aac_drivers[index].quirks & AAC_QUIRK_SRC)) {
+		error = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+		if (error) {
+			dev_err(&pdev->dev, "PCI 32 BIT dma mask set failed");
+			goto out_disable_pdev;
+		}
+	}
+
 	/*
 	 * If the quirk31 bit is set, the adapter needs adapter
 	 * to driver communication memory to be allocated below 2gig
 	 */
-	if (aac_drivers[index].quirks & AAC_QUIRK_31BIT)
+	if (aac_drivers[index].quirks & AAC_QUIRK_31BIT) {
 		dmamask = DMA_BIT_MASK(31);
-	else
+		mask_bits = 31;
+	} else {
 		dmamask = DMA_BIT_MASK(32);
+		mask_bits = 32;
+	}
 
-	if (pci_set_dma_mask(pdev, dmamask) ||
-			pci_set_consistent_dma_mask(pdev, dmamask))
+	error = pci_set_consistent_dma_mask(pdev, dmamask);
+	if (error) {
+		dev_err(&pdev->dev, "PCI %d B consistent dma mask set failed\n"
+				, mask_bits);
 		goto out_disable_pdev;
+	}
 
 	pci_set_master(pdev);
 
@@ -1501,15 +1516,6 @@ static int aac_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto out_deinit;
 	}
 
-	/*
-	 * If we had set a smaller DMA mask earlier, set it to 4gig
-	 * now since the adapter can dma data to at least a 4gig
-	 * address space.
-	 */
-	if (aac_drivers[index].quirks & AAC_QUIRK_31BIT)
-		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)))
-			goto out_deinit;
-
 	aac->maximum_num_channels = aac_drivers[index].channels;
 	error = aac_get_adapter_info(aac);
 	if (error < 0)