ioat/dca: Update DCA BIOS workarounds to use TAINT_FIRMWARE_WORKAROUND

This patch is meant to be a follow-up for a patch originally submitted under
the title "ioat: Do not enable DCA if tag map is invalid". It was brought to
my attention that the preferred approach for BIOS workarounds is to set the
taint flag for TAINT_FIRMWARE_WORKAROUND for systems that require BIOS
workarounds.

This change makes it so that the DCA workarounds for broken BIOSes will now
use WARN_TAINT_ONCE(1, TAINT_FIRMWARE_WORKAROUND, ...) instead of just
printing a message via dev_err.

Signed-off-by: Alexander Duyck <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/dma/ioat/dca.c

···
 	}
 
 	if (!dca2_tag_map_valid(ioatdca->tag_map)) {
-		dev_err(&pdev->dev, "APICID_TAG_MAP set incorrectly by BIOS, "
-			"disabling DCA\n");
+		WARN_TAINT_ONCE(1, TAINT_FIRMWARE_WORKAROUND,
+				"%s %s: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n",
+				dev_driver_string(&pdev->dev),
+				dev_name(&pdev->dev));
 		free_dca_provider(dca);
 		return NULL;
 	}
···
 	}
 
 	if (dca3_tag_map_invalid(ioatdca->tag_map)) {
-		dev_err(&pdev->dev, "APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n");
+		WARN_TAINT_ONCE(1, TAINT_FIRMWARE_WORKAROUND,
+				"%s %s: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n",
+				dev_driver_string(&pdev->dev),
+				dev_name(&pdev->dev));
 		free_dca_provider(dca);
 		return NULL;
 	}