[PATCH 3/3] iommu: Convert response code from failure to invalid

[Lu Baolu]

In the iopf deliver path, iommu_report_device_fault() currently responds
a code of "Response Failure" to the hardware if it can't find a suitable
iopf-capable domain where the page faults should be handled. The Response
Failure is defined in PCI spec (section 10.4.2.1) as a catastrophic error,
and the device will disable PRI for the function.

Failing to dispatch a set of fault messages is not a catastrophic error
and the iommu core has no code to recover the PRI once it is disabled.

Replace it with a response code of "Invalid Response".

Fixes: b554e396e51c ("iommu: Make iopf_group_response() return void")
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
---
 drivers/iommu/io-pgfault.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/io-pgfault.c b/drivers/iommu/io-pgfault.c
index cd679c13752e..b8270ee5dcdb 100644
--- a/drivers/iommu/io-pgfault.c
+++ b/drivers/iommu/io-pgfault.c
@@ -229,7 +229,7 @@ void iommu_report_device_fault(struct device *dev, struct iopf_fault *evt)
 err_abort:
 	dev_warn_ratelimited(dev, "iopf with pasid %d aborted\n",
 			     fault->prm.pasid);
-	iopf_group_response(group, IOMMU_PAGE_RESP_FAILURE);
+	iopf_group_response(group, IOMMU_PAGE_RESP_INVALID);
 	if (group == &abort_group)
 		__iopf_free_group(group);
 	else
-- 
2.34.1