On Fri, Sep 22, 2023 at 10:55 AM Hector Martin marcan@marcan.st wrote:
Commit a4fdd9762272 ("iommu: Use flush queue capability") hid the IOMMU_DOMAIN_DMA_FQ domain type from domain allocation. A check was introduced in iommu_dma_init_domain() to fall back if not supported, but this check runs too late: by that point, devices have been attached to the IOMMU, and apple-dart's attach_dev() callback does not expect IOMMU_DOMAIN_DMA_FQ domains.
Change the logic so the IOMMU_DOMAIN_DMA codepath is the default, instead of explicitly enumerating all types.
Fixes an apple-dart regression in v6.5.
Cc: regressions@lists.linux.dev Cc: stable@vger.kernel.org Suggested-by: Robin Murphy robin.murphy@arm.com Fixes: a4fdd9762272 ("iommu: Use flush queue capability") Signed-off-by: Hector Martin marcan@marcan.st
Changes in v2:
- Fixed the issue in apple-dart instead of the iommu core, per Robin's suggestion.
- Link to v1: https://lore.kernel.org/r/20230922-iommu-type-regression-v1-1-1ed3825b2c38@m...
drivers/iommu/apple-dart.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index 2082081402d3..0b8927508427 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -671,8 +671,7 @@ static int apple_dart_attach_dev(struct iommu_domain *domain, return ret;
switch (domain->type) {
case IOMMU_DOMAIN_DMA:case IOMMU_DOMAIN_UNMANAGED:
default: ret = apple_dart_domain_add_streams(dart_domain, cfg); if (ret) return ret;
base-commit: ce9ecca0238b140b88f43859b211c9fdfd8e5b70 change-id: 20230922-iommu-type-regression-25b4f43df770
Best regards,
Hector Martin marcan@marcan.st
Looks good to me.
Reviewed-by: Neal Gompa neal@gompa.dev