linux-kernel - [RFC 7/7] iommufd: Skip the CACHE

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Message-Id: <20230923170540.1447301-8-lulu@redhat.com>
Date:   Sun, 24 Sep 2023 01:05:40 +0800
From:   Cindy Lu <lulu@...hat.com>
To:     lulu@...hat.com, jasowang@...hat.com, mst@...hat.com,
        yi.l.liu@...el.com, jgg@...dia.com, linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: [RFC 7/7] iommufd: Skip the CACHE_COHERENCY and iommu group check

This is just the work arround for vdpa, I Will
fix these problems in the next version.

Skip these 2 checks:
1.IOMMU_CAP_CACHE_COHERENCY check
2.iommu_group_get check

Signed-off-by: Cindy Lu <lulu@...hat.com>
---
 drivers/iommu/iommufd/device.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index f7cb353fd9c7..0224d751f503 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -71,8 +71,8 @@ struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx,
 	 * to restore cache coherency.
 	 */
 	if (!device_iommu_capable(dev, IOMMU_CAP_CACHE_COHERENCY))
-		return ERR_PTR(-EINVAL);
-
+		//return ERR_PTR(-EINVAL);
+#if 0
 	group = iommu_group_get(dev);
 	if (!group)
 		return ERR_PTR(-ENODEV);
@@ -80,7 +80,7 @@ struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx,
 	rc = iommu_device_claim_dma_owner(dev, ictx);
 	if (rc)
 		goto out_group_put;
-
+#endif
 	idev = iommufd_object_alloc(ictx, idev, IOMMUFD_OBJ_DEVICE);
 	if (IS_ERR(idev)) {
 		rc = PTR_ERR(idev);
-- 
2.34.3