[PATCH 2/5] iommu: Ensure device has the same iommu_ops as the domain

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The core code should not call an iommu driver op with a struct device
parameter unless it knows that the dev_iommu_priv_get() for that struct
device was setup by the same driver. Otherwise in a mixed driver system
the iommu_priv could be casted to the wrong type.

Store the iommu_ops pointer in the iommu_domain and use it as a check to
validate that the struct device is correct before invoking any domain op
that accepts a struct device.

This allows removing the check of the domain op equality in VFIO.

Co-developed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
---
 drivers/iommu/amd/iommu.c                   | 1 +
 drivers/iommu/apple-dart.c                  | 1 +
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 1 +
 drivers/iommu/arm/arm-smmu/arm-smmu.c       | 1 +
 drivers/iommu/arm/arm-smmu/qcom_iommu.c     | 1 +
 drivers/iommu/exynos-iommu.c                | 1 +
 drivers/iommu/fsl_pamu_domain.c             | 1 +
 drivers/iommu/intel/iommu.c                 | 1 +
 drivers/iommu/iommu.c                       | 4 ++++
 drivers/iommu/ipmmu-vmsa.c                  | 1 +
 drivers/iommu/msm_iommu.c                   | 1 +
 drivers/iommu/mtk_iommu.c                   | 1 +
 drivers/iommu/mtk_iommu_v1.c                | 1 +
 drivers/iommu/omap-iommu.c                  | 1 +
 drivers/iommu/rockchip-iommu.c              | 1 +
 drivers/iommu/s390-iommu.c                  | 1 +
 drivers/iommu/sprd-iommu.c                  | 1 +
 drivers/iommu/sun50i-iommu.c                | 1 +
 drivers/iommu/tegra-gart.c                  | 1 +
 drivers/iommu/tegra-smmu.c                  | 1 +
 drivers/iommu/virtio-iommu.c                | 1 +
 include/linux/iommu.h                       | 2 ++
 22 files changed, 26 insertions(+)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index ad499658a6b6..679f7a265013 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2285,6 +2285,7 @@ const struct iommu_ops amd_iommu_ops = {
 	.pgsize_bitmap	= AMD_IOMMU_PGSIZES,
 	.def_domain_type = amd_iommu_def_domain_type,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &amd_iommu_ops,
 		.attach_dev	= amd_iommu_attach_device,
 		.detach_dev	= amd_iommu_detach_device,
 		.map		= amd_iommu_map,
diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index e58dc310afd7..3d36d9a12aa7 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c
@@ -775,6 +775,7 @@ static const struct iommu_ops apple_dart_iommu_ops = {
 	.pgsize_bitmap = -1UL, /* Restricted during dart probe */
 	.owner = THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &apple_dart_iommu_ops,
 		.attach_dev	= apple_dart_attach_dev,
 		.detach_dev	= apple_dart_detach_dev,
 		.map_pages	= apple_dart_map_pages,
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 6c393cd84925..471ceb60427c 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2859,6 +2859,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.pgsize_bitmap		= -1UL, /* Restricted during device attach */
 	.owner			= THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops		= &arm_smmu_ops,
 		.attach_dev		= arm_smmu_attach_dev,
 		.map_pages		= arm_smmu_map_pages,
 		.unmap_pages		= arm_smmu_unmap_pages,
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 2ed3594f384e..52c2589a4deb 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1597,6 +1597,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.pgsize_bitmap		= -1UL, /* Restricted during device attach */
 	.owner			= THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops		= &arm_smmu_ops,
 		.attach_dev		= arm_smmu_attach_dev,
 		.map_pages		= arm_smmu_map_pages,
 		.unmap_pages		= arm_smmu_unmap_pages,
diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
index a8b63b855ffb..8806a621f81e 100644
--- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c
+++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
@@ -596,6 +596,7 @@ static const struct iommu_ops qcom_iommu_ops = {
 	.of_xlate	= qcom_iommu_of_xlate,
 	.pgsize_bitmap	= SZ_4K | SZ_64K | SZ_1M | SZ_16M,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &qcom_iommu_ops,
 		.attach_dev	= qcom_iommu_attach_dev,
 		.detach_dev	= qcom_iommu_detach_dev,
 		.map		= qcom_iommu_map,
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 71f2018e23fe..fa93f94313e3 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -1315,6 +1315,7 @@ static const struct iommu_ops exynos_iommu_ops = {
 	.pgsize_bitmap = SECT_SIZE | LPAGE_SIZE | SPAGE_SIZE,
 	.of_xlate = exynos_iommu_of_xlate,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &exynos_iommu_ops,
 		.attach_dev	= exynos_iommu_attach_device,
 		.detach_dev	= exynos_iommu_detach_device,
 		.map		= exynos_iommu_map,
diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 94b4589dc67c..7bdce4168d2c 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -458,6 +458,7 @@ static const struct iommu_ops fsl_pamu_ops = {
 	.release_device	= fsl_pamu_release_device,
 	.device_group   = fsl_pamu_device_group,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &fsl_pamu_ops,
 		.attach_dev	= fsl_pamu_attach_device,
 		.detach_dev	= fsl_pamu_detach_device,
 		.iova_to_phys	= fsl_pamu_iova_to_phys,
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 0813b119d680..c6022484ca2d 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4925,6 +4925,7 @@ const struct iommu_ops intel_iommu_ops = {
 	.page_response		= intel_svm_page_response,
 #endif
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops		= &intel_iommu_ops,
 		.attach_dev		= intel_iommu_attach_device,
 		.detach_dev		= intel_iommu_detach_device,
 		.map_pages		= intel_iommu_map_pages,
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 19cf28d40ebe..8a1f437a51f2 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1963,6 +1963,10 @@ static int __iommu_attach_device(struct iommu_domain *domain,
 {
 	int ret;
 
+	/* Ensure the device was probe'd onto the same driver as the domain */
+	if (dev->bus->iommu_ops != domain->ops->iommu_ops)
+		return -EMEDIUMTYPE;
+
 	if (unlikely(domain->ops->attach_dev == NULL))
 		return -ENODEV;
 
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index e491e410add5..767b93da5800 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -877,6 +877,7 @@ static const struct iommu_ops ipmmu_ops = {
 	.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
 	.of_xlate = ipmmu_of_xlate,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &ipmmu_ops,
 		.attach_dev	= ipmmu_attach_device,
 		.detach_dev	= ipmmu_detach_device,
 		.map		= ipmmu_map,
diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
index f09aedfdd462..29f6a6d5691e 100644
--- a/drivers/iommu/msm_iommu.c
+++ b/drivers/iommu/msm_iommu.c
@@ -682,6 +682,7 @@ static struct iommu_ops msm_iommu_ops = {
 	.pgsize_bitmap = MSM_IOMMU_PGSIZES,
 	.of_xlate = qcom_iommu_of_xlate,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &msm_iommu_ops,
 		.attach_dev	= msm_iommu_attach_dev,
 		.detach_dev	= msm_iommu_detach_dev,
 		.map		= msm_iommu_map,
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index bb9dd92c9898..c5c45f65077d 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -937,6 +937,7 @@ static const struct iommu_ops mtk_iommu_ops = {
 	.pgsize_bitmap	= SZ_4K | SZ_64K | SZ_1M | SZ_16M,
 	.owner		= THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &mtk_iommu_ops,
 		.attach_dev	= mtk_iommu_attach_device,
 		.detach_dev	= mtk_iommu_detach_device,
 		.map		= mtk_iommu_map,
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index e1cb51b9866c..77c53580f730 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -594,6 +594,7 @@ static const struct iommu_ops mtk_iommu_v1_ops = {
 	.pgsize_bitmap	= ~0UL << MT2701_IOMMU_PAGE_SHIFT,
 	.owner          = THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &mtk_iommu_v1_ops,
 		.attach_dev	= mtk_iommu_v1_attach_device,
 		.detach_dev	= mtk_iommu_v1_detach_device,
 		.map		= mtk_iommu_v1_map,
diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
index bbc6c4cd7aae..a0bf85ccebcd 100644
--- a/drivers/iommu/omap-iommu.c
+++ b/drivers/iommu/omap-iommu.c
@@ -1739,6 +1739,7 @@ static const struct iommu_ops omap_iommu_ops = {
 	.device_group	= omap_iommu_device_group,
 	.pgsize_bitmap	= OMAP_IOMMU_PGSIZES,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &omap_iommu_ops,
 		.attach_dev	= omap_iommu_attach_dev,
 		.detach_dev	= omap_iommu_detach_dev,
 		.map		= omap_iommu_map,
diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index ab57c4b8fade..5f5387e902e0 100644
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -1193,6 +1193,7 @@ static const struct iommu_ops rk_iommu_ops = {
 	.pgsize_bitmap = RK_IOMMU_PGSIZE_BITMAP,
 	.of_xlate = rk_iommu_of_xlate,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &rk_iommu_ops,
 		.attach_dev	= rk_iommu_attach_device,
 		.detach_dev	= rk_iommu_detach_device,
 		.map		= rk_iommu_map,
diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c
index c898bcbbce11..62e6d152b0a0 100644
--- a/drivers/iommu/s390-iommu.c
+++ b/drivers/iommu/s390-iommu.c
@@ -377,6 +377,7 @@ static const struct iommu_ops s390_iommu_ops = {
 	.device_group = generic_device_group,
 	.pgsize_bitmap = S390_IOMMU_PGSIZES,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &s390_iommu_ops,
 		.attach_dev	= s390_iommu_attach_device,
 		.detach_dev	= s390_iommu_detach_device,
 		.map		= s390_iommu_map,
diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
index bd409bab6286..6e8ca34d6a00 100644
--- a/drivers/iommu/sprd-iommu.c
+++ b/drivers/iommu/sprd-iommu.c
@@ -423,6 +423,7 @@ static const struct iommu_ops sprd_iommu_ops = {
 	.pgsize_bitmap	= ~0UL << SPRD_IOMMU_PAGE_SHIFT,
 	.owner		= THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &sprd_iommu_ops,
 		.attach_dev	= sprd_iommu_attach_device,
 		.detach_dev	= sprd_iommu_detach_device,
 		.map		= sprd_iommu_map,
diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c
index c54ab477b8fd..560cff8e0f04 100644
--- a/drivers/iommu/sun50i-iommu.c
+++ b/drivers/iommu/sun50i-iommu.c
@@ -766,6 +766,7 @@ static const struct iommu_ops sun50i_iommu_ops = {
 	.probe_device	= sun50i_iommu_probe_device,
 	.release_device	= sun50i_iommu_release_device,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &sun50i_iommu_ops,
 		.attach_dev	= sun50i_iommu_attach_device,
 		.detach_dev	= sun50i_iommu_detach_device,
 		.flush_iotlb_all = sun50i_iommu_flush_iotlb_all,
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index a6700a40a6f8..cd4553611cc9 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -278,6 +278,7 @@ static const struct iommu_ops gart_iommu_ops = {
 	.pgsize_bitmap	= GART_IOMMU_PGSIZES,
 	.of_xlate	= gart_iommu_of_xlate,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &gart_iommu_ops,
 		.attach_dev	= gart_iommu_attach_dev,
 		.detach_dev	= gart_iommu_detach_dev,
 		.map		= gart_iommu_map,
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 2f2b12033618..67c101d1ad66 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -971,6 +971,7 @@ static const struct iommu_ops tegra_smmu_ops = {
 	.of_xlate = tegra_smmu_of_xlate,
 	.pgsize_bitmap = SZ_4K,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops	= &tegra_smmu_ops,
 		.attach_dev	= tegra_smmu_attach_dev,
 		.detach_dev	= tegra_smmu_detach_dev,
 		.map		= tegra_smmu_map,
diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index e3b812d8fa96..703d87922786 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -1017,6 +1017,7 @@ static struct iommu_ops viommu_ops = {
 	.of_xlate		= viommu_of_xlate,
 	.owner			= THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
+		.iommu_ops		= &viommu_ops,
 		.attach_dev		= viommu_attach_dev,
 		.map			= viommu_map,
 		.unmap			= viommu_unmap,
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 5e1afe169549..77deaf4fc7f8 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -261,6 +261,7 @@ struct iommu_ops {
 
 /**
  * struct iommu_domain_ops - domain specific operations
+ * @iommu_ops: Pointer to the ops associated with compatible devices
  * @attach_dev: attach an iommu domain to a device
  * @detach_dev: detach an iommu domain from a device
  * @map: map a physically contiguous memory region to an iommu domain
@@ -281,6 +282,7 @@ struct iommu_ops {
  * @free: Release the domain after use.
  */
 struct iommu_domain_ops {
+	const struct iommu_ops *iommu_ops;
 	int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
 	void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 
-- 
2.17.1




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