drm/msm: use upstream iommu

Downstream kernel IOMMU had a non-standard way of dealing with multiple
devices and multiple ports/contexts.  We don't need that on upstream
kernel, so rip out the crazy.

Note that we have to move the pinning of the ringbuffer to after the
IOMMU is attached.  No idea how that managed to work properly on the
downstream kernel.

For now, I am leaving the IOMMU port name stuff in place, to simplify
things for folks trying to backport latest drm/msm to device kernels.
Once we no longer have to care about pre-DT kernels, we can drop this
and instead backport upstream IOMMU driver.

Signed-off-by: Rob Clark <robdclark@gmail.com>

1 files changed, 3 insertions, 28 deletions

diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
index 4b2ad9181edf..099af483fdf0 100644
--- a/drivers/gpu/drm/msm/msm_iommu.c
+++ b/drivers/gpu/drm/msm/msm_iommu.c
@@ -33,39 +33,14 @@ static int msm_fault_handler(struct iommu_domain *iommu, struct device *dev,
 
 static int msm_iommu_attach(struct msm_mmu *mmu, const char **names, int cnt)
 {
-	struct drm_device *dev = mmu->dev;
 	struct msm_iommu *iommu = to_msm_iommu(mmu);
-	int i, ret;
-
-	for (i = 0; i < cnt; i++) {
-		struct device *msm_iommu_get_ctx(const char *ctx_name);
-		struct device *ctx = msm_iommu_get_ctx(names[i]);
-		if (IS_ERR_OR_NULL(ctx)) {
-			dev_warn(dev->dev, "couldn't get %s context", names[i]);
-			continue;
-		}
-		ret = iommu_attach_device(iommu->domain, ctx);
-		if (ret) {
-			dev_warn(dev->dev, "could not attach iommu to %s", names[i]);
-			return ret;
-		}
-	}
-
-	return 0;
+	return iommu_attach_device(iommu->domain, mmu->dev);
 }
 
 static void msm_iommu_detach(struct msm_mmu *mmu, const char **names, int cnt)
 {
 	struct msm_iommu *iommu = to_msm_iommu(mmu);
-	int i;
-
-	for (i = 0; i < cnt; i++) {
-		struct device *msm_iommu_get_ctx(const char *ctx_name);
-		struct device *ctx = msm_iommu_get_ctx(names[i]);
-		if (IS_ERR_OR_NULL(ctx))
-			continue;
-		iommu_detach_device(iommu->domain, ctx);
-	}
+	iommu_detach_device(iommu->domain, mmu->dev);
 }
 
 static int msm_iommu_map(struct msm_mmu *mmu, uint32_t iova,
@@ -149,7 +124,7 @@ static const struct msm_mmu_funcs funcs = {
 		.destroy = msm_iommu_destroy,
 };
 
-struct msm_mmu *msm_iommu_new(struct drm_device *dev, struct iommu_domain *domain)
+struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain)
 {
 	struct msm_iommu *iommu;