drm/msm: implement a2xx mmu

A2XX has its own very simple MMU.

Added a msm_use_mmu() function because we can't rely on iommu_present to
decide to use MMU or not.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Signed-off-by: Rob Clark <robdclark@gmail.com>

1 files changed, 19 insertions, 12 deletions

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index c3909ba75b12..6e079a83bd36 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -20,6 +20,7 @@
 #include "msm_mmu.h"
 #include "msm_fence.h"
 #include "msm_gpu_trace.h"
+#include "adreno/adreno_gpu.h"
 
 #include <generated/utsrelease.h>
 #include <linux/string_helpers.h>
@@ -822,7 +823,6 @@ static struct msm_gem_address_space *
 msm_gpu_create_address_space(struct msm_gpu *gpu, struct platform_device *pdev,
                 uint64_t va_start, uint64_t va_end)
 {
-        struct iommu_domain *iommu;
         struct msm_gem_address_space *aspace;
         int ret;
 
@@ -831,20 +831,27 @@ msm_gpu_create_address_space(struct msm_gpu *gpu, struct platform_device *pdev,
          * and have separate page tables per context.  For now, to keep things
          * simple and to get something working, just use a single address space:
          */
-        iommu = iommu_domain_alloc(&platform_bus_type);
-        if (!iommu)
-                return NULL;
-
-        iommu->geometry.aperture_start = va_start;
-        iommu->geometry.aperture_end = va_end;
-
-        DRM_DEV_INFO(gpu->dev->dev, "%s: using IOMMU\n", gpu->name);
+        if (!adreno_is_a2xx(to_adreno_gpu(gpu))) {
+                struct iommu_domain *iommu = iommu_domain_alloc(&platform_bus_type);
+                if (!iommu)
+                        return NULL;
+
+                iommu->geometry.aperture_start = va_start;
+                iommu->geometry.aperture_end = va_end;
+
+                DRM_DEV_INFO(gpu->dev->dev, "%s: using IOMMU\n", gpu->name);
+
+                aspace = msm_gem_address_space_create(&pdev->dev, iommu, "gpu");
+                if (IS_ERR(aspace))
+                        iommu_domain_free(iommu);
+        } else {
+                aspace = msm_gem_address_space_create_a2xx(&pdev->dev, gpu, "gpu",
+                        va_start, va_end);
+        }
 
-        aspace = msm_gem_address_space_create(&pdev->dev, iommu, "gpu");
         if (IS_ERR(aspace)) {
-                DRM_DEV_ERROR(gpu->dev->dev, "failed to init iommu: %ld\n",
+                DRM_DEV_ERROR(gpu->dev->dev, "failed to init mmu: %ld\n",
                         PTR_ERR(aspace));
-                iommu_domain_free(iommu);
                 return ERR_CAST(aspace);
         }