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Commit 4553f733 authored by Thierry Reding's avatar Thierry Reding
Browse files

drm/tegra: gem: Take into account IOMMU aperture 



The IOMMU may not always be able to address 2 GiB of memory. On Tegra20,
the GART supports 32 MiB starting at 0x58000000. Also the aperture on
Tegra30 and later is in fact the full 4 GiB, rather than just 2 GiB as
currently assumed.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 3c1dae0a

drivers/gpu/drm/tegra/drm.c

+10 −2
Original line number Diff line number Diff line
@@ -124,14 +124,22 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags) 
		return -ENOMEM;



	if (iommu_present(&platform_bus_type)) {

		struct iommu_domain_geometry *geometry;

		u64 start, end;



		tegra->domain = iommu_domain_alloc(&platform_bus_type);

		if (!tegra->domain) {

			err = -ENOMEM;

			goto free;

		}



		DRM_DEBUG("IOMMU context initialized\n");

		drm_mm_init(&tegra->mm, 0, SZ_2G);

		geometry = &tegra->domain->geometry;

		start = geometry->aperture_start;

		end = geometry->aperture_end;



		DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",

			  start, end);

		drm_mm_init(&tegra->mm, start, end - start + 1);

	}



	mutex_init(&tegra->clients_lock);