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drm/tegra: gem: Take into account IOMMU aperture

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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: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2015-01-19 16:15:04 +01:00
parent 3c1dae0a07
commit 4553f733c6
1 changed files with 10 additions and 2 deletions
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12
drivers/gpu/drm/tegra/drm.c
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@ -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);