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drm/tegra: Setup shared IOMMU domain after initialization

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Move initialization of the shared IOMMU domain after the host1x device
has been initialized. At this point all the Tegra DRM clients have been
attached to the shared IOMMU domain.

This is important because Tegra186 and later use an ARM SMMU, for which
the driver defers setting up the geometry for a domain until a device is
attached to it. This is to ensure that the domain is properly set up for
a specific ARM SMMU instance, which is unknown at allocation time.

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2019-02-01 14:28:33 +01:00
parent 77a0b09dd9
commit b9f8b09ce2
1 changed files with 29 additions and 25 deletions
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54
drivers/gpu/drm/tegra/drm.c
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@ -92,10 +92,6 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
return -ENOMEM;
if (iommu_present(&platform_bus_type)) {
u64 carveout_start, carveout_end, gem_start, gem_end;
struct iommu_domain_geometry *geometry;
unsigned long order;
tegra->domain = iommu_domain_alloc(&platform_bus_type);
if (!tegra->domain) {
err = -ENOMEM;
@ -105,27 +101,6 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
err = iova_cache_get();
if (err < 0)
goto domain;
geometry = &tegra->domain->geometry;
gem_start = geometry->aperture_start;
gem_end = geometry->aperture_end - CARVEOUT_SZ;
carveout_start = gem_end + 1;
carveout_end = geometry->aperture_end;
order = __ffs(tegra->domain->pgsize_bitmap);
init_iova_domain(&tegra->carveout.domain, 1UL << order,
carveout_start >> order);
tegra->carveout.shift = iova_shift(&tegra->carveout.domain);
tegra->carveout.limit = carveout_end >> tegra->carveout.shift;
drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1);
mutex_init(&tegra->mm_lock);
DRM_DEBUG("IOMMU apertures:\n");
DRM_DEBUG(" GEM: %#llx-%#llx\n", gem_start, gem_end);
DRM_DEBUG(" Carveout: %#llx-%#llx\n", carveout_start,
carveout_end);
}
mutex_init(&tegra->clients_lock);
@ -159,6 +134,35 @@ static int tegra_drm_load(struct drm_device *drm, unsigned long flags)
if (err < 0)
goto fbdev;
if (tegra->domain) {
u64 carveout_start, carveout_end, gem_start, gem_end;
dma_addr_t start, end;
unsigned long order;
start = tegra->domain->geometry.aperture_start;
end = tegra->domain->geometry.aperture_end;
gem_start = start;
gem_end = end - CARVEOUT_SZ;
carveout_start = gem_end + 1;
carveout_end = end;
order = __ffs(tegra->domain->pgsize_bitmap);
init_iova_domain(&tegra->carveout.domain, 1UL << order,
carveout_start >> order);
tegra->carveout.shift = iova_shift(&tegra->carveout.domain);
tegra->carveout.limit = carveout_end >> tegra->carveout.shift;
drm_mm_init(&tegra->mm, gem_start, gem_end - gem_start + 1);
mutex_init(&tegra->mm_lock);
DRM_DEBUG("IOMMU apertures:\n");
DRM_DEBUG(" GEM: %#llx-%#llx\n", gem_start, gem_end);
DRM_DEBUG(" Carveout: %#llx-%#llx\n", carveout_start,
carveout_end);
}
if (tegra->hub) {
err = tegra_display_hub_prepare(tegra->hub);
if (err < 0)