From 4553f733c68b66ef49f838aa24470d58caf76ff5 Mon Sep 17 00:00:00 2001 From: Thierry Reding Date: Mon, 19 Jan 2015 16:15:04 +0100 Subject: 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: Thierry Reding --- drivers/gpu/drm/tegra/drm.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) (limited to 'drivers/gpu/drm/tegra') diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c index 1833abd7d3aa..106208463b37 100644 --- a/drivers/gpu/drm/tegra/drm.c +++ b/drivers/gpu/drm/tegra/drm.c @@ -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); -- cgit v1.2.3