From df67bed92fa86ef926da8b62a6da68722388ff72 Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Fri, 30 Oct 2009 13:31:26 +1000 Subject: [PATCH] drm/radeon/kms: fix coherency issues on AGP cards. When we are evicting from VRAM->RAM we allocate the ttm object, but we don't set the caching policy on it before blitting into it. This means on AGP we end up blitting into cached pages, and the CPU later flushes out on top of them. This was mostly seen as font corruption. The other question is why we don't evict VRAM->GTT in a lot of cases, this would save us some cache transitions since a lot of objects that are evicted from VRAM will probably end up being pulled back in a few operations later, and evicting them to system memory involves 2 unnecessary cache transitions. Signed-off-by: Dave Airlie --- drivers/gpu/drm/radeon/radeon_ttm.c | 6 ++++++ drivers/gpu/drm/ttm/ttm_tt.c | 1 + 2 files changed, 7 insertions(+) diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index c729cd1a7506..f489c0de6f13 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -295,6 +295,12 @@ static int radeon_move_vram_ram(struct ttm_buffer_object *bo, if (unlikely(r)) { return r; } + + r = ttm_tt_set_placement_caching(bo->ttm, tmp_mem.placement); + if (unlikely(r)) { + goto out_cleanup; + } + r = ttm_tt_bind(bo->ttm, &tmp_mem); if (unlikely(r)) { goto out_cleanup; diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index a55ee1a56c16..7bcb89f39ce8 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -279,6 +279,7 @@ int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement) return ttm_tt_set_caching(ttm, state); } +EXPORT_SYMBOL(ttm_tt_set_placement_caching); static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm) { -- 2.20.1