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| author | Christian König <christian.koenig@amd.com> | 2014-09-17 12:00:05 +0200 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2014-09-19 00:44:52 +0200 |
| commit | 3840a656f61fdc504f1b0c6617f6af800d551efe (patch) | |
| tree | ac2c05bcab401670711ad824613294b5cf361162 | |
| parent | Merge branch 'drm/next/du' of git://linuxtv.org/pinchartl/fbdev into drm-next (diff) | |
| download | linux-3840a656f61fdc504f1b0c6617f6af800d551efe.tar.xz linux-3840a656f61fdc504f1b0c6617f6af800d551efe.zip | |
drm/radeon: fix AGP userptr handling
AGP mappings are not cache coherent, so userptr support
won't work. Additional to that the AGP implementation uses
a different ttm_tt container structure so we run into
problems if we cast the pointer without checking if it's
the right type.
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/radeon/radeon_ttm.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index eca2ce60d440..d73ea9c04227 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -675,10 +675,17 @@ static struct ttm_tt *radeon_ttm_tt_create(struct ttm_bo_device *bdev, return >t->ttm.ttm; } +static struct radeon_ttm_tt *radeon_ttm_tt_to_gtt(struct ttm_tt *ttm) +{ + if (!ttm || ttm->func != &radeon_backend_func) + return NULL; + return (struct radeon_ttm_tt *)ttm; +} + static int radeon_ttm_tt_populate(struct ttm_tt *ttm) { + struct radeon_ttm_tt *gtt = radeon_ttm_tt_to_gtt(ttm); struct radeon_device *rdev; - struct radeon_ttm_tt *gtt = (void *)ttm; unsigned i; int r; bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG); @@ -686,7 +693,7 @@ static int radeon_ttm_tt_populate(struct ttm_tt *ttm) if (ttm->state != tt_unpopulated) return 0; - if (gtt->userptr) { + if (gtt && gtt->userptr) { ttm->sg = kcalloc(1, sizeof(struct sg_table), GFP_KERNEL); if (!ttm->sg) return -ENOMEM; @@ -741,11 +748,11 @@ static int radeon_ttm_tt_populate(struct ttm_tt *ttm) static void radeon_ttm_tt_unpopulate(struct ttm_tt *ttm) { struct radeon_device *rdev; - struct radeon_ttm_tt *gtt = (void *)ttm; + struct radeon_ttm_tt *gtt = radeon_ttm_tt_to_gtt(ttm); unsigned i; bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG); - if (gtt->userptr) { + if (gtt && gtt->userptr) { kfree(ttm->sg); ttm->page_flags &= ~TTM_PAGE_FLAG_SG; return; @@ -782,7 +789,7 @@ static void radeon_ttm_tt_unpopulate(struct ttm_tt *ttm) int radeon_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr, uint32_t flags) { - struct radeon_ttm_tt *gtt = (void *)ttm; + struct radeon_ttm_tt *gtt = radeon_ttm_tt_to_gtt(ttm); if (gtt == NULL) return -EINVAL; @@ -795,7 +802,7 @@ int radeon_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr, bool radeon_ttm_tt_has_userptr(struct ttm_tt *ttm) { - struct radeon_ttm_tt *gtt = (void *)ttm; + struct radeon_ttm_tt *gtt = radeon_ttm_tt_to_gtt(ttm); if (gtt == NULL) return false; @@ -805,7 +812,7 @@ bool radeon_ttm_tt_has_userptr(struct ttm_tt *ttm) bool radeon_ttm_tt_is_readonly(struct ttm_tt *ttm) { - struct radeon_ttm_tt *gtt = (void *)ttm; + struct radeon_ttm_tt *gtt = radeon_ttm_tt_to_gtt(ttm); if (gtt == NULL) return false; |