Am 12.06.19 um 09:26 schrieb Michel Dänzer:
On 2019-06-11 6:54 p.m., StDenis, Tom wrote:
(v2): Return 0 and set mem->mm_node to NULL.
Signed-off-by: Tom St Denis <[email protected]>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)
[...]
@@ -284,6 +284,14 @@ static int amdgpu_vram_mgr_new(struct ttm_mem_type_manager *man,
if (!lpfn)
lpfn = man->size;
+ /* bail out quickly if there's likely not enough VRAM for this BO */
+ atomic64_add(mem->num_pages << PAGE_SHIFT, &mgr->usage);
+ if (atomic64_read(&mgr->usage) > adev->gmc.mc_vram_size) {
Should probably use atomic64_add_return instead of atomic64_add +
atomic64_read.
Also, AFAICT this doesn't allow any VRAM overcommit, which seems a bit
conservative?
This is the low level VRAM manager. Here we can't overcomit anyway and
need to return early for TTM to evict things.
Christian.
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