Am 14.04.21 um 11:15 schrieb Daniel Vetter:
On Wed, Apr 14, 2021 at 08:51:51AM +0200, Christian König wrote:
Am 14.04.21 um 08:48 schrieb Felix Kuehling:
Pages in SG BOs were not allocated by TTM. So don't count them against TTM's pages limit.
Signed-off-by: Felix Kuehling Felix.Kuehling@amd.com
Reviewed-by: Christian König christian.koenig@amd.com
Going to pick that one up for inclusion in drm-misc-next.
See my other email, but why do we need this? A bit more explanation is imo needed here at least, since we still need to guarantee that allocations don't over the limit in total for all gpu buffers together. At least until the shrinker has landed.
And this here just opens up the barn door without any explanation why it's ok.
The SG based BOs might not even be backed by pages. E.g. exported VRAM.
So either they are exported by a driver which should have accounted for the allocation, exported by TTM which already did the accounting or doesn't even point to pages at all.
This is really a bug fix to recreate the behavior we had before moving the accounting to this place.
Christian.
-Daniel
Regards, Christian.
drivers/gpu/drm/ttm/ttm_tt.c | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c index 5d8820725b75..e8b8c3257392 100644 --- a/drivers/gpu/drm/ttm/ttm_tt.c +++ b/drivers/gpu/drm/ttm/ttm_tt.c @@ -317,9 +317,12 @@ int ttm_tt_populate(struct ttm_device *bdev, if (ttm_tt_is_populated(ttm)) return 0;
- atomic_long_add(ttm->num_pages, &ttm_pages_allocated);
- if (bdev->pool.use_dma32)
atomic_long_add(ttm->num_pages, &ttm_dma32_pages_allocated);
- if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
atomic_long_add(ttm->num_pages, &ttm_pages_allocated);if (bdev->pool.use_dma32)atomic_long_add(ttm->num_pages,&ttm_dma32_pages_allocated);- } while (atomic_long_read(&ttm_pages_allocated) > ttm_pages_limit || atomic_long_read(&ttm_dma32_pages_allocated) >
@@ -350,9 +353,12 @@ int ttm_tt_populate(struct ttm_device *bdev, return 0; error:
- atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
- if (bdev->pool.use_dma32)
atomic_long_sub(ttm->num_pages, &ttm_dma32_pages_allocated);
- if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);if (bdev->pool.use_dma32)atomic_long_sub(ttm->num_pages,&ttm_dma32_pages_allocated);- } return ret; } EXPORT_SYMBOL(ttm_tt_populate);
@@ -382,9 +388,12 @@ void ttm_tt_unpopulate(struct ttm_device *bdev, struct ttm_tt *ttm) else ttm_pool_free(&bdev->pool, ttm);
- atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);
- if (bdev->pool.use_dma32)
atomic_long_sub(ttm->num_pages, &ttm_dma32_pages_allocated);
- if (!(ttm->page_flags & TTM_PAGE_FLAG_SG)) {
atomic_long_sub(ttm->num_pages, &ttm_pages_allocated);if (bdev->pool.use_dma32)atomic_long_sub(ttm->num_pages,&ttm_dma32_pages_allocated);- } ttm->page_flags &= ~TTM_PAGE_FLAG_PRIV_POPULATED; }
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