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drm/ttm: add new function to check if bo is allowable to evict or swapout
extract a function as ttm_bo_evict_swapout_allowable since eviction and swapout can share same logic. v2: modify commit message and add description in the code Reviewed-by: Thomas Hellström <thellstrom@vmware.com> Reviewed-by: Christian König <christian.koenig@amd.com> Reviewed-by: Chuming Zhou <david1.zhou@amd.com> Signed-off-by: Roger He <Hongbo.He@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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@ -708,6 +708,34 @@ bool ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
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}
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EXPORT_SYMBOL(ttm_bo_eviction_valuable);
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/**
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* Check the target bo is allowable to be evicted or swapout, including cases:
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*
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* a. if share same reservation object with ctx->resv, have assumption
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* reservation objects should already be locked, so not lock again and
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* return true directly when either the opreation allow_reserved_eviction
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* or the target bo already is in delayed free list;
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*
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* b. Otherwise, trylock it.
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*/
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static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
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struct ttm_operation_ctx *ctx, bool *locked)
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{
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bool ret = false;
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*locked = false;
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if (bo->resv == ctx->resv) {
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reservation_object_assert_held(bo->resv);
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if (ctx->allow_reserved_eviction || !list_empty(&bo->ddestroy))
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ret = true;
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} else {
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*locked = reservation_object_trylock(bo->resv);
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ret = *locked;
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}
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return ret;
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}
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static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
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uint32_t mem_type,
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const struct ttm_place *place,
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@ -723,21 +751,13 @@ static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
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spin_lock(&glob->lru_lock);
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for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
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list_for_each_entry(bo, &man->lru[i], lru) {
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if (bo->resv == ctx->resv) {
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if (!ctx->allow_reserved_eviction &&
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list_empty(&bo->ddestroy))
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continue;
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} else {
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locked = reservation_object_trylock(bo->resv);
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if (!locked)
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continue;
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}
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if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked))
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continue;
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if (place && !bdev->driver->eviction_valuable(bo,
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place)) {
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if (locked)
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reservation_object_unlock(bo->resv);
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locked = false;
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continue;
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}
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break;
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