From: Roger He <Hongbo.He@amd.com>
Date: Thu, 21 Dec 2017 17:42:52 +0800
Subject: drm/ttm: add new function to check if bo is allowable to evict or
swapout
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Git-commit: d5769ba315d8ffcf6eeb90b6d7c99d3143547ddb
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/ttm/ttm_bo.c | 40 ++++++++++++++++++++++++++++++----------
1 file changed, 30 insertions(+), 10 deletions(-)
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -708,6 +708,34 @@ bool ttm_bo_eviction_valuable(struct ttm
}
EXPORT_SYMBOL(ttm_bo_eviction_valuable);
+/**
+ * Check the target bo is allowable to be evicted or swapout, including cases:
+ *
+ * a. if share same reservation object with ctx->resv, have assumption
+ * reservation objects should already be locked, so not lock again and
+ * return true directly when either the opreation allow_reserved_eviction
+ * or the target bo already is in delayed free list;
+ *
+ * b. Otherwise, trylock it.
+ */
+static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
+ struct ttm_operation_ctx *ctx, bool *locked)
+{
+ bool ret = false;
+
+ *locked = false;
+ if (bo->resv == ctx->resv) {
+ reservation_object_assert_held(bo->resv);
+ if (ctx->allow_reserved_eviction || !list_empty(&bo->ddestroy))
+ ret = true;
+ } else {
+ *locked = reservation_object_trylock(bo->resv);
+ ret = *locked;
+ }
+
+ return ret;
+}
+
static int ttm_mem_evict_first(struct ttm_bo_device *bdev,
uint32_t mem_type,
const struct ttm_place *place,
@@ -723,21 +751,13 @@ static int ttm_mem_evict_first(struct tt
spin_lock(&glob->lru_lock);
for (i = 0; i < TTM_MAX_BO_PRIORITY; ++i) {
list_for_each_entry(bo, &man->lru[i], lru) {
- if (bo->resv == ctx->resv) {
- if (!ctx->allow_reserved_eviction &&
- list_empty(&bo->ddestroy))
- continue;
- } else {
- locked = reservation_object_trylock(bo->resv);
- if (!locked)
- continue;
- }
+ if (!ttm_bo_evict_swapout_allowable(bo, ctx, &locked))
+ continue;
if (place && !bdev->driver->eviction_valuable(bo,
place)) {
if (locked)
reservation_object_unlock(bo->resv);
- locked = false;
continue;
}
break;