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drm/amdgpu: user temporary GTT as bounce buffer

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Currently, we have a limitted GTT memory size and need a bounce buffer
when doing buffer migration between VRAM and SYSTEM domain.

The problem is under GTT memory pressure we can't do buffer migration
between VRAM and SYSTEM domain. But in some cases we really need that.
Eespecially when validating a VRAM backing store BO which resides in
SYSTEM domain.

v2: still account temporary GTT allocations
v3 (chk): revert to the simpler change for now

Signed-off-by: Lang Yu <Lang.Yu@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210622162339.761651-2-andrey.grodzovsky@amd.com
This commit is contained in:
Lang Yu
2021-06-22 12:23:35 -04:00
committed by Andrey Grodzovsky
parent ae1bef72c2
commit 3e640f1bb8
2 changed files with 13 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
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@@ -132,14 +132,15 @@ static int amdgpu_gtt_mgr_new(struct ttm_resource_manager *man,
struct amdgpu_gtt_node *node;
int r;
spin_lock(&mgr->lock);
if (tbo->resource && tbo->resource->mem_type != TTM_PL_TT &&
atomic64_read(&mgr->available) < num_pages) {
if (!(place->flags & TTM_PL_FLAG_TEMPORARY)) {
spin_lock(&mgr->lock);
if (atomic64_read(&mgr->available) < num_pages) {
spin_unlock(&mgr->lock);
return -ENOSPC;
}
atomic64_sub(num_pages, &mgr->available);
spin_unlock(&mgr->lock);
return -ENOSPC;
}
atomic64_sub(num_pages, &mgr->available);
spin_unlock(&mgr->lock);
node = kzalloc(struct_size(node, base.mm_nodes, 1), GFP_KERNEL);
if (!node) {
@@ -175,7 +176,8 @@ err_free:
kfree(node);
err_out:
atomic64_add(num_pages, &mgr->available);
if (!(place->flags & TTM_PL_FLAG_TEMPORARY))
atomic64_add(num_pages, &mgr->available);
return r;
}
@@ -198,7 +200,9 @@ static void amdgpu_gtt_mgr_del(struct ttm_resource_manager *man,
if (drm_mm_node_allocated(&node->base.mm_nodes[0]))
drm_mm_remove_node(&node->base.mm_nodes[0]);
spin_unlock(&mgr->lock);
atomic64_add(res->num_pages, &mgr->available);
if (!(res->placement & TTM_PL_FLAG_TEMPORARY))
atomic64_add(res->num_pages, &mgr->available);
kfree(node);
}