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drm/amdgpu: restructure amdgpu_vram_mgr_new

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Merge the two loops, loosen the restriction for big allocations.
This reduces the CPU overhead in the good case, but increases
it a bit under memory pressure.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-and-Tested-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2021-04-26 10:06:13 +02:00 • committed by Alex Deucher
parent c0f76fc8ad
commit dd03daec0f
1 changed files with 28 additions and 32 deletions
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60
drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
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@ -358,13 +358,13 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
const struct ttm_place *place,
struct ttm_resource *mem)
{
unsigned long lpfn, num_nodes, pages_per_node, pages_left, pages;
struct amdgpu_vram_mgr *mgr = to_vram_mgr(man);
struct amdgpu_device *adev = to_amdgpu_device(mgr);
struct drm_mm *mm = &mgr->mm;
struct drm_mm_node *nodes;
enum drm_mm_insert_mode mode;
unsigned long lpfn, num_nodes, pages_per_node, pages_left;
uint64_t vis_usage = 0, mem_bytes, max_bytes;
struct drm_mm *mm = &mgr->mm;
enum drm_mm_insert_mode mode;
struct drm_mm_node *nodes;
unsigned i;
int r;
@ -391,9 +391,10 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
pages_per_node = HPAGE_PMD_NR;
#else
/* default to 2MB */
pages_per_node = (2UL << (20UL - PAGE_SHIFT));
pages_per_node = 2UL << (20UL - PAGE_SHIFT);
#endif
pages_per_node = max((uint32_t)pages_per_node, mem->page_alignment);
pages_per_node = max_t(uint32_t, pages_per_node,
mem->page_alignment);
num_nodes = DIV_ROUND_UP(mem->num_pages, pages_per_node);
}
@ -411,42 +412,37 @@ static int amdgpu_vram_mgr_new(struct ttm_resource_manager *man,
mem->start = 0;
pages_left = mem->num_pages;
/* Limit maximum size to 2GB due to SG table limitations */
pages = min(pages_left, 2UL << (30 - PAGE_SHIFT));
i = 0;
spin_lock(&mgr->lock);
for (i = 0; pages_left >= pages_per_node; ++i) {
unsigned long pages = rounddown_pow_of_two(pages_left);
/* Limit maximum size to 2GB due to SG table limitations */
pages = min(pages, (2UL << (30 - PAGE_SHIFT)));
r = drm_mm_insert_node_in_range(mm, &nodes[i], pages,
pages_per_node, 0,
place->fpfn, lpfn,
mode);
if (unlikely(r))
break;
vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
pages_left -= pages;
}
for (; pages_left; ++i) {
unsigned long pages = min(pages_left, pages_per_node);
while (pages_left) {
uint32_t alignment = mem->page_alignment;
if (pages == pages_per_node)
if (pages >= pages_per_node)
alignment = pages_per_node;
r = drm_mm_insert_node_in_range(mm, &nodes[i],
pages, alignment, 0,
place->fpfn, lpfn,
mode);
if (unlikely(r))
r = drm_mm_insert_node_in_range(mm, &nodes[i], pages, alignment,
0, place->fpfn, lpfn, mode);
if (unlikely(r)) {
if (pages > pages_per_node) {
if (is_power_of_2(pages))
pages = pages / 2;
else
pages = rounddown_pow_of_two(pages);
continue;
}
goto error;
}
vis_usage += amdgpu_vram_mgr_vis_size(adev, &nodes[i]);
amdgpu_vram_mgr_virt_start(mem, &nodes[i]);
pages_left -= pages;
++i;
if (pages > pages_left)
pages = pages_left;
}
spin_unlock(&mgr->lock);