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drm/ttm: switch back to static allocation limits for now

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The shrinker based approach still has some flaws. Especially that we need
temporary pages to free up the pages allocated to the driver is problematic
in a shrinker.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210324134845.2338-1-christian.koenig@amd.com
This commit is contained in:
Christian König
2021-03-24 13:50:56 +01:00
parent e55f2ffc4d
commit 680dcede27
3 changed files with 54 additions and 77 deletions
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14
drivers/gpu/drm/ttm/ttm_device.c
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@@ -53,7 +53,6 @@ static void ttm_global_release(void)
goto out;
ttm_pool_mgr_fini();
ttm_tt_mgr_fini();
__free_page(glob->dummy_read_page);
memset(glob, 0, sizeof(*glob));
@@ -64,7 +63,7 @@ out:
static int ttm_global_init(void)
{
struct ttm_global *glob = &ttm_glob;
unsigned long num_pages;
unsigned long num_pages, num_dma32;
struct sysinfo si;
int ret = 0;
@@ -78,8 +77,15 @@ static int ttm_global_init(void)
* system memory.
*/
num_pages = ((u64)si.totalram * si.mem_unit) >> PAGE_SHIFT;
ttm_pool_mgr_init(num_pages * 50 / 100);
ttm_tt_mgr_init();
num_pages /= 2;
/* But for DMA32 we limit ourself to only use 2GiB maximum. */
num_dma32 = (u64)(si.totalram - si.totalhigh) * si.mem_unit
>> PAGE_SHIFT;
num_dma32 = min(num_dma32, 2UL << (30 - PAGE_SHIFT));
ttm_pool_mgr_init(num_pages);
ttm_tt_mgr_init(num_pages, num_dma32);
glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);