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drm/ttm: allocate dummy_read_page without DMA32 on fail

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Some platforms may not have any memory in ZONE_DMA32 and use IOMMU to allow
32-bit-DMA-only device to work. Forcing GFP_DMA32 on dummy_read_page will
fail on such platforms. Retry after fail will get this works on such
platforms.

Signed-off-by: Yangyu Chen <cyy@cyyself.name>
Link: https://patchwork.freedesktop.org/patch/msgid/tencent_8637383EE0A2C7CC870036AAF01909B26A0A@qq.com
Signed-off-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Yangyu Chen 2024-01-17 02:50:34 +08:00 committed by Christian König
parent 3fc6c76a8d
commit 0a8c1feed3
1 changed files with 9 additions and 3 deletions
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12
drivers/gpu/drm/ttm/ttm_device.c
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@ -95,11 +95,17 @@ static int ttm_global_init(void)
ttm_pool_mgr_init(num_pages);
ttm_tt_mgr_init(num_pages, num_dma32);
glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32);
glob->dummy_read_page = alloc_page(__GFP_ZERO | GFP_DMA32 |
__GFP_NOWARN);
/* Retry without GFP_DMA32 for platforms DMA32 is not available */
if (unlikely(glob->dummy_read_page == NULL)) {
ret = -ENOMEM;
goto out;
glob->dummy_read_page = alloc_page(__GFP_ZERO);
if (unlikely(glob->dummy_read_page == NULL)) {
ret = -ENOMEM;
goto out;
}
pr_warn("Using GFP_DMA32 fallback for dummy_read_page\n");
}
INIT_LIST_HEAD(&glob->device_list);