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drm/ttm: Fix TTM BO accounting 

TTM BO accounting is out of sync with how memory is really allocated
in ttm[_dma]_tt_alloc_page_directory. This resulted in excessive
estimated overhead with many small allocations.

ttm_dma_tt_alloc_page_directory makes a single allocation for three
arrays: pages, DMA and CPU addresses. It uses drm_calloc_large, which
uses kmalloc internally for allocations smaller than PAGE_SIZE.
ttm_round_pot should be a good approximation of its memory usage both
above and below PAGE_SIZE.

Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Felix Kuehling 2016-04-07 21:42:17 -04:00 committed by Alex Deucher
parent 110e6f26af
commit 85621630f1
1 changed files with 2 additions and 3 deletions
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5
drivers/gpu/drm/ttm/ttm_bo.c
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@ -1215,7 +1215,7 @@ size_t ttm_bo_acc_size(struct ttm_bo_device *bdev,
size_t size = 0;
size += ttm_round_pot(struct_size);
size += PAGE_ALIGN(npages * sizeof(void *));
size += ttm_round_pot(npages * sizeof(void *));
size += ttm_round_pot(sizeof(struct ttm_tt));
return size;
}
@ -1229,8 +1229,7 @@ size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev,
size_t size = 0;
size += ttm_round_pot(struct_size);
size += PAGE_ALIGN(npages * sizeof(void *));
size += PAGE_ALIGN(npages * sizeof(dma_addr_t));
size += ttm_round_pot(npages * (2*sizeof(void *) + sizeof(dma_addr_t)));
size += ttm_round_pot(sizeof(struct ttm_dma_tt));
return size;
}