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drm/ttm: make TT creation purely optional v3

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We only need the page array when the BO is about to be accessed.

So not only populate, but also create it on demand.

v2: move NULL check into ttm_tt_create()
v3: fix the occurrence in ttm_bo_kmap_ttm as well

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Link: https://patchwork.freedesktop.org/patch/373182/
This commit is contained in:
Christian König 2020-06-24 15:15:20 +02:00
parent 58e4d686d4
commit 2ddef17678
4 changed files with 22 additions and 31 deletions
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37
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -292,12 +292,11 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
*/
if (!(new_man->flags & TTM_MEMTYPE_FLAG_FIXED)) {
if (bo->ttm == NULL) {
bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
ret = ttm_tt_create(bo, zero);
if (ret)
goto out_err;
}
bool zero = !(old_man->flags & TTM_MEMTYPE_FLAG_FIXED);
ret = ttm_tt_create(bo, zero);
if (ret)
goto out_err;
ret = ttm_tt_set_placement_caching(bo->ttm, mem->placement);
if (ret)
@ -660,13 +659,8 @@ static int ttm_bo_evict(struct ttm_buffer_object *bo,
placement.num_busy_placement = 0;
bdev->driver->evict_flags(bo, &placement);
if (!placement.num_placement && !placement.num_busy_placement) {
ret = ttm_bo_pipeline_gutting(bo);
if (ret)
return ret;
return ttm_tt_create(bo, false);
}
if (!placement.num_placement && !placement.num_busy_placement)
return ttm_bo_pipeline_gutting(bo);
evict_mem = bo->mem;
evict_mem.mm_node = NULL;
@ -1195,13 +1189,8 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
/*
* Remove the backing store if no placement is given.
*/
if (!placement->num_placement && !placement->num_busy_placement) {
ret = ttm_bo_pipeline_gutting(bo);
if (ret)
return ret;
return ttm_tt_create(bo, false);
}
if (!placement->num_placement && !placement->num_busy_placement)
return ttm_bo_pipeline_gutting(bo);
/*
* Check whether we need to move buffer.
@ -1218,14 +1207,6 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
ttm_flag_masked(&bo->mem.placement, new_flags,
~TTM_PL_MASK_MEMTYPE);
}
/*
* We might need to add a TTM.
*/
if (bo->mem.mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
ret = ttm_tt_create(bo, true);
if (ret)
return ret;
}
return 0;
}
EXPORT_SYMBOL(ttm_bo_validate);

7
drivers/gpu/drm/ttm/ttm_bo_util.c
View File

@ -532,12 +532,15 @@ static int ttm_bo_kmap_ttm(struct ttm_buffer_object *bo,
.interruptible = false,
.no_wait_gpu = false
};
struct ttm_tt *ttm = bo->ttm;
struct ttm_tt *ttm;
pgprot_t prot;
int ret;
BUG_ON(!ttm);
ret = ttm_tt_create(bo, true);
if (ret)
return ret;
ttm = bo->ttm;
ret = ttm_tt_populate(ttm, &ctx);
if (ret)
return ret;

5
drivers/gpu/drm/ttm/ttm_bo_vm.c
View File

@ -349,6 +349,11 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
};
if (ttm_tt_create(bo, true)) {
ret = VM_FAULT_OOM;
goto out_io_unlock;
}
ttm = bo->ttm;
if (ttm_tt_populate(bo->ttm, &ctx)) {
ret = VM_FAULT_OOM;

4
drivers/gpu/drm/ttm/ttm_tt.c
View File

@ -50,6 +50,9 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
dma_resv_assert_held(bo->base.resv);
if (bo->ttm)
return 0;
if (bdev->need_dma32)
page_flags |= TTM_PAGE_FLAG_DMA32;
@ -67,7 +70,6 @@ int ttm_tt_create(struct ttm_buffer_object *bo, bool zero_alloc)
page_flags |= TTM_PAGE_FLAG_SG;
break;
default:
bo->ttm = NULL;
pr_err("Illegal buffer object type\n");
return -EINVAL;
}