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drm/amdgpu: Map all visible VRAM at startup 

When using CPU to update page table, we need to kmap all the PDs/PTs after
they are allocated and that requires a TLB shot down on each CPU, which is
quite heavy.

Instead, we map the whole visible VRAM to a kernel address at once. Pages
can be obtained from the offset.

v2: move the mapping base from gmc to amdgpu_mman structure, and the
    implementation in amdgpu_ttm_* functions

Signed-off-by: Amber Lin <Amber.Lin@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Amber Lin 2018-02-27 10:01:59 -05:00 committed by Alex Deucher
parent 5d447f09b8
commit f8f4b9a679
2 changed files with 18 additions and 0 deletions
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17
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
View File

@ -621,6 +621,7 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
{
struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
struct amdgpu_device *adev = amdgpu_ttm_adev(bdev);
struct drm_mm_node *mm_node = mem->mm_node;
mem->bus.addr = NULL;
mem->bus.offset = 0;
@ -640,6 +641,15 @@ static int amdgpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_
/* check if it's visible */
if ((mem->bus.offset + mem->bus.size) > adev->gmc.visible_vram_size)
return -EINVAL;
/* Only physically contiguous buffers apply. In a contiguous
* buffer, size of the first mm_node would match the number of
* pages in ttm_mem_reg.
*/
if (adev->mman.aper_base_kaddr &&
(mm_node->size == mem->num_pages))
mem->bus.addr = (u8 *)adev->mman.aper_base_kaddr +
mem->bus.offset;
mem->bus.base = adev->gmc.aper_base;
mem->bus.is_iomem = true;
break;
@ -1402,6 +1412,10 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
/* Change the size here instead of the init above so only lpfn is affected */
amdgpu_ttm_set_active_vram_size(adev, adev->gmc.visible_vram_size);
#ifdef CONFIG_64BIT
adev->mman.aper_base_kaddr = ioremap_wc(adev->gmc.aper_base,
adev->gmc.visible_vram_size);
#endif
/*
*The reserved vram for firmware must be pinned to the specified
@ -1494,6 +1508,9 @@ void amdgpu_ttm_fini(struct amdgpu_device *adev)
amdgpu_ttm_debugfs_fini(adev);
amdgpu_bo_free_kernel(&adev->stolen_vga_memory, NULL, NULL);
amdgpu_ttm_fw_reserve_vram_fini(adev);
if (adev->mman.aper_base_kaddr)
iounmap(adev->mman.aper_base_kaddr);
adev->mman.aper_base_kaddr = NULL;
ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_VRAM);
ttm_bo_clean_mm(&adev->mman.bdev, TTM_PL_TT);

1
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
View File

@ -44,6 +44,7 @@ struct amdgpu_mman {
struct ttm_bo_device bdev;
bool mem_global_referenced;
bool initialized;
void __iomem *aper_base_kaddr;
#if defined(CONFIG_DEBUG_FS)
struct dentry *debugfs_entries[8];