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drm/ttm: add ttm_sg_tt_init 

This allows drivers to only allocate dma addresses, but not a page
array.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Roger He <Hongbo.He@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2018-02-23 15:12:00 +01:00 committed by Alex Deucher
parent 81f5ec0255
commit 75a57669cb
2 changed files with 47 additions and 9 deletions
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54
drivers/gpu/drm/ttm/ttm_tt.c
View File

@ -108,6 +108,16 @@ static int ttm_dma_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
return 0;
}
static int ttm_sg_tt_alloc_page_directory(struct ttm_dma_tt *ttm)
{
ttm->dma_address = kvmalloc_array(ttm->ttm.num_pages,
sizeof(*ttm->dma_address),
GFP_KERNEL | __GFP_ZERO);
if (!ttm->dma_address)
return -ENOMEM;
return 0;
}
#ifdef CONFIG_X86
static inline int ttm_tt_set_page_caching(struct page *p,
enum ttm_caching_state c_old,
@ -227,8 +237,8 @@ void ttm_tt_destroy(struct ttm_tt *ttm)
ttm->func->destroy(ttm);
}
int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
unsigned long size, uint32_t page_flags)
void ttm_tt_init_fields(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
unsigned long size, uint32_t page_flags)
{
ttm->bdev = bdev;
ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
@ -236,6 +246,12 @@ int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
ttm->page_flags = page_flags;
ttm->state = tt_unpopulated;
ttm->swap_storage = NULL;
}
int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
unsigned long size, uint32_t page_flags)
{
ttm_tt_init_fields(ttm, bdev, size, page_flags);
if (ttm_tt_alloc_page_directory(ttm)) {
ttm_tt_destroy(ttm);
@ -258,12 +274,7 @@ int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
{
struct ttm_tt *ttm = &ttm_dma->ttm;
ttm->bdev = bdev;
ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
ttm->caching_state = tt_cached;
ttm->page_flags = page_flags;
ttm->state = tt_unpopulated;
ttm->swap_storage = NULL;
ttm_tt_init_fields(ttm, bdev, size, page_flags);
INIT_LIST_HEAD(&ttm_dma->pages_list);
if (ttm_dma_tt_alloc_page_directory(ttm_dma)) {
@ -275,11 +286,36 @@ int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
}
EXPORT_SYMBOL(ttm_dma_tt_init);
int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
unsigned long size, uint32_t page_flags)
{
struct ttm_tt *ttm = &ttm_dma->ttm;
int ret;
ttm_tt_init_fields(ttm, bdev, size, page_flags);
INIT_LIST_HEAD(&ttm_dma->pages_list);
if (page_flags & TTM_PAGE_FLAG_SG)
ret = ttm_sg_tt_alloc_page_directory(ttm_dma);
else
ret = ttm_dma_tt_alloc_page_directory(ttm_dma);
if (ret) {
ttm_tt_destroy(ttm);
pr_err("Failed allocating page table\n");
return -ENOMEM;
}
return 0;
}
EXPORT_SYMBOL(ttm_sg_tt_init);
void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
{
struct ttm_tt *ttm = &ttm_dma->ttm;
kvfree(ttm->pages);
if (ttm->pages)
kvfree(ttm->pages);
else
kvfree(ttm_dma->dma_address);
ttm->pages = NULL;
ttm_dma->dma_address = NULL;
}

2
include/drm/ttm/ttm_tt.h
View File

@ -163,6 +163,8 @@ int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
unsigned long size, uint32_t page_flags);
int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
unsigned long size, uint32_t page_flags);
int ttm_sg_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
unsigned long size, uint32_t page_flags);
/**
* ttm_tt_fini