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SubjectRe: [PATCH 06/11] ttm/driver: Expand ttm_backend_func to include two overrides for TTM page pool.
Konrad,

I was hoping that we could get rid of the dma_address shuffling into
core TTM,
like I mentioned in the review. From what I can tell it's now only used
in the backend and
core ttm doesn't care about it.

Is there a particular reason we're still passing it around?

Thanks,
/Thomas




On 10/20/2011 12:19 AM, Konrad Rzeszutek Wilk wrote:
> The two overrides will be choosen by the backends whether they
> want to use a different TTM page pool than the default.
>
> If the backend does not choose a new override, the default one
> will be used.
>
> Signed-off-by: Konrad Rzeszutek Wilk<konrad.wilk@oracle.com>
> ---
> drivers/gpu/drm/ttm/ttm_page_alloc.c | 10 +++++++---
> include/drm/ttm/ttm_bo_driver.h | 31 +++++++++++++++++++++++++++++++
> 2 files changed, 38 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
> index 24c0340..360afb3 100644
> --- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
> +++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
> @@ -861,13 +861,17 @@ EXPORT_SYMBOL(ttm_page_alloc_debugfs);
> int ttm_get_pages(struct ttm_tt *ttm, struct list_head *pages,
> unsigned count, dma_addr_t *dma_address)
> {
> + if (ttm->be&& ttm->be->func&& ttm->be->func->get_pages)
> + return ttm->be->func->get_pages(ttm, pages, count, dma_address);
> return __ttm_get_pages(pages, ttm->page_flags, ttm->caching_state,
> count, dma_address);
> }
> -{
> void ttm_put_pages(struct ttm_tt *ttm, struct list_head *pages,
> unsigned page_count, dma_addr_t *dma_address)
> {
> - __ttm_put_pages(pages, page_count, ttm->page_flags, ttm->caching_state,
> - dma_address);
> + if (ttm->be&& ttm->be->func&& ttm->be->func->put_pages)
> + ttm->be->func->put_pages(ttm, pages, page_count, dma_address);
> + else
> + __ttm_put_pages(pages, page_count, ttm->page_flags,
> + ttm->caching_state, dma_address);
> }
> diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
> index 09af2d7..1826c3b 100644
> --- a/include/drm/ttm/ttm_bo_driver.h
> +++ b/include/drm/ttm/ttm_bo_driver.h
> @@ -100,6 +100,34 @@ struct ttm_backend_func {
> * Destroy the backend.
> */
> void (*destroy) (struct ttm_backend *backend);
> +
> + /**
> + * ttm_get_pages override. The backend can override the default
> + * TTM page pool code with a different one.
> + *
> + * Get count number of pages from pool to pages list.
> + *
> + * @ttm: ttm which contains flags for page allocation and caching state.
> + * @pages: head of empty linked list where pages are filled.
> + * @dma_address: The DMA (bus) address of pages
> + */
> + int (*get_pages) (struct ttm_tt *ttm, struct list_head *pages,
> + unsigned count, dma_addr_t *dma_address);
> +
> + /**
> + * ttm_put_pages override. The backend can override the default
> + * TTM page pool code with a different implementation.
> + *
> + * Put linked list of pages to pool.
> + *
> + * @ttm: ttm which contains flags for page allocation and caching state.
> + * @pages: list of pages to free.
> + * @page_count: number of pages in the list. Zero can be passed for
> + * unknown count.
> + * @dma_address: The DMA (bus) address of pages
> + */
> + void (*put_pages) (struct ttm_tt *ttm, struct list_head *pages,
> + unsigned page_count, dma_addr_t *dma_address);
> };
>
> /**
> @@ -109,6 +137,8 @@ struct ttm_backend_func {
> * @flags: For driver use.
> * @func: Pointer to a struct ttm_backend_func that describes
> * the backend methods.
> + * @dev: Pointer to a struct device which can be used by the TTM
> + * [get|put)_pages overrides in 'struct ttm_backend_func'.
> *
> */
>
> @@ -116,6 +146,7 @@ struct ttm_backend {
> struct ttm_bo_device *bdev;
> uint32_t flags;
> struct ttm_backend_func *func;
> + struct device *dev;
> };
>
> #define TTM_PAGE_FLAG_USER (1<< 1)
>





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