Hi Mel,
Can you please CC me in future revisions. I almost missed that!
On Mon, Mar 01, 2021 at 04:11:59PM +0000, Mel Gorman wrote:
> From: Jesper Dangaard Brouer <bro...@redhat.com>
>
> In preparation for next patch, move the dma mapping into its own
> function, as this will make it easier to follow the changes.
>
> V2: make page_pool_dma_map return boolean (Ilias)
>
[...]
> static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
> gfp_t _gfp)
> {
> + unsigned int pp_flags = pool->p.flags;
> struct page *page;
> gfp_t gfp = _gfp;
> - dma_addr_t dma;
>
> /* We could always set __GFP_COMP, and avoid this branch, as
> * prep_new_page() can handle order-0 with __GFP_COMP.
> @@ -211,30 +234,14 @@ static struct page *__page_pool_alloc_pages_slow(struct
> page_pool *pool,
> if (!page)
> return NULL;
>
> - if (!(pool->p.flags & PP_FLAG_DMA_MAP))
> - goto skip_dma_map;
> -
> - /* Setup DMA mapping: use 'struct page' area for storing DMA-addr
> - * since dma_addr_t can be either 32 or 64 bits and does not always fit
> - * into page private data (i.e 32bit cpu with 64bit DMA caps)
> - * This mapping is kept for lifetime of page, until leaving pool.
> - */
> - dma = dma_map_page_attrs(pool->p.dev, page, 0,
> - (PAGE_SIZE << pool->p.order),
> - pool->p.dma_dir, DMA_ATTR_SKIP_CPU_SYNC);
> - if (dma_mapping_error(pool->p.dev, dma)) {
> + if (pp_flags & PP_FLAG_DMA_MAP &&
Nit pick but can we have if ((pp_flags & PP_FLAG_DMA_MAP) && ...
> + unlikely(!page_pool_dma_map(pool, page))) {
> put_page(page);
> return NULL;
> }
> - page->dma_addr = dma;
>
> - if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV)
> - page_pool_dma_sync_for_device(pool, page, pool->p.max_len);
> -
> -skip_dma_map:
> /* Track how many pages are held 'in-flight' */
> pool->pages_state_hold_cnt++;
> -
> trace_page_pool_state_hold(pool, page, pool->pages_state_hold_cnt);
>
> /* When page just alloc'ed is should/must have refcnt 1. */
> --
> 2.26.2
>
Otherwise
Reviewed-by: Ilias Apalodimas <ilias.apalodi...@linaro.org>
