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io_uring/zcrx: deduplicate area mapping 

With a common type for storing dma addresses and io_populate_area_dma(),
type-specific area mapping helpers are trivial, so open code them and
deduplicate the call to io_populate_area_dma().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
pull/1354/merge
Pavel Begunkov 2025-09-16 15:27:52 +01:00 committed by Jens Axboe
parent 02bb047b5f
commit 439a98b972
1 changed files with 14 additions and 23 deletions
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37
io_uring/zcrx.c
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@ -157,14 +157,6 @@ err:
return ret;
}
static int io_zcrx_map_area_dmabuf(struct io_zcrx_ifq *ifq, struct io_zcrx_area *area)
{
if (!IS_ENABLED(CONFIG_DMA_SHARED_BUFFER))
return -EINVAL;
return io_populate_area_dma(ifq, area, area->mem.sgt,
area->mem.dmabuf_offset);
}
static unsigned long io_count_account_pages(struct page **pages, unsigned nr_pages)
{
struct folio *last_folio = NULL;
@ -275,30 +267,29 @@ static void io_zcrx_unmap_area(struct io_zcrx_ifq *ifq,
}
}
static unsigned io_zcrx_map_area_umem(struct io_zcrx_ifq *ifq, struct io_zcrx_area *area)
{
int ret;
ret = dma_map_sgtable(ifq->dev, &area->mem.page_sg_table,
DMA_FROM_DEVICE, IO_DMA_ATTR);
if (ret < 0)
return ret;
return io_populate_area_dma(ifq, area, &area->mem.page_sg_table, 0);
}
static int io_zcrx_map_area(struct io_zcrx_ifq *ifq, struct io_zcrx_area *area)
{
unsigned long offset;
struct sg_table *sgt;
int ret;
guard(mutex)(&ifq->dma_lock);
if (area->is_mapped)
return 0;
if (area->mem.is_dmabuf)
ret = io_zcrx_map_area_dmabuf(ifq, area);
else
ret = io_zcrx_map_area_umem(ifq, area);
if (!area->mem.is_dmabuf) {
ret = dma_map_sgtable(ifq->dev, &area->mem.page_sg_table,
DMA_FROM_DEVICE, IO_DMA_ATTR);
if (ret < 0)
return ret;
sgt = &area->mem.page_sg_table;
offset = 0;
} else {
sgt = area->mem.sgt;
offset = area->mem.dmabuf_offset;
}
ret = io_populate_area_dma(ifq, area, sgt, offset);
if (ret == 0)
area->is_mapped = true;
return ret;