diff mbox series

[v11,7/9] block: set FOLL_PCI_P2PDMA in bio_map_user_iov()

Message ID 20221021174116.7200-8-logang@deltatee.com
State New
Headers
Series Userspace P2PDMA with O_DIRECT NVMe devices |

Commit Message

Logan Gunthorpe Oct. 21, 2022, 5:41 p.m. UTC 
  When a bio's queue supports PCI P2PDMA, set FOLL_PCI_P2PDMA for
iov_iter_get_pages_flags(). This allows PCI P2PDMA pages to be
passed from userspace and enables the NVMe passthru requests to
use P2PDMA pages.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
---
 block/blk-map.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

Comments

Chaitanya Kulkarni Oct. 25, 2022, 1:26 a.m. UTC | #1 
On 10/21/22 10:41, Logan Gunthorpe wrote:
> When a bio's queue supports PCI P2PDMA, set FOLL_PCI_P2PDMA for
> iov_iter_get_pages_flags(). This allows PCI P2PDMA pages to be
> passed from userspace and enables the NVMe passthru requests to
> use P2PDMA pages.
> 
> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: John Hubbard <jhubbard@nvidia.com>
> ---
>   block/blk-map.c | 12 ++++++++----

Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>

-ck
diff mbox series

Patch

diff --git a/block/blk-map.c b/block/blk-map.c
index 34735626b00f..8750f82d7da4 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -267,6 +267,7 @@  static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
 {
 	unsigned int max_sectors = queue_max_hw_sectors(rq->q);
 	unsigned int nr_vecs = iov_iter_npages(iter, BIO_MAX_VECS);
+	unsigned int gup_flags = 0;
 	struct bio *bio;
 	int ret;
 	int j;
@@ -278,6 +279,9 @@  static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
 	if (bio == NULL)
 		return -ENOMEM;
 
+	if (blk_queue_pci_p2pdma(rq->q))
+		gup_flags |= FOLL_PCI_P2PDMA;
+
 	while (iov_iter_count(iter)) {
 		struct page **pages, *stack_pages[UIO_FASTIOV];
 		ssize_t bytes;
@@ -286,11 +290,11 @@  static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
 
 		if (nr_vecs <= ARRAY_SIZE(stack_pages)) {
 			pages = stack_pages;
-			bytes = iov_iter_get_pages2(iter, pages, LONG_MAX,
-							nr_vecs, &offs);
+			bytes = iov_iter_get_pages(iter, pages, LONG_MAX,
+						   nr_vecs, &offs, gup_flags);
 		} else {
-			bytes = iov_iter_get_pages_alloc2(iter, &pages,
-							LONG_MAX, &offs);
+			bytes = iov_iter_get_pages_alloc(iter, &pages,
+						LONG_MAX, &offs, gup_flags);
 		}
 		if (unlikely(bytes <= 0)) {
 			ret = bytes ? bytes : -EFAULT;