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| author | Logan Gunthorpe <logang@deltatee.com> | 2022-10-21 19:41:13 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-11-09 19:29:21 +0100 |
| commit | 5e3e3f2e15df46abcab1959f93f214f778b6ec49 (patch) | |
| tree | 6db106f3f6769207fca9f405578c1cfa5e93d12e /block/bio.c | |
| parent | lib/scatterlist: add check when merging zone device pages (diff) | |
| download | linux-5e3e3f2e15df46abcab1959f93f214f778b6ec49.tar.xz linux-5e3e3f2e15df46abcab1959f93f214f778b6ec49.zip | |
block: set FOLL_PCI_P2PDMA in __bio_iov_iter_get_pages()
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 O_DIRECT path in iomap based filesystems
and direct to block devices.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20221021174116.7200-7-logang@deltatee.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/bio.c')
| -rw-r--r-- | block/bio.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/block/bio.c b/block/bio.c index c7a124294828..aa1de6a367f9 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1197,6 +1197,7 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) unsigned short entries_left = bio->bi_max_vecs - bio->bi_vcnt; struct bio_vec *bv = bio->bi_io_vec + bio->bi_vcnt; struct page **pages = (struct page **)bv; + unsigned int gup_flags = 0; ssize_t size, left; unsigned len, i = 0; size_t offset, trim; @@ -1210,6 +1211,9 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) BUILD_BUG_ON(PAGE_PTRS_PER_BVEC < 2); pages += entries_left * (PAGE_PTRS_PER_BVEC - 1); + if (bio->bi_bdev && blk_queue_pci_p2pdma(bio->bi_bdev->bd_disk->queue)) + gup_flags |= FOLL_PCI_P2PDMA; + /* * Each segment in the iov is required to be a block size multiple. * However, we may not be able to get the entire segment if it spans @@ -1217,8 +1221,9 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) * result to ensure the bio's total size is correct. The remainder of * the iov data will be picked up in the next bio iteration. */ - size = iov_iter_get_pages2(iter, pages, UINT_MAX - bio->bi_iter.bi_size, - nr_pages, &offset); + size = iov_iter_get_pages(iter, pages, + UINT_MAX - bio->bi_iter.bi_size, + nr_pages, &offset, gup_flags); if (unlikely(size <= 0)) return size ? size : -EFAULT; |