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authorLogan Gunthorpe <logang@deltatee.com>2022-10-21 11:41:14 -0600
committerJens Axboe <axboe@kernel.dk>2022-11-09 11:29:21 -0700
commit7ee4ccf57484d260c37b29f9a48b65c4101403e8 (patch)
treeeb0e528d232f461d2521e0e1c17b265677751d47 /block
parent5e3e3f2e15df46abcab1959f93f214f778b6ec49 (diff)
block: set FOLL_PCI_P2PDMA in bio_map_user_iov()
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> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Link: https://lore.kernel.org/r/20221021174116.7200-8-logang@deltatee.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-map.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/block/blk-map.c b/block/blk-map.c
index 46688e70b141..19940c978c73 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;