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From:   Logan Gunthorpe <logang@deltatee.com>
To:     linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
        linux-block@vger.kernel.org, linux-pci@vger.kernel.org,
        linux-mm@kvack.org
Cc:     Christoph Hellwig <hch@lst.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Jason Gunthorpe <jgg@ziepe.ca>,
        =?UTF-8?q?Christian=20K=C3=B6nig?= <christian.koenig@amd.com>,
        John Hubbard <jhubbard@nvidia.com>,
        Don Dutile <ddutile@redhat.com>,
        Matthew Wilcox <willy@infradead.org>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Minturn Dave B <dave.b.minturn@intel.com>,
        Jason Ekstrand <jason@jlekstrand.net>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Xiong Jianxin <jianxin.xiong@intel.com>,
        Bjorn Helgaas <helgaas@kernel.org>,
        Ira Weiny <ira.weiny@intel.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Martin Oliveira <martin.oliveira@eideticom.com>,
        Chaitanya Kulkarni <ckulkarnilinux@gmail.com>,
        Ralph Campbell <rcampbell@nvidia.com>,
        Stephen Bates <sbates@raithlin.com>,
        Logan Gunthorpe <logang@deltatee.com>
Date:   Fri, 21 Oct 2022 11:41:14 -0600
Message-Id: <20221021174116.7200-8-logang@deltatee.com>
In-Reply-To: <20221021174116.7200-1-logang@deltatee.com>
References: <20221021174116.7200-1-logang@deltatee.com>
MIME-Version: 1.0
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Subject: [PATCH v11 7/9] block: set FOLL_PCI_P2PDMA in bio_map_user_iov()
Precedence: bulk

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(-)

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;
-- 
2.30.2