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>,
"Christian König" <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>
Subject: [PATCH v9 2/8] iov_iter: introduce iov_iter_get_pages_[alloc_]flags()
Date: Thu, 25 Aug 2022 09:24:19 -0600 [thread overview]
Message-ID: <20220825152425.6296-3-logang@deltatee.com> (raw)
In-Reply-To: <20220825152425.6296-1-logang@deltatee.com>
Add iov_iter_get_pages_flags() and iov_iter_get_pages_alloc_flags()
which take a flags argument that is passed to get_user_pages_fast().
This is so that FOLL_PCI_P2PDMA can be passed when appropriate.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
include/linux/uio.h | 6 ++++++
lib/iov_iter.c | 40 ++++++++++++++++++++++++++++++++++++----
2 files changed, 42 insertions(+), 4 deletions(-)
diff --git a/include/linux/uio.h b/include/linux/uio.h
index 5896af36199c..76ba69edb8c5 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -247,8 +247,14 @@ void iov_iter_pipe(struct iov_iter *i, unsigned int direction, struct pipe_inode
void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count);
void iov_iter_xarray(struct iov_iter *i, unsigned int direction, struct xarray *xarray,
loff_t start, size_t count);
+ssize_t iov_iter_get_pages_flags(struct iov_iter *i, struct page **pages,
+ size_t maxsize, unsigned maxpages, size_t *start,
+ unsigned int gup_flags);
ssize_t iov_iter_get_pages2(struct iov_iter *i, struct page **pages,
size_t maxsize, unsigned maxpages, size_t *start);
+ssize_t iov_iter_get_pages_alloc_flags(struct iov_iter *i,
+ struct page ***pages, size_t maxsize, size_t *start,
+ unsigned int gup_flags);
ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i, struct page ***pages,
size_t maxsize, size_t *start);
int iov_iter_npages(const struct iov_iter *i, int maxpages);
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 4b7fce72e3e5..dedb78f3c655 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -1427,7 +1427,8 @@ static struct page *first_bvec_segment(const struct iov_iter *i,
static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
struct page ***pages, size_t maxsize,
- unsigned int maxpages, size_t *start)
+ unsigned int maxpages, size_t *start,
+ unsigned int gup_flags)
{
unsigned int n;
@@ -1439,7 +1440,6 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
maxsize = MAX_RW_COUNT;
if (likely(user_backed_iter(i))) {
- unsigned int gup_flags = 0;
unsigned long addr;
int res;
@@ -1497,10 +1497,24 @@ ssize_t iov_iter_get_pages2(struct iov_iter *i,
return 0;
BUG_ON(!pages);
- return __iov_iter_get_pages_alloc(i, &pages, maxsize, maxpages, start);
+ return __iov_iter_get_pages_alloc(i, &pages, maxsize, maxpages,
+ start, 0);
}
EXPORT_SYMBOL(iov_iter_get_pages2);
+ssize_t iov_iter_get_pages_flags(struct iov_iter *i, struct page **pages,
+ size_t maxsize, unsigned maxpages, size_t *start,
+ unsigned int gup_flags)
+{
+ if (!maxpages)
+ return 0;
+ BUG_ON(!pages);
+
+ return __iov_iter_get_pages_alloc(i, &pages, maxsize, maxpages,
+ start, gup_flags);
+}
+EXPORT_SYMBOL_GPL(iov_iter_get_pages_flags);
+
ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i,
struct page ***pages, size_t maxsize,
size_t *start)
@@ -1509,7 +1523,7 @@ ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i,
*pages = NULL;
- len = __iov_iter_get_pages_alloc(i, pages, maxsize, ~0U, start);
+ len = __iov_iter_get_pages_alloc(i, pages, maxsize, ~0U, start, 0);
if (len <= 0) {
kvfree(*pages);
*pages = NULL;
@@ -1518,6 +1532,24 @@ ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i,
}
EXPORT_SYMBOL(iov_iter_get_pages_alloc2);
+ssize_t iov_iter_get_pages_alloc_flags(struct iov_iter *i,
+ struct page ***pages, size_t maxsize,
+ size_t *start, unsigned int gup_flags)
+{
+ ssize_t len;
+
+ *pages = NULL;
+
+ len = __iov_iter_get_pages_alloc(i, pages, maxsize, ~0U, start,
+ gup_flags);
+ if (len <= 0) {
+ kvfree(*pages);
+ *pages = NULL;
+ }
+ return len;
+}
+EXPORT_SYMBOL_GPL(iov_iter_get_pages_alloc_flags);
+
size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum,
struct iov_iter *i)
{
--
2.30.2
next prev parent reply other threads:[~2022-08-25 15:24 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-25 15:24 [PATCH v9 0/8] Userspace P2PDMA with O_DIRECT NVMe devices Logan Gunthorpe
2022-08-25 15:24 ` [PATCH v9 1/8] mm: introduce FOLL_PCI_P2PDMA to gate getting PCI P2PDMA pages Logan Gunthorpe
2022-09-05 22:27 ` John Hubbard
2022-08-25 15:24 ` Logan Gunthorpe [this message]
2022-09-05 14:33 ` [PATCH v9 2/8] iov_iter: introduce iov_iter_get_pages_[alloc_]flags() Christoph Hellwig
2022-09-05 23:21 ` John Hubbard
2022-09-06 16:52 ` Logan Gunthorpe
2022-08-25 15:24 ` [PATCH v9 3/8] block: add check when merging zone device pages Logan Gunthorpe
2022-09-05 14:34 ` Christoph Hellwig
2022-09-05 23:58 ` John Hubbard
2022-08-25 15:24 ` [PATCH v9 4/8] lib/scatterlist: " Logan Gunthorpe
2022-09-05 14:34 ` Christoph Hellwig
2022-09-06 0:21 ` John Hubbard
2022-08-25 15:24 ` [PATCH v9 5/8] block: set FOLL_PCI_P2PDMA in __bio_iov_iter_get_pages() Logan Gunthorpe
2022-09-05 14:36 ` Christoph Hellwig
2022-09-06 0:48 ` John Hubbard
2022-08-25 15:24 ` [PATCH v9 6/8] block: set FOLL_PCI_P2PDMA in bio_map_user_iov() Logan Gunthorpe
2022-09-05 14:36 ` Christoph Hellwig
2022-09-06 0:54 ` John Hubbard
2022-08-25 15:24 ` [PATCH v9 7/8] PCI/P2PDMA: Allow userspace VMA allocations through sysfs Logan Gunthorpe
2022-09-01 16:20 ` Greg Kroah-Hartman
2022-09-01 16:32 ` Logan Gunthorpe
2022-09-01 16:42 ` Greg Kroah-Hartman
2022-09-01 18:14 ` Logan Gunthorpe
2022-09-01 18:36 ` Greg Kroah-Hartman
2022-09-01 19:16 ` Logan Gunthorpe
2022-09-02 5:53 ` Greg Kroah-Hartman
2022-09-02 18:46 ` Logan Gunthorpe
2022-09-20 6:46 ` Christoph Hellwig
2022-09-22 8:38 ` Greg Kroah-Hartman
2022-09-22 14:58 ` Logan Gunthorpe
2022-08-25 15:24 ` [PATCH v9 8/8] ABI: sysfs-bus-pci: add documentation for p2pmem allocate Logan Gunthorpe
2022-09-01 16:18 ` Greg Kroah-Hartman
2022-09-01 16:33 ` Logan Gunthorpe
2022-09-06 1:03 ` John Hubbard
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