From: Jay Fang <f.fangjian@huawei.com>
To: Logan Gunthorpe <logang@deltatee.com>,
<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>
Subject: Re: [PATCH v11 3/9] iov_iter: introduce iov_iter_get_pages_[alloc_]flags()
Date: Thu, 27 Oct 2022 15:11:12 +0800 [thread overview]
Message-ID: <c73c426f-d9f5-2f17-bb88-b72792103703@huawei.com> (raw)
In-Reply-To: <20221021174116.7200-4-logang@deltatee.com>
On 2022/10/22 1:41, Logan Gunthorpe wrote:
> 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>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> ---
> include/linux/uio.h | 6 ++++++
> lib/iov_iter.c | 32 ++++++++++++++++++++++++--------
> 2 files changed, 30 insertions(+), 8 deletions(-)
>
> diff --git a/include/linux/uio.h b/include/linux/uio.h
> index 2e3134b14ffd..9ede533ce64c 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(struct iov_iter *i, struct page **pages,
> + size_t maxsize, unsigned maxpages, size_t *start,
> + unsigned 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(struct iov_iter *i,
> + struct page ***pages, size_t maxsize, size_t *start,
> + unsigned 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 c3ca28ca68a6..53efad017f3c 100644
> --- a/lib/iov_iter.c
> +++ b/lib/iov_iter.c
> @@ -1430,7 +1430,8 @@ 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)
Hi,
found some checkpatch warnings, like this:
WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
#50: FILE: lib/iov_iter.c:1497:
+ size_t *start, unsigned gup_flags)
> {
> unsigned int n;
>
> @@ -1442,7 +1443,6 @@ 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;
>
> @@ -1492,33 +1492,49 @@ static ssize_t __iov_iter_get_pages_alloc(struct iov_iter *i,
> return -EFAULT;
> }
>
> -ssize_t iov_iter_get_pages2(struct iov_iter *i,
> +ssize_t iov_iter_get_pages(struct iov_iter *i,
> struct page **pages, size_t maxsize, unsigned maxpages,
> - size_t *start)
> + size_t *start, unsigned gup_flags)
> {
> if (!maxpages)
> 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, gup_flags);
> +}
> +EXPORT_SYMBOL_GPL(iov_iter_get_pages);
> +
> +ssize_t iov_iter_get_pages2(struct iov_iter *i, struct page **pages,
> + size_t maxsize, unsigned maxpages, size_t *start)
> +{
> + return iov_iter_get_pages(i, pages, maxsize, maxpages, start, 0);
> }
> EXPORT_SYMBOL(iov_iter_get_pages2);
>
> -ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i,
> +ssize_t iov_iter_get_pages_alloc(struct iov_iter *i,
> struct page ***pages, size_t maxsize,
> - size_t *start)
> + size_t *start, unsigned gup_flags)
> {
> ssize_t len;
>
> *pages = NULL;
>
> - len = __iov_iter_get_pages_alloc(i, pages, maxsize, ~0U, start);
> + 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);
> +
> +ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i,
> + struct page ***pages, size_t maxsize, size_t *start)
> +{
> + return iov_iter_get_pages_alloc(i, pages, maxsize, start, 0);
> +}
> EXPORT_SYMBOL(iov_iter_get_pages_alloc2);
>
> size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum,
>
next prev parent reply other threads:[~2022-10-27 7:11 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-21 17:41 [PATCH v11 0/9] Userspace P2PDMA with O_DIRECT NVMe devices Logan Gunthorpe
2022-10-21 17:41 ` [PATCH v11 1/9] mm: allow multiple error returns in try_grab_page() Logan Gunthorpe
2022-10-24 15:00 ` Christoph Hellwig
2022-10-24 16:37 ` Dan Williams
2022-10-25 1:06 ` Chaitanya Kulkarni
2022-10-21 17:41 ` [PATCH v11 2/9] mm: introduce FOLL_PCI_P2PDMA to gate getting PCI P2PDMA pages Logan Gunthorpe
2022-10-24 15:00 ` Christoph Hellwig
2022-10-25 1:09 ` Chaitanya Kulkarni
2022-10-21 17:41 ` [PATCH v11 3/9] iov_iter: introduce iov_iter_get_pages_[alloc_]flags() Logan Gunthorpe
2022-10-25 1:14 ` Chaitanya Kulkarni
2022-10-25 15:35 ` Logan Gunthorpe
2022-10-25 15:41 ` Christoph Hellwig
2022-10-27 7:11 ` Jay Fang [this message]
2022-10-27 14:22 ` Logan Gunthorpe
2022-10-21 17:41 ` [PATCH v11 4/9] block: add check when merging zone device pages Logan Gunthorpe
2022-10-25 1:16 ` Chaitanya Kulkarni
2022-10-21 17:41 ` [PATCH v11 5/9] lib/scatterlist: " Logan Gunthorpe
2022-10-25 1:19 ` Chaitanya Kulkarni
2022-10-21 17:41 ` [PATCH v11 6/9] block: set FOLL_PCI_P2PDMA in __bio_iov_iter_get_pages() Logan Gunthorpe
2022-10-25 1:23 ` Chaitanya Kulkarni
2022-10-25 15:37 ` Logan Gunthorpe
2022-10-25 1:25 ` Chaitanya Kulkarni
2022-10-21 17:41 ` [PATCH v11 7/9] block: set FOLL_PCI_P2PDMA in bio_map_user_iov() Logan Gunthorpe
2022-10-25 1:26 ` Chaitanya Kulkarni
2022-10-21 17:41 ` [PATCH v11 8/9] PCI/P2PDMA: Allow userspace VMA allocations through sysfs Logan Gunthorpe
2022-10-25 1:29 ` Chaitanya Kulkarni
2022-10-25 1:34 ` Chaitanya Kulkarni
2022-10-21 17:41 ` [PATCH v11 9/9] ABI: sysfs-bus-pci: add documentation for p2pmem allocate Logan Gunthorpe
2022-10-25 1:29 ` Chaitanya Kulkarni
2022-10-24 15:03 ` [PATCH v11 0/9] Userspace P2PDMA with O_DIRECT NVMe devices Christoph Hellwig
2022-10-24 19:15 ` John Hubbard
2022-11-08 6:56 ` Christoph Hellwig
2022-11-09 17:28 ` Logan Gunthorpe
2022-11-09 18:33 ` Jens Axboe
2022-11-09 18:44 ` Jens Axboe
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