From: Logan Gunthorpe <logang@deltatee.com>
To: Chaitanya Kulkarni <chaitanyak@nvidia.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-mm@kvack.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: Tue, 25 Oct 2022 09:35:20 -0600 [thread overview]
Message-ID: <41e621bb-e836-4a86-e6db-0beed19f5ddc@deltatee.com> (raw)
In-Reply-To: <929ac68b-cf07-8df6-e589-49b0576a50c5@nvidia.com>
On 2022-10-24 19:14, Chaitanya Kulkarni wrote:
> On 10/21/22 10:41, 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)
>> {
>> 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);
> Just one minor question why not make following functions
> EXPORT_SYMBOL_GPL() ?
>
> 1. iov_iter_get_pages2()
> 2. iov_iter_get_pages_alloc2()
They previously were not GPL, so I didn't think that should be changed
in this patch.
Thanks for the review!
Logan
next prev parent reply other threads:[~2022-10-25 15:35 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 [this message]
2022-10-25 15:41 ` Christoph Hellwig
2022-10-27 7:11 ` Jay Fang
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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