From: Souptick Joarder <jrdr.linux@gmail.com>
To: akpm@linux-foundation.org, willy@infradead.org, mhocko@suse.com,
kirill.shutemov@linux.intel.com, vbabka@suse.cz,
riel@surriel.com, sfr@canb.auug.org.au, rppt@linux.vnet.ibm.com,
peterz@infradead.org, linux@armlinux.org.uk,
robin.murphy@arm.com, iamjoonsoo.kim@lge.com, treding@nvidia.com,
keescook@chromium.org, m.szyprowski@samsung.com,
stefanr@s5r6.in-berlin.de, hjc@rock-chips.com, heiko@sntech.de,
airlied@linux.ie, oleksandr_andrushchenko@epam.com,
joro@8bytes.org, pawel@osciak.com, kyungmin.park@samsung.com,
mchehab@kernel.org, boris.ostrovsky@oracle.com, jgross@suse.com
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org,
linux1394-devel@lists.sourceforge.net,
dri-devel@lists.freedesktop.org,
linux-rockchip@lists.infradead.org, xen-devel@lists.xen.org,
iommu@lists.linux-foundation.org, linux-media@vger.kernel.org
Subject: [PATCH v2 1/9] mm: Introduce new vm_insert_range API
Date: Sun, 2 Dec 2018 11:49:44 +0530 [thread overview]
Message-ID: <20181202061944.GA3094@jordon-HP-15-Notebook-PC> (raw)
Previouly drivers have their own way of mapping range of
kernel pages/memory into user vma and this was done by
invoking vm_insert_page() within a loop.
As this pattern is common across different drivers, it can
be generalized by creating a new function and use it across
the drivers.
vm_insert_range is the new API which will be used to map a
range of kernel memory/pages to user vma.
This API is tested by Heiko for Rockchip drm driver, on rk3188,
rk3288, rk3328 and rk3399 with graphics.
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Matthew Wilcox <willy@infradead.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
---
include/linux/mm_types.h | 3 +++
mm/memory.c | 38 ++++++++++++++++++++++++++++++++++++++
mm/nommu.c | 7 +++++++
3 files changed, 48 insertions(+)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 5ed8f62..15ae24f 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -523,6 +523,9 @@ extern void tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
extern void tlb_finish_mmu(struct mmu_gather *tlb,
unsigned long start, unsigned long end);
+int vm_insert_range(struct vm_area_struct *vma, unsigned long addr,
+ struct page **pages, unsigned long page_count);
+
static inline void init_tlb_flush_pending(struct mm_struct *mm)
{
atomic_set(&mm->tlb_flush_pending, 0);
diff --git a/mm/memory.c b/mm/memory.c
index 15c417e..84ea46c 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1478,6 +1478,44 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr,
}
/**
+ * vm_insert_range - insert range of kernel pages into user vma
+ * @vma: user vma to map to
+ * @addr: target user address of this page
+ * @pages: pointer to array of source kernel pages
+ * @page_count: number of pages need to insert into user vma
+ *
+ * This allows drivers to insert range of kernel pages they've allocated
+ * into a user vma. This is a generic function which drivers can use
+ * rather than using their own way of mapping range of kernel pages into
+ * user vma.
+ *
+ * If we fail to insert any page into the vma, the function will return
+ * immediately leaving any previously-inserted pages present. Callers
+ * from the mmap handler may immediately return the error as their caller
+ * will destroy the vma, removing any successfully-inserted pages. Other
+ * callers should make their own arrangements for calling unmap_region().
+ *
+ * Context: Process context. Called by mmap handlers.
+ * Return: 0 on success and error code otherwise
+ */
+int vm_insert_range(struct vm_area_struct *vma, unsigned long addr,
+ struct page **pages, unsigned long page_count)
+{
+ unsigned long uaddr = addr;
+ int ret = 0, i;
+
+ for (i = 0; i < page_count; i++) {
+ ret = vm_insert_page(vma, uaddr, pages[i]);
+ if (ret < 0)
+ return ret;
+ uaddr += PAGE_SIZE;
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(vm_insert_range);
+
+/**
* vm_insert_page - insert single page into user vma
* @vma: user vma to map to
* @addr: target user address of this page
diff --git a/mm/nommu.c b/mm/nommu.c
index 749276b..d6ef5c7 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -473,6 +473,13 @@ int vm_insert_page(struct vm_area_struct *vma, unsigned long addr,
}
EXPORT_SYMBOL(vm_insert_page);
+int vm_insert_range(struct vm_area_struct *vma, unsigned long addr,
+ struct page **pages, unsigned long page_count)
+{
+ return -EINVAL;
+}
+EXPORT_SYMBOL(vm_insert_range);
+
/*
* sys_brk() for the most part doesn't need the global kernel
* lock, except when an application is doing something nasty
--
1.9.1
next reply other threads:[~2018-12-02 6:16 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-02 6:19 Souptick Joarder [this message]
2018-12-02 11:13 ` [PATCH v2 1/9] mm: Introduce new vm_insert_range API Mike Rapoport
2018-12-03 4:21 ` Souptick Joarder
2018-12-03 6:22 ` Mike Rapoport
2018-12-04 6:46 ` Souptick Joarder
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20181202061944.GA3094@jordon-HP-15-Notebook-PC \
--to=jrdr.linux@gmail.com \
--cc=airlied@linux.ie \
--cc=akpm@linux-foundation.org \
--cc=boris.ostrovsky@oracle.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=heiko@sntech.de \
--cc=hjc@rock-chips.com \
--cc=iamjoonsoo.kim@lge.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jgross@suse.com \
--cc=joro@8bytes.org \
--cc=keescook@chromium.org \
--cc=kirill.shutemov@linux.intel.com \
--cc=kyungmin.park@samsung.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-rockchip@lists.infradead.org \
--cc=linux1394-devel@lists.sourceforge.net \
--cc=linux@armlinux.org.uk \
--cc=m.szyprowski@samsung.com \
--cc=mchehab@kernel.org \
--cc=mhocko@suse.com \
--cc=oleksandr_andrushchenko@epam.com \
--cc=pawel@osciak.com \
--cc=peterz@infradead.org \
--cc=riel@surriel.com \
--cc=robin.murphy@arm.com \
--cc=rppt@linux.vnet.ibm.com \
--cc=sfr@canb.auug.org.au \
--cc=stefanr@s5r6.in-berlin.de \
--cc=treding@nvidia.com \
--cc=vbabka@suse.cz \
--cc=willy@infradead.org \
--cc=xen-devel@lists.xen.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).