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bh=Oa/SZo4NTYsdsBTx0P4ctAF7OtbSigl9buobaWrjyts=; b=prprWGsHTMpxbcrmzmdVVEJIOccRt/bTPBtmtLv7/gbFh5mv21FjDvJ2WdUPkTfxFL K0ChcbGoWzwnLX3+nyl/omqnLG8Fn4pDrXLqBrim+EgXjnfU1SQRTN4RSA5NaByn6gqD g44rMOQEFh6ROMA+fmzt3ha1I0Np6EooFRMTMJvZgUXYi+3KW2h1IwH925VpW4/rhaOK NP+CMapcpsfl0UmdSCjgCpX9rYRPuVcjbC7ijX3VKi0tTDqwLe50NgaiGFNVCdUHRosK 2vAbiQ2f0BLZpRzHZOh9nZIFhDj7EDFh69OB/2ulGvy3nTqEAcuOg/Ac23qwLLWnPPyw gaHg== X-Gm-Message-State: AA+aEWbvwWyV/y6EQkO7AT9kgKywvvBLZlgaka+NPWsdXTTxGkZ5UTh5 QpgnoBVAr/2Ex2z2B7EeDc0XZ7HX X-Google-Smtp-Source: AFSGD/WuBSuNZ0j2eI+y3vMK44Xcj2c9zc75ftpku5KoTRQQsbR2V1G34l5r5WGKdNdcPvf31x0YxA== X-Received: by 2002:a62:6ec8:: with SMTP id j191mr29584141pfc.198.1544121360370; Thu, 06 Dec 2018 10:36:00 -0800 (PST) Received: from jordon-HP-15-Notebook-PC ([103.227.99.39]) by smtp.gmail.com with ESMTPSA id d129sm1525051pfc.31.2018.12.06.10.35.56 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 06 Dec 2018 10:35:59 -0800 (PST) Date: Fri, 7 Dec 2018 00:09:45 +0530 From: Souptick Joarder 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 Subject: [PATCH v3 1/9] mm: Introduce new vm_insert_range API Message-ID: <20181206183945.GA20932@jordon-HP-15-Notebook-PC> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181206_103611_292696_AE153967 X-CRM114-Status: GOOD ( 16.10 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, xen-devel@lists.xen.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, linux1394-devel@lists.sourceforge.net, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Reviewed-by: Matthew Wilcox Reviewed-by: Mike Rapoport Tested-by: Heiko Stuebner Reviewed-by: Mauro Carvalho Chehab --- include/linux/mm.h | 2 ++ mm/memory.c | 38 ++++++++++++++++++++++++++++++++++++++ mm/nommu.c | 7 +++++++ 3 files changed, 47 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index fcf9cc9..2bc399f 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2506,6 +2506,8 @@ unsigned long change_prot_numa(struct vm_area_struct *vma, int remap_pfn_range(struct vm_area_struct *, unsigned long addr, unsigned long pfn, unsigned long size, pgprot_t); int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); +int vm_insert_range(struct vm_area_struct *vma, unsigned long addr, + struct page **pages, unsigned long page_count); vm_fault_t vmf_insert_pfn(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn); vm_fault_t vmf_insert_pfn_prot(struct vm_area_struct *vma, unsigned long addr, 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