From patchwork Thu Jan 28 14:58:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12053907 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83D06C433DB for ; Thu, 28 Jan 2021 15:04:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3082964DE0 for ; Thu, 28 Jan 2021 15:04:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232036AbhA1PD7 (ORCPT ); Thu, 28 Jan 2021 10:03:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50352 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231516AbhA1PDy (ORCPT ); Thu, 28 Jan 2021 10:03:54 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6C300C061574; Thu, 28 Jan 2021 07:03:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=C4gwfxOJ/vXre3lN9UufmmjUIasSmHttFaQ+GpK794U=; b=vnSEM1YT0P7LR+hs7ghfNUIsGt ku6MRdfPNokdLFb+04SgPjx1olzrpXB9Yj8lWjZPYZQBoDhA6rMhO0qhcZBe/+WcMSe3ys+XiLibP 8NZUDtbEXGOd6fh6aUlLAKGMJDCaGrZ7Rvkl6Vt+/e1tpt1bVuSQLEbjAYHjTW9MqJTvliQdLWp6V W+eKUZcglbPzzKuq8SlGjftR/XyQsLnPSGkHVFsSl4ajgaj+vnx4dV0U6lw/axDqZtpu6N/vh14uc jzjIYaaxjDUFaHcSnnHpEXrBYTxA7Kw+Lx8p0XaV56ZvGh2Z6rfUVMTJGKPPI2W5qWMcBJWvkto1O KUbbV7TQ==; Received: from 213-225-36-89.nat.highway.a1.net ([213.225.36.89] helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l58p4-008bKj-Tp; Thu, 28 Jan 2021 15:03:04 +0000 From: Christoph Hellwig To: Mauro Carvalho Chehab , Marek Szyprowski , Tomasz Figa , Ricardo Ribalda , Sergey Senozhatsky , iommu@lists.linux-foundation.org Cc: Robin Murphy , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 1/6] dma-mapping: remove the {alloc,free}_noncoherent methods Date: Thu, 28 Jan 2021 15:58:32 +0100 Message-Id: <20210128145837.2250561-2-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210128145837.2250561-1-hch@lst.de> References: <20210128145837.2250561-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org It turns out allowing non-contigous allocations here was a rather bad idea, as we'll now need to define ways to get the pages for mmaping or dma_buf sharing. Revert this change and stick to the original concept. A different API for the use case of non-contigous allocations will be added back later. Signed-off-by: Christoph Hellwig --- Documentation/core-api/dma-api.rst | 64 ++++++++++-------------------- drivers/iommu/dma-iommu.c | 30 -------------- include/linux/dma-map-ops.h | 5 --- include/linux/dma-mapping.h | 17 ++++++-- kernel/dma/mapping.c | 40 ------------------- 5 files changed, 35 insertions(+), 121 deletions(-) diff --git a/Documentation/core-api/dma-api.rst b/Documentation/core-api/dma-api.rst index 75cb757bbff00a..e6d23f117308df 100644 --- a/Documentation/core-api/dma-api.rst +++ b/Documentation/core-api/dma-api.rst @@ -528,16 +528,14 @@ an I/O device, you should not be using this part of the API. :: - void * - dma_alloc_noncoherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, enum dma_data_direction dir, - gfp_t gfp) + struct page * + dma_alloc_pages(struct device *dev, size_t size, dma_addr_t *dma_handle, + enum dma_data_direction dir, gfp_t gfp) -This routine allocates a region of bytes of consistent memory. It -returns a pointer to the allocated region (in the processor's virtual address -space) or NULL if the allocation failed. The returned memory may or may not -be in the kernel direct mapping. Drivers must not call virt_to_page on -the returned memory region. +This routine allocates a region of bytes of non-coherent memory. It +returns a pointer to first struct page for the region, or NULL if the +allocation failed. The resulting struct page can be used for everything a +struct page is suitable for. It also returns a which may be cast to an unsigned integer the same width as the bus and given to the device as the DMA address base of @@ -558,51 +556,33 @@ reused. :: void - dma_free_noncoherent(struct device *dev, size_t size, void *cpu_addr, + dma_free_pages(struct device *dev, size_t size, struct page *page, dma_addr_t dma_handle, enum dma_data_direction dir) -Free a region of memory previously allocated using dma_alloc_noncoherent(). -dev, size and dma_handle and dir must all be the same as those passed into -dma_alloc_noncoherent(). cpu_addr must be the virtual address returned by -dma_alloc_noncoherent(). +Free a region of memory previously allocated using dma_alloc_pages(). +dev, size, dma_handle and dir must all be the same as those passed into +dma_alloc_pages(). page must be the pointer returned by dma_alloc_pages(). :: - struct page * - dma_alloc_pages(struct device *dev, size_t size, dma_addr_t *dma_handle, - enum dma_data_direction dir, gfp_t gfp) - -This routine allocates a region of bytes of non-coherent memory. It -returns a pointer to first struct page for the region, or NULL if the -allocation failed. The resulting struct page can be used for everything a -struct page is suitable for. - -It also returns a which may be cast to an unsigned integer the -same width as the bus and given to the device as the DMA address base of -the region. - -The dir parameter specified if data is read and/or written by the device, -see dma_map_single() for details. - -The gfp parameter allows the caller to specify the ``GFP_`` flags (see -kmalloc()) for the allocation, but rejects flags used to specify a memory -zone such as GFP_DMA or GFP_HIGHMEM. + void * + dma_alloc_noncoherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, + gfp_t gfp) -Before giving the memory to the device, dma_sync_single_for_device() needs -to be called, and before reading memory written by the device, -dma_sync_single_for_cpu(), just like for streaming DMA mappings that are -reused. +This routine is a convenient wrapper around dma_alloc_pages that returns the +kernel virtual address for the allocated memory instead of the page structure. :: void - dma_free_pages(struct device *dev, size_t size, struct page *page, + dma_free_noncoherent(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_handle, enum dma_data_direction dir) -Free a region of memory previously allocated using dma_alloc_pages(). -dev, size and dma_handle and dir must all be the same as those passed into -dma_alloc_noncoherent(). page must be the pointer returned by -dma_alloc_pages(). +Free a region of memory previously allocated using dma_alloc_noncoherent(). +dev, size, dma_handle and dir must all be the same as those passed into +dma_alloc_noncoherent(). cpu_addr must be the virtual address returned by +dma_alloc_noncoherent(). :: diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 4078358ed66ea8..255533faf90599 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1197,34 +1197,6 @@ static void *iommu_dma_alloc(struct device *dev, size_t size, return cpu_addr; } -#ifdef CONFIG_DMA_REMAP -static void *iommu_dma_alloc_noncoherent(struct device *dev, size_t size, - dma_addr_t *handle, enum dma_data_direction dir, gfp_t gfp) -{ - if (!gfpflags_allow_blocking(gfp)) { - struct page *page; - - page = dma_common_alloc_pages(dev, size, handle, dir, gfp); - if (!page) - return NULL; - return page_address(page); - } - - return iommu_dma_alloc_remap(dev, size, handle, gfp | __GFP_ZERO, - PAGE_KERNEL, 0); -} - -static void iommu_dma_free_noncoherent(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t handle, enum dma_data_direction dir) -{ - __iommu_dma_unmap(dev, handle, size); - __iommu_dma_free(dev, size, cpu_addr); -} -#else -#define iommu_dma_alloc_noncoherent NULL -#define iommu_dma_free_noncoherent NULL -#endif /* CONFIG_DMA_REMAP */ - static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs) @@ -1295,8 +1267,6 @@ static const struct dma_map_ops iommu_dma_ops = { .free = iommu_dma_free, .alloc_pages = dma_common_alloc_pages, .free_pages = dma_common_free_pages, - .alloc_noncoherent = iommu_dma_alloc_noncoherent, - .free_noncoherent = iommu_dma_free_noncoherent, .mmap = iommu_dma_mmap, .get_sgtable = iommu_dma_get_sgtable, .map_page = iommu_dma_map_page, diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 70fcd0f610ea48..11e02537b9e01b 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -22,11 +22,6 @@ struct dma_map_ops { gfp_t gfp); void (*free_pages)(struct device *dev, size_t size, struct page *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir); - void *(*alloc_noncoherent)(struct device *dev, size_t size, - dma_addr_t *dma_handle, enum dma_data_direction dir, - gfp_t gfp); - void (*free_noncoherent)(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, enum dma_data_direction dir); int (*mmap)(struct device *, struct vm_area_struct *, void *, dma_addr_t, size_t, unsigned long attrs); diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 2e49996a8f391a..fbfa3f5abd9498 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -263,10 +263,19 @@ struct page *dma_alloc_pages(struct device *dev, size_t size, dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp); void dma_free_pages(struct device *dev, size_t size, struct page *page, dma_addr_t dma_handle, enum dma_data_direction dir); -void *dma_alloc_noncoherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp); -void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, enum dma_data_direction dir); + +static inline void *dma_alloc_noncoherent(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) +{ + struct page *page = dma_alloc_pages(dev, size, dma_handle, dir, gfp); + return page ? page_address(page) : NULL; +} + +static inline void dma_free_noncoherent(struct device *dev, size_t size, + void *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir) +{ + dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir); +} static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr, size_t size, enum dma_data_direction dir, unsigned long attrs) diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index f87a89d086544b..68992e35c8c3a7 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -515,46 +515,6 @@ void dma_free_pages(struct device *dev, size_t size, struct page *page, } EXPORT_SYMBOL_GPL(dma_free_pages); -void *dma_alloc_noncoherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) -{ - const struct dma_map_ops *ops = get_dma_ops(dev); - void *vaddr; - - if (!ops || !ops->alloc_noncoherent) { - struct page *page; - - page = dma_alloc_pages(dev, size, dma_handle, dir, gfp); - if (!page) - return NULL; - return page_address(page); - } - - size = PAGE_ALIGN(size); - vaddr = ops->alloc_noncoherent(dev, size, dma_handle, dir, gfp); - if (vaddr) - debug_dma_map_page(dev, virt_to_page(vaddr), 0, size, dir, - *dma_handle); - return vaddr; -} -EXPORT_SYMBOL_GPL(dma_alloc_noncoherent); - -void dma_free_noncoherent(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, enum dma_data_direction dir) -{ - const struct dma_map_ops *ops = get_dma_ops(dev); - - if (!ops || !ops->free_noncoherent) { - dma_free_pages(dev, size, virt_to_page(vaddr), dma_handle, dir); - return; - } - - size = PAGE_ALIGN(size); - debug_dma_unmap_page(dev, dma_handle, size, dir); - ops->free_noncoherent(dev, size, vaddr, dma_handle, dir); -} -EXPORT_SYMBOL_GPL(dma_free_noncoherent); - int dma_supported(struct device *dev, u64 mask) { const struct dma_map_ops *ops = get_dma_ops(dev); From patchwork Thu Jan 28 14:58:33 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12053911 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0D278C4332B for ; Thu, 28 Jan 2021 15:04:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C0DBF64DFB for ; Thu, 28 Jan 2021 15:04:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232336AbhA1PE3 (ORCPT ); Thu, 28 Jan 2021 10:04:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231875AbhA1PD6 (ORCPT ); Thu, 28 Jan 2021 10:03:58 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 86602C061573; Thu, 28 Jan 2021 07:03:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=V9Mg8tXW0rNlZuOFD1i/bt5R8THD0IcaaC9lFgbmReU=; b=SUDWHoqs/u+HfYA9otWMGiEnmB XnxFdgujo+RxjKGbRnKsCXQ3r6kJh0lKp0nb1nFs6yhwpQ2iBbxeZhQuCy4CA+GMfx81WcdJniwI/ Bz6ozDlsv1lj91VWNuKHd2Wol66E0DBC46C08+kEhS72E640bb5fqwvkLV4iurgENbpi4pgfwfruc irRyGUPUXwaQp5RgAwZYu44Wdyt5G4Zbimr+UoX9l9l7/wQcFBszCYe8Klt7M+jYgY7rroYb4dAO+ RzAGgrTCjnw30P57qAS15oPNe6BLrufJxnB0wcNxQ0AlCl49qaTynGc6Ix+4YzbW73RVhPB8zFcjz evjU9SkQ==; Received: from [2001:4bb8:18c:25a3:5b32:95f:aa1f:ea4] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l58p8-008bKo-Ny; Thu, 28 Jan 2021 15:03:08 +0000 From: Christoph Hellwig To: Mauro Carvalho Chehab , Marek Szyprowski , Tomasz Figa , Ricardo Ribalda , Sergey Senozhatsky , iommu@lists.linux-foundation.org Cc: Robin Murphy , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 2/6] dma-mapping: add a dma_mmap_pages helper Date: Thu, 28 Jan 2021 15:58:33 +0100 Message-Id: <20210128145837.2250561-3-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210128145837.2250561-1-hch@lst.de> References: <20210128145837.2250561-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add a helper to map memory allocated using dma_alloc_pages into a user address space, similar to the dma_alloc_attrs function for coherent allocations. Signed-off-by: Christoph Hellwig --- Documentation/core-api/dma-api.rst | 10 ++++++++++ include/linux/dma-mapping.h | 2 ++ kernel/dma/mapping.c | 13 +++++++++++++ 3 files changed, 25 insertions(+) diff --git a/Documentation/core-api/dma-api.rst b/Documentation/core-api/dma-api.rst index e6d23f117308df..157a474ae54416 100644 --- a/Documentation/core-api/dma-api.rst +++ b/Documentation/core-api/dma-api.rst @@ -563,6 +563,16 @@ Free a region of memory previously allocated using dma_alloc_pages(). dev, size, dma_handle and dir must all be the same as those passed into dma_alloc_pages(). page must be the pointer returned by dma_alloc_pages(). +:: + + int + dma_mmap_pages(struct device *dev, struct vm_area_struct *vma, + size_t size, struct page *page) + +Map an allocation returned from dma_alloc_pages() into a user address space. +dev and size must be the same as those passed into dma_alloc_pages(). +page must be the pointer returned by dma_alloc_pages(). + :: void * diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index fbfa3f5abd9498..4977a748cb9483 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -263,6 +263,8 @@ struct page *dma_alloc_pages(struct device *dev, size_t size, dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp); void dma_free_pages(struct device *dev, size_t size, struct page *page, dma_addr_t dma_handle, enum dma_data_direction dir); +int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma, + size_t size, struct page *page); static inline void *dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 68992e35c8c3a7..c1e515496c067b 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -515,6 +515,19 @@ void dma_free_pages(struct device *dev, size_t size, struct page *page, } EXPORT_SYMBOL_GPL(dma_free_pages); +int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma, + size_t size, struct page *page) +{ + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; + + if (vma->vm_pgoff >= count || vma_pages(vma) > count - vma->vm_pgoff) + return -ENXIO; + return remap_pfn_range(vma, vma->vm_start, + page_to_pfn(page) + vma->vm_pgoff, + vma_pages(vma) << PAGE_SHIFT, vma->vm_page_prot); +} +EXPORT_SYMBOL_GPL(dma_mmap_pages); + int dma_supported(struct device *dev, u64 mask) { const struct dma_map_ops *ops = get_dma_ops(dev); From patchwork Thu Jan 28 14:58:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12053909 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DEDF0C43381 for ; Thu, 28 Jan 2021 15:04:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A5B5B64DF9 for ; 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Received: from [2001:4bb8:18c:25a3:5b32:95f:aa1f:ea4] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l58pC-008bKy-Vy; Thu, 28 Jan 2021 15:03:12 +0000 From: Christoph Hellwig To: Mauro Carvalho Chehab , Marek Szyprowski , Tomasz Figa , Ricardo Ribalda , Sergey Senozhatsky , iommu@lists.linux-foundation.org Cc: Robin Murphy , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 3/6] dma-mapping: add a dma_alloc_noncontiguous API Date: Thu, 28 Jan 2021 15:58:34 +0100 Message-Id: <20210128145837.2250561-4-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210128145837.2250561-1-hch@lst.de> References: <20210128145837.2250561-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add a new API that returns a potentiall virtually non-contigous sg_table and a DMA address. This API is only properly implemented for dma-iommu and will simply return a contigious chunk as a fallback. The intent is that media drivers can use this API if either: - no kernel mapping or only temporary kernel mappings are required. That is as a better replacement for DMA_ATTR_NO_KERNEL_MAPPING - a kernel mapping is required for cached and DMA mapped pages, but the driver also needs the pages to e.g. map them to userspace. In that sense it is a replacement for some aspects of the recently removed and never fully implemented DMA_ATTR_NON_CONSISTENT Signed-off-by: Christoph Hellwig --- Documentation/core-api/dma-api.rst | 72 +++++++++++++++++++++++ include/linux/dma-map-ops.h | 20 +++++++ include/linux/dma-mapping.h | 34 +++++++++++ kernel/dma/mapping.c | 92 ++++++++++++++++++++++++++++++ 4 files changed, 218 insertions(+) diff --git a/Documentation/core-api/dma-api.rst b/Documentation/core-api/dma-api.rst index 157a474ae54416..1dd676a8217137 100644 --- a/Documentation/core-api/dma-api.rst +++ b/Documentation/core-api/dma-api.rst @@ -594,6 +594,78 @@ dev, size, dma_handle and dir must all be the same as those passed into dma_alloc_noncoherent(). cpu_addr must be the virtual address returned by dma_alloc_noncoherent(). +:: + + struct sg_table * + dma_alloc_noncontiguous(struct device *dev, size_t size, + dma_addr_t *dma_handle, + enum dma_data_direction dir, gfp_t gfp) + +This routine allocates bytes of non-coherent and possibly non-contiguous +memory. It returns a pointer to struct sg_table that describes the allocated +memory , or NULL if the allocation failed. The resulting memory can be used for +everything a struct page is suitable for. + +It also returns a which may be cast to an unsigned integer the +same width as the bus and given to the device as the DMA address base of +the region. + +The dir parameter specified if data is read and/or written by the device, +see dma_map_single() for details. + +The gfp parameter allows the caller to specify the ``GFP_`` flags (see +kmalloc()) for the allocation, but rejects flags used to specify a memory +zone such as GFP_DMA or GFP_HIGHMEM. + +Before giving the memory to the device, dma_sync_sgtable_for_device() needs +to be called, and before reading memory written by the device, +dma_sync_sgtable_for_cpu(), just like for streaming DMA mappings that are +reused. + +:: + + void + dma_free_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt, dma_addr_t dma_handle, + enum dma_data_direction dir) + +Free memory previously allocated using dma_alloc_noncontiguous(). dev, size, +dma_handle and dir must all be the same as those passed into +dma_alloc_noncontiguous(). sgt must be the pointer returned by +dma_alloc_noncontiguous(). + +:: + + void * + dma_vmap_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt) + +Return a contiguous kernel mapping for an allocation returned from +dma_alloc_noncontiguous(). dev and size must be the same as those passed into +dma_alloc_noncontiguous(). sgt must be the pointer returned by +dma_alloc_noncontiguous(). + +:: + + void + dma_vunmap_noncontiguous(struct device *dev, void *vaddr) + +Unmap a kernel mapping returned by dma_vmap_noncontiguous(). dev must be the +same the one passed into dma_alloc_noncontiguous(). vaddr must be the pointer +returned by dma_vmap_noncontiguous(). + + +:: + + int + dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma, + size_t size, struct sg_table *sgt) + +Map an allocation returned from dma_alloc_noncontiguous() into a user address +space. dev and size must be the same as those passed into +dma_alloc_noncontiguous(). sgt must be the pointer returned by +dma_alloc_noncontiguous(). + :: int diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 11e02537b9e01b..82efa36d8b09c4 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -22,6 +22,12 @@ struct dma_map_ops { gfp_t gfp); void (*free_pages)(struct device *dev, size_t size, struct page *vaddr, dma_addr_t dma_handle, enum dma_data_direction dir); + struct sg_table *(*alloc_noncontiguous)(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, + gfp_t gfp); + void (*free_noncontiguous)(struct device *dev, size_t size, + struct sg_table *sgt, dma_addr_t dma_handle, + enum dma_data_direction dir); int (*mmap)(struct device *, struct vm_area_struct *, void *, dma_addr_t, size_t, unsigned long attrs); @@ -198,6 +204,20 @@ static inline int dma_mmap_from_global_coherent(struct vm_area_struct *vma, } #endif /* CONFIG_DMA_DECLARE_COHERENT */ +/* + * This is the actual return value from the ->alloc_noncontiguous method. + * The users of the DMA API should only care about the sg_table, but to make + * the DMA-API internal vmaping and freeing easier we stash away the page + * array as well (except for the fallback case). This can go away any time, + * e.g. when a vmap-variant that takes a scatterlist comes along. + */ +struct dma_sgt_handle { + struct sg_table sgt; + struct page **pages; +}; +#define sgt_handle(sgt) \ + container_of((sgt), struct dma_sgt_handle, sgt) + int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs); diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 4977a748cb9483..8694c938e7c271 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -144,6 +144,16 @@ u64 dma_get_required_mask(struct device *dev); size_t dma_max_mapping_size(struct device *dev); bool dma_need_sync(struct device *dev, dma_addr_t dma_addr); unsigned long dma_get_merge_boundary(struct device *dev); +struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp); +void dma_free_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt, dma_addr_t dma_handle, + enum dma_data_direction dir); +void *dma_vmap_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt); +void dma_vunmap_noncontiguous(struct device *dev, void *vaddr); +int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma, + size_t size, struct sg_table *sgt); #else /* CONFIG_HAS_DMA */ static inline dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page, size_t offset, size_t size, @@ -257,6 +267,30 @@ static inline unsigned long dma_get_merge_boundary(struct device *dev) { return 0; } +static inline struct sg_table *dma_alloc_noncontiguous(struct device *dev, + size_t size, dma_addr_t *dma_handle, + enum dma_data_direction dir, gfp_t gfp) +{ + return NULL; +} +static inline void dma_free_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt, dma_addr_t dma_handle, + enum dma_data_direction dir) +{ +} +static inline void *dma_vmap_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt) +{ + return NULL; +} +static inline void dma_vunmap_noncontiguous(struct device *dev, void *vaddr) +{ +} +static inline int dma_mmap_noncontiguous(struct device *dev, + struct vm_area_struct *vma, size_t size, struct sg_table *sgt) +{ + return -EINVAL; +} #endif /* CONFIG_HAS_DMA */ struct page *dma_alloc_pages(struct device *dev, size_t size, diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index c1e515496c067b..d34dfd2ba6e320 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -528,6 +528,98 @@ int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma, } EXPORT_SYMBOL_GPL(dma_mmap_pages); +static struct sg_table *alloc_single_sgt(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) +{ + struct sg_table *sgt; + struct page *page; + + sgt = kmalloc(sizeof(*sgt), gfp); + if (!sgt) + return NULL; + if (sg_alloc_table(sgt, 1, gfp)) + goto out_free_sgt; + page = dma_alloc_pages(dev, size, dma_handle, dir, gfp); + if (!page) + goto out_free_table; + sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); + return sgt; +out_free_table: + sg_free_table(sgt); +out_free_sgt: + kfree(sgt); + return NULL; +} + +static void free_single_sgt(struct device *dev, size_t size, + struct sg_table *sgt, dma_addr_t dma_handle, + enum dma_data_direction dir) +{ + dma_free_pages(dev, size, sg_page(sgt->sgl), dma_handle, dir); + sg_free_table(sgt); + kfree(sgt); +} + +struct sg_table *dma_alloc_noncontiguous(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + + if (!ops || !ops->alloc_noncontiguous) + return alloc_single_sgt(dev, size, dma_handle, dir, gfp); + return ops->alloc_noncontiguous(dev, size, dma_handle, dir, gfp); +} +EXPORT_SYMBOL_GPL(dma_alloc_noncontiguous); + +void dma_free_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt, dma_addr_t dma_handle, + enum dma_data_direction dir) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + + if (!ops || !ops->free_noncontiguous) + free_single_sgt(dev, size, sgt, dma_handle, dir); + else + ops->free_noncontiguous(dev, size, sgt, dma_handle, dir); +} +EXPORT_SYMBOL_GPL(dma_free_noncontiguous); + +void *dma_vmap_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; + + if (!ops || !ops->alloc_noncontiguous) + return page_address(sg_page(sgt->sgl)); + return vmap(sgt_handle(sgt)->pages, count, VM_MAP, PAGE_KERNEL); +} +EXPORT_SYMBOL_GPL(dma_vmap_noncontiguous); + +void dma_vunmap_noncontiguous(struct device *dev, void *vaddr) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + + if (ops && ops->alloc_noncontiguous) + vunmap(vaddr); +} +EXPORT_SYMBOL_GPL(dma_vunmap_noncontiguous); + +int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma, + size_t size, struct sg_table *sgt) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; + + if (!ops || !ops->alloc_noncontiguous) + return dma_mmap_pages(dev, vma, size, sg_page(sgt->sgl)); + + if (vma->vm_pgoff >= count || vma_pages(vma) > count - vma->vm_pgoff) + return -ENXIO; + return vm_map_pages(vma, sgt_handle(sgt)->pages, count); +} +EXPORT_SYMBOL_GPL(dma_mmap_noncontiguous); + int dma_supported(struct device *dev, u64 mask) { const struct dma_map_ops *ops = get_dma_ops(dev); From patchwork Thu Jan 28 14:58:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12053921 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4CE83C433E0 for ; Thu, 28 Jan 2021 15:08:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0ED4564D99 for ; Thu, 28 Jan 2021 15:08:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232409AbhA1PI2 (ORCPT ); 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Received: from [2001:4bb8:18c:25a3:5b32:95f:aa1f:ea4] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l58pG-008bLB-Pa; Thu, 28 Jan 2021 15:03:15 +0000 From: Christoph Hellwig To: Mauro Carvalho Chehab , Marek Szyprowski , Tomasz Figa , Ricardo Ribalda , Sergey Senozhatsky , iommu@lists.linux-foundation.org Cc: Robin Murphy , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 4/6] dma-iommu: refactor iommu_dma_alloc_remap Date: Thu, 28 Jan 2021 15:58:35 +0100 Message-Id: <20210128145837.2250561-5-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210128145837.2250561-1-hch@lst.de> References: <20210128145837.2250561-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Split out a new helper that only allocates a sg_table worth of memory without mapping it into contiguous kernel address space. Signed-off-by: Christoph Hellwig --- drivers/iommu/dma-iommu.c | 66 +++++++++++++++++++++------------------ 1 file changed, 35 insertions(+), 31 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 255533faf90599..65af875ba8495c 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -661,24 +661,13 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev, return pages; } -/** - * iommu_dma_alloc_remap - Allocate and map a buffer contiguous in IOVA space - * @dev: Device to allocate memory for. Must be a real device - * attached to an iommu_dma_domain - * @size: Size of buffer in bytes - * @dma_handle: Out argument for allocated DMA handle - * @gfp: Allocation flags - * @prot: pgprot_t to use for the remapped mapping - * @attrs: DMA attributes for this allocation - * - * If @size is less than PAGE_SIZE, then a full CPU page will be allocated, +/* + * If size is less than PAGE_SIZE, then a full CPU page will be allocated, * but an IOMMU which supports smaller pages might not map the whole thing. - * - * Return: Mapped virtual address, or NULL on failure. */ -static void *iommu_dma_alloc_remap(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp, pgprot_t prot, - unsigned long attrs) +static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev, + size_t size, struct sg_table *sgt, dma_addr_t *dma_handle, + gfp_t gfp, pgprot_t prot, unsigned long attrs) { struct iommu_domain *domain = iommu_get_dma_domain(dev); struct iommu_dma_cookie *cookie = domain->iova_cookie; @@ -687,9 +676,7 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size, int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs); unsigned int count, min_size, alloc_sizes = domain->pgsize_bitmap; struct page **pages; - struct sg_table sgt; dma_addr_t iova; - void *vaddr; *dma_handle = DMA_MAPPING_ERROR; @@ -717,34 +704,26 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size, if (!iova) goto out_free_pages; - if (sg_alloc_table_from_pages(&sgt, pages, count, 0, size, GFP_KERNEL)) + if (sg_alloc_table_from_pages(sgt, pages, count, 0, size, GFP_KERNEL)) goto out_free_iova; if (!(ioprot & IOMMU_CACHE)) { struct scatterlist *sg; int i; - for_each_sg(sgt.sgl, sg, sgt.orig_nents, i) + for_each_sg(sgt->sgl, sg, sgt->orig_nents, i) arch_dma_prep_coherent(sg_page(sg), sg->length); } - if (iommu_map_sg_atomic(domain, iova, sgt.sgl, sgt.orig_nents, ioprot) + if (iommu_map_sg_atomic(domain, iova, sgt->sgl, sgt->orig_nents, ioprot) < size) goto out_free_sg; - vaddr = dma_common_pages_remap(pages, size, prot, - __builtin_return_address(0)); - if (!vaddr) - goto out_unmap; - *dma_handle = iova; - sg_free_table(&sgt); - return vaddr; + return pages; -out_unmap: - __iommu_dma_unmap(dev, iova, size); out_free_sg: - sg_free_table(&sgt); + sg_free_table(sgt); out_free_iova: iommu_dma_free_iova(cookie, iova, size, NULL); out_free_pages: @@ -752,6 +731,31 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size, return NULL; } +static void *iommu_dma_alloc_remap(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, pgprot_t prot, + unsigned long attrs) +{ + struct page **pages; + struct sg_table sgt; + void *vaddr; + + pages = __iommu_dma_alloc_noncontiguous(dev, size, &sgt, dma_handle, + gfp, prot, attrs); + if (!pages) + return NULL; + sg_free_table(&sgt); + vaddr = dma_common_pages_remap(pages, size, prot, + __builtin_return_address(0)); + if (!vaddr) + goto out_unmap; + return vaddr; + +out_unmap: + __iommu_dma_unmap(dev, *dma_handle, size); + __iommu_dma_free_pages(pages, PAGE_ALIGN(size) >> PAGE_SHIFT); + return NULL; +} + static void iommu_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir) { From patchwork Thu Jan 28 14:58:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12053917 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E516CC433DB for ; Thu, 28 Jan 2021 15:07:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B8AD164DFD for ; 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Received: from [2001:4bb8:18c:25a3:5b32:95f:aa1f:ea4] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1l58pK-008bLO-3x; Thu, 28 Jan 2021 15:03:19 +0000 From: Christoph Hellwig To: Mauro Carvalho Chehab , Marek Szyprowski , Tomasz Figa , Ricardo Ribalda , Sergey Senozhatsky , iommu@lists.linux-foundation.org Cc: Robin Murphy , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 5/6] dma-iommu: implement ->alloc_noncontiguous Date: Thu, 28 Jan 2021 15:58:36 +0100 Message-Id: <20210128145837.2250561-6-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210128145837.2250561-1-hch@lst.de> References: <20210128145837.2250561-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Implement support for allocating a non-contiguous DMA region. Signed-off-by: Christoph Hellwig --- drivers/iommu/dma-iommu.c | 47 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 65af875ba8495c..938a2856b4a455 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -756,6 +756,49 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size, return NULL; } +#ifdef CONFIG_DMA_REMAP +static struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev, + size_t size, dma_addr_t *dma_handle, + enum dma_data_direction dir, gfp_t gfp) +{ + unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; + struct dma_sgt_handle *sh; + + sh = kmalloc(sizeof(*sh), gfp); + if (!sh) + return NULL; + + sh->pages = __iommu_dma_alloc_noncontiguous(dev, size, &sh->sgt, + dma_handle, gfp, + PAGE_KERNEL, 0); + if (!sh->pages) + goto out_free_sh; + + if (sg_alloc_table_from_pages(&sh->sgt, sh->pages, count, 0, size, + GFP_KERNEL)) + goto out_free_pages; + + return &sh->sgt; + +out_free_pages: + __iommu_dma_free_pages(sh->pages, count); +out_free_sh: + kfree(sh); + return NULL; +} + +static void iommu_dma_free_noncontiguous(struct device *dev, size_t size, + struct sg_table *sgt, dma_addr_t dma_handle, + enum dma_data_direction dir) +{ + struct dma_sgt_handle *sh = sgt_handle(sgt); + + __iommu_dma_unmap(dev, dma_handle, size); + __iommu_dma_free_pages(sh->pages, PAGE_ALIGN(size) >> PAGE_SHIFT); + sg_free_table(&sh->sgt); +} +#endif /* CONFIG_DMA_REMAP */ + static void iommu_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir) { @@ -1271,6 +1314,10 @@ static const struct dma_map_ops iommu_dma_ops = { .free = iommu_dma_free, .alloc_pages = dma_common_alloc_pages, .free_pages = dma_common_free_pages, +#ifdef CONFIG_DMA_REMAP + .alloc_noncontiguous = iommu_dma_alloc_noncontiguous, + .free_noncontiguous = iommu_dma_free_noncontiguous, +#endif .mmap = iommu_dma_mmap, .get_sgtable = iommu_dma_get_sgtable, .map_page = iommu_dma_map_page, From patchwork Thu Jan 28 14:58:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12053919 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5CEA7C433E0 for ; Thu, 28 Jan 2021 15:07:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1AED364DFB for ; Thu, 28 Jan 2021 15:07:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232135AbhA1PH3 (ORCPT ); Thu, 28 Jan 2021 10:07:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50452 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231127AbhA1PET (ORCPT ); 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Thu, 28 Jan 2021 15:03:26 +0000 From: Christoph Hellwig To: Mauro Carvalho Chehab , Marek Szyprowski , Tomasz Figa , Ricardo Ribalda , Sergey Senozhatsky , iommu@lists.linux-foundation.org Cc: Robin Murphy , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 6/6] media: uvcvideo: Use dma_alloc_noncontiguos API Date: Thu, 28 Jan 2021 15:58:37 +0100 Message-Id: <20210128145837.2250561-7-hch@lst.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210128145837.2250561-1-hch@lst.de> References: <20210128145837.2250561-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Ricardo Ribalda On architectures where the is no coherent caching such as ARM use the dma_alloc_noncontiguos API and handle manually the cache flushing using dma_sync_sgtable(). With this patch on the affected architectures we can measure up to 20x performance improvement in uvc_video_copy_data_work(). Eg: aarch64 with an external usb camera NON_CONTIGUOUS frames: 999 packets: 999 empty: 0 (0 %) errors: 0 invalid: 0 pts: 0 early, 0 initial, 999 ok scr: 0 count ok, 0 diff ok sof: 2048 <= sof <= 0, freq 0.000 kHz bytes 67034480 : duration 33303 FPS: 29.99 URB: 523446/4993 uS/qty: 104.836 avg 132.532 std 13.230 min 831.094 max (uS) header: 76564/4993 uS/qty: 15.334 avg 15.229 std 3.438 min 186.875 max (uS) latency: 468945/4992 uS/qty: 93.939 avg 132.577 std 9.531 min 824.010 max (uS) decode: 54161/4993 uS/qty: 10.847 avg 6.313 std 1.614 min 111.458 max (uS) raw decode speed: 9.931 Gbits/s raw URB handling speed: 1.025 Gbits/s throughput: 16.102 Mbits/s URB decode CPU usage 0.162600 % COHERENT frames: 999 packets: 999 empty: 0 (0 %) errors: 0 invalid: 0 pts: 0 early, 0 initial, 999 ok scr: 0 count ok, 0 diff ok sof: 2048 <= sof <= 0, freq 0.000 kHz bytes 54683536 : duration 33302 FPS: 29.99 URB: 1478135/4000 uS/qty: 369.533 avg 390.357 std 22.968 min 3337.865 max (uS) header: 79761/4000 uS/qty: 19.940 avg 18.495 std 1.875 min 336.719 max (uS) latency: 281077/4000 uS/qty: 70.269 avg 83.102 std 5.104 min 735.000 max (uS) decode: 1197057/4000 uS/qty: 299.264 avg 318.080 std 1.615 min 2806.667 max (uS) raw decode speed: 365.470 Mbits/s raw URB handling speed: 295.986 Mbits/s throughput: 13.136 Mbits/s URB decode CPU usage 3.594500 % Signed-off-by: Ricardo Ribalda Signed-off-by: Christoph Hellwig --- drivers/media/usb/uvc/uvc_video.c | 76 ++++++++++++++++++++++--------- drivers/media/usb/uvc/uvcvideo.h | 4 +- 2 files changed, 57 insertions(+), 23 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index a6a441d92b9488..9c051b55dc7bc6 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -1097,6 +1098,23 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, return data[0]; } +static inline struct device *stream_to_dmadev(struct uvc_streaming *stream) +{ + return bus_to_hcd(stream->dev->udev->bus)->self.sysdev; +} + +static void uvc_urb_dma_sync(struct uvc_urb *uvc_urb, bool for_device) +{ + struct device *dma_dev = dma_dev = stream_to_dmadev(uvc_urb->stream); + + if (for_device) + dma_sync_sgtable_for_device(dma_dev, uvc_urb->sgt, + DMA_FROM_DEVICE); + else + dma_sync_sgtable_for_cpu(dma_dev, uvc_urb->sgt, + DMA_FROM_DEVICE); +} + /* * uvc_video_decode_data_work: Asynchronous memcpy processing * @@ -1118,6 +1136,8 @@ static void uvc_video_copy_data_work(struct work_struct *work) uvc_queue_buffer_release(op->buf); } + uvc_urb_dma_sync(uvc_urb, true); + ret = usb_submit_urb(uvc_urb->urb, GFP_KERNEL); if (ret < 0) uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n", @@ -1539,10 +1559,12 @@ static void uvc_video_complete(struct urb *urb) * Process the URB headers, and optionally queue expensive memcpy tasks * to be deferred to a work queue. */ + uvc_urb_dma_sync(uvc_urb, false); stream->decode(uvc_urb, buf, buf_meta); /* If no async work is needed, resubmit the URB immediately. */ if (!uvc_urb->async_operations) { + uvc_urb_dma_sync(uvc_urb, true); ret = usb_submit_urb(uvc_urb->urb, GFP_ATOMIC); if (ret < 0) uvc_printk(KERN_ERR, @@ -1559,24 +1581,47 @@ static void uvc_video_complete(struct urb *urb) */ static void uvc_free_urb_buffers(struct uvc_streaming *stream) { + struct device *dma_dev = dma_dev = stream_to_dmadev(stream); struct uvc_urb *uvc_urb; for_each_uvc_urb(uvc_urb, stream) { if (!uvc_urb->buffer) continue; -#ifndef CONFIG_DMA_NONCOHERENT - usb_free_coherent(stream->dev->udev, stream->urb_size, - uvc_urb->buffer, uvc_urb->dma); -#else - kfree(uvc_urb->buffer); -#endif + dma_vunmap_noncontiguous(dma_dev, uvc_urb->buffer); + dma_free_noncontiguous(dma_dev, stream->urb_size, uvc_urb->sgt, + uvc_urb->dma, DMA_BIDIRECTIONAL); + uvc_urb->buffer = NULL; } stream->urb_size = 0; } +static bool uvc_alloc_urb_buffer(struct uvc_streaming *stream, + struct uvc_urb *uvc_urb, gfp_t gfp_flags) +{ + struct device *dma_dev = stream_to_dmadev(stream); + + + uvc_urb->sgt = dma_alloc_noncontiguous(dma_dev, stream->urb_size, + &uvc_urb->dma, DMA_BIDIRECTIONAL, + gfp_flags); + if (!uvc_urb->sgt) + return false; + + uvc_urb->buffer = dma_vmap_noncontiguous(dma_dev, stream->urb_size, + uvc_urb->sgt); + if (!uvc_urb->buffer) { + dma_free_noncontiguous(dma_dev, stream->urb_size, + uvc_urb->sgt, uvc_urb->dma, + DMA_BIDIRECTIONAL); + return false; + } + + return true; +} + /* * Allocate transfer buffers. This function can be called with buffers * already allocated when resuming from suspend, in which case it will @@ -1607,19 +1652,11 @@ static int uvc_alloc_urb_buffers(struct uvc_streaming *stream, /* Retry allocations until one succeed. */ for (; npackets > 1; npackets /= 2) { + stream->urb_size = psize * npackets; for (i = 0; i < UVC_URBS; ++i) { struct uvc_urb *uvc_urb = &stream->uvc_urb[i]; - stream->urb_size = psize * npackets; -#ifndef CONFIG_DMA_NONCOHERENT - uvc_urb->buffer = usb_alloc_coherent( - stream->dev->udev, stream->urb_size, - gfp_flags | __GFP_NOWARN, &uvc_urb->dma); -#else - uvc_urb->buffer = - kmalloc(stream->urb_size, gfp_flags | __GFP_NOWARN); -#endif - if (!uvc_urb->buffer) { + if (!uvc_alloc_urb_buffer(stream, uvc_urb, gfp_flags)) { uvc_free_urb_buffers(stream); break; } @@ -1728,12 +1765,8 @@ static int uvc_init_video_isoc(struct uvc_streaming *stream, urb->context = uvc_urb; urb->pipe = usb_rcvisocpipe(stream->dev->udev, ep->desc.bEndpointAddress); -#ifndef CONFIG_DMA_NONCOHERENT urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; urb->transfer_dma = uvc_urb->dma; -#else - urb->transfer_flags = URB_ISO_ASAP; -#endif urb->interval = ep->desc.bInterval; urb->transfer_buffer = uvc_urb->buffer; urb->complete = uvc_video_complete; @@ -1793,10 +1826,8 @@ static int uvc_init_video_bulk(struct uvc_streaming *stream, usb_fill_bulk_urb(urb, stream->dev->udev, pipe, uvc_urb->buffer, size, uvc_video_complete, uvc_urb); -#ifndef CONFIG_DMA_NONCOHERENT urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; urb->transfer_dma = uvc_urb->dma; -#endif uvc_urb->urb = urb; } @@ -1891,6 +1922,7 @@ static int uvc_video_start_transfer(struct uvc_streaming *stream, /* Submit the URBs. */ for_each_uvc_urb(uvc_urb, stream) { + uvc_urb_dma_sync(uvc_urb, true); ret = usb_submit_urb(uvc_urb->urb, gfp_flags); if (ret < 0) { uvc_printk(KERN_ERR, "Failed to submit URB %u (%d).\n", diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index a3dfacf069c44d..a386114bd22999 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -521,7 +521,8 @@ struct uvc_copy_op { * @urb: the URB described by this context structure * @stream: UVC streaming context * @buffer: memory storage for the URB - * @dma: DMA coherent addressing for the urb_buffer + * @dma: Allocated DMA handle + * @sgt: sgt_table with the urb locations in memory * @async_operations: counter to indicate the number of copy operations * @copy_operations: work descriptors for asynchronous copy operations * @work: work queue entry for asynchronous decode @@ -532,6 +533,7 @@ struct uvc_urb { char *buffer; dma_addr_t dma; + struct sg_table *sgt; unsigned int async_operations; struct uvc_copy_op copy_operations[UVC_MAX_PACKETS];