From patchwork Mon Aug 5 06:53:41 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Szyprowski X-Patchwork-Id: 2838546 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 353BD9F3B9 for ; Mon, 5 Aug 2013 06:55:21 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C81FA2017A for ; Mon, 5 Aug 2013 06:55:19 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 141D220165 for ; Mon, 5 Aug 2013 06:55:18 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V6Eh8-0004x1-8t; Mon, 05 Aug 2013 06:55:06 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1V6Eh0-0003g0-RE; Mon, 05 Aug 2013 06:54:58 +0000 Received: from mailout3.samsung.com ([203.254.224.33]) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1V6Egn-0003e7-9u for linux-arm-kernel@lists.infradead.org; Mon, 05 Aug 2013 06:54:47 +0000 Received: from epcpsbgm1.samsung.com (epcpsbgm1 [203.254.230.26]) by mailout3.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0MR100CBMPUM1MD0@mailout3.samsung.com> for linux-arm-kernel@lists.infradead.org; Mon, 05 Aug 2013 15:54:22 +0900 (KST) X-AuditID: cbfee61a-b7f196d000007dfa-c8-51ff4c1e581c Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm1.samsung.com (EPCPMTA) with SMTP id FF.F8.32250.E1C4FF15; Mon, 05 Aug 2013 15:54:22 +0900 (KST) Received: from localhost.localdomain ([106.116.147.30]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0MR1001JGPTNTLG1@mmp1.samsung.com>; Mon, 05 Aug 2013 15:54:22 +0900 (KST) From: Marek Szyprowski To: linux-arm-kernel@lists.infradead.org, linaro-mm-sig@lists.linaro.org, devicetree@vger.kernel.org Subject: [PATCH v4 1/4] drivers: dma-contiguous: clean source code and prepare for device tree Date: Mon, 05 Aug 2013 08:53:41 +0200 Message-id: <1375685624-12103-2-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1375685624-12103-1-git-send-email-m.szyprowski@samsung.com> References: <1375685624-12103-1-git-send-email-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrGLMWRmVeSWpSXmKPExsVy+t9jAV05n/+BBp3ftSz+TjrGbjH/yDlW i1dnNrJZnG16w26xvXMGu8WXKw+ZLDY9vsZqsfbIXXaLDS8PMlksON7CavFnupzFqeuf2Sy+ f/vGZvF3+yYWi8Nv2lkt1s94zeIg4PH71yRGj8t9vUweO2fdZffYvKTe4/a/x8weV040sXqs +/OKyaP/r4FH35ZVjB4/X+p4fN4kF8AdxWWTkpqTWZZapG+XwJUxbY5ewaXIimcTtjI3MN7x 6GLk5JAQMJFYOrGDFcIWk7hwbz1bFyMXh5DAIkaJb0/PMkE47UwS6yZPYQSpYhMwlOh628UG YosIpEnMWLWBBcRmFmhjkXgBYnNwCAskSLz5aQdisgioSsxfUwBSwSvgIfH/TjMzSFhCQEFi ziQbEJNTwFPi5rNMkAohoIoF/SfZJjDyLmBkWMUomlqQXFCclJ5rqFecmFtcmpeul5yfu4kR HNrPpHYwrmywOMQowMGoxMOrwP4/UIg1say4MvcQowQHs5IIL3v/30Ah3pTEyqrUovz4otKc 1OJDjNIcLErivAdarQOFBNITS1KzU1MLUotgskwcnFINjFVp4qvF/8/rNJGu17CZdPhJcIfn abm7S3Oi0hv0V+VIcpbei7Df4qNpZ929QWb16fpGxwID2S6BGfLCaz4K7lT5UPj5B/udzbeS f4bbq7vleE/YPN+lbif/Yt+XN/Jzn63o/dFbrhMqZ7D812o9HwH22cu2lbk4WCi1CfhunrDp /+eZqvmzlViKMxINtZiLihMBwpq0AmkCAAA= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130805_025445_800187_EE814FC0 X-CRM114-Status: GOOD ( 25.08 ) X-Spam-Score: -5.2 (-----) Cc: Laura Abbott , Arnd Bergmann , Tomasz Figa , Nishanth Peethambaran , Michal Nazarewicz , Grant Likely , Marc , Kyungmin Park , Sylwester Nawrocki , Olof Johansson , Sascha Hauer , Marek Szyprowski X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.5 required=5.0 tests=BAYES_00,KHOP_BIG_TO_CC, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch cleans the initialization of dma contiguous framework. The all-in-one dma_declare_contiguous() function is now separated into dma_contiguous_reserve_area() which only steals the the memory from memblock allocator and dma_contiguous_add_device() function, which assigns given device to the specified reserved memory area. This improves the flexibility in defining contiguous memory areas and assigning device to them, because now it is possible to assign more than one device to the given contiguous memory area. Such split in initialization procedure is also required for upcoming device tree support. Signed-off-by: Marek Szyprowski Acked-by: Kyungmin Park --- drivers/base/dma-contiguous.c | 147 +++++++++++++++++----------------- include/asm-generic/dma-contiguous.h | 2 - include/linux/dma-contiguous.h | 49 +++++++++++- 3 files changed, 119 insertions(+), 79 deletions(-) diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c index 0ca5442..2cc9c77 100644 --- a/drivers/base/dma-contiguous.c +++ b/drivers/base/dma-contiguous.c @@ -96,7 +96,7 @@ static inline __maybe_unused phys_addr_t cma_early_percent_memory(void) #endif /** - * dma_contiguous_reserve() - reserve area for contiguous memory handling + * dma_contiguous_reserve() - reserve area(s) for contiguous memory handling * @limit: End address of the reserved memory (optional, 0 for any). * * This function reserves memory from early allocator. It should be @@ -124,22 +124,29 @@ void __init dma_contiguous_reserve(phys_addr_t limit) #endif } - if (selected_size) { + if (selected_size && !dma_contiguous_default_area) { pr_debug("%s: reserving %ld MiB for global area\n", __func__, (unsigned long)selected_size / SZ_1M); - dma_declare_contiguous(NULL, selected_size, 0, limit); + dma_contiguous_reserve_area(selected_size, 0, limit, + &dma_contiguous_default_area); } }; static DEFINE_MUTEX(cma_mutex); -static __init int cma_activate_area(unsigned long base_pfn, unsigned long count) +static __init int cma_activate_area(struct cma *cma) { - unsigned long pfn = base_pfn; - unsigned i = count >> pageblock_order; + int bitmap_size = BITS_TO_LONGS(cma->count) * sizeof(long); + unsigned long base_pfn = cma->base_pfn, pfn = base_pfn; + unsigned i = cma->count >> pageblock_order; struct zone *zone; + cma->bitmap = kzalloc(bitmap_size, GFP_KERNEL); + + if (!cma->bitmap) + return -ENOMEM; + WARN_ON_ONCE(!pfn_valid(pfn)); zone = page_zone(pfn_to_page(pfn)); @@ -153,92 +160,53 @@ static __init int cma_activate_area(unsigned long base_pfn, unsigned long count) } init_cma_reserved_pageblock(pfn_to_page(base_pfn)); } while (--i); - return 0; -} - -static __init struct cma *cma_create_area(unsigned long base_pfn, - unsigned long count) -{ - int bitmap_size = BITS_TO_LONGS(count) * sizeof(long); - struct cma *cma; - int ret = -ENOMEM; - - pr_debug("%s(base %08lx, count %lx)\n", __func__, base_pfn, count); - - cma = kmalloc(sizeof *cma, GFP_KERNEL); - if (!cma) - return ERR_PTR(-ENOMEM); - cma->base_pfn = base_pfn; - cma->count = count; - cma->bitmap = kzalloc(bitmap_size, GFP_KERNEL); - - if (!cma->bitmap) - goto no_mem; - - ret = cma_activate_area(base_pfn, count); - if (ret) - goto error; - - pr_debug("%s: returned %p\n", __func__, (void *)cma); - return cma; - -error: - kfree(cma->bitmap); -no_mem: - kfree(cma); - return ERR_PTR(ret); + return 0; } -static struct cma_reserved { - phys_addr_t start; - unsigned long size; - struct device *dev; -} cma_reserved[MAX_CMA_AREAS] __initdata; -static unsigned cma_reserved_count __initdata; +static struct cma cma_areas[MAX_CMA_AREAS]; +static unsigned cma_area_count; static int __init cma_init_reserved_areas(void) { - struct cma_reserved *r = cma_reserved; - unsigned i = cma_reserved_count; - - pr_debug("%s()\n", __func__); + int i; - for (; i; --i, ++r) { - struct cma *cma; - cma = cma_create_area(PFN_DOWN(r->start), - r->size >> PAGE_SHIFT); - if (!IS_ERR(cma)) - dev_set_cma_area(r->dev, cma); + for (i = 0; i < cma_area_count; i++) { + int ret = cma_activate_area(&cma_areas[i]); + if (ret) + return ret; } + return 0; } core_initcall(cma_init_reserved_areas); /** - * dma_declare_contiguous() - reserve area for contiguous memory handling - * for particular device - * @dev: Pointer to device structure. - * @size: Size of the reserved memory. - * @base: Start address of the reserved memory (optional, 0 for any). + * dma_contiguous_reserve_area() - reserve custom contiguous area + * @size: Size of the reserved area (in bytes), + * @base: Base address of the reserved area optional, use 0 for any * @limit: End address of the reserved memory (optional, 0 for any). + * @res_cma: Pointer to store the created cma region. * - * This function reserves memory for specified device. It should be - * called by board specific code when early allocator (memblock or bootmem) - * is still activate. + * This function reserves memory from early allocator. It should be + * called by arch specific code once the early allocator (memblock or bootmem) + * has been activated and all other subsystems have already allocated/reserved + * memory. This function allows to create custom reserved areas for specific + * devices. */ -int __init dma_declare_contiguous(struct device *dev, phys_addr_t size, - phys_addr_t base, phys_addr_t limit) +int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, + phys_addr_t limit, struct cma **res_cma) { - struct cma_reserved *r = &cma_reserved[cma_reserved_count]; + struct cma *cma = &cma_areas[cma_area_count]; phys_addr_t alignment; + int ret = 0; pr_debug("%s(size %lx, base %08lx, limit %08lx)\n", __func__, (unsigned long)size, (unsigned long)base, (unsigned long)limit); /* Sanity checks */ - if (cma_reserved_count == ARRAY_SIZE(cma_reserved)) { + if (cma_area_count == ARRAY_SIZE(cma_areas)) { pr_err("Not enough slots for CMA reserved regions!\n"); return -ENOSPC; } @@ -256,7 +224,7 @@ int __init dma_declare_contiguous(struct device *dev, phys_addr_t size, if (base) { if (memblock_is_region_reserved(base, size) || memblock_reserve(base, size) < 0) { - base = -EBUSY; + ret = -EBUSY; goto err; } } else { @@ -266,7 +234,7 @@ int __init dma_declare_contiguous(struct device *dev, phys_addr_t size, */ phys_addr_t addr = __memblock_alloc_base(size, alignment, limit); if (!addr) { - base = -ENOMEM; + ret = -ENOMEM; goto err; } else { base = addr; @@ -277,10 +245,11 @@ int __init dma_declare_contiguous(struct device *dev, phys_addr_t size, * Each reserved area must be initialised later, when more kernel * subsystems (like slab allocator) are available. */ - r->start = base; - r->size = size; - r->dev = dev; - cma_reserved_count++; + cma->base_pfn = PFN_DOWN(base); + cma->count = size >> PAGE_SHIFT; + *res_cma = cma; + cma_area_count++; + pr_info("CMA: reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M, (unsigned long)base); @@ -289,9 +258,37 @@ int __init dma_declare_contiguous(struct device *dev, phys_addr_t size, return 0; err: pr_err("CMA: failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M); - return base; + return ret; +} + +/** + * dma_contiguous_add_device() - add device to custom contiguous reserved area + * @dev: Pointer to device structure. + * @cma: Pointer to the cma structure for the reserved area + * + * This function assigns the given device to the contiguous memory area + * reserved earlier by dma_contiguous_reserve_area() function. + */ +int __init dma_contiguous_add_device(struct device *dev, struct cma *cma) +{ + dev_set_cma_area(dev, cma); + return 0; +} + +/** + * dma_contiguous_set_default_area() - set global contiguous reserved area + * @cma: Pointer to the cma structure for the reserved area + * + * This function sets global, device independent contiguous memory area to + * the area created earlier by dma_contiguous_reserve_area() function. + */ +int __init dma_contiguous_set_default_area(struct cma *cma) +{ + dma_contiguous_default_area = cma; + return 0; } + /** * dma_alloc_from_contiguous() - allocate pages from contiguous area * @dev: Pointer to device for which the allocation is performed. diff --git a/include/asm-generic/dma-contiguous.h b/include/asm-generic/dma-contiguous.h index 294b1e7..8979f86 100644 --- a/include/asm-generic/dma-contiguous.h +++ b/include/asm-generic/dma-contiguous.h @@ -18,8 +18,6 @@ static inline void dev_set_cma_area(struct device *dev, struct cma *cma) { if (dev) dev->cma_area = cma; - if (!dev && !dma_contiguous_default_area) - dma_contiguous_default_area = cma; } #endif diff --git a/include/linux/dma-contiguous.h b/include/linux/dma-contiguous.h index 01b5c84..9c807c2 100644 --- a/include/linux/dma-contiguous.h +++ b/include/linux/dma-contiguous.h @@ -68,8 +68,37 @@ struct device; extern struct cma *dma_contiguous_default_area; void dma_contiguous_reserve(phys_addr_t addr_limit); -int dma_declare_contiguous(struct device *dev, phys_addr_t size, - phys_addr_t base, phys_addr_t limit); + +int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, + phys_addr_t limit, struct cma **res_cma); + +int dma_contiguous_add_device(struct device *dev, struct cma *cma); +int dma_contiguous_set_default_area(struct cma *cma); + +/** + * dma_declare_contiguous() - reserve area for contiguous memory handling + * for particular device + * @dev: Pointer to device structure. + * @size: Size of the reserved memory. + * @base: Start address of the reserved memory (optional, 0 for any). + * @limit: End address of the reserved memory (optional, 0 for any). + * + * This function reserves memory for specified device. It should be + * called by board specific code when early allocator (memblock or bootmem) + * is still activate. + */ + +static inline int dma_declare_contiguous(struct device *dev, phys_addr_t size, + phys_addr_t base, phys_addr_t limit) +{ + struct cma *cma; + int ret; + ret = dma_contiguous_reserve_area(size, base, limit, &cma); + if (ret == 0) + dma_contiguous_add_device(dev, cma); + + return ret; +} struct page *dma_alloc_from_contiguous(struct device *dev, int count, unsigned int order); @@ -82,6 +111,22 @@ bool dma_release_from_contiguous(struct device *dev, struct page *pages, static inline void dma_contiguous_reserve(phys_addr_t limit) { } +static inline int dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, + phys_addr_t limit, struct cma **res_cma) { + return -ENOSYS; +} + +static inline int dma_contiguous_add_device(struct device *dev, struct cma *cma) +{ + return -ENOSYS; +} + +static inline int dma_contiguous_set_default_area(struct cma *cma) +{ + return -ENOSYS; +} + + static inline int dma_declare_contiguous(struct device *dev, phys_addr_t size, phys_addr_t base, phys_addr_t limit)