From patchwork Mon Jun 16 05:40:44 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joonsoo Kim X-Patchwork-Id: 359931 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 78FA61400D6 for ; Mon, 16 Jun 2014 15:37:37 +1000 (EST) Received: from ozlabs.org (ozlabs.org [103.22.144.67]) by lists.ozlabs.org (Postfix) with ESMTP id 66DE11A03E7 for ; Mon, 16 Jun 2014 15:37:37 +1000 (EST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from lgeamrelo01.lge.com (lgeamrelo01.lge.com [156.147.1.125]) by lists.ozlabs.org (Postfix) with ESMTP id 29C191A036D for ; Mon, 16 Jun 2014 15:36:41 +1000 (EST) Received: from unknown (HELO js1304-P5Q-DELUXE.LGE.NET) (10.177.220.145) by 156.147.1.125 with ESMTP; 16 Jun 2014 14:36:40 +0900 X-Original-SENDERIP: 10.177.220.145 X-Original-MAILFROM: iamjoonsoo.kim@lge.com From: Joonsoo Kim To: Andrew Morton , "Aneesh Kumar K.V" , Marek Szyprowski , Michal Nazarewicz Subject: [PATCH v3 -next 2/9] DMA, CMA: separate core CMA management codes from DMA APIs Date: Mon, 16 Jun 2014 14:40:44 +0900 Message-Id: <1402897251-23639-3-git-send-email-iamjoonsoo.kim@lge.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1402897251-23639-1-git-send-email-iamjoonsoo.kim@lge.com> References: <1402897251-23639-1-git-send-email-iamjoonsoo.kim@lge.com> Cc: Russell King - ARM Linux , kvm@vger.kernel.org, linux-mm@kvack.org, Gleb Natapov , Greg Kroah-Hartman , Alexander Graf , kvm-ppc@vger.kernel.org, linux-kernel@vger.kernel.org, Minchan Kim , Paul Mackerras , Paolo Bonzini , Joonsoo Kim , Zhang Yanfei , linuxppc-dev@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.16 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" To prepare future generalization work on CMA area management code, we need to separate core CMA management codes from DMA APIs. We will extend these core functions to cover requirements of PPC KVM's CMA area management functionality in following patches. This separation helps us not to touch DMA APIs while extending core functions. v3: move decriptions to exporeted APIs (Minchan) pass aligned base and size to dma_contiguous_early_fixup() (Minchan) Acked-by: Michal Nazarewicz Reviewed-by: Aneesh Kumar K.V Signed-off-by: Joonsoo Kim diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c index 6467c91..9021762 100644 --- a/drivers/base/dma-contiguous.c +++ b/drivers/base/dma-contiguous.c @@ -213,26 +213,9 @@ static int __init cma_init_reserved_areas(void) } core_initcall(cma_init_reserved_areas); -/** - * 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. - * @fixed: hint about where to place the reserved area - * - * 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. - * - * If @fixed is true, reserve contiguous area at exactly @base. If false, - * reserve in range from @base to @limit. - */ -int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, - phys_addr_t limit, struct cma **res_cma, - bool fixed) +static int __init __dma_contiguous_reserve_area(phys_addr_t size, + phys_addr_t base, phys_addr_t limit, + struct cma **res_cma, bool fixed) { struct cma *cma = &cma_areas[cma_area_count]; phys_addr_t alignment; @@ -286,15 +269,47 @@ int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, pr_info("CMA: reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M, (unsigned long)base); - - /* Architecture specific contiguous memory fixup. */ - dma_contiguous_early_fixup(base, size); return 0; + err: pr_err("CMA: failed to reserve %ld MiB\n", (unsigned long)size / SZ_1M); return ret; } +/** + * 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. + * @fixed: hint about where to place the reserved area + * + * 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. + * + * If @fixed is true, reserve contiguous area at exactly @base. If false, + * reserve in range from @base to @limit. + */ +int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base, + phys_addr_t limit, struct cma **res_cma, + bool fixed) +{ + int ret; + + ret = __dma_contiguous_reserve_area(size, base, limit, res_cma, fixed); + if (ret) + return ret; + + /* Architecture specific contiguous memory fixup. */ + dma_contiguous_early_fixup(PFN_PHYS((*res_cma)->base_pfn), + (*res_cma)->count << PAGE_SHIFT); + + return 0; +} + static void clear_cma_bitmap(struct cma *cma, unsigned long pfn, int count) { mutex_lock(&cma->lock); @@ -302,31 +317,16 @@ static void clear_cma_bitmap(struct cma *cma, unsigned long pfn, int count) mutex_unlock(&cma->lock); } -/** - * dma_alloc_from_contiguous() - allocate pages from contiguous area - * @dev: Pointer to device for which the allocation is performed. - * @count: Requested number of pages. - * @align: Requested alignment of pages (in PAGE_SIZE order). - * - * This function allocates memory buffer for specified device. It uses - * device specific contiguous memory area if available or the default - * global one. Requires architecture specific dev_get_cma_area() helper - * function. - */ -struct page *dma_alloc_from_contiguous(struct device *dev, int count, +static struct page *__dma_alloc_from_contiguous(struct cma *cma, int count, unsigned int align) { unsigned long mask, pfn, pageno, start = 0; - struct cma *cma = dev_get_cma_area(dev); struct page *page = NULL; int ret; if (!cma || !cma->count) return NULL; - if (align > CONFIG_CMA_ALIGNMENT) - align = CONFIG_CMA_ALIGNMENT; - pr_debug("%s(cma %p, count %d, align %d)\n", __func__, (void *)cma, count, align); @@ -375,19 +375,30 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count, } /** - * dma_release_from_contiguous() - release allocated pages - * @dev: Pointer to device for which the pages were allocated. - * @pages: Allocated pages. - * @count: Number of allocated pages. + * dma_alloc_from_contiguous() - allocate pages from contiguous area + * @dev: Pointer to device for which the allocation is performed. + * @count: Requested number of pages. + * @align: Requested alignment of pages (in PAGE_SIZE order). * - * This function releases memory allocated by dma_alloc_from_contiguous(). - * It returns false when provided pages do not belong to contiguous area and - * true otherwise. + * This function allocates memory buffer for specified device. It uses + * device specific contiguous memory area if available or the default + * global one. Requires architecture specific dev_get_cma_area() helper + * function. */ -bool dma_release_from_contiguous(struct device *dev, struct page *pages, - int count) +struct page *dma_alloc_from_contiguous(struct device *dev, int count, + unsigned int align) { struct cma *cma = dev_get_cma_area(dev); + + if (align > CONFIG_CMA_ALIGNMENT) + align = CONFIG_CMA_ALIGNMENT; + + return __dma_alloc_from_contiguous(cma, count, align); +} + +static bool __dma_release_from_contiguous(struct cma *cma, struct page *pages, + int count) +{ unsigned long pfn; if (!cma || !pages) @@ -407,3 +418,21 @@ bool dma_release_from_contiguous(struct device *dev, struct page *pages, return true; } + +/** + * dma_release_from_contiguous() - release allocated pages + * @dev: Pointer to device for which the pages were allocated. + * @pages: Allocated pages. + * @count: Number of allocated pages. + * + * This function releases memory allocated by dma_alloc_from_contiguous(). + * It returns false when provided pages do not belong to contiguous area and + * true otherwise. + */ +bool dma_release_from_contiguous(struct device *dev, struct page *pages, + int count) +{ + struct cma *cma = dev_get_cma_area(dev); + + return __dma_release_from_contiguous(cma, pages, count); +}