From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx129.postini.com [74.125.245.129]) by kanga.kvack.org (Postfix) with SMTP id 6A8036B0069 for ; Wed, 29 Aug 2012 02:56:01 -0400 (EDT) From: Hiroshi Doyu Subject: [RFC 1/5] ARM: dma-mapping: New dma_map_ops->iova_get_free_{total,max} functions Date: Wed, 29 Aug 2012 09:55:31 +0300 Message-ID: <1346223335-31455-2-git-send-email-hdoyu@nvidia.com> In-Reply-To: <1346223335-31455-1-git-send-email-hdoyu@nvidia.com> References: <1346223335-31455-1-git-send-email-hdoyu@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: m.szyprowski@samsung.com Cc: iommu@lists.linux-foundation.org, Hiroshi Doyu , linux-arm-kernel@lists.infradead.org, linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kyungmin.park@samsung.com, arnd@arndb.de, linux@arm.linux.org.uk, chunsang.jeong@linaro.org, vdumpa@nvidia.com, subashrp@gmail.com, minchan@kernel.org, pullip.cho@samsung.com, konrad.wilk@oracle.com, linux-tegra@vger.kernel.org ->iova>_get_free_total() returns the sum of available free areas. ->iova>_get_free_max() returns the largest available free area size. Signed-off-by: Hiroshi Doyu --- arch/arm/include/asm/dma-mapping.h | 16 ++++++++++ arch/arm/mm/dma-mapping.c | 54 ++++++++++++++++++++++++++++++++++++ include/linux/dma-mapping.h | 3 ++ 3 files changed, 73 insertions(+), 0 deletions(-) diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index 2300484..1cbd279 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -170,6 +170,22 @@ static inline void dma_free_attrs(struct device *dev, size_t size, ops->free(dev, size, cpu_addr, dma_handle, attrs); } +static inline size_t dma_iova_get_free_total(struct device *dev) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + BUG_ON(!ops); + + return ops->iova_get_free_total(dev); +} + +static inline size_t dma_iova_get_free_max(struct device *dev) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + BUG_ON(!ops); + + return ops->iova_get_free_max(dev); +} + /** * arm_dma_mmap - map a coherent DMA allocation into user space * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c index e4746b7..db17338 100644 --- a/arch/arm/mm/dma-mapping.c +++ b/arch/arm/mm/dma-mapping.c @@ -1001,6 +1001,57 @@ fs_initcall(dma_debug_do_init); /* IOMMU */ +static size_t arm_iommu_iova_get_free_total(struct device *dev) +{ + struct dma_iommu_mapping *mapping = dev->archdata.mapping; + unsigned long flags; + size_t size = 0; + unsigned long start = 0; + + BUG_ON(!dev); + BUG_ON(!mapping); + + spin_lock_irqsave(&mapping->lock, flags); + while (1) { + unsigned long end; + + start = bitmap_find_next_zero_area(mapping->bitmap, + mapping->bits, start, 1, 0); + if (start > mapping->bits) + break; + + end = find_next_bit(mapping->bitmap, mapping->bits, start); + size += end - start; + start = end; + } + spin_unlock_irqrestore(&mapping->lock, flags); + return size << (mapping->order + PAGE_SHIFT); +} + +static size_t arm_iommu_iova_get_free_max(struct device *dev) +{ + struct dma_iommu_mapping *mapping = dev->archdata.mapping; + unsigned long flags; + size_t max_free = 0; + unsigned long start = 0; + + spin_lock_irqsave(&mapping->lock, flags); + while (1) { + unsigned long end; + + start = bitmap_find_next_zero_area(mapping->bitmap, + mapping->bits, start, 1, 0); + if (start > mapping->bits) + break; + + end = find_next_bit(mapping->bitmap, mapping->bits, start); + max_free = max_t(size_t, max_free, end - start); + start = end; + } + spin_unlock_irqrestore(&mapping->lock, flags); + return max_free << (mapping->order + PAGE_SHIFT); +} + static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping, size_t size) { @@ -1721,6 +1772,9 @@ struct dma_map_ops iommu_ops = { .unmap_sg = arm_iommu_unmap_sg, .sync_sg_for_cpu = arm_iommu_sync_sg_for_cpu, .sync_sg_for_device = arm_iommu_sync_sg_for_device, + + .iova_get_free_total = arm_iommu_iova_get_free_total, + .iova_get_free_max = arm_iommu_iova_get_free_max, }; struct dma_map_ops iommu_coherent_ops = { diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 94af418..0337182 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -53,6 +53,9 @@ struct dma_map_ops { #ifdef ARCH_HAS_DMA_GET_REQUIRED_MASK u64 (*get_required_mask)(struct device *dev); #endif + size_t (*iova_get_free_total)(struct device *dev); + size_t (*iova_get_free_max)(struct device *dev); + int is_phys; }; -- 1.7.5.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org