[10/12] dma-mapping: simplify allocations from per-device coherent memory

Message ID	20190211133554.30055-11-hch@lst.de (mailing list archive)
State	Not Applicable
Headers	show Return-Path: <linux-mips-owner@kernel.org> From: Christoph Hellwig <hch@lst.de> To: iommu@lists.linux-foundation.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Lee Jones <lee.jones@linaro.org>, x86@kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-sh@vger.kernel.org, linux-xtensa@linux-xtensa.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 10/12] dma-mapping: simplify allocations from per-device coherent memory Date: Mon, 11 Feb 2019 14:35:52 +0100 Message-Id: <20190211133554.30055-11-hch@lst.de> In-Reply-To: <20190211133554.30055-1-hch@lst.de> References: <20190211133554.30055-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-mips-owner@vger.kernel.org Precedence: bulk
Series	[01/12] mfd/sm501: depend on HAS_DMA \| expand [01/12] mfd/sm501: depend on HAS_DMA [02/12] device.h: dma_mem is only needed for HAVE_GENERIC_DMA_COHERENT [03/12] of: mark early_init_dt_alloc_reserved_memory_arch static [04/12] of: select OF_RESERVED_MEM automatically [05/12] dma-mapping: remove an incorrect __iommem annotation [06/12] dma-mapping: improve selection of dma_declare_coherent availability [07/12] dma-mapping: move CONFIG_DMA_CMA to kernel/dma/Kconfig [08/12] dma-mapping: remove dma_mark_declared_memory_occupied [09/12] dma-mapping: remove the DMA_MEMORY_EXCLUSIVE flag [10/12] dma-mapping: simplify allocations from per-device coherent memory [11/12] dma-mapping: handle per-device coherent memory mmap in common code [12/12] dma-mapping: remove dma_assign_coherent_memory

diff --git a/arch/arm/mm/dma-mapping-nommu.c b/arch/arm/mm/dma-mapping-nommu.c index f304b10e23a4..c72f024f1e82 100644 --- a/arch/arm/mm/dma-mapping-nommu.c +++ b/arch/arm/mm/dma-mapping-nommu.c @@ -70,16 +70,10 @@ static void arm_nommu_dma_free(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs) { - if (attrs & DMA_ATTR_NON_CONSISTENT) { + if (attrs & DMA_ATTR_NON_CONSISTENT) dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs); - } else { - int ret = dma_release_from_global_coherent(get_order(size), - cpu_addr); - - WARN_ON_ONCE(ret == 0); - } - - return; + else + dma_release_from_global_coherent(size, cpu_addr); } static int arm_nommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index b12fba725f19..018e37a0870e 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -158,30 +158,24 @@ static inline int is_device_dma_capable(struct device *dev) * These three functions are only for dma allocator. * Don't use them in device drivers. */ -int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size, - dma_addr_t *dma_handle, void **ret); -int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr); - int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, size_t size, int *ret); -void *dma_alloc_from_global_coherent(ssize_t size, dma_addr_t *dma_handle); -int dma_release_from_global_coherent(int order, void *vaddr); +void *dma_alloc_from_global_coherent(size_t size, dma_addr_t *dma_handle); +void dma_release_from_global_coherent(size_t size, void *vaddr); int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr, size_t size, int *ret); #else -#define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0) -#define dma_release_from_dev_coherent(dev, order, vaddr) (0) #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0) -static inline void *dma_alloc_from_global_coherent(ssize_t size, +static inline void *dma_alloc_from_global_coherent(size_t size, dma_addr_t *dma_handle) { return NULL; } -static inline int dma_release_from_global_coherent(int order, void *vaddr) +static inline void dma_release_from_global_coherent(size_t size, void *vaddr) { return 0; } diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index 29fd6590dc1e..d1da1048e470 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -8,6 +8,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/dma-mapping.h> +#include "internal.h" struct dma_coherent_mem { void *virt_base; @@ -21,13 +22,6 @@ struct dma_coherent_mem { static struct dma_coherent_mem *dma_coherent_default_memory __ro_after_init; -static inline struct dma_coherent_mem *dev_get_coherent_memory(struct device *dev) -{ - if (dev && dev->dma_mem) - return dev->dma_mem; - return NULL; -} - static inline dma_addr_t dma_get_device_base(struct device *dev, struct dma_coherent_mem * mem) { @@ -135,8 +129,8 @@ void dma_release_declared_memory(struct device *dev) } EXPORT_SYMBOL(dma_release_declared_memory); -static void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem, - ssize_t size, dma_addr_t *dma_handle) +void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem, size_t size, + dma_addr_t *dma_handle) { int order = get_order(size); unsigned long flags; @@ -165,33 +159,7 @@ static void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem, return NULL; } -/** - * dma_alloc_from_dev_coherent() - allocate memory from device coherent pool - * @dev: device from which we allocate memory - * @size: size of requested memory area - * @dma_handle: This will be filled with the correct dma handle - * @ret: This pointer will be filled with the virtual address - * to allocated area. - * - * This function should be only called from per-arch dma_alloc_coherent() - * to support allocation from per-device coherent memory pools. - * - * Returns 0 if dma_alloc_coherent should continue with allocating from - * generic memory areas, or !0 if dma_alloc_coherent should return @ret. - */ -int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size, - dma_addr_t *dma_handle, void **ret) -{ - struct dma_coherent_mem *mem = dev_get_coherent_memory(dev); - - if (!mem) - return 0; - - *ret = __dma_alloc_from_coherent(mem, size, dma_handle); - return 1; -} - -void *dma_alloc_from_global_coherent(ssize_t size, dma_addr_t *dma_handle) +void *dma_alloc_from_global_coherent(size_t size, dma_addr_t *dma_handle) { if (!dma_coherent_default_memory) return NULL; @@ -200,48 +168,33 @@ void *dma_alloc_from_global_coherent(ssize_t size, dma_addr_t *dma_handle) dma_handle); } -static int __dma_release_from_coherent(struct dma_coherent_mem *mem, - int order, void *vaddr) +static bool dma_in_coherent_range(struct dma_coherent_mem *mem, size_t size, + void *vaddr) { - if (mem && vaddr >= mem->virt_base && vaddr < - (mem->virt_base + (mem->size << PAGE_SHIFT))) { - int page = (vaddr - mem->virt_base) >> PAGE_SHIFT; - unsigned long flags; - - spin_lock_irqsave(&mem->spinlock, flags); - bitmap_release_region(mem->bitmap, page, order); - spin_unlock_irqrestore(&mem->spinlock, flags); - return 1; - } - return 0; + return vaddr >= mem->virt_base && + vaddr + size <= mem->virt_base + (mem->size << PAGE_SHIFT); } -/** - * dma_release_from_dev_coherent() - free memory to device coherent memory pool - * @dev: device from which the memory was allocated - * @order: the order of pages allocated - * @vaddr: virtual address of allocated pages - * - * This checks whether the memory was allocated from the per-device - * coherent memory pool and if so, releases that memory. - * - * Returns 1 if we correctly released the memory, or 0 if the caller should - * proceed with releasing memory from generic pools. - */ -int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr) +void __dma_release_from_coherent(struct dma_coherent_mem *mem, size_t size, + void *vaddr) { - struct dma_coherent_mem *mem = dev_get_coherent_memory(dev); + int page = (vaddr - mem->virt_base) >> PAGE_SHIFT; + unsigned long flags; + + if (WARN_ON_ONCE(!dma_in_coherent_range(mem, size, vaddr))) + return; - return __dma_release_from_coherent(mem, order, vaddr); + spin_lock_irqsave(&mem->spinlock, flags); + bitmap_release_region(mem->bitmap, page, get_order(size)); + spin_unlock_irqrestore(&mem->spinlock, flags); } -int dma_release_from_global_coherent(int order, void *vaddr) +void dma_release_from_global_coherent(size_t size, void *vaddr) { if (!dma_coherent_default_memory) - return 0; + return; - return __dma_release_from_coherent(dma_coherent_default_memory, order, - vaddr); + __dma_release_from_coherent(dma_coherent_default_memory, size, vaddr); } static int __dma_mmap_from_coherent(struct dma_coherent_mem *mem, diff --git a/kernel/dma/internal.h b/kernel/dma/internal.h new file mode 100644 index 000000000000..48a0a71487b1 --- /dev/null +++ b/kernel/dma/internal.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _DMA_INTERNAL_H +#define _DMA_INTERNAL_H + +static inline struct dma_coherent_mem *dev_get_coherent_memory(struct device *dev) +{ +#ifdef DMA_DECLARE_COHERENT + if (dev && dev->dma_mem) + return dev->dma_mem; +#endif + return NULL; +} + +void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem, size_t size, + dma_addr_t *dma_handle); +void __dma_release_from_coherent(struct dma_coherent_mem *mem, size_t size, + void *vaddr); + +#endif /* _DMA_INTERNAL_H */ diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index a11006b6d8e8..d3c4363b2143 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -14,6 +14,7 @@ #include <linux/of_device.h> #include <linux/slab.h> #include <linux/vmalloc.h> +#include "internal.h" /* * Managed DMA API @@ -248,12 +249,13 @@ void *dma_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t flag, unsigned long attrs) { const struct dma_map_ops *ops = get_dma_ops(dev); + struct dma_coherent_mem *mem = dev_get_coherent_memory(dev); void *cpu_addr; WARN_ON_ONCE(dev && !dev->coherent_dma_mask); - if (dma_alloc_from_dev_coherent(dev, size, dma_handle, &cpu_addr)) - return cpu_addr; + if (mem) + return __dma_alloc_from_coherent(mem, size, dma_handle); /* let the implementation decide on the zone to allocate from: */ flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM); @@ -277,9 +279,11 @@ void dma_free_attrs(struct device *dev, size_t size, void *cpu_addr, dma_addr_t dma_handle, unsigned long attrs) { const struct dma_map_ops *ops = get_dma_ops(dev); + struct dma_coherent_mem *mem = dev_get_coherent_memory(dev); + + if (mem) + return __dma_release_from_coherent(mem, size, cpu_addr); - if (dma_release_from_dev_coherent(dev, get_order(size), cpu_addr)) - return; /* * On non-coherent platforms which implement DMA-coherent buffers via * non-cacheable remaps, ops->free() may call vunmap(). Thus getting

[10/12] dma-mapping: simplify allocations from per-device coherent memory

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