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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-06 19:20:54 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-06 19:20:54 -0700 |
commit | f72e24a1240b78f421649c4d88f5c24ab1c896a1 (patch) | |
tree | 90bed3bf33ae0abf5636dafcc3eda3cc354612b0 /drivers/base | |
parent | 2c669275dc3245e2866a0eea15bda8ec8d1ab8db (diff) | |
parent | 1655cf8829d82d367d8fdb5cb58e5885d7d2a391 (diff) | |
download | linux-f72e24a1240b78f421649c4d88f5c24ab1c896a1.tar.gz linux-f72e24a1240b78f421649c4d88f5c24ab1c896a1.tar.bz2 linux-f72e24a1240b78f421649c4d88f5c24ab1c896a1.zip |
Merge tag 'dma-mapping-4.13' of git://git.infradead.org/users/hch/dma-mapping
Pull dma-mapping infrastructure from Christoph Hellwig:
"This is the first pull request for the new dma-mapping subsystem
In this new subsystem we'll try to properly maintain all the generic
code related to dma-mapping, and will further consolidate arch code
into common helpers.
This pull request contains:
- removal of the DMA_ERROR_CODE macro, replacing it with calls to
->mapping_error so that the dma_map_ops instances are more self
contained and can be shared across architectures (me)
- removal of the ->set_dma_mask method, which duplicates the
->dma_capable one in terms of functionality, but requires more
duplicate code.
- various updates for the coherent dma pool and related arm code
(Vladimir)
- various smaller cleanups (me)"
* tag 'dma-mapping-4.13' of git://git.infradead.org/users/hch/dma-mapping: (56 commits)
ARM: dma-mapping: Remove traces of NOMMU code
ARM: NOMMU: Set ARM_DMA_MEM_BUFFERABLE for M-class cpus
ARM: NOMMU: Introduce dma operations for noMMU
drivers: dma-mapping: allow dma_common_mmap() for NOMMU
drivers: dma-coherent: Introduce default DMA pool
drivers: dma-coherent: Account dma_pfn_offset when used with device tree
dma: Take into account dma_pfn_offset
dma-mapping: replace dmam_alloc_noncoherent with dmam_alloc_attrs
dma-mapping: remove dmam_free_noncoherent
crypto: qat - avoid an uninitialized variable warning
au1100fb: remove a bogus dma_free_nonconsistent call
MAINTAINERS: add entry for dma mapping helpers
powerpc: merge __dma_set_mask into dma_set_mask
dma-mapping: remove the set_dma_mask method
powerpc/cell: use the dma_supported method for ops switching
powerpc/cell: clean up fixed mapping dma_ops initialization
tile: remove dma_supported and mapping_error methods
xen-swiotlb: remove xen_swiotlb_set_dma_mask
arm: implement ->dma_supported instead of ->set_dma_mask
mips/loongson64: implement ->dma_supported instead of ->set_dma_mask
...
Diffstat (limited to 'drivers/base')
-rw-r--r-- | drivers/base/dma-coherent.c | 74 | ||||
-rw-r--r-- | drivers/base/dma-mapping.c | 60 |
2 files changed, 83 insertions, 51 deletions
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c index 640a7e63c453..2ae24c28e70c 100644 --- a/drivers/base/dma-coherent.c +++ b/drivers/base/dma-coherent.c @@ -16,8 +16,27 @@ struct dma_coherent_mem { int flags; unsigned long *bitmap; spinlock_t spinlock; + bool use_dev_dma_pfn_offset; }; +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 dma_coherent_default_memory; +} + +static inline dma_addr_t dma_get_device_base(struct device *dev, + struct dma_coherent_mem * mem) +{ + if (mem->use_dev_dma_pfn_offset) + return (mem->pfn_base - dev->dma_pfn_offset) << PAGE_SHIFT; + else + return mem->device_base; +} + static bool dma_init_coherent_memory( phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags, struct dma_coherent_mem **mem) @@ -83,6 +102,9 @@ static void dma_release_coherent_memory(struct dma_coherent_mem *mem) static int dma_assign_coherent_memory(struct device *dev, struct dma_coherent_mem *mem) { + if (!dev) + return -ENODEV; + if (dev->dma_mem) return -EBUSY; @@ -133,7 +155,7 @@ void *dma_mark_declared_memory_occupied(struct device *dev, return ERR_PTR(-EINVAL); spin_lock_irqsave(&mem->spinlock, flags); - pos = (device_addr - mem->device_base) >> PAGE_SHIFT; + pos = PFN_DOWN(device_addr - dma_get_device_base(dev, mem)); err = bitmap_allocate_region(mem->bitmap, pos, get_order(size)); spin_unlock_irqrestore(&mem->spinlock, flags); @@ -161,15 +183,12 @@ EXPORT_SYMBOL(dma_mark_declared_memory_occupied); int dma_alloc_from_coherent(struct device *dev, ssize_t size, dma_addr_t *dma_handle, void **ret) { - struct dma_coherent_mem *mem; + struct dma_coherent_mem *mem = dev_get_coherent_memory(dev); int order = get_order(size); unsigned long flags; int pageno; int dma_memory_map; - if (!dev) - return 0; - mem = dev->dma_mem; if (!mem) return 0; @@ -186,7 +205,7 @@ int dma_alloc_from_coherent(struct device *dev, ssize_t size, /* * Memory was found in the per-device area. */ - *dma_handle = mem->device_base + (pageno << PAGE_SHIFT); + *dma_handle = dma_get_device_base(dev, mem) + (pageno << PAGE_SHIFT); *ret = mem->virt_base + (pageno << PAGE_SHIFT); dma_memory_map = (mem->flags & DMA_MEMORY_MAP); spin_unlock_irqrestore(&mem->spinlock, flags); @@ -223,7 +242,7 @@ EXPORT_SYMBOL(dma_alloc_from_coherent); */ int dma_release_from_coherent(struct device *dev, int order, void *vaddr) { - struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; + struct dma_coherent_mem *mem = dev_get_coherent_memory(dev); if (mem && vaddr >= mem->virt_base && vaddr < (mem->virt_base + (mem->size << PAGE_SHIFT))) { @@ -257,7 +276,7 @@ EXPORT_SYMBOL(dma_release_from_coherent); int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma, void *vaddr, size_t size, int *ret) { - struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL; + struct dma_coherent_mem *mem = dev_get_coherent_memory(dev); if (mem && vaddr >= mem->virt_base && vaddr + size <= (mem->virt_base + (mem->size << PAGE_SHIFT))) { @@ -287,6 +306,8 @@ EXPORT_SYMBOL(dma_mmap_from_coherent); #include <linux/of_fdt.h> #include <linux/of_reserved_mem.h> +static struct reserved_mem *dma_reserved_default_memory __initdata; + static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev) { struct dma_coherent_mem *mem = rmem->priv; @@ -299,6 +320,7 @@ static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev) &rmem->base, (unsigned long)rmem->size / SZ_1M); return -ENODEV; } + mem->use_dev_dma_pfn_offset = true; rmem->priv = mem; dma_assign_coherent_memory(dev, mem); return 0; @@ -307,7 +329,8 @@ static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev) static void rmem_dma_device_release(struct reserved_mem *rmem, struct device *dev) { - dev->dma_mem = NULL; + if (dev) + dev->dma_mem = NULL; } static const struct reserved_mem_ops rmem_dma_ops = { @@ -327,6 +350,12 @@ static int __init rmem_dma_setup(struct reserved_mem *rmem) pr_err("Reserved memory: regions without no-map are not yet supported\n"); return -EINVAL; } + + if (of_get_flat_dt_prop(node, "linux,dma-default", NULL)) { + WARN(dma_reserved_default_memory, + "Reserved memory: region for default DMA coherent area is redefined\n"); + dma_reserved_default_memory = rmem; + } #endif rmem->ops = &rmem_dma_ops; @@ -334,5 +363,32 @@ static int __init rmem_dma_setup(struct reserved_mem *rmem) &rmem->base, (unsigned long)rmem->size / SZ_1M); return 0; } + +static int __init dma_init_reserved_memory(void) +{ + const struct reserved_mem_ops *ops; + int ret; + + if (!dma_reserved_default_memory) + return -ENOMEM; + + ops = dma_reserved_default_memory->ops; + + /* + * We rely on rmem_dma_device_init() does not propagate error of + * dma_assign_coherent_memory() for "NULL" device. + */ + ret = ops->device_init(dma_reserved_default_memory, NULL); + + if (!ret) { + dma_coherent_default_memory = dma_reserved_default_memory->priv; + pr_info("DMA: default coherent area is set\n"); + } + + return ret; +} + +core_initcall(dma_init_reserved_memory); + RESERVEDMEM_OF_DECLARE(dma, "shared-dma-pool", rmem_dma_setup); #endif diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c index 9dbef4d1baa4..5096755d185e 100644 --- a/drivers/base/dma-mapping.c +++ b/drivers/base/dma-mapping.c @@ -22,20 +22,15 @@ struct dma_devres { size_t size; void *vaddr; dma_addr_t dma_handle; + unsigned long attrs; }; -static void dmam_coherent_release(struct device *dev, void *res) +static void dmam_release(struct device *dev, void *res) { struct dma_devres *this = res; - dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle); -} - -static void dmam_noncoherent_release(struct device *dev, void *res) -{ - struct dma_devres *this = res; - - dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle); + dma_free_attrs(dev, this->size, this->vaddr, this->dma_handle, + this->attrs); } static int dmam_match(struct device *dev, void *res, void *match_data) @@ -69,7 +64,7 @@ void *dmam_alloc_coherent(struct device *dev, size_t size, struct dma_devres *dr; void *vaddr; - dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp); + dr = devres_alloc(dmam_release, sizeof(*dr), gfp); if (!dr) return NULL; @@ -104,35 +99,35 @@ void dmam_free_coherent(struct device *dev, size_t size, void *vaddr, struct dma_devres match_data = { size, vaddr, dma_handle }; dma_free_coherent(dev, size, vaddr, dma_handle); - WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match, - &match_data)); + WARN_ON(devres_destroy(dev, dmam_release, dmam_match, &match_data)); } EXPORT_SYMBOL(dmam_free_coherent); /** - * dmam_alloc_non_coherent - Managed dma_alloc_noncoherent() + * dmam_alloc_attrs - Managed dma_alloc_attrs() * @dev: Device to allocate non_coherent memory for * @size: Size of allocation * @dma_handle: Out argument for allocated DMA handle * @gfp: Allocation flags + * @attrs: Flags in the DMA_ATTR_* namespace. * - * Managed dma_alloc_noncoherent(). Memory allocated using this - * function will be automatically released on driver detach. + * Managed dma_alloc_attrs(). Memory allocated using this function will be + * automatically released on driver detach. * * RETURNS: * Pointer to allocated memory on success, NULL on failure. */ -void *dmam_alloc_noncoherent(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp) +void *dmam_alloc_attrs(struct device *dev, size_t size, dma_addr_t *dma_handle, + gfp_t gfp, unsigned long attrs) { struct dma_devres *dr; void *vaddr; - dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp); + dr = devres_alloc(dmam_release, sizeof(*dr), gfp); if (!dr) return NULL; - vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp); + vaddr = dma_alloc_attrs(dev, size, dma_handle, gfp, attrs); if (!vaddr) { devres_free(dr); return NULL; @@ -141,32 +136,13 @@ void *dmam_alloc_noncoherent(struct device *dev, size_t size, dr->vaddr = vaddr; dr->dma_handle = *dma_handle; dr->size = size; + dr->attrs = attrs; devres_add(dev, dr); return vaddr; } -EXPORT_SYMBOL(dmam_alloc_noncoherent); - -/** - * dmam_free_coherent - Managed dma_free_noncoherent() - * @dev: Device to free noncoherent memory for - * @size: Size of allocation - * @vaddr: Virtual address of the memory to free - * @dma_handle: DMA handle of the memory to free - * - * Managed dma_free_noncoherent(). - */ -void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle) -{ - struct dma_devres match_data = { size, vaddr, dma_handle }; - - dma_free_noncoherent(dev, size, vaddr, dma_handle); - WARN_ON(!devres_destroy(dev, dmam_noncoherent_release, dmam_match, - &match_data)); -} -EXPORT_SYMBOL(dmam_free_noncoherent); +EXPORT_SYMBOL(dmam_alloc_attrs); #ifdef CONFIG_HAVE_GENERIC_DMA_COHERENT @@ -251,7 +227,7 @@ int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size) { int ret = -ENXIO; -#if defined(CONFIG_MMU) && !defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) +#ifndef CONFIG_ARCH_NO_COHERENT_DMA_MMAP unsigned long user_count = vma_pages(vma); unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); @@ -268,7 +244,7 @@ int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, user_count << PAGE_SHIFT, vma->vm_page_prot); } -#endif /* CONFIG_MMU && !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */ +#endif /* !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */ return ret; } |