diff options
Diffstat (limited to 'kernel/dma/direct.c')
| -rw-r--r-- | kernel/dma/direct.c | 582 |
1 files changed, 371 insertions, 211 deletions
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index ac7956c38f69..63859a101ed8 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -1,23 +1,22 @@ // SPDX-License-Identifier: GPL-2.0 /* - * Copyright (C) 2018 Christoph Hellwig. + * Copyright (C) 2018-2020 Christoph Hellwig. * * DMA operations that map physical memory directly without using an IOMMU. */ #include <linux/memblock.h> /* for max_pfn */ #include <linux/export.h> #include <linux/mm.h> -#include <linux/dma-direct.h> +#include <linux/dma-map-ops.h> #include <linux/scatterlist.h> -#include <linux/dma-contiguous.h> -#include <linux/dma-noncoherent.h> #include <linux/pfn.h> #include <linux/vmalloc.h> #include <linux/set_memory.h> -#include <linux/swiotlb.h> +#include <linux/slab.h> +#include "direct.h" /* - * Most architectures use ZONE_DMA for the first 16 Megabytes, but some use it + * Most architectures use ZONE_DMA for the first 16 Megabytes, but some use * it for entirely different regions. In that case the arch code needs to * override the variable below for dma-direct to work properly. */ @@ -27,7 +26,7 @@ static inline dma_addr_t phys_to_dma_direct(struct device *dev, phys_addr_t phys) { if (force_dma_unencrypted(dev)) - return __phys_to_dma(dev, phys); + return phys_to_dma_unencrypted(dev, phys); return phys_to_dma(dev, phys); } @@ -39,21 +38,17 @@ static inline struct page *dma_direct_to_page(struct device *dev, u64 dma_direct_get_required_mask(struct device *dev) { - u64 max_dma = phys_to_dma_direct(dev, (max_pfn - 1) << PAGE_SHIFT); + phys_addr_t phys = (phys_addr_t)(max_pfn - 1) << PAGE_SHIFT; + u64 max_dma = phys_to_dma_direct(dev, phys); return (1ULL << (fls64(max_dma) - 1)) * 2 - 1; } -static gfp_t __dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask, - u64 *phys_limit) +static gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask, + u64 *phys_limit) { u64 dma_limit = min_not_zero(dma_mask, dev->bus_dma_limit); - if (force_dma_unencrypted(dev)) - *phys_limit = __dma_to_phys(dev, dma_limit); - else - *phys_limit = dma_to_phys(dev, dma_limit); - /* * Optimistically try the zone that the physical address mask falls * into first. If that returns memory that isn't actually addressable @@ -62,6 +57,7 @@ static gfp_t __dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask, * Note that GFP_DMA32 and GFP_DMA are no ops without the corresponding * zones. */ + *phys_limit = dma_to_phys(dev, dma_limit); if (*phys_limit <= DMA_BIT_MASK(zone_dma_bits)) return GFP_DMA; if (*phys_limit <= DMA_BIT_MASK(32)) @@ -71,33 +67,78 @@ static gfp_t __dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask, static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size) { - return phys_to_dma_direct(dev, phys) + size - 1 <= - min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit); + dma_addr_t dma_addr = phys_to_dma_direct(dev, phys); + + if (dma_addr == DMA_MAPPING_ERROR) + return false; + return dma_addr + size - 1 <= + min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit); +} + +static int dma_set_decrypted(struct device *dev, void *vaddr, size_t size) +{ + if (!force_dma_unencrypted(dev)) + return 0; + return set_memory_decrypted((unsigned long)vaddr, PFN_UP(size)); +} + +static int dma_set_encrypted(struct device *dev, void *vaddr, size_t size) +{ + int ret; + + if (!force_dma_unencrypted(dev)) + return 0; + ret = set_memory_encrypted((unsigned long)vaddr, PFN_UP(size)); + if (ret) + pr_warn_ratelimited("leaking DMA memory that can't be re-encrypted\n"); + return ret; +} + +static void __dma_direct_free_pages(struct device *dev, struct page *page, + size_t size) +{ + if (swiotlb_free(dev, page, size)) + return; + dma_free_contiguous(dev, page, size); } -struct page *__dma_direct_alloc_pages(struct device *dev, size_t size, - gfp_t gfp, unsigned long attrs) +static struct page *dma_direct_alloc_swiotlb(struct device *dev, size_t size) +{ + struct page *page = swiotlb_alloc(dev, size); + + if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) { + swiotlb_free(dev, page, size); + return NULL; + } + + return page; +} + +static struct page *__dma_direct_alloc_pages(struct device *dev, size_t size, + gfp_t gfp, bool allow_highmem) { - size_t alloc_size = PAGE_ALIGN(size); int node = dev_to_node(dev); struct page *page = NULL; u64 phys_limit; - if (attrs & DMA_ATTR_NO_WARN) - gfp |= __GFP_NOWARN; + WARN_ON_ONCE(!PAGE_ALIGNED(size)); - /* we always manually zero the memory once we are done: */ - gfp &= ~__GFP_ZERO; - gfp |= __dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask, - &phys_limit); - page = dma_alloc_contiguous(dev, alloc_size, gfp); - if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) { - dma_free_contiguous(dev, page, alloc_size); - page = NULL; + if (is_swiotlb_for_alloc(dev)) + return dma_direct_alloc_swiotlb(dev, size); + + gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask, + &phys_limit); + page = dma_alloc_contiguous(dev, size, gfp); + if (page) { + if (!dma_coherent_ok(dev, page_to_phys(page), size) || + (!allow_highmem && PageHighMem(page))) { + dma_free_contiguous(dev, page, size); + page = NULL; + } } again: if (!page) - page = alloc_pages_node(node, gfp, get_order(alloc_size)); + page = alloc_pages_node(node, gfp, get_order(size)); if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) { dma_free_contiguous(dev, page, size); page = NULL; @@ -118,146 +159,253 @@ again: return page; } -void *dma_direct_alloc_pages(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) +/* + * Check if a potentially blocking operations needs to dip into the atomic + * pools for the given device/gfp. + */ +static bool dma_direct_use_pool(struct device *dev, gfp_t gfp) +{ + return !gfpflags_allow_blocking(gfp) && !is_swiotlb_for_alloc(dev); +} + +static void *dma_direct_alloc_from_pool(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp) { struct page *page; + u64 phys_mask; void *ret; - if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && - dma_alloc_need_uncached(dev, attrs) && - !gfpflags_allow_blocking(gfp)) { - ret = dma_alloc_from_pool(PAGE_ALIGN(size), &page, gfp); - if (!ret) - return NULL; - goto done; - } + if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_DMA_COHERENT_POOL))) + return NULL; - page = __dma_direct_alloc_pages(dev, size, gfp, attrs); + gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask, + &phys_mask); + page = dma_alloc_from_pool(dev, size, &ret, gfp, dma_coherent_ok); if (!page) return NULL; + *dma_handle = phys_to_dma_direct(dev, page_to_phys(page)); + return ret; +} - if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) && - !force_dma_unencrypted(dev)) { - /* remove any dirty cache lines on the kernel alias */ - if (!PageHighMem(page)) - arch_dma_prep_coherent(page, size); - /* return the page pointer as the opaque cookie */ - ret = page; - goto done; - } +static void *dma_direct_alloc_no_mapping(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp) +{ + struct page *page; - if ((IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && - dma_alloc_need_uncached(dev, attrs)) || - (IS_ENABLED(CONFIG_DMA_REMAP) && PageHighMem(page))) { - /* remove any dirty cache lines on the kernel alias */ - arch_dma_prep_coherent(page, PAGE_ALIGN(size)); + page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO, true); + if (!page) + return NULL; - /* create a coherent mapping */ - ret = dma_common_contiguous_remap(page, PAGE_ALIGN(size), - dma_pgprot(dev, PAGE_KERNEL, attrs), - __builtin_return_address(0)); - if (!ret) { - dma_free_contiguous(dev, page, size); - return ret; - } + /* remove any dirty cache lines on the kernel alias */ + if (!PageHighMem(page)) + arch_dma_prep_coherent(page, size); - memset(ret, 0, size); - goto done; - } + /* return the page pointer as the opaque cookie */ + *dma_handle = phys_to_dma_direct(dev, page_to_phys(page)); + return page; +} - if (PageHighMem(page)) { +void *dma_direct_alloc(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) +{ + bool remap = false, set_uncached = false; + struct page *page; + void *ret; + + size = PAGE_ALIGN(size); + if (attrs & DMA_ATTR_NO_WARN) + gfp |= __GFP_NOWARN; + + if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) && + !force_dma_unencrypted(dev) && !is_swiotlb_for_alloc(dev)) + return dma_direct_alloc_no_mapping(dev, size, dma_handle, gfp); + + if (!dev_is_dma_coherent(dev)) { /* - * Depending on the cma= arguments and per-arch setup - * dma_alloc_contiguous could return highmem pages. - * Without remapping there is no way to return them here, - * so log an error and fail. + * Fallback to the arch handler if it exists. This should + * eventually go away. */ - dev_info(dev, "Rejecting highmem page from CMA.\n"); - dma_free_contiguous(dev, page, size); + if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) && + !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && + !IS_ENABLED(CONFIG_DMA_GLOBAL_POOL) && + !is_swiotlb_for_alloc(dev)) + return arch_dma_alloc(dev, size, dma_handle, gfp, + attrs); + + /* + * If there is a global pool, always allocate from it for + * non-coherent devices. + */ + if (IS_ENABLED(CONFIG_DMA_GLOBAL_POOL)) + return dma_alloc_from_global_coherent(dev, size, + dma_handle); + + /* + * Otherwise remap if the architecture is asking for it. But + * given that remapping memory is a blocking operation we'll + * instead have to dip into the atomic pools. + */ + remap = IS_ENABLED(CONFIG_DMA_DIRECT_REMAP); + if (remap) { + if (dma_direct_use_pool(dev, gfp)) + return dma_direct_alloc_from_pool(dev, size, + dma_handle, gfp); + } else { + if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED)) + return NULL; + set_uncached = true; + } + } + + /* + * Decrypting memory may block, so allocate the memory from the atomic + * pools if we can't block. + */ + if (force_dma_unencrypted(dev) && dma_direct_use_pool(dev, gfp)) + return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp); + + /* we always manually zero the memory once we are done */ + page = __dma_direct_alloc_pages(dev, size, gfp & ~__GFP_ZERO, true); + if (!page) return NULL; + + /* + * dma_alloc_contiguous can return highmem pages depending on a + * combination the cma= arguments and per-arch setup. These need to be + * remapped to return a kernel virtual address. + */ + if (PageHighMem(page)) { + remap = true; + set_uncached = false; } - ret = page_address(page); - if (force_dma_unencrypted(dev)) - set_memory_decrypted((unsigned long)ret, 1 << get_order(size)); + if (remap) { + pgprot_t prot = dma_pgprot(dev, PAGE_KERNEL, attrs); + + if (force_dma_unencrypted(dev)) + prot = pgprot_decrypted(prot); + + /* remove any dirty cache lines on the kernel alias */ + arch_dma_prep_coherent(page, size); + + /* create a coherent mapping */ + ret = dma_common_contiguous_remap(page, size, prot, + __builtin_return_address(0)); + if (!ret) + goto out_free_pages; + } else { + ret = page_address(page); + if (dma_set_decrypted(dev, ret, size)) + goto out_free_pages; + } memset(ret, 0, size); - if (IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) && - dma_alloc_need_uncached(dev, attrs)) { + if (set_uncached) { arch_dma_prep_coherent(page, size); - ret = uncached_kernel_address(ret); + ret = arch_dma_set_uncached(ret, size); + if (IS_ERR(ret)) + goto out_encrypt_pages; } -done: - if (force_dma_unencrypted(dev)) - *dma_handle = __phys_to_dma(dev, page_to_phys(page)); - else - *dma_handle = phys_to_dma(dev, page_to_phys(page)); + + *dma_handle = phys_to_dma_direct(dev, page_to_phys(page)); return ret; + +out_encrypt_pages: + if (dma_set_encrypted(dev, page_address(page), size)) + return NULL; +out_free_pages: + __dma_direct_free_pages(dev, page, size); + return NULL; } -void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr, - dma_addr_t dma_addr, unsigned long attrs) +void dma_direct_free(struct device *dev, size_t size, + void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs) { unsigned int page_order = get_order(size); if ((attrs & DMA_ATTR_NO_KERNEL_MAPPING) && - !force_dma_unencrypted(dev)) { + !force_dma_unencrypted(dev) && !is_swiotlb_for_alloc(dev)) { /* cpu_addr is a struct page cookie, not a kernel address */ dma_free_contiguous(dev, cpu_addr, size); return; } - if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && - dma_free_from_pool(cpu_addr, PAGE_ALIGN(size))) + if (!IS_ENABLED(CONFIG_ARCH_HAS_DMA_SET_UNCACHED) && + !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && + !IS_ENABLED(CONFIG_DMA_GLOBAL_POOL) && + !dev_is_dma_coherent(dev) && + !is_swiotlb_for_alloc(dev)) { + arch_dma_free(dev, size, cpu_addr, dma_addr, attrs); return; + } - if (force_dma_unencrypted(dev)) - set_memory_encrypted((unsigned long)cpu_addr, 1 << page_order); + if (IS_ENABLED(CONFIG_DMA_GLOBAL_POOL) && + !dev_is_dma_coherent(dev)) { + if (!dma_release_from_global_coherent(page_order, cpu_addr)) + WARN_ON_ONCE(1); + return; + } + + /* If cpu_addr is not from an atomic pool, dma_free_from_pool() fails */ + if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) && + dma_free_from_pool(dev, cpu_addr, PAGE_ALIGN(size))) + return; - if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) + if (is_vmalloc_addr(cpu_addr)) { vunmap(cpu_addr); + } else { + if (IS_ENABLED(CONFIG_ARCH_HAS_DMA_CLEAR_UNCACHED)) + arch_dma_clear_uncached(cpu_addr, size); + if (dma_set_encrypted(dev, cpu_addr, size)) + return; + } - dma_free_contiguous(dev, dma_direct_to_page(dev, dma_addr), size); + __dma_direct_free_pages(dev, dma_direct_to_page(dev, dma_addr), size); } -void *dma_direct_alloc(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) +struct page *dma_direct_alloc_pages(struct device *dev, size_t size, + dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp) { - if (!IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) && - !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && - dma_alloc_need_uncached(dev, attrs)) - return arch_dma_alloc(dev, size, dma_handle, gfp, attrs); - return dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs); -} + struct page *page; + void *ret; -void dma_direct_free(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t dma_addr, unsigned long attrs) -{ - if (!IS_ENABLED(CONFIG_ARCH_HAS_UNCACHED_SEGMENT) && - !IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) && - dma_alloc_need_uncached(dev, attrs)) - arch_dma_free(dev, size, cpu_addr, dma_addr, attrs); - else - dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs); + if (force_dma_unencrypted(dev) && dma_direct_use_pool(dev, gfp)) + return dma_direct_alloc_from_pool(dev, size, dma_handle, gfp); + + page = __dma_direct_alloc_pages(dev, size, gfp, false); + if (!page) + return NULL; + + ret = page_address(page); + if (dma_set_decrypted(dev, ret, size)) + goto out_free_pages; + memset(ret, 0, size); + *dma_handle = phys_to_dma_direct(dev, page_to_phys(page)); + return page; +out_free_pages: + __dma_direct_free_pages(dev, page, size); + return NULL; } -#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ - defined(CONFIG_SWIOTLB) -void dma_direct_sync_single_for_device(struct device *dev, - dma_addr_t addr, size_t size, enum dma_data_direction dir) +void dma_direct_free_pages(struct device *dev, size_t size, + struct page *page, dma_addr_t dma_addr, + enum dma_data_direction dir) { - phys_addr_t paddr = dma_to_phys(dev, addr); + void *vaddr = page_address(page); - if (unlikely(is_swiotlb_buffer(paddr))) - swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_DEVICE); + /* If cpu_addr is not from an atomic pool, dma_free_from_pool() fails */ + if (IS_ENABLED(CONFIG_DMA_COHERENT_POOL) && + dma_free_from_pool(dev, vaddr, size)) + return; - if (!dev_is_dma_coherent(dev)) - arch_sync_dma_for_device(paddr, size, dir); + if (dma_set_encrypted(dev, vaddr, size)) + return; + __dma_direct_free_pages(dev, page, size); } -EXPORT_SYMBOL(dma_direct_sync_single_for_device); +#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ + defined(CONFIG_SWIOTLB) void dma_direct_sync_sg_for_device(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir) { @@ -267,36 +415,20 @@ void dma_direct_sync_sg_for_device(struct device *dev, for_each_sg(sgl, sg, nents, i) { phys_addr_t paddr = dma_to_phys(dev, sg_dma_address(sg)); - if (unlikely(is_swiotlb_buffer(paddr))) - swiotlb_tbl_sync_single(dev, paddr, sg->length, - dir, SYNC_FOR_DEVICE); + if (unlikely(is_swiotlb_buffer(dev, paddr))) + swiotlb_sync_single_for_device(dev, paddr, sg->length, + dir); if (!dev_is_dma_coherent(dev)) arch_sync_dma_for_device(paddr, sg->length, dir); } } -EXPORT_SYMBOL(dma_direct_sync_sg_for_device); #endif #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) || \ defined(CONFIG_SWIOTLB) -void dma_direct_sync_single_for_cpu(struct device *dev, - dma_addr_t addr, size_t size, enum dma_data_direction dir) -{ - phys_addr_t paddr = dma_to_phys(dev, addr); - - if (!dev_is_dma_coherent(dev)) { - arch_sync_dma_for_cpu(paddr, size, dir); - arch_sync_dma_for_cpu_all(); - } - - if (unlikely(is_swiotlb_buffer(paddr))) - swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_CPU); -} -EXPORT_SYMBOL(dma_direct_sync_single_for_cpu); - void dma_direct_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir) { @@ -309,79 +441,72 @@ void dma_direct_sync_sg_for_cpu(struct device *dev, if (!dev_is_dma_coherent(dev)) arch_sync_dma_for_cpu(paddr, sg->length, dir); - if (unlikely(is_swiotlb_buffer(paddr))) - swiotlb_tbl_sync_single(dev, paddr, sg->length, dir, - SYNC_FOR_CPU); + if (unlikely(is_swiotlb_buffer(dev, paddr))) + swiotlb_sync_single_for_cpu(dev, paddr, sg->length, + dir); + + if (dir == DMA_FROM_DEVICE) + arch_dma_mark_clean(paddr, sg->length); } if (!dev_is_dma_coherent(dev)) arch_sync_dma_for_cpu_all(); } -EXPORT_SYMBOL(dma_direct_sync_sg_for_cpu); - -void dma_direct_unmap_page(struct device *dev, dma_addr_t addr, - size_t size, enum dma_data_direction dir, unsigned long attrs) -{ - phys_addr_t phys = dma_to_phys(dev, addr); - - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - dma_direct_sync_single_for_cpu(dev, addr, size, dir); - - if (unlikely(is_swiotlb_buffer(phys))) - swiotlb_tbl_unmap_single(dev, phys, size, size, dir, attrs); -} -EXPORT_SYMBOL(dma_direct_unmap_page); +/* + * Unmaps segments, except for ones marked as pci_p2pdma which do not + * require any further action as they contain a bus address. + */ void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir, unsigned long attrs) { struct scatterlist *sg; int i; - for_each_sg(sgl, sg, nents, i) - dma_direct_unmap_page(dev, sg->dma_address, sg_dma_len(sg), dir, - attrs); -} -EXPORT_SYMBOL(dma_direct_unmap_sg); -#endif - -dma_addr_t dma_direct_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ - phys_addr_t phys = page_to_phys(page) + offset; - dma_addr_t dma_addr = phys_to_dma(dev, phys); - - if (unlikely(swiotlb_force == SWIOTLB_FORCE)) - return swiotlb_map(dev, phys, size, dir, attrs); - - if (unlikely(!dma_capable(dev, dma_addr, size, true))) { - if (swiotlb_force != SWIOTLB_NO_FORCE) - return swiotlb_map(dev, phys, size, dir, attrs); - - dev_WARN_ONCE(dev, 1, - "DMA addr %pad+%zu overflow (mask %llx, bus limit %llx).\n", - &dma_addr, size, *dev->dma_mask, dev->bus_dma_limit); - return DMA_MAPPING_ERROR; + for_each_sg(sgl, sg, nents, i) { + if (sg_is_dma_bus_address(sg)) + sg_dma_unmark_bus_address(sg); + else + dma_direct_unmap_page(dev, sg->dma_address, + sg_dma_len(sg), dir, attrs); } - - if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - arch_sync_dma_for_device(phys, size, dir); - return dma_addr; } -EXPORT_SYMBOL(dma_direct_map_page); +#endif int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir, unsigned long attrs) { - int i; + struct pci_p2pdma_map_state p2pdma_state = {}; + enum pci_p2pdma_map_type map; struct scatterlist *sg; + int i, ret; for_each_sg(sgl, sg, nents, i) { + if (is_pci_p2pdma_page(sg_page(sg))) { + map = pci_p2pdma_map_segment(&p2pdma_state, dev, sg); + switch (map) { + case PCI_P2PDMA_MAP_BUS_ADDR: + continue; + case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: + /* + * Any P2P mapping that traverses the PCI + * host bridge must be mapped with CPU physical + * address and not PCI bus addresses. This is + * done with dma_direct_map_page() below. + */ + break; + default: + ret = -EREMOTEIO; + goto out_unmap; + } + } + sg->dma_address = dma_direct_map_page(dev, sg_page(sg), sg->offset, sg->length, dir, attrs); - if (sg->dma_address == DMA_MAPPING_ERROR) + if (sg->dma_address == DMA_MAPPING_ERROR) { + ret = -EIO; goto out_unmap; + } sg_dma_len(sg) = sg->length; } @@ -389,9 +514,8 @@ int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, out_unmap: dma_direct_unmap_sg(dev, sgl, i, dir, attrs | DMA_ATTR_SKIP_CPU_SYNC); - return 0; + return ret; } -EXPORT_SYMBOL(dma_direct_map_sg); dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr, size_t size, enum dma_data_direction dir, unsigned long attrs) @@ -408,7 +532,6 @@ dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr, return dma_addr; } -EXPORT_SYMBOL(dma_direct_map_resource); int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, size_t size, @@ -423,7 +546,6 @@ int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt, return ret; } -#ifdef CONFIG_MMU bool dma_direct_can_mmap(struct device *dev) { return dev_is_dma_coherent(dev) || @@ -440,28 +562,19 @@ int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma, int ret = -ENXIO; vma->vm_page_prot = dma_pgprot(dev, vma->vm_page_prot, attrs); + if (force_dma_unencrypted(dev)) + vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) return ret; + if (dma_mmap_from_global_coherent(vma, cpu_addr, size, &ret)) + return ret; if (vma->vm_pgoff >= count || user_count > count - vma->vm_pgoff) return -ENXIO; return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff, user_count << PAGE_SHIFT, vma->vm_page_prot); } -#else /* CONFIG_MMU */ -bool dma_direct_can_mmap(struct device *dev) -{ - return false; -} - -int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma, - void *cpu_addr, dma_addr_t dma_addr, size_t size, - unsigned long attrs) -{ - return -ENXIO; -} -#endif /* CONFIG_MMU */ int dma_direct_supported(struct device *dev, u64 mask) { @@ -477,20 +590,67 @@ int dma_direct_supported(struct device *dev, u64 mask) return 1; /* - * This check needs to be against the actual bit mask value, so - * use __phys_to_dma() here so that the SME encryption mask isn't + * This check needs to be against the actual bit mask value, so use + * phys_to_dma_unencrypted() here so that the SME encryption mask isn't * part of the check. */ if (IS_ENABLED(CONFIG_ZONE_DMA)) min_mask = min_t(u64, min_mask, DMA_BIT_MASK(zone_dma_bits)); - return mask >= __phys_to_dma(dev, min_mask); + return mask >= phys_to_dma_unencrypted(dev, min_mask); } size_t dma_direct_max_mapping_size(struct device *dev) { /* If SWIOTLB is active, use its maximum mapping size */ - if (is_swiotlb_active() && - (dma_addressing_limited(dev) || swiotlb_force == SWIOTLB_FORCE)) + if (is_swiotlb_active(dev) && + (dma_addressing_limited(dev) || is_swiotlb_force_bounce(dev))) return swiotlb_max_mapping_size(dev); return SIZE_MAX; } + +bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr) +{ + return !dev_is_dma_coherent(dev) || + is_swiotlb_buffer(dev, dma_to_phys(dev, dma_addr)); +} + +/** + * dma_direct_set_offset - Assign scalar offset for a single DMA range. + * @dev: device pointer; needed to "own" the alloced memory. + * @cpu_start: beginning of memory region covered by this offset. + * @dma_start: beginning of DMA/PCI region covered by this offset. + * @size: size of the region. + * + * This is for the simple case of a uniform offset which cannot + * be discovered by "dma-ranges". + * + * It returns -ENOMEM if out of memory, -EINVAL if a map + * already exists, 0 otherwise. + * + * Note: any call to this from a driver is a bug. The mapping needs + * to be described by the device tree or other firmware interfaces. + */ +int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start, + dma_addr_t dma_start, u64 size) +{ + struct bus_dma_region *map; + u64 offset = (u64)cpu_start - (u64)dma_start; + + if (dev->dma_range_map) { + dev_err(dev, "attempt to add DMA range to existing map\n"); + return -EINVAL; + } + + if (!offset) + return 0; + + map = kcalloc(2, sizeof(*map), GFP_KERNEL); + if (!map) + return -ENOMEM; + map[0].cpu_start = cpu_start; + map[0].dma_start = dma_start; + map[0].offset = offset; + map[0].size = size; + dev->dma_range_map = map; + return 0; +} |