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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-04 10:58:12 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-04 10:58:12 -0700 |
commit | e5a594643a3444d39c1467040e638bf08a4e0db8 (patch) | |
tree | e65c94ef60a51559db467055232ce1021ec263e1 /arch/nds32/kernel | |
parent | f956d08a56732c61a4d44e8034eeeedfc06fe721 (diff) | |
parent | 2550bbfd495227945e17ed1fa1c05bce4753b86b (diff) | |
download | linux-stable-e5a594643a3444d39c1467040e638bf08a4e0db8.tar.gz linux-stable-e5a594643a3444d39c1467040e638bf08a4e0db8.tar.bz2 linux-stable-e5a594643a3444d39c1467040e638bf08a4e0db8.zip |
Merge tag 'dma-mapping-4.18' of git://git.infradead.org/users/hch/dma-mapping
Pull dma-mapping updates from Christoph Hellwig:
- replace the force_dma flag with a dma_configure bus method. (Nipun
Gupta, although one patch is Ñ–ncorrectly attributed to me due to a
git rebase bug)
- use GFP_DMA32 more agressively in dma-direct. (Takashi Iwai)
- remove PCI_DMA_BUS_IS_PHYS and rely on the dma-mapping API to do the
right thing for bounce buffering.
- move dma-debug initialization to common code, and apply a few
cleanups to the dma-debug code.
- cleanup the Kconfig mess around swiotlb selection
- swiotlb comment fixup (Yisheng Xie)
- a trivial swiotlb fix. (Dan Carpenter)
- support swiotlb on RISC-V. (based on a patch from Palmer Dabbelt)
- add a new generic dma-noncoherent dma_map_ops implementation and use
it for arc, c6x and nds32.
- improve scatterlist validity checking in dma-debug. (Robin Murphy)
- add a struct device quirk to limit the dma-mask to 32-bit due to
bridge/system issues, and switch x86 to use it instead of a local
hack for VIA bridges.
- handle devices without a dma_mask more gracefully in the dma-direct
code.
* tag 'dma-mapping-4.18' of git://git.infradead.org/users/hch/dma-mapping: (48 commits)
dma-direct: don't crash on device without dma_mask
nds32: use generic dma_noncoherent_ops
nds32: implement the unmap_sg DMA operation
nds32: consolidate DMA cache maintainance routines
x86/pci-dma: switch the VIA 32-bit DMA quirk to use the struct device flag
x86/pci-dma: remove the explicit nodac and allowdac option
x86/pci-dma: remove the experimental forcesac boot option
Documentation/x86: remove a stray reference to pci-nommu.c
core, dma-direct: add a flag 32-bit dma limits
dma-mapping: remove unused gfp_t parameter to arch_dma_alloc_attrs
dma-debug: check scatterlist segments
c6x: use generic dma_noncoherent_ops
arc: use generic dma_noncoherent_ops
arc: fix arc_dma_{map,unmap}_page
arc: fix arc_dma_sync_sg_for_{cpu,device}
arc: simplify arc_dma_sync_single_for_{cpu,device}
dma-mapping: provide a generic dma-noncoherent implementation
dma-mapping: simplify Kconfig dependencies
riscv: add swiotlb support
riscv: only enable ZONE_DMA32 for 64-bit
...
Diffstat (limited to 'arch/nds32/kernel')
-rw-r--r-- | arch/nds32/kernel/dma.c | 196 |
1 files changed, 55 insertions, 141 deletions
diff --git a/arch/nds32/kernel/dma.c b/arch/nds32/kernel/dma.c index d291800fc621..d0dbd4fe9645 100644 --- a/arch/nds32/kernel/dma.c +++ b/arch/nds32/kernel/dma.c @@ -3,17 +3,14 @@ #include <linux/types.h> #include <linux/mm.h> -#include <linux/export.h> #include <linux/string.h> -#include <linux/scatterlist.h> -#include <linux/dma-mapping.h> +#include <linux/dma-noncoherent.h> #include <linux/io.h> #include <linux/cache.h> #include <linux/highmem.h> #include <linux/slab.h> #include <asm/cacheflush.h> #include <asm/tlbflush.h> -#include <asm/dma-mapping.h> #include <asm/proc-fns.h> /* @@ -22,11 +19,6 @@ static pte_t *consistent_pte; static DEFINE_RAW_SPINLOCK(consistent_lock); -enum master_type { - FOR_CPU = 0, - FOR_DEVICE = 1, -}; - /* * VM region handling support. * @@ -124,10 +116,8 @@ out: return c; } -/* FIXME: attrs is not used. */ -static void *nds32_dma_alloc_coherent(struct device *dev, size_t size, - dma_addr_t * handle, gfp_t gfp, - unsigned long attrs) +void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, + gfp_t gfp, unsigned long attrs) { struct page *page; struct arch_vm_region *c; @@ -232,8 +222,8 @@ no_page: return NULL; } -static void nds32_dma_free(struct device *dev, size_t size, void *cpu_addr, - dma_addr_t handle, unsigned long attrs) +void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, + dma_addr_t handle, unsigned long attrs) { struct arch_vm_region *c; unsigned long flags, addr; @@ -333,145 +323,69 @@ static int __init consistent_init(void) } core_initcall(consistent_init); -static void consistent_sync(void *vaddr, size_t size, int direction, int master_type); -static dma_addr_t nds32_dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - unsigned long attrs) -{ - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - consistent_sync((void *)(page_address(page) + offset), size, dir, FOR_DEVICE); - return page_to_phys(page) + offset; -} - -static void nds32_dma_unmap_page(struct device *dev, dma_addr_t handle, - size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - consistent_sync(phys_to_virt(handle), size, dir, FOR_CPU); -} - -/* - * Make an area consistent for devices. - */ -static void consistent_sync(void *vaddr, size_t size, int direction, int master_type) -{ - unsigned long start = (unsigned long)vaddr; - unsigned long end = start + size; - - if (master_type == FOR_CPU) { - switch (direction) { - case DMA_TO_DEVICE: - break; - case DMA_FROM_DEVICE: - case DMA_BIDIRECTIONAL: - cpu_dma_inval_range(start, end); - break; - default: - BUG(); - } - } else { - /* FOR_DEVICE */ - switch (direction) { - case DMA_FROM_DEVICE: - break; - case DMA_TO_DEVICE: - case DMA_BIDIRECTIONAL: - cpu_dma_wb_range(start, end); - break; - default: - BUG(); - } - } -} -static int nds32_dma_map_sg(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction dir, - unsigned long attrs) +static inline void cache_op(phys_addr_t paddr, size_t size, + void (*fn)(unsigned long start, unsigned long end)) { - int i; + struct page *page = pfn_to_page(paddr >> PAGE_SHIFT); + unsigned offset = paddr & ~PAGE_MASK; + size_t left = size; + unsigned long start; - for (i = 0; i < nents; i++, sg++) { - void *virt; - unsigned long pfn; - struct page *page = sg_page(sg); + do { + size_t len = left; - sg->dma_address = sg_phys(sg); - pfn = page_to_pfn(page) + sg->offset / PAGE_SIZE; - page = pfn_to_page(pfn); if (PageHighMem(page)) { - virt = kmap_atomic(page); - consistent_sync(virt, sg->length, dir, FOR_CPU); - kunmap_atomic(virt); + void *addr; + + if (offset + len > PAGE_SIZE) { + if (offset >= PAGE_SIZE) { + page += offset >> PAGE_SHIFT; + offset &= ~PAGE_MASK; + } + len = PAGE_SIZE - offset; + } + + addr = kmap_atomic(page); + start = (unsigned long)(addr + offset); + fn(start, start + len); + kunmap_atomic(addr); } else { - if (sg->offset > PAGE_SIZE) - panic("sg->offset:%08x > PAGE_SIZE\n", - sg->offset); - virt = page_address(page) + sg->offset; - consistent_sync(virt, sg->length, dir, FOR_CPU); + start = (unsigned long)phys_to_virt(paddr); + fn(start, start + size); } - } - return nents; + offset = 0; + page++; + left -= len; + } while (left); } -static void nds32_dma_unmap_sg(struct device *dev, struct scatterlist *sg, - int nhwentries, enum dma_data_direction dir, - unsigned long attrs) +void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) { -} - -static void -nds32_dma_sync_single_for_cpu(struct device *dev, dma_addr_t handle, - size_t size, enum dma_data_direction dir) -{ - consistent_sync((void *)phys_to_virt(handle), size, dir, FOR_CPU); -} - -static void -nds32_dma_sync_single_for_device(struct device *dev, dma_addr_t handle, - size_t size, enum dma_data_direction dir) -{ - consistent_sync((void *)phys_to_virt(handle), size, dir, FOR_DEVICE); -} - -static void -nds32_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nents, - enum dma_data_direction dir) -{ - int i; - - for (i = 0; i < nents; i++, sg++) { - char *virt = - page_address((struct page *)sg->page_link) + sg->offset; - consistent_sync(virt, sg->length, dir, FOR_CPU); + switch (dir) { + case DMA_FROM_DEVICE: + break; + case DMA_TO_DEVICE: + case DMA_BIDIRECTIONAL: + cache_op(paddr, size, cpu_dma_wb_range); + break; + default: + BUG(); } } -static void -nds32_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction dir) +void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) { - int i; - - for (i = 0; i < nents; i++, sg++) { - char *virt = - page_address((struct page *)sg->page_link) + sg->offset; - consistent_sync(virt, sg->length, dir, FOR_DEVICE); + switch (dir) { + case DMA_TO_DEVICE: + break; + case DMA_FROM_DEVICE: + case DMA_BIDIRECTIONAL: + cache_op(paddr, size, cpu_dma_inval_range); + break; + default: + BUG(); } } - -struct dma_map_ops nds32_dma_ops = { - .alloc = nds32_dma_alloc_coherent, - .free = nds32_dma_free, - .map_page = nds32_dma_map_page, - .unmap_page = nds32_dma_unmap_page, - .map_sg = nds32_dma_map_sg, - .unmap_sg = nds32_dma_unmap_sg, - .sync_single_for_device = nds32_dma_sync_single_for_device, - .sync_single_for_cpu = nds32_dma_sync_single_for_cpu, - .sync_sg_for_cpu = nds32_dma_sync_sg_for_cpu, - .sync_sg_for_device = nds32_dma_sync_sg_for_device, -}; - -EXPORT_SYMBOL(nds32_dma_ops); |