10ddbccd1SRussell King /* 20ddbccd1SRussell King * linux/arch/arm/mm/dma-mapping.c 30ddbccd1SRussell King * 40ddbccd1SRussell King * Copyright (C) 2000-2004 Russell King 50ddbccd1SRussell King * 60ddbccd1SRussell King * This program is free software; you can redistribute it and/or modify 70ddbccd1SRussell King * it under the terms of the GNU General Public License version 2 as 80ddbccd1SRussell King * published by the Free Software Foundation. 90ddbccd1SRussell King * 100ddbccd1SRussell King * DMA uncached mapping support. 110ddbccd1SRussell King */ 120ddbccd1SRussell King #include <linux/module.h> 130ddbccd1SRussell King #include <linux/mm.h> 145a0e3ad6STejun Heo #include <linux/gfp.h> 150ddbccd1SRussell King #include <linux/errno.h> 160ddbccd1SRussell King #include <linux/list.h> 170ddbccd1SRussell King #include <linux/init.h> 180ddbccd1SRussell King #include <linux/device.h> 190ddbccd1SRussell King #include <linux/dma-mapping.h> 20c7909509SMarek Szyprowski #include <linux/dma-contiguous.h> 2139af22a7SNicolas Pitre #include <linux/highmem.h> 22c7909509SMarek Szyprowski #include <linux/memblock.h> 2399d1717dSJon Medhurst #include <linux/slab.h> 244ce63fcdSMarek Szyprowski #include <linux/iommu.h> 25e9da6e99SMarek Szyprowski #include <linux/io.h> 264ce63fcdSMarek Szyprowski #include <linux/vmalloc.h> 27158e8bfeSAlessandro Rubini #include <linux/sizes.h> 280ddbccd1SRussell King 290ddbccd1SRussell King #include <asm/memory.h> 3043377453SNicolas Pitre #include <asm/highmem.h> 310ddbccd1SRussell King #include <asm/cacheflush.h> 320ddbccd1SRussell King #include <asm/tlbflush.h> 3399d1717dSJon Medhurst #include <asm/mach/arch.h> 344ce63fcdSMarek Szyprowski #include <asm/dma-iommu.h> 35c7909509SMarek Szyprowski #include <asm/mach/map.h> 36c7909509SMarek Szyprowski #include <asm/system_info.h> 37c7909509SMarek Szyprowski #include <asm/dma-contiguous.h> 380ddbccd1SRussell King 39022ae537SRussell King #include "mm.h" 40022ae537SRussell King 4115237e1fSMarek Szyprowski /* 4215237e1fSMarek Szyprowski * The DMA API is built upon the notion of "buffer ownership". A buffer 4315237e1fSMarek Szyprowski * is either exclusively owned by the CPU (and therefore may be accessed 4415237e1fSMarek Szyprowski * by it) or exclusively owned by the DMA device. These helper functions 4515237e1fSMarek Szyprowski * represent the transitions between these two ownership states. 4615237e1fSMarek Szyprowski * 4715237e1fSMarek Szyprowski * Note, however, that on later ARMs, this notion does not work due to 4815237e1fSMarek Szyprowski * speculative prefetches. We model our approach on the assumption that 4915237e1fSMarek Szyprowski * the CPU does do speculative prefetches, which means we clean caches 5015237e1fSMarek Szyprowski * before transfers and delay cache invalidation until transfer completion. 5115237e1fSMarek Szyprowski * 5215237e1fSMarek Szyprowski */ 5351fde349SMarek Szyprowski static void __dma_page_cpu_to_dev(struct page *, unsigned long, 5415237e1fSMarek Szyprowski size_t, enum dma_data_direction); 5551fde349SMarek Szyprowski static void __dma_page_dev_to_cpu(struct page *, unsigned long, 5615237e1fSMarek Szyprowski size_t, enum dma_data_direction); 5715237e1fSMarek Szyprowski 582dc6a016SMarek Szyprowski /** 592dc6a016SMarek Szyprowski * arm_dma_map_page - map a portion of a page for streaming DMA 602dc6a016SMarek Szyprowski * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices 612dc6a016SMarek Szyprowski * @page: page that buffer resides in 622dc6a016SMarek Szyprowski * @offset: offset into page for start of buffer 632dc6a016SMarek Szyprowski * @size: size of buffer to map 642dc6a016SMarek Szyprowski * @dir: DMA transfer direction 652dc6a016SMarek Szyprowski * 662dc6a016SMarek Szyprowski * Ensure that any data held in the cache is appropriately discarded 672dc6a016SMarek Szyprowski * or written back. 682dc6a016SMarek Szyprowski * 692dc6a016SMarek Szyprowski * The device owns this memory once this call has completed. The CPU 702dc6a016SMarek Szyprowski * can regain ownership by calling dma_unmap_page(). 712dc6a016SMarek Szyprowski */ 7251fde349SMarek Szyprowski static dma_addr_t arm_dma_map_page(struct device *dev, struct page *page, 732dc6a016SMarek Szyprowski unsigned long offset, size_t size, enum dma_data_direction dir, 742dc6a016SMarek Szyprowski struct dma_attrs *attrs) 752dc6a016SMarek Szyprowski { 76dd37e940SRob Herring if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) 7751fde349SMarek Szyprowski __dma_page_cpu_to_dev(page, offset, size, dir); 7851fde349SMarek Szyprowski return pfn_to_dma(dev, page_to_pfn(page)) + offset; 792dc6a016SMarek Szyprowski } 802dc6a016SMarek Szyprowski 81dd37e940SRob Herring static dma_addr_t arm_coherent_dma_map_page(struct device *dev, struct page *page, 82dd37e940SRob Herring unsigned long offset, size_t size, enum dma_data_direction dir, 83dd37e940SRob Herring struct dma_attrs *attrs) 84dd37e940SRob Herring { 85dd37e940SRob Herring return pfn_to_dma(dev, page_to_pfn(page)) + offset; 86dd37e940SRob Herring } 87dd37e940SRob Herring 882dc6a016SMarek Szyprowski /** 892dc6a016SMarek Szyprowski * arm_dma_unmap_page - unmap a buffer previously mapped through dma_map_page() 902dc6a016SMarek Szyprowski * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices 912dc6a016SMarek Szyprowski * @handle: DMA address of buffer 922dc6a016SMarek Szyprowski * @size: size of buffer (same as passed to dma_map_page) 932dc6a016SMarek Szyprowski * @dir: DMA transfer direction (same as passed to dma_map_page) 942dc6a016SMarek Szyprowski * 952dc6a016SMarek Szyprowski * Unmap a page streaming mode DMA translation. The handle and size 962dc6a016SMarek Szyprowski * must match what was provided in the previous dma_map_page() call. 972dc6a016SMarek Szyprowski * All other usages are undefined. 982dc6a016SMarek Szyprowski * 992dc6a016SMarek Szyprowski * After this call, reads by the CPU to the buffer are guaranteed to see 1002dc6a016SMarek Szyprowski * whatever the device wrote there. 1012dc6a016SMarek Szyprowski */ 10251fde349SMarek Szyprowski static void arm_dma_unmap_page(struct device *dev, dma_addr_t handle, 1032dc6a016SMarek Szyprowski size_t size, enum dma_data_direction dir, 1042dc6a016SMarek Szyprowski struct dma_attrs *attrs) 1052dc6a016SMarek Szyprowski { 106dd37e940SRob Herring if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) 10751fde349SMarek Szyprowski __dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)), 10851fde349SMarek Szyprowski handle & ~PAGE_MASK, size, dir); 1092dc6a016SMarek Szyprowski } 1102dc6a016SMarek Szyprowski 11151fde349SMarek Szyprowski static void arm_dma_sync_single_for_cpu(struct device *dev, 1122dc6a016SMarek Szyprowski dma_addr_t handle, size_t size, enum dma_data_direction dir) 1132dc6a016SMarek Szyprowski { 1142dc6a016SMarek Szyprowski unsigned int offset = handle & (PAGE_SIZE - 1); 1152dc6a016SMarek Szyprowski struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset)); 1162dc6a016SMarek Szyprowski __dma_page_dev_to_cpu(page, offset, size, dir); 1172dc6a016SMarek Szyprowski } 1182dc6a016SMarek Szyprowski 11951fde349SMarek Szyprowski static void arm_dma_sync_single_for_device(struct device *dev, 1202dc6a016SMarek Szyprowski dma_addr_t handle, size_t size, enum dma_data_direction dir) 1212dc6a016SMarek Szyprowski { 1222dc6a016SMarek Szyprowski unsigned int offset = handle & (PAGE_SIZE - 1); 1232dc6a016SMarek Szyprowski struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset)); 1242dc6a016SMarek Szyprowski __dma_page_cpu_to_dev(page, offset, size, dir); 1252dc6a016SMarek Szyprowski } 1262dc6a016SMarek Szyprowski 1272dc6a016SMarek Szyprowski struct dma_map_ops arm_dma_ops = { 128f99d6034SMarek Szyprowski .alloc = arm_dma_alloc, 129f99d6034SMarek Szyprowski .free = arm_dma_free, 130f99d6034SMarek Szyprowski .mmap = arm_dma_mmap, 131dc2832e1SMarek Szyprowski .get_sgtable = arm_dma_get_sgtable, 1322dc6a016SMarek Szyprowski .map_page = arm_dma_map_page, 1332dc6a016SMarek Szyprowski .unmap_page = arm_dma_unmap_page, 1342dc6a016SMarek Szyprowski .map_sg = arm_dma_map_sg, 1352dc6a016SMarek Szyprowski .unmap_sg = arm_dma_unmap_sg, 1362dc6a016SMarek Szyprowski .sync_single_for_cpu = arm_dma_sync_single_for_cpu, 1372dc6a016SMarek Szyprowski .sync_single_for_device = arm_dma_sync_single_for_device, 1382dc6a016SMarek Szyprowski .sync_sg_for_cpu = arm_dma_sync_sg_for_cpu, 1392dc6a016SMarek Szyprowski .sync_sg_for_device = arm_dma_sync_sg_for_device, 1402dc6a016SMarek Szyprowski .set_dma_mask = arm_dma_set_mask, 1412dc6a016SMarek Szyprowski }; 1422dc6a016SMarek Szyprowski EXPORT_SYMBOL(arm_dma_ops); 1432dc6a016SMarek Szyprowski 144dd37e940SRob Herring static void *arm_coherent_dma_alloc(struct device *dev, size_t size, 145dd37e940SRob Herring dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs); 146dd37e940SRob Herring static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_addr, 147dd37e940SRob Herring dma_addr_t handle, struct dma_attrs *attrs); 148dd37e940SRob Herring 149dd37e940SRob Herring struct dma_map_ops arm_coherent_dma_ops = { 150dd37e940SRob Herring .alloc = arm_coherent_dma_alloc, 151dd37e940SRob Herring .free = arm_coherent_dma_free, 152dd37e940SRob Herring .mmap = arm_dma_mmap, 153dd37e940SRob Herring .get_sgtable = arm_dma_get_sgtable, 154dd37e940SRob Herring .map_page = arm_coherent_dma_map_page, 155dd37e940SRob Herring .map_sg = arm_dma_map_sg, 156dd37e940SRob Herring .set_dma_mask = arm_dma_set_mask, 157dd37e940SRob Herring }; 158dd37e940SRob Herring EXPORT_SYMBOL(arm_coherent_dma_ops); 159dd37e940SRob Herring 160ab6494f0SCatalin Marinas static u64 get_coherent_dma_mask(struct device *dev) 161ab6494f0SCatalin Marinas { 162022ae537SRussell King u64 mask = (u64)arm_dma_limit; 1630ddbccd1SRussell King 164ab6494f0SCatalin Marinas if (dev) { 165ab6494f0SCatalin Marinas mask = dev->coherent_dma_mask; 166ab6494f0SCatalin Marinas 167ab6494f0SCatalin Marinas /* 168ab6494f0SCatalin Marinas * Sanity check the DMA mask - it must be non-zero, and 169ab6494f0SCatalin Marinas * must be able to be satisfied by a DMA allocation. 170ab6494f0SCatalin Marinas */ 171ab6494f0SCatalin Marinas if (mask == 0) { 172ab6494f0SCatalin Marinas dev_warn(dev, "coherent DMA mask is unset\n"); 173ab6494f0SCatalin Marinas return 0; 174ab6494f0SCatalin Marinas } 175ab6494f0SCatalin Marinas 176022ae537SRussell King if ((~mask) & (u64)arm_dma_limit) { 177ab6494f0SCatalin Marinas dev_warn(dev, "coherent DMA mask %#llx is smaller " 178ab6494f0SCatalin Marinas "than system GFP_DMA mask %#llx\n", 179022ae537SRussell King mask, (u64)arm_dma_limit); 180ab6494f0SCatalin Marinas return 0; 181ab6494f0SCatalin Marinas } 182ab6494f0SCatalin Marinas } 183ab6494f0SCatalin Marinas 184ab6494f0SCatalin Marinas return mask; 185ab6494f0SCatalin Marinas } 186ab6494f0SCatalin Marinas 187c7909509SMarek Szyprowski static void __dma_clear_buffer(struct page *page, size_t size) 188c7909509SMarek Szyprowski { 189c7909509SMarek Szyprowski /* 190c7909509SMarek Szyprowski * Ensure that the allocated pages are zeroed, and that any data 191c7909509SMarek Szyprowski * lurking in the kernel direct-mapped region is invalidated. 192c7909509SMarek Szyprowski */ 1939848e48fSMarek Szyprowski if (PageHighMem(page)) { 1949848e48fSMarek Szyprowski phys_addr_t base = __pfn_to_phys(page_to_pfn(page)); 1959848e48fSMarek Szyprowski phys_addr_t end = base + size; 1969848e48fSMarek Szyprowski while (size > 0) { 1979848e48fSMarek Szyprowski void *ptr = kmap_atomic(page); 1989848e48fSMarek Szyprowski memset(ptr, 0, PAGE_SIZE); 1999848e48fSMarek Szyprowski dmac_flush_range(ptr, ptr + PAGE_SIZE); 2009848e48fSMarek Szyprowski kunmap_atomic(ptr); 2019848e48fSMarek Szyprowski page++; 2029848e48fSMarek Szyprowski size -= PAGE_SIZE; 2039848e48fSMarek Szyprowski } 2049848e48fSMarek Szyprowski outer_flush_range(base, end); 2059848e48fSMarek Szyprowski } else { 2069848e48fSMarek Szyprowski void *ptr = page_address(page); 207c7909509SMarek Szyprowski memset(ptr, 0, size); 208c7909509SMarek Szyprowski dmac_flush_range(ptr, ptr + size); 209c7909509SMarek Szyprowski outer_flush_range(__pa(ptr), __pa(ptr) + size); 210c7909509SMarek Szyprowski } 2114ce63fcdSMarek Szyprowski } 212c7909509SMarek Szyprowski 2137a9a32a9SRussell King /* 2147a9a32a9SRussell King * Allocate a DMA buffer for 'dev' of size 'size' using the 2157a9a32a9SRussell King * specified gfp mask. Note that 'size' must be page aligned. 2167a9a32a9SRussell King */ 2177a9a32a9SRussell King static struct page *__dma_alloc_buffer(struct device *dev, size_t size, gfp_t gfp) 2187a9a32a9SRussell King { 2197a9a32a9SRussell King unsigned long order = get_order(size); 2207a9a32a9SRussell King struct page *page, *p, *e; 2217a9a32a9SRussell King 2227a9a32a9SRussell King page = alloc_pages(gfp, order); 2237a9a32a9SRussell King if (!page) 2247a9a32a9SRussell King return NULL; 2257a9a32a9SRussell King 2267a9a32a9SRussell King /* 2277a9a32a9SRussell King * Now split the huge page and free the excess pages 2287a9a32a9SRussell King */ 2297a9a32a9SRussell King split_page(page, order); 2307a9a32a9SRussell King for (p = page + (size >> PAGE_SHIFT), e = page + (1 << order); p < e; p++) 2317a9a32a9SRussell King __free_page(p); 2327a9a32a9SRussell King 233c7909509SMarek Szyprowski __dma_clear_buffer(page, size); 2347a9a32a9SRussell King 2357a9a32a9SRussell King return page; 2367a9a32a9SRussell King } 2377a9a32a9SRussell King 2387a9a32a9SRussell King /* 2397a9a32a9SRussell King * Free a DMA buffer. 'size' must be page aligned. 2407a9a32a9SRussell King */ 2417a9a32a9SRussell King static void __dma_free_buffer(struct page *page, size_t size) 2427a9a32a9SRussell King { 2437a9a32a9SRussell King struct page *e = page + (size >> PAGE_SHIFT); 2447a9a32a9SRussell King 2457a9a32a9SRussell King while (page < e) { 2467a9a32a9SRussell King __free_page(page); 2477a9a32a9SRussell King page++; 2487a9a32a9SRussell King } 2497a9a32a9SRussell King } 2507a9a32a9SRussell King 251ab6494f0SCatalin Marinas #ifdef CONFIG_MMU 2520ddbccd1SRussell King #ifdef CONFIG_HUGETLB_PAGE 2530ddbccd1SRussell King #error ARM Coherent DMA allocator does not (yet) support huge TLB 2540ddbccd1SRussell King #endif 2550ddbccd1SRussell King 256c7909509SMarek Szyprowski static void *__alloc_from_contiguous(struct device *dev, size_t size, 2579848e48fSMarek Szyprowski pgprot_t prot, struct page **ret_page, 2589848e48fSMarek Szyprowski const void *caller); 259c7909509SMarek Szyprowski 260e9da6e99SMarek Szyprowski static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp, 261e9da6e99SMarek Szyprowski pgprot_t prot, struct page **ret_page, 262e9da6e99SMarek Szyprowski const void *caller); 263e9da6e99SMarek Szyprowski 264e9da6e99SMarek Szyprowski static void * 265e9da6e99SMarek Szyprowski __dma_alloc_remap(struct page *page, size_t size, gfp_t gfp, pgprot_t prot, 266e9da6e99SMarek Szyprowski const void *caller) 267e9da6e99SMarek Szyprowski { 268e9da6e99SMarek Szyprowski struct vm_struct *area; 269e9da6e99SMarek Szyprowski unsigned long addr; 270e9da6e99SMarek Szyprowski 271e9da6e99SMarek Szyprowski /* 272e9da6e99SMarek Szyprowski * DMA allocation can be mapped to user space, so lets 273e9da6e99SMarek Szyprowski * set VM_USERMAP flags too. 274e9da6e99SMarek Szyprowski */ 275e9da6e99SMarek Szyprowski area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP, 276e9da6e99SMarek Szyprowski caller); 277e9da6e99SMarek Szyprowski if (!area) 278e9da6e99SMarek Szyprowski return NULL; 279e9da6e99SMarek Szyprowski addr = (unsigned long)area->addr; 280e9da6e99SMarek Szyprowski area->phys_addr = __pfn_to_phys(page_to_pfn(page)); 281e9da6e99SMarek Szyprowski 282e9da6e99SMarek Szyprowski if (ioremap_page_range(addr, addr + size, area->phys_addr, prot)) { 283e9da6e99SMarek Szyprowski vunmap((void *)addr); 284e9da6e99SMarek Szyprowski return NULL; 285e9da6e99SMarek Szyprowski } 286e9da6e99SMarek Szyprowski return (void *)addr; 287e9da6e99SMarek Szyprowski } 288e9da6e99SMarek Szyprowski 289e9da6e99SMarek Szyprowski static void __dma_free_remap(void *cpu_addr, size_t size) 290e9da6e99SMarek Szyprowski { 291e9da6e99SMarek Szyprowski unsigned int flags = VM_ARM_DMA_CONSISTENT | VM_USERMAP; 292e9da6e99SMarek Szyprowski struct vm_struct *area = find_vm_area(cpu_addr); 293e9da6e99SMarek Szyprowski if (!area || (area->flags & flags) != flags) { 294e9da6e99SMarek Szyprowski WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr); 295e9da6e99SMarek Szyprowski return; 296e9da6e99SMarek Szyprowski } 297e9da6e99SMarek Szyprowski unmap_kernel_range((unsigned long)cpu_addr, size); 298e9da6e99SMarek Szyprowski vunmap(cpu_addr); 299e9da6e99SMarek Szyprowski } 300e9da6e99SMarek Szyprowski 3016e5267aaSMarek Szyprowski #define DEFAULT_DMA_COHERENT_POOL_SIZE SZ_256K 3026e5267aaSMarek Szyprowski 303e9da6e99SMarek Szyprowski struct dma_pool { 304e9da6e99SMarek Szyprowski size_t size; 305e9da6e99SMarek Szyprowski spinlock_t lock; 306e9da6e99SMarek Szyprowski unsigned long *bitmap; 307e9da6e99SMarek Szyprowski unsigned long nr_pages; 308e9da6e99SMarek Szyprowski void *vaddr; 3096b3fe472SHiroshi Doyu struct page **pages; 310c7909509SMarek Szyprowski }; 311c7909509SMarek Szyprowski 312e9da6e99SMarek Szyprowski static struct dma_pool atomic_pool = { 3136e5267aaSMarek Szyprowski .size = DEFAULT_DMA_COHERENT_POOL_SIZE, 314e9da6e99SMarek Szyprowski }; 315c7909509SMarek Szyprowski 316c7909509SMarek Szyprowski static int __init early_coherent_pool(char *p) 317c7909509SMarek Szyprowski { 318e9da6e99SMarek Szyprowski atomic_pool.size = memparse(p, &p); 319c7909509SMarek Szyprowski return 0; 320c7909509SMarek Szyprowski } 321c7909509SMarek Szyprowski early_param("coherent_pool", early_coherent_pool); 322c7909509SMarek Szyprowski 3236e5267aaSMarek Szyprowski void __init init_dma_coherent_pool_size(unsigned long size) 3246e5267aaSMarek Szyprowski { 3256e5267aaSMarek Szyprowski /* 3266e5267aaSMarek Szyprowski * Catch any attempt to set the pool size too late. 3276e5267aaSMarek Szyprowski */ 3286e5267aaSMarek Szyprowski BUG_ON(atomic_pool.vaddr); 3296e5267aaSMarek Szyprowski 3306e5267aaSMarek Szyprowski /* 3316e5267aaSMarek Szyprowski * Set architecture specific coherent pool size only if 3326e5267aaSMarek Szyprowski * it has not been changed by kernel command line parameter. 3336e5267aaSMarek Szyprowski */ 3346e5267aaSMarek Szyprowski if (atomic_pool.size == DEFAULT_DMA_COHERENT_POOL_SIZE) 3356e5267aaSMarek Szyprowski atomic_pool.size = size; 3366e5267aaSMarek Szyprowski } 3376e5267aaSMarek Szyprowski 338c7909509SMarek Szyprowski /* 339c7909509SMarek Szyprowski * Initialise the coherent pool for atomic allocations. 340c7909509SMarek Szyprowski */ 341e9da6e99SMarek Szyprowski static int __init atomic_pool_init(void) 342c7909509SMarek Szyprowski { 343e9da6e99SMarek Szyprowski struct dma_pool *pool = &atomic_pool; 344c7909509SMarek Szyprowski pgprot_t prot = pgprot_dmacoherent(pgprot_kernel); 345e9da6e99SMarek Szyprowski unsigned long nr_pages = pool->size >> PAGE_SHIFT; 346e9da6e99SMarek Szyprowski unsigned long *bitmap; 347c7909509SMarek Szyprowski struct page *page; 3486b3fe472SHiroshi Doyu struct page **pages; 349c7909509SMarek Szyprowski void *ptr; 350e9da6e99SMarek Szyprowski int bitmap_size = BITS_TO_LONGS(nr_pages) * sizeof(long); 351c7909509SMarek Szyprowski 352e9da6e99SMarek Szyprowski bitmap = kzalloc(bitmap_size, GFP_KERNEL); 353e9da6e99SMarek Szyprowski if (!bitmap) 354e9da6e99SMarek Szyprowski goto no_bitmap; 355c7909509SMarek Szyprowski 3566b3fe472SHiroshi Doyu pages = kzalloc(nr_pages * sizeof(struct page *), GFP_KERNEL); 3576b3fe472SHiroshi Doyu if (!pages) 3586b3fe472SHiroshi Doyu goto no_pages; 3596b3fe472SHiroshi Doyu 360e9da6e99SMarek Szyprowski if (IS_ENABLED(CONFIG_CMA)) 3619848e48fSMarek Szyprowski ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page, 3629848e48fSMarek Szyprowski atomic_pool_init); 363e9da6e99SMarek Szyprowski else 364e9da6e99SMarek Szyprowski ptr = __alloc_remap_buffer(NULL, pool->size, GFP_KERNEL, prot, 3659848e48fSMarek Szyprowski &page, atomic_pool_init); 366c7909509SMarek Szyprowski if (ptr) { 3676b3fe472SHiroshi Doyu int i; 3686b3fe472SHiroshi Doyu 3696b3fe472SHiroshi Doyu for (i = 0; i < nr_pages; i++) 3706b3fe472SHiroshi Doyu pages[i] = page + i; 3716b3fe472SHiroshi Doyu 372e9da6e99SMarek Szyprowski spin_lock_init(&pool->lock); 373e9da6e99SMarek Szyprowski pool->vaddr = ptr; 3746b3fe472SHiroshi Doyu pool->pages = pages; 375e9da6e99SMarek Szyprowski pool->bitmap = bitmap; 376e9da6e99SMarek Szyprowski pool->nr_pages = nr_pages; 377e9da6e99SMarek Szyprowski pr_info("DMA: preallocated %u KiB pool for atomic coherent allocations\n", 378e9da6e99SMarek Szyprowski (unsigned)pool->size / 1024); 379c7909509SMarek Szyprowski return 0; 380c7909509SMarek Szyprowski } 381ec10665cSSachin Kamat 382ec10665cSSachin Kamat kfree(pages); 3836b3fe472SHiroshi Doyu no_pages: 384e9da6e99SMarek Szyprowski kfree(bitmap); 385e9da6e99SMarek Szyprowski no_bitmap: 386e9da6e99SMarek Szyprowski pr_err("DMA: failed to allocate %u KiB pool for atomic coherent allocation\n", 387e9da6e99SMarek Szyprowski (unsigned)pool->size / 1024); 388c7909509SMarek Szyprowski return -ENOMEM; 389c7909509SMarek Szyprowski } 390c7909509SMarek Szyprowski /* 391c7909509SMarek Szyprowski * CMA is activated by core_initcall, so we must be called after it. 392c7909509SMarek Szyprowski */ 393e9da6e99SMarek Szyprowski postcore_initcall(atomic_pool_init); 394c7909509SMarek Szyprowski 395c7909509SMarek Szyprowski struct dma_contig_early_reserve { 396c7909509SMarek Szyprowski phys_addr_t base; 397c7909509SMarek Szyprowski unsigned long size; 398c7909509SMarek Szyprowski }; 399c7909509SMarek Szyprowski 400c7909509SMarek Szyprowski static struct dma_contig_early_reserve dma_mmu_remap[MAX_CMA_AREAS] __initdata; 401c7909509SMarek Szyprowski 402c7909509SMarek Szyprowski static int dma_mmu_remap_num __initdata; 403c7909509SMarek Szyprowski 404c7909509SMarek Szyprowski void __init dma_contiguous_early_fixup(phys_addr_t base, unsigned long size) 405c7909509SMarek Szyprowski { 406c7909509SMarek Szyprowski dma_mmu_remap[dma_mmu_remap_num].base = base; 407c7909509SMarek Szyprowski dma_mmu_remap[dma_mmu_remap_num].size = size; 408c7909509SMarek Szyprowski dma_mmu_remap_num++; 409c7909509SMarek Szyprowski } 410c7909509SMarek Szyprowski 411c7909509SMarek Szyprowski void __init dma_contiguous_remap(void) 412c7909509SMarek Szyprowski { 413c7909509SMarek Szyprowski int i; 414c7909509SMarek Szyprowski for (i = 0; i < dma_mmu_remap_num; i++) { 415c7909509SMarek Szyprowski phys_addr_t start = dma_mmu_remap[i].base; 416c7909509SMarek Szyprowski phys_addr_t end = start + dma_mmu_remap[i].size; 417c7909509SMarek Szyprowski struct map_desc map; 418c7909509SMarek Szyprowski unsigned long addr; 419c7909509SMarek Szyprowski 420c7909509SMarek Szyprowski if (end > arm_lowmem_limit) 421c7909509SMarek Szyprowski end = arm_lowmem_limit; 422c7909509SMarek Szyprowski if (start >= end) 42339f78e70SChris Brand continue; 424c7909509SMarek Szyprowski 425c7909509SMarek Szyprowski map.pfn = __phys_to_pfn(start); 426c7909509SMarek Szyprowski map.virtual = __phys_to_virt(start); 427c7909509SMarek Szyprowski map.length = end - start; 428c7909509SMarek Szyprowski map.type = MT_MEMORY_DMA_READY; 429c7909509SMarek Szyprowski 430c7909509SMarek Szyprowski /* 431c7909509SMarek Szyprowski * Clear previous low-memory mapping 432c7909509SMarek Szyprowski */ 433c7909509SMarek Szyprowski for (addr = __phys_to_virt(start); addr < __phys_to_virt(end); 43461f6c7a4SVitaly Andrianov addr += PMD_SIZE) 435c7909509SMarek Szyprowski pmd_clear(pmd_off_k(addr)); 436c7909509SMarek Szyprowski 437c7909509SMarek Szyprowski iotable_init(&map, 1); 438c7909509SMarek Szyprowski } 439c7909509SMarek Szyprowski } 440c7909509SMarek Szyprowski 441c7909509SMarek Szyprowski static int __dma_update_pte(pte_t *pte, pgtable_t token, unsigned long addr, 442c7909509SMarek Szyprowski void *data) 443c7909509SMarek Szyprowski { 444c7909509SMarek Szyprowski struct page *page = virt_to_page(addr); 445c7909509SMarek Szyprowski pgprot_t prot = *(pgprot_t *)data; 446c7909509SMarek Szyprowski 447c7909509SMarek Szyprowski set_pte_ext(pte, mk_pte(page, prot), 0); 448c7909509SMarek Szyprowski return 0; 449c7909509SMarek Szyprowski } 450c7909509SMarek Szyprowski 451c7909509SMarek Szyprowski static void __dma_remap(struct page *page, size_t size, pgprot_t prot) 452c7909509SMarek Szyprowski { 453c7909509SMarek Szyprowski unsigned long start = (unsigned long) page_address(page); 454c7909509SMarek Szyprowski unsigned end = start + size; 455c7909509SMarek Szyprowski 456c7909509SMarek Szyprowski apply_to_page_range(&init_mm, start, size, __dma_update_pte, &prot); 457c7909509SMarek Szyprowski dsb(); 458c7909509SMarek Szyprowski flush_tlb_kernel_range(start, end); 459c7909509SMarek Szyprowski } 460c7909509SMarek Szyprowski 461c7909509SMarek Szyprowski static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp, 462c7909509SMarek Szyprowski pgprot_t prot, struct page **ret_page, 463c7909509SMarek Szyprowski const void *caller) 464c7909509SMarek Szyprowski { 465c7909509SMarek Szyprowski struct page *page; 466c7909509SMarek Szyprowski void *ptr; 467c7909509SMarek Szyprowski page = __dma_alloc_buffer(dev, size, gfp); 468c7909509SMarek Szyprowski if (!page) 469c7909509SMarek Szyprowski return NULL; 470c7909509SMarek Szyprowski 471c7909509SMarek Szyprowski ptr = __dma_alloc_remap(page, size, gfp, prot, caller); 472c7909509SMarek Szyprowski if (!ptr) { 473c7909509SMarek Szyprowski __dma_free_buffer(page, size); 474c7909509SMarek Szyprowski return NULL; 475c7909509SMarek Szyprowski } 476c7909509SMarek Szyprowski 477c7909509SMarek Szyprowski *ret_page = page; 478c7909509SMarek Szyprowski return ptr; 479c7909509SMarek Szyprowski } 480c7909509SMarek Szyprowski 481e9da6e99SMarek Szyprowski static void *__alloc_from_pool(size_t size, struct page **ret_page) 482c7909509SMarek Szyprowski { 483e9da6e99SMarek Szyprowski struct dma_pool *pool = &atomic_pool; 484e9da6e99SMarek Szyprowski unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; 485e9da6e99SMarek Szyprowski unsigned int pageno; 486e9da6e99SMarek Szyprowski unsigned long flags; 487e9da6e99SMarek Szyprowski void *ptr = NULL; 488e4ea6918SAaro Koskinen unsigned long align_mask; 489c7909509SMarek Szyprowski 490e9da6e99SMarek Szyprowski if (!pool->vaddr) { 491e9da6e99SMarek Szyprowski WARN(1, "coherent pool not initialised!\n"); 492c7909509SMarek Szyprowski return NULL; 493c7909509SMarek Szyprowski } 494c7909509SMarek Szyprowski 495c7909509SMarek Szyprowski /* 496c7909509SMarek Szyprowski * Align the region allocation - allocations from pool are rather 497c7909509SMarek Szyprowski * small, so align them to their order in pages, minimum is a page 498c7909509SMarek Szyprowski * size. This helps reduce fragmentation of the DMA space. 499c7909509SMarek Szyprowski */ 500e4ea6918SAaro Koskinen align_mask = (1 << get_order(size)) - 1; 501e9da6e99SMarek Szyprowski 502e9da6e99SMarek Szyprowski spin_lock_irqsave(&pool->lock, flags); 503e9da6e99SMarek Szyprowski pageno = bitmap_find_next_zero_area(pool->bitmap, pool->nr_pages, 504e4ea6918SAaro Koskinen 0, count, align_mask); 505e9da6e99SMarek Szyprowski if (pageno < pool->nr_pages) { 506e9da6e99SMarek Szyprowski bitmap_set(pool->bitmap, pageno, count); 507e9da6e99SMarek Szyprowski ptr = pool->vaddr + PAGE_SIZE * pageno; 5086b3fe472SHiroshi Doyu *ret_page = pool->pages[pageno]; 509fb71285fSMarek Szyprowski } else { 510fb71285fSMarek Szyprowski pr_err_once("ERROR: %u KiB atomic DMA coherent pool is too small!\n" 511fb71285fSMarek Szyprowski "Please increase it with coherent_pool= kernel parameter!\n", 512fb71285fSMarek Szyprowski (unsigned)pool->size / 1024); 513e9da6e99SMarek Szyprowski } 514e9da6e99SMarek Szyprowski spin_unlock_irqrestore(&pool->lock, flags); 515e9da6e99SMarek Szyprowski 516c7909509SMarek Szyprowski return ptr; 517c7909509SMarek Szyprowski } 518c7909509SMarek Szyprowski 51921d0a759SHiroshi Doyu static bool __in_atomic_pool(void *start, size_t size) 52021d0a759SHiroshi Doyu { 52121d0a759SHiroshi Doyu struct dma_pool *pool = &atomic_pool; 52221d0a759SHiroshi Doyu void *end = start + size; 52321d0a759SHiroshi Doyu void *pool_start = pool->vaddr; 52421d0a759SHiroshi Doyu void *pool_end = pool->vaddr + pool->size; 52521d0a759SHiroshi Doyu 526f3d87524SThomas Petazzoni if (start < pool_start || start >= pool_end) 52721d0a759SHiroshi Doyu return false; 52821d0a759SHiroshi Doyu 52921d0a759SHiroshi Doyu if (end <= pool_end) 53021d0a759SHiroshi Doyu return true; 53121d0a759SHiroshi Doyu 53221d0a759SHiroshi Doyu WARN(1, "Wrong coherent size(%p-%p) from atomic pool(%p-%p)\n", 53321d0a759SHiroshi Doyu start, end - 1, pool_start, pool_end - 1); 53421d0a759SHiroshi Doyu 53521d0a759SHiroshi Doyu return false; 53621d0a759SHiroshi Doyu } 53721d0a759SHiroshi Doyu 538e9da6e99SMarek Szyprowski static int __free_from_pool(void *start, size_t size) 539c7909509SMarek Szyprowski { 540e9da6e99SMarek Szyprowski struct dma_pool *pool = &atomic_pool; 541e9da6e99SMarek Szyprowski unsigned long pageno, count; 542e9da6e99SMarek Szyprowski unsigned long flags; 543c7909509SMarek Szyprowski 54421d0a759SHiroshi Doyu if (!__in_atomic_pool(start, size)) 545c7909509SMarek Szyprowski return 0; 546c7909509SMarek Szyprowski 547e9da6e99SMarek Szyprowski pageno = (start - pool->vaddr) >> PAGE_SHIFT; 548e9da6e99SMarek Szyprowski count = size >> PAGE_SHIFT; 549e9da6e99SMarek Szyprowski 550e9da6e99SMarek Szyprowski spin_lock_irqsave(&pool->lock, flags); 551e9da6e99SMarek Szyprowski bitmap_clear(pool->bitmap, pageno, count); 552e9da6e99SMarek Szyprowski spin_unlock_irqrestore(&pool->lock, flags); 553e9da6e99SMarek Szyprowski 554c7909509SMarek Szyprowski return 1; 555c7909509SMarek Szyprowski } 556c7909509SMarek Szyprowski 557c7909509SMarek Szyprowski static void *__alloc_from_contiguous(struct device *dev, size_t size, 5589848e48fSMarek Szyprowski pgprot_t prot, struct page **ret_page, 5599848e48fSMarek Szyprowski const void *caller) 560c7909509SMarek Szyprowski { 561c7909509SMarek Szyprowski unsigned long order = get_order(size); 562c7909509SMarek Szyprowski size_t count = size >> PAGE_SHIFT; 563c7909509SMarek Szyprowski struct page *page; 5649848e48fSMarek Szyprowski void *ptr; 565c7909509SMarek Szyprowski 566c7909509SMarek Szyprowski page = dma_alloc_from_contiguous(dev, count, order); 567c7909509SMarek Szyprowski if (!page) 568c7909509SMarek Szyprowski return NULL; 569c7909509SMarek Szyprowski 570c7909509SMarek Szyprowski __dma_clear_buffer(page, size); 571c7909509SMarek Szyprowski 5729848e48fSMarek Szyprowski if (PageHighMem(page)) { 5739848e48fSMarek Szyprowski ptr = __dma_alloc_remap(page, size, GFP_KERNEL, prot, caller); 5749848e48fSMarek Szyprowski if (!ptr) { 5759848e48fSMarek Szyprowski dma_release_from_contiguous(dev, page, count); 5769848e48fSMarek Szyprowski return NULL; 5779848e48fSMarek Szyprowski } 5789848e48fSMarek Szyprowski } else { 5799848e48fSMarek Szyprowski __dma_remap(page, size, prot); 5809848e48fSMarek Szyprowski ptr = page_address(page); 5819848e48fSMarek Szyprowski } 582c7909509SMarek Szyprowski *ret_page = page; 5839848e48fSMarek Szyprowski return ptr; 584c7909509SMarek Szyprowski } 585c7909509SMarek Szyprowski 586c7909509SMarek Szyprowski static void __free_from_contiguous(struct device *dev, struct page *page, 5879848e48fSMarek Szyprowski void *cpu_addr, size_t size) 588c7909509SMarek Szyprowski { 5899848e48fSMarek Szyprowski if (PageHighMem(page)) 5909848e48fSMarek Szyprowski __dma_free_remap(cpu_addr, size); 5919848e48fSMarek Szyprowski else 592c7909509SMarek Szyprowski __dma_remap(page, size, pgprot_kernel); 593c7909509SMarek Szyprowski dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT); 594c7909509SMarek Szyprowski } 595c7909509SMarek Szyprowski 596f99d6034SMarek Szyprowski static inline pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot) 597f99d6034SMarek Szyprowski { 598f99d6034SMarek Szyprowski prot = dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs) ? 599f99d6034SMarek Szyprowski pgprot_writecombine(prot) : 600f99d6034SMarek Szyprowski pgprot_dmacoherent(prot); 601f99d6034SMarek Szyprowski return prot; 602f99d6034SMarek Szyprowski } 603f99d6034SMarek Szyprowski 604c7909509SMarek Szyprowski #define nommu() 0 605c7909509SMarek Szyprowski 606ab6494f0SCatalin Marinas #else /* !CONFIG_MMU */ 607695ae0afSRussell King 608c7909509SMarek Szyprowski #define nommu() 1 609c7909509SMarek Szyprowski 610f99d6034SMarek Szyprowski #define __get_dma_pgprot(attrs, prot) __pgprot(0) 611c7909509SMarek Szyprowski #define __alloc_remap_buffer(dev, size, gfp, prot, ret, c) NULL 612e9da6e99SMarek Szyprowski #define __alloc_from_pool(size, ret_page) NULL 6139848e48fSMarek Szyprowski #define __alloc_from_contiguous(dev, size, prot, ret, c) NULL 614c7909509SMarek Szyprowski #define __free_from_pool(cpu_addr, size) 0 6159848e48fSMarek Szyprowski #define __free_from_contiguous(dev, page, cpu_addr, size) do { } while (0) 616c7909509SMarek Szyprowski #define __dma_free_remap(cpu_addr, size) do { } while (0) 61731ebf944SRussell King 61831ebf944SRussell King #endif /* CONFIG_MMU */ 61931ebf944SRussell King 620c7909509SMarek Szyprowski static void *__alloc_simple_buffer(struct device *dev, size_t size, gfp_t gfp, 621c7909509SMarek Szyprowski struct page **ret_page) 622ab6494f0SCatalin Marinas { 62304da5694SRussell King struct page *page; 624c7909509SMarek Szyprowski page = __dma_alloc_buffer(dev, size, gfp); 625c7909509SMarek Szyprowski if (!page) 626c7909509SMarek Szyprowski return NULL; 627c7909509SMarek Szyprowski 628c7909509SMarek Szyprowski *ret_page = page; 629c7909509SMarek Szyprowski return page_address(page); 630c7909509SMarek Szyprowski } 631c7909509SMarek Szyprowski 632c7909509SMarek Szyprowski 633c7909509SMarek Szyprowski 634c7909509SMarek Szyprowski static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, 635dd37e940SRob Herring gfp_t gfp, pgprot_t prot, bool is_coherent, const void *caller) 636c7909509SMarek Szyprowski { 637c7909509SMarek Szyprowski u64 mask = get_coherent_dma_mask(dev); 6383dd7ea92SJingoo Han struct page *page = NULL; 63931ebf944SRussell King void *addr; 640ab6494f0SCatalin Marinas 641c7909509SMarek Szyprowski #ifdef CONFIG_DMA_API_DEBUG 642c7909509SMarek Szyprowski u64 limit = (mask + 1) & ~mask; 643c7909509SMarek Szyprowski if (limit && size >= limit) { 644c7909509SMarek Szyprowski dev_warn(dev, "coherent allocation too big (requested %#x mask %#llx)\n", 645c7909509SMarek Szyprowski size, mask); 646c7909509SMarek Szyprowski return NULL; 647c7909509SMarek Szyprowski } 648c7909509SMarek Szyprowski #endif 649c7909509SMarek Szyprowski 650c7909509SMarek Szyprowski if (!mask) 651c7909509SMarek Szyprowski return NULL; 652c7909509SMarek Szyprowski 653c7909509SMarek Szyprowski if (mask < 0xffffffffULL) 654c7909509SMarek Szyprowski gfp |= GFP_DMA; 655c7909509SMarek Szyprowski 656ea2e7057SSumit Bhattacharya /* 657ea2e7057SSumit Bhattacharya * Following is a work-around (a.k.a. hack) to prevent pages 658ea2e7057SSumit Bhattacharya * with __GFP_COMP being passed to split_page() which cannot 659ea2e7057SSumit Bhattacharya * handle them. The real problem is that this flag probably 660ea2e7057SSumit Bhattacharya * should be 0 on ARM as it is not supported on this 661ea2e7057SSumit Bhattacharya * platform; see CONFIG_HUGETLBFS. 662ea2e7057SSumit Bhattacharya */ 663ea2e7057SSumit Bhattacharya gfp &= ~(__GFP_COMP); 664ea2e7057SSumit Bhattacharya 665553ac788SMarek Szyprowski *handle = DMA_ERROR_CODE; 66604da5694SRussell King size = PAGE_ALIGN(size); 66704da5694SRussell King 668dd37e940SRob Herring if (is_coherent || nommu()) 669c7909509SMarek Szyprowski addr = __alloc_simple_buffer(dev, size, gfp, &page); 670633dc92aSRussell King else if (!(gfp & __GFP_WAIT)) 671e9da6e99SMarek Szyprowski addr = __alloc_from_pool(size, &page); 672f1ae98daSMarek Szyprowski else if (!IS_ENABLED(CONFIG_CMA)) 673c7909509SMarek Szyprowski addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller); 67431ebf944SRussell King else 6759848e48fSMarek Szyprowski addr = __alloc_from_contiguous(dev, size, prot, &page, caller); 67631ebf944SRussell King 67731ebf944SRussell King if (addr) 6789eedd963SRussell King *handle = pfn_to_dma(dev, page_to_pfn(page)); 67931ebf944SRussell King 68031ebf944SRussell King return addr; 681ab6494f0SCatalin Marinas } 682695ae0afSRussell King 6830ddbccd1SRussell King /* 6840ddbccd1SRussell King * Allocate DMA-coherent memory space and return both the kernel remapped 6850ddbccd1SRussell King * virtual and bus address for that space. 6860ddbccd1SRussell King */ 687f99d6034SMarek Szyprowski void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, 688f99d6034SMarek Szyprowski gfp_t gfp, struct dma_attrs *attrs) 6890ddbccd1SRussell King { 690f99d6034SMarek Szyprowski pgprot_t prot = __get_dma_pgprot(attrs, pgprot_kernel); 6910ddbccd1SRussell King void *memory; 6920ddbccd1SRussell King 6930ddbccd1SRussell King if (dma_alloc_from_coherent(dev, size, handle, &memory)) 6940ddbccd1SRussell King return memory; 6950ddbccd1SRussell King 696dd37e940SRob Herring return __dma_alloc(dev, size, handle, gfp, prot, false, 697dd37e940SRob Herring __builtin_return_address(0)); 698dd37e940SRob Herring } 699dd37e940SRob Herring 700dd37e940SRob Herring static void *arm_coherent_dma_alloc(struct device *dev, size_t size, 701dd37e940SRob Herring dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs) 702dd37e940SRob Herring { 703dd37e940SRob Herring pgprot_t prot = __get_dma_pgprot(attrs, pgprot_kernel); 704dd37e940SRob Herring void *memory; 705dd37e940SRob Herring 706dd37e940SRob Herring if (dma_alloc_from_coherent(dev, size, handle, &memory)) 707dd37e940SRob Herring return memory; 708dd37e940SRob Herring 709dd37e940SRob Herring return __dma_alloc(dev, size, handle, gfp, prot, true, 71045cd5290SRussell King __builtin_return_address(0)); 7110ddbccd1SRussell King } 7120ddbccd1SRussell King 7130ddbccd1SRussell King /* 714f99d6034SMarek Szyprowski * Create userspace mapping for the DMA-coherent memory. 7150ddbccd1SRussell King */ 716f99d6034SMarek Szyprowski int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma, 717f99d6034SMarek Szyprowski void *cpu_addr, dma_addr_t dma_addr, size_t size, 718f99d6034SMarek Szyprowski struct dma_attrs *attrs) 7190ddbccd1SRussell King { 720ab6494f0SCatalin Marinas int ret = -ENXIO; 721ab6494f0SCatalin Marinas #ifdef CONFIG_MMU 72250262a4bSMarek Szyprowski unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; 72350262a4bSMarek Szyprowski unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; 724c7909509SMarek Szyprowski unsigned long pfn = dma_to_pfn(dev, dma_addr); 72550262a4bSMarek Szyprowski unsigned long off = vma->vm_pgoff; 72650262a4bSMarek Szyprowski 727f99d6034SMarek Szyprowski vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot); 728f99d6034SMarek Szyprowski 72947142f07SMarek Szyprowski if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret)) 73047142f07SMarek Szyprowski return ret; 73147142f07SMarek Szyprowski 73250262a4bSMarek Szyprowski if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) { 7330ddbccd1SRussell King ret = remap_pfn_range(vma, vma->vm_start, 73450262a4bSMarek Szyprowski pfn + off, 735c7909509SMarek Szyprowski vma->vm_end - vma->vm_start, 7360ddbccd1SRussell King vma->vm_page_prot); 73750262a4bSMarek Szyprowski } 738ab6494f0SCatalin Marinas #endif /* CONFIG_MMU */ 7390ddbccd1SRussell King 7400ddbccd1SRussell King return ret; 7410ddbccd1SRussell King } 7420ddbccd1SRussell King 7430ddbccd1SRussell King /* 744c7909509SMarek Szyprowski * Free a buffer as defined by the above mapping. 7450ddbccd1SRussell King */ 746dd37e940SRob Herring static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr, 747dd37e940SRob Herring dma_addr_t handle, struct dma_attrs *attrs, 748dd37e940SRob Herring bool is_coherent) 7490ddbccd1SRussell King { 750c7909509SMarek Szyprowski struct page *page = pfn_to_page(dma_to_pfn(dev, handle)); 7510ddbccd1SRussell King 7520ddbccd1SRussell King if (dma_release_from_coherent(dev, get_order(size), cpu_addr)) 7530ddbccd1SRussell King return; 7540ddbccd1SRussell King 7553e82d012SRussell King size = PAGE_ALIGN(size); 7563e82d012SRussell King 757dd37e940SRob Herring if (is_coherent || nommu()) { 758c7909509SMarek Szyprowski __dma_free_buffer(page, size); 759d9e0d149SAaro Koskinen } else if (__free_from_pool(cpu_addr, size)) { 760d9e0d149SAaro Koskinen return; 761f1ae98daSMarek Szyprowski } else if (!IS_ENABLED(CONFIG_CMA)) { 762695ae0afSRussell King __dma_free_remap(cpu_addr, size); 763c7909509SMarek Szyprowski __dma_free_buffer(page, size); 764c7909509SMarek Szyprowski } else { 765c7909509SMarek Szyprowski /* 766c7909509SMarek Szyprowski * Non-atomic allocations cannot be freed with IRQs disabled 767c7909509SMarek Szyprowski */ 768c7909509SMarek Szyprowski WARN_ON(irqs_disabled()); 7699848e48fSMarek Szyprowski __free_from_contiguous(dev, page, cpu_addr, size); 770c7909509SMarek Szyprowski } 7710ddbccd1SRussell King } 772afd1a321SRussell King 773dd37e940SRob Herring void arm_dma_free(struct device *dev, size_t size, void *cpu_addr, 774dd37e940SRob Herring dma_addr_t handle, struct dma_attrs *attrs) 775dd37e940SRob Herring { 776dd37e940SRob Herring __arm_dma_free(dev, size, cpu_addr, handle, attrs, false); 777dd37e940SRob Herring } 778dd37e940SRob Herring 779dd37e940SRob Herring static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_addr, 780dd37e940SRob Herring dma_addr_t handle, struct dma_attrs *attrs) 781dd37e940SRob Herring { 782dd37e940SRob Herring __arm_dma_free(dev, size, cpu_addr, handle, attrs, true); 783dd37e940SRob Herring } 784dd37e940SRob Herring 785dc2832e1SMarek Szyprowski int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt, 786dc2832e1SMarek Szyprowski void *cpu_addr, dma_addr_t handle, size_t size, 787dc2832e1SMarek Szyprowski struct dma_attrs *attrs) 788dc2832e1SMarek Szyprowski { 789dc2832e1SMarek Szyprowski struct page *page = pfn_to_page(dma_to_pfn(dev, handle)); 790dc2832e1SMarek Szyprowski int ret; 791dc2832e1SMarek Szyprowski 792dc2832e1SMarek Szyprowski ret = sg_alloc_table(sgt, 1, GFP_KERNEL); 793dc2832e1SMarek Szyprowski if (unlikely(ret)) 794dc2832e1SMarek Szyprowski return ret; 795dc2832e1SMarek Szyprowski 796dc2832e1SMarek Szyprowski sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); 797dc2832e1SMarek Szyprowski return 0; 798dc2832e1SMarek Szyprowski } 799dc2832e1SMarek Szyprowski 80065af191aSRussell King static void dma_cache_maint_page(struct page *page, unsigned long offset, 801a9c9147eSRussell King size_t size, enum dma_data_direction dir, 802a9c9147eSRussell King void (*op)(const void *, size_t, int)) 80365af191aSRussell King { 80415653371SRussell King unsigned long pfn; 80515653371SRussell King size_t left = size; 80615653371SRussell King 80715653371SRussell King pfn = page_to_pfn(page) + offset / PAGE_SIZE; 80815653371SRussell King offset %= PAGE_SIZE; 80915653371SRussell King 81065af191aSRussell King /* 81165af191aSRussell King * A single sg entry may refer to multiple physically contiguous 81265af191aSRussell King * pages. But we still need to process highmem pages individually. 81365af191aSRussell King * If highmem is not configured then the bulk of this loop gets 81465af191aSRussell King * optimized out. 81565af191aSRussell King */ 81665af191aSRussell King do { 81765af191aSRussell King size_t len = left; 81893f1d629SRussell King void *vaddr; 81993f1d629SRussell King 82015653371SRussell King page = pfn_to_page(pfn); 82115653371SRussell King 82293f1d629SRussell King if (PageHighMem(page)) { 82315653371SRussell King if (len + offset > PAGE_SIZE) 82465af191aSRussell King len = PAGE_SIZE - offset; 82593f1d629SRussell King vaddr = kmap_high_get(page); 82693f1d629SRussell King if (vaddr) { 82793f1d629SRussell King vaddr += offset; 828a9c9147eSRussell King op(vaddr, len, dir); 82993f1d629SRussell King kunmap_high(page); 8307e5a69e8SNicolas Pitre } else if (cache_is_vipt()) { 83139af22a7SNicolas Pitre /* unmapped pages might still be cached */ 83239af22a7SNicolas Pitre vaddr = kmap_atomic(page); 8337e5a69e8SNicolas Pitre op(vaddr + offset, len, dir); 83439af22a7SNicolas Pitre kunmap_atomic(vaddr); 83593f1d629SRussell King } 83693f1d629SRussell King } else { 83793f1d629SRussell King vaddr = page_address(page) + offset; 838a9c9147eSRussell King op(vaddr, len, dir); 83993f1d629SRussell King } 84065af191aSRussell King offset = 0; 84115653371SRussell King pfn++; 84265af191aSRussell King left -= len; 84365af191aSRussell King } while (left); 84465af191aSRussell King } 84565af191aSRussell King 84651fde349SMarek Szyprowski /* 84751fde349SMarek Szyprowski * Make an area consistent for devices. 84851fde349SMarek Szyprowski * Note: Drivers should NOT use this function directly, as it will break 84951fde349SMarek Szyprowski * platforms with CONFIG_DMABOUNCE. 85051fde349SMarek Szyprowski * Use the driver DMA support - see dma-mapping.h (dma_sync_*) 85151fde349SMarek Szyprowski */ 85251fde349SMarek Szyprowski static void __dma_page_cpu_to_dev(struct page *page, unsigned long off, 85365af191aSRussell King size_t size, enum dma_data_direction dir) 85465af191aSRussell King { 85543377453SNicolas Pitre unsigned long paddr; 85643377453SNicolas Pitre 857a9c9147eSRussell King dma_cache_maint_page(page, off, size, dir, dmac_map_area); 85843377453SNicolas Pitre 85965af191aSRussell King paddr = page_to_phys(page) + off; 8602ffe2da3SRussell King if (dir == DMA_FROM_DEVICE) { 8612ffe2da3SRussell King outer_inv_range(paddr, paddr + size); 8622ffe2da3SRussell King } else { 8632ffe2da3SRussell King outer_clean_range(paddr, paddr + size); 8642ffe2da3SRussell King } 8652ffe2da3SRussell King /* FIXME: non-speculating: flush on bidirectional mappings? */ 86643377453SNicolas Pitre } 8674ea0d737SRussell King 86851fde349SMarek Szyprowski static void __dma_page_dev_to_cpu(struct page *page, unsigned long off, 8694ea0d737SRussell King size_t size, enum dma_data_direction dir) 8704ea0d737SRussell King { 8712ffe2da3SRussell King unsigned long paddr = page_to_phys(page) + off; 8722ffe2da3SRussell King 8732ffe2da3SRussell King /* FIXME: non-speculating: not required */ 8742ffe2da3SRussell King /* don't bother invalidating if DMA to device */ 8752ffe2da3SRussell King if (dir != DMA_TO_DEVICE) 8762ffe2da3SRussell King outer_inv_range(paddr, paddr + size); 8772ffe2da3SRussell King 878a9c9147eSRussell King dma_cache_maint_page(page, off, size, dir, dmac_unmap_area); 879c0177800SCatalin Marinas 880c0177800SCatalin Marinas /* 881c0177800SCatalin Marinas * Mark the D-cache clean for this page to avoid extra flushing. 882c0177800SCatalin Marinas */ 883c0177800SCatalin Marinas if (dir != DMA_TO_DEVICE && off == 0 && size >= PAGE_SIZE) 884c0177800SCatalin Marinas set_bit(PG_dcache_clean, &page->flags); 8854ea0d737SRussell King } 88643377453SNicolas Pitre 887afd1a321SRussell King /** 8882a550e73SMarek Szyprowski * arm_dma_map_sg - map a set of SG buffers for streaming mode DMA 889afd1a321SRussell King * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices 890afd1a321SRussell King * @sg: list of buffers 891afd1a321SRussell King * @nents: number of buffers to map 892afd1a321SRussell King * @dir: DMA transfer direction 893afd1a321SRussell King * 894afd1a321SRussell King * Map a set of buffers described by scatterlist in streaming mode for DMA. 895afd1a321SRussell King * This is the scatter-gather version of the dma_map_single interface. 896afd1a321SRussell King * Here the scatter gather list elements are each tagged with the 897afd1a321SRussell King * appropriate dma address and length. They are obtained via 898afd1a321SRussell King * sg_dma_{address,length}. 899afd1a321SRussell King * 900afd1a321SRussell King * Device ownership issues as mentioned for dma_map_single are the same 901afd1a321SRussell King * here. 902afd1a321SRussell King */ 9032dc6a016SMarek Szyprowski int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, 9042dc6a016SMarek Szyprowski enum dma_data_direction dir, struct dma_attrs *attrs) 905afd1a321SRussell King { 9062a550e73SMarek Szyprowski struct dma_map_ops *ops = get_dma_ops(dev); 907afd1a321SRussell King struct scatterlist *s; 90801135d92SRussell King int i, j; 909afd1a321SRussell King 910afd1a321SRussell King for_each_sg(sg, s, nents, i) { 9114ce63fcdSMarek Szyprowski #ifdef CONFIG_NEED_SG_DMA_LENGTH 9124ce63fcdSMarek Szyprowski s->dma_length = s->length; 9134ce63fcdSMarek Szyprowski #endif 9142a550e73SMarek Szyprowski s->dma_address = ops->map_page(dev, sg_page(s), s->offset, 9152a550e73SMarek Szyprowski s->length, dir, attrs); 91601135d92SRussell King if (dma_mapping_error(dev, s->dma_address)) 91701135d92SRussell King goto bad_mapping; 918afd1a321SRussell King } 919afd1a321SRussell King return nents; 92001135d92SRussell King 92101135d92SRussell King bad_mapping: 92201135d92SRussell King for_each_sg(sg, s, i, j) 9232a550e73SMarek Szyprowski ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs); 92401135d92SRussell King return 0; 925afd1a321SRussell King } 926afd1a321SRussell King 927afd1a321SRussell King /** 9282a550e73SMarek Szyprowski * arm_dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg 929afd1a321SRussell King * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices 930afd1a321SRussell King * @sg: list of buffers 9310adfca6fSLinus Walleij * @nents: number of buffers to unmap (same as was passed to dma_map_sg) 932afd1a321SRussell King * @dir: DMA transfer direction (same as was passed to dma_map_sg) 933afd1a321SRussell King * 934afd1a321SRussell King * Unmap a set of streaming mode DMA translations. Again, CPU access 935afd1a321SRussell King * rules concerning calls here are the same as for dma_unmap_single(). 936afd1a321SRussell King */ 9372dc6a016SMarek Szyprowski void arm_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, 9382dc6a016SMarek Szyprowski enum dma_data_direction dir, struct dma_attrs *attrs) 939afd1a321SRussell King { 9402a550e73SMarek Szyprowski struct dma_map_ops *ops = get_dma_ops(dev); 94101135d92SRussell King struct scatterlist *s; 94201135d92SRussell King 94301135d92SRussell King int i; 94424056f52SRussell King 94501135d92SRussell King for_each_sg(sg, s, nents, i) 9462a550e73SMarek Szyprowski ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs); 947afd1a321SRussell King } 948afd1a321SRussell King 949afd1a321SRussell King /** 9502a550e73SMarek Szyprowski * arm_dma_sync_sg_for_cpu 951afd1a321SRussell King * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices 952afd1a321SRussell King * @sg: list of buffers 953afd1a321SRussell King * @nents: number of buffers to map (returned from dma_map_sg) 954afd1a321SRussell King * @dir: DMA transfer direction (same as was passed to dma_map_sg) 955afd1a321SRussell King */ 9562dc6a016SMarek Szyprowski void arm_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, 957afd1a321SRussell King int nents, enum dma_data_direction dir) 958afd1a321SRussell King { 9592a550e73SMarek Szyprowski struct dma_map_ops *ops = get_dma_ops(dev); 960afd1a321SRussell King struct scatterlist *s; 961afd1a321SRussell King int i; 962afd1a321SRussell King 9632a550e73SMarek Szyprowski for_each_sg(sg, s, nents, i) 9642a550e73SMarek Szyprowski ops->sync_single_for_cpu(dev, sg_dma_address(s), s->length, 9652a550e73SMarek Szyprowski dir); 966afd1a321SRussell King } 96724056f52SRussell King 968afd1a321SRussell King /** 9692a550e73SMarek Szyprowski * arm_dma_sync_sg_for_device 970afd1a321SRussell King * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices 971afd1a321SRussell King * @sg: list of buffers 972afd1a321SRussell King * @nents: number of buffers to map (returned from dma_map_sg) 973afd1a321SRussell King * @dir: DMA transfer direction (same as was passed to dma_map_sg) 974afd1a321SRussell King */ 9752dc6a016SMarek Szyprowski void arm_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, 976afd1a321SRussell King int nents, enum dma_data_direction dir) 977afd1a321SRussell King { 9782a550e73SMarek Szyprowski struct dma_map_ops *ops = get_dma_ops(dev); 979afd1a321SRussell King struct scatterlist *s; 980afd1a321SRussell King int i; 981afd1a321SRussell King 9822a550e73SMarek Szyprowski for_each_sg(sg, s, nents, i) 9832a550e73SMarek Szyprowski ops->sync_single_for_device(dev, sg_dma_address(s), s->length, 9842a550e73SMarek Szyprowski dir); 985afd1a321SRussell King } 98624056f52SRussell King 987022ae537SRussell King /* 988022ae537SRussell King * Return whether the given device DMA address mask can be supported 989022ae537SRussell King * properly. For example, if your device can only drive the low 24-bits 990022ae537SRussell King * during bus mastering, then you would pass 0x00ffffff as the mask 991022ae537SRussell King * to this function. 992022ae537SRussell King */ 993022ae537SRussell King int dma_supported(struct device *dev, u64 mask) 994022ae537SRussell King { 995022ae537SRussell King if (mask < (u64)arm_dma_limit) 996022ae537SRussell King return 0; 997022ae537SRussell King return 1; 998022ae537SRussell King } 999022ae537SRussell King EXPORT_SYMBOL(dma_supported); 1000022ae537SRussell King 100187b54e78SGregory CLEMENT int arm_dma_set_mask(struct device *dev, u64 dma_mask) 1002022ae537SRussell King { 1003022ae537SRussell King if (!dev->dma_mask || !dma_supported(dev, dma_mask)) 1004022ae537SRussell King return -EIO; 1005022ae537SRussell King 1006022ae537SRussell King *dev->dma_mask = dma_mask; 1007022ae537SRussell King 1008022ae537SRussell King return 0; 1009022ae537SRussell King } 1010022ae537SRussell King 101124056f52SRussell King #define PREALLOC_DMA_DEBUG_ENTRIES 4096 101224056f52SRussell King 101324056f52SRussell King static int __init dma_debug_do_init(void) 101424056f52SRussell King { 101524056f52SRussell King dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); 101624056f52SRussell King return 0; 101724056f52SRussell King } 101824056f52SRussell King fs_initcall(dma_debug_do_init); 10194ce63fcdSMarek Szyprowski 10204ce63fcdSMarek Szyprowski #ifdef CONFIG_ARM_DMA_USE_IOMMU 10214ce63fcdSMarek Szyprowski 10224ce63fcdSMarek Szyprowski /* IOMMU */ 10234ce63fcdSMarek Szyprowski 10244ce63fcdSMarek Szyprowski static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping, 10254ce63fcdSMarek Szyprowski size_t size) 10264ce63fcdSMarek Szyprowski { 10274ce63fcdSMarek Szyprowski unsigned int order = get_order(size); 10284ce63fcdSMarek Szyprowski unsigned int align = 0; 10294ce63fcdSMarek Szyprowski unsigned int count, start; 10304ce63fcdSMarek Szyprowski unsigned long flags; 10314ce63fcdSMarek Szyprowski 103260460abfSSeung-Woo Kim if (order > CONFIG_ARM_DMA_IOMMU_ALIGNMENT) 103360460abfSSeung-Woo Kim order = CONFIG_ARM_DMA_IOMMU_ALIGNMENT; 103460460abfSSeung-Woo Kim 10354ce63fcdSMarek Szyprowski count = ((PAGE_ALIGN(size) >> PAGE_SHIFT) + 10364ce63fcdSMarek Szyprowski (1 << mapping->order) - 1) >> mapping->order; 10374ce63fcdSMarek Szyprowski 10384ce63fcdSMarek Szyprowski if (order > mapping->order) 10394ce63fcdSMarek Szyprowski align = (1 << (order - mapping->order)) - 1; 10404ce63fcdSMarek Szyprowski 10414ce63fcdSMarek Szyprowski spin_lock_irqsave(&mapping->lock, flags); 10424ce63fcdSMarek Szyprowski start = bitmap_find_next_zero_area(mapping->bitmap, mapping->bits, 0, 10434ce63fcdSMarek Szyprowski count, align); 10444ce63fcdSMarek Szyprowski if (start > mapping->bits) { 10454ce63fcdSMarek Szyprowski spin_unlock_irqrestore(&mapping->lock, flags); 10464ce63fcdSMarek Szyprowski return DMA_ERROR_CODE; 10474ce63fcdSMarek Szyprowski } 10484ce63fcdSMarek Szyprowski 10494ce63fcdSMarek Szyprowski bitmap_set(mapping->bitmap, start, count); 10504ce63fcdSMarek Szyprowski spin_unlock_irqrestore(&mapping->lock, flags); 10514ce63fcdSMarek Szyprowski 10524ce63fcdSMarek Szyprowski return mapping->base + (start << (mapping->order + PAGE_SHIFT)); 10534ce63fcdSMarek Szyprowski } 10544ce63fcdSMarek Szyprowski 10554ce63fcdSMarek Szyprowski static inline void __free_iova(struct dma_iommu_mapping *mapping, 10564ce63fcdSMarek Szyprowski dma_addr_t addr, size_t size) 10574ce63fcdSMarek Szyprowski { 10584ce63fcdSMarek Szyprowski unsigned int start = (addr - mapping->base) >> 10594ce63fcdSMarek Szyprowski (mapping->order + PAGE_SHIFT); 10604ce63fcdSMarek Szyprowski unsigned int count = ((size >> PAGE_SHIFT) + 10614ce63fcdSMarek Szyprowski (1 << mapping->order) - 1) >> mapping->order; 10624ce63fcdSMarek Szyprowski unsigned long flags; 10634ce63fcdSMarek Szyprowski 10644ce63fcdSMarek Szyprowski spin_lock_irqsave(&mapping->lock, flags); 10654ce63fcdSMarek Szyprowski bitmap_clear(mapping->bitmap, start, count); 10664ce63fcdSMarek Szyprowski spin_unlock_irqrestore(&mapping->lock, flags); 10674ce63fcdSMarek Szyprowski } 10684ce63fcdSMarek Szyprowski 1069549a17e4SMarek Szyprowski static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, 1070549a17e4SMarek Szyprowski gfp_t gfp, struct dma_attrs *attrs) 10714ce63fcdSMarek Szyprowski { 10724ce63fcdSMarek Szyprowski struct page **pages; 10734ce63fcdSMarek Szyprowski int count = size >> PAGE_SHIFT; 10744ce63fcdSMarek Szyprowski int array_size = count * sizeof(struct page *); 10754ce63fcdSMarek Szyprowski int i = 0; 10764ce63fcdSMarek Szyprowski 10774ce63fcdSMarek Szyprowski if (array_size <= PAGE_SIZE) 10784ce63fcdSMarek Szyprowski pages = kzalloc(array_size, gfp); 10794ce63fcdSMarek Szyprowski else 10804ce63fcdSMarek Szyprowski pages = vzalloc(array_size); 10814ce63fcdSMarek Szyprowski if (!pages) 10824ce63fcdSMarek Szyprowski return NULL; 10834ce63fcdSMarek Szyprowski 1084549a17e4SMarek Szyprowski if (dma_get_attr(DMA_ATTR_FORCE_CONTIGUOUS, attrs)) 1085549a17e4SMarek Szyprowski { 1086549a17e4SMarek Szyprowski unsigned long order = get_order(size); 1087549a17e4SMarek Szyprowski struct page *page; 1088549a17e4SMarek Szyprowski 1089549a17e4SMarek Szyprowski page = dma_alloc_from_contiguous(dev, count, order); 1090549a17e4SMarek Szyprowski if (!page) 1091549a17e4SMarek Szyprowski goto error; 1092549a17e4SMarek Szyprowski 1093549a17e4SMarek Szyprowski __dma_clear_buffer(page, size); 1094549a17e4SMarek Szyprowski 1095549a17e4SMarek Szyprowski for (i = 0; i < count; i++) 1096549a17e4SMarek Szyprowski pages[i] = page + i; 1097549a17e4SMarek Szyprowski 1098549a17e4SMarek Szyprowski return pages; 1099549a17e4SMarek Szyprowski } 1100549a17e4SMarek Szyprowski 1101f8669befSMarek Szyprowski /* 1102f8669befSMarek Szyprowski * IOMMU can map any pages, so himem can also be used here 1103f8669befSMarek Szyprowski */ 1104f8669befSMarek Szyprowski gfp |= __GFP_NOWARN | __GFP_HIGHMEM; 1105f8669befSMarek Szyprowski 11064ce63fcdSMarek Szyprowski while (count) { 1107593f4735SMarek Szyprowski int j, order = __fls(count); 11084ce63fcdSMarek Szyprowski 1109f8669befSMarek Szyprowski pages[i] = alloc_pages(gfp, order); 11104ce63fcdSMarek Szyprowski while (!pages[i] && order) 1111f8669befSMarek Szyprowski pages[i] = alloc_pages(gfp, --order); 11124ce63fcdSMarek Szyprowski if (!pages[i]) 11134ce63fcdSMarek Szyprowski goto error; 11144ce63fcdSMarek Szyprowski 11155a796eebSHiroshi Doyu if (order) { 11164ce63fcdSMarek Szyprowski split_page(pages[i], order); 11174ce63fcdSMarek Szyprowski j = 1 << order; 11184ce63fcdSMarek Szyprowski while (--j) 11194ce63fcdSMarek Szyprowski pages[i + j] = pages[i] + j; 11205a796eebSHiroshi Doyu } 11214ce63fcdSMarek Szyprowski 11224ce63fcdSMarek Szyprowski __dma_clear_buffer(pages[i], PAGE_SIZE << order); 11234ce63fcdSMarek Szyprowski i += 1 << order; 11244ce63fcdSMarek Szyprowski count -= 1 << order; 11254ce63fcdSMarek Szyprowski } 11264ce63fcdSMarek Szyprowski 11274ce63fcdSMarek Szyprowski return pages; 11284ce63fcdSMarek Szyprowski error: 11299fa8af91SMarek Szyprowski while (i--) 11304ce63fcdSMarek Szyprowski if (pages[i]) 11314ce63fcdSMarek Szyprowski __free_pages(pages[i], 0); 113246c87852SPrathyush K if (array_size <= PAGE_SIZE) 11334ce63fcdSMarek Szyprowski kfree(pages); 11344ce63fcdSMarek Szyprowski else 11354ce63fcdSMarek Szyprowski vfree(pages); 11364ce63fcdSMarek Szyprowski return NULL; 11374ce63fcdSMarek Szyprowski } 11384ce63fcdSMarek Szyprowski 1139549a17e4SMarek Szyprowski static int __iommu_free_buffer(struct device *dev, struct page **pages, 1140549a17e4SMarek Szyprowski size_t size, struct dma_attrs *attrs) 11414ce63fcdSMarek Szyprowski { 11424ce63fcdSMarek Szyprowski int count = size >> PAGE_SHIFT; 11434ce63fcdSMarek Szyprowski int array_size = count * sizeof(struct page *); 11444ce63fcdSMarek Szyprowski int i; 1145549a17e4SMarek Szyprowski 1146549a17e4SMarek Szyprowski if (dma_get_attr(DMA_ATTR_FORCE_CONTIGUOUS, attrs)) { 1147549a17e4SMarek Szyprowski dma_release_from_contiguous(dev, pages[0], count); 1148549a17e4SMarek Szyprowski } else { 11494ce63fcdSMarek Szyprowski for (i = 0; i < count; i++) 11504ce63fcdSMarek Szyprowski if (pages[i]) 11514ce63fcdSMarek Szyprowski __free_pages(pages[i], 0); 1152549a17e4SMarek Szyprowski } 1153549a17e4SMarek Szyprowski 115446c87852SPrathyush K if (array_size <= PAGE_SIZE) 11554ce63fcdSMarek Szyprowski kfree(pages); 11564ce63fcdSMarek Szyprowski else 11574ce63fcdSMarek Szyprowski vfree(pages); 11584ce63fcdSMarek Szyprowski return 0; 11594ce63fcdSMarek Szyprowski } 11604ce63fcdSMarek Szyprowski 11614ce63fcdSMarek Szyprowski /* 11624ce63fcdSMarek Szyprowski * Create a CPU mapping for a specified pages 11634ce63fcdSMarek Szyprowski */ 11644ce63fcdSMarek Szyprowski static void * 1165e9da6e99SMarek Szyprowski __iommu_alloc_remap(struct page **pages, size_t size, gfp_t gfp, pgprot_t prot, 1166e9da6e99SMarek Szyprowski const void *caller) 11674ce63fcdSMarek Szyprowski { 1168e9da6e99SMarek Szyprowski unsigned int i, nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; 1169e9da6e99SMarek Szyprowski struct vm_struct *area; 1170e9da6e99SMarek Szyprowski unsigned long p; 11714ce63fcdSMarek Szyprowski 1172e9da6e99SMarek Szyprowski area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP, 1173e9da6e99SMarek Szyprowski caller); 1174e9da6e99SMarek Szyprowski if (!area) 11754ce63fcdSMarek Szyprowski return NULL; 1176e9da6e99SMarek Szyprowski 1177e9da6e99SMarek Szyprowski area->pages = pages; 1178e9da6e99SMarek Szyprowski area->nr_pages = nr_pages; 1179e9da6e99SMarek Szyprowski p = (unsigned long)area->addr; 1180e9da6e99SMarek Szyprowski 1181e9da6e99SMarek Szyprowski for (i = 0; i < nr_pages; i++) { 1182e9da6e99SMarek Szyprowski phys_addr_t phys = __pfn_to_phys(page_to_pfn(pages[i])); 1183e9da6e99SMarek Szyprowski if (ioremap_page_range(p, p + PAGE_SIZE, phys, prot)) 1184e9da6e99SMarek Szyprowski goto err; 1185e9da6e99SMarek Szyprowski p += PAGE_SIZE; 11864ce63fcdSMarek Szyprowski } 1187e9da6e99SMarek Szyprowski return area->addr; 1188e9da6e99SMarek Szyprowski err: 1189e9da6e99SMarek Szyprowski unmap_kernel_range((unsigned long)area->addr, size); 1190e9da6e99SMarek Szyprowski vunmap(area->addr); 11914ce63fcdSMarek Szyprowski return NULL; 11924ce63fcdSMarek Szyprowski } 11934ce63fcdSMarek Szyprowski 11944ce63fcdSMarek Szyprowski /* 11954ce63fcdSMarek Szyprowski * Create a mapping in device IO address space for specified pages 11964ce63fcdSMarek Szyprowski */ 11974ce63fcdSMarek Szyprowski static dma_addr_t 11984ce63fcdSMarek Szyprowski __iommu_create_mapping(struct device *dev, struct page **pages, size_t size) 11994ce63fcdSMarek Szyprowski { 12004ce63fcdSMarek Szyprowski struct dma_iommu_mapping *mapping = dev->archdata.mapping; 12014ce63fcdSMarek Szyprowski unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; 12024ce63fcdSMarek Szyprowski dma_addr_t dma_addr, iova; 12034ce63fcdSMarek Szyprowski int i, ret = DMA_ERROR_CODE; 12044ce63fcdSMarek Szyprowski 12054ce63fcdSMarek Szyprowski dma_addr = __alloc_iova(mapping, size); 12064ce63fcdSMarek Szyprowski if (dma_addr == DMA_ERROR_CODE) 12074ce63fcdSMarek Szyprowski return dma_addr; 12084ce63fcdSMarek Szyprowski 12094ce63fcdSMarek Szyprowski iova = dma_addr; 12104ce63fcdSMarek Szyprowski for (i = 0; i < count; ) { 12114ce63fcdSMarek Szyprowski unsigned int next_pfn = page_to_pfn(pages[i]) + 1; 12124ce63fcdSMarek Szyprowski phys_addr_t phys = page_to_phys(pages[i]); 12134ce63fcdSMarek Szyprowski unsigned int len, j; 12144ce63fcdSMarek Szyprowski 12154ce63fcdSMarek Szyprowski for (j = i + 1; j < count; j++, next_pfn++) 12164ce63fcdSMarek Szyprowski if (page_to_pfn(pages[j]) != next_pfn) 12174ce63fcdSMarek Szyprowski break; 12184ce63fcdSMarek Szyprowski 12194ce63fcdSMarek Szyprowski len = (j - i) << PAGE_SHIFT; 12204ce63fcdSMarek Szyprowski ret = iommu_map(mapping->domain, iova, phys, len, 0); 12214ce63fcdSMarek Szyprowski if (ret < 0) 12224ce63fcdSMarek Szyprowski goto fail; 12234ce63fcdSMarek Szyprowski iova += len; 12244ce63fcdSMarek Szyprowski i = j; 12254ce63fcdSMarek Szyprowski } 12264ce63fcdSMarek Szyprowski return dma_addr; 12274ce63fcdSMarek Szyprowski fail: 12284ce63fcdSMarek Szyprowski iommu_unmap(mapping->domain, dma_addr, iova-dma_addr); 12294ce63fcdSMarek Szyprowski __free_iova(mapping, dma_addr, size); 12304ce63fcdSMarek Szyprowski return DMA_ERROR_CODE; 12314ce63fcdSMarek Szyprowski } 12324ce63fcdSMarek Szyprowski 12334ce63fcdSMarek Szyprowski static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t size) 12344ce63fcdSMarek Szyprowski { 12354ce63fcdSMarek Szyprowski struct dma_iommu_mapping *mapping = dev->archdata.mapping; 12364ce63fcdSMarek Szyprowski 12374ce63fcdSMarek Szyprowski /* 12384ce63fcdSMarek Szyprowski * add optional in-page offset from iova to size and align 12394ce63fcdSMarek Szyprowski * result to page size 12404ce63fcdSMarek Szyprowski */ 12414ce63fcdSMarek Szyprowski size = PAGE_ALIGN((iova & ~PAGE_MASK) + size); 12424ce63fcdSMarek Szyprowski iova &= PAGE_MASK; 12434ce63fcdSMarek Szyprowski 12444ce63fcdSMarek Szyprowski iommu_unmap(mapping->domain, iova, size); 12454ce63fcdSMarek Szyprowski __free_iova(mapping, iova, size); 12464ce63fcdSMarek Szyprowski return 0; 12474ce63fcdSMarek Szyprowski } 12484ce63fcdSMarek Szyprowski 1249665bad7bSHiroshi Doyu static struct page **__atomic_get_pages(void *addr) 1250665bad7bSHiroshi Doyu { 1251665bad7bSHiroshi Doyu struct dma_pool *pool = &atomic_pool; 1252665bad7bSHiroshi Doyu struct page **pages = pool->pages; 1253665bad7bSHiroshi Doyu int offs = (addr - pool->vaddr) >> PAGE_SHIFT; 1254665bad7bSHiroshi Doyu 1255665bad7bSHiroshi Doyu return pages + offs; 1256665bad7bSHiroshi Doyu } 1257665bad7bSHiroshi Doyu 1258955c757eSMarek Szyprowski static struct page **__iommu_get_pages(void *cpu_addr, struct dma_attrs *attrs) 1259e9da6e99SMarek Szyprowski { 1260e9da6e99SMarek Szyprowski struct vm_struct *area; 1261e9da6e99SMarek Szyprowski 1262665bad7bSHiroshi Doyu if (__in_atomic_pool(cpu_addr, PAGE_SIZE)) 1263665bad7bSHiroshi Doyu return __atomic_get_pages(cpu_addr); 1264665bad7bSHiroshi Doyu 1265955c757eSMarek Szyprowski if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) 1266955c757eSMarek Szyprowski return cpu_addr; 1267955c757eSMarek Szyprowski 1268e9da6e99SMarek Szyprowski area = find_vm_area(cpu_addr); 1269e9da6e99SMarek Szyprowski if (area && (area->flags & VM_ARM_DMA_CONSISTENT)) 1270e9da6e99SMarek Szyprowski return area->pages; 1271e9da6e99SMarek Szyprowski return NULL; 1272e9da6e99SMarek Szyprowski } 1273e9da6e99SMarek Szyprowski 1274479ed93aSHiroshi Doyu static void *__iommu_alloc_atomic(struct device *dev, size_t size, 1275479ed93aSHiroshi Doyu dma_addr_t *handle) 1276479ed93aSHiroshi Doyu { 1277479ed93aSHiroshi Doyu struct page *page; 1278479ed93aSHiroshi Doyu void *addr; 1279479ed93aSHiroshi Doyu 1280479ed93aSHiroshi Doyu addr = __alloc_from_pool(size, &page); 1281479ed93aSHiroshi Doyu if (!addr) 1282479ed93aSHiroshi Doyu return NULL; 1283479ed93aSHiroshi Doyu 1284479ed93aSHiroshi Doyu *handle = __iommu_create_mapping(dev, &page, size); 1285479ed93aSHiroshi Doyu if (*handle == DMA_ERROR_CODE) 1286479ed93aSHiroshi Doyu goto err_mapping; 1287479ed93aSHiroshi Doyu 1288479ed93aSHiroshi Doyu return addr; 1289479ed93aSHiroshi Doyu 1290479ed93aSHiroshi Doyu err_mapping: 1291479ed93aSHiroshi Doyu __free_from_pool(addr, size); 1292479ed93aSHiroshi Doyu return NULL; 1293479ed93aSHiroshi Doyu } 1294479ed93aSHiroshi Doyu 1295479ed93aSHiroshi Doyu static void __iommu_free_atomic(struct device *dev, struct page **pages, 1296479ed93aSHiroshi Doyu dma_addr_t handle, size_t size) 1297479ed93aSHiroshi Doyu { 1298479ed93aSHiroshi Doyu __iommu_remove_mapping(dev, handle, size); 1299479ed93aSHiroshi Doyu __free_from_pool(page_address(pages[0]), size); 1300479ed93aSHiroshi Doyu } 1301479ed93aSHiroshi Doyu 13024ce63fcdSMarek Szyprowski static void *arm_iommu_alloc_attrs(struct device *dev, size_t size, 13034ce63fcdSMarek Szyprowski dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs) 13044ce63fcdSMarek Szyprowski { 13054ce63fcdSMarek Szyprowski pgprot_t prot = __get_dma_pgprot(attrs, pgprot_kernel); 13064ce63fcdSMarek Szyprowski struct page **pages; 13074ce63fcdSMarek Szyprowski void *addr = NULL; 13084ce63fcdSMarek Szyprowski 13094ce63fcdSMarek Szyprowski *handle = DMA_ERROR_CODE; 13104ce63fcdSMarek Szyprowski size = PAGE_ALIGN(size); 13114ce63fcdSMarek Szyprowski 1312479ed93aSHiroshi Doyu if (gfp & GFP_ATOMIC) 1313479ed93aSHiroshi Doyu return __iommu_alloc_atomic(dev, size, handle); 1314479ed93aSHiroshi Doyu 1315549a17e4SMarek Szyprowski pages = __iommu_alloc_buffer(dev, size, gfp, attrs); 13164ce63fcdSMarek Szyprowski if (!pages) 13174ce63fcdSMarek Szyprowski return NULL; 13184ce63fcdSMarek Szyprowski 13194ce63fcdSMarek Szyprowski *handle = __iommu_create_mapping(dev, pages, size); 13204ce63fcdSMarek Szyprowski if (*handle == DMA_ERROR_CODE) 13214ce63fcdSMarek Szyprowski goto err_buffer; 13224ce63fcdSMarek Szyprowski 1323955c757eSMarek Szyprowski if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) 1324955c757eSMarek Szyprowski return pages; 1325955c757eSMarek Szyprowski 1326e9da6e99SMarek Szyprowski addr = __iommu_alloc_remap(pages, size, gfp, prot, 1327e9da6e99SMarek Szyprowski __builtin_return_address(0)); 13284ce63fcdSMarek Szyprowski if (!addr) 13294ce63fcdSMarek Szyprowski goto err_mapping; 13304ce63fcdSMarek Szyprowski 13314ce63fcdSMarek Szyprowski return addr; 13324ce63fcdSMarek Szyprowski 13334ce63fcdSMarek Szyprowski err_mapping: 13344ce63fcdSMarek Szyprowski __iommu_remove_mapping(dev, *handle, size); 13354ce63fcdSMarek Szyprowski err_buffer: 1336549a17e4SMarek Szyprowski __iommu_free_buffer(dev, pages, size, attrs); 13374ce63fcdSMarek Szyprowski return NULL; 13384ce63fcdSMarek Szyprowski } 13394ce63fcdSMarek Szyprowski 13404ce63fcdSMarek Szyprowski static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma, 13414ce63fcdSMarek Szyprowski void *cpu_addr, dma_addr_t dma_addr, size_t size, 13424ce63fcdSMarek Szyprowski struct dma_attrs *attrs) 13434ce63fcdSMarek Szyprowski { 13444ce63fcdSMarek Szyprowski unsigned long uaddr = vma->vm_start; 13454ce63fcdSMarek Szyprowski unsigned long usize = vma->vm_end - vma->vm_start; 1346955c757eSMarek Szyprowski struct page **pages = __iommu_get_pages(cpu_addr, attrs); 1347e9da6e99SMarek Szyprowski 1348e9da6e99SMarek Szyprowski vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot); 1349e9da6e99SMarek Szyprowski 1350e9da6e99SMarek Szyprowski if (!pages) 1351e9da6e99SMarek Szyprowski return -ENXIO; 13524ce63fcdSMarek Szyprowski 13534ce63fcdSMarek Szyprowski do { 1354e9da6e99SMarek Szyprowski int ret = vm_insert_page(vma, uaddr, *pages++); 13554ce63fcdSMarek Szyprowski if (ret) { 1356e9da6e99SMarek Szyprowski pr_err("Remapping memory failed: %d\n", ret); 13574ce63fcdSMarek Szyprowski return ret; 13584ce63fcdSMarek Szyprowski } 13594ce63fcdSMarek Szyprowski uaddr += PAGE_SIZE; 13604ce63fcdSMarek Szyprowski usize -= PAGE_SIZE; 13614ce63fcdSMarek Szyprowski } while (usize > 0); 1362e9da6e99SMarek Szyprowski 13634ce63fcdSMarek Szyprowski return 0; 13644ce63fcdSMarek Szyprowski } 13654ce63fcdSMarek Szyprowski 13664ce63fcdSMarek Szyprowski /* 13674ce63fcdSMarek Szyprowski * free a page as defined by the above mapping. 13684ce63fcdSMarek Szyprowski * Must not be called with IRQs disabled. 13694ce63fcdSMarek Szyprowski */ 13704ce63fcdSMarek Szyprowski void arm_iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr, 13714ce63fcdSMarek Szyprowski dma_addr_t handle, struct dma_attrs *attrs) 13724ce63fcdSMarek Szyprowski { 1373955c757eSMarek Szyprowski struct page **pages = __iommu_get_pages(cpu_addr, attrs); 13744ce63fcdSMarek Szyprowski size = PAGE_ALIGN(size); 13754ce63fcdSMarek Szyprowski 1376e9da6e99SMarek Szyprowski if (!pages) { 1377e9da6e99SMarek Szyprowski WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr); 1378e9da6e99SMarek Szyprowski return; 1379e9da6e99SMarek Szyprowski } 1380e9da6e99SMarek Szyprowski 1381479ed93aSHiroshi Doyu if (__in_atomic_pool(cpu_addr, size)) { 1382479ed93aSHiroshi Doyu __iommu_free_atomic(dev, pages, handle, size); 1383479ed93aSHiroshi Doyu return; 1384479ed93aSHiroshi Doyu } 1385479ed93aSHiroshi Doyu 1386955c757eSMarek Szyprowski if (!dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) { 1387e9da6e99SMarek Szyprowski unmap_kernel_range((unsigned long)cpu_addr, size); 1388e9da6e99SMarek Szyprowski vunmap(cpu_addr); 1389955c757eSMarek Szyprowski } 1390e9da6e99SMarek Szyprowski 13914ce63fcdSMarek Szyprowski __iommu_remove_mapping(dev, handle, size); 1392549a17e4SMarek Szyprowski __iommu_free_buffer(dev, pages, size, attrs); 13934ce63fcdSMarek Szyprowski } 13944ce63fcdSMarek Szyprowski 1395dc2832e1SMarek Szyprowski static int arm_iommu_get_sgtable(struct device *dev, struct sg_table *sgt, 1396dc2832e1SMarek Szyprowski void *cpu_addr, dma_addr_t dma_addr, 1397dc2832e1SMarek Szyprowski size_t size, struct dma_attrs *attrs) 1398dc2832e1SMarek Szyprowski { 1399dc2832e1SMarek Szyprowski unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; 1400dc2832e1SMarek Szyprowski struct page **pages = __iommu_get_pages(cpu_addr, attrs); 1401dc2832e1SMarek Szyprowski 1402dc2832e1SMarek Szyprowski if (!pages) 1403dc2832e1SMarek Szyprowski return -ENXIO; 1404dc2832e1SMarek Szyprowski 1405dc2832e1SMarek Szyprowski return sg_alloc_table_from_pages(sgt, pages, count, 0, size, 1406dc2832e1SMarek Szyprowski GFP_KERNEL); 14074ce63fcdSMarek Szyprowski } 14084ce63fcdSMarek Szyprowski 14094ce63fcdSMarek Szyprowski /* 14104ce63fcdSMarek Szyprowski * Map a part of the scatter-gather list into contiguous io address space 14114ce63fcdSMarek Szyprowski */ 14124ce63fcdSMarek Szyprowski static int __map_sg_chunk(struct device *dev, struct scatterlist *sg, 14134ce63fcdSMarek Szyprowski size_t size, dma_addr_t *handle, 14140fa478dfSRob Herring enum dma_data_direction dir, struct dma_attrs *attrs, 14150fa478dfSRob Herring bool is_coherent) 14164ce63fcdSMarek Szyprowski { 14174ce63fcdSMarek Szyprowski struct dma_iommu_mapping *mapping = dev->archdata.mapping; 14184ce63fcdSMarek Szyprowski dma_addr_t iova, iova_base; 14194ce63fcdSMarek Szyprowski int ret = 0; 14204ce63fcdSMarek Szyprowski unsigned int count; 14214ce63fcdSMarek Szyprowski struct scatterlist *s; 14224ce63fcdSMarek Szyprowski 14234ce63fcdSMarek Szyprowski size = PAGE_ALIGN(size); 14244ce63fcdSMarek Szyprowski *handle = DMA_ERROR_CODE; 14254ce63fcdSMarek Szyprowski 14264ce63fcdSMarek Szyprowski iova_base = iova = __alloc_iova(mapping, size); 14274ce63fcdSMarek Szyprowski if (iova == DMA_ERROR_CODE) 14284ce63fcdSMarek Szyprowski return -ENOMEM; 14294ce63fcdSMarek Szyprowski 14304ce63fcdSMarek Szyprowski for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) { 14314ce63fcdSMarek Szyprowski phys_addr_t phys = page_to_phys(sg_page(s)); 14324ce63fcdSMarek Szyprowski unsigned int len = PAGE_ALIGN(s->offset + s->length); 14334ce63fcdSMarek Szyprowski 14340fa478dfSRob Herring if (!is_coherent && 143597ef952aSMarek Szyprowski !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) 14364ce63fcdSMarek Szyprowski __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir); 14374ce63fcdSMarek Szyprowski 14384ce63fcdSMarek Szyprowski ret = iommu_map(mapping->domain, iova, phys, len, 0); 14394ce63fcdSMarek Szyprowski if (ret < 0) 14404ce63fcdSMarek Szyprowski goto fail; 14414ce63fcdSMarek Szyprowski count += len >> PAGE_SHIFT; 14424ce63fcdSMarek Szyprowski iova += len; 14434ce63fcdSMarek Szyprowski } 14444ce63fcdSMarek Szyprowski *handle = iova_base; 14454ce63fcdSMarek Szyprowski 14464ce63fcdSMarek Szyprowski return 0; 14474ce63fcdSMarek Szyprowski fail: 14484ce63fcdSMarek Szyprowski iommu_unmap(mapping->domain, iova_base, count * PAGE_SIZE); 14494ce63fcdSMarek Szyprowski __free_iova(mapping, iova_base, size); 14504ce63fcdSMarek Szyprowski return ret; 14514ce63fcdSMarek Szyprowski } 14524ce63fcdSMarek Szyprowski 14530fa478dfSRob Herring static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents, 14540fa478dfSRob Herring enum dma_data_direction dir, struct dma_attrs *attrs, 14550fa478dfSRob Herring bool is_coherent) 14564ce63fcdSMarek Szyprowski { 14574ce63fcdSMarek Szyprowski struct scatterlist *s = sg, *dma = sg, *start = sg; 14584ce63fcdSMarek Szyprowski int i, count = 0; 14594ce63fcdSMarek Szyprowski unsigned int offset = s->offset; 14604ce63fcdSMarek Szyprowski unsigned int size = s->offset + s->length; 14614ce63fcdSMarek Szyprowski unsigned int max = dma_get_max_seg_size(dev); 14624ce63fcdSMarek Szyprowski 14634ce63fcdSMarek Szyprowski for (i = 1; i < nents; i++) { 14644ce63fcdSMarek Szyprowski s = sg_next(s); 14654ce63fcdSMarek Szyprowski 14664ce63fcdSMarek Szyprowski s->dma_address = DMA_ERROR_CODE; 14674ce63fcdSMarek Szyprowski s->dma_length = 0; 14684ce63fcdSMarek Szyprowski 14694ce63fcdSMarek Szyprowski if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) { 14704ce63fcdSMarek Szyprowski if (__map_sg_chunk(dev, start, size, &dma->dma_address, 14710fa478dfSRob Herring dir, attrs, is_coherent) < 0) 14724ce63fcdSMarek Szyprowski goto bad_mapping; 14734ce63fcdSMarek Szyprowski 14744ce63fcdSMarek Szyprowski dma->dma_address += offset; 14754ce63fcdSMarek Szyprowski dma->dma_length = size - offset; 14764ce63fcdSMarek Szyprowski 14774ce63fcdSMarek Szyprowski size = offset = s->offset; 14784ce63fcdSMarek Szyprowski start = s; 14794ce63fcdSMarek Szyprowski dma = sg_next(dma); 14804ce63fcdSMarek Szyprowski count += 1; 14814ce63fcdSMarek Szyprowski } 14824ce63fcdSMarek Szyprowski size += s->length; 14834ce63fcdSMarek Szyprowski } 14840fa478dfSRob Herring if (__map_sg_chunk(dev, start, size, &dma->dma_address, dir, attrs, 14850fa478dfSRob Herring is_coherent) < 0) 14864ce63fcdSMarek Szyprowski goto bad_mapping; 14874ce63fcdSMarek Szyprowski 14884ce63fcdSMarek Szyprowski dma->dma_address += offset; 14894ce63fcdSMarek Szyprowski dma->dma_length = size - offset; 14904ce63fcdSMarek Szyprowski 14914ce63fcdSMarek Szyprowski return count+1; 14924ce63fcdSMarek Szyprowski 14934ce63fcdSMarek Szyprowski bad_mapping: 14944ce63fcdSMarek Szyprowski for_each_sg(sg, s, count, i) 14954ce63fcdSMarek Szyprowski __iommu_remove_mapping(dev, sg_dma_address(s), sg_dma_len(s)); 14964ce63fcdSMarek Szyprowski return 0; 14974ce63fcdSMarek Szyprowski } 14984ce63fcdSMarek Szyprowski 14994ce63fcdSMarek Szyprowski /** 15000fa478dfSRob Herring * arm_coherent_iommu_map_sg - map a set of SG buffers for streaming mode DMA 15010fa478dfSRob Herring * @dev: valid struct device pointer 15020fa478dfSRob Herring * @sg: list of buffers 15030fa478dfSRob Herring * @nents: number of buffers to map 15040fa478dfSRob Herring * @dir: DMA transfer direction 15050fa478dfSRob Herring * 15060fa478dfSRob Herring * Map a set of i/o coherent buffers described by scatterlist in streaming 15070fa478dfSRob Herring * mode for DMA. The scatter gather list elements are merged together (if 15080fa478dfSRob Herring * possible) and tagged with the appropriate dma address and length. They are 15090fa478dfSRob Herring * obtained via sg_dma_{address,length}. 15100fa478dfSRob Herring */ 15110fa478dfSRob Herring int arm_coherent_iommu_map_sg(struct device *dev, struct scatterlist *sg, 15120fa478dfSRob Herring int nents, enum dma_data_direction dir, struct dma_attrs *attrs) 15130fa478dfSRob Herring { 15140fa478dfSRob Herring return __iommu_map_sg(dev, sg, nents, dir, attrs, true); 15150fa478dfSRob Herring } 15160fa478dfSRob Herring 15170fa478dfSRob Herring /** 15180fa478dfSRob Herring * arm_iommu_map_sg - map a set of SG buffers for streaming mode DMA 15190fa478dfSRob Herring * @dev: valid struct device pointer 15200fa478dfSRob Herring * @sg: list of buffers 15210fa478dfSRob Herring * @nents: number of buffers to map 15220fa478dfSRob Herring * @dir: DMA transfer direction 15230fa478dfSRob Herring * 15240fa478dfSRob Herring * Map a set of buffers described by scatterlist in streaming mode for DMA. 15250fa478dfSRob Herring * The scatter gather list elements are merged together (if possible) and 15260fa478dfSRob Herring * tagged with the appropriate dma address and length. They are obtained via 15270fa478dfSRob Herring * sg_dma_{address,length}. 15280fa478dfSRob Herring */ 15290fa478dfSRob Herring int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg, 15300fa478dfSRob Herring int nents, enum dma_data_direction dir, struct dma_attrs *attrs) 15310fa478dfSRob Herring { 15320fa478dfSRob Herring return __iommu_map_sg(dev, sg, nents, dir, attrs, false); 15330fa478dfSRob Herring } 15340fa478dfSRob Herring 15350fa478dfSRob Herring static void __iommu_unmap_sg(struct device *dev, struct scatterlist *sg, 15360fa478dfSRob Herring int nents, enum dma_data_direction dir, struct dma_attrs *attrs, 15370fa478dfSRob Herring bool is_coherent) 15380fa478dfSRob Herring { 15390fa478dfSRob Herring struct scatterlist *s; 15400fa478dfSRob Herring int i; 15410fa478dfSRob Herring 15420fa478dfSRob Herring for_each_sg(sg, s, nents, i) { 15430fa478dfSRob Herring if (sg_dma_len(s)) 15440fa478dfSRob Herring __iommu_remove_mapping(dev, sg_dma_address(s), 15450fa478dfSRob Herring sg_dma_len(s)); 15460fa478dfSRob Herring if (!is_coherent && 15470fa478dfSRob Herring !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) 15480fa478dfSRob Herring __dma_page_dev_to_cpu(sg_page(s), s->offset, 15490fa478dfSRob Herring s->length, dir); 15500fa478dfSRob Herring } 15510fa478dfSRob Herring } 15520fa478dfSRob Herring 15530fa478dfSRob Herring /** 15540fa478dfSRob Herring * arm_coherent_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg 15550fa478dfSRob Herring * @dev: valid struct device pointer 15560fa478dfSRob Herring * @sg: list of buffers 15570fa478dfSRob Herring * @nents: number of buffers to unmap (same as was passed to dma_map_sg) 15580fa478dfSRob Herring * @dir: DMA transfer direction (same as was passed to dma_map_sg) 15590fa478dfSRob Herring * 15600fa478dfSRob Herring * Unmap a set of streaming mode DMA translations. Again, CPU access 15610fa478dfSRob Herring * rules concerning calls here are the same as for dma_unmap_single(). 15620fa478dfSRob Herring */ 15630fa478dfSRob Herring void arm_coherent_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, 15640fa478dfSRob Herring int nents, enum dma_data_direction dir, struct dma_attrs *attrs) 15650fa478dfSRob Herring { 15660fa478dfSRob Herring __iommu_unmap_sg(dev, sg, nents, dir, attrs, true); 15670fa478dfSRob Herring } 15680fa478dfSRob Herring 15690fa478dfSRob Herring /** 15704ce63fcdSMarek Szyprowski * arm_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg 15714ce63fcdSMarek Szyprowski * @dev: valid struct device pointer 15724ce63fcdSMarek Szyprowski * @sg: list of buffers 15734ce63fcdSMarek Szyprowski * @nents: number of buffers to unmap (same as was passed to dma_map_sg) 15744ce63fcdSMarek Szyprowski * @dir: DMA transfer direction (same as was passed to dma_map_sg) 15754ce63fcdSMarek Szyprowski * 15764ce63fcdSMarek Szyprowski * Unmap a set of streaming mode DMA translations. Again, CPU access 15774ce63fcdSMarek Szyprowski * rules concerning calls here are the same as for dma_unmap_single(). 15784ce63fcdSMarek Szyprowski */ 15794ce63fcdSMarek Szyprowski void arm_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, 15804ce63fcdSMarek Szyprowski enum dma_data_direction dir, struct dma_attrs *attrs) 15814ce63fcdSMarek Szyprowski { 15820fa478dfSRob Herring __iommu_unmap_sg(dev, sg, nents, dir, attrs, false); 15834ce63fcdSMarek Szyprowski } 15844ce63fcdSMarek Szyprowski 15854ce63fcdSMarek Szyprowski /** 15864ce63fcdSMarek Szyprowski * arm_iommu_sync_sg_for_cpu 15874ce63fcdSMarek Szyprowski * @dev: valid struct device pointer 15884ce63fcdSMarek Szyprowski * @sg: list of buffers 15894ce63fcdSMarek Szyprowski * @nents: number of buffers to map (returned from dma_map_sg) 15904ce63fcdSMarek Szyprowski * @dir: DMA transfer direction (same as was passed to dma_map_sg) 15914ce63fcdSMarek Szyprowski */ 15924ce63fcdSMarek Szyprowski void arm_iommu_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, 15934ce63fcdSMarek Szyprowski int nents, enum dma_data_direction dir) 15944ce63fcdSMarek Szyprowski { 15954ce63fcdSMarek Szyprowski struct scatterlist *s; 15964ce63fcdSMarek Szyprowski int i; 15974ce63fcdSMarek Szyprowski 15984ce63fcdSMarek Szyprowski for_each_sg(sg, s, nents, i) 15994ce63fcdSMarek Szyprowski __dma_page_dev_to_cpu(sg_page(s), s->offset, s->length, dir); 16004ce63fcdSMarek Szyprowski 16014ce63fcdSMarek Szyprowski } 16024ce63fcdSMarek Szyprowski 16034ce63fcdSMarek Szyprowski /** 16044ce63fcdSMarek Szyprowski * arm_iommu_sync_sg_for_device 16054ce63fcdSMarek Szyprowski * @dev: valid struct device pointer 16064ce63fcdSMarek Szyprowski * @sg: list of buffers 16074ce63fcdSMarek Szyprowski * @nents: number of buffers to map (returned from dma_map_sg) 16084ce63fcdSMarek Szyprowski * @dir: DMA transfer direction (same as was passed to dma_map_sg) 16094ce63fcdSMarek Szyprowski */ 16104ce63fcdSMarek Szyprowski void arm_iommu_sync_sg_for_device(struct device *dev, struct scatterlist *sg, 16114ce63fcdSMarek Szyprowski int nents, enum dma_data_direction dir) 16124ce63fcdSMarek Szyprowski { 16134ce63fcdSMarek Szyprowski struct scatterlist *s; 16144ce63fcdSMarek Szyprowski int i; 16154ce63fcdSMarek Szyprowski 16164ce63fcdSMarek Szyprowski for_each_sg(sg, s, nents, i) 16174ce63fcdSMarek Szyprowski __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir); 16184ce63fcdSMarek Szyprowski } 16194ce63fcdSMarek Szyprowski 16204ce63fcdSMarek Szyprowski 16214ce63fcdSMarek Szyprowski /** 16220fa478dfSRob Herring * arm_coherent_iommu_map_page 16230fa478dfSRob Herring * @dev: valid struct device pointer 16240fa478dfSRob Herring * @page: page that buffer resides in 16250fa478dfSRob Herring * @offset: offset into page for start of buffer 16260fa478dfSRob Herring * @size: size of buffer to map 16270fa478dfSRob Herring * @dir: DMA transfer direction 16280fa478dfSRob Herring * 16290fa478dfSRob Herring * Coherent IOMMU aware version of arm_dma_map_page() 16300fa478dfSRob Herring */ 16310fa478dfSRob Herring static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *page, 16320fa478dfSRob Herring unsigned long offset, size_t size, enum dma_data_direction dir, 16330fa478dfSRob Herring struct dma_attrs *attrs) 16340fa478dfSRob Herring { 16350fa478dfSRob Herring struct dma_iommu_mapping *mapping = dev->archdata.mapping; 16360fa478dfSRob Herring dma_addr_t dma_addr; 16370fa478dfSRob Herring int ret, len = PAGE_ALIGN(size + offset); 16380fa478dfSRob Herring 16390fa478dfSRob Herring dma_addr = __alloc_iova(mapping, len); 16400fa478dfSRob Herring if (dma_addr == DMA_ERROR_CODE) 16410fa478dfSRob Herring return dma_addr; 16420fa478dfSRob Herring 16430fa478dfSRob Herring ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len, 0); 16440fa478dfSRob Herring if (ret < 0) 16450fa478dfSRob Herring goto fail; 16460fa478dfSRob Herring 16470fa478dfSRob Herring return dma_addr + offset; 16480fa478dfSRob Herring fail: 16490fa478dfSRob Herring __free_iova(mapping, dma_addr, len); 16500fa478dfSRob Herring return DMA_ERROR_CODE; 16510fa478dfSRob Herring } 16520fa478dfSRob Herring 16530fa478dfSRob Herring /** 16544ce63fcdSMarek Szyprowski * arm_iommu_map_page 16554ce63fcdSMarek Szyprowski * @dev: valid struct device pointer 16564ce63fcdSMarek Szyprowski * @page: page that buffer resides in 16574ce63fcdSMarek Szyprowski * @offset: offset into page for start of buffer 16584ce63fcdSMarek Szyprowski * @size: size of buffer to map 16594ce63fcdSMarek Szyprowski * @dir: DMA transfer direction 16604ce63fcdSMarek Szyprowski * 16614ce63fcdSMarek Szyprowski * IOMMU aware version of arm_dma_map_page() 16624ce63fcdSMarek Szyprowski */ 16634ce63fcdSMarek Szyprowski static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page, 16644ce63fcdSMarek Szyprowski unsigned long offset, size_t size, enum dma_data_direction dir, 16654ce63fcdSMarek Szyprowski struct dma_attrs *attrs) 16664ce63fcdSMarek Szyprowski { 16670fa478dfSRob Herring if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) 16684ce63fcdSMarek Szyprowski __dma_page_cpu_to_dev(page, offset, size, dir); 16694ce63fcdSMarek Szyprowski 16700fa478dfSRob Herring return arm_coherent_iommu_map_page(dev, page, offset, size, dir, attrs); 16710fa478dfSRob Herring } 16724ce63fcdSMarek Szyprowski 16730fa478dfSRob Herring /** 16740fa478dfSRob Herring * arm_coherent_iommu_unmap_page 16750fa478dfSRob Herring * @dev: valid struct device pointer 16760fa478dfSRob Herring * @handle: DMA address of buffer 16770fa478dfSRob Herring * @size: size of buffer (same as passed to dma_map_page) 16780fa478dfSRob Herring * @dir: DMA transfer direction (same as passed to dma_map_page) 16790fa478dfSRob Herring * 16800fa478dfSRob Herring * Coherent IOMMU aware version of arm_dma_unmap_page() 16810fa478dfSRob Herring */ 16820fa478dfSRob Herring static void arm_coherent_iommu_unmap_page(struct device *dev, dma_addr_t handle, 16830fa478dfSRob Herring size_t size, enum dma_data_direction dir, 16840fa478dfSRob Herring struct dma_attrs *attrs) 16850fa478dfSRob Herring { 16860fa478dfSRob Herring struct dma_iommu_mapping *mapping = dev->archdata.mapping; 16870fa478dfSRob Herring dma_addr_t iova = handle & PAGE_MASK; 16880fa478dfSRob Herring int offset = handle & ~PAGE_MASK; 16890fa478dfSRob Herring int len = PAGE_ALIGN(size + offset); 16904ce63fcdSMarek Szyprowski 16910fa478dfSRob Herring if (!iova) 16920fa478dfSRob Herring return; 16930fa478dfSRob Herring 16940fa478dfSRob Herring iommu_unmap(mapping->domain, iova, len); 16950fa478dfSRob Herring __free_iova(mapping, iova, len); 16964ce63fcdSMarek Szyprowski } 16974ce63fcdSMarek Szyprowski 16984ce63fcdSMarek Szyprowski /** 16994ce63fcdSMarek Szyprowski * arm_iommu_unmap_page 17004ce63fcdSMarek Szyprowski * @dev: valid struct device pointer 17014ce63fcdSMarek Szyprowski * @handle: DMA address of buffer 17024ce63fcdSMarek Szyprowski * @size: size of buffer (same as passed to dma_map_page) 17034ce63fcdSMarek Szyprowski * @dir: DMA transfer direction (same as passed to dma_map_page) 17044ce63fcdSMarek Szyprowski * 17054ce63fcdSMarek Szyprowski * IOMMU aware version of arm_dma_unmap_page() 17064ce63fcdSMarek Szyprowski */ 17074ce63fcdSMarek Szyprowski static void arm_iommu_unmap_page(struct device *dev, dma_addr_t handle, 17084ce63fcdSMarek Szyprowski size_t size, enum dma_data_direction dir, 17094ce63fcdSMarek Szyprowski struct dma_attrs *attrs) 17104ce63fcdSMarek Szyprowski { 17114ce63fcdSMarek Szyprowski struct dma_iommu_mapping *mapping = dev->archdata.mapping; 17124ce63fcdSMarek Szyprowski dma_addr_t iova = handle & PAGE_MASK; 17134ce63fcdSMarek Szyprowski struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova)); 17144ce63fcdSMarek Szyprowski int offset = handle & ~PAGE_MASK; 17154ce63fcdSMarek Szyprowski int len = PAGE_ALIGN(size + offset); 17164ce63fcdSMarek Szyprowski 17174ce63fcdSMarek Szyprowski if (!iova) 17184ce63fcdSMarek Szyprowski return; 17194ce63fcdSMarek Szyprowski 17200fa478dfSRob Herring if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) 17214ce63fcdSMarek Szyprowski __dma_page_dev_to_cpu(page, offset, size, dir); 17224ce63fcdSMarek Szyprowski 17234ce63fcdSMarek Szyprowski iommu_unmap(mapping->domain, iova, len); 17244ce63fcdSMarek Szyprowski __free_iova(mapping, iova, len); 17254ce63fcdSMarek Szyprowski } 17264ce63fcdSMarek Szyprowski 17274ce63fcdSMarek Szyprowski static void arm_iommu_sync_single_for_cpu(struct device *dev, 17284ce63fcdSMarek Szyprowski dma_addr_t handle, size_t size, enum dma_data_direction dir) 17294ce63fcdSMarek Szyprowski { 17304ce63fcdSMarek Szyprowski struct dma_iommu_mapping *mapping = dev->archdata.mapping; 17314ce63fcdSMarek Szyprowski dma_addr_t iova = handle & PAGE_MASK; 17324ce63fcdSMarek Szyprowski struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova)); 17334ce63fcdSMarek Szyprowski unsigned int offset = handle & ~PAGE_MASK; 17344ce63fcdSMarek Szyprowski 17354ce63fcdSMarek Szyprowski if (!iova) 17364ce63fcdSMarek Szyprowski return; 17374ce63fcdSMarek Szyprowski 17384ce63fcdSMarek Szyprowski __dma_page_dev_to_cpu(page, offset, size, dir); 17394ce63fcdSMarek Szyprowski } 17404ce63fcdSMarek Szyprowski 17414ce63fcdSMarek Szyprowski static void arm_iommu_sync_single_for_device(struct device *dev, 17424ce63fcdSMarek Szyprowski dma_addr_t handle, size_t size, enum dma_data_direction dir) 17434ce63fcdSMarek Szyprowski { 17444ce63fcdSMarek Szyprowski struct dma_iommu_mapping *mapping = dev->archdata.mapping; 17454ce63fcdSMarek Szyprowski dma_addr_t iova = handle & PAGE_MASK; 17464ce63fcdSMarek Szyprowski struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova)); 17474ce63fcdSMarek Szyprowski unsigned int offset = handle & ~PAGE_MASK; 17484ce63fcdSMarek Szyprowski 17494ce63fcdSMarek Szyprowski if (!iova) 17504ce63fcdSMarek Szyprowski return; 17514ce63fcdSMarek Szyprowski 17524ce63fcdSMarek Szyprowski __dma_page_cpu_to_dev(page, offset, size, dir); 17534ce63fcdSMarek Szyprowski } 17544ce63fcdSMarek Szyprowski 17554ce63fcdSMarek Szyprowski struct dma_map_ops iommu_ops = { 17564ce63fcdSMarek Szyprowski .alloc = arm_iommu_alloc_attrs, 17574ce63fcdSMarek Szyprowski .free = arm_iommu_free_attrs, 17584ce63fcdSMarek Szyprowski .mmap = arm_iommu_mmap_attrs, 1759dc2832e1SMarek Szyprowski .get_sgtable = arm_iommu_get_sgtable, 17604ce63fcdSMarek Szyprowski 17614ce63fcdSMarek Szyprowski .map_page = arm_iommu_map_page, 17624ce63fcdSMarek Szyprowski .unmap_page = arm_iommu_unmap_page, 17634ce63fcdSMarek Szyprowski .sync_single_for_cpu = arm_iommu_sync_single_for_cpu, 17644ce63fcdSMarek Szyprowski .sync_single_for_device = arm_iommu_sync_single_for_device, 17654ce63fcdSMarek Szyprowski 17664ce63fcdSMarek Szyprowski .map_sg = arm_iommu_map_sg, 17674ce63fcdSMarek Szyprowski .unmap_sg = arm_iommu_unmap_sg, 17684ce63fcdSMarek Szyprowski .sync_sg_for_cpu = arm_iommu_sync_sg_for_cpu, 17694ce63fcdSMarek Szyprowski .sync_sg_for_device = arm_iommu_sync_sg_for_device, 1770d09e1333SHiroshi Doyu 1771d09e1333SHiroshi Doyu .set_dma_mask = arm_dma_set_mask, 17724ce63fcdSMarek Szyprowski }; 17734ce63fcdSMarek Szyprowski 17740fa478dfSRob Herring struct dma_map_ops iommu_coherent_ops = { 17750fa478dfSRob Herring .alloc = arm_iommu_alloc_attrs, 17760fa478dfSRob Herring .free = arm_iommu_free_attrs, 17770fa478dfSRob Herring .mmap = arm_iommu_mmap_attrs, 17780fa478dfSRob Herring .get_sgtable = arm_iommu_get_sgtable, 17790fa478dfSRob Herring 17800fa478dfSRob Herring .map_page = arm_coherent_iommu_map_page, 17810fa478dfSRob Herring .unmap_page = arm_coherent_iommu_unmap_page, 17820fa478dfSRob Herring 17830fa478dfSRob Herring .map_sg = arm_coherent_iommu_map_sg, 17840fa478dfSRob Herring .unmap_sg = arm_coherent_iommu_unmap_sg, 1785d09e1333SHiroshi Doyu 1786d09e1333SHiroshi Doyu .set_dma_mask = arm_dma_set_mask, 17870fa478dfSRob Herring }; 17880fa478dfSRob Herring 17894ce63fcdSMarek Szyprowski /** 17904ce63fcdSMarek Szyprowski * arm_iommu_create_mapping 17914ce63fcdSMarek Szyprowski * @bus: pointer to the bus holding the client device (for IOMMU calls) 17924ce63fcdSMarek Szyprowski * @base: start address of the valid IO address space 17934ce63fcdSMarek Szyprowski * @size: size of the valid IO address space 17944ce63fcdSMarek Szyprowski * @order: accuracy of the IO addresses allocations 17954ce63fcdSMarek Szyprowski * 17964ce63fcdSMarek Szyprowski * Creates a mapping structure which holds information about used/unused 17974ce63fcdSMarek Szyprowski * IO address ranges, which is required to perform memory allocation and 17984ce63fcdSMarek Szyprowski * mapping with IOMMU aware functions. 17994ce63fcdSMarek Szyprowski * 18004ce63fcdSMarek Szyprowski * The client device need to be attached to the mapping with 18014ce63fcdSMarek Szyprowski * arm_iommu_attach_device function. 18024ce63fcdSMarek Szyprowski */ 18034ce63fcdSMarek Szyprowski struct dma_iommu_mapping * 18044ce63fcdSMarek Szyprowski arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size, 18054ce63fcdSMarek Szyprowski int order) 18064ce63fcdSMarek Szyprowski { 18074ce63fcdSMarek Szyprowski unsigned int count = size >> (PAGE_SHIFT + order); 18084ce63fcdSMarek Szyprowski unsigned int bitmap_size = BITS_TO_LONGS(count) * sizeof(long); 18094ce63fcdSMarek Szyprowski struct dma_iommu_mapping *mapping; 18104ce63fcdSMarek Szyprowski int err = -ENOMEM; 18114ce63fcdSMarek Szyprowski 18124ce63fcdSMarek Szyprowski if (!count) 18134ce63fcdSMarek Szyprowski return ERR_PTR(-EINVAL); 18144ce63fcdSMarek Szyprowski 18154ce63fcdSMarek Szyprowski mapping = kzalloc(sizeof(struct dma_iommu_mapping), GFP_KERNEL); 18164ce63fcdSMarek Szyprowski if (!mapping) 18174ce63fcdSMarek Szyprowski goto err; 18184ce63fcdSMarek Szyprowski 18194ce63fcdSMarek Szyprowski mapping->bitmap = kzalloc(bitmap_size, GFP_KERNEL); 18204ce63fcdSMarek Szyprowski if (!mapping->bitmap) 18214ce63fcdSMarek Szyprowski goto err2; 18224ce63fcdSMarek Szyprowski 18234ce63fcdSMarek Szyprowski mapping->base = base; 18244ce63fcdSMarek Szyprowski mapping->bits = BITS_PER_BYTE * bitmap_size; 18254ce63fcdSMarek Szyprowski mapping->order = order; 18264ce63fcdSMarek Szyprowski spin_lock_init(&mapping->lock); 18274ce63fcdSMarek Szyprowski 18284ce63fcdSMarek Szyprowski mapping->domain = iommu_domain_alloc(bus); 18294ce63fcdSMarek Szyprowski if (!mapping->domain) 18304ce63fcdSMarek Szyprowski goto err3; 18314ce63fcdSMarek Szyprowski 18324ce63fcdSMarek Szyprowski kref_init(&mapping->kref); 18334ce63fcdSMarek Szyprowski return mapping; 18344ce63fcdSMarek Szyprowski err3: 18354ce63fcdSMarek Szyprowski kfree(mapping->bitmap); 18364ce63fcdSMarek Szyprowski err2: 18374ce63fcdSMarek Szyprowski kfree(mapping); 18384ce63fcdSMarek Szyprowski err: 18394ce63fcdSMarek Szyprowski return ERR_PTR(err); 18404ce63fcdSMarek Szyprowski } 184118177d12SPrathyush K EXPORT_SYMBOL_GPL(arm_iommu_create_mapping); 18424ce63fcdSMarek Szyprowski 18434ce63fcdSMarek Szyprowski static void release_iommu_mapping(struct kref *kref) 18444ce63fcdSMarek Szyprowski { 18454ce63fcdSMarek Szyprowski struct dma_iommu_mapping *mapping = 18464ce63fcdSMarek Szyprowski container_of(kref, struct dma_iommu_mapping, kref); 18474ce63fcdSMarek Szyprowski 18484ce63fcdSMarek Szyprowski iommu_domain_free(mapping->domain); 18494ce63fcdSMarek Szyprowski kfree(mapping->bitmap); 18504ce63fcdSMarek Szyprowski kfree(mapping); 18514ce63fcdSMarek Szyprowski } 18524ce63fcdSMarek Szyprowski 18534ce63fcdSMarek Szyprowski void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping) 18544ce63fcdSMarek Szyprowski { 18554ce63fcdSMarek Szyprowski if (mapping) 18564ce63fcdSMarek Szyprowski kref_put(&mapping->kref, release_iommu_mapping); 18574ce63fcdSMarek Szyprowski } 185818177d12SPrathyush K EXPORT_SYMBOL_GPL(arm_iommu_release_mapping); 18594ce63fcdSMarek Szyprowski 18604ce63fcdSMarek Szyprowski /** 18614ce63fcdSMarek Szyprowski * arm_iommu_attach_device 18624ce63fcdSMarek Szyprowski * @dev: valid struct device pointer 18634ce63fcdSMarek Szyprowski * @mapping: io address space mapping structure (returned from 18644ce63fcdSMarek Szyprowski * arm_iommu_create_mapping) 18654ce63fcdSMarek Szyprowski * 18664ce63fcdSMarek Szyprowski * Attaches specified io address space mapping to the provided device, 18674ce63fcdSMarek Szyprowski * this replaces the dma operations (dma_map_ops pointer) with the 18684ce63fcdSMarek Szyprowski * IOMMU aware version. More than one client might be attached to 18694ce63fcdSMarek Szyprowski * the same io address space mapping. 18704ce63fcdSMarek Szyprowski */ 18714ce63fcdSMarek Szyprowski int arm_iommu_attach_device(struct device *dev, 18724ce63fcdSMarek Szyprowski struct dma_iommu_mapping *mapping) 18734ce63fcdSMarek Szyprowski { 18744ce63fcdSMarek Szyprowski int err; 18754ce63fcdSMarek Szyprowski 18764ce63fcdSMarek Szyprowski err = iommu_attach_device(mapping->domain, dev); 18774ce63fcdSMarek Szyprowski if (err) 18784ce63fcdSMarek Szyprowski return err; 18794ce63fcdSMarek Szyprowski 18804ce63fcdSMarek Szyprowski kref_get(&mapping->kref); 18814ce63fcdSMarek Szyprowski dev->archdata.mapping = mapping; 18824ce63fcdSMarek Szyprowski set_dma_ops(dev, &iommu_ops); 18834ce63fcdSMarek Szyprowski 188475c59716SHiroshi Doyu pr_debug("Attached IOMMU controller to %s device.\n", dev_name(dev)); 18854ce63fcdSMarek Szyprowski return 0; 18864ce63fcdSMarek Szyprowski } 188718177d12SPrathyush K EXPORT_SYMBOL_GPL(arm_iommu_attach_device); 18884ce63fcdSMarek Szyprowski 18896fe36758SHiroshi Doyu /** 18906fe36758SHiroshi Doyu * arm_iommu_detach_device 18916fe36758SHiroshi Doyu * @dev: valid struct device pointer 18926fe36758SHiroshi Doyu * 18936fe36758SHiroshi Doyu * Detaches the provided device from a previously attached map. 18946fe36758SHiroshi Doyu * This voids the dma operations (dma_map_ops pointer) 18956fe36758SHiroshi Doyu */ 18966fe36758SHiroshi Doyu void arm_iommu_detach_device(struct device *dev) 18976fe36758SHiroshi Doyu { 18986fe36758SHiroshi Doyu struct dma_iommu_mapping *mapping; 18996fe36758SHiroshi Doyu 19006fe36758SHiroshi Doyu mapping = to_dma_iommu_mapping(dev); 19016fe36758SHiroshi Doyu if (!mapping) { 19026fe36758SHiroshi Doyu dev_warn(dev, "Not attached\n"); 19036fe36758SHiroshi Doyu return; 19046fe36758SHiroshi Doyu } 19056fe36758SHiroshi Doyu 19066fe36758SHiroshi Doyu iommu_detach_device(mapping->domain, dev); 19076fe36758SHiroshi Doyu kref_put(&mapping->kref, release_iommu_mapping); 19086fe36758SHiroshi Doyu mapping = NULL; 19096fe36758SHiroshi Doyu set_dma_ops(dev, NULL); 19106fe36758SHiroshi Doyu 19116fe36758SHiroshi Doyu pr_debug("Detached IOMMU controller from %s device.\n", dev_name(dev)); 19126fe36758SHiroshi Doyu } 191318177d12SPrathyush K EXPORT_SYMBOL_GPL(arm_iommu_detach_device); 19146fe36758SHiroshi Doyu 19154ce63fcdSMarek Szyprowski #endif 1916