X-Git-Url: http://ftp.safe.ca/?p=safe%2Fjmp%2Flinux-2.6;a=blobdiff_plain;f=lib%2Fswiotlb.c;h=437eedb5a53ba1feae04f98b5def86798462f920;hp=566791b3f583112bbcd1cd8410047b6349fe7017;hb=e071041be037eca208b62b84469a06bdfc692bea;hpb=878a97cfd7014b01285db09f52f9881ffe4cb608 diff --git a/lib/swiotlb.c b/lib/swiotlb.c index 566791b..437eedb 100644 --- a/lib/swiotlb.c +++ b/lib/swiotlb.c @@ -1,7 +1,7 @@ /* * Dynamic DMA mapping support. * - * This implementation is for IA-64 platforms that do not support + * This implementation is a fallback for platforms that do not support * I/O TLBs (aka DMA address translation hardware). * Copyright (C) 2000 Asit Mallick * Copyright (C) 2000 Goutham Rao @@ -11,44 +11,35 @@ * 03/05/07 davidm Switch from PCI-DMA to generic device DMA API. * 00/12/13 davidm Rename to swiotlb.c and add mark_clean() to avoid * unnecessary i-cache flushing. - * 04/07/.. ak Better overflow handling. Assorted fixes. + * 04/07/.. ak Better overflow handling. Assorted fixes. + * 05/09/10 linville Add support for syncing ranges, support syncing for + * DMA_BIDIRECTIONAL mappings, miscellaneous cleanup. + * 08/12/11 beckyb Add highmem support */ #include +#include #include #include -#include #include #include +#include +#include #include #include +#include #include -#include #include +#include #include #include +#include #define OFFSET(val,align) ((unsigned long) \ ( (val) & ( (align) - 1))) -#define SG_ENT_VIRT_ADDRESS(sg) (page_address((sg)->page) + (sg)->offset) -#define SG_ENT_PHYS_ADDRESS(SG) virt_to_phys(SG_ENT_VIRT_ADDRESS(SG)) - -/* - * Maximum allowable number of contiguous slabs to map, - * must be a power of 2. What is the appropriate value ? - * The complexity of {map,unmap}_single is linearly dependent on this value. - */ -#define IO_TLB_SEGSIZE 128 - -/* - * log of the size of each IO TLB slab. The number of slabs is command line - * controllable. - */ -#define IO_TLB_SHIFT 11 - #define SLABS_PER_PAGE (1 << (PAGE_SHIFT - IO_TLB_SHIFT)) /* @@ -58,11 +49,19 @@ */ #define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT) +/* + * Enumeration for sync targets + */ +enum dma_sync_target { + SYNC_FOR_CPU = 0, + SYNC_FOR_DEVICE = 1, +}; + int swiotlb_force; /* - * Used to do a quick range check in swiotlb_unmap_single and - * swiotlb_sync_single_*, to see if the memory was in fact allocated by this + * Used to do a quick range check in unmap_single and + * sync_single_*, to see if the memory was in fact allocated by this * API. */ static char *io_tlb_start, *io_tlb_end; @@ -91,13 +90,15 @@ static unsigned int io_tlb_index; * We need to save away the original address corresponding to a mapped entry * for the sync operations. */ -static unsigned char **io_tlb_orig_addr; +static phys_addr_t *io_tlb_orig_addr; /* * Protect the above data structures in the map and unmap calls */ static DEFINE_SPINLOCK(io_tlb_lock); +static int late_alloc; + static int __init setup_io_tlb_npages(char *str) { @@ -110,33 +111,57 @@ setup_io_tlb_npages(char *str) ++str; if (!strcmp(str, "force")) swiotlb_force = 1; + return 1; } __setup("swiotlb=", setup_io_tlb_npages); /* make io_tlb_overflow tunable too? */ +/* Note that this doesn't work with highmem page */ +static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev, + volatile void *address) +{ + return phys_to_dma(hwdev, virt_to_phys(address)); +} + +void swiotlb_print_info(void) +{ + unsigned long bytes = io_tlb_nslabs << IO_TLB_SHIFT; + phys_addr_t pstart, pend; + + pstart = virt_to_phys(io_tlb_start); + pend = virt_to_phys(io_tlb_end); + + printk(KERN_INFO "Placing %luMB software IO TLB between %p - %p\n", + bytes >> 20, io_tlb_start, io_tlb_end); + printk(KERN_INFO "software IO TLB at phys %#llx - %#llx\n", + (unsigned long long)pstart, + (unsigned long long)pend); +} + /* * Statically reserve bounce buffer space and initialize bounce buffer data - * structures for the software IO TLB used to implement the PCI DMA API. + * structures for the software IO TLB used to implement the DMA API. */ -void -swiotlb_init_with_default_size (size_t default_size) +void __init +swiotlb_init_with_default_size(size_t default_size, int verbose) { - unsigned long i; + unsigned long i, bytes; if (!io_tlb_nslabs) { io_tlb_nslabs = (default_size >> IO_TLB_SHIFT); io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); } + bytes = io_tlb_nslabs << IO_TLB_SHIFT; + /* * Get IO TLB memory from the low pages */ - io_tlb_start = alloc_bootmem_low_pages(io_tlb_nslabs * - (1 << IO_TLB_SHIFT)); + io_tlb_start = alloc_bootmem_low_pages(bytes); if (!io_tlb_start) panic("Cannot allocate SWIOTLB buffer"); - io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT); + io_tlb_end = io_tlb_start + bytes; /* * Allocate and initialize the free list array. This array is used @@ -147,20 +172,22 @@ swiotlb_init_with_default_size (size_t default_size) for (i = 0; i < io_tlb_nslabs; i++) io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); io_tlb_index = 0; - io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(char *)); + io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(phys_addr_t)); /* * Get the overflow emergency buffer */ io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow); - printk(KERN_INFO "Placing software IO TLB between 0x%lx - 0x%lx\n", - virt_to_phys(io_tlb_start), virt_to_phys(io_tlb_end)); + if (!io_tlb_overflow_buffer) + panic("Cannot allocate SWIOTLB overflow buffer!\n"); + if (verbose) + swiotlb_print_info(); } -void -swiotlb_init (void) +void __init +swiotlb_init(int verbose) { - swiotlb_init_with_default_size(64 * (1<<20)); /* default to 64MB */ + swiotlb_init_with_default_size(64 * (1<<20), verbose); /* default to 64MB */ } /* @@ -169,9 +196,9 @@ swiotlb_init (void) * This should be just like above, but with some error catching. */ int -swiotlb_late_init_with_default_size (size_t default_size) +swiotlb_late_init_with_default_size(size_t default_size) { - unsigned long i, req_nslabs = io_tlb_nslabs; + unsigned long i, bytes, req_nslabs = io_tlb_nslabs; unsigned int order; if (!io_tlb_nslabs) { @@ -182,12 +209,13 @@ swiotlb_late_init_with_default_size (size_t default_size) /* * Get IO TLB memory from the low pages */ - order = get_order(io_tlb_nslabs * (1 << IO_TLB_SHIFT)); + order = get_order(io_tlb_nslabs << IO_TLB_SHIFT); io_tlb_nslabs = SLABS_PER_PAGE << order; + bytes = io_tlb_nslabs << IO_TLB_SHIFT; while ((SLABS_PER_PAGE << order) > IO_TLB_MIN_SLABS) { - io_tlb_start = (char *)__get_free_pages(GFP_DMA | __GFP_NOWARN, - order); + io_tlb_start = (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, + order); if (io_tlb_start) break; order--; @@ -196,13 +224,14 @@ swiotlb_late_init_with_default_size (size_t default_size) if (!io_tlb_start) goto cleanup1; - if (order != get_order(io_tlb_nslabs * (1 << IO_TLB_SHIFT))) { + if (order != get_order(bytes)) { printk(KERN_WARNING "Warning: only able to allocate %ld MB " "for software IO TLB\n", (PAGE_SIZE << order) >> 20); io_tlb_nslabs = SLABS_PER_PAGE << order; + bytes = io_tlb_nslabs << IO_TLB_SHIFT; } - io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT); - memset(io_tlb_start, 0, io_tlb_nslabs * (1 << IO_TLB_SHIFT)); + io_tlb_end = io_tlb_start + bytes; + memset(io_tlb_start, 0, bytes); /* * Allocate and initialize the free list array. This array is used @@ -218,12 +247,14 @@ swiotlb_late_init_with_default_size (size_t default_size) io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); io_tlb_index = 0; - io_tlb_orig_addr = (unsigned char **)__get_free_pages(GFP_KERNEL, - get_order(io_tlb_nslabs * sizeof(char *))); + io_tlb_orig_addr = (phys_addr_t *) + __get_free_pages(GFP_KERNEL, + get_order(io_tlb_nslabs * + sizeof(phys_addr_t))); if (!io_tlb_orig_addr) goto cleanup3; - memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(char *)); + memset(io_tlb_orig_addr, 0, io_tlb_nslabs * sizeof(phys_addr_t)); /* * Get the overflow emergency buffer @@ -233,22 +264,22 @@ swiotlb_late_init_with_default_size (size_t default_size) if (!io_tlb_overflow_buffer) goto cleanup4; - printk(KERN_INFO "Placing %ldMB software IO TLB between 0x%lx - " - "0x%lx\n", (io_tlb_nslabs * (1 << IO_TLB_SHIFT)) >> 20, - virt_to_phys(io_tlb_start), virt_to_phys(io_tlb_end)); + swiotlb_print_info(); + + late_alloc = 1; return 0; cleanup4: - free_pages((unsigned long)io_tlb_orig_addr, get_order(io_tlb_nslabs * - sizeof(char *))); + free_pages((unsigned long)io_tlb_orig_addr, + get_order(io_tlb_nslabs * sizeof(phys_addr_t))); io_tlb_orig_addr = NULL; cleanup3: free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs * sizeof(int))); io_tlb_list = NULL; - io_tlb_end = NULL; cleanup2: + io_tlb_end = NULL; free_pages((unsigned long)io_tlb_start, order); io_tlb_start = NULL; cleanup1: @@ -256,26 +287,105 @@ cleanup1: return -ENOMEM; } -static inline int -address_needs_mapping(struct device *hwdev, dma_addr_t addr) +void __init swiotlb_free(void) { - dma_addr_t mask = 0xffffffff; - /* If the device has a mask, use it, otherwise default to 32 bits */ - if (hwdev && hwdev->dma_mask) - mask = *hwdev->dma_mask; - return (addr & ~mask) != 0; + if (!io_tlb_overflow_buffer) + return; + + if (late_alloc) { + free_pages((unsigned long)io_tlb_overflow_buffer, + get_order(io_tlb_overflow)); + free_pages((unsigned long)io_tlb_orig_addr, + get_order(io_tlb_nslabs * sizeof(phys_addr_t))); + free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs * + sizeof(int))); + free_pages((unsigned long)io_tlb_start, + get_order(io_tlb_nslabs << IO_TLB_SHIFT)); + } else { + free_bootmem_late(__pa(io_tlb_overflow_buffer), + io_tlb_overflow); + free_bootmem_late(__pa(io_tlb_orig_addr), + io_tlb_nslabs * sizeof(phys_addr_t)); + free_bootmem_late(__pa(io_tlb_list), + io_tlb_nslabs * sizeof(int)); + free_bootmem_late(__pa(io_tlb_start), + io_tlb_nslabs << IO_TLB_SHIFT); + } +} + +static int is_swiotlb_buffer(phys_addr_t paddr) +{ + return paddr >= virt_to_phys(io_tlb_start) && + paddr < virt_to_phys(io_tlb_end); +} + +/* + * Bounce: copy the swiotlb buffer back to the original dma location + */ +static void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size, + enum dma_data_direction dir) +{ + unsigned long pfn = PFN_DOWN(phys); + + if (PageHighMem(pfn_to_page(pfn))) { + /* The buffer does not have a mapping. Map it in and copy */ + unsigned int offset = phys & ~PAGE_MASK; + char *buffer; + unsigned int sz = 0; + unsigned long flags; + + while (size) { + sz = min_t(size_t, PAGE_SIZE - offset, size); + + local_irq_save(flags); + buffer = kmap_atomic(pfn_to_page(pfn), + KM_BOUNCE_READ); + if (dir == DMA_TO_DEVICE) + memcpy(dma_addr, buffer + offset, sz); + else + memcpy(buffer + offset, dma_addr, sz); + kunmap_atomic(buffer, KM_BOUNCE_READ); + local_irq_restore(flags); + + size -= sz; + pfn++; + dma_addr += sz; + offset = 0; + } + } else { + if (dir == DMA_TO_DEVICE) + memcpy(dma_addr, phys_to_virt(phys), size); + else + memcpy(phys_to_virt(phys), dma_addr, size); + } } /* * Allocates bounce buffer and returns its kernel virtual address. */ static void * -map_single(struct device *hwdev, char *buffer, size_t size, int dir) +map_single(struct device *hwdev, phys_addr_t phys, size_t size, int dir) { unsigned long flags; char *dma_addr; unsigned int nslots, stride, index, wrap; int i; + unsigned long start_dma_addr; + unsigned long mask; + unsigned long offset_slots; + unsigned long max_slots; + + mask = dma_get_seg_boundary(hwdev); + start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start) & mask; + + offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; + + /* + * Carefully handle integer overflow which can occur when mask == ~0UL. + */ + max_slots = mask + 1 + ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT + : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT); /* * For mappings greater than a page, we limit the stride (and @@ -287,54 +397,60 @@ map_single(struct device *hwdev, char *buffer, size_t size, int dir) else stride = 1; - if (!nslots) - BUG(); + BUG_ON(!nslots); /* * Find suitable number of IO TLB entries size that will fit this * request and allocate a buffer from that IO TLB pool. */ spin_lock_irqsave(&io_tlb_lock, flags); - { - wrap = index = ALIGN(io_tlb_index, stride); + index = ALIGN(io_tlb_index, stride); + if (index >= io_tlb_nslabs) + index = 0; + wrap = index; + + do { + while (iommu_is_span_boundary(index, nslots, offset_slots, + max_slots)) { + index += stride; + if (index >= io_tlb_nslabs) + index = 0; + if (index == wrap) + goto not_found; + } - if (index >= io_tlb_nslabs) - wrap = index = 0; + /* + * If we find a slot that indicates we have 'nslots' number of + * contiguous buffers, we allocate the buffers from that slot + * and mark the entries as '0' indicating unavailable. + */ + if (io_tlb_list[index] >= nslots) { + int count = 0; + + for (i = index; i < (int) (index + nslots); i++) + io_tlb_list[i] = 0; + for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && io_tlb_list[i]; i--) + io_tlb_list[i] = ++count; + dma_addr = io_tlb_start + (index << IO_TLB_SHIFT); - do { /* - * If we find a slot that indicates we have 'nslots' - * number of contiguous buffers, we allocate the - * buffers from that slot and mark the entries as '0' - * indicating unavailable. + * Update the indices to avoid searching in the next + * round. */ - if (io_tlb_list[index] >= nslots) { - int count = 0; - - for (i = index; i < (int) (index + nslots); i++) - io_tlb_list[i] = 0; - for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--) - io_tlb_list[i] = ++count; - dma_addr = io_tlb_start + (index << IO_TLB_SHIFT); - - /* - * Update the indices to avoid searching in - * the next round. - */ - io_tlb_index = ((index + nslots) < io_tlb_nslabs - ? (index + nslots) : 0); - - goto found; - } - index += stride; - if (index >= io_tlb_nslabs) - index = 0; - } while (index != wrap); + io_tlb_index = ((index + nslots) < io_tlb_nslabs + ? (index + nslots) : 0); - spin_unlock_irqrestore(&io_tlb_lock, flags); - return NULL; - } - found: + goto found; + } + index += stride; + if (index >= io_tlb_nslabs) + index = 0; + } while (index != wrap); + +not_found: + spin_unlock_irqrestore(&io_tlb_lock, flags); + return NULL; +found: spin_unlock_irqrestore(&io_tlb_lock, flags); /* @@ -342,9 +458,10 @@ map_single(struct device *hwdev, char *buffer, size_t size, int dir) * This is needed when we sync the memory. Then we sync the buffer if * needed. */ - io_tlb_orig_addr[index] = buffer; + for (i = 0; i < nslots; i++) + io_tlb_orig_addr[index+i] = phys + (i << IO_TLB_SHIFT); if (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL) - memcpy(dma_addr, buffer, size); + swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE); return dma_addr; } @@ -353,26 +470,22 @@ map_single(struct device *hwdev, char *buffer, size_t size, int dir) * dma_addr is the kernel virtual address of the bounce buffer to unmap. */ static void -unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir) +do_unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir) { unsigned long flags; int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT; int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; - char *buffer = io_tlb_orig_addr[index]; + phys_addr_t phys = io_tlb_orig_addr[index]; /* * First, sync the memory before unmapping the entry */ - if (buffer && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) - /* - * bounce... copy the data back into the original buffer * and - * delete the bounce buffer. - */ - memcpy(buffer, dma_addr, size); + if (phys && ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL))) + swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE); /* * Return the buffer to the free list by setting the corresponding - * entries to indicate the number of contigous entries available. + * entries to indicate the number of contiguous entries available. * While returning the entries to the free list, we merge the entries * with slots below and above the pool being returned. */ @@ -397,43 +510,48 @@ unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir) } static void -sync_single(struct device *hwdev, char *dma_addr, size_t size, int dir) +sync_single(struct device *hwdev, char *dma_addr, size_t size, + int dir, int target) { int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT; - char *buffer = io_tlb_orig_addr[index]; - - /* - * bounce... copy the data back into/from the original buffer - * XXX How do you handle DMA_BIDIRECTIONAL here ? - */ - if (dir == DMA_FROM_DEVICE) - memcpy(buffer, dma_addr, size); - else if (dir == DMA_TO_DEVICE) - memcpy(dma_addr, buffer, size); - else + phys_addr_t phys = io_tlb_orig_addr[index]; + + phys += ((unsigned long)dma_addr & ((1 << IO_TLB_SHIFT) - 1)); + + switch (target) { + case SYNC_FOR_CPU: + if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)) + swiotlb_bounce(phys, dma_addr, size, DMA_FROM_DEVICE); + else + BUG_ON(dir != DMA_TO_DEVICE); + break; + case SYNC_FOR_DEVICE: + if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL)) + swiotlb_bounce(phys, dma_addr, size, DMA_TO_DEVICE); + else + BUG_ON(dir != DMA_FROM_DEVICE); + break; + default: BUG(); + } } void * swiotlb_alloc_coherent(struct device *hwdev, size_t size, - dma_addr_t *dma_handle, int flags) + dma_addr_t *dma_handle, gfp_t flags) { - unsigned long dev_addr; + dma_addr_t dev_addr; void *ret; int order = get_order(size); + u64 dma_mask = DMA_BIT_MASK(32); - /* - * XXX fix me: the DMA API should pass us an explicit DMA mask - * instead, or use ZONE_DMA32 (ia64 overloads ZONE_DMA to be a ~32 - * bit range instead of a 16MB one). - */ - flags |= GFP_DMA; + if (hwdev && hwdev->coherent_dma_mask) + dma_mask = hwdev->coherent_dma_mask; ret = (void *)__get_free_pages(flags, order); - if (ret && address_needs_mapping(hwdev, virt_to_phys(ret))) { + if (ret && swiotlb_virt_to_bus(hwdev, ret) + size - 1 > dma_mask) { /* * The allocated memory isn't reachable by the device. - * Fall back on swiotlb_map_single(). */ free_pages((unsigned long) ret, order); ret = NULL; @@ -441,43 +559,46 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size, if (!ret) { /* * We are either out of memory or the device can't DMA - * to GFP_DMA memory; fall back on - * swiotlb_map_single(), which will grab memory from - * the lowest available address range. + * to GFP_DMA memory; fall back on map_single(), which + * will grab memory from the lowest available address range. */ - dma_addr_t handle; - handle = swiotlb_map_single(NULL, NULL, size, DMA_FROM_DEVICE); - if (dma_mapping_error(handle)) + ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE); + if (!ret) return NULL; - - ret = phys_to_virt(handle); } memset(ret, 0, size); - dev_addr = virt_to_phys(ret); + dev_addr = swiotlb_virt_to_bus(hwdev, ret); /* Confirm address can be DMA'd by device */ - if (address_needs_mapping(hwdev, dev_addr)) { - printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016lx\n", - (unsigned long long)*hwdev->dma_mask, dev_addr); - panic("swiotlb_alloc_coherent: allocated memory is out of " - "range for device"); + if (dev_addr + size - 1 > dma_mask) { + printk("hwdev DMA mask = 0x%016Lx, dev_addr = 0x%016Lx\n", + (unsigned long long)dma_mask, + (unsigned long long)dev_addr); + + /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ + do_unmap_single(hwdev, ret, size, DMA_TO_DEVICE); + return NULL; } *dma_handle = dev_addr; return ret; } +EXPORT_SYMBOL(swiotlb_alloc_coherent); void swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr, - dma_addr_t dma_handle) + dma_addr_t dev_addr) { - if (!(vaddr >= (void *)io_tlb_start - && vaddr < (void *)io_tlb_end)) - free_pages((unsigned long) vaddr, get_order(size)); + phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); + + WARN_ON(irqs_disabled()); + if (!is_swiotlb_buffer(paddr)) + free_pages((unsigned long)vaddr, get_order(size)); else /* DMA_TO_DEVICE to avoid memcpy in unmap_single */ - swiotlb_unmap_single (hwdev, dma_handle, size, DMA_TO_DEVICE); + do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE); } +EXPORT_SYMBOL(swiotlb_free_coherent); static void swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) @@ -485,177 +606,189 @@ swiotlb_full(struct device *dev, size_t size, int dir, int do_panic) /* * Ran out of IOMMU space for this operation. This is very bad. * Unfortunately the drivers cannot handle this operation properly. - * unless they check for pci_dma_mapping_error (most don't) + * unless they check for dma_mapping_error (most don't) * When the mapping is small enough return a static buffer to limit * the damage, or panic when the transfer is too big. */ - printk(KERN_ERR "PCI-DMA: Out of SW-IOMMU space for %lu bytes at " - "device %s\n", size, dev ? dev->bus_id : "?"); - - if (size > io_tlb_overflow && do_panic) { - if (dir == PCI_DMA_FROMDEVICE || dir == PCI_DMA_BIDIRECTIONAL) - panic("PCI-DMA: Memory would be corrupted\n"); - if (dir == PCI_DMA_TODEVICE || dir == PCI_DMA_BIDIRECTIONAL) - panic("PCI-DMA: Random memory would be DMAed\n"); - } + printk(KERN_ERR "DMA: Out of SW-IOMMU space for %zu bytes at " + "device %s\n", size, dev ? dev_name(dev) : "?"); + + if (size <= io_tlb_overflow || !do_panic) + return; + + if (dir == DMA_BIDIRECTIONAL) + panic("DMA: Random memory could be DMA accessed\n"); + if (dir == DMA_FROM_DEVICE) + panic("DMA: Random memory could be DMA written\n"); + if (dir == DMA_TO_DEVICE) + panic("DMA: Random memory could be DMA read\n"); } /* * Map a single buffer of the indicated size for DMA in streaming mode. The - * PCI address to use is returned. + * physical address to use is returned. * * Once the device is given the dma address, the device owns this memory until - * either swiotlb_unmap_single or swiotlb_dma_sync_single is performed. + * either swiotlb_unmap_page or swiotlb_dma_sync_single is performed. */ -dma_addr_t -swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir) +dma_addr_t swiotlb_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) { - unsigned long dev_addr = virt_to_phys(ptr); + phys_addr_t phys = page_to_phys(page) + offset; + dma_addr_t dev_addr = phys_to_dma(dev, phys); void *map; - if (dir == DMA_NONE) - BUG(); + BUG_ON(dir == DMA_NONE); /* - * If the pointer passed in happens to be in the device's DMA window, + * If the address happens to be in the device's DMA window, * we can safely return the device addr and not worry about bounce * buffering it. */ - if (!address_needs_mapping(hwdev, dev_addr) && !swiotlb_force) + if (dma_capable(dev, dev_addr, size) && !swiotlb_force) return dev_addr; /* * Oh well, have to allocate and map a bounce buffer. */ - map = map_single(hwdev, ptr, size, dir); + map = map_single(dev, phys, size, dir); if (!map) { - swiotlb_full(hwdev, size, dir, 1); + swiotlb_full(dev, size, dir, 1); map = io_tlb_overflow_buffer; } - dev_addr = virt_to_phys(map); + dev_addr = swiotlb_virt_to_bus(dev, map); /* * Ensure that the address returned is DMA'ble */ - if (address_needs_mapping(hwdev, dev_addr)) + if (!dma_capable(dev, dev_addr, size)) panic("map_single: bounce buffer is not DMA'ble"); return dev_addr; } - -/* - * Since DMA is i-cache coherent, any (complete) pages that were written via - * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to - * flush them when they get mapped into an executable vm-area. - */ -static void -mark_clean(void *addr, size_t size) -{ - unsigned long pg_addr, end; - - pg_addr = PAGE_ALIGN((unsigned long) addr); - end = (unsigned long) addr + size; - while (pg_addr + PAGE_SIZE <= end) { - struct page *page = virt_to_page(pg_addr); - set_bit(PG_arch_1, &page->flags); - pg_addr += PAGE_SIZE; - } -} +EXPORT_SYMBOL_GPL(swiotlb_map_page); /* * Unmap a single streaming mode DMA translation. The dma_addr and size must - * match what was provided for in a previous swiotlb_map_single call. All + * match what was provided for in a previous swiotlb_map_page call. All * other usages are undefined. * * After this call, reads by the cpu to the buffer are guaranteed to see * whatever the device wrote there. */ -void -swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr, size_t size, - int dir) +static void unmap_single(struct device *hwdev, dma_addr_t dev_addr, + size_t size, int dir) { - char *dma_addr = phys_to_virt(dev_addr); + phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); - if (dir == DMA_NONE) - BUG(); - if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end) - unmap_single(hwdev, dma_addr, size, dir); - else if (dir == DMA_FROM_DEVICE) - mark_clean(dma_addr, size); + BUG_ON(dir == DMA_NONE); + + if (is_swiotlb_buffer(paddr)) { + do_unmap_single(hwdev, phys_to_virt(paddr), size, dir); + return; + } + + if (dir != DMA_FROM_DEVICE) + return; + + /* + * phys_to_virt doesn't work with hihgmem page but we could + * call dma_mark_clean() with hihgmem page here. However, we + * are fine since dma_mark_clean() is null on POWERPC. We can + * make dma_mark_clean() take a physical address if necessary. + */ + dma_mark_clean(phys_to_virt(paddr), size); +} + +void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr, + size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + unmap_single(hwdev, dev_addr, size, dir); } +EXPORT_SYMBOL_GPL(swiotlb_unmap_page); /* * Make physical memory consistent for a single streaming mode DMA translation * after a transfer. * - * If you perform a swiotlb_map_single() but wish to interrogate the buffer - * using the cpu, yet do not wish to teardown the PCI dma mapping, you must - * call this function before doing so. At the next point you give the PCI dma + * If you perform a swiotlb_map_page() but wish to interrogate the buffer + * using the cpu, yet do not wish to teardown the dma mapping, you must + * call this function before doing so. At the next point you give the dma * address back to the card, you must first perform a * swiotlb_dma_sync_for_device, and then the device again owns the buffer */ -static inline void +static void swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr, - size_t size, int dir) + size_t size, int dir, int target) { - char *dma_addr = phys_to_virt(dev_addr); + phys_addr_t paddr = dma_to_phys(hwdev, dev_addr); - if (dir == DMA_NONE) - BUG(); - if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end) - sync_single(hwdev, dma_addr, size, dir); - else if (dir == DMA_FROM_DEVICE) - mark_clean(dma_addr, size); + BUG_ON(dir == DMA_NONE); + + if (is_swiotlb_buffer(paddr)) { + sync_single(hwdev, phys_to_virt(paddr), size, dir, target); + return; + } + + if (dir != DMA_FROM_DEVICE) + return; + + dma_mark_clean(phys_to_virt(paddr), size); } void swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr, - size_t size, int dir) + size_t size, enum dma_data_direction dir) { - swiotlb_sync_single(hwdev, dev_addr, size, dir); + swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_CPU); } +EXPORT_SYMBOL(swiotlb_sync_single_for_cpu); void swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr, - size_t size, int dir) + size_t size, enum dma_data_direction dir) { - swiotlb_sync_single(hwdev, dev_addr, size, dir); + swiotlb_sync_single(hwdev, dev_addr, size, dir, SYNC_FOR_DEVICE); } +EXPORT_SYMBOL(swiotlb_sync_single_for_device); /* * Same as above, but for a sub-range of the mapping. */ -static inline void +static void swiotlb_sync_single_range(struct device *hwdev, dma_addr_t dev_addr, - unsigned long offset, size_t size, int dir) + unsigned long offset, size_t size, + int dir, int target) { - char *dma_addr = phys_to_virt(dev_addr) + offset; - - if (dir == DMA_NONE) - BUG(); - if (dma_addr >= io_tlb_start && dma_addr < io_tlb_end) - sync_single(hwdev, dma_addr, size, dir); - else if (dir == DMA_FROM_DEVICE) - mark_clean(dma_addr, size); + swiotlb_sync_single(hwdev, dev_addr + offset, size, dir, target); } void swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr, - unsigned long offset, size_t size, int dir) + unsigned long offset, size_t size, + enum dma_data_direction dir) { - swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir); + swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir, + SYNC_FOR_CPU); } +EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu); void swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr, - unsigned long offset, size_t size, int dir) + unsigned long offset, size_t size, + enum dma_data_direction dir) { - swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir); + swiotlb_sync_single_range(hwdev, dev_addr, offset, size, dir, + SYNC_FOR_DEVICE); } +EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device); /* * Map a set of buffers described by scatterlist in streaming mode for DMA. - * This is the scatter-gather version of the above swiotlb_map_single + * This is the scatter-gather version of the above swiotlb_map_page * interface. Here the scatter gather list elements are each tagged with the * appropriate dma address and length. They are obtained via * sg_dma_{address,length}(SG). @@ -666,59 +799,78 @@ swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr, * The routine returns the number of addr/length pairs actually * used, at most nents. * - * Device ownership issues as mentioned above for swiotlb_map_single are the + * Device ownership issues as mentioned above for swiotlb_map_page are the * same here. */ int -swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nelems, - int dir) +swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems, + enum dma_data_direction dir, struct dma_attrs *attrs) { - void *addr; - unsigned long dev_addr; + struct scatterlist *sg; int i; - if (dir == DMA_NONE) - BUG(); + BUG_ON(dir == DMA_NONE); - for (i = 0; i < nelems; i++, sg++) { - addr = SG_ENT_VIRT_ADDRESS(sg); - dev_addr = virt_to_phys(addr); - if (swiotlb_force || address_needs_mapping(hwdev, dev_addr)) { - sg->dma_address = (dma_addr_t) virt_to_phys(map_single(hwdev, addr, sg->length, dir)); - if (!sg->dma_address) { + for_each_sg(sgl, sg, nelems, i) { + phys_addr_t paddr = sg_phys(sg); + dma_addr_t dev_addr = phys_to_dma(hwdev, paddr); + + if (swiotlb_force || + !dma_capable(hwdev, dev_addr, sg->length)) { + void *map = map_single(hwdev, sg_phys(sg), + sg->length, dir); + if (!map) { /* Don't panic here, we expect map_sg users to do proper error handling. */ swiotlb_full(hwdev, sg->length, dir, 0); - swiotlb_unmap_sg(hwdev, sg - i, i, dir); - sg[0].dma_length = 0; + swiotlb_unmap_sg_attrs(hwdev, sgl, i, dir, + attrs); + sgl[0].dma_length = 0; return 0; } + sg->dma_address = swiotlb_virt_to_bus(hwdev, map); } else sg->dma_address = dev_addr; sg->dma_length = sg->length; } return nelems; } +EXPORT_SYMBOL(swiotlb_map_sg_attrs); + +int +swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems, + int dir) +{ + return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL); +} +EXPORT_SYMBOL(swiotlb_map_sg); /* * Unmap a set of streaming mode DMA translations. Again, cpu read rules - * concerning calls here are the same as for swiotlb_unmap_single() above. + * concerning calls here are the same as for swiotlb_unmap_page() above. */ void -swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nelems, - int dir) +swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl, + int nelems, enum dma_data_direction dir, struct dma_attrs *attrs) { + struct scatterlist *sg; int i; - if (dir == DMA_NONE) - BUG(); + BUG_ON(dir == DMA_NONE); + + for_each_sg(sgl, sg, nelems, i) + unmap_single(hwdev, sg->dma_address, sg->dma_length, dir); - for (i = 0; i < nelems; i++, sg++) - if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg)) - unmap_single(hwdev, (void *) phys_to_virt(sg->dma_address), sg->dma_length, dir); - else if (dir == DMA_FROM_DEVICE) - mark_clean(SG_ENT_VIRT_ADDRESS(sg), sg->dma_length); } +EXPORT_SYMBOL(swiotlb_unmap_sg_attrs); + +void +swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems, + int dir) +{ + return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL); +} +EXPORT_SYMBOL(swiotlb_unmap_sg); /* * Make physical memory consistent for a set of streaming mode DMA translations @@ -727,65 +879,50 @@ swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nelems, * The same as swiotlb_sync_single_* but for a scatter-gather list, same rules * and usage. */ -static inline void -swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sg, - int nelems, int dir) +static void +swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl, + int nelems, int dir, int target) { + struct scatterlist *sg; int i; - if (dir == DMA_NONE) - BUG(); - - for (i = 0; i < nelems; i++, sg++) - if (sg->dma_address != SG_ENT_PHYS_ADDRESS(sg)) - sync_single(hwdev, (void *) sg->dma_address, - sg->dma_length, dir); + for_each_sg(sgl, sg, nelems, i) + swiotlb_sync_single(hwdev, sg->dma_address, + sg->dma_length, dir, target); } void swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg, - int nelems, int dir) + int nelems, enum dma_data_direction dir) { - swiotlb_sync_sg(hwdev, sg, nelems, dir); + swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_CPU); } +EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu); void swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg, - int nelems, int dir) + int nelems, enum dma_data_direction dir) { - swiotlb_sync_sg(hwdev, sg, nelems, dir); + swiotlb_sync_sg(hwdev, sg, nelems, dir, SYNC_FOR_DEVICE); } +EXPORT_SYMBOL(swiotlb_sync_sg_for_device); int -swiotlb_dma_mapping_error(dma_addr_t dma_addr) +swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr) { - return (dma_addr == virt_to_phys(io_tlb_overflow_buffer)); + return (dma_addr == swiotlb_virt_to_bus(hwdev, io_tlb_overflow_buffer)); } +EXPORT_SYMBOL(swiotlb_dma_mapping_error); /* - * Return whether the given PCI device DMA address mask can be supported + * Return whether the given device DMA address mask can be supported * properly. For example, if your device can only drive the low 24-bits - * during PCI bus mastering, then you would pass 0x00ffffff as the mask to + * during bus mastering, then you would pass 0x00ffffff as the mask to * this function. */ int -swiotlb_dma_supported (struct device *hwdev, u64 mask) +swiotlb_dma_supported(struct device *hwdev, u64 mask) { - return (virt_to_phys (io_tlb_end) - 1) <= mask; + return swiotlb_virt_to_bus(hwdev, io_tlb_end - 1) <= mask; } - -EXPORT_SYMBOL(swiotlb_init); -EXPORT_SYMBOL(swiotlb_map_single); -EXPORT_SYMBOL(swiotlb_unmap_single); -EXPORT_SYMBOL(swiotlb_map_sg); -EXPORT_SYMBOL(swiotlb_unmap_sg); -EXPORT_SYMBOL(swiotlb_sync_single_for_cpu); -EXPORT_SYMBOL(swiotlb_sync_single_for_device); -EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_cpu); -EXPORT_SYMBOL_GPL(swiotlb_sync_single_range_for_device); -EXPORT_SYMBOL(swiotlb_sync_sg_for_cpu); -EXPORT_SYMBOL(swiotlb_sync_sg_for_device); -EXPORT_SYMBOL(swiotlb_dma_mapping_error); -EXPORT_SYMBOL(swiotlb_alloc_coherent); -EXPORT_SYMBOL(swiotlb_free_coherent); EXPORT_SYMBOL(swiotlb_dma_supported);