diff options
Diffstat (limited to 'kernel/dma')
| -rw-r--r-- | kernel/dma/coherent.c | 2 | ||||
| -rw-r--r-- | kernel/dma/debug.c | 6 | ||||
| -rw-r--r-- | kernel/dma/swiotlb.c | 23 |
3 files changed, 18 insertions, 13 deletions
diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index 5b5b6c7ec7f2..794e76b03b34 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -111,7 +111,7 @@ static int dma_assign_coherent_memory(struct device *dev, * Declare a region of memory to be handed out by dma_alloc_coherent() when it * is asked for coherent memory for this device. This shall only be used * from platform code, usually based on the device tree description. - * + * * phys_addr is the CPU physical address to which the memory is currently * assigned (this will be ioremapped so the CPU can access the region). * diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c index 14de1271463f..dadae6255d05 100644 --- a/kernel/dma/debug.c +++ b/kernel/dma/debug.c @@ -566,11 +566,9 @@ static void add_dma_entry(struct dma_debug_entry *entry) if (rc == -ENOMEM) { pr_err("cacheline tracking ENOMEM, dma-debug disabled\n"); global_disable = true; + } else if (rc == -EEXIST) { + pr_err("cacheline tracking EEXIST, overlapping mappings aren't supported\n"); } - - /* TODO: report -EEXIST errors here as overlapping mappings are - * not supported by the DMA API - */ } static int dma_debug_create_entries(gfp_t gfp) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index 8ca7d505d61c..e50df8d8f87e 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -335,6 +335,14 @@ void __init swiotlb_exit(void) } /* + * Return the offset into a iotlb slot required to keep the device happy. + */ +static unsigned int swiotlb_align_offset(struct device *dev, u64 addr) +{ + return addr & dma_get_min_align_mask(dev) & (IO_TLB_SIZE - 1); +} + +/* * Bounce: copy the swiotlb buffer from or back to the original dma location */ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size, @@ -346,10 +354,17 @@ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size size_t alloc_size = mem->slots[index].alloc_size; unsigned long pfn = PFN_DOWN(orig_addr); unsigned char *vaddr = phys_to_virt(tlb_addr); + unsigned int tlb_offset; if (orig_addr == INVALID_PHYS_ADDR) return; + tlb_offset = (tlb_addr & (IO_TLB_SIZE - 1)) - + swiotlb_align_offset(dev, orig_addr); + + orig_addr += tlb_offset; + alloc_size -= tlb_offset; + if (size > alloc_size) { dev_WARN_ONCE(dev, 1, "Buffer overflow detected. Allocation size: %zu. Mapping size: %zu.\n", @@ -391,14 +406,6 @@ static void swiotlb_bounce(struct device *dev, phys_addr_t tlb_addr, size_t size #define slot_addr(start, idx) ((start) + ((idx) << IO_TLB_SHIFT)) /* - * Return the offset into a iotlb slot required to keep the device happy. - */ -static unsigned int swiotlb_align_offset(struct device *dev, u64 addr) -{ - return addr & dma_get_min_align_mask(dev) & (IO_TLB_SIZE - 1); -} - -/* * Carefully handle integer overflow which can occur when boundary_mask == ~0UL. */ static inline unsigned long get_max_slots(unsigned long boundary_mask) |