Merge branch 'stable/swiotlb-0.8.3' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb-2.6
* 'stable/swiotlb-0.8.3' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb-2.6: swiotlb: Make swiotlb bookkeeping functions visible in the header file. swiotlb: search and replace "int dir" with "enum dma_data_direction dir" swiotlb: Make internal bookkeeping functions have 'swiotlb_tbl' prefix. swiotlb: add the swiotlb initialization function with iotlb memory swiotlb: add swiotlb_tbl_map_single library functionhifive-unleashed-5.1
Linus Torvalds
commit
4a35cee066
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@ -23,6 +23,29 @@ extern int swiotlb_force;
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#define IO_TLB_SHIFT 11
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extern void swiotlb_init(int verbose);
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extern void swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose);
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/*
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* Enumeration for sync targets
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*/
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enum dma_sync_target {
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SYNC_FOR_CPU = 0,
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SYNC_FOR_DEVICE = 1,
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};
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extern void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
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phys_addr_t phys, size_t size,
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enum dma_data_direction dir);
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extern void swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr,
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size_t size, enum dma_data_direction dir);
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extern void swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr,
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size_t size, enum dma_data_direction dir,
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enum dma_sync_target target);
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/* Accessory functions. */
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extern void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
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enum dma_data_direction dir);
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extern void
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*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
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@ -42,11 +65,11 @@ extern void swiotlb_unmap_page(struct device *hwdev, dma_addr_t dev_addr,
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extern int
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swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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int direction);
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enum dma_data_direction dir);
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extern void
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swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
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int direction);
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enum dma_data_direction dir);
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extern int
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swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
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137
lib/swiotlb.c
137
lib/swiotlb.c
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@ -50,19 +50,11 @@
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*/
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#define IO_TLB_MIN_SLABS ((1<<20) >> IO_TLB_SHIFT)
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/*
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* Enumeration for sync targets
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*/
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enum dma_sync_target {
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SYNC_FOR_CPU = 0,
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SYNC_FOR_DEVICE = 1,
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};
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int swiotlb_force;
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/*
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* Used to do a quick range check in unmap_single and
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* sync_single_*, to see if the memory was in fact allocated by this
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* Used to do a quick range check in swiotlb_tbl_unmap_single and
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* swiotlb_tbl_sync_single_*, to see if the memory was in fact allocated by this
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* API.
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*/
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static char *io_tlb_start, *io_tlb_end;
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@ -140,28 +132,14 @@ void swiotlb_print_info(void)
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(unsigned long long)pend);
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}
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/*
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* Statically reserve bounce buffer space and initialize bounce buffer data
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* structures for the software IO TLB used to implement the DMA API.
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*/
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void __init
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swiotlb_init_with_default_size(size_t default_size, int verbose)
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void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
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{
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unsigned long i, bytes;
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if (!io_tlb_nslabs) {
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io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
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io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
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}
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bytes = nslabs << IO_TLB_SHIFT;
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bytes = io_tlb_nslabs << IO_TLB_SHIFT;
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/*
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* Get IO TLB memory from the low pages
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*/
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io_tlb_start = alloc_bootmem_low_pages(bytes);
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if (!io_tlb_start)
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panic("Cannot allocate SWIOTLB buffer");
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io_tlb_nslabs = nslabs;
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io_tlb_start = tlb;
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io_tlb_end = io_tlb_start + bytes;
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/*
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@ -185,6 +163,32 @@ swiotlb_init_with_default_size(size_t default_size, int verbose)
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swiotlb_print_info();
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}
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/*
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* Statically reserve bounce buffer space and initialize bounce buffer data
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* structures for the software IO TLB used to implement the DMA API.
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*/
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void __init
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swiotlb_init_with_default_size(size_t default_size, int verbose)
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{
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unsigned long bytes;
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if (!io_tlb_nslabs) {
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io_tlb_nslabs = (default_size >> IO_TLB_SHIFT);
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io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
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}
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bytes = io_tlb_nslabs << IO_TLB_SHIFT;
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/*
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* Get IO TLB memory from the low pages
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*/
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io_tlb_start = alloc_bootmem_low_pages(bytes);
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if (!io_tlb_start)
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panic("Cannot allocate SWIOTLB buffer");
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swiotlb_init_with_tbl(io_tlb_start, io_tlb_nslabs, verbose);
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}
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void __init
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swiotlb_init(int verbose)
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{
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@ -323,8 +327,8 @@ static int is_swiotlb_buffer(phys_addr_t paddr)
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/*
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* Bounce: copy the swiotlb buffer back to the original dma location
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*/
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static void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
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enum dma_data_direction dir)
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void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
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enum dma_data_direction dir)
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{
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unsigned long pfn = PFN_DOWN(phys);
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@ -360,26 +364,25 @@ static void swiotlb_bounce(phys_addr_t phys, char *dma_addr, size_t size,
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memcpy(phys_to_virt(phys), dma_addr, size);
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}
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}
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EXPORT_SYMBOL_GPL(swiotlb_bounce);
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/*
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* Allocates bounce buffer and returns its kernel virtual address.
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*/
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static void *
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map_single(struct device *hwdev, phys_addr_t phys, size_t size, int dir)
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void *swiotlb_tbl_map_single(struct device *hwdev, dma_addr_t tbl_dma_addr,
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phys_addr_t phys, size_t size,
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enum dma_data_direction dir)
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{
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unsigned long flags;
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char *dma_addr;
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unsigned int nslots, stride, index, wrap;
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int i;
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unsigned long start_dma_addr;
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unsigned long mask;
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unsigned long offset_slots;
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unsigned long max_slots;
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mask = dma_get_seg_boundary(hwdev);
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start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start) & mask;
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offset_slots = ALIGN(start_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
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tbl_dma_addr &= mask;
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offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
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/*
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* Carefully handle integer overflow which can occur when mask == ~0UL.
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@ -466,12 +469,27 @@ found:
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return dma_addr;
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}
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EXPORT_SYMBOL_GPL(swiotlb_tbl_map_single);
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/*
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* Allocates bounce buffer and returns its kernel virtual address.
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*/
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static void *
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map_single(struct device *hwdev, phys_addr_t phys, size_t size,
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enum dma_data_direction dir)
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{
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dma_addr_t start_dma_addr = swiotlb_virt_to_bus(hwdev, io_tlb_start);
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return swiotlb_tbl_map_single(hwdev, start_dma_addr, phys, size, dir);
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}
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/*
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* dma_addr is the kernel virtual address of the bounce buffer to unmap.
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*/
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static void
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do_unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir)
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void
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swiotlb_tbl_unmap_single(struct device *hwdev, char *dma_addr, size_t size,
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enum dma_data_direction dir)
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{
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unsigned long flags;
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int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
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@ -509,10 +527,12 @@ do_unmap_single(struct device *hwdev, char *dma_addr, size_t size, int dir)
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}
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spin_unlock_irqrestore(&io_tlb_lock, flags);
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}
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EXPORT_SYMBOL_GPL(swiotlb_tbl_unmap_single);
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static void
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sync_single(struct device *hwdev, char *dma_addr, size_t size,
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int dir, int target)
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void
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swiotlb_tbl_sync_single(struct device *hwdev, char *dma_addr, size_t size,
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enum dma_data_direction dir,
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enum dma_sync_target target)
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{
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int index = (dma_addr - io_tlb_start) >> IO_TLB_SHIFT;
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phys_addr_t phys = io_tlb_orig_addr[index];
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@ -536,6 +556,7 @@ sync_single(struct device *hwdev, char *dma_addr, size_t size,
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BUG();
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}
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}
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EXPORT_SYMBOL_GPL(swiotlb_tbl_sync_single);
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void *
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swiotlb_alloc_coherent(struct device *hwdev, size_t size,
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@ -559,8 +580,8 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
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}
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if (!ret) {
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/*
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* We are either out of memory or the device can't DMA
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* to GFP_DMA memory; fall back on map_single(), which
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* We are either out of memory or the device can't DMA to
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* GFP_DMA memory; fall back on map_single(), which
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* will grab memory from the lowest available address range.
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*/
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ret = map_single(hwdev, 0, size, DMA_FROM_DEVICE);
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@ -578,7 +599,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
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(unsigned long long)dev_addr);
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/* DMA_TO_DEVICE to avoid memcpy in unmap_single */
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do_unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
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swiotlb_tbl_unmap_single(hwdev, ret, size, DMA_TO_DEVICE);
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return NULL;
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}
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*dma_handle = dev_addr;
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@ -596,13 +617,14 @@ swiotlb_free_coherent(struct device *hwdev, size_t size, void *vaddr,
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if (!is_swiotlb_buffer(paddr))
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free_pages((unsigned long)vaddr, get_order(size));
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else
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/* DMA_TO_DEVICE to avoid memcpy in unmap_single */
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do_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
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/* DMA_TO_DEVICE to avoid memcpy in swiotlb_tbl_unmap_single */
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swiotlb_tbl_unmap_single(hwdev, vaddr, size, DMA_TO_DEVICE);
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}
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EXPORT_SYMBOL(swiotlb_free_coherent);
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static void
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swiotlb_full(struct device *dev, size_t size, int dir, int do_panic)
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swiotlb_full(struct device *dev, size_t size, enum dma_data_direction dir,
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int do_panic)
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{
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/*
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* Ran out of IOMMU space for this operation. This is very bad.
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@ -680,14 +702,14 @@ EXPORT_SYMBOL_GPL(swiotlb_map_page);
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* whatever the device wrote there.
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*/
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static void unmap_single(struct device *hwdev, dma_addr_t dev_addr,
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size_t size, int dir)
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size_t size, enum dma_data_direction dir)
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{
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phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
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BUG_ON(dir == DMA_NONE);
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if (is_swiotlb_buffer(paddr)) {
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do_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
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swiotlb_tbl_unmap_single(hwdev, phys_to_virt(paddr), size, dir);
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return;
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}
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@ -723,14 +745,16 @@ EXPORT_SYMBOL_GPL(swiotlb_unmap_page);
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*/
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static void
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swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
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size_t size, int dir, int target)
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size_t size, enum dma_data_direction dir,
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enum dma_sync_target target)
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{
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phys_addr_t paddr = dma_to_phys(hwdev, dev_addr);
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BUG_ON(dir == DMA_NONE);
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if (is_swiotlb_buffer(paddr)) {
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sync_single(hwdev, phys_to_virt(paddr), size, dir, target);
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swiotlb_tbl_sync_single(hwdev, phys_to_virt(paddr), size, dir,
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target);
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return;
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}
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@ -809,7 +833,7 @@ EXPORT_SYMBOL(swiotlb_map_sg_attrs);
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int
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swiotlb_map_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
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int dir)
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enum dma_data_direction dir)
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{
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return swiotlb_map_sg_attrs(hwdev, sgl, nelems, dir, NULL);
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}
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@ -836,7 +860,7 @@ EXPORT_SYMBOL(swiotlb_unmap_sg_attrs);
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void
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swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sgl, int nelems,
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int dir)
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enum dma_data_direction dir)
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{
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return swiotlb_unmap_sg_attrs(hwdev, sgl, nelems, dir, NULL);
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}
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@ -851,7 +875,8 @@ EXPORT_SYMBOL(swiotlb_unmap_sg);
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*/
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static void
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swiotlb_sync_sg(struct device *hwdev, struct scatterlist *sgl,
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int nelems, int dir, int target)
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int nelems, enum dma_data_direction dir,
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enum dma_sync_target target)
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{
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struct scatterlist *sg;
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int i;
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