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Diffstat (limited to 'qemu/include/sysemu/dma.h')
| -rw-r--r-- | qemu/include/sysemu/dma.h | 220 |
1 files changed, 0 insertions, 220 deletions
diff --git a/qemu/include/sysemu/dma.h b/qemu/include/sysemu/dma.h deleted file mode 100644 index b0fbb9bb3..000000000 --- a/qemu/include/sysemu/dma.h +++ /dev/null @@ -1,220 +0,0 @@ -/* - * DMA helper functions - * - * Copyright (c) 2009 Red Hat - * - * This work is licensed under the terms of the GNU General Public License - * (GNU GPL), version 2 or later. - */ - -#ifndef DMA_H -#define DMA_H - -#include "exec/memory.h" -#include "exec/address-spaces.h" -#include "hw/hw.h" -#include "block/block.h" -#include "block/accounting.h" -#include "sysemu/kvm.h" - -typedef struct ScatterGatherEntry ScatterGatherEntry; - -typedef enum { - DMA_DIRECTION_TO_DEVICE = 0, - DMA_DIRECTION_FROM_DEVICE = 1, -} DMADirection; - -struct QEMUSGList { - ScatterGatherEntry *sg; - int nsg; - int nalloc; - size_t size; - DeviceState *dev; - AddressSpace *as; -}; - -#ifndef CONFIG_USER_ONLY - -/* - * When an IOMMU is present, bus addresses become distinct from - * CPU/memory physical addresses and may be a different size. Because - * the IOVA size depends more on the bus than on the platform, we more - * or less have to treat these as 64-bit always to cover all (or at - * least most) cases. - */ -typedef uint64_t dma_addr_t; - -#define DMA_ADDR_BITS 64 -#define DMA_ADDR_FMT "%" PRIx64 - -static inline void dma_barrier(AddressSpace *as, DMADirection dir) -{ - /* - * This is called before DMA read and write operations - * unless the _relaxed form is used and is responsible - * for providing some sane ordering of accesses vs - * concurrently running VCPUs. - * - * Users of map(), unmap() or lower level st/ld_* - * operations are responsible for providing their own - * ordering via barriers. - * - * This primitive implementation does a simple smp_mb() - * before each operation which provides pretty much full - * ordering. - * - * A smarter implementation can be devised if needed to - * use lighter barriers based on the direction of the - * transfer, the DMA context, etc... - */ - if (kvm_enabled()) { - smp_mb(); - } -} - -/* Checks that the given range of addresses is valid for DMA. This is - * useful for certain cases, but usually you should just use - * dma_memory_{read,write}() and check for errors */ -static inline bool dma_memory_valid(AddressSpace *as, - dma_addr_t addr, dma_addr_t len, - DMADirection dir) -{ - return address_space_access_valid(as, addr, len, - dir == DMA_DIRECTION_FROM_DEVICE); -} - -static inline int dma_memory_rw_relaxed(AddressSpace *as, dma_addr_t addr, - void *buf, dma_addr_t len, - DMADirection dir) -{ - return (bool)address_space_rw(as, addr, MEMTXATTRS_UNSPECIFIED, - buf, len, dir == DMA_DIRECTION_FROM_DEVICE); -} - -static inline int dma_memory_read_relaxed(AddressSpace *as, dma_addr_t addr, - void *buf, dma_addr_t len) -{ - return dma_memory_rw_relaxed(as, addr, buf, len, DMA_DIRECTION_TO_DEVICE); -} - -static inline int dma_memory_write_relaxed(AddressSpace *as, dma_addr_t addr, - const void *buf, dma_addr_t len) -{ - return dma_memory_rw_relaxed(as, addr, (void *)buf, len, - DMA_DIRECTION_FROM_DEVICE); -} - -static inline int dma_memory_rw(AddressSpace *as, dma_addr_t addr, - void *buf, dma_addr_t len, - DMADirection dir) -{ - dma_barrier(as, dir); - - return dma_memory_rw_relaxed(as, addr, buf, len, dir); -} - -static inline int dma_memory_read(AddressSpace *as, dma_addr_t addr, - void *buf, dma_addr_t len) -{ - return dma_memory_rw(as, addr, buf, len, DMA_DIRECTION_TO_DEVICE); -} - -static inline int dma_memory_write(AddressSpace *as, dma_addr_t addr, - const void *buf, dma_addr_t len) -{ - return dma_memory_rw(as, addr, (void *)buf, len, - DMA_DIRECTION_FROM_DEVICE); -} - -int dma_memory_set(AddressSpace *as, dma_addr_t addr, uint8_t c, dma_addr_t len); - -static inline void *dma_memory_map(AddressSpace *as, - dma_addr_t addr, dma_addr_t *len, - DMADirection dir) -{ - hwaddr xlen = *len; - void *p; - - p = address_space_map(as, addr, &xlen, dir == DMA_DIRECTION_FROM_DEVICE); - *len = xlen; - return p; -} - -static inline void dma_memory_unmap(AddressSpace *as, - void *buffer, dma_addr_t len, - DMADirection dir, dma_addr_t access_len) -{ - address_space_unmap(as, buffer, (hwaddr)len, - dir == DMA_DIRECTION_FROM_DEVICE, access_len); -} - -#define DEFINE_LDST_DMA(_lname, _sname, _bits, _end) \ - static inline uint##_bits##_t ld##_lname##_##_end##_dma(AddressSpace *as, \ - dma_addr_t addr) \ - { \ - uint##_bits##_t val; \ - dma_memory_read(as, addr, &val, (_bits) / 8); \ - return _end##_bits##_to_cpu(val); \ - } \ - static inline void st##_sname##_##_end##_dma(AddressSpace *as, \ - dma_addr_t addr, \ - uint##_bits##_t val) \ - { \ - val = cpu_to_##_end##_bits(val); \ - dma_memory_write(as, addr, &val, (_bits) / 8); \ - } - -static inline uint8_t ldub_dma(AddressSpace *as, dma_addr_t addr) -{ - uint8_t val; - - dma_memory_read(as, addr, &val, 1); - return val; -} - -static inline void stb_dma(AddressSpace *as, dma_addr_t addr, uint8_t val) -{ - dma_memory_write(as, addr, &val, 1); -} - -DEFINE_LDST_DMA(uw, w, 16, le); -DEFINE_LDST_DMA(l, l, 32, le); -DEFINE_LDST_DMA(q, q, 64, le); -DEFINE_LDST_DMA(uw, w, 16, be); -DEFINE_LDST_DMA(l, l, 32, be); -DEFINE_LDST_DMA(q, q, 64, be); - -#undef DEFINE_LDST_DMA - -struct ScatterGatherEntry { - dma_addr_t base; - dma_addr_t len; -}; - -void qemu_sglist_init(QEMUSGList *qsg, DeviceState *dev, int alloc_hint, - AddressSpace *as); -void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len); -void qemu_sglist_destroy(QEMUSGList *qsg); -#endif - -typedef BlockAIOCB *DMAIOFunc(BlockBackend *blk, int64_t sector_num, - QEMUIOVector *iov, int nb_sectors, - BlockCompletionFunc *cb, void *opaque); - -BlockAIOCB *dma_blk_io(BlockBackend *blk, - QEMUSGList *sg, uint64_t sector_num, - DMAIOFunc *io_func, BlockCompletionFunc *cb, - void *opaque, DMADirection dir); -BlockAIOCB *dma_blk_read(BlockBackend *blk, - QEMUSGList *sg, uint64_t sector, - BlockCompletionFunc *cb, void *opaque); -BlockAIOCB *dma_blk_write(BlockBackend *blk, - QEMUSGList *sg, uint64_t sector, - BlockCompletionFunc *cb, void *opaque); -uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg); -uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg); - -void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie, - QEMUSGList *sg, enum BlockAcctType type); - -#endif |