| /* |
| * 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 <stdio.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 |