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Diffstat (limited to 'include/sysemu/dma.h')
| -rw-r--r-- | include/sysemu/dma.h | 324 |
1 files changed, 0 insertions, 324 deletions
diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h deleted file mode 100644 index a1ac5bc..0000000 --- a/include/sysemu/dma.h +++ /dev/null @@ -1,324 +0,0 @@ -/* - * DMA helper functions - * - * Copyright (c) 2009, 2020 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 "block/block.h" -#include "block/accounting.h" - -typedef enum { - DMA_DIRECTION_TO_DEVICE = 0, - DMA_DIRECTION_FROM_DEVICE = 1, -} DMADirection; - -/* - * 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 - -typedef struct ScatterGatherEntry ScatterGatherEntry; - -struct QEMUSGList { - ScatterGatherEntry *sg; - int nsg; - int nalloc; - dma_addr_t size; - DeviceState *dev; - AddressSpace *as; -}; - -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... - */ - 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, MemTxAttrs attrs) -{ - return address_space_access_valid(as, addr, len, - dir == DMA_DIRECTION_FROM_DEVICE, - attrs); -} - -static inline MemTxResult dma_memory_rw_relaxed(AddressSpace *as, - dma_addr_t addr, - void *buf, dma_addr_t len, - DMADirection dir, - MemTxAttrs attrs) -{ - return address_space_rw(as, addr, attrs, - buf, len, dir == DMA_DIRECTION_FROM_DEVICE); -} - -static inline MemTxResult 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, - MEMTXATTRS_UNSPECIFIED); -} - -static inline MemTxResult 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, - MEMTXATTRS_UNSPECIFIED); -} - -/** - * dma_memory_rw: Read from or write to an address space from DMA controller. - * - * Return a MemTxResult indicating whether the operation succeeded - * or failed (eg unassigned memory, device rejected the transaction, - * IOMMU fault). - * - * @as: #AddressSpace to be accessed - * @addr: address within that address space - * @buf: buffer with the data transferred - * @len: the number of bytes to read or write - * @dir: indicates the transfer direction - * @attrs: memory transaction attributes - */ -static inline MemTxResult dma_memory_rw(AddressSpace *as, dma_addr_t addr, - void *buf, dma_addr_t len, - DMADirection dir, MemTxAttrs attrs) -{ - dma_barrier(as, dir); - - return dma_memory_rw_relaxed(as, addr, buf, len, dir, attrs); -} - -/** - * dma_memory_read: Read from an address space from DMA controller. - * - * Return a MemTxResult indicating whether the operation succeeded - * or failed (eg unassigned memory, device rejected the transaction, - * IOMMU fault). Called within RCU critical section. - * - * @as: #AddressSpace to be accessed - * @addr: address within that address space - * @buf: buffer with the data transferred - * @len: length of the data transferred - * @attrs: memory transaction attributes - */ -static inline MemTxResult dma_memory_read(AddressSpace *as, dma_addr_t addr, - void *buf, dma_addr_t len, - MemTxAttrs attrs) -{ - return dma_memory_rw(as, addr, buf, len, - DMA_DIRECTION_TO_DEVICE, attrs); -} - -/** - * address_space_write: Write to address space from DMA controller. - * - * Return a MemTxResult indicating whether the operation succeeded - * or failed (eg unassigned memory, device rejected the transaction, - * IOMMU fault). - * - * @as: #AddressSpace to be accessed - * @addr: address within that address space - * @buf: buffer with the data transferred - * @len: the number of bytes to write - * @attrs: memory transaction attributes - */ -static inline MemTxResult dma_memory_write(AddressSpace *as, dma_addr_t addr, - const void *buf, dma_addr_t len, - MemTxAttrs attrs) -{ - return dma_memory_rw(as, addr, (void *)buf, len, - DMA_DIRECTION_FROM_DEVICE, attrs); -} - -/** - * dma_memory_set: Fill memory with a constant byte from DMA controller. - * - * Return a MemTxResult indicating whether the operation succeeded - * or failed (eg unassigned memory, device rejected the transaction, - * IOMMU fault). - * - * @as: #AddressSpace to be accessed - * @addr: address within that address space - * @c: constant byte to fill the memory - * @len: the number of bytes to fill with the constant byte - * @attrs: memory transaction attributes - */ -MemTxResult dma_memory_set(AddressSpace *as, dma_addr_t addr, - uint8_t c, dma_addr_t len, MemTxAttrs attrs); - -/** - * address_space_map: Map a physical memory region into a host virtual address. - * - * May map a subset of the requested range, given by and returned in @plen. - * May return %NULL and set *@plen to zero(0), if resources needed to perform - * the mapping are exhausted. - * Use only for reads OR writes - not for read-modify-write operations. - * - * @as: #AddressSpace to be accessed - * @addr: address within that address space - * @len: pointer to length of buffer; updated on return - * @dir: indicates the transfer direction - * @attrs: memory attributes - */ -static inline void *dma_memory_map(AddressSpace *as, - dma_addr_t addr, dma_addr_t *len, - DMADirection dir, MemTxAttrs attrs) -{ - hwaddr xlen = *len; - void *p; - - p = address_space_map(as, addr, &xlen, dir == DMA_DIRECTION_FROM_DEVICE, - attrs); - *len = xlen; - return p; -} - -/** - * address_space_unmap: Unmaps a memory region previously mapped - * by dma_memory_map() - * - * Will also mark the memory as dirty if @dir == %DMA_DIRECTION_FROM_DEVICE. - * @access_len gives the amount of memory that was actually read or written - * by the caller. - * - * @as: #AddressSpace used - * @buffer: host pointer as returned by address_space_map() - * @len: buffer length as returned by address_space_map() - * @dir: indicates the transfer direction - * @access_len: amount of data actually transferred - */ -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 MemTxResult ld##_lname##_##_end##_dma(AddressSpace *as, \ - dma_addr_t addr, \ - uint##_bits##_t *pval, \ - MemTxAttrs attrs) \ - { \ - MemTxResult res = dma_memory_read(as, addr, pval, (_bits) / 8, attrs); \ - _end##_bits##_to_cpus(pval); \ - return res; \ - } \ - static inline MemTxResult st##_sname##_##_end##_dma(AddressSpace *as, \ - dma_addr_t addr, \ - uint##_bits##_t val, \ - MemTxAttrs attrs) \ - { \ - val = cpu_to_##_end##_bits(val); \ - return dma_memory_write(as, addr, &val, (_bits) / 8, attrs); \ - } - -static inline MemTxResult ldub_dma(AddressSpace *as, dma_addr_t addr, - uint8_t *val, MemTxAttrs attrs) -{ - return dma_memory_read(as, addr, val, 1, attrs); -} - -static inline MemTxResult stb_dma(AddressSpace *as, dma_addr_t addr, - uint8_t val, MemTxAttrs attrs) -{ - return dma_memory_write(as, addr, &val, 1, attrs); -} - -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); - -typedef BlockAIOCB *DMAIOFunc(int64_t offset, QEMUIOVector *iov, - BlockCompletionFunc *cb, void *cb_opaque, - void *opaque); - -BlockAIOCB *dma_blk_io(AioContext *ctx, - QEMUSGList *sg, uint64_t offset, uint32_t align, - DMAIOFunc *io_func, void *io_func_opaque, - BlockCompletionFunc *cb, void *opaque, DMADirection dir); -BlockAIOCB *dma_blk_read(BlockBackend *blk, - QEMUSGList *sg, uint64_t offset, uint32_t align, - BlockCompletionFunc *cb, void *opaque); -BlockAIOCB *dma_blk_write(BlockBackend *blk, - QEMUSGList *sg, uint64_t offset, uint32_t align, - BlockCompletionFunc *cb, void *opaque); -MemTxResult dma_buf_read(void *ptr, dma_addr_t len, dma_addr_t *residual, - QEMUSGList *sg, MemTxAttrs attrs); -MemTxResult dma_buf_write(void *ptr, dma_addr_t len, dma_addr_t *residual, - QEMUSGList *sg, MemTxAttrs attrs); - -void dma_acct_start(BlockBackend *blk, BlockAcctCookie *cookie, - QEMUSGList *sg, enum BlockAcctType type); - -/** - * dma_aligned_pow2_mask: Return the address bit mask of the largest - * power of 2 size less or equal than @end - @start + 1, aligned with @start, - * and bounded by 1 << @max_addr_bits bits. - * - * @start: range start address - * @end: range end address (greater than @start) - * @max_addr_bits: max address bits (<= 64) - */ -uint64_t dma_aligned_pow2_mask(uint64_t start, uint64_t end, - int max_addr_bits); - -#endif |