/*
* DMA helper functions
*
- * Copyright (c) 2009 Red Hat
+ * 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.
#include "exec/memory.h"
#include "exec/address-spaces.h"
-#include "hw/hw.h"
#include "block/block.h"
#include "block/accounting.h"
DMADirection dir)
{
return address_space_access_valid(as, addr, len,
- dir == DMA_DIRECTION_FROM_DEVICE);
+ dir == DMA_DIRECTION_FROM_DEVICE,
+ MEMTXATTRS_UNSPECIFIED);
}
-static inline int dma_memory_rw_relaxed(AddressSpace *as, dma_addr_t addr,
- void *buf, dma_addr_t len,
- DMADirection dir)
+static inline MemTxResult 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);
+ return 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)
+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);
}
-static inline int dma_memory_write_relaxed(AddressSpace *as, dma_addr_t addr,
- const void *buf, dma_addr_t len)
+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);
}
-static inline int dma_memory_rw(AddressSpace *as, dma_addr_t addr,
- void *buf, dma_addr_t len,
- DMADirection dir)
+/**
+ * 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
+ */
+static inline MemTxResult 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)
+/**
+ * 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
+ */
+static inline MemTxResult 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)
+/**
+ * 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
+ */
+static inline MemTxResult 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);
+/**
+ * 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
+ */
+MemTxResult dma_memory_set(AddressSpace *as, dma_addr_t addr,
+ uint8_t c, dma_addr_t len);
+/**
+ * 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
+ */
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);
+ p = address_space_map(as, addr, &xlen, dir == DMA_DIRECTION_FROM_DEVICE,
+ MEMTXATTRS_UNSPECIFIED);
*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)
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
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