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exec/memory: Extract address_space_set() from dma_memory_set() 

dma_memory_set() does a DMA barrier, set the address space with
a constant value. The constant value filling code is not specific
to DMA and can be used for AddressSpace. Extract it as a new
helper: address_space_set().

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
[lv: rebase]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <20220115203725.3834712-2-laurent@vivier.eu>
This commit is contained in:
Philippe Mathieu-Daudé 2022-01-15 21:37:23 +01:00 committed by Laurent Vivier
parent 5e0214cdee
commit 75f01c68b5
3 changed files with 36 additions and 14 deletions
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16
include/exec/memory.h
View File

@ -2908,6 +2908,22 @@ address_space_write_cached(MemoryRegionCache *cache, hwaddr addr,
}
}
/**
* address_space_set: Fill address space with a constant byte.
*
* 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 address_space_set(AddressSpace *as, hwaddr addr,
uint8_t c, hwaddr len, MemTxAttrs attrs);
#ifdef NEED_CPU_H
/* enum device_endian to MemOp. */
static inline MemOp devend_memop(enum device_endian end)

15
softmmu/dma-helpers.c
View File

@ -23,20 +23,7 @@ MemTxResult dma_memory_set(AddressSpace *as, dma_addr_t addr,
{
dma_barrier(as, DMA_DIRECTION_FROM_DEVICE);
#define FILLBUF_SIZE 512
uint8_t fillbuf[FILLBUF_SIZE];
int l;
MemTxResult error = MEMTX_OK;
memset(fillbuf, c, FILLBUF_SIZE);
while (len > 0) {
l = len < FILLBUF_SIZE ? len : FILLBUF_SIZE;
error |= address_space_write(as, addr, attrs, fillbuf, l);
len -= l;
addr += l;
}
return error;
return address_space_set(as, addr, c, len, attrs);
}
void qemu_sglist_init(QEMUSGList *qsg, DeviceState *dev, int alloc_hint,

19
softmmu/physmem.c
View File

@ -2927,6 +2927,25 @@ MemTxResult address_space_rw(AddressSpace *as, hwaddr addr, MemTxAttrs attrs,
}
}
MemTxResult address_space_set(AddressSpace *as, hwaddr addr,
uint8_t c, hwaddr len, MemTxAttrs attrs)
{
#define FILLBUF_SIZE 512
uint8_t fillbuf[FILLBUF_SIZE];
int l;
MemTxResult error = MEMTX_OK;
memset(fillbuf, c, FILLBUF_SIZE);
while (len > 0) {
l = len < FILLBUF_SIZE ? len : FILLBUF_SIZE;
error |= address_space_write(as, addr, attrs, fillbuf, l);
len -= l;
addr += l;
}
return error;
}
void cpu_physical_memory_rw(hwaddr addr, void *buf,
hwaddr len, bool is_write)
{