Philippe Mathieu-Daudé <phi...@redhat.com> 于2020年9月4日周五 下午11:47写道: > > address_space_write() returns a MemTxResult type. > Do not discard it, return it to the caller. > > Signed-off-by: Philippe Mathieu-Daudé <phi...@redhat.com>
Reviewed-by: Li Qiang <liq...@gmail.com> > --- > include/sysemu/dma.h | 15 ++++++++++++++- > dma-helpers.c | 7 ++++--- > 2 files changed, 18 insertions(+), 4 deletions(-) > > diff --git a/include/sysemu/dma.h b/include/sysemu/dma.h > index 19bc9ad1b69..ad8a3f82f47 100644 > --- a/include/sysemu/dma.h > +++ b/include/sysemu/dma.h > @@ -123,7 +123,20 @@ static inline int dma_memory_write(AddressSpace *as, > dma_addr_t addr, > 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 DMA controller > diff --git a/dma-helpers.c b/dma-helpers.c > index 41ef24a63b6..4a9e37d6d06 100644 > --- a/dma-helpers.c > +++ b/dma-helpers.c > @@ -1,7 +1,7 @@ > /* > * 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. > @@ -18,14 +18,15 @@ > > /* #define DEBUG_IOMMU */ > > -int dma_memory_set(AddressSpace *as, dma_addr_t addr, uint8_t c, dma_addr_t > len) > +MemTxResult dma_memory_set(AddressSpace *as, dma_addr_t addr, > + uint8_t c, dma_addr_t len) > { > dma_barrier(as, DMA_DIRECTION_FROM_DEVICE); > > #define FILLBUF_SIZE 512 > uint8_t fillbuf[FILLBUF_SIZE]; > int l; > - bool error = false; > + MemTxResult error = MEMTX_OK; > > memset(fillbuf, c, FILLBUF_SIZE); > while (len > 0) { > -- > 2.26.2 > >