diff options
Diffstat (limited to 'hw/ide')
| -rw-r--r-- | hw/ide/core.c | 45 | ||||
| -rw-r--r-- | hw/ide/internal.h | 1 | ||||
| -rw-r--r-- | hw/ide/pci.c | 36 |
3 files changed, 47 insertions, 35 deletions
diff --git a/hw/ide/core.c b/hw/ide/core.c index 37d1058410..5cafcf5287 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -609,6 +609,51 @@ BlockAIOCB *ide_buffered_readv(IDEState *s, int64_t sector_num, return aioreq; } +/** + * Cancel all pending DMA requests. + * Any buffered DMA requests are instantly canceled, + * but any pending unbuffered DMA requests must be waited on. + */ +void ide_cancel_dma_sync(IDEState *s) +{ + IDEBufferedRequest *req; + + /* First invoke the callbacks of all buffered requests + * and flag those requests as orphaned. Ideally there + * are no unbuffered (Scatter Gather DMA Requests or + * write requests) pending and we can avoid to drain. */ + QLIST_FOREACH(req, &s->buffered_requests, list) { + if (!req->orphaned) { +#ifdef DEBUG_IDE + printf("%s: invoking cb %p of buffered request %p with" + " -ECANCELED\n", __func__, req->original_cb, req); +#endif + req->original_cb(req->original_opaque, -ECANCELED); + } + req->orphaned = true; + } + + /* + * We can't cancel Scatter Gather DMA in the middle of the + * operation or a partial (not full) DMA transfer would reach + * the storage so we wait for completion instead (we beahve + * like if the DMA was completed by the time the guest trying + * to cancel dma with bmdma_cmd_writeb with BM_CMD_START not + * set). + * + * In the future we'll be able to safely cancel the I/O if the + * whole DMA operation will be submitted to disk with a single + * aio operation with preadv/pwritev. + */ + if (s->bus->dma->aiocb) { +#ifdef DEBUG_IDE + printf("%s: draining all remaining requests", __func__); +#endif + blk_drain_all(); + assert(s->bus->dma->aiocb == NULL); + } +} + static void ide_sector_read(IDEState *s); static void ide_sector_read_cb(void *opaque, int ret) diff --git a/hw/ide/internal.h b/hw/ide/internal.h index 2d1e2d2d2f..86bde26551 100644 --- a/hw/ide/internal.h +++ b/hw/ide/internal.h @@ -586,6 +586,7 @@ BlockAIOCB *ide_issue_trim(BlockBackend *blk, BlockAIOCB *ide_buffered_readv(IDEState *s, int64_t sector_num, QEMUIOVector *iov, int nb_sectors, BlockCompletionFunc *cb, void *opaque); +void ide_cancel_dma_sync(IDEState *s); /* hw/ide/atapi.c */ void ide_atapi_cmd(IDEState *s); diff --git a/hw/ide/pci.c b/hw/ide/pci.c index fa5b63bc3f..92ffee7264 100644 --- a/hw/ide/pci.c +++ b/hw/ide/pci.c @@ -234,41 +234,7 @@ void bmdma_cmd_writeb(BMDMAState *bm, uint32_t val) /* Ignore writes to SSBM if it keeps the old value */ if ((val & BM_CMD_START) != (bm->cmd & BM_CMD_START)) { if (!(val & BM_CMD_START)) { - /* First invoke the callbacks of all buffered requests - * and flag those requests as orphaned. Ideally there - * are no unbuffered (Scatter Gather DMA Requests or - * write requests) pending and we can avoid to drain. */ - IDEBufferedRequest *req; - IDEState *s = idebus_active_if(bm->bus); - QLIST_FOREACH(req, &s->buffered_requests, list) { - if (!req->orphaned) { -#ifdef DEBUG_IDE - printf("%s: invoking cb %p of buffered request %p with" - " -ECANCELED\n", __func__, req->original_cb, req); -#endif - req->original_cb(req->original_opaque, -ECANCELED); - } - req->orphaned = true; - } - /* - * We can't cancel Scatter Gather DMA in the middle of the - * operation or a partial (not full) DMA transfer would reach - * the storage so we wait for completion instead (we beahve - * like if the DMA was completed by the time the guest trying - * to cancel dma with bmdma_cmd_writeb with BM_CMD_START not - * set). - * - * In the future we'll be able to safely cancel the I/O if the - * whole DMA operation will be submitted to disk with a single - * aio operation with preadv/pwritev. - */ - if (bm->bus->dma->aiocb) { -#ifdef DEBUG_IDE - printf("%s: draining all remaining requests", __func__); -#endif - blk_drain_all(); - assert(bm->bus->dma->aiocb == NULL); - } + ide_cancel_dma_sync(idebus_active_if(bm->bus)); bm->status &= ~BM_STATUS_DMAING; } else { bm->cur_addr = bm->addr; |