From cae323572eddc1a45e2f6ef98c006d98fed23b1e Mon Sep 17 00:00:00 2001 From: Alexander Graf Date: Sun, 30 Jun 2013 02:54:35 +0200 Subject: PPC: dbdma: Wait for DMA until we have data We should only start processing DMA requests when we have data to process. Hold off working through the DMA shuffling until the IDE core told us that it's ready. This is required because the guest can program the DMA engine or the IDE transfer first. Both are legal. Signed-off-by: Alexander Graf --- hw/ide/macio.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'hw/ide') diff --git a/hw/ide/macio.c b/hw/ide/macio.c index 126549dcdc..2b1e51d49e 100644 --- a/hw/ide/macio.c +++ b/hw/ide/macio.c @@ -64,6 +64,14 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret) goto done; } + if (!m->dma_active) { + MACIO_DPRINTF("waiting for data (%#x - %#x - %x)\n", + s->nsector, io->len, s->status); + /* data not ready yet, wait for the channel to get restarted */ + io->processing = false; + return; + } + MACIO_DPRINTF("io_buffer_size = %#x\n", s->io_buffer_size); if (s->io_buffer_size > 0) { @@ -80,6 +88,7 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret) if (s->packet_transfer_size <= 0) { MACIO_DPRINTF("end of transfer\n"); ide_atapi_cmd_ok(s); + m->dma_active = false; } if (io->len == 0) { @@ -130,6 +139,14 @@ static void pmac_ide_transfer_cb(void *opaque, int ret) goto done; } + if (!m->dma_active) { + MACIO_DPRINTF("waiting for data (%#x - %#x - %x)\n", + s->nsector, io->len, s->status); + /* data not ready yet, wait for the channel to get restarted */ + io->processing = false; + return; + } + sector_num = ide_get_sector(s); MACIO_DPRINTF("io_buffer_size = %#x\n", s->io_buffer_size); if (s->io_buffer_size > 0) { @@ -145,6 +162,7 @@ static void pmac_ide_transfer_cb(void *opaque, int ret) MACIO_DPRINTF("end of transfer\n"); s->status = READY_STAT | SEEK_STAT; ide_set_irq(s->bus); + m->dma_active = false; } if (io->len == 0) { @@ -379,6 +397,7 @@ static void ide_dbdma_start(IDEDMA *dma, IDEState *s, MACIOIDEState *m = container_of(dma, MACIOIDEState, dma); MACIO_DPRINTF("\n"); + m->dma_active = true; DBDMA_kick(m->dbdma); } -- cgit v1.2.1