[Qemu-devel] [PATCH 04/11] ide: add DMA hooks to bus ops

[Alexander Graf <agraf@suse.de>]

For DMA operations, we need to hook into even more IDE functionality.

This patch adds the respective hooking points, allowing us to handle
SG lists ourselves in the AHCI code.

Signed-off-by: Roland Elek <elek.roland@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

---

v1 -> v2:

  - make dma hooks explicit by putting them into ops struct (stefanha)
---
 hw/ide/core.c     |    9 ++++++---
 hw/ide/internal.h |    4 ++++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/hw/ide/core.c b/hw/ide/core.c
index c8d7810..04190d2 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -607,7 +607,7 @@ static void ide_read_dma_cb(void *opaque, int ret)
     n = s->nsector;
     s->io_buffer_index = 0;
     s->io_buffer_size = n * 512;
-    if (dma_buf_prepare(bm, 1) == 0)
+    if (s->bus->ops->dma_prepare_fn(bm, 1) == 0)
         goto eot;
 #ifdef DEBUG_AIO
     printf("aio_read: sector_num=%" PRId64 " n=%d\n", sector_num, n);
@@ -752,7 +752,7 @@ static void ide_write_dma_cb(void *opaque, int ret)
     n = s->nsector;
     s->io_buffer_size = n * 512;
     /* launch next transfer */
-    if (dma_buf_prepare(bm, 0) == 0)
+    if (s->bus->ops->dma_prepare_fn(bm, 0) == 0)
         goto eot;
 #ifdef DEBUG_AIO
     printf("aio_write: sector_num=%" PRId64 " n=%d\n", sector_num, n);
@@ -1060,7 +1060,7 @@ static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret)
 	    s->lba += n;
 	}
         s->packet_transfer_size -= s->io_buffer_size;
-        if (dma_buf_rw(bm, 1) == 0)
+        if (s->bus->ops->dma_rw_fn(bm, 1) == 0)
             goto eot;
     }
 
@@ -2715,6 +2715,7 @@ int ide_init_drive(IDEState *s, BlockDriverState *bs,
     } else {
         pstrcpy(s->version, sizeof(s->version), QEMU_VERSION);
     }
+
     ide_reset(s);
     bdrv_set_removable(bs, s->drive_kind == IDE_CD);
     return 0;
@@ -2740,6 +2741,8 @@ static IDEBusOps ide_bus_ops = {
     .transfer_start_fn = pata_transfer_start,
     .irq_set_fn = pata_set_irq,
     .dma_start_fn = pata_dma_start,
+    .dma_prepare_fn = dma_buf_prepare,
+    .dma_rw_fn = dma_buf_rw,
 };
 
 void ide_init2(IDEBus *bus, qemu_irq irq)
diff --git a/hw/ide/internal.h b/hw/ide/internal.h
index ee7e13e..4bee636 100644
--- a/hw/ide/internal.h
+++ b/hw/ide/internal.h
@@ -374,6 +374,8 @@ typedef void TransferStartFunc(IDEState *,
                              EndTransferFunc *);
 typedef void IRQSetFunc(IDEBus *);
 typedef void DMAStartFunc(IDEState *, BlockDriverCompletionFunc *);
+typedef int DMAPrepareFunc(BMDMAState *, int);
+typedef int DMARWFunc(BMDMAState *, int);
 
 /* NOTE: IDEState represents in fact one drive */
 struct IDEState {
@@ -457,6 +459,8 @@ struct IDEBusOps {
     TransferStartFunc *transfer_start_fn;
     IRQSetFunc *irq_set_fn;
     DMAStartFunc *dma_start_fn;
+    DMAPrepareFunc *dma_prepare_fn;
+    DMARWFunc *dma_rw_fn;
 };
 
 struct IDEBus {
-- 
1.6.0.2