ide: replace set_unit callback with more IDEBus state

Start moving the initial state of the current request to IDEBus, so that
AHCI can use it.  The set_unit callback is not used anymore once this is
done.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Message-id: 1424708286-16483-9-git-send-email-jsnow@redhat.com
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

hw/ide/ahci.c

@@ -1226,12 +1226,6 @@ static int ahci_dma_rw_buf(IDEDMA *dma, int is_write)
     return 1;
 }
 
-static int ahci_dma_set_unit(IDEDMA *dma, int unit)
-{
-    /* only a single unit per link */
-    return 0;
-}
-
 static void ahci_cmd_done(IDEDMA *dma)
 {
     AHCIDevice *ad = DO_UPCAST(AHCIDevice, dma, dma);
@@ -1258,7 +1252,6 @@ static const IDEDMAOps ahci_dma_ops = {
     .prepare_buf = ahci_dma_prepare_buf,
     .commit_buf = ahci_commit_buf,
     .rw_buf = ahci_dma_rw_buf,
-    .set_unit = ahci_dma_set_unit,
     .cmd_done = ahci_cmd_done,
 };
 

hw/ide/core.c

@@ -646,6 +646,7 @@ static void dma_buf_commit(IDEState *s, uint32_t tx_bytes)
 void ide_set_inactive(IDEState *s, bool more)
 {
     s->bus->dma->aiocb = NULL;
+    s->bus->retry_unit = -1;
     if (s->bus->dma->ops->set_inactive) {
         s->bus->dma->ops->set_inactive(s->bus->dma, more);
     }
@@ -666,7 +667,7 @@ static int ide_handle_rw_error(IDEState *s, int error, int op)
     BlockErrorAction action = blk_get_error_action(s->blk, is_read, error);
 
     if (action == BLOCK_ERROR_ACTION_STOP) {
-        s->bus->dma->ops->set_unit(s->bus->dma, s->unit);
+        assert(s->bus->retry_unit == s->unit);
         s->bus->error_status = op;
     } else if (action == BLOCK_ERROR_ACTION_REPORT) {
         if (op & IDE_RETRY_DMA) {
@@ -799,6 +800,7 @@ static void ide_sector_start_dma(IDEState *s, enum ide_dma_cmd dma_cmd)
 
 void ide_start_dma(IDEState *s, BlockCompletionFunc *cb)
 {
+    s->bus->retry_unit = s->unit;
     if (s->bus->dma->ops->start_dma) {
         s->bus->dma->ops->start_dma(s->bus->dma, s, cb);
     }
@@ -2327,11 +2329,11 @@ static const IDEDMAOps ide_dma_nop_ops = {
     .prepare_buf    = ide_nop_int32,
     .restart_dma    = ide_nop,
     .rw_buf         = ide_nop_int,
-    .set_unit       = ide_nop_int,
 };
 
 static void ide_restart_dma(IDEState *s, enum ide_dma_cmd dma_cmd)
 {
+    s->unit = s->bus->retry_unit;
     s->bus->dma->ops->restart_dma(s->bus->dma);
     s->io_buffer_index = 0;
     s->io_buffer_size = 0;

hw/ide/internal.h

@@ -436,7 +436,6 @@ struct IDEDMAOps {
     DMAInt32Func *prepare_buf;
     DMAu32Func *commit_buf;
     DMAIntFunc *rw_buf;
-    DMAIntFunc *set_unit;
     DMAVoidFunc *restart_dma;
     DMAStopFunc *set_inactive;
     DMAVoidFunc *cmd_done;
@@ -465,6 +464,7 @@ struct IDEBus {
     qemu_irq irq;
 
     int error_status;
+    uint8_t retry_unit;
 };
 
 #define TYPE_IDE_DEVICE "ide-device"

hw/ide/macio.c

@@ -572,7 +572,6 @@ static const IDEDMAOps dbdma_ops = {
     .start_dma      = ide_dbdma_start,
     .prepare_buf    = ide_nop_int32,
     .rw_buf         = ide_nop_int,
-    .set_unit       = ide_nop_int,
 };
 
 static void macio_ide_realizefn(DeviceState *dev, Error **errp)

hw/ide/pci.c

@@ -42,7 +42,6 @@ static void bmdma_start_dma(IDEDMA *dma, IDEState *s,
 {
     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 
-    bm->unit = s->unit;
     bm->dma_cb = dma_cb;
     bm->cur_prd_last = 0;
     bm->cur_prd_addr = 0;
@@ -163,20 +162,11 @@ static int bmdma_rw_buf(IDEDMA *dma, int is_write)
     return 1;
 }
 
-static int bmdma_set_unit(IDEDMA *dma, int unit)
-{
-    BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
-    bm->unit = unit;
-
-    return 0;
-}
-
 static void bmdma_set_inactive(IDEDMA *dma, bool more)
 {
     BMDMAState *bm = DO_UPCAST(BMDMAState, dma, dma);
 
     bm->dma_cb = NULL;
-    bm->unit = -1;
     if (more) {
         bm->status |= BM_STATUS_DMAING;
     } else {
@@ -335,6 +325,7 @@ static void ide_bmdma_pre_save(void *opaque)
     BMDMAState *bm = opaque;
     uint8_t abused_bits = BM_MIGRATION_COMPAT_STATUS_BITS;
 
+    bm->migration_retry_unit = bm->bus->retry_unit;
     bm->migration_compat_status =
         (bm->status & ~abused_bits) | (bm->bus->error_status & abused_bits);
 }
@@ -351,6 +342,9 @@ static int ide_bmdma_post_load(void *opaque, int version_id)
         bm->status = bm->migration_compat_status & ~abused_bits;
         bm->bus->error_status |= bm->migration_compat_status & abused_bits;
     }
+    if (bm->bus->error_status) {
+        bm->bus->retry_unit = bm->migration_retry_unit;
+    }
 
     return 0;
 }
@@ -389,7 +383,7 @@ static const VMStateDescription vmstate_bmdma = {
         VMSTATE_UINT32(addr, BMDMAState),
         VMSTATE_INT64(sector_num, BMDMAState),
         VMSTATE_UINT32(nsector, BMDMAState),
-        VMSTATE_UINT8(unit, BMDMAState),
+        VMSTATE_UINT8(migration_retry_unit, BMDMAState),
         VMSTATE_END_OF_LIST()
     },
     .subsections = (VMStateSubsection []) {
@@ -413,7 +407,7 @@ static int ide_pci_post_load(void *opaque, int version_id)
     for(i = 0; i < 2; i++) {
         /* current versions always store 0/1, but older version
            stored bigger values. We only need last bit */
-        d->bmdma[i].unit &= 1;
+        d->bmdma[i].migration_retry_unit &= 1;
         ide_bmdma_post_load(&d->bmdma[i], -1);
     }
 
@@ -454,7 +448,6 @@ static const struct IDEDMAOps bmdma_ops = {
     .start_dma = bmdma_start_dma,
     .prepare_buf = bmdma_prepare_buf,
     .rw_buf = bmdma_rw_buf,
-    .set_unit = bmdma_set_unit,
     .restart_dma = bmdma_restart_dma,
     .set_inactive = bmdma_set_inactive,
     .reset = bmdma_reset,

hw/ide/pci.h

@@ -33,6 +33,8 @@ typedef struct BMDMAState {
     /* Bit 0-2 and 7:   BM status register
      * Bit 3-6:         bus->error_status */
     uint8_t migration_compat_status;
+    uint8_t migration_retry_unit;
+
     struct PCIIDEState *pci_dev;
 } BMDMAState;
 
@@ -61,8 +63,8 @@ typedef struct PCIIDEState {
 
 static inline IDEState *bmdma_active_if(BMDMAState *bmdma)
 {
-    assert(bmdma->unit != (uint8_t)-1);
-    return bmdma->bus->ifs + bmdma->unit;
+    assert(bmdma->bus->retry_unit != (uint8_t)-1);
+    return bmdma->bus->ifs + bmdma->bus->retry_unit;
 }