Re: [Qemu-devel] [PATCH 03/66] dma: keep a device alive while it has SGLists

[Paolo Bonzini <pbonzini@redhat.com>]

Il 04/07/2013 17:51, Jan Kiszka ha scritto:
>> > diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
>> > index 16d6356..65e6680 100644
>> > --- a/hw/usb/hcd-ehci.c
>> > +++ b/hw/usb/hcd-ehci.c
>> > @@ -1245,7 +1245,7 @@ static int ehci_init_transfer(EHCIPacket *p)
>> >      cpage  = get_field(p->qtd.token, QTD_TOKEN_CPAGE);
>> >      bytes  = get_field(p->qtd.token, QTD_TOKEN_TBYTES);
>> >      offset = p->qtd.bufptr[0] & ~QTD_BUFPTR_MASK;
>> > -    qemu_sglist_init(&p->sgl, 5, p->queue->ehci->as);
>> > +    qemu_sglist_init(&p->sgl, DEVICE(p->queue->ehci), 5, p->queue->ehci->as);
> I was just testing this from your current git tree, and it causes
> 
> qemu/hw/usb/hcd-ehci.c:1248:ehci_init_transfer: Object 0x7f3eb39c6500 is
> not an instance of type device
> 
> when booting a q35 machine (as it pulls in EHCI). The cast is obviously
> wrong, but I didn't spot yet what is required instead.

EHCIState and AHCIDevice are not qdev structs.  You need to go
through the bus to get the DeviceState.  But I had fixed this once...

/me checks

Yes, I had fixed it at the same time I fixed Andreas's requested 
BUS().  I thought I had fixed it _before_ posting this patch first.

Pulling in the "Reviewed-by"s (as I just replied to the cover 
letter) also pulled in the right version of the patch.  So it
should be fixed _now_ in git (commit c7086b4a).

I tested both AHCI and EHCI and they work.

(BTW, Andreas, I'll do a SCSI_BUS pass over hw/scsi when I
have some time).

Paolo

git diff mirror/iommu-for-anthony@{1} iommu-for-anthony
diff --git a/hw/ide/ahci.c b/hw/ide/ahci.c
index bae484a..97eddec 100644
--- a/hw/ide/ahci.c
+++ b/hw/ide/ahci.c
@@ -650,6 +650,8 @@ static int ahci_populate_sglist(AHCIDevice *ad, QEMUSGList *sglist, int offset)
     int off_idx = -1;
     int off_pos = -1;
     int tbl_entry_size;
+    IDEBus *bus = &ad->port;
+    BusState *qbus = BUS(bus);
 
     if (!sglist_alloc_hint) {
         DPRINTF(ad->port_no, "no sg list given by guest: 0x%08x\n", opts);
@@ -691,7 +693,7 @@ static int ahci_populate_sglist(AHCIDevice *ad, QEMUSGList *sglist, int offset)
             goto out;
         }
 
-        qemu_sglist_init(sglist, DEVICE(ad->hba), (sglist_alloc_hint - off_idx),
+        qemu_sglist_init(sglist, qbus->parent, (sglist_alloc_hint - off_idx),
                          ad->hba->as);
         qemu_sglist_add(sglist, le64_to_cpu(tbl[off_idx].addr + off_pos),
                         le32_to_cpu(tbl[off_idx].flags_size) + 1 - off_pos);
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index cdc932b..67e4b24 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -1241,11 +1241,13 @@ static int ehci_init_transfer(EHCIPacket *p)
 {
     uint32_t cpage, offset, bytes, plen;
     dma_addr_t page;
+    USBBus *bus = &p->queue->ehci->bus;
+    BusState *qbus = BUS(bus);
 
     cpage  = get_field(p->qtd.token, QTD_TOKEN_CPAGE);
     bytes  = get_field(p->qtd.token, QTD_TOKEN_TBYTES);
     offset = p->qtd.bufptr[0] & ~QTD_BUFPTR_MASK;
-    qemu_sglist_init(&p->sgl, DEVICE(p->queue->ehci), 5, p->queue->ehci->as);
+    qemu_sglist_init(&p->sgl, qbus->parent, 5, p->queue->ehci->as);
 
     while (bytes > 0) {
         if (cpage > 4) {