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ehci: add queuing support 

Add packet queuing.  Follow the qTD chain to see if there are more
packets we can submit.  Improves performance on larger transfers,
especially with usb-host, as we don't have to wait for a packet to
finish before sending the next one to the host for processing.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Gerd Hoffmann 2012-05-10 14:12:38 +02:00
parent cd6657156e
commit 773dc9cdfd
1 changed files with 51 additions and 9 deletions
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60
hw/usb/hcd-ehci.c
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@ -671,10 +671,6 @@ static EHCIPacket *ehci_alloc_packet(EHCIQueue *q)
{
EHCIPacket *p;
#if 1
/* temporary, we don't handle multiple packets per queue (yet) */
assert(QTAILQ_EMPTY(&q->packets));
#endif
p = g_new0(EHCIPacket, 1);
p->queue = q;
usb_packet_init(&p->packet);
@ -1394,7 +1390,7 @@ static void ehci_execute_complete(EHCIQueue *q)
// 4.10.3
static int ehci_execute(EHCIPacket *p)
static int ehci_execute(EHCIPacket *p, const char *action)
{
USBEndpoint *ep;
int ret;
@ -1437,6 +1433,7 @@ static int ehci_execute(EHCIPacket *p)
usb_packet_setup(&p->packet, p->pid, ep);
usb_packet_map(&p->packet, &p->sgl);
trace_usb_ehci_packet_action(p->queue, p, action);
ret = usb_handle_packet(p->queue->dev, &p->packet);
DPRINTF("submit: qh %x next %x qtd %x pid %x len %zd "
"(total %d) endp %x ret %d\n",
@ -1713,7 +1710,7 @@ static EHCIQueue *ehci_state_fetchqh(EHCIState *ehci, int async)
}
if (p && p->async == EHCI_ASYNC_FINISHED) {
/* I/O finished -- continue processing queue */
trace_usb_ehci_queue_action(q, "resume");
trace_usb_ehci_packet_action(p->queue, p, "complete");
ehci_set_state(ehci, async, EST_EXECUTING);
goto out;
}
@ -1858,7 +1855,22 @@ static int ehci_state_fetchqtd(EHCIQueue *q, int async)
sizeof(EHCIqtd) >> 2);
ehci_trace_qtd(q, NLPTR_GET(q->qtdaddr), &qtd);
if (qtd.token & QTD_TOKEN_ACTIVE) {
p = QTAILQ_FIRST(&q->packets);
while (p != NULL && p->qtdaddr != q->qtdaddr) {
/* should not happen (guest bug) */
ehci_free_packet(p);
p = QTAILQ_FIRST(&q->packets);
}
if (p != NULL) {
ehci_qh_do_overlay(q);
ehci_flush_qh(q);
if (p->async == EHCI_ASYNC_INFLIGHT) {
ehci_set_state(q->ehci, async, EST_HORIZONTALQH);
} else {
ehci_set_state(q->ehci, async, EST_EXECUTING);
}
again = 1;
} else if (qtd.token & QTD_TOKEN_ACTIVE) {
p = ehci_alloc_packet(q);
p->qtdaddr = q->qtdaddr;
p->qtd = qtd;
@ -1887,6 +1899,35 @@ static int ehci_state_horizqh(EHCIQueue *q, int async)
return again;
}
static void ehci_fill_queue(EHCIPacket *p, int async)
{
EHCIQueue *q = p->queue;
EHCIqtd qtd = p->qtd;
uint32_t qtdaddr;
for (;;) {
if (NLPTR_TBIT(qtd.altnext) == 0) {
break;
}
if (NLPTR_TBIT(qtd.next) != 0) {
break;
}
qtdaddr = qtd.next;
get_dwords(q->ehci, NLPTR_GET(qtdaddr),
(uint32_t *) &qtd, sizeof(EHCIqtd) >> 2);
ehci_trace_qtd(q, NLPTR_GET(qtdaddr), &qtd);
if (!(qtd.token & QTD_TOKEN_ACTIVE)) {
break;
}
p = ehci_alloc_packet(q);
p->qtdaddr = qtdaddr;
p->qtd = qtd;
p->usb_status = ehci_execute(p, "queue");
assert(p->usb_status = USB_RET_ASYNC);
p->async = EHCI_ASYNC_INFLIGHT;
}
}
static int ehci_state_execute(EHCIQueue *q, int async)
{
EHCIPacket *p = QTAILQ_FIRST(&q->packets);
@ -1916,17 +1957,18 @@ static int ehci_state_execute(EHCIQueue *q, int async)
ehci_set_usbsts(q->ehci, USBSTS_REC);
}
p->usb_status = ehci_execute(p);
p->usb_status = ehci_execute(p, "process");
if (p->usb_status == USB_RET_PROCERR) {
again = -1;
goto out;
}
if (p->usb_status == USB_RET_ASYNC) {
ehci_flush_qh(q);
trace_usb_ehci_queue_action(q, "suspend");
trace_usb_ehci_packet_action(p->queue, p, "async");
p->async = EHCI_ASYNC_INFLIGHT;
ehci_set_state(q->ehci, async, EST_HORIZONTALQH);
again = 1;
ehci_fill_queue(p, async);
goto out;
}