qemu/0171-ehci-Don-t-set-seen-to-0-when-removing-unseen-queue-.patch
2012-10-28 14:05:07 -04:00

105 lines
3.8 KiB
Diff

From ade9c6dfbbf573c22800d7ff6df7f0de933e7c96 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 12 Sep 2012 15:08:32 +0200
Subject: [PATCH] ehci: Don't set seen to 0 when removing unseen queue-heads
When removing unseen queue-heads from the async queue list, we should not
set the seen flag to 0, as this may cause them to be removed by
ehci_queues_rip_unused() during the next call to ehci_advance_async_state()
if the timer is late or running at a low frequency.
Note:
1) This *may* have caused the instant unlink / relinks described in commit
9bc3a3a216e2689bfcdd36c3e079333bbdbf3ba0
2) Rather then putting more if-s inside ehci_queues_rip_unused, this patch
instead introduces a new ehci_queues_rip_unseen function.
3) This patch also makes it save to call ehci_queues_rip_unseen() multiple
times, which gets used in the folluw up patch titled:
"ehci: Walk async schedule before and after migration"
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 8f5457eb04140714eaf57a99bc08dc661d83fa87)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
hw/usb/hcd-ehci.c | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c
index 017a01d..bc86460 100644
--- a/hw/usb/hcd-ehci.c
+++ b/hw/usb/hcd-ehci.c
@@ -848,10 +848,10 @@ static EHCIQueue *ehci_find_queue_by_qh(EHCIState *ehci, uint32_t addr,
return NULL;
}
-static void ehci_queues_rip_unused(EHCIState *ehci, int async, int flush)
+static void ehci_queues_rip_unused(EHCIState *ehci, int async)
{
EHCIQueueHead *head = async ? &ehci->aqueues : &ehci->pqueues;
- const char *warn = (async && !flush) ? "guest unlinked busy QH" : NULL;
+ const char *warn = async ? "guest unlinked busy QH" : NULL;
uint64_t maxage = FRAME_TIMER_NS * ehci->maxframes * 4;
EHCIQueue *q, *tmp;
@@ -861,13 +861,25 @@ static void ehci_queues_rip_unused(EHCIState *ehci, int async, int flush)
q->ts = ehci->last_run_ns;
continue;
}
- if (!flush && ehci->last_run_ns < q->ts + maxage) {
+ if (ehci->last_run_ns < q->ts + maxage) {
continue;
}
ehci_free_queue(q, warn);
}
}
+static void ehci_queues_rip_unseen(EHCIState *ehci, int async)
+{
+ EHCIQueueHead *head = async ? &ehci->aqueues : &ehci->pqueues;
+ EHCIQueue *q, *tmp;
+
+ QTAILQ_FOREACH_SAFE(q, head, next, tmp) {
+ if (!q->seen) {
+ ehci_free_queue(q, NULL);
+ }
+ }
+}
+
static void ehci_queues_rip_device(EHCIState *ehci, USBDevice *dev, int async)
{
EHCIQueueHead *head = async ? &ehci->aqueues : &ehci->pqueues;
@@ -1700,7 +1712,7 @@ static int ehci_state_waitlisthead(EHCIState *ehci, int async)
ehci_set_usbsts(ehci, USBSTS_REC);
}
- ehci_queues_rip_unused(ehci, async, 0);
+ ehci_queues_rip_unused(ehci, async);
/* Find the head of the list (4.9.1.1) */
for(i = 0; i < MAX_QH; i++) {
@@ -2332,7 +2344,7 @@ static void ehci_advance_async_state(EHCIState *ehci)
*/
if (ehci->usbcmd & USBCMD_IAAD) {
/* Remove all unseen qhs from the async qhs queue */
- ehci_queues_rip_unused(ehci, async, 1);
+ ehci_queues_rip_unseen(ehci, async);
trace_usb_ehci_doorbell_ack();
ehci->usbcmd &= ~USBCMD_IAAD;
ehci_raise_irq(ehci, USBSTS_IAA);
@@ -2385,7 +2397,7 @@ static void ehci_advance_periodic_state(EHCIState *ehci)
ehci_set_fetch_addr(ehci, async,entry);
ehci_set_state(ehci, async, EST_FETCHENTRY);
ehci_advance_state(ehci, async);
- ehci_queues_rip_unused(ehci, async, 0);
+ ehci_queues_rip_unused(ehci, async);
break;
default:
--
1.7.12.1