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ehci: trace guest bugs 

make qemu_queue_{cancel,reset} return the number of packets released,
so the caller can figure whenever there have been active packets even
though there shouldn't have been any.  Add tracepoint to log this.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
master
Gerd Hoffmann 2012-08-31 10:44:21 +02:00
parent 616789cde2
commit 5c514681ab
2 changed files with 21 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
hw/usb/hcd-ehci.c
View File

@ -716,6 +716,12 @@ static void ehci_trace_sitd(EHCIState *s, target_phys_addr_t addr,
(bool)(sitd->results & SITD_RESULTS_ACTIVE));
}
static void ehci_trace_guest_bug(EHCIState *s, const char *message)
{
trace_usb_ehci_guest_bug(message);
fprintf(stderr, "ehci warning: %s\n", message);
}
static inline bool ehci_enabled(EHCIState *s)
{
return s->usbcmd & USBCMD_RUNSTOP;
@ -785,27 +791,33 @@ static EHCIQueue *ehci_alloc_queue(EHCIState *ehci, uint32_t addr, int async)
return q;
}
static void ehci_cancel_queue(EHCIQueue *q)
static int ehci_cancel_queue(EHCIQueue *q)
{
EHCIPacket *p;
int packets = 0;
p = QTAILQ_FIRST(&q->packets);
if (p == NULL) {
return;
return 0;
}
trace_usb_ehci_queue_action(q, "cancel");
do {
ehci_free_packet(p);
packets++;
} while ((p = QTAILQ_FIRST(&q->packets)) != NULL);
return packets;
}
static void ehci_reset_queue(EHCIQueue *q)
static int ehci_reset_queue(EHCIQueue *q)
{
int packets;
trace_usb_ehci_queue_action(q, "reset");
ehci_cancel_queue(q);
packets = ehci_cancel_queue(q);
q->dev = NULL;
q->qtdaddr = 0;
return packets;
}
static void ehci_free_queue(EHCIQueue *q)
@ -1817,7 +1829,9 @@ static EHCIQueue *ehci_state_fetchqh(EHCIState *ehci, int async)
(memcmp(&qh.current_qtd, &q->qh.current_qtd,
9 * sizeof(uint32_t)) != 0) ||
(q->dev != NULL && q->dev->addr != devaddr)) {
ehci_reset_queue(q);
if (ehci_reset_queue(q) > 0) {
ehci_trace_guest_bug(ehci, "guest updated active QH");
}
p = NULL;
}
q->qh = qh;
@ -1979,8 +1993,8 @@ static int ehci_state_fetchqtd(EHCIQueue *q)
(!NLPTR_TBIT(p->qtd.next) && (p->qtd.next != qtd.next)) ||
(!NLPTR_TBIT(p->qtd.altnext) && (p->qtd.altnext != qtd.altnext)) ||
p->qtd.bufptr[0] != qtd.bufptr[0]) {
/* guest bug: guest updated active QH or qTD underneath us */
ehci_cancel_queue(q);
ehci_trace_guest_bug(q->ehci, "guest updated active QH or qTD");
p = NULL;
} else {
p->qtd = qtd;

1
trace-events
View File

@ -263,6 +263,7 @@ usb_ehci_data(int rw, uint32_t cpage, uint32_t offset, uint32_t addr, uint32_t l
usb_ehci_queue_action(void *q, const char *action) "q %p: %s"
usb_ehci_packet_action(void *q, void *p, const char *action) "q %p p %p: %s"
usb_ehci_irq(uint32_t level, uint32_t frindex, uint32_t sts, uint32_t mask) "level %d, frindex 0x%04x, sts 0x%x, mask 0x%x"
usb_ehci_guest_bug(const char *reason) "%s"
# hw/usb/hcd-uhci.c
usb_uhci_reset(void) "=== RESET ==="