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ehci: Add ehci_verify_qh and ehci_verify_qtd helper functions 

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Hans de Goede 2012-12-14 14:35:23 +01:00 committed by Gerd Hoffmann
parent f881c8d36b
commit c643263409
1 changed files with 35 additions and 16 deletions
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51
hw/usb/hcd-ehci.c
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@ -438,6 +438,36 @@ static inline bool ehci_periodic_enabled(EHCIState *s)
return ehci_enabled(s) && (s->usbcmd & USBCMD_PSE);
}
static bool ehci_verify_qh(EHCIQueue *q, EHCIqh *qh)
{
uint32_t devaddr = get_field(qh->epchar, QH_EPCHAR_DEVADDR);
uint32_t endp = get_field(qh->epchar, QH_EPCHAR_EP);
if ((devaddr != get_field(q->qh.epchar, QH_EPCHAR_DEVADDR)) ||
(endp != get_field(q->qh.epchar, QH_EPCHAR_EP)) ||
(qh->current_qtd != q->qh.current_qtd) ||
(q->async && qh->next_qtd != q->qh.next_qtd) ||
(memcmp(&qh->altnext_qtd, &q->qh.altnext_qtd,
7 * sizeof(uint32_t)) != 0) ||
(q->dev != NULL && q->dev->addr != devaddr)) {
return false;
} else {
return true;
}
}
static bool ehci_verify_qtd(EHCIPacket *p, EHCIqtd *qtd)
{
if (p->qtdaddr != p->queue->qtdaddr ||
(p->queue->async && !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]) {
return false;
} else {
return true;
}
}
/* Finish executing and writeback a packet outside of the regular
fetchqh -> fetchqtd -> execute -> writeback cycle */
static void ehci_writeback_async_complete_packet(EHCIPacket *p)
@ -1557,8 +1587,8 @@ out:
static EHCIQueue *ehci_state_fetchqh(EHCIState *ehci, int async)
{
uint32_t entry;
EHCIPacket *p;
uint32_t entry, devaddr, endp;
EHCIQueue *q;
EHCIqh qh;
@ -1588,15 +1618,7 @@ static EHCIQueue *ehci_state_fetchqh(EHCIState *ehci, int async)
* The overlay area of the qh should never be changed by the guest,
* except when idle, in which case the reset is a nop.
*/
devaddr = get_field(qh.epchar, QH_EPCHAR_DEVADDR);
endp = get_field(qh.epchar, QH_EPCHAR_EP);
if ((devaddr != get_field(q->qh.epchar, QH_EPCHAR_DEVADDR)) ||
(endp != get_field(q->qh.epchar, QH_EPCHAR_EP)) ||
(qh.current_qtd != q->qh.current_qtd) ||
(q->async && qh.next_qtd != q->qh.next_qtd) ||
(memcmp(&qh.altnext_qtd, &q->qh.altnext_qtd,
7 * sizeof(uint32_t)) != 0) ||
(q->dev != NULL && q->dev->addr != devaddr)) {
if (!ehci_verify_qh(q, &qh)) {
if (ehci_reset_queue(q) > 0) {
ehci_trace_guest_bug(ehci, "guest updated active QH");
}
@ -1610,7 +1632,8 @@ static EHCIQueue *ehci_state_fetchqh(EHCIState *ehci, int async)
}
if (q->dev == NULL) {
q->dev = ehci_find_device(q->ehci, devaddr);
q->dev = ehci_find_device(q->ehci,
get_field(q->qh.epchar, QH_EPCHAR_DEVADDR));
}
if (p && p->async == EHCI_ASYNC_FINISHED) {
@ -1768,11 +1791,7 @@ static int ehci_state_fetchqtd(EHCIQueue *q)
p = QTAILQ_FIRST(&q->packets);
if (p != NULL) {
if (p->qtdaddr != q->qtdaddr ||
(q->async && !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]) {
if (!ehci_verify_qtd(p, &qtd)) {
ehci_cancel_queue(q);
ehci_trace_guest_bug(q->ehci, "guest updated active QH or qTD");
p = NULL;