Date: Mon, 12 Mar 2012 09:15:18 +0100 From: Hans Petter Selasky <hselasky@c2i.net> To: Brandon Gooch <jamesbrandongooch@gmail.com> Cc: Alexander Motin <mav@freebsd.org>, Nathan Whitehorn <nwhitehorn@freebsd.org>, "freebsd-usb@freebsd.org" <freebsd-usb@freebsd.org> Subject: Re: Ongoing battle with umass(4) and xhci(4) Message-ID: <201203120915.18908.hselasky@c2i.net> In-Reply-To: <CALBk6y%2BoYS4CuXpt0Uwm_KsSPKyhtn2mCHaSk7O0meWoPB1ZzA@mail.gmail.com> References: <CALBk6y%2BoYS4CuXpt0Uwm_KsSPKyhtn2mCHaSk7O0meWoPB1ZzA@mail.gmail.com>
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>
> Is there something fishy happening between the USB stack and CAM? hmmm...
>
No,
It is not the CAM layer this time, though there are some bugs there too.
In the beginning of the log I see that in the successful case we receive a
stall event:
-xhci_check_transfer: slot=1 epno=3 remainder=13 status=6
-xhci_check_transfer: TD is last
-xhci_cmd_stop_ep:
-xhci_check_command: Received command event
-xhci_configure_reset_endpoint: Could not stop endpoint 3
-xhci_cmd_reset_ep:
-xhci_check_command: Received command event
-xhci_cmd_set_tr_dequeue_ptr:
-xhci_check_command: Received command event
-xhci_cmd_evaluate_ctx:
-xhci_check_command: Received command event
-xhci_cmd_configure_ep:
-xhci_check_command: Received command event
-xhci_configure_reset_endpoint: Could not configure endpoint 3
-xhci_ep_clear_stall:
-xhci_device_generic_enter:
-xhci_setup_generic_chain_sub: NTRB=1
-xhci_setup_generic_chain_sub: LINK=0x82883180
-xhci_setup_generic_chain_sub: NTRB=1
-xhci_setup_generic_chain_sub: LINK=0x82883000
-xhci_setup_generic_chain: first=0xffffff8460883300 last=0xffffff8460883180
-xhci_device_generic_start:
-xhci_transfer_insert: qh_pos = 1
-xhci_check_transfer: slot=1 epno=1 remainder=0 status=1
-xhci_check_transfer: slot=1 epno=1 remainder=0 status=1
-xhci_check_transfer: Following next TD
-xhci_check_transfer: slot=1 epno=1 remainder=0 status=1
-xhci_check_transfer: slot=1 epno=1 remainder=0 status=1
-xhci_check_transfer: TD is last
This is not received in the failing case.
Maybe this indicates a lost interrupt or something like that?
In /sys/dev/usb/controller/xhci.c
static void
xhci_interrupt_poll(struct xhci_softc *sc)
Add a printf:
if (i == XHCI_MAX_EVENTS) {
i = 0;
j ^= 1;
/* check for timeout */
if (!--t) {
+ printf("XHCI: Timeout\n");
break;
}
}
See if what happens.
Also change the xhci.c code to call
xhci_interrupt_poll() two times instead of one.
--HPS
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