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Add support for throttling UMASS.

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Mostly useful for debugging purposes.

MFC after:	1 week
This commit is contained in:
Hans Petter Selasky 2012-12-20 17:14:10 +00:00
parent 3d6709a572
commit f578aba724
1 changed files with 24 additions and 2 deletions
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26
sys/dev/usb/storage/umass.c
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@ -163,12 +163,16 @@ __FBSDID("$FreeBSD$");
#define UDMASS_CBI 0x00400000 /* CBI transfers */
#define UDMASS_WIRE (UDMASS_BBB|UDMASS_CBI)
#define UDMASS_ALL 0xffff0000 /* all of the above */
static int umass_debug = 0;
static int umass_debug;
static int umass_throttle;
static SYSCTL_NODE(_hw_usb, OID_AUTO, umass, CTLFLAG_RW, 0, "USB umass");
SYSCTL_INT(_hw_usb_umass, OID_AUTO, debug, CTLFLAG_RW | CTLFLAG_TUN,
&umass_debug, 0, "umass debug level");
TUNABLE_INT("hw.usb.umass.debug", &umass_debug);
SYSCTL_INT(_hw_usb_umass, OID_AUTO, throttle, CTLFLAG_RW | CTLFLAG_TUN,
&umass_throttle, 0, "Forced delay between commands in milliseconds");
TUNABLE_INT("hw.usb.umass.throttle", &umass_throttle);
#else
#define DIF(...) do { } while (0)
#define DPRINTF(...) do { } while (0)
@ -881,7 +885,7 @@ umass_attach(device_t dev)
struct usb_attach_arg *uaa = device_get_ivars(dev);
struct umass_probe_proto temp = umass_probe_proto(dev, uaa);
struct usb_interface_descriptor *id;
int32_t err;
int err;
/*
* NOTE: the softc struct is cleared in device_set_driver.
@ -994,6 +998,24 @@ umass_attach(device_t dev)
"transfers, %s\n", usbd_errstr(err));
goto detach;
}
#ifdef USB_DEBUG
if (umass_throttle > 0) {
uint8_t x;
int iv;
iv = umass_throttle;
if (iv < 1)
iv = 1;
else if (iv > 8000)
iv = 8000;
for (x = 0; x != UMASS_T_MAX; x++) {
if (sc->sc_xfer[x] != NULL)
usbd_xfer_set_interval(sc->sc_xfer[x], iv);
}
}
#endif
sc->sc_transform =
(sc->sc_proto & UMASS_PROTO_SCSI) ? &umass_scsi_transform :
(sc->sc_proto & UMASS_PROTO_UFI) ? &umass_ufi_transform :