IB/ipath: Support blinking LEDs with an led_override file
When we want to find an InfiniPath HCA in a rack of nodes, it is often expeditious to blink the status LEDs via a userspace /sys file. A write-only led_override "file" is published per device. Writes to this file are interpreted as (string form) numbers, and the resulting value sent to ipath_set_led_override(). The upper eight bits are interpretted as a 4.4 fixed-point "frequency in Hertz", and the bottom two 4-bit values are alternately (D0..3, then D4..7) used by the board-specific LED-setting function to override the normal state. Signed-off-by: Michael Albaugh <michael.albaugh@qlogic.com> Signed-off-by: Roland Dreier <rolandd@cisco.com>
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@ -1846,6 +1846,87 @@ void ipath_write_kreg_port(const struct ipath_devdata *dd, ipath_kreg regno,
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ipath_write_kreg(dd, where, value);
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}
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/*
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* Following deal with the "obviously simple" task of overriding the state
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* of the LEDS, which normally indicate link physical and logical status.
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* The complications arise in dealing with different hardware mappings
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* and the board-dependent routine being called from interrupts.
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* and then there's the requirement to _flash_ them.
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*/
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#define LED_OVER_FREQ_SHIFT 8
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#define LED_OVER_FREQ_MASK (0xFF<<LED_OVER_FREQ_SHIFT)
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/* Below is "non-zero" to force override, but both actual LEDs are off */
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#define LED_OVER_BOTH_OFF (8)
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void ipath_run_led_override(unsigned long opaque)
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{
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struct ipath_devdata *dd = (struct ipath_devdata *)opaque;
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int timeoff;
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int pidx;
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u64 lstate, ltstate, val;
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if (!(dd->ipath_flags & IPATH_INITTED))
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return;
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pidx = dd->ipath_led_override_phase++ & 1;
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dd->ipath_led_override = dd->ipath_led_override_vals[pidx];
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timeoff = dd->ipath_led_override_timeoff;
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/*
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* below potentially restores the LED values per current status,
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* should also possibly setup the traffic-blink register,
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* but leave that to per-chip functions.
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*/
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val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
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ltstate = (val >> INFINIPATH_IBCS_LINKTRAININGSTATE_SHIFT) &
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INFINIPATH_IBCS_LINKTRAININGSTATE_MASK;
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lstate = (val >> INFINIPATH_IBCS_LINKSTATE_SHIFT) &
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INFINIPATH_IBCS_LINKSTATE_MASK;
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dd->ipath_f_setextled(dd, lstate, ltstate);
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mod_timer(&dd->ipath_led_override_timer, jiffies + timeoff);
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}
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void ipath_set_led_override(struct ipath_devdata *dd, unsigned int val)
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{
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int timeoff, freq;
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if (!(dd->ipath_flags & IPATH_INITTED))
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return;
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/* First check if we are blinking. If not, use 1HZ polling */
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timeoff = HZ;
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freq = (val & LED_OVER_FREQ_MASK) >> LED_OVER_FREQ_SHIFT;
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if (freq) {
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/* For blink, set each phase from one nybble of val */
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dd->ipath_led_override_vals[0] = val & 0xF;
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dd->ipath_led_override_vals[1] = (val >> 4) & 0xF;
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timeoff = (HZ << 4)/freq;
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} else {
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/* Non-blink set both phases the same. */
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dd->ipath_led_override_vals[0] = val & 0xF;
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dd->ipath_led_override_vals[1] = val & 0xF;
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}
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dd->ipath_led_override_timeoff = timeoff;
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/*
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* If the timer has not already been started, do so. Use a "quick"
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* timeout so the function will be called soon, to look at our request.
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*/
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if (atomic_inc_return(&dd->ipath_led_override_timer_active) == 1) {
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/* Need to start timer */
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init_timer(&dd->ipath_led_override_timer);
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dd->ipath_led_override_timer.function =
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ipath_run_led_override;
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dd->ipath_led_override_timer.data = (unsigned long) dd;
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dd->ipath_led_override_timer.expires = jiffies + 1;
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add_timer(&dd->ipath_led_override_timer);
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} else {
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atomic_dec(&dd->ipath_led_override_timer_active);
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}
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}
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/**
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* ipath_shutdown_device - shut down a device
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* @dd: the infinipath device
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@ -1909,7 +1990,6 @@ void ipath_shutdown_device(struct ipath_devdata *dd)
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* Turn the LEDs off explictly for the same reason.
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*/
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dd->ipath_f_quiet_serdes(dd);
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dd->ipath_f_setextled(dd, 0, 0);
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if (dd->ipath_stats_timer_active) {
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del_timer_sync(&dd->ipath_stats_timer);
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@ -2085,6 +2165,16 @@ int ipath_reset_device(int unit)
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goto bail;
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}
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if (atomic_read(&dd->ipath_led_override_timer_active)) {
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/* Need to stop LED timer, _then_ shut off LEDs */
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del_timer_sync(&dd->ipath_led_override_timer);
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atomic_set(&dd->ipath_led_override_timer_active, 0);
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}
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/* Shut off LEDs after we are sure timer is not running */
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dd->ipath_led_override = LED_OVER_BOTH_OFF;
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dd->ipath_f_setextled(dd, 0, 0);
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dev_info(&dd->pcidev->dev, "Reset on unit %u requested\n", unit);
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if (!dd->ipath_kregbase || !(dd->ipath_flags & IPATH_PRESENT)) {
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@ -1065,6 +1065,16 @@ static void ipath_setup_ht_setextled(struct ipath_devdata *dd,
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if (ipath_diag_inuse)
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return;
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/* Allow override of LED display for, e.g. Locating system in rack */
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if (dd->ipath_led_override) {
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ltst = (dd->ipath_led_override & IPATH_LED_PHYS)
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? INFINIPATH_IBCS_LT_STATE_LINKUP
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: INFINIPATH_IBCS_LT_STATE_DISABLED;
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lst = (dd->ipath_led_override & IPATH_LED_LOG)
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? INFINIPATH_IBCS_L_STATE_ACTIVE
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: INFINIPATH_IBCS_L_STATE_DOWN;
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}
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/*
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* start by setting both LED control bits to off, then turn
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* on the appropriate bit(s).
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@ -797,6 +797,16 @@ static void ipath_setup_pe_setextled(struct ipath_devdata *dd, u64 lst,
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if (ipath_diag_inuse)
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return;
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/* Allow override of LED display for, e.g. Locating system in rack */
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if (dd->ipath_led_override) {
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ltst = (dd->ipath_led_override & IPATH_LED_PHYS)
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? INFINIPATH_IBCS_LT_STATE_LINKUP
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: INFINIPATH_IBCS_LT_STATE_DISABLED;
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lst = (dd->ipath_led_override & IPATH_LED_LOG)
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? INFINIPATH_IBCS_L_STATE_ACTIVE
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: INFINIPATH_IBCS_L_STATE_DOWN;
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}
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extctl = dd->ipath_extctrl & ~(INFINIPATH_EXTC_LED1PRIPORT_ON |
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INFINIPATH_EXTC_LED2PRIPORT_ON);
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@ -575,6 +575,16 @@ struct ipath_devdata {
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u16 ipath_gpio_scl_num;
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u64 ipath_gpio_sda;
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u64 ipath_gpio_scl;
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/* used to override LED behavior */
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u8 ipath_led_override; /* Substituted for normal value, if non-zero */
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u16 ipath_led_override_timeoff; /* delta to next timer event */
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u8 ipath_led_override_vals[2]; /* Alternates per blink-frame */
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u8 ipath_led_override_phase; /* Just counts, LSB picks from vals[] */
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atomic_t ipath_led_override_timer_active;
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/* Used to flash LEDs in override mode */
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struct timer_list ipath_led_override_timer;
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};
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/* Private data for file operations */
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@ -716,6 +726,15 @@ void ipath_get_eeprom_info(struct ipath_devdata *);
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u64 ipath_snap_cntr(struct ipath_devdata *, ipath_creg);
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void ipath_disarm_senderrbufs(struct ipath_devdata *, int);
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/*
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* Set LED override, only the two LSBs have "public" meaning, but
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* any non-zero value substitutes them for the Link and LinkTrain
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* LED states.
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*/
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#define IPATH_LED_PHYS 1 /* Physical (linktraining) GREEN LED */
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#define IPATH_LED_LOG 2 /* Logical (link) YELLOW LED */
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void ipath_set_led_override(struct ipath_devdata *dd, unsigned int val);
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/*
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* number of words used for protocol header if not set by ipath_userinit();
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*/
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@ -596,6 +596,23 @@ bail:
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return ret;
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}
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static ssize_t store_led_override(struct device *dev,
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struct device_attribute *attr,
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const char *buf,
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size_t count)
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{
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struct ipath_devdata *dd = dev_get_drvdata(dev);
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int ret;
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u16 val;
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ret = ipath_parse_ushort(buf, &val);
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if (ret > 0)
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ipath_set_led_override(dd, val);
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else
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ipath_dev_err(dd, "attempt to set invalid LED override\n");
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return ret;
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}
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static DRIVER_ATTR(num_units, S_IRUGO, show_num_units, NULL);
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static DRIVER_ATTR(version, S_IRUGO, show_version, NULL);
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static DEVICE_ATTR(boardversion, S_IRUGO, show_boardversion, NULL);
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static DEVICE_ATTR(unit, S_IRUGO, show_unit, NULL);
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static DEVICE_ATTR(rx_pol_inv, S_IWUSR, NULL, store_rx_pol_inv);
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static DEVICE_ATTR(led_override, S_IWUSR, NULL, store_led_override);
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static struct attribute *dev_attributes[] = {
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&dev_attr_guid.attr,
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&dev_attr_unit.attr,
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&dev_attr_enabled.attr,
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&dev_attr_rx_pol_inv.attr,
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&dev_attr_led_override.attr,
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NULL
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};
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