Commit 91ab4ed3 authored by Easwar Hariharan's avatar Easwar Hariharan Committed by Doug Ledford
Browse files

staging/rdma/hfi1: Implement LED beaconing for maintenance 



This patch implements LED beaconing for maintenance. A MAD packet with
the LEDInfo attribute set to 1 will enable LED beaconing with a duty
cycle of 2s on and 1.5s off. A MAD packet with the LEDInfo attribute
set to 0 will disable beaconing and return the LED to normal operation.

Reviewed-by: default avatarDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: default avatarEaswar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: default avatarMitko Haralanov <mitko.haralanov@intel.com>
Signed-off-by: default avatarJubin John <jubin.john@intel.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 7b0b01aa

drivers/staging/rdma/hfi1/driver.c

+38 −43
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
 *

 * GPL LICENSE SUMMARY

 *

 * Copyright(c) 2015 Intel Corporation.

 * Copyright(c) 2015, 2016 Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as
@@ -18,7 +18,7 @@ 
 *

 * BSD LICENSE

 *

 * Copyright(c) 2015 Intel Corporation.

 * Copyright(c) 2015, 2016 Intel Corporation.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions
@@ -1172,63 +1172,64 @@ int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc) 
	return 0;

}



/*

 * Following deal with the "obviously simple" task of overriding the state

 * of the LEDs, which normally indicate link physical and logical status.

 * The complications arise in dealing with different hardware mappings

 * and the board-dependent routine being called from interrupts.

 * and then there's the requirement to _flash_ them.

 */

#define LED_OVER_FREQ_SHIFT 8

#define LED_OVER_FREQ_MASK (0xFF<<LED_OVER_FREQ_SHIFT)

/* Below is "non-zero" to force override, but both actual LEDs are off */

#define LED_OVER_BOTH_OFF (8)

void shutdown_led_override(struct hfi1_pportdata *ppd)

{

	struct hfi1_devdata *dd = ppd->dd;



	if (atomic_read(&ppd->led_override_timer_active)) {

		del_timer_sync(&ppd->led_override_timer);

		atomic_set(&ppd->led_override_timer_active, 0);

	}



	/* Shut off LEDs after we are sure timer is not running */

	setextled(dd, 0);

}



static void run_led_override(unsigned long opaque)

{

	struct hfi1_pportdata *ppd = (struct hfi1_pportdata *)opaque;

	struct hfi1_devdata *dd = ppd->dd;

	int timeoff;

	int ph_idx;

	unsigned long timeout;

	int phase_idx;



	if (!(dd->flags & HFI1_INITTED))

		return;



	ph_idx = ppd->led_override_phase++ & 1;

	ppd->led_override = ppd->led_override_vals[ph_idx];

	timeoff = ppd->led_override_timeoff;

	phase_idx = ppd->led_override_phase & 1;

	setextled(dd, phase_idx);



	timeout = ppd->led_override_vals[phase_idx];

	/* Set up for next phase */

	ppd->led_override_phase = !ppd->led_override_phase;



	/*

	 * don't re-fire the timer if user asked for it to be off; we let

	 * it fire one more time after they turn it off to simplify

	 */

	if (ppd->led_override_vals[0] || ppd->led_override_vals[1])

		mod_timer(&ppd->led_override_timer, jiffies + timeoff);

		mod_timer(&ppd->led_override_timer, jiffies + timeout);

	else

		/* Hand control of the LED to the DC for normal operation */

		write_csr(dd, DCC_CFG_LED_CNTRL, 0);

}



void hfi1_set_led_override(struct hfi1_pportdata *ppd, unsigned int val)

/*

 * To have the LED blink in a particular pattern, provide timeon and timeoff

 * in milliseconds. To turn off custom blinking and return to normal operation,

 * provide timeon = timeoff = 0.

 */

void hfi1_set_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,

			   unsigned int timeoff)

{

	struct hfi1_devdata *dd = ppd->dd;

	int timeoff, freq;



	if (!(dd->flags & HFI1_INITTED))

		return;



	/* First check if we are blinking. If not, use 1HZ polling */

	timeoff = HZ;

	freq = (val & LED_OVER_FREQ_MASK) >> LED_OVER_FREQ_SHIFT;



	if (freq) {

		/* For blink, set each phase from one nybble of val */

		ppd->led_override_vals[0] = val & 0xF;

		ppd->led_override_vals[1] = (val >> 4) & 0xF;

		timeoff = (HZ << 4)/freq;

	} else {

		/* Non-blink set both phases the same. */

		ppd->led_override_vals[0] = val & 0xF;

		ppd->led_override_vals[1] = val & 0xF;

	}

	ppd->led_override_timeoff = timeoff;

	/* Convert to jiffies for direct use in timer */

	ppd->led_override_vals[0] = msecs_to_jiffies(timeoff);

	ppd->led_override_vals[1] = msecs_to_jiffies(timeon);

	ppd->led_override_phase = 1; /* Arbitrarily start from LED on phase */



	/*

	 * If the timer has not already been started, do so. Use a "quick"
@@ -1293,14 +1294,8 @@ int hfi1_reset_device(int unit) 


	for (pidx = 0; pidx < dd->num_pports; ++pidx) {

		ppd = dd->pport + pidx;

		if (atomic_read(&ppd->led_override_timer_active)) {

			/* Need to stop LED timer, _then_ shut off LEDs */

			del_timer_sync(&ppd->led_override_timer);

			atomic_set(&ppd->led_override_timer_active, 0);

		}



		/* Shut off LEDs after we are sure timer is not running */

		ppd->led_override = LED_OVER_BOTH_OFF;

		shutdown_led_override(ppd);

	}

	if (dd->flags & HFI1_HAS_SEND_DMA)

		sdma_exit(dd);

drivers/staging/rdma/hfi1/hfi.h

+16 −13
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ 
 *

 * GPL LICENSE SUMMARY

 *

 * Copyright(c) 2015 Intel Corporation.

 * Copyright(c) 2015, 2016 Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as
@@ -20,7 +20,7 @@ 
 *

 * BSD LICENSE

 *

 * Copyright(c) 2015 Intel Corporation.

 * Copyright(c) 2015, 2016 Intel Corporation.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions
@@ -669,14 +669,17 @@ struct hfi1_pportdata { 
	u8 overrun_threshold;

	u8 phy_error_threshold;



	/* used to override LED behavior */

	u8 led_override;  /* Substituted for normal value, if non-zero */

	u16 led_override_timeoff; /* delta to next timer event */

	u8 led_override_vals[2]; /* Alternates per blink-frame */

	u8 led_override_phase; /* Just counts, LSB picks from vals[] */

	/* Used to override LED behavior for things like maintenance beaconing*/

	/*

	 * Alternates per phase of blink

	 * [0] holds LED off duration, [1] holds LED on duration

	 */

	unsigned long led_override_vals[2];

	u8 led_override_phase; /* LSB picks from vals[] */

	atomic_t led_override_timer_active;

	/* Used to flash LEDs in override mode */

	struct timer_list led_override_timer;



	u32 sm_trap_qp;

	u32 sa_qp;
@@ -1599,14 +1602,14 @@ void hfi1_free_devdata(struct hfi1_devdata *); 
void cc_state_reclaim(struct rcu_head *rcu);

struct hfi1_devdata *hfi1_alloc_devdata(struct pci_dev *pdev, size_t extra);



void hfi1_set_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,

			   unsigned int timeoff);

/*

 * Set LED override, only the two LSBs have "public" meaning, but

 * any non-zero value substitutes them for the Link and LinkTrain

 * LED states.

 * Only to be used for driver unload or device reset where we cannot allow

 * the timer to fire even the one extra time, else use hfi1_set_led_override

 * with timeon = timeoff = 0

 */

#define HFI1_LED_PHYS 1 /* Physical (linktraining) GREEN LED */

#define HFI1_LED_LOG 2  /* Logical (link) YELLOW LED */

void hfi1_set_led_override(struct hfi1_pportdata *ppd, unsigned int val);

void shutdown_led_override(struct hfi1_pportdata *ppd);



#define HFI1_CREDIT_RETURN_RATE (100)

drivers/staging/rdma/hfi1/init.c

+4 −2
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
 *

 * GPL LICENSE SUMMARY

 *

 * Copyright(c) 2015 Intel Corporation.

 * Copyright(c) 2015, 2016 Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as
@@ -18,7 +18,7 @@ 
 *

 * BSD LICENSE

 *

 * Copyright(c) 2015 Intel Corporation.

 * Copyright(c) 2015, 2016 Intel Corporation.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions
@@ -908,6 +908,8 @@ static void shutdown_device(struct hfi1_devdata *dd) 
		/* disable the send device */

		pio_send_control(dd, PSC_GLOBAL_DISABLE);



		shutdown_led_override(ppd);



		/*

		 * Clear SerdesEnable.

		 * We can't count on interrupts since we are stopping.

drivers/staging/rdma/hfi1/mad.c

+6 −3
Original line number Diff line number Diff line
@@ -5,7 +5,7 @@ 
 *

 * GPL LICENSE SUMMARY

 *

 * Copyright(c) 2015 Intel Corporation.

 * Copyright(c) 2015, 2016 Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of version 2 of the GNU General Public License as
@@ -18,7 +18,7 @@ 
 *

 * BSD LICENSE

 *

 * Copyright(c) 2015 Intel Corporation.

 * Copyright(c) 2015, 2016 Intel Corporation.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions
@@ -3449,7 +3449,10 @@ static int __subn_set_opa_led_info(struct opa_smp *smp, u32 am, u8 *data, 
		return reply((struct ib_mad_hdr *)smp);

	}



	setextled(dd, on);

	if (on)

		hfi1_set_led_override(dd->pport, 2000, 1500);

	else

		hfi1_set_led_override(dd->pport, 0, 0);



	return __subn_get_opa_led_info(smp, am, data, ibdev, port, resp_len);

}

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