[linux-2.6] / drivers / char / snsc_event.c

/*
 * SN Platform system controller communication support
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.
 */

/*
 * System controller event handler
 *
 * These routines deal with environmental events arriving from the
 * system controllers.
 */

#include <linux/interrupt.h>
#include <linux/sched.h>
#include <asm/byteorder.h>
#include <asm/sn/sn_sal.h>
#include <asm/unaligned.h>
#include "snsc.h"

static struct subch_data_s *event_sd;

void scdrv_event(unsigned long);
DECLARE_TASKLET(sn_sysctl_event, scdrv_event, 0);

/*
 * scdrv_event_interrupt
 *
 * Pull incoming environmental events off the physical link to the
 * system controller and put them in a temporary holding area in SAL.
 * Schedule scdrv_event() to move them along to their ultimate
 * destination.
 */
static irqreturn_t
scdrv_event_interrupt(int irq, void *subch_data)
{
	struct subch_data_s *sd = subch_data;
	unsigned long flags;
	int status;

	spin_lock_irqsave(&sd->sd_rlock, flags);
	status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch);

	if ((status > 0) && (status & SAL_IROUTER_INTR_RECV)) {
		tasklet_schedule(&sn_sysctl_event);
	}
	spin_unlock_irqrestore(&sd->sd_rlock, flags);
	return IRQ_HANDLED;
}


/*
 * scdrv_parse_event
 *
 * Break an event (as read from SAL) into useful pieces so we can decide
 * what to do with it.
 */
static int
scdrv_parse_event(char *event, int *src, int *code, int *esp_code, char *desc)
{
	char *desc_end;

	/* record event source address */
	*src = get_unaligned_be32(event);
	event += 4; 			/* move on to event code */

	/* record the system controller's event code */
	*code = get_unaligned_be32(event);
	event += 4;			/* move on to event arguments */

	/* how many arguments are in the packet? */
	if (*event++ != 2) {
		/* if not 2, give up */
		return -1;
	}

	/* parse out the ESP code */
	if (*event++ != IR_ARG_INT) {
		/* not an integer argument, so give up */
		return -1;
	}
	*esp_code = get_unaligned_be32(event);
	event += 4;

	/* parse out the event description */
	if (*event++ != IR_ARG_ASCII) {
		/* not an ASCII string, so give up */
		return -1;
	}
	event[CHUNKSIZE-1] = '\0';	/* ensure this string ends! */
	event += 2; 			/* skip leading CR/LF */
	desc_end = desc + sprintf(desc, "%s", event);

	/* strip trailing CR/LF (if any) */
	for (desc_end--;
	     (desc_end != desc) && ((*desc_end == 0xd) || (*desc_end == 0xa));
	     desc_end--) {
		*desc_end = '\0';
	}

	return 0;
}


/*
 * scdrv_event_severity
 *
 * Figure out how urgent a message we should write to the console/syslog
 * via printk.
 */
static char *
scdrv_event_severity(int code)
{
	int ev_class = (code & EV_CLASS_MASK);
	int ev_severity = (code & EV_SEVERITY_MASK);
	char *pk_severity = KERN_NOTICE;

	switch (ev_class) {
	case EV_CLASS_POWER:
		switch (ev_severity) {
		case EV_SEVERITY_POWER_LOW_WARNING:
		case EV_SEVERITY_POWER_HIGH_WARNING:
			pk_severity = KERN_WARNING;
			break;
		case EV_SEVERITY_POWER_HIGH_FAULT:
		case EV_SEVERITY_POWER_LOW_FAULT:
			pk_severity = KERN_ALERT;
			break;
		}
		break;
	case EV_CLASS_FAN:
		switch (ev_severity) {
		case EV_SEVERITY_FAN_WARNING:
			pk_severity = KERN_WARNING;
			break;
		case EV_SEVERITY_FAN_FAULT:
			pk_severity = KERN_CRIT;
			break;
		}
		break;
	case EV_CLASS_TEMP:
		switch (ev_severity) {
		case EV_SEVERITY_TEMP_ADVISORY:
			pk_severity = KERN_WARNING;
			break;
		case EV_SEVERITY_TEMP_CRITICAL:
			pk_severity = KERN_CRIT;
			break;
		case EV_SEVERITY_TEMP_FAULT:
			pk_severity = KERN_ALERT;
			break;
		}
		break;
	case EV_CLASS_ENV:
		pk_severity = KERN_ALERT;
		break;
	case EV_CLASS_TEST_FAULT:
		pk_severity = KERN_ALERT;
		break;
	case EV_CLASS_TEST_WARNING:
		pk_severity = KERN_WARNING;
		break;
	case EV_CLASS_PWRD_NOTIFY:
		pk_severity = KERN_ALERT;
		break;
	}

	return pk_severity;
}


/*
 * scdrv_dispatch_event
 *
 * Do the right thing with an incoming event.  That's often nothing
 * more than printing it to the system log.  For power-down notifications
 * we start a graceful shutdown.
 */
static void
scdrv_dispatch_event(char *event, int len)
{
	static int snsc_shutting_down = 0;
	int code, esp_code, src, class;
	char desc[CHUNKSIZE];
	char *severity;

	if (scdrv_parse_event(event, &src, &code, &esp_code, desc) < 0) {
		/* ignore uninterpretible event */
		return;
	}

	/* how urgent is the message? */
	severity = scdrv_event_severity(code);

	class = (code & EV_CLASS_MASK);

	if (class == EV_CLASS_PWRD_NOTIFY || code == ENV_PWRDN_PEND) {
		if (snsc_shutting_down)
			return;

		snsc_shutting_down = 1;

		/* give a message for each type of event */
		if (class == EV_CLASS_PWRD_NOTIFY)
			printk(KERN_NOTICE "Power off indication received."
			       " Sending SIGPWR to init...\n");
		else if (code == ENV_PWRDN_PEND)
			printk(KERN_CRIT "WARNING: Shutting down the system"
			       " due to a critical environmental condition."
			       " Sending SIGPWR to init...\n");

		/* give a SIGPWR signal to init proc */
		kill_cad_pid(SIGPWR, 0);
	} else {
		/* print to system log */
		printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
	}
}


/*
 * scdrv_event
 *
 * Called as a tasklet when an event arrives from the L1.  Read the event
 * from where it's temporarily stored in SAL and call scdrv_dispatch_event()
 * to send it on its way.  Keep trying to read events until SAL indicates
 * that there are no more immediately available.
 */
void
scdrv_event(unsigned long dummy)
{
	int status;
	int len;
	unsigned long flags;
	struct subch_data_s *sd = event_sd;

	/* anything to read? */
	len = CHUNKSIZE;
	spin_lock_irqsave(&sd->sd_rlock, flags);
	status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
				   sd->sd_rb, &len);

	while (!(status < 0)) {
		spin_unlock_irqrestore(&sd->sd_rlock, flags);
		scdrv_dispatch_event(sd->sd_rb, len);
		len = CHUNKSIZE;
		spin_lock_irqsave(&sd->sd_rlock, flags);
		status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
					   sd->sd_rb, &len);
	}
	spin_unlock_irqrestore(&sd->sd_rlock, flags);
}


/*
 * scdrv_event_init
 *
 * Sets up a system controller subchannel to begin receiving event
 * messages. This is sort of a specialized version of scdrv_open()
 * in drivers/char/sn_sysctl.c.
 */
void
scdrv_event_init(struct sysctl_data_s *scd)
{
	int rv;

	event_sd = kzalloc(sizeof (struct subch_data_s), GFP_KERNEL);
	if (event_sd == NULL) {
		printk(KERN_WARNING "%s: couldn't allocate subchannel info"
		       " for event monitoring\n", __func__);
		return;
	}

	/* initialize subch_data_s fields */
	event_sd->sd_nasid = scd->scd_nasid;
	spin_lock_init(&event_sd->sd_rlock);

	/* ask the system controllers to send events to this node */
	event_sd->sd_subch = ia64_sn_sysctl_event_init(scd->scd_nasid);

	if (event_sd->sd_subch < 0) {
		kfree(event_sd);
		printk(KERN_WARNING "%s: couldn't open event subchannel\n",
		       __func__);
		return;
	}

	/* hook event subchannel up to the system controller interrupt */
	rv = request_irq(SGI_UART_VECTOR, scdrv_event_interrupt,
			 IRQF_SHARED | IRQF_DISABLED,
			 "system controller events", event_sd);
	if (rv) {
		printk(KERN_WARNING "%s: irq request failed (%d)\n",
		       __func__, rv);
		ia64_sn_irtr_close(event_sd->sd_nasid, event_sd->sd_subch);
		kfree(event_sd);
		return;
	}
}
Commit	Line	Data
fc626b27 GH	1	/*
	2	* SN Platform system controller communication support
	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file "COPYING" in the main directory of this archive
	6	* for more details.
	7	*
28ff6b9b	8	* Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.
fc626b27 GH	9	*/
	10
	11	/*
	12	* System controller event handler
	13	*
	14	* These routines deal with environmental events arriving from the
	15	* system controllers.
	16	*/
	17
	18	#include <linux/interrupt.h>
	19	#include <linux/sched.h>
9a6ab769	20	#include <asm/byteorder.h>
fc626b27	21	#include <asm/sn/sn_sal.h>
1a402aac	22	#include <asm/unaligned.h>
fc626b27 GH	23	#include "snsc.h"
	24
	25	static struct subch_data_s *event_sd;
	26
	27	void scdrv_event(unsigned long);
	28	DECLARE_TASKLET(sn_sysctl_event, scdrv_event, 0);
	29
	30	/*
	31	* scdrv_event_interrupt
	32	*
	33	* Pull incoming environmental events off the physical link to the
	34	* system controller and put them in a temporary holding area in SAL.
	35	* Schedule scdrv_event() to move them along to their ultimate
	36	* destination.
	37	*/
	38	static irqreturn_t
7d12e780	39	scdrv_event_interrupt(int irq, void *subch_data)
fc626b27 GH	40	{
	41	struct subch_data_s *sd = subch_data;
	42	unsigned long flags;
	43	int status;
	44
	45	spin_lock_irqsave(&sd->sd_rlock, flags);
	46	status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch);
	47
	48	if ((status > 0) && (status & SAL_IROUTER_INTR_RECV)) {
	49	tasklet_schedule(&sn_sysctl_event);
	50	}
	51	spin_unlock_irqrestore(&sd->sd_rlock, flags);
	52	return IRQ_HANDLED;
	53	}
	54
	55
	56	/*
	57	* scdrv_parse_event
	58	*
	59	* Break an event (as read from SAL) into useful pieces so we can decide
	60	* what to do with it.
	61	*/
	62	static int
	63	scdrv_parse_event(char event, int src, int code, int esp_code, char *desc)
	64	{
	65	char *desc_end;
	66
	67	/* record event source address */
973ea70c	68	*src = get_unaligned_be32(event);
fc626b27 GH	69	event += 4; /* move on to event code */
	70
	71	/* record the system controller's event code */
973ea70c	72	*code = get_unaligned_be32(event);
fc626b27 GH	73	event += 4; /* move on to event arguments */
	74
	75	/* how many arguments are in the packet? */
	76	if (*event++ != 2) {
	77	/* if not 2, give up */
	78	return -1;
	79	}
	80
	81	/* parse out the ESP code */
	82	if (*event++ != IR_ARG_INT) {
	83	/* not an integer argument, so give up */
	84	return -1;
	85	}
973ea70c	86	*esp_code = get_unaligned_be32(event);
fc626b27 GH	87	event += 4;
	88
	89	/* parse out the event description */
	90	if (*event++ != IR_ARG_ASCII) {
	91	/* not an ASCII string, so give up */
	92	return -1;
	93	}
	94	event[CHUNKSIZE-1] = '\0'; /* ensure this string ends! */
	95	event += 2; /* skip leading CR/LF */
	96	desc_end = desc + sprintf(desc, "%s", event);
	97
	98	/* strip trailing CR/LF (if any) */
	99	for (desc_end--;
	100	(desc_end != desc) && ((desc_end == 0xd) \|\| (desc_end == 0xa));
	101	desc_end--) {
	102	*desc_end = '\0';
	103	}
	104
	105	return 0;
	106	}
	107
	108
	109	/*
	110	* scdrv_event_severity
	111	*
	112	* Figure out how urgent a message we should write to the console/syslog
	113	* via printk.
	114	*/
	115	static char *
	116	scdrv_event_severity(int code)
	117	{
	118	int ev_class = (code & EV_CLASS_MASK);
	119	int ev_severity = (code & EV_SEVERITY_MASK);
	120	char *pk_severity = KERN_NOTICE;
	121
	122	switch (ev_class) {
	123	case EV_CLASS_POWER:
	124	switch (ev_severity) {
	125	case EV_SEVERITY_POWER_LOW_WARNING:
	126	case EV_SEVERITY_POWER_HIGH_WARNING:
	127	pk_severity = KERN_WARNING;
	128	break;
	129	case EV_SEVERITY_POWER_HIGH_FAULT:
	130	case EV_SEVERITY_POWER_LOW_FAULT:
	131	pk_severity = KERN_ALERT;
	132	break;
	133	}
	134	break;
	135	case EV_CLASS_FAN:
	136	switch (ev_severity) {
	137	case EV_SEVERITY_FAN_WARNING:
	138	pk_severity = KERN_WARNING;
	139	break;
	140	case EV_SEVERITY_FAN_FAULT:
	141	pk_severity = KERN_CRIT;
	142	break;
	143	}
	144	break;
	145	case EV_CLASS_TEMP:
	146	switch (ev_severity) {
	147	case EV_SEVERITY_TEMP_ADVISORY:
	148	pk_severity = KERN_WARNING;
	149	break;
	150	case EV_SEVERITY_TEMP_CRITICAL:
151	pk_severity = KERN_CRIT;
152	break;
153	case EV_SEVERITY_TEMP_FAULT:
154	pk_severity = KERN_ALERT;
155	break;
156	}
157	break;
158	case EV_CLASS_ENV:
159	pk_severity = KERN_ALERT;
160	break;
161	case EV_CLASS_TEST_FAULT:
162	pk_severity = KERN_ALERT;
163	break;
164	case EV_CLASS_TEST_WARNING:
165	pk_severity = KERN_WARNING;
166	break;
167	case EV_CLASS_PWRD_NOTIFY:
168	pk_severity = KERN_ALERT;
169	break;
170	}
171
172	return pk_severity;
173	}
174
175
176	/*
177	* scdrv_dispatch_event
178	*
179	* Do the right thing with an incoming event. That's often nothing
180	* more than printing it to the system log. For power-down notifications
181	* we start a graceful shutdown.
182	*/
183	static void
184	scdrv_dispatch_event(char *event, int len)
185	{
28ff6b9b AY	186	static int snsc_shutting_down = 0;
28ff6b9b AY	187	int code, esp_code, src, class;
fc626b27 GH	188	char desc[CHUNKSIZE];
	189	char *severity;
	190
	191	if (scdrv_parse_event(event, &src, &code, &esp_code, desc) < 0) {
	192	/* ignore uninterpretible event */
	193	return;
	194	}
	195
	196	/* how urgent is the message? */
	197	severity = scdrv_event_severity(code);
	198
28ff6b9b AY	199	class = (code & EV_CLASS_MASK);
	200
	201	if (class == EV_CLASS_PWRD_NOTIFY \|\| code == ENV_PWRDN_PEND) {
28ff6b9b AY	202	if (snsc_shutting_down)
	203	return;
	204
	205	snsc_shutting_down = 1;
	206
	207	/* give a message for each type of event */
	208	if (class == EV_CLASS_PWRD_NOTIFY)
	209	printk(KERN_NOTICE "Power off indication received."
	210	" Sending SIGPWR to init...\n");
	211	else if (code == ENV_PWRDN_PEND)
	212	printk(KERN_CRIT "WARNING: Shutting down the system"
	213	" due to a critical environmental condition."
	214	" Sending SIGPWR to init...\n");
	215
fc626b27	216	/* give a SIGPWR signal to init proc */
9ec52099	217	kill_cad_pid(SIGPWR, 0);
fc626b27 GH	218	} else {
	219	/* print to system log */
	220	printk("%s\|$(0x%x)%s\n", severity, esp_code, desc);
	221	}
	222	}
	223
	224
	225	/*
	226	* scdrv_event
	227	*
	228	* Called as a tasklet when an event arrives from the L1. Read the event
	229	* from where it's temporarily stored in SAL and call scdrv_dispatch_event()
	230	* to send it on its way. Keep trying to read events until SAL indicates
	231	* that there are no more immediately available.
	232	*/
	233	void
	234	scdrv_event(unsigned long dummy)
	235	{
	236	int status;
	237	int len;
	238	unsigned long flags;
	239	struct subch_data_s *sd = event_sd;
	240
	241	/* anything to read? */
	242	len = CHUNKSIZE;
	243	spin_lock_irqsave(&sd->sd_rlock, flags);
	244	status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
	245	sd->sd_rb, &len);
	246
	247	while (!(status < 0)) {
	248	spin_unlock_irqrestore(&sd->sd_rlock, flags);
	249	scdrv_dispatch_event(sd->sd_rb, len);
	250	len = CHUNKSIZE;
	251	spin_lock_irqsave(&sd->sd_rlock, flags);
	252	status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
	253	sd->sd_rb, &len);
	254	}
	255	spin_unlock_irqrestore(&sd->sd_rlock, flags);
	256	}
	257
	258
	259	/*
	260	* scdrv_event_init
	261	*
	262	* Sets up a system controller subchannel to begin receiving event
	263	* messages. This is sort of a specialized version of scdrv_open()
	264	* in drivers/char/sn_sysctl.c.
	265	*/
	266	void
	267	scdrv_event_init(struct sysctl_data_s *scd)
	268	{
	269	int rv;
	270
40953ed8	271	event_sd = kzalloc(sizeof (struct subch_data_s), GFP_KERNEL);
fc626b27 GH	272	if (event_sd == NULL) {
fc626b27 GH	273	printk(KERN_WARNING "%s: couldn't allocate subchannel info"
bf9d8929	274	" for event monitoring\n", __func__);
fc626b27 GH	275	return;
	276	}
	277
	278	/* initialize subch_data_s fields */
fc626b27 GH	279	event_sd->sd_nasid = scd->scd_nasid;
	280	spin_lock_init(&event_sd->sd_rlock);
	281
	282	/* ask the system controllers to send events to this node */
	283	event_sd->sd_subch = ia64_sn_sysctl_event_init(scd->scd_nasid);
	284
	285	if (event_sd->sd_subch < 0) {
	286	kfree(event_sd);
	287	printk(KERN_WARNING "%s: couldn't open event subchannel\n",
bf9d8929	288	__func__);
fc626b27 GH	289	return;
	290	}
	291
	292	/* hook event subchannel up to the system controller interrupt */
	293	rv = request_irq(SGI_UART_VECTOR, scdrv_event_interrupt,
0f2ed4c6	294	IRQF_SHARED \| IRQF_DISABLED,
fc626b27 GH	295	"system controller events", event_sd);
	296	if (rv) {
	297	printk(KERN_WARNING "%s: irq request failed (%d)\n",
bf9d8929	298	__func__, rv);
fc626b27 GH	299	ia64_sn_irtr_close(event_sd->sd_nasid, event_sd->sd_subch);
	300	kfree(event_sd);
	301	return;
	302	}
	303	}