[linux-2.6-block.git] / 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 <linux/byteorder/generic.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 pt_regs *regs)
{
	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;
	__be32 from_buf;

	/* record event source address */
	from_buf = get_unaligned((__be32 *)event);
	*src = be32_to_cpup(&from_buf);
	event += 4; 			/* move on to event code */

	/* record the system controller's event code */
	from_buf = get_unaligned((__be32 *)event);
	*code = be32_to_cpup(&from_buf);
	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;
	}
	from_buf = get_unaligned((__be32 *)event);
	*esp_code = be32_to_cpup(&from_buf);
	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) {
		struct task_struct *p;

		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 */

		/* first find init's task */
		read_lock(&tasklist_lock);
		for_each_process(p) {
			if (p->pid == 1)
				break;
		}
		if (p) {
			force_sig(SIGPWR, p);
		} else {
			printk(KERN_ERR "Failed to signal init!\n");
			snsc_shutting_down = 0; /* so can try again (?) */
		}
		read_unlock(&tasklist_lock);
	} 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", __FUNCTION__);
		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",
		       __FUNCTION__);
		return;
	}

	/* hook event subchannel up to the system controller interrupt */
	rv = request_irq(SGI_UART_VECTOR, scdrv_event_interrupt,
			 SA_SHIRQ | SA_INTERRUPT,
			 "system controller events", event_sd);
	if (rv) {
		printk(KERN_WARNING "%s: irq request failed (%d)\n",
		       __FUNCTION__, 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>
	20	#include <linux/byteorder/generic.h>
	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
	39	scdrv_event_interrupt(int irq, void subch_data, struct pt_regs regs)
	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;
1a402aac	66	__be32 from_buf;
fc626b27 GH	67
fc626b27 GH	68	/* record event source address */
1a402aac GH	69	from_buf = get_unaligned((__be32 *)event);
1a402aac GH	70	*src = be32_to_cpup(&from_buf);
fc626b27 GH	71	event += 4; /* move on to event code */
	72
	73	/* record the system controller's event code */
1a402aac GH	74	from_buf = get_unaligned((__be32 *)event);
1a402aac GH	75	*code = be32_to_cpup(&from_buf);
fc626b27 GH	76	event += 4; /* move on to event arguments */
	77
	78	/* how many arguments are in the packet? */
	79	if (*event++ != 2) {
	80	/* if not 2, give up */
	81	return -1;
	82	}
	83
	84	/* parse out the ESP code */
	85	if (*event++ != IR_ARG_INT) {
	86	/* not an integer argument, so give up */
	87	return -1;
	88	}
1a402aac GH	89	from_buf = get_unaligned((__be32 *)event);
1a402aac GH	90	*esp_code = be32_to_cpup(&from_buf);
fc626b27 GH	91	event += 4;
	92
	93	/* parse out the event description */
	94	if (*event++ != IR_ARG_ASCII) {
	95	/* not an ASCII string, so give up */
	96	return -1;
	97	}
	98	event[CHUNKSIZE-1] = '\0'; /* ensure this string ends! */
	99	event += 2; /* skip leading CR/LF */
	100	desc_end = desc + sprintf(desc, "%s", event);
	101
	102	/* strip trailing CR/LF (if any) */
	103	for (desc_end--;
	104	(desc_end != desc) && ((desc_end == 0xd) \|\| (desc_end == 0xa));
	105	desc_end--) {
	106	*desc_end = '\0';
	107	}
	108
	109	return 0;
	110	}
	111
	112
	113	/*
	114	* scdrv_event_severity
	115	*
	116	* Figure out how urgent a message we should write to the console/syslog
	117	* via printk.
	118	*/
	119	static char *
	120	scdrv_event_severity(int code)
	121	{
	122	int ev_class = (code & EV_CLASS_MASK);
	123	int ev_severity = (code & EV_SEVERITY_MASK);
	124	char *pk_severity = KERN_NOTICE;
	125
	126	switch (ev_class) {
	127	case EV_CLASS_POWER:
	128	switch (ev_severity) {
	129	case EV_SEVERITY_POWER_LOW_WARNING:
	130	case EV_SEVERITY_POWER_HIGH_WARNING:
	131	pk_severity = KERN_WARNING;
	132	break;
	133	case EV_SEVERITY_POWER_HIGH_FAULT:
	134	case EV_SEVERITY_POWER_LOW_FAULT:
	135	pk_severity = KERN_ALERT;
	136	break;
	137	}
	138	break;
	139	case EV_CLASS_FAN:
	140	switch (ev_severity) {
	141	case EV_SEVERITY_FAN_WARNING:
	142	pk_severity = KERN_WARNING;
	143	break;
	144	case EV_SEVERITY_FAN_FAULT:
	145	pk_severity = KERN_CRIT;
	146	break;
	147	}
	148	break;
	149	case EV_CLASS_TEMP:
	150	switch (ev_severity) {
	151	case EV_SEVERITY_TEMP_ADVISORY:
	152	pk_severity = KERN_WARNING;
	153	break;
	154	case EV_SEVERITY_TEMP_CRITICAL:
155	pk_severity = KERN_CRIT;
156	break;
157	case EV_SEVERITY_TEMP_FAULT:
158	pk_severity = KERN_ALERT;
159	break;
160	}
161	break;
162	case EV_CLASS_ENV:
163	pk_severity = KERN_ALERT;
164	break;
165	case EV_CLASS_TEST_FAULT:
166	pk_severity = KERN_ALERT;
167	break;
168	case EV_CLASS_TEST_WARNING:
169	pk_severity = KERN_WARNING;
170	break;
171	case EV_CLASS_PWRD_NOTIFY:
172	pk_severity = KERN_ALERT;
173	break;
174	}
175
176	return pk_severity;
177	}
178
179
180	/*
181	* scdrv_dispatch_event
182	*
183	* Do the right thing with an incoming event. That's often nothing
184	* more than printing it to the system log. For power-down notifications
185	* we start a graceful shutdown.
186	*/
187	static void
188	scdrv_dispatch_event(char *event, int len)
189	{
28ff6b9b AY	190	static int snsc_shutting_down = 0;
28ff6b9b AY	191	int code, esp_code, src, class;
fc626b27 GH	192	char desc[CHUNKSIZE];
	193	char *severity;
	194
	195	if (scdrv_parse_event(event, &src, &code, &esp_code, desc) < 0) {
	196	/* ignore uninterpretible event */
	197	return;
	198	}
	199
	200	/* how urgent is the message? */
	201	severity = scdrv_event_severity(code);
	202
28ff6b9b AY	203	class = (code & EV_CLASS_MASK);
	204
	205	if (class == EV_CLASS_PWRD_NOTIFY \|\| code == ENV_PWRDN_PEND) {
fc626b27 GH	206	struct task_struct *p;
fc626b27 GH	207
28ff6b9b AY	208	if (snsc_shutting_down)
	209	return;
	210
	211	snsc_shutting_down = 1;
	212
	213	/* give a message for each type of event */
	214	if (class == EV_CLASS_PWRD_NOTIFY)
	215	printk(KERN_NOTICE "Power off indication received."
	216	" Sending SIGPWR to init...\n");
	217	else if (code == ENV_PWRDN_PEND)
	218	printk(KERN_CRIT "WARNING: Shutting down the system"
	219	" due to a critical environmental condition."
	220	" Sending SIGPWR to init...\n");
	221
fc626b27 GH	222	/* give a SIGPWR signal to init proc */
	223
	224	/* first find init's task */
	225	read_lock(&tasklist_lock);
	226	for_each_process(p) {
	227	if (p->pid == 1)
	228	break;
	229	}
28ff6b9b	230	if (p) {
fc626b27	231	force_sig(SIGPWR, p);
28ff6b9b AY	232	} else {
	233	printk(KERN_ERR "Failed to signal init!\n");
	234	snsc_shutting_down = 0; /* so can try again (?) */
fc626b27 GH	235	}
	236	read_unlock(&tasklist_lock);
	237	} else {
	238	/* print to system log */
	239	printk("%s\|$(0x%x)%s\n", severity, esp_code, desc);
	240	}
	241	}
	242
	243
	244	/*
	245	* scdrv_event
	246	*
	247	* Called as a tasklet when an event arrives from the L1. Read the event
	248	* from where it's temporarily stored in SAL and call scdrv_dispatch_event()
	249	* to send it on its way. Keep trying to read events until SAL indicates
	250	* that there are no more immediately available.
	251	*/
	252	void
	253	scdrv_event(unsigned long dummy)
	254	{
	255	int status;
	256	int len;
	257	unsigned long flags;
	258	struct subch_data_s *sd = event_sd;
	259
	260	/* anything to read? */
	261	len = CHUNKSIZE;
	262	spin_lock_irqsave(&sd->sd_rlock, flags);
	263	status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
	264	sd->sd_rb, &len);
	265
	266	while (!(status < 0)) {
	267	spin_unlock_irqrestore(&sd->sd_rlock, flags);
	268	scdrv_dispatch_event(sd->sd_rb, len);
	269	len = CHUNKSIZE;
	270	spin_lock_irqsave(&sd->sd_rlock, flags);
	271	status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
	272	sd->sd_rb, &len);
	273	}
	274	spin_unlock_irqrestore(&sd->sd_rlock, flags);
	275	}
	276
	277
	278	/*
	279	* scdrv_event_init
	280	*
	281	* Sets up a system controller subchannel to begin receiving event
	282	* messages. This is sort of a specialized version of scdrv_open()
	283	* in drivers/char/sn_sysctl.c.
	284	*/
	285	void
	286	scdrv_event_init(struct sysctl_data_s *scd)
	287	{
	288	int rv;
	289
40953ed8	290	event_sd = kzalloc(sizeof (struct subch_data_s), GFP_KERNEL);
fc626b27 GH	291	if (event_sd == NULL) {
	292	printk(KERN_WARNING "%s: couldn't allocate subchannel info"
	293	" for event monitoring\n", __FUNCTION__);
	294	return;
	295	}
	296
	297	/* initialize subch_data_s fields */
fc626b27 GH	298	event_sd->sd_nasid = scd->scd_nasid;
	299	spin_lock_init(&event_sd->sd_rlock);
	300
	301	/* ask the system controllers to send events to this node */
	302	event_sd->sd_subch = ia64_sn_sysctl_event_init(scd->scd_nasid);
	303
	304	if (event_sd->sd_subch < 0) {
	305	kfree(event_sd);
	306	printk(KERN_WARNING "%s: couldn't open event subchannel\n",
	307	__FUNCTION__);
	308	return;
	309	}
	310
	311	/* hook event subchannel up to the system controller interrupt */
	312	rv = request_irq(SGI_UART_VECTOR, scdrv_event_interrupt,
	313	SA_SHIRQ \| SA_INTERRUPT,
	314	"system controller events", event_sd);
	315	if (rv) {
	316	printk(KERN_WARNING "%s: irq request failed (%d)\n",
	317	__FUNCTION__, rv);
	318	ia64_sn_irtr_close(event_sd->sd_nasid, event_sd->sd_subch);
	319	kfree(event_sd);
	320	return;
	321	}
	322	}