blob: baaa365285fa973776beddcb0ae5c09389ffbe65 [file] [log] [blame]
Greg Howardfc626b22005-04-25 13:29:46 -07001/*
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 *
8 * Copyright (C) 2004 Silicon Graphics, Inc. All rights reserved.
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>
Greg Howard1a402aa2005-08-15 13:00:00 -070022#include <asm/unaligned.h>
Greg Howardfc626b22005-04-25 13:29:46 -070023#include "snsc.h"
24
25static struct subch_data_s *event_sd;
26
27void scdrv_event(unsigned long);
28DECLARE_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 */
38static irqreturn_t
39scdrv_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 */
62static int
63scdrv_parse_event(char *event, int *src, int *code, int *esp_code, char *desc)
64{
65 char *desc_end;
Greg Howard1a402aa2005-08-15 13:00:00 -070066 __be32 from_buf;
Greg Howardfc626b22005-04-25 13:29:46 -070067
68 /* record event source address */
Greg Howard1a402aa2005-08-15 13:00:00 -070069 from_buf = get_unaligned((__be32 *)event);
70 *src = be32_to_cpup(&from_buf);
Greg Howardfc626b22005-04-25 13:29:46 -070071 event += 4; /* move on to event code */
72
73 /* record the system controller's event code */
Greg Howard1a402aa2005-08-15 13:00:00 -070074 from_buf = get_unaligned((__be32 *)event);
75 *code = be32_to_cpup(&from_buf);
Greg Howardfc626b22005-04-25 13:29:46 -070076 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 }
Greg Howard1a402aa2005-08-15 13:00:00 -070089 from_buf = get_unaligned((__be32 *)event);
90 *esp_code = be32_to_cpup(&from_buf);
Greg Howardfc626b22005-04-25 13:29:46 -070091 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 */
119static char *
120scdrv_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 */
187static void
188scdrv_dispatch_event(char *event, int len)
189{
190 int code, esp_code, src;
191 char desc[CHUNKSIZE];
192 char *severity;
193
194 if (scdrv_parse_event(event, &src, &code, &esp_code, desc) < 0) {
195 /* ignore uninterpretible event */
196 return;
197 }
198
199 /* how urgent is the message? */
200 severity = scdrv_event_severity(code);
201
202 if ((code & EV_CLASS_MASK) == EV_CLASS_PWRD_NOTIFY) {
203 struct task_struct *p;
204
205 /* give a SIGPWR signal to init proc */
206
207 /* first find init's task */
208 read_lock(&tasklist_lock);
209 for_each_process(p) {
210 if (p->pid == 1)
211 break;
212 }
213 if (p) { /* we found init's task */
214 printk(KERN_EMERG "Power off indication received. Initiating power fail sequence...\n");
215 force_sig(SIGPWR, p);
216 } else { /* failed to find init's task - just give message(s) */
217 printk(KERN_WARNING "Failed to find init proc to handle power off!\n");
218 printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
219 }
220 read_unlock(&tasklist_lock);
221 } else {
222 /* print to system log */
223 printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
224 }
225}
226
227
228/*
229 * scdrv_event
230 *
231 * Called as a tasklet when an event arrives from the L1. Read the event
232 * from where it's temporarily stored in SAL and call scdrv_dispatch_event()
233 * to send it on its way. Keep trying to read events until SAL indicates
234 * that there are no more immediately available.
235 */
236void
237scdrv_event(unsigned long dummy)
238{
239 int status;
240 int len;
241 unsigned long flags;
242 struct subch_data_s *sd = event_sd;
243
244 /* anything to read? */
245 len = CHUNKSIZE;
246 spin_lock_irqsave(&sd->sd_rlock, flags);
247 status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
248 sd->sd_rb, &len);
249
250 while (!(status < 0)) {
251 spin_unlock_irqrestore(&sd->sd_rlock, flags);
252 scdrv_dispatch_event(sd->sd_rb, len);
253 len = CHUNKSIZE;
254 spin_lock_irqsave(&sd->sd_rlock, flags);
255 status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
256 sd->sd_rb, &len);
257 }
258 spin_unlock_irqrestore(&sd->sd_rlock, flags);
259}
260
261
262/*
263 * scdrv_event_init
264 *
265 * Sets up a system controller subchannel to begin receiving event
266 * messages. This is sort of a specialized version of scdrv_open()
267 * in drivers/char/sn_sysctl.c.
268 */
269void
270scdrv_event_init(struct sysctl_data_s *scd)
271{
272 int rv;
273
274 event_sd = kmalloc(sizeof (struct subch_data_s), GFP_KERNEL);
275 if (event_sd == NULL) {
276 printk(KERN_WARNING "%s: couldn't allocate subchannel info"
277 " for event monitoring\n", __FUNCTION__);
278 return;
279 }
280
281 /* initialize subch_data_s fields */
282 memset(event_sd, 0, sizeof (struct subch_data_s));
283 event_sd->sd_nasid = scd->scd_nasid;
284 spin_lock_init(&event_sd->sd_rlock);
285
286 /* ask the system controllers to send events to this node */
287 event_sd->sd_subch = ia64_sn_sysctl_event_init(scd->scd_nasid);
288
289 if (event_sd->sd_subch < 0) {
290 kfree(event_sd);
291 printk(KERN_WARNING "%s: couldn't open event subchannel\n",
292 __FUNCTION__);
293 return;
294 }
295
296 /* hook event subchannel up to the system controller interrupt */
297 rv = request_irq(SGI_UART_VECTOR, scdrv_event_interrupt,
298 SA_SHIRQ | SA_INTERRUPT,
299 "system controller events", event_sd);
300 if (rv) {
301 printk(KERN_WARNING "%s: irq request failed (%d)\n",
302 __FUNCTION__, rv);
303 ia64_sn_irtr_close(event_sd->sd_nasid, event_sd->sd_subch);
304 kfree(event_sd);
305 return;
306 }
307}
308
309