Commit | Line | Data |
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1da177e4 LT |
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 | * | |
40953ed8 | 8 | * Copyright (C) 2004, 2006 Silicon Graphics, Inc. All rights reserved. |
1da177e4 LT |
9 | */ |
10 | ||
11 | /* | |
12 | * System controller communication driver | |
13 | * | |
14 | * This driver allows a user process to communicate with the system | |
15 | * controller (a.k.a. "IRouter") network in an SGI SN system. | |
16 | */ | |
17 | ||
18 | #include <linux/interrupt.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/poll.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/slab.h> | |
24 | #include <asm/sn/io.h> | |
25 | #include <asm/sn/sn_sal.h> | |
26 | #include <asm/sn/module.h> | |
27 | #include <asm/sn/geo.h> | |
28 | #include <asm/sn/nodepda.h> | |
29 | #include "snsc.h" | |
30 | ||
31 | #define SYSCTL_BASENAME "snsc" | |
32 | ||
33 | #define SCDRV_BUFSZ 2048 | |
34 | #define SCDRV_TIMEOUT 1000 | |
35 | ||
36 | static irqreturn_t | |
7d12e780 | 37 | scdrv_interrupt(int irq, void *subch_data) |
1da177e4 LT |
38 | { |
39 | struct subch_data_s *sd = subch_data; | |
40 | unsigned long flags; | |
41 | int status; | |
42 | ||
43 | spin_lock_irqsave(&sd->sd_rlock, flags); | |
44 | spin_lock(&sd->sd_wlock); | |
45 | status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch); | |
46 | ||
47 | if (status > 0) { | |
48 | if (status & SAL_IROUTER_INTR_RECV) { | |
49 | wake_up(&sd->sd_rq); | |
50 | } | |
51 | if (status & SAL_IROUTER_INTR_XMIT) { | |
52 | ia64_sn_irtr_intr_disable | |
53 | (sd->sd_nasid, sd->sd_subch, | |
54 | SAL_IROUTER_INTR_XMIT); | |
55 | wake_up(&sd->sd_wq); | |
56 | } | |
57 | } | |
58 | spin_unlock(&sd->sd_wlock); | |
59 | spin_unlock_irqrestore(&sd->sd_rlock, flags); | |
60 | return IRQ_HANDLED; | |
61 | } | |
62 | ||
63 | /* | |
64 | * scdrv_open | |
65 | * | |
66 | * Reserve a subchannel for system controller communication. | |
67 | */ | |
68 | ||
69 | static int | |
70 | scdrv_open(struct inode *inode, struct file *file) | |
71 | { | |
72 | struct sysctl_data_s *scd; | |
73 | struct subch_data_s *sd; | |
74 | int rv; | |
75 | ||
76 | /* look up device info for this device file */ | |
77 | scd = container_of(inode->i_cdev, struct sysctl_data_s, scd_cdev); | |
78 | ||
79 | /* allocate memory for subchannel data */ | |
40953ed8 | 80 | sd = kzalloc(sizeof (struct subch_data_s), GFP_KERNEL); |
1da177e4 LT |
81 | if (sd == NULL) { |
82 | printk("%s: couldn't allocate subchannel data\n", | |
83 | __FUNCTION__); | |
84 | return -ENOMEM; | |
85 | } | |
86 | ||
87 | /* initialize subch_data_s fields */ | |
1da177e4 LT |
88 | sd->sd_nasid = scd->scd_nasid; |
89 | sd->sd_subch = ia64_sn_irtr_open(scd->scd_nasid); | |
90 | ||
91 | if (sd->sd_subch < 0) { | |
92 | kfree(sd); | |
93 | printk("%s: couldn't allocate subchannel\n", __FUNCTION__); | |
94 | return -EBUSY; | |
95 | } | |
96 | ||
97 | spin_lock_init(&sd->sd_rlock); | |
98 | spin_lock_init(&sd->sd_wlock); | |
99 | init_waitqueue_head(&sd->sd_rq); | |
100 | init_waitqueue_head(&sd->sd_wq); | |
101 | sema_init(&sd->sd_rbs, 1); | |
102 | sema_init(&sd->sd_wbs, 1); | |
103 | ||
104 | file->private_data = sd; | |
105 | ||
106 | /* hook this subchannel up to the system controller interrupt */ | |
107 | rv = request_irq(SGI_UART_VECTOR, scdrv_interrupt, | |
0f2ed4c6 | 108 | IRQF_SHARED | IRQF_DISABLED, |
1da177e4 LT |
109 | SYSCTL_BASENAME, sd); |
110 | if (rv) { | |
111 | ia64_sn_irtr_close(sd->sd_nasid, sd->sd_subch); | |
112 | kfree(sd); | |
113 | printk("%s: irq request failed (%d)\n", __FUNCTION__, rv); | |
114 | return -EBUSY; | |
115 | } | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | /* | |
121 | * scdrv_release | |
122 | * | |
123 | * Release a previously-reserved subchannel. | |
124 | */ | |
125 | ||
126 | static int | |
127 | scdrv_release(struct inode *inode, struct file *file) | |
128 | { | |
129 | struct subch_data_s *sd = (struct subch_data_s *) file->private_data; | |
130 | int rv; | |
131 | ||
132 | /* free the interrupt */ | |
133 | free_irq(SGI_UART_VECTOR, sd); | |
134 | ||
135 | /* ask SAL to close the subchannel */ | |
136 | rv = ia64_sn_irtr_close(sd->sd_nasid, sd->sd_subch); | |
137 | ||
138 | kfree(sd); | |
139 | return rv; | |
140 | } | |
141 | ||
142 | /* | |
143 | * scdrv_read | |
144 | * | |
145 | * Called to read bytes from the open IRouter pipe. | |
146 | * | |
147 | */ | |
148 | ||
149 | static inline int | |
150 | read_status_check(struct subch_data_s *sd, int *len) | |
151 | { | |
152 | return ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch, sd->sd_rb, len); | |
153 | } | |
154 | ||
155 | static ssize_t | |
156 | scdrv_read(struct file *file, char __user *buf, size_t count, loff_t *f_pos) | |
157 | { | |
158 | int status; | |
159 | int len; | |
160 | unsigned long flags; | |
161 | struct subch_data_s *sd = (struct subch_data_s *) file->private_data; | |
162 | ||
163 | /* try to get control of the read buffer */ | |
164 | if (down_trylock(&sd->sd_rbs)) { | |
165 | /* somebody else has it now; | |
166 | * if we're non-blocking, then exit... | |
167 | */ | |
168 | if (file->f_flags & O_NONBLOCK) { | |
169 | return -EAGAIN; | |
170 | } | |
171 | /* ...or if we want to block, then do so here */ | |
172 | if (down_interruptible(&sd->sd_rbs)) { | |
173 | /* something went wrong with wait */ | |
174 | return -ERESTARTSYS; | |
175 | } | |
176 | } | |
177 | ||
178 | /* anything to read? */ | |
179 | len = CHUNKSIZE; | |
180 | spin_lock_irqsave(&sd->sd_rlock, flags); | |
181 | status = read_status_check(sd, &len); | |
182 | ||
183 | /* if not, and we're blocking I/O, loop */ | |
184 | while (status < 0) { | |
185 | DECLARE_WAITQUEUE(wait, current); | |
186 | ||
187 | if (file->f_flags & O_NONBLOCK) { | |
188 | spin_unlock_irqrestore(&sd->sd_rlock, flags); | |
189 | up(&sd->sd_rbs); | |
190 | return -EAGAIN; | |
191 | } | |
192 | ||
193 | len = CHUNKSIZE; | |
194 | set_current_state(TASK_INTERRUPTIBLE); | |
195 | add_wait_queue(&sd->sd_rq, &wait); | |
196 | spin_unlock_irqrestore(&sd->sd_rlock, flags); | |
197 | ||
198 | schedule_timeout(SCDRV_TIMEOUT); | |
199 | ||
200 | remove_wait_queue(&sd->sd_rq, &wait); | |
201 | if (signal_pending(current)) { | |
202 | /* wait was interrupted */ | |
203 | up(&sd->sd_rbs); | |
204 | return -ERESTARTSYS; | |
205 | } | |
206 | ||
207 | spin_lock_irqsave(&sd->sd_rlock, flags); | |
208 | status = read_status_check(sd, &len); | |
209 | } | |
210 | spin_unlock_irqrestore(&sd->sd_rlock, flags); | |
211 | ||
212 | if (len > 0) { | |
213 | /* we read something in the last read_status_check(); copy | |
214 | * it out to user space | |
215 | */ | |
216 | if (count < len) { | |
217 | pr_debug("%s: only accepting %d of %d bytes\n", | |
218 | __FUNCTION__, (int) count, len); | |
219 | } | |
220 | len = min((int) count, len); | |
221 | if (copy_to_user(buf, sd->sd_rb, len)) | |
222 | len = -EFAULT; | |
223 | } | |
224 | ||
225 | /* release the read buffer and wake anyone who might be | |
226 | * waiting for it | |
227 | */ | |
228 | up(&sd->sd_rbs); | |
229 | ||
230 | /* return the number of characters read in */ | |
231 | return len; | |
232 | } | |
233 | ||
234 | /* | |
235 | * scdrv_write | |
236 | * | |
237 | * Writes a chunk of an IRouter packet (or other system controller data) | |
238 | * to the system controller. | |
239 | * | |
240 | */ | |
241 | static inline int | |
242 | write_status_check(struct subch_data_s *sd, int count) | |
243 | { | |
244 | return ia64_sn_irtr_send(sd->sd_nasid, sd->sd_subch, sd->sd_wb, count); | |
245 | } | |
246 | ||
247 | static ssize_t | |
248 | scdrv_write(struct file *file, const char __user *buf, | |
249 | size_t count, loff_t *f_pos) | |
250 | { | |
251 | unsigned long flags; | |
252 | int status; | |
253 | struct subch_data_s *sd = (struct subch_data_s *) file->private_data; | |
254 | ||
255 | /* try to get control of the write buffer */ | |
256 | if (down_trylock(&sd->sd_wbs)) { | |
257 | /* somebody else has it now; | |
258 | * if we're non-blocking, then exit... | |
259 | */ | |
260 | if (file->f_flags & O_NONBLOCK) { | |
261 | return -EAGAIN; | |
262 | } | |
263 | /* ...or if we want to block, then do so here */ | |
264 | if (down_interruptible(&sd->sd_wbs)) { | |
265 | /* something went wrong with wait */ | |
266 | return -ERESTARTSYS; | |
267 | } | |
268 | } | |
269 | ||
270 | count = min((int) count, CHUNKSIZE); | |
271 | if (copy_from_user(sd->sd_wb, buf, count)) { | |
272 | up(&sd->sd_wbs); | |
273 | return -EFAULT; | |
274 | } | |
275 | ||
276 | /* try to send the buffer */ | |
277 | spin_lock_irqsave(&sd->sd_wlock, flags); | |
278 | status = write_status_check(sd, count); | |
279 | ||
280 | /* if we failed, and we want to block, then loop */ | |
281 | while (status <= 0) { | |
282 | DECLARE_WAITQUEUE(wait, current); | |
283 | ||
284 | if (file->f_flags & O_NONBLOCK) { | |
285 | spin_unlock(&sd->sd_wlock); | |
286 | up(&sd->sd_wbs); | |
287 | return -EAGAIN; | |
288 | } | |
289 | ||
290 | set_current_state(TASK_INTERRUPTIBLE); | |
291 | add_wait_queue(&sd->sd_wq, &wait); | |
292 | spin_unlock_irqrestore(&sd->sd_wlock, flags); | |
293 | ||
294 | schedule_timeout(SCDRV_TIMEOUT); | |
295 | ||
296 | remove_wait_queue(&sd->sd_wq, &wait); | |
297 | if (signal_pending(current)) { | |
298 | /* wait was interrupted */ | |
299 | up(&sd->sd_wbs); | |
300 | return -ERESTARTSYS; | |
301 | } | |
302 | ||
303 | spin_lock_irqsave(&sd->sd_wlock, flags); | |
304 | status = write_status_check(sd, count); | |
305 | } | |
306 | spin_unlock_irqrestore(&sd->sd_wlock, flags); | |
307 | ||
308 | /* release the write buffer and wake anyone who's waiting for it */ | |
309 | up(&sd->sd_wbs); | |
310 | ||
311 | /* return the number of characters accepted (should be the complete | |
312 | * "chunk" as requested) | |
313 | */ | |
314 | if ((status >= 0) && (status < count)) { | |
315 | pr_debug("Didn't accept the full chunk; %d of %d\n", | |
316 | status, (int) count); | |
317 | } | |
318 | return status; | |
319 | } | |
320 | ||
321 | static unsigned int | |
322 | scdrv_poll(struct file *file, struct poll_table_struct *wait) | |
323 | { | |
324 | unsigned int mask = 0; | |
325 | int status = 0; | |
326 | struct subch_data_s *sd = (struct subch_data_s *) file->private_data; | |
327 | unsigned long flags; | |
328 | ||
329 | poll_wait(file, &sd->sd_rq, wait); | |
330 | poll_wait(file, &sd->sd_wq, wait); | |
331 | ||
332 | spin_lock_irqsave(&sd->sd_rlock, flags); | |
333 | spin_lock(&sd->sd_wlock); | |
334 | status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch); | |
335 | spin_unlock(&sd->sd_wlock); | |
336 | spin_unlock_irqrestore(&sd->sd_rlock, flags); | |
337 | ||
338 | if (status > 0) { | |
339 | if (status & SAL_IROUTER_INTR_RECV) { | |
340 | mask |= POLLIN | POLLRDNORM; | |
341 | } | |
342 | if (status & SAL_IROUTER_INTR_XMIT) { | |
343 | mask |= POLLOUT | POLLWRNORM; | |
344 | } | |
345 | } | |
346 | ||
347 | return mask; | |
348 | } | |
349 | ||
62322d25 | 350 | static const struct file_operations scdrv_fops = { |
1da177e4 LT |
351 | .owner = THIS_MODULE, |
352 | .read = scdrv_read, | |
353 | .write = scdrv_write, | |
354 | .poll = scdrv_poll, | |
355 | .open = scdrv_open, | |
356 | .release = scdrv_release, | |
357 | }; | |
358 | ||
ca8eca68 | 359 | static struct class *snsc_class; |
360 | ||
1da177e4 LT |
361 | /* |
362 | * scdrv_init | |
363 | * | |
364 | * Called at boot time to initialize the system controller communication | |
365 | * facility. | |
366 | */ | |
367 | int __init | |
368 | scdrv_init(void) | |
369 | { | |
370 | geoid_t geoid; | |
371 | cnodeid_t cnode; | |
372 | char devname[32]; | |
373 | char *devnamep; | |
374 | struct sysctl_data_s *scd; | |
375 | void *salbuf; | |
1da177e4 | 376 | dev_t first_dev, dev; |
c7c17423 GE |
377 | nasid_t event_nasid; |
378 | ||
379 | if (!ia64_platform_is("sn2")) | |
380 | return -ENODEV; | |
381 | ||
382 | event_nasid = ia64_sn_get_console_nasid(); | |
1da177e4 | 383 | |
24ee0a6d | 384 | if (alloc_chrdev_region(&first_dev, 0, num_cnodes, |
1da177e4 LT |
385 | SYSCTL_BASENAME) < 0) { |
386 | printk("%s: failed to register SN system controller device\n", | |
387 | __FUNCTION__); | |
388 | return -ENODEV; | |
389 | } | |
ca8eca68 | 390 | snsc_class = class_create(THIS_MODULE, SYSCTL_BASENAME); |
1da177e4 | 391 | |
24ee0a6d | 392 | for (cnode = 0; cnode < num_cnodes; cnode++) { |
1da177e4 LT |
393 | geoid = cnodeid_get_geoid(cnode); |
394 | devnamep = devname; | |
395 | format_module_id(devnamep, geo_module(geoid), | |
396 | MODULE_FORMAT_BRIEF); | |
397 | devnamep = devname + strlen(devname); | |
8c4335a8 | 398 | sprintf(devnamep, "^%d#%d", geo_slot(geoid), |
399 | geo_slab(geoid)); | |
1da177e4 LT |
400 | |
401 | /* allocate sysctl device data */ | |
40953ed8 | 402 | scd = kzalloc(sizeof (struct sysctl_data_s), |
1da177e4 LT |
403 | GFP_KERNEL); |
404 | if (!scd) { | |
405 | printk("%s: failed to allocate device info" | |
406 | "for %s/%s\n", __FUNCTION__, | |
407 | SYSCTL_BASENAME, devname); | |
408 | continue; | |
409 | } | |
1da177e4 LT |
410 | |
411 | /* initialize sysctl device data fields */ | |
412 | scd->scd_nasid = cnodeid_to_nasid(cnode); | |
413 | if (!(salbuf = kmalloc(SCDRV_BUFSZ, GFP_KERNEL))) { | |
414 | printk("%s: failed to allocate driver buffer" | |
415 | "(%s%s)\n", __FUNCTION__, | |
416 | SYSCTL_BASENAME, devname); | |
417 | kfree(scd); | |
418 | continue; | |
419 | } | |
420 | ||
421 | if (ia64_sn_irtr_init(scd->scd_nasid, salbuf, | |
422 | SCDRV_BUFSZ) < 0) { | |
423 | printk | |
424 | ("%s: failed to initialize SAL for" | |
425 | " system controller communication" | |
426 | " (%s/%s): outdated PROM?\n", | |
427 | __FUNCTION__, SYSCTL_BASENAME, devname); | |
428 | kfree(scd); | |
429 | kfree(salbuf); | |
430 | continue; | |
431 | } | |
432 | ||
433 | dev = first_dev + cnode; | |
434 | cdev_init(&scd->scd_cdev, &scdrv_fops); | |
435 | if (cdev_add(&scd->scd_cdev, dev, 1)) { | |
436 | printk("%s: failed to register system" | |
437 | " controller device (%s%s)\n", | |
438 | __FUNCTION__, SYSCTL_BASENAME, devname); | |
439 | kfree(scd); | |
440 | kfree(salbuf); | |
441 | continue; | |
442 | } | |
443 | ||
53f46542 | 444 | class_device_create(snsc_class, NULL, dev, NULL, |
1da177e4 LT |
445 | "%s", devname); |
446 | ||
447 | ia64_sn_irtr_intr_enable(scd->scd_nasid, | |
448 | 0 /*ignored */ , | |
449 | SAL_IROUTER_INTR_RECV); | |
67639deb GH |
450 | |
451 | /* on the console nasid, prepare to receive | |
452 | * system controller environmental events | |
453 | */ | |
454 | if(scd->scd_nasid == event_nasid) { | |
455 | scdrv_event_init(scd); | |
456 | } | |
1da177e4 LT |
457 | } |
458 | return 0; | |
459 | } | |
460 | ||
461 | module_init(scdrv_init); |