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