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76#include <linux/fs.h>
77#include <linux/pagemap.h>
78#include <linux/slab.h>
79#include <linux/uaccess.h>
80#include <asm/io.h>
81#include "ibmasm.h"
82#include "remote.h"
83#include "dot_command.h"
84
85#define IBMASMFS_MAGIC 0x66726f67
86
87static LIST_HEAD(service_processors);
88
89static struct inode *ibmasmfs_make_inode(struct super_block *sb, int mode);
90static void ibmasmfs_create_files (struct super_block *sb);
91static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent);
92
93
94static struct dentry *ibmasmfs_mount(struct file_system_type *fst,
95 int flags, const char *name, void *data)
96{
97 return mount_single(fst, flags, data, ibmasmfs_fill_super);
98}
99
100static const struct super_operations ibmasmfs_s_ops = {
101 .statfs = simple_statfs,
102 .drop_inode = generic_delete_inode,
103};
104
105static const struct file_operations *ibmasmfs_dir_ops = &simple_dir_operations;
106
107static struct file_system_type ibmasmfs_type = {
108 .owner = THIS_MODULE,
109 .name = "ibmasmfs",
110 .mount = ibmasmfs_mount,
111 .kill_sb = kill_litter_super,
112};
113MODULE_ALIAS_FS("ibmasmfs");
114
115static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent)
116{
117 struct inode *root;
118
119 sb->s_blocksize = PAGE_SIZE;
120 sb->s_blocksize_bits = PAGE_SHIFT;
121 sb->s_magic = IBMASMFS_MAGIC;
122 sb->s_op = &ibmasmfs_s_ops;
123 sb->s_time_gran = 1;
124
125 root = ibmasmfs_make_inode (sb, S_IFDIR | 0500);
126 if (!root)
127 return -ENOMEM;
128
129 root->i_op = &simple_dir_inode_operations;
130 root->i_fop = ibmasmfs_dir_ops;
131
132 sb->s_root = d_make_root(root);
133 if (!sb->s_root)
134 return -ENOMEM;
135
136 ibmasmfs_create_files(sb);
137 return 0;
138}
139
140static struct inode *ibmasmfs_make_inode(struct super_block *sb, int mode)
141{
142 struct inode *ret = new_inode(sb);
143
144 if (ret) {
145 ret->i_ino = get_next_ino();
146 ret->i_mode = mode;
147 ret->i_atime = ret->i_mtime = ret->i_ctime = current_time(ret);
148 }
149 return ret;
150}
151
152static struct dentry *ibmasmfs_create_file(struct dentry *parent,
153 const char *name,
154 const struct file_operations *fops,
155 void *data,
156 int mode)
157{
158 struct dentry *dentry;
159 struct inode *inode;
160
161 dentry = d_alloc_name(parent, name);
162 if (!dentry)
163 return NULL;
164
165 inode = ibmasmfs_make_inode(parent->d_sb, S_IFREG | mode);
166 if (!inode) {
167 dput(dentry);
168 return NULL;
169 }
170
171 inode->i_fop = fops;
172 inode->i_private = data;
173
174 d_add(dentry, inode);
175 return dentry;
176}
177
178static struct dentry *ibmasmfs_create_dir(struct dentry *parent,
179 const char *name)
180{
181 struct dentry *dentry;
182 struct inode *inode;
183
184 dentry = d_alloc_name(parent, name);
185 if (!dentry)
186 return NULL;
187
188 inode = ibmasmfs_make_inode(parent->d_sb, S_IFDIR | 0500);
189 if (!inode) {
190 dput(dentry);
191 return NULL;
192 }
193
194 inode->i_op = &simple_dir_inode_operations;
195 inode->i_fop = ibmasmfs_dir_ops;
196
197 d_add(dentry, inode);
198 return dentry;
199}
200
201int ibmasmfs_register(void)
202{
203 return register_filesystem(&ibmasmfs_type);
204}
205
206void ibmasmfs_unregister(void)
207{
208 unregister_filesystem(&ibmasmfs_type);
209}
210
211void ibmasmfs_add_sp(struct service_processor *sp)
212{
213 list_add(&sp->node, &service_processors);
214}
215
216
217struct ibmasmfs_command_data {
218 struct service_processor *sp;
219 struct command *command;
220};
221
222
223struct ibmasmfs_event_data {
224 struct service_processor *sp;
225 struct event_reader reader;
226 int active;
227};
228
229
230struct ibmasmfs_heartbeat_data {
231 struct service_processor *sp;
232 struct reverse_heartbeat heartbeat;
233 int active;
234};
235
236static int command_file_open(struct inode *inode, struct file *file)
237{
238 struct ibmasmfs_command_data *command_data;
239
240 if (!inode->i_private)
241 return -ENODEV;
242
243 command_data = kmalloc(sizeof(struct ibmasmfs_command_data), GFP_KERNEL);
244 if (!command_data)
245 return -ENOMEM;
246
247 command_data->command = NULL;
248 command_data->sp = inode->i_private;
249 file->private_data = command_data;
250 return 0;
251}
252
253static int command_file_close(struct inode *inode, struct file *file)
254{
255 struct ibmasmfs_command_data *command_data = file->private_data;
256
257 if (command_data->command)
258 command_put(command_data->command);
259
260 kfree(command_data);
261 return 0;
262}
263
264static ssize_t command_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
265{
266 struct ibmasmfs_command_data *command_data = file->private_data;
267 struct command *cmd;
268 int len;
269 unsigned long flags;
270
271 if (*offset < 0)
272 return -EINVAL;
273 if (count == 0 || count > IBMASM_CMD_MAX_BUFFER_SIZE)
274 return 0;
275 if (*offset != 0)
276 return 0;
277
278 spin_lock_irqsave(&command_data->sp->lock, flags);
279 cmd = command_data->command;
280 if (cmd == NULL) {
281 spin_unlock_irqrestore(&command_data->sp->lock, flags);
282 return 0;
283 }
284 command_data->command = NULL;
285 spin_unlock_irqrestore(&command_data->sp->lock, flags);
286
287 if (cmd->status != IBMASM_CMD_COMPLETE) {
288 command_put(cmd);
289 return -EIO;
290 }
291 len = min(count, cmd->buffer_size);
292 if (copy_to_user(buf, cmd->buffer, len)) {
293 command_put(cmd);
294 return -EFAULT;
295 }
296 command_put(cmd);
297
298 return len;
299}
300
301static ssize_t command_file_write(struct file *file, const char __user *ubuff, size_t count, loff_t *offset)
302{
303 struct ibmasmfs_command_data *command_data = file->private_data;
304 struct command *cmd;
305 unsigned long flags;
306
307 if (*offset < 0)
308 return -EINVAL;
309 if (count == 0 || count > IBMASM_CMD_MAX_BUFFER_SIZE)
310 return 0;
311 if (*offset != 0)
312 return 0;
313
314
315 if (command_data->command)
316 return -EAGAIN;
317
318 cmd = ibmasm_new_command(command_data->sp, count);
319 if (!cmd)
320 return -ENOMEM;
321
322 if (copy_from_user(cmd->buffer, ubuff, count)) {
323 command_put(cmd);
324 return -EFAULT;
325 }
326
327 spin_lock_irqsave(&command_data->sp->lock, flags);
328 if (command_data->command) {
329 spin_unlock_irqrestore(&command_data->sp->lock, flags);
330 command_put(cmd);
331 return -EAGAIN;
332 }
333 command_data->command = cmd;
334 spin_unlock_irqrestore(&command_data->sp->lock, flags);
335
336 ibmasm_exec_command(command_data->sp, cmd);
337 ibmasm_wait_for_response(cmd, get_dot_command_timeout(cmd->buffer));
338
339 return count;
340}
341
342static int event_file_open(struct inode *inode, struct file *file)
343{
344 struct ibmasmfs_event_data *event_data;
345 struct service_processor *sp;
346
347 if (!inode->i_private)
348 return -ENODEV;
349
350 sp = inode->i_private;
351
352 event_data = kmalloc(sizeof(struct ibmasmfs_event_data), GFP_KERNEL);
353 if (!event_data)
354 return -ENOMEM;
355
356 ibmasm_event_reader_register(sp, &event_data->reader);
357
358 event_data->sp = sp;
359 event_data->active = 0;
360 file->private_data = event_data;
361 return 0;
362}
363
364static int event_file_close(struct inode *inode, struct file *file)
365{
366 struct ibmasmfs_event_data *event_data = file->private_data;
367
368 ibmasm_event_reader_unregister(event_data->sp, &event_data->reader);
369 kfree(event_data);
370 return 0;
371}
372
373static ssize_t event_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
374{
375 struct ibmasmfs_event_data *event_data = file->private_data;
376 struct event_reader *reader = &event_data->reader;
377 struct service_processor *sp = event_data->sp;
378 int ret;
379 unsigned long flags;
380
381 if (*offset < 0)
382 return -EINVAL;
383 if (count == 0 || count > IBMASM_EVENT_MAX_SIZE)
384 return 0;
385 if (*offset != 0)
386 return 0;
387
388 spin_lock_irqsave(&sp->lock, flags);
389 if (event_data->active) {
390 spin_unlock_irqrestore(&sp->lock, flags);
391 return -EBUSY;
392 }
393 event_data->active = 1;
394 spin_unlock_irqrestore(&sp->lock, flags);
395
396 ret = ibmasm_get_next_event(sp, reader);
397 if (ret <= 0)
398 goto out;
399
400 if (count < reader->data_size) {
401 ret = -EINVAL;
402 goto out;
403 }
404
405 if (copy_to_user(buf, reader->data, reader->data_size)) {
406 ret = -EFAULT;
407 goto out;
408 }
409 ret = reader->data_size;
410
411out:
412 event_data->active = 0;
413 return ret;
414}
415
416static ssize_t event_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
417{
418 struct ibmasmfs_event_data *event_data = file->private_data;
419
420 if (*offset < 0)
421 return -EINVAL;
422 if (count != 1)
423 return 0;
424 if (*offset != 0)
425 return 0;
426
427 ibmasm_cancel_next_event(&event_data->reader);
428 return 0;
429}
430
431static int r_heartbeat_file_open(struct inode *inode, struct file *file)
432{
433 struct ibmasmfs_heartbeat_data *rhbeat;
434
435 if (!inode->i_private)
436 return -ENODEV;
437
438 rhbeat = kmalloc(sizeof(struct ibmasmfs_heartbeat_data), GFP_KERNEL);
439 if (!rhbeat)
440 return -ENOMEM;
441
442 rhbeat->sp = inode->i_private;
443 rhbeat->active = 0;
444 ibmasm_init_reverse_heartbeat(rhbeat->sp, &rhbeat->heartbeat);
445 file->private_data = rhbeat;
446 return 0;
447}
448
449static int r_heartbeat_file_close(struct inode *inode, struct file *file)
450{
451 struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
452
453 kfree(rhbeat);
454 return 0;
455}
456
457static ssize_t r_heartbeat_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
458{
459 struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
460 unsigned long flags;
461 int result;
462
463 if (*offset < 0)
464 return -EINVAL;
465 if (count == 0 || count > 1024)
466 return 0;
467 if (*offset != 0)
468 return 0;
469
470
471 spin_lock_irqsave(&rhbeat->sp->lock, flags);
472 if (rhbeat->active) {
473 spin_unlock_irqrestore(&rhbeat->sp->lock, flags);
474 return -EBUSY;
475 }
476 rhbeat->active = 1;
477 spin_unlock_irqrestore(&rhbeat->sp->lock, flags);
478
479 result = ibmasm_start_reverse_heartbeat(rhbeat->sp, &rhbeat->heartbeat);
480 rhbeat->active = 0;
481
482 return result;
483}
484
485static ssize_t r_heartbeat_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
486{
487 struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
488
489 if (*offset < 0)
490 return -EINVAL;
491 if (count != 1)
492 return 0;
493 if (*offset != 0)
494 return 0;
495
496 if (rhbeat->active)
497 ibmasm_stop_reverse_heartbeat(&rhbeat->heartbeat);
498
499 return 1;
500}
501
502static int remote_settings_file_close(struct inode *inode, struct file *file)
503{
504 return 0;
505}
506
507static ssize_t remote_settings_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
508{
509 void __iomem *address = (void __iomem *)file->private_data;
510 unsigned char *page;
511 int retval;
512 int len = 0;
513 unsigned int value;
514
515 if (*offset < 0)
516 return -EINVAL;
517 if (count == 0 || count > 1024)
518 return 0;
519 if (*offset != 0)
520 return 0;
521
522 page = (unsigned char *)__get_free_page(GFP_KERNEL);
523 if (!page)
524 return -ENOMEM;
525
526 value = readl(address);
527 len = sprintf(page, "%d\n", value);
528
529 if (copy_to_user(buf, page, len)) {
530 retval = -EFAULT;
531 goto exit;
532 }
533 *offset += len;
534 retval = len;
535
536exit:
537 free_page((unsigned long)page);
538 return retval;
539}
540
541static ssize_t remote_settings_file_write(struct file *file, const char __user *ubuff, size_t count, loff_t *offset)
542{
543 void __iomem *address = (void __iomem *)file->private_data;
544 char *buff;
545 unsigned int value;
546
547 if (*offset < 0)
548 return -EINVAL;
549 if (count == 0 || count > 1024)
550 return 0;
551 if (*offset != 0)
552 return 0;
553
554 buff = kzalloc (count + 1, GFP_KERNEL);
555 if (!buff)
556 return -ENOMEM;
557
558
559 if (copy_from_user(buff, ubuff, count)) {
560 kfree(buff);
561 return -EFAULT;
562 }
563
564 value = simple_strtoul(buff, NULL, 10);
565 writel(value, address);
566 kfree(buff);
567
568 return count;
569}
570
571static const struct file_operations command_fops = {
572 .open = command_file_open,
573 .release = command_file_close,
574 .read = command_file_read,
575 .write = command_file_write,
576 .llseek = generic_file_llseek,
577};
578
579static const struct file_operations event_fops = {
580 .open = event_file_open,
581 .release = event_file_close,
582 .read = event_file_read,
583 .write = event_file_write,
584 .llseek = generic_file_llseek,
585};
586
587static const struct file_operations r_heartbeat_fops = {
588 .open = r_heartbeat_file_open,
589 .release = r_heartbeat_file_close,
590 .read = r_heartbeat_file_read,
591 .write = r_heartbeat_file_write,
592 .llseek = generic_file_llseek,
593};
594
595static const struct file_operations remote_settings_fops = {
596 .open = simple_open,
597 .release = remote_settings_file_close,
598 .read = remote_settings_file_read,
599 .write = remote_settings_file_write,
600 .llseek = generic_file_llseek,
601};
602
603
604static void ibmasmfs_create_files (struct super_block *sb)
605{
606 struct list_head *entry;
607 struct service_processor *sp;
608
609 list_for_each(entry, &service_processors) {
610 struct dentry *dir;
611 struct dentry *remote_dir;
612 sp = list_entry(entry, struct service_processor, node);
613 dir = ibmasmfs_create_dir(sb->s_root, sp->dirname);
614 if (!dir)
615 continue;
616
617 ibmasmfs_create_file(dir, "command", &command_fops, sp, S_IRUSR|S_IWUSR);
618 ibmasmfs_create_file(dir, "event", &event_fops, sp, S_IRUSR|S_IWUSR);
619 ibmasmfs_create_file(dir, "reverse_heartbeat", &r_heartbeat_fops, sp, S_IRUSR|S_IWUSR);
620
621 remote_dir = ibmasmfs_create_dir(dir, "remote_video");
622 if (!remote_dir)
623 continue;
624
625 ibmasmfs_create_file(remote_dir, "width", &remote_settings_fops, (void *)display_width(sp), S_IRUSR|S_IWUSR);
626 ibmasmfs_create_file(remote_dir, "height", &remote_settings_fops, (void *)display_height(sp), S_IRUSR|S_IWUSR);
627 ibmasmfs_create_file(remote_dir, "depth", &remote_settings_fops, (void *)display_depth(sp), S_IRUSR|S_IWUSR);
628 }
629}
630
