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   1 /*
   2  * IBM ASM Service Processor Device Driver
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  *
  18  * Copyright (C) IBM Corporation, 2004
  19  *
  20  * Author: Max Asböck <amax@us.ibm.com>
  21  *
  22  */
  23
  24 /*
  25  * Parts of this code are based on an article by Jonathan Corbet
  26  * that appeared in Linux Weekly News.
  27  */
  28
  29
  30 /*
  31  * The IBMASM file virtual filesystem. It creates the following hierarchy
  32  * dymamically when mounted from user space:
  33  *
  34  *    /ibmasm
  35  *    |-- 0
  36  *    |   |-- command
  37  *    |   |-- event
  38  *    |   |-- reverse_heartbeat
  39  *    |   `-- remote_video
  40  *    |       |-- connected
  41  *    |       |-- depth
  42  *    |       |-- events
  43  *    |       |-- height
  44  *    |       `-- width
  45  *    .
  46  *    .
  47  *    .
  48  *    `-- n
  49  *        |-- command
  50  *        |-- event
  51  *        |-- reverse_heartbeat
  52  *        `-- remote_video
  53  *            |-- connected
  54  *            |-- depth
  55  *            |-- events
  56  *            |-- height
  57  *            `-- width
  58  *
  59  * For each service processor the following files are created:
  60  *
  61  * command: execute dot commands
  62  *      write: execute a dot command on the service processor
  63  *      read: return the result of a previously executed dot command
  64  *
  65  * events: listen for service processor events
  66  *      read: sleep (interruptible) until an event occurs
  67  *      write: wakeup sleeping event listener
  68  *
  69  * reverse_heartbeat: send a heartbeat to the service processor
  70  *      read: sleep (interruptible) until the reverse heartbeat fails
  71  *      write: wakeup sleeping heartbeat listener
  72  *
  73  * remote_video/width
  74  * remote_video/height
  75  * remote_video/width: control remote display settings
  76  *      write: set value
  77  *      read: read value
  78  *
  79  * remote_video/connected
  80  *      read: return "1" if web browser VNC java applet is connected,
  81  *              "0" otherwise
  82  *
  83  * remote_video/events
  84  *      read: sleep until a remote mouse or keyboard event occurs, then return
  85  *              then event.
  86  */
  87
  88 #include <linux/fs.h>
  89 #include <linux/pagemap.h>
  90 #include <asm/uaccess.h>
  91 #include <asm/io.h>
  92 #include "ibmasm.h"
  93 #include "remote.h"
  94 #include "dot_command.h"
  95
  96 #define IBMASMFS_MAGIC 0x66726f67
  97
  98 static LIST_HEAD(service_processors);
  99
 100 static struct inode *ibmasmfs_make_inode(struct super_block *sb, int mode);
 101 static void ibmasmfs_create_files (struct super_block *sb, struct dentry *root);
 102 static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent);
 103
 104
 105 static struct super_block *ibmasmfs_get_super(struct file_system_type *fst,
 106                         int flags, const char *name, void *data)
 107 {
 108         return get_sb_single(fst, flags, data, ibmasmfs_fill_super);
 109 }
 110
 111 static struct super_operations ibmasmfs_s_ops = {
 112         .statfs         = simple_statfs,
 113         .drop_inode     = generic_delete_inode,
 114 };
 115
 116 static struct file_operations *ibmasmfs_dir_ops = &simple_dir_operations;
 117
 118 static struct file_system_type ibmasmfs_type = {
 119         .owner          = THIS_MODULE,
 120         .name           = "ibmasmfs",
 121         .get_sb         = ibmasmfs_get_super,
 122         .kill_sb        = kill_litter_super,
 123 };
 124
 125 static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent)
 126 {
 127         struct inode *root;
 128         struct dentry *root_dentry;
 129
 130         sb->s_blocksize = PAGE_CACHE_SIZE;
 131         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
 132         sb->s_magic = IBMASMFS_MAGIC;
 133         sb->s_op = &ibmasmfs_s_ops;
 134         sb->s_time_gran = 1;
 135
 136         root = ibmasmfs_make_inode (sb, S_IFDIR | 0500);
 137         if (!root)
 138                 return -ENOMEM;
 139
 140         root->i_op = &simple_dir_inode_operations;
 141         root->i_fop = ibmasmfs_dir_ops;
 142
 143         root_dentry = d_alloc_root(root);
 144         if (!root_dentry) {
 145                 iput(root);
 146                 return -ENOMEM;
 147         }
 148         sb->s_root = root_dentry;
 149
 150         ibmasmfs_create_files(sb, root_dentry);
 151         return 0;
 152 }
 153
 154 static struct inode *ibmasmfs_make_inode(struct super_block *sb, int mode)
 155 {
 156         struct inode *ret = new_inode(sb);
 157
 158         if (ret) {
 159                 ret->i_mode = mode;
 160                 ret->i_uid = ret->i_gid = 0;
 161                 ret->i_blksize = PAGE_CACHE_SIZE;
 162                 ret->i_blocks = 0;
 163                 ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
 164         }
 165         return ret;
 166 }
 167
 168 static struct dentry *ibmasmfs_create_file (struct super_block *sb,
 169                         struct dentry *parent,
 170                         const char *name,
 171                         struct file_operations *fops,
 172                         void *data,
 173                         int mode)
 174 {
 175         struct dentry *dentry;
 176         struct inode *inode;
 177
 178         dentry = d_alloc_name(parent, name);
 179         if (!dentry)
 180                 return NULL;
 181
 182         inode = ibmasmfs_make_inode(sb, S_IFREG | mode);
 183         if (!inode) {
 184                 dput(dentry);
 185                 return NULL;
 186         }
 187
 188         inode->i_fop = fops;
 189         inode->u.generic_ip = data;
 190
 191         d_add(dentry, inode);
 192         return dentry;
 193 }
 194
 195 static struct dentry *ibmasmfs_create_dir (struct super_block *sb,
 196                                 struct dentry *parent,
 197                                 const char *name)
 198 {
 199         struct dentry *dentry;
 200         struct inode *inode;
 201
 202         dentry = d_alloc_name(parent, name);
 203         if (!dentry)
 204                 return NULL;
 205
 206         inode = ibmasmfs_make_inode(sb, S_IFDIR | 0500);
 207         if (!inode) {
 208                 dput(dentry);
 209                 return NULL;
 210         }
 211
 212         inode->i_op = &simple_dir_inode_operations;
 213         inode->i_fop = ibmasmfs_dir_ops;
 214
 215         d_add(dentry, inode);
 216         return dentry;
 217 }
 218
 219 int ibmasmfs_register(void)
 220 {
 221         return register_filesystem(&ibmasmfs_type);
 222 }
 223
 224 void ibmasmfs_unregister(void)
 225 {
 226         unregister_filesystem(&ibmasmfs_type);
 227 }
 228
 229 void ibmasmfs_add_sp(struct service_processor *sp)
 230 {
 231         list_add(&sp->node, &service_processors);
 232 }
 233
 234 /* struct to save state between command file operations */
 235 struct ibmasmfs_command_data {
 236         struct service_processor        *sp;
 237         struct command                  *command;
 238 };
 239
 240 /* struct to save state between event file operations */
 241 struct ibmasmfs_event_data {
 242         struct service_processor        *sp;
 243         struct event_reader             reader;
 244         int                             active;
 245 };
 246
 247 /* struct to save state between reverse heartbeat file operations */
 248 struct ibmasmfs_heartbeat_data {
 249         struct service_processor        *sp;
 250         struct reverse_heartbeat        heartbeat;
 251         int                             active;
 252 };
 253
 254 static int command_file_open(struct inode *inode, struct file *file)
 255 {
 256         struct ibmasmfs_command_data *command_data;
 257
 258         if (!inode->u.generic_ip)
 259                 return -ENODEV;
 260
 261         command_data = kmalloc(sizeof(struct ibmasmfs_command_data), GFP_KERNEL);
 262         if (!command_data)
 263                 return -ENOMEM;
 264
 265         command_data->command = NULL;
 266         command_data->sp = inode->u.generic_ip;
 267         file->private_data = command_data;
 268         return 0;
 269 }
 270
 271 static int command_file_close(struct inode *inode, struct file *file)
 272 {
 273         struct ibmasmfs_command_data *command_data = file->private_data;
 274
 275         if (command_data->command)
 276                 command_put(command_data->command);
 277
 278         kfree(command_data);
 279         return 0;
 280 }
 281
 282 static ssize_t command_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 283 {
 284         struct ibmasmfs_command_data *command_data = file->private_data;
 285         struct command *cmd;
 286         int len;
 287         unsigned long flags;
 288
 289         if (*offset < 0)
 290                 return -EINVAL;
 291         if (count == 0 || count > IBMASM_CMD_MAX_BUFFER_SIZE)
 292                 return 0;
 293         if (*offset != 0)
 294                 return 0;
 295
 296         spin_lock_irqsave(&command_data->sp->lock, flags);
 297         cmd = command_data->command;
 298         if (cmd == NULL) {
 299                 spin_unlock_irqrestore(&command_data->sp->lock, flags);
 300                 return 0;
 301         }
 302         command_data->command = NULL;
 303         spin_unlock_irqrestore(&command_data->sp->lock, flags);
 304
 305         if (cmd->status != IBMASM_CMD_COMPLETE) {
 306                 command_put(cmd);
 307                 return -EIO;
 308         }
 309         len = min(count, cmd->buffer_size);
 310         if (copy_to_user(buf, cmd->buffer, len)) {
 311                 command_put(cmd);
 312                 return -EFAULT;
 313         }
 314         command_put(cmd);
 315
 316         return len;
 317 }
 318
 319 static ssize_t command_file_write(struct file *file, const char __user *ubuff, size_t count, loff_t *offset)
 320 {
 321         struct ibmasmfs_command_data *command_data = file->private_data;
 322         struct command *cmd;
 323         unsigned long flags;
 324
 325         if (*offset < 0)
 326                 return -EINVAL;
 327         if (count == 0 || count > IBMASM_CMD_MAX_BUFFER_SIZE)
 328                 return 0;
 329         if (*offset != 0)
 330                 return 0;
 331
 332         /* commands are executed sequentially, only one command at a time */
 333         if (command_data->command)
 334                 return -EAGAIN;
 335
 336         cmd = ibmasm_new_command(count);
 337         if (!cmd)
 338                 return -ENOMEM;
 339
 340         if (copy_from_user(cmd->buffer, ubuff, count)) {
 341                 command_put(cmd);
 342                 return -EFAULT;
 343         }
 344
 345         spin_lock_irqsave(&command_data->sp->lock, flags);
 346         if (command_data->command) {
 347                 spin_unlock_irqrestore(&command_data->sp->lock, flags);
 348                 command_put(cmd);
 349                 return -EAGAIN;
 350         }
 351         command_data->command = cmd;
 352         spin_unlock_irqrestore(&command_data->sp->lock, flags);
 353
 354         ibmasm_exec_command(command_data->sp, cmd);
 355         ibmasm_wait_for_response(cmd, get_dot_command_timeout(cmd->buffer));
 356
 357         return count;
 358 }
 359
 360 static int event_file_open(struct inode *inode, struct file *file)
 361 {
 362         struct ibmasmfs_event_data *event_data;
 363         struct service_processor *sp;
 364
 365         if (!inode->u.generic_ip)
 366                 return -ENODEV;
 367
 368         sp = inode->u.generic_ip;
 369
 370         event_data = kmalloc(sizeof(struct ibmasmfs_event_data), GFP_KERNEL);
 371         if (!event_data)
 372                 return -ENOMEM;
 373
 374         ibmasm_event_reader_register(sp, &event_data->reader);
 375
 376         event_data->sp = sp;
 377         event_data->active = 0;
 378         file->private_data = event_data;
 379         return 0;
 380 }
 381
 382 static int event_file_close(struct inode *inode, struct file *file)
 383 {
 384         struct ibmasmfs_event_data *event_data = file->private_data;
 385
 386         ibmasm_event_reader_unregister(event_data->sp, &event_data->reader);
 387         kfree(event_data);
 388         return 0;
 389 }
 390
 391 static ssize_t event_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 392 {
 393         struct ibmasmfs_event_data *event_data = file->private_data;
 394         struct event_reader *reader = &event_data->reader;
 395         struct service_processor *sp = event_data->sp;
 396         int ret;
 397         unsigned long flags;
 398
 399         if (*offset < 0)
 400                 return -EINVAL;
 401         if (count == 0 || count > IBMASM_EVENT_MAX_SIZE)
 402                 return 0;
 403         if (*offset != 0)
 404                 return 0;
 405
 406         spin_lock_irqsave(&sp->lock, flags);
 407         if (event_data->active) {
 408                 spin_unlock_irqrestore(&sp->lock, flags);
 409                 return -EBUSY;
 410         }
 411         event_data->active = 1;
 412         spin_unlock_irqrestore(&sp->lock, flags);
 413
 414         ret = ibmasm_get_next_event(sp, reader);
 415         if (ret <= 0)
 416                 goto out;
 417
 418         if (count < reader->data_size) {
 419                 ret = -EINVAL;
 420                 goto out;
 421         }
 422
 423         if (copy_to_user(buf, reader->data, reader->data_size)) {
 424                 ret = -EFAULT;
 425                 goto out;
 426         }
 427         ret = reader->data_size;
 428
 429 out:
 430         event_data->active = 0;
 431         return ret;
 432 }
 433
 434 static ssize_t event_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
 435 {
 436         struct ibmasmfs_event_data *event_data = file->private_data;
 437
 438         if (*offset < 0)
 439                 return -EINVAL;
 440         if (count != 1)
 441                 return 0;
 442         if (*offset != 0)
 443                 return 0;
 444
 445         ibmasm_cancel_next_event(&event_data->reader);
 446         return 0;
 447 }
 448
 449 static int r_heartbeat_file_open(struct inode *inode, struct file *file)
 450 {
 451         struct ibmasmfs_heartbeat_data *rhbeat;
 452
 453         if (!inode->u.generic_ip)
 454                 return -ENODEV;
 455
 456         rhbeat = kmalloc(sizeof(struct ibmasmfs_heartbeat_data), GFP_KERNEL);
 457         if (!rhbeat)
 458                 return -ENOMEM;
 459
 460         rhbeat->sp = (struct service_processor *)inode->u.generic_ip;
 461         rhbeat->active = 0;
 462         ibmasm_init_reverse_heartbeat(rhbeat->sp, &rhbeat->heartbeat);
 463         file->private_data = rhbeat;
 464         return 0;
 465 }
 466
 467 static int r_heartbeat_file_close(struct inode *inode, struct file *file)
 468 {
 469         struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
 470
 471         kfree(rhbeat);
 472         return 0;
 473 }
 474
 475 static ssize_t r_heartbeat_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 476 {
 477         struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
 478         unsigned long flags;
 479         int result;
 480
 481         if (*offset < 0)
 482                 return -EINVAL;
 483         if (count == 0 || count > 1024)
 484                 return 0;
 485         if (*offset != 0)
 486                 return 0;
 487
 488         /* allow only one reverse heartbeat per process */
 489         spin_lock_irqsave(&rhbeat->sp->lock, flags);
 490         if (rhbeat->active) {
 491                 spin_unlock_irqrestore(&rhbeat->sp->lock, flags);
 492                 return -EBUSY;
 493         }
 494         rhbeat->active = 1;
 495         spin_unlock_irqrestore(&rhbeat->sp->lock, flags);
 496
 497         result = ibmasm_start_reverse_heartbeat(rhbeat->sp, &rhbeat->heartbeat);
 498         rhbeat->active = 0;
 499
 500         return result;
 501 }
 502
 503 static ssize_t r_heartbeat_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
 504 {
 505         struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
 506
 507         if (*offset < 0)
 508                 return -EINVAL;
 509         if (count != 1)
 510                 return 0;
 511         if (*offset != 0)
 512                 return 0;
 513
 514         if (rhbeat->active)
 515                 ibmasm_stop_reverse_heartbeat(&rhbeat->heartbeat);
 516
 517         return 1;
 518 }
 519
 520 static int remote_settings_file_open(struct inode *inode, struct file *file)
 521 {
 522         file->private_data = inode->u.generic_ip;
 523         return 0;
 524 }
 525
 526 static int remote_settings_file_close(struct inode *inode, struct file *file)
 527 {
 528         return 0;
 529 }
 530
 531 static ssize_t remote_settings_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 532 {
 533         void __iomem *address = (void __iomem *)file->private_data;
 534         unsigned char *page;
 535         int retval;
 536         int len = 0;
 537         unsigned int value;
 538
 539         if (*offset < 0)
 540                 return -EINVAL;
 541         if (count == 0 || count > 1024)
 542                 return 0;
 543         if (*offset != 0)
 544                 return 0;
 545
 546         page = (unsigned char *)__get_free_page(GFP_KERNEL);
 547         if (!page)
 548                 return -ENOMEM;
 549
 550         value = readl(address);
 551         len = sprintf(page, "%d\n", value);
 552
 553         if (copy_to_user(buf, page, len)) {
 554                 retval = -EFAULT;
 555                 goto exit;
 556         }
 557         *offset += len;
 558         retval = len;
 559
 560 exit:
 561         free_page((unsigned long)page);
 562         return retval;
 563 }
 564
 565 static ssize_t remote_settings_file_write(struct file *file, const char __user *ubuff, size_t count, loff_t *offset)
 566 {
 567         void __iomem *address = (void __iomem *)file->private_data;
 568         char *buff;
 569         unsigned int value;
 570
 571         if (*offset < 0)
 572                 return -EINVAL;
 573         if (count == 0 || count > 1024)
 574                 return 0;
 575         if (*offset != 0)
 576                 return 0;
 577
 578         buff = kmalloc (count + 1, GFP_KERNEL);
 579         if (!buff)
 580                 return -ENOMEM;
 581
 582         memset(buff, 0x0, count + 1);
 583
 584         if (copy_from_user(buff, ubuff, count)) {
 585                 kfree(buff);
 586                 return -EFAULT;
 587         }
 588
 589         value = simple_strtoul(buff, NULL, 10);
 590         writel(value, address);
 591         kfree(buff);
 592
 593         return count;
 594 }
 595
 596 static int remote_event_file_open(struct inode *inode, struct file *file)
 597 {
 598         struct service_processor *sp;
 599         unsigned long flags;
 600         struct remote_queue *q;
 601
 602         file->private_data = inode->u.generic_ip;
 603         sp = file->private_data;
 604         q = &sp->remote_queue;
 605
 606         /* allow only one event reader */
 607         spin_lock_irqsave(&sp->lock, flags);
 608         if (q->open) {
 609                 spin_unlock_irqrestore(&sp->lock, flags);
 610                 return -EBUSY;
 611         }
 612         q->open = 1;
 613         spin_unlock_irqrestore(&sp->lock, flags);
 614
 615         enable_mouse_interrupts(sp);
 616
 617         return 0;
 618 }
 619
 620 static int remote_event_file_close(struct inode *inode, struct file *file)
 621 {
 622         struct service_processor *sp = file->private_data;
 623
 624         disable_mouse_interrupts(sp);
 625         wake_up_interruptible(&sp->remote_queue.wait);
 626         sp->remote_queue.open = 0;
 627
 628         return 0;
 629 }
 630
 631 static ssize_t remote_event_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
 632 {
 633         struct service_processor *sp = file->private_data;
 634         struct remote_queue *q = &sp->remote_queue;
 635         size_t data_size;
 636         struct remote_event *reader = q->reader;
 637         size_t num_events;
 638
 639         if (*offset < 0)
 640                 return -EINVAL;
 641         if (count == 0 || count > 1024)
 642                 return 0;
 643         if (*offset != 0)
 644                 return 0;
 645
 646         if (wait_event_interruptible(q->wait, q->reader != q->writer))
 647                 return -ERESTARTSYS;
 648
 649         /* only get multiples of struct remote_event */
 650         num_events = min((count/sizeof(struct remote_event)), ibmasm_events_available(q));
 651         if (!num_events)
 652                 return 0;
 653
 654         data_size = num_events * sizeof(struct remote_event);
 655
 656         if (copy_to_user(buf, reader, data_size))
 657                 return -EFAULT;
 658
 659         ibmasm_advance_reader(q, num_events);
 660
 661         return data_size;
 662 }
 663
 664
 665 static struct file_operations command_fops = {
 666         .open =         command_file_open,
 667         .release =      command_file_close,
 668         .read =         command_file_read,
 669         .write =        command_file_write,
 670 };
 671
 672 static struct file_operations event_fops = {
 673         .open =         event_file_open,
 674         .release =      event_file_close,
 675         .read =         event_file_read,
 676         .write =        event_file_write,
 677 };
 678
 679 static struct file_operations r_heartbeat_fops = {
 680         .open =         r_heartbeat_file_open,
 681         .release =      r_heartbeat_file_close,
 682         .read =         r_heartbeat_file_read,
 683         .write =        r_heartbeat_file_write,
 684 };
 685
 686 static struct file_operations remote_settings_fops = {
 687         .open =         remote_settings_file_open,
 688         .release =      remote_settings_file_close,
 689         .read =         remote_settings_file_read,
 690         .write =        remote_settings_file_write,
 691 };
 692
 693 static struct file_operations remote_event_fops = {
 694         .open =         remote_event_file_open,
 695         .release =      remote_event_file_close,
 696         .read =         remote_event_file_read,
 697 };
 698
 699
 700 static void ibmasmfs_create_files (struct super_block *sb, struct dentry *root)
 701 {
 702         struct list_head *entry;
 703         struct service_processor *sp;
 704
 705         list_for_each(entry, &service_processors) {
 706                 struct dentry *dir;
 707                 struct dentry *remote_dir;
 708                 sp = list_entry(entry, struct service_processor, node);
 709                 dir = ibmasmfs_create_dir(sb, root, sp->dirname);
 710                 if (!dir)
 711                         continue;
 712
 713                 ibmasmfs_create_file(sb, dir, "command", &command_fops, sp, S_IRUSR|S_IWUSR);
 714                 ibmasmfs_create_file(sb, dir, "event", &event_fops, sp, S_IRUSR|S_IWUSR);
 715                 ibmasmfs_create_file(sb, dir, "reverse_heartbeat", &r_heartbeat_fops, sp, S_IRUSR|S_IWUSR);
 716
 717                 remote_dir = ibmasmfs_create_dir(sb, dir, "remote_video");
 718                 if (!remote_dir)
 719                         continue;
 720
 721                 ibmasmfs_create_file(sb, remote_dir, "width", &remote_settings_fops, (void *)display_width(sp), S_IRUSR|S_IWUSR);
 722                 ibmasmfs_create_file(sb, remote_dir, "height", &remote_settings_fops, (void *)display_height(sp), S_IRUSR|S_IWUSR);
 723                 ibmasmfs_create_file(sb, remote_dir, "depth", &remote_settings_fops, (void *)display_depth(sp), S_IRUSR|S_IWUSR);
 724                 ibmasmfs_create_file(sb, remote_dir, "connected", &remote_settings_fops, (void *)vnc_status(sp), S_IRUSR);
 725                 ibmasmfs_create_file(sb, remote_dir, "events", &remote_event_fops, (void *)sp, S_IRUSR);
 726         }
 727 }