libcfs/include/libcfs/darwin/darwin-prim.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 /*
  31  * This file is part of Lustre, http://www.lustre.org/
  32  * Lustre is a trademark of Sun Microsystems, Inc.
  33  */
  34
  35 #ifndef __LIBCFS_DARWIN_CFS_PRIM_H__
  36 #define __LIBCFS_DARWIN_CFS_PRIM_H__
  37
  38 #ifndef __LIBCFS_LIBCFS_H__
  39 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
  40 #endif
  41
  42 #ifndef EXPORT_SYMBOL
  43 # define EXPORT_SYMBOL(s)
  44 #endif
  45
  46 #ifdef __KERNEL__
  47 #include <sys/types.h>
  48 #include <sys/systm.h>
  49
  50 #ifndef __DARWIN8__
  51 # ifndef __APPLE_API_PRIVATE
  52 #  define __APPLE_API_PRIVATE
  53 #  include <sys/user.h>
  54 #  undef __APPLE_API_PRIVATE
  55 # else
  56 #  include <sys/user.h>
  57 # endif
  58 # include <mach/mach_traps.h>
  59 # include <mach/thread_switch.h>
  60 # include <machine/cpu_number.h>
  61 #endif /* !__DARWIN8__ */
  62
  63 #include <sys/kernel.h>
  64
  65 #include <mach/thread_act.h>
  66 #include <mach/mach_types.h>
  67 #include <mach/time_value.h>
  68 #include <kern/sched_prim.h>
  69 #include <vm/pmap.h>
  70 #include <vm/vm_kern.h>
  71 #include <mach/machine/vm_param.h>
  72 #include <machine/machine_routines.h>
  73 #include <kern/clock.h>
  74 #include <kern/thread_call.h>
  75 #include <sys/param.h>
  76 #include <sys/vm.h>
  77
  78 #include <libcfs/darwin/darwin-types.h>
  79 #include <libcfs/darwin/darwin-utils.h>
  80 #include <libcfs/darwin/darwin-lock.h>
  81
  82 /*
  83  * Symbol functions for libcfs
  84  *
  85  * OSX has no facility for use to register symbol.
  86  * So we have to implement it.
  87  */
  88 #define CFS_SYMBOL_LEN     64
  89
  90 struct  cfs_symbol {
  91         char    name[CFS_SYMBOL_LEN];
  92         void    *value;
  93         int     ref;
  94         struct  list_head sym_list;
  95 };
  96
  97 extern kern_return_t            cfs_symbol_register(const char *, const void *);
  98 extern kern_return_t            cfs_symbol_unregister(const char *);
  99 extern void *                   cfs_symbol_get(const char *);
 100 extern kern_return_t            cfs_symbol_put(const char *);
 101
 102 /*
 103  * sysctl typedef
 104  *
 105  * User can register/unregister a list of sysctl_oids
 106  * sysctl_oid is data struct of osx's sysctl-entry
 107  */
 108 #define         CONFIG_SYSCTL   1
 109
 110 #define ctl_table sysctl_oid
 111 struct ctl_table *register_sysctl_table(struct ctl_table *table);
 112 void unregister_sysctl_table(struct ctl_table *table);
 113
 114 /*
 115  * Proc file system APIs, no /proc fs support in OSX
 116  */
 117 typedef struct cfs_proc_dir_entry {
 118         void            *data;
 119 } cfs_proc_dir_entry_t;
 120
 121 cfs_proc_dir_entry_t * cfs_create_proc_entry(char *name, int mod,
 122                                           cfs_proc_dir_entry_t *parent);
 123 void cfs_free_proc_entry(cfs_proc_dir_entry_t *de);
 124 void cfs_remove_proc_entry(char *name, cfs_proc_dir_entry_t *entry);
 125
 126 typedef int (read_proc_t)(char *page, char **start, off_t off,
 127                           int count, int *eof, void *data);
 128 typedef int (write_proc_t)(struct file *file, const char *buffer,
 129                            unsigned long count, void *data);
 130
 131 /*
 132  * cfs pseudo device
 133  *
 134  * struct miscdevice
 135  * misc_register:
 136  * misc_deregister:
 137  */
 138 struct miscdevice{
 139         int             index;
 140         void            *handle;
 141         const char      *name;
 142         struct cdevsw   *devsw;
 143         void            *private;
 144 };
 145
 146 extern kern_return_t            misc_register(struct miscdevice *);
 147 extern kern_return_t            misc_deregister(struct miscdevice *);
 148
 149 /*
 150  * Task struct and ...
 151  *
 152  * Using BSD current_proc in Darwin
 153  */
 154 extern boolean_t        assert_wait_possible(void);
 155 extern void             *get_bsdtask_info(task_t);
 156
 157 #ifdef __DARWIN8__
 158
 159 typedef struct task_struct {};
 160 #define current         ((struct task_struct *)current_thread())
 161 #else   /* !__DARWIN8__ */
 162
 163 #define task_struct uthread
 164
 165 #define current_uthread()       ((struct uthread *)get_bsdthread_info(current_act()))
 166 #define current         current_uthread()
 167
 168 #endif /* !__DARWIN8__ */
 169
 170 #define task_lock(t)    do {;} while (0)
 171 #define task_unlock(t)  do {;} while (0)
 172
 173 #define set_current_state(s)    do {;} while (0)
 174
 175 #define DECL_JOURNAL_DATA
 176 #define PUSH_JOURNAL    do {;} while(0)
 177 #define POP_JOURNAL             do {;} while(0)
 178
 179 /*
 180  * Kernel thread:
 181  *
 182  * OSX kernel thread can not be created with args,
 183  * so we have to implement new APIs to create thread with args
 184  */
 185
 186 typedef int (*cfs_thread_t)(void *);
 187
 188 extern task_t   kernel_task;
 189
 190 /*
 191  * cloning flags, no use in OSX, just copy them from Linux
 192  */
 193 #define CSIGNAL         0x000000ff      /* signal mask to be sent at exit */
 194 #define CLONE_VM        0x00000100      /* set if VM shared between processes */
 195 #define CLONE_FS        0x00000200      /* set if fs info shared between processes */
 196 #define CLONE_FILES     0x00000400      /* set if open files shared between processes */
 197 #define CLONE_SIGHAND   0x00000800      /* set if signal handlers and blocked signals shared */
 198 #define CLONE_PID       0x00001000      /* set if pid shared */
 199 #define CLONE_PTRACE    0x00002000      /* set if we want to let tracing continue on the child too */
 200 #define CLONE_VFORK     0x00004000      /* set if the parent wants the child to wake it up on mm_release */
 201 #define CLONE_PARENT    0x00008000      /* set if we want to have the same parent as the cloner */
 202 #define CLONE_THREAD    0x00010000      /* Same thread group? */
 203 #define CLONE_NEWNS     0x00020000      /* New namespace group? */
 204
 205 #define CLONE_SIGNAL    (CLONE_SIGHAND | CLONE_THREAD)
 206
 207 extern struct task_struct kthread_run(cfs_thread_t func, void *arg,
 208                               const char namefmt[], ...);
 209
 210 /*
 211  * Wait Queue implementation
 212  *
 213  * Like wait_queue in Linux
 214  */
 215 typedef struct cfs_waitq {
 216         struct ksleep_chan wq_ksleep_chan;
 217 } wait_queue_head_t;
 218
 219 typedef struct cfs_waitlink {
 220         struct cfs_waitq   *wl_waitq;
 221         struct ksleep_link  wl_ksleep_link;
 222 } wait_queue_t;
 223
 224 #define TASK_INTERRUPTIBLE      THREAD_ABORTSAFE
 225 #define TASK_UNINTERRUPTIBLE            THREAD_UNINT
 226
 227 void init_waitqueue_head(struct cfs_waitq *waitq);
 228 void init_waitqueue_entry_current(struct cfs_waitlink *link);
 229
 230 void add_wait_queue(struct cfs_waitq *waitq, struct cfs_waitlink *link);
 231 void add_wait_queue_exclusive(struct cfs_waitq *waitq,
 232                              struct cfs_waitlink *link);
 233 void remove_wait_queue(struct cfs_waitq *waitq, struct cfs_waitlink *link);
 234 int  waitqueue_active(struct cfs_waitq *waitq);
 235
 236 void wake_up(struct cfs_waitq *waitq);
 237 void wake_up_nr(struct cfs_waitq *waitq, int nr);
 238 void wake_up_all(struct cfs_waitq *waitq);
 239
 240 void waitq_wait(struct cfs_waitlink *link, long state);
 241 cfs_duration_t waitq_timedwait(struct cfs_waitlink *link,
 242                                    long state,
 243                                    cfs_duration_t timeout);
 244
 245 /*
 246  * Thread schedule APIs.
 247  */
 248 #define MAX_SCHEDULE_TIMEOUT    ((long)(~0UL>>12))
 249 extern void thread_set_timer_deadline(__u64 deadline);
 250 extern void thread_cancel_timer(void);
 251
 252 static inline int schedule_timeout(int state, int64_t timeout)
 253 {
 254         int          result;
 255
 256 #ifdef __DARWIN8__
 257         result = assert_wait((event_t)current_thread(), state);
 258 #else
 259         result = assert_wait((event_t)current_uthread(), state);
 260 #endif
 261         if (timeout > 0) {
 262                 __u64 expire;
 263                 nanoseconds_to_absolutetime(timeout, &expire);
 264                 clock_absolutetime_interval_to_deadline(expire, &expire);
 265                 thread_set_timer_deadline(expire);
 266         }
 267         if (result == THREAD_WAITING)
 268                 result = thread_block(THREAD_CONTINUE_NULL);
 269         if (timeout > 0)
 270                 thread_cancel_timer();
 271         if (result == THREAD_TIMED_OUT)
 272                 result = 0;
 273         else
 274                 result = 1;
 275         return result;
 276 }
 277
 278 #define schedule()      schedule_timeout(TASK_UNINTERRUPTIBLE, CFS_TICK)
 279 #define cfs_pause(tick) schedule_timeout(TASK_UNINTERRUPTIBLE, tick)
 280
 281 #define __wait_event(wq, condition)                             \
 282 do {                                                            \
 283         struct cfs_waitlink __wait;                             \
 284                                                                 \
 285         init_waitqueue_entry_current(&__wait);                  \
 286         for (;;) {                                              \
 287                 add_wait_queue(&wq, &__wait);                   \
 288                 if (condition)                                  \
 289                         break;                                  \
 290                 waitq_wait(&__wait, TASK_UNINTERRUPTIBLE);      \
 291                 remove_wait_queue(&wq, &__wait);                \
 292         }                                                       \
 293         remove_wait_queue(&wq, &__wait);                        \
 294 } while (0)
 295
 296 #define wait_event(wq, condition)                               \
 297 do {                                                            \
 298         if (condition)                                          \
 299                 break;                                          \
 300         __wait_event(wq, condition);                            \
 301 } while (0)
 302
 303 #define __wait_event_interruptible(wq, condition, ex, ret)      \
 304 do {                                                            \
 305         struct cfs_waitlink __wait;                             \
 306                                                                 \
 307         init_waitqueue_entry_current(&__wait);                  \
 308         for (;;) {                                              \
 309                 if (ex == 0)                                    \
 310                         add_wait_queue(&wq, &__wait);           \
 311                 else                                            \
 312                         add_wait_queue_exclusive(&wq, &__wait); \
 313                 if (condition)                                  \
 314                         break;                                  \
 315                 if (!cfs_signal_pending()) {                    \
 316                         waitq_wait(&__wait,                     \
 317                                        TASK_INTERRUPTIBLE);     \
 318                         remove_wait_queue(&wq, &__wait);        \
 319                         continue;                               \
 320                 }                                               \
 321                 ret = -ERESTARTSYS;                             \
 322                 break;                                          \
 323         }                                                       \
 324         remove_wait_queue(&wq, &__wait);                        \
 325 } while (0)
 326
 327 #define wait_event_interruptible(wq, condition)                 \
 328 ({                                                              \
 329         int __ret = 0;                                          \
 330         if (!condition)                                         \
 331                 __wait_event_interruptible(wq, condition,       \
 332                                            0, __ret);           \
 333         __ret;                                                  \
 334 })
 335
 336 #define wait_event_interruptible_exclusive(wq, condition)       \
 337 ({                                                              \
 338         int __ret = 0;                                          \
 339         if (!condition)                                         \
 340                 __wait_event_interruptible(wq, condition,       \
 341                                            1, __ret);           \
 342         __ret;                                                  \
 343 })
 344
 345 #ifndef __DARWIN8__
 346 extern void     wakeup_one __P((void * chan));
 347 #endif
 348 /* only used in tests */
 349 #define wake_up_process(p)                                      \
 350         do {                                                    \
 351                 wakeup_one((caddr_t)p);                         \
 352         } while (0)
 353
 354 /* used in couple of places */
 355 static inline void sleep_on(wait_queue_head_t *waitq)
 356 {
 357         wait_queue_t link;
 358
 359         init_waitqueue_entry_current(&link);
 360         add_wait_queue(waitq, &link);
 361         waitq_wait(&link, TASK_UNINTERRUPTIBLE);
 362         remove_wait_queue(waitq, &link);
 363 }
 364
 365 /*
 366  * Signal
 367  */
 368
 369 /*
 370  * Timer
 371  */
 372 struct timer_list {
 373         struct ktimer t;
 374 };
 375
 376 #define cfs_init_timer(t)       do {} while(0)
 377 void cfs_timer_init(struct timer_list *t, void (*func)(unsigned long), void *arg);
 378 void cfs_timer_done(struct timer_list *t);
 379 void cfs_timer_arm(struct timer_list *t, cfs_time_t deadline);
 380 void cfs_timer_disarm(struct timer_list *t);
 381 int  cfs_timer_is_armed(struct timer_list *t);
 382
 383 cfs_time_t cfs_timer_deadline(struct timer_list *t);
 384
 385 /*
 386  * Ioctl
 387  * We don't need to copy out everything in osx
 388  */
 389 #define cfs_ioctl_data_out(a, d, l)                     \
 390         ({                                              \
 391                 int __size;                             \
 392                 int __rc = 0;                           \
 393                 assert((l) >= sizeof(*d));              \
 394                 __size = (l) - sizeof(*d);              \
 395                 if (__size > 0)                         \
 396                         __rc = copy_to_user((void *)a + __size, \
 397                              (void *)d + __size,        \
 398                              __size);                   \
 399                 __rc;                                   \
 400         })
 401
 402 /*
 403  * CPU
 404  */
 405 /* Run in PowerG5 who is PPC64 */
 406 #define SMP_CACHE_BYTES                         128
 407 #define __cacheline_aligned                     __attribute__((__aligned__(SMP_CACHE_BYTES)))
 408 #define NR_CPUS                                 2
 409
 410 /*
 411  * XXX Liang: patch xnu and export current_processor()?
 412  *
 413  * #define smp_processor_id()                   current_processor()
 414  */
 415 #define smp_processor_id()                      0
 416 /* XXX smp_call_function is not supported in xnu */
 417 #define smp_call_function(f, a, n, w)           do {} while(0)
 418 int cfs_online_cpus(void);
 419
 420 /*
 421  * Misc
 422  */
 423 extern int is_suser(void);
 424
 425 #ifndef likely
 426 #define likely(exp) (exp)
 427 #endif
 428 #ifndef unlikely
 429 #define unlikely(exp) (exp)
 430 #endif
 431
 432 #define lock_kernel()                                   do {} while(0)
 433 #define unlock_kernel()                                 do {} while(0)
 434
 435 #define call_usermodehelper(path, argv, envp, 1)        (0)
 436
 437 #define cfs_module(name, version, init, fini)                           \
 438 extern kern_return_t _start(kmod_info_t *ki, void *data);               \
 439 extern kern_return_t _stop(kmod_info_t *ki, void *data);                \
 440 __private_extern__ kern_return_t name##_start(kmod_info_t *ki, void *data); \
 441 __private_extern__ kern_return_t name##_stop(kmod_info_t *ki, void *data); \
 442                                                                         \
 443 kmod_info_t KMOD_INFO_NAME = { 0, KMOD_INFO_VERSION, -1,                \
 444                                { "com.clusterfs.lustre." #name }, { version }, \
 445                                -1, 0, 0, 0, 0, name##_start, name##_stop }; \
 446                                                                         \
 447 __private_extern__ kmod_start_func_t *_realmain = name##_start;         \
 448 __private_extern__ kmod_stop_func_t *_antimain = name##_stop;           \
 449 __private_extern__ int _kext_apple_cc = __APPLE_CC__ ;                  \
 450                                                                         \
 451 kern_return_t name##_start(kmod_info_t *ki, void *d)                    \
 452 {                                                                       \
 453         return init();                                                  \
 454 }                                                                       \
 455                                                                         \
 456 kern_return_t name##_stop(kmod_info_t *ki, void *d)                     \
 457 {                                                                       \
 458         fini();                                                         \
 459         return KERN_SUCCESS;                                            \
 460 }                                                                       \
 461                                                                         \
 462 /*                                                                      \
 463  * to allow semicolon after cfs_module(...)                             \
 464  */                                                                     \
 465 struct __dummy_ ## name ## _struct {}
 466
 467 #define inter_module_get(n)                     cfs_symbol_get(n)
 468 #define inter_module_put(n)                     cfs_symbol_put(n)
 469
 470 static inline int request_module(const char *name, ...)
 471 {
 472         return (-EINVAL);
 473 }
 474
 475 #ifndef __exit
 476 #define __exit
 477 #endif
 478 #ifndef __init
 479 #define __init
 480 #endif
 481
 482 #define MODULE_AUTHOR(s)
 483 #define MODULE_DESCRIPTION(s)
 484 #define MODULE_LICENSE(s)
 485 #define MODULE_PARM(a, b)
 486 #define MODULE_PARM_DESC(a, b)
 487
 488 #define NR_IRQS                         512
 489 #define in_interrupt()                  ml_at_interrupt_context()
 490
 491 #define KERN_EMERG      "<0>"   /* system is unusable                   */
 492 #define KERN_ALERT      "<1>"   /* action must be taken immediately     */
 493 #define KERN_CRIT       "<2>"   /* critical conditions                  */
 494 #define KERN_ERR        "<3>"   /* error conditions                     */
 495 #define KERN_WARNING    "<4>"   /* warning conditions                   */
 496 #define KERN_NOTICE     "<5>"   /* normal but significant condition     */
 497 #define KERN_INFO       "<6>"   /* informational                        */
 498 #define KERN_DEBUG      "<7>"   /* debug-level messages                 */
 499
 500 static inline long PTR_ERR(const void *ptr)
 501 {
 502         return (long) ptr;
 503 }
 504
 505 #define ERR_PTR(err)    ((void *)err)
 506 #define IS_ERR(p)       ((unsigned long)(p) + 1000 < 1000)
 507
 508 #else   /* !__KERNEL__ */
 509
 510 typedef struct cfs_proc_dir_entry {
 511         void            *data;
 512 } cfs_proc_dir_entry_t;
 513
 514 #include <libcfs/user-prim.h>
 515 #define __WORDSIZE      32
 516
 517 #endif  /* END __KERNEL__ */
 518 /*
 519  * Error number
 520  */
 521 #ifndef EPROTO
 522 #define EPROTO          EPROTOTYPE
 523 #endif
 524 #ifndef EBADR
 525 #define EBADR           EBADRPC
 526 #endif
 527 #ifndef ERESTARTSYS
 528 #define ERESTARTSYS     512
 529 #endif
 530 #ifndef EDEADLOCK
 531 #define EDEADLOCK       EDEADLK
 532 #endif
 533 #ifndef ECOMM
 534 #define ECOMM           EINVAL
 535 #endif
 536 #ifndef ENODATA
 537 #define ENODATA         EINVAL
 538 #endif
 539 #ifndef ENOTSUPP
 540 #define ENOTSUPP        EINVAL
 541 #endif
 542
 543 #if BYTE_ORDER == BIG_ENDIAN
 544 # define __BIG_ENDIAN
 545 #else
 546 # define __LITTLE_ENDIAN
 547 #endif
 548
 549 #endif  /* __LIBCFS_DARWIN_CFS_PRIM_H__ */