drivers/misc/sgi-gru/grutables.h

   1 /*
   2  * SN Platform GRU Driver
   3  *
   4  *            GRU DRIVER TABLES, MACROS, externs, etc
   5  *
   6  *  Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  */
  22
  23 #ifndef __GRUTABLES_H__
  24 #define __GRUTABLES_H__
  25
  26 /*
  27  * Tables:
  28  *
  29  *      VDATA-VMA Data          - Holds a few parameters. Head of linked list of
  30  *                                GTS tables for threads using the GSEG
  31  *      GTS - Gru Thread State  - contains info for managing a GSEG context. A
  32  *                                GTS is allocated for each thread accessing a
  33  *                                GSEG.
  34  *      GTD - GRU Thread Data   - contains shadow copy of GRU data when GSEG is
  35  *                                not loaded into a GRU
  36  *      GMS - GRU Memory Struct - Used to manage TLB shootdowns. Tracks GRUs
  37  *                                where a GSEG has been loaded. Similar to
  38  *                                an mm_struct but for GRU.
  39  *
  40  *      GS  - GRU State         - Used to manage the state of a GRU chiplet
  41  *      BS  - Blade State       - Used to manage state of all GRU chiplets
  42  *                                on a blade
  43  *
  44  *
  45  *  Normal task tables for task using GRU.
  46  *              - 2 threads in process
  47  *              - 2 GSEGs open in process
  48  *              - GSEG1 is being used by both threads
  49  *              - GSEG2 is used only by thread 2
  50  *
  51  *       task -->|
  52  *       task ---+---> mm ->------ (notifier) -------+-> gms
  53  *                     |                             |
  54  *                     |--> vma -> vdata ---> gts--->|          GSEG1 (thread1)
  55  *                     |                  |          |
  56  *                     |                  +-> gts--->|          GSEG1 (thread2)
  57  *                     |                             |
  58  *                     |--> vma -> vdata ---> gts--->|          GSEG2 (thread2)
  59  *                     .
  60  *                     .
  61  *
  62  *  GSEGs are marked DONTCOPY on fork
  63  *
  64  * At open
  65  *      file.private_data -> NULL
  66  *
  67  * At mmap,
  68  *      vma -> vdata
  69  *
  70  * After gseg reference
  71  *      vma -> vdata ->gts
  72  *
  73  * After fork
  74  *   parent
  75  *      vma -> vdata -> gts
  76  *   child
  77  *      (vma is not copied)
  78  *
  79  */
  80
  81 #include <linux/rmap.h>
  82 #include <linux/interrupt.h>
  83 #include <linux/mutex.h>
  84 #include <linux/wait.h>
  85 #include <linux/mmu_notifier.h>
  86 #include "gru.h"
  87 #include "gruhandles.h"
  88
  89 extern struct gru_stats_s gru_stats;
  90 extern struct gru_blade_state *gru_base[];
  91 extern unsigned long gru_start_paddr, gru_end_paddr;
  92
  93 #define GRU_MAX_BLADES          MAX_NUMNODES
  94 #define GRU_MAX_GRUS            (GRU_MAX_BLADES * GRU_CHIPLETS_PER_BLADE)
  95
  96 #define GRU_DRIVER_ID_STR       "SGI GRU Device Driver"
  97 #define GRU_DRIVER_VERSION_STR  "0.80"
  98
  99 /*
 100  * GRU statistics.
 101  */
 102 struct gru_stats_s {
 103         atomic_long_t vdata_alloc;
 104         atomic_long_t vdata_free;
 105         atomic_long_t gts_alloc;
 106         atomic_long_t gts_free;
 107         atomic_long_t vdata_double_alloc;
 108         atomic_long_t gts_double_allocate;
 109         atomic_long_t assign_context;
 110         atomic_long_t assign_context_failed;
 111         atomic_long_t free_context;
 112         atomic_long_t load_context;
 113         atomic_long_t unload_context;
 114         atomic_long_t steal_context;
 115         atomic_long_t steal_context_failed;
 116         atomic_long_t nopfn;
 117         atomic_long_t break_cow;
 118         atomic_long_t asid_new;
 119         atomic_long_t asid_next;
 120         atomic_long_t asid_wrap;
 121         atomic_long_t asid_reuse;
 122         atomic_long_t intr;
 123         atomic_long_t call_os;
 124         atomic_long_t call_os_check_for_bug;
 125         atomic_long_t call_os_wait_queue;
 126         atomic_long_t user_flush_tlb;
 127         atomic_long_t user_unload_context;
 128         atomic_long_t user_exception;
 129         atomic_long_t set_task_slice;
 130         atomic_long_t migrate_check;
 131         atomic_long_t migrated_retarget;
 132         atomic_long_t migrated_unload;
 133         atomic_long_t migrated_unload_delay;
 134         atomic_long_t migrated_nopfn_retarget;
 135         atomic_long_t migrated_nopfn_unload;
 136         atomic_long_t tlb_dropin;
 137         atomic_long_t tlb_dropin_fail_no_asid;
 138         atomic_long_t tlb_dropin_fail_upm;
 139         atomic_long_t tlb_dropin_fail_invalid;
 140         atomic_long_t tlb_dropin_fail_range_active;
 141         atomic_long_t tlb_dropin_fail_idle;
 142         atomic_long_t tlb_dropin_fail_fmm;
 143         atomic_long_t mmu_invalidate_range;
 144         atomic_long_t mmu_invalidate_page;
 145         atomic_long_t mmu_clear_flush_young;
 146         atomic_long_t flush_tlb;
 147         atomic_long_t flush_tlb_gru;
 148         atomic_long_t flush_tlb_gru_tgh;
 149         atomic_long_t flush_tlb_gru_zero_asid;
 150
 151         atomic_long_t copy_gpa;
 152
 153         atomic_long_t mesq_receive;
 154         atomic_long_t mesq_receive_none;
 155         atomic_long_t mesq_send;
 156         atomic_long_t mesq_send_failed;
 157         atomic_long_t mesq_noop;
 158         atomic_long_t mesq_send_unexpected_error;
 159         atomic_long_t mesq_send_lb_overflow;
 160         atomic_long_t mesq_send_qlimit_reached;
 161         atomic_long_t mesq_send_amo_nacked;
 162         atomic_long_t mesq_send_put_nacked;
 163         atomic_long_t mesq_qf_not_full;
 164         atomic_long_t mesq_qf_locked;
 165         atomic_long_t mesq_qf_noop_not_full;
 166         atomic_long_t mesq_qf_switch_head_failed;
 167         atomic_long_t mesq_qf_unexpected_error;
 168         atomic_long_t mesq_noop_unexpected_error;
 169         atomic_long_t mesq_noop_lb_overflow;
 170         atomic_long_t mesq_noop_qlimit_reached;
 171         atomic_long_t mesq_noop_amo_nacked;
 172         atomic_long_t mesq_noop_put_nacked;
 173
 174 };
 175
 176 #define OPT_DPRINT      1
 177 #define OPT_STATS       2
 178 #define GRU_QUICKLOOK   4
 179
 180
 181 #define IRQ_GRU                 110     /* Starting IRQ number for interrupts */
 182
 183 /* Delay in jiffies between attempts to assign a GRU context */
 184 #define GRU_ASSIGN_DELAY        ((HZ * 20) / 1000)
 185
 186 /*
 187  * If a process has it's context stolen, min delay in jiffies before trying to
 188  * steal a context from another process.
 189  */
 190 #define GRU_STEAL_DELAY         ((HZ * 200) / 1000)
 191
 192 #define STAT(id)        do {                                            \
 193                                 if (options & OPT_STATS)                \
 194                                         atomic_long_inc(&gru_stats.id); \
 195                         } while (0)
 196
 197 #ifdef CONFIG_SGI_GRU_DEBUG
 198 #define gru_dbg(dev, fmt, x...)                                         \
 199         do {                                                            \
 200                 if (options & OPT_DPRINT)                               \
 201                         dev_dbg(dev, "%s: " fmt, __func__, x);          \
 202         } while (0)
 203 #else
 204 #define gru_dbg(x...)
 205 #endif
 206
 207 /*-----------------------------------------------------------------------------
 208  * ASID management
 209  */
 210 #define MAX_ASID        0xfffff0
 211 #define MIN_ASID        8
 212 #define ASID_INC        8       /* number of regions */
 213
 214 /* Generate a GRU asid value from a GRU base asid & a virtual address. */
 215 #if defined CONFIG_IA64
 216 #define VADDR_HI_BIT            64
 217 #define GRUREGION(addr)         ((addr) >> (VADDR_HI_BIT - 3) & 3)
 218 #elif defined __x86_64
 219 #define VADDR_HI_BIT            48
 220 #define GRUREGION(addr)         (0)             /* ZZZ could do better */
 221 #else
 222 #error "Unsupported architecture"
 223 #endif
 224 #define GRUASID(asid, addr)     ((asid) + GRUREGION(addr))
 225
 226 /*------------------------------------------------------------------------------
 227  *  File & VMS Tables
 228  */
 229
 230 struct gru_state;
 231
 232 /*
 233  * This structure is pointed to from the mmstruct via the notifier pointer.
 234  * There is one of these per address space.
 235  */
 236 struct gru_mm_tracker {
 237         unsigned int            mt_asid_gen;    /* ASID wrap count */
 238         int                     mt_asid;        /* current base ASID for gru */
 239         unsigned short          mt_ctxbitmap;   /* bitmap of contexts using
 240                                                    asid */
 241 };
 242
 243 struct gru_mm_struct {
 244         struct mmu_notifier     ms_notifier;
 245         atomic_t                ms_refcnt;
 246         spinlock_t              ms_asid_lock;   /* protects ASID assignment */
 247         atomic_t                ms_range_active;/* num range_invals active */
 248         char                    ms_released;
 249         wait_queue_head_t       ms_wait_queue;
 250         DECLARE_BITMAP(ms_asidmap, GRU_MAX_GRUS);
 251         struct gru_mm_tracker   ms_asids[GRU_MAX_GRUS];
 252 };
 253
 254 /*
 255  * One of these structures is allocated when a GSEG is mmaped. The
 256  * structure is pointed to by the vma->vm_private_data field in the vma struct.
 257  */
 258 struct gru_vma_data {
 259         spinlock_t              vd_lock;        /* Serialize access to vma */
 260         struct list_head        vd_head;        /* head of linked list of gts */
 261         long                    vd_user_options;/* misc user option flags */
 262         int                     vd_cbr_au_count;
 263         int                     vd_dsr_au_count;
 264 };
 265
 266 /*
 267  * One of these is allocated for each thread accessing a mmaped GRU. A linked
 268  * list of these structure is hung off the struct gru_vma_data in the mm_struct.
 269  */
 270 struct gru_thread_state {
 271         struct list_head        ts_next;        /* list - head at vma-private */
 272         struct mutex            ts_ctxlock;     /* load/unload CTX lock */
 273         struct mm_struct        *ts_mm;         /* mm currently mapped to
 274                                                    context */
 275         struct vm_area_struct   *ts_vma;        /* vma of GRU context */
 276         struct gru_state        *ts_gru;        /* GRU where the context is
 277                                                    loaded */
 278         struct gru_mm_struct    *ts_gms;        /* asid & ioproc struct */
 279         unsigned long           ts_cbr_map;     /* map of allocated CBRs */
 280         unsigned long           ts_dsr_map;     /* map of allocated DATA
 281                                                    resources */
 282         unsigned long           ts_steal_jiffies;/* jiffies when context last
 283                                                     stolen */
 284         long                    ts_user_options;/* misc user option flags */
 285         pid_t                   ts_tgid_owner;  /* task that is using the
 286                                                    context - for migration */
 287         int                     ts_tsid;        /* thread that owns the
 288                                                    structure */
 289         int                     ts_tlb_int_select;/* target cpu if interrupts
 290                                                      enabled */
 291         int                     ts_ctxnum;      /* context number where the
 292                                                    context is loaded */
 293         atomic_t                ts_refcnt;      /* reference count GTS */
 294         unsigned char           ts_dsr_au_count;/* Number of DSR resources
 295                                                    required for contest */
 296         unsigned char           ts_cbr_au_count;/* Number of CBR resources
 297                                                    required for contest */
 298         char                    ts_force_unload;/* force context to be unloaded
 299                                                    after migration */
 300         char                    ts_cbr_idx[GRU_CBR_AU];/* CBR numbers of each
 301                                                           allocated CB */
 302         unsigned long           ts_gdata[0];    /* save area for GRU data (CB,
 303                                                    DS, CBE) */
 304 };
 305
 306 /*
 307  * Threaded programs actually allocate an array of GSEGs when a context is
 308  * created. Each thread uses a separate GSEG. TSID is the index into the GSEG
 309  * array.
 310  */
 311 #define TSID(a, v)              (((a) - (v)->vm_start) / GRU_GSEG_PAGESIZE)
 312 #define UGRUADDR(gts)           ((gts)->ts_vma->vm_start +              \
 313                                         (gts)->ts_tsid * GRU_GSEG_PAGESIZE)
 314
 315 #define NULLCTX                 (-1)    /* if context not loaded into GRU */
 316
 317 /*-----------------------------------------------------------------------------
 318  *  GRU State Tables
 319  */
 320
 321 /*
 322  * One of these exists for each GRU chiplet.
 323  */
 324 struct gru_state {
 325         struct gru_blade_state  *gs_blade;              /* GRU state for entire
 326                                                            blade */
 327         unsigned long           gs_gru_base_paddr;      /* Physical address of
 328                                                            gru segments (64) */
 329         void                    *gs_gru_base_vaddr;     /* Virtual address of
 330                                                            gru segments (64) */
 331         unsigned char           gs_gid;                 /* unique GRU number */
 332         unsigned char           gs_tgh_local_shift;     /* used to pick TGH for
 333                                                            local flush */
 334         unsigned char           gs_tgh_first_remote;    /* starting TGH# for
 335                                                            remote flush */
 336         unsigned short          gs_blade_id;            /* blade of GRU */
 337         spinlock_t              gs_asid_lock;           /* lock used for
 338                                                            assigning asids */
 339         spinlock_t              gs_lock;                /* lock used for
 340                                                            assigning contexts */
 341
 342         /* -- the following are protected by the gs_asid_lock spinlock ---- */
 343         unsigned int            gs_asid;                /* Next availe ASID */
 344         unsigned int            gs_asid_limit;          /* Limit of available
 345                                                            ASIDs */
 346         unsigned int            gs_asid_gen;            /* asid generation.
 347                                                            Inc on wrap */
 348
 349         /* --- the following fields are protected by the gs_lock spinlock --- */
 350         unsigned long           gs_context_map;         /* bitmap to manage
 351                                                            contexts in use */
 352         unsigned long           gs_cbr_map;             /* bitmap to manage CB
 353                                                            resources */
 354         unsigned long           gs_dsr_map;             /* bitmap used to manage
 355                                                            DATA resources */
 356         unsigned int            gs_reserved_cbrs;       /* Number of kernel-
 357                                                            reserved cbrs */
 358         unsigned int            gs_reserved_dsr_bytes;  /* Bytes of kernel-
 359                                                            reserved dsrs */
 360         unsigned short          gs_active_contexts;     /* number of contexts
 361                                                            in use */
 362         struct gru_thread_state *gs_gts[GRU_NUM_CCH];   /* GTS currently using
 363                                                            the context */
 364 };
 365
 366 /*
 367  * This structure contains the GRU state for all the GRUs on a blade.
 368  */
 369 struct gru_blade_state {
 370         void                    *kernel_cb;             /* First kernel
 371                                                            reserved cb */
 372         void                    *kernel_dsr;            /* First kernel
 373                                                            reserved DSR */
 374         /* ---- the following are protected by the bs_lock spinlock ---- */
 375         spinlock_t              bs_lock;                /* lock used for
 376                                                            stealing contexts */
 377         int                     bs_lru_ctxnum;          /* STEAL - last context
 378                                                            stolen */
 379         struct gru_state        *bs_lru_gru;            /* STEAL - last gru
 380                                                            stolen */
 381
 382         struct gru_state        bs_grus[GRU_CHIPLETS_PER_BLADE];
 383 };
 384
 385 /*-----------------------------------------------------------------------------
 386  * Address Primitives
 387  */
 388 #define get_tfm_for_cpu(g, c)                                           \
 389         ((struct gru_tlb_fault_map *)get_tfm((g)->gs_gru_base_vaddr, (c)))
 390 #define get_tfh_by_index(g, i)                                          \
 391         ((struct gru_tlb_fault_handle *)get_tfh((g)->gs_gru_base_vaddr, (i)))
 392 #define get_tgh_by_index(g, i)                                          \
 393         ((struct gru_tlb_global_handle *)get_tgh((g)->gs_gru_base_vaddr, (i)))
 394 #define get_cbe_by_index(g, i)                                          \
 395         ((struct gru_control_block_extended *)get_cbe((g)->gs_gru_base_vaddr,\
 396                         (i)))
 397
 398 /*-----------------------------------------------------------------------------
 399  * Useful Macros
 400  */
 401
 402 /* Given a blade# & chiplet#, get a pointer to the GRU */
 403 #define get_gru(b, c)           (&gru_base[b]->bs_grus[c])
 404
 405 /* Number of bytes to save/restore when unloading/loading GRU contexts */
 406 #define DSR_BYTES(dsr)          ((dsr) * GRU_DSR_AU_BYTES)
 407 #define CBR_BYTES(cbr)          ((cbr) * GRU_HANDLE_BYTES * GRU_CBR_AU_SIZE * 2)
 408
 409 /* Convert a user CB number to the actual CBRNUM */
 410 #define thread_cbr_number(gts, n) ((gts)->ts_cbr_idx[(n) / GRU_CBR_AU_SIZE] \
 411                                   * GRU_CBR_AU_SIZE + (n) % GRU_CBR_AU_SIZE)
 412
 413 /* Convert a gid to a pointer to the GRU */
 414 #define GID_TO_GRU(gid)                                                 \
 415         (gru_base[(gid) / GRU_CHIPLETS_PER_BLADE] ?                     \
 416                 (&gru_base[(gid) / GRU_CHIPLETS_PER_BLADE]->            \
 417                         bs_grus[(gid) % GRU_CHIPLETS_PER_BLADE]) :      \
 418          NULL)
 419
 420 /* Scan all active GRUs in a GRU bitmap */
 421 #define for_each_gru_in_bitmap(gid, map)                                \
 422         for ((gid) = find_first_bit((map), GRU_MAX_GRUS); (gid) < GRU_MAX_GRUS;\
 423                 (gid)++, (gid) = find_next_bit((map), GRU_MAX_GRUS, (gid)))
 424
 425 /* Scan all active GRUs on a specific blade */
 426 #define for_each_gru_on_blade(gru, nid, i)                              \
 427         for ((gru) = gru_base[nid]->bs_grus, (i) = 0;                   \
 428                         (i) < GRU_CHIPLETS_PER_BLADE;                   \
 429                         (i)++, (gru)++)
 430
 431 /* Scan all active GTSs on a gru. Note: must hold ss_lock to use this macro. */
 432 #define for_each_gts_on_gru(gts, gru, ctxnum)                           \
 433         for ((ctxnum) = 0; (ctxnum) < GRU_NUM_CCH; (ctxnum)++)          \
 434                 if (((gts) = (gru)->gs_gts[ctxnum]))
 435
 436 /* Scan each CBR whose bit is set in a TFM (or copy of) */
 437 #define for_each_cbr_in_tfm(i, map)                                     \
 438         for ((i) = find_first_bit(map, GRU_NUM_CBE);                    \
 439                         (i) < GRU_NUM_CBE;                              \
 440                         (i)++, (i) = find_next_bit(map, GRU_NUM_CBE, i))
 441
 442 /* Scan each CBR in a CBR bitmap. Note: multiple CBRs in an allocation unit */
 443 #define for_each_cbr_in_allocation_map(i, map, k)                       \
 444         for ((k) = find_first_bit(map, GRU_CBR_AU); (k) < GRU_CBR_AU;   \
 445                         (k) = find_next_bit(map, GRU_CBR_AU, (k) + 1))  \
 446                 for ((i) = (k)*GRU_CBR_AU_SIZE;                         \
 447                                 (i) < ((k) + 1) * GRU_CBR_AU_SIZE; (i)++)
 448
 449 /* Scan each DSR in a DSR bitmap. Note: multiple DSRs in an allocation unit */
 450 #define for_each_dsr_in_allocation_map(i, map, k)                       \
 451         for ((k) = find_first_bit((const unsigned long *)map, GRU_DSR_AU);\
 452                         (k) < GRU_DSR_AU;                               \
 453                         (k) = find_next_bit((const unsigned long *)map, \
 454                                           GRU_DSR_AU, (k) + 1))         \
 455                 for ((i) = (k) * GRU_DSR_AU_CL;                         \
 456                                 (i) < ((k) + 1) * GRU_DSR_AU_CL; (i)++)
 457
 458 #define gseg_physical_address(gru, ctxnum)                              \
 459                 ((gru)->gs_gru_base_paddr + ctxnum * GRU_GSEG_STRIDE)
 460 #define gseg_virtual_address(gru, ctxnum)                               \
 461                 ((gru)->gs_gru_base_vaddr + ctxnum * GRU_GSEG_STRIDE)
 462
 463 /*-----------------------------------------------------------------------------
 464  * Lock / Unlock GRU handles
 465  *      Use the "delresp" bit in the handle as a "lock" bit.
 466  */
 467
 468 /* Lock hierarchy checking enabled only in emulator */
 469
 470 static inline void __lock_handle(void *h)
 471 {
 472         while (test_and_set_bit(1, h))
 473                 cpu_relax();
 474 }
 475
 476 static inline void __unlock_handle(void *h)
 477 {
 478         clear_bit(1, h);
 479 }
 480
 481 static inline void lock_cch_handle(struct gru_context_configuration_handle *cch)
 482 {
 483         __lock_handle(cch);
 484 }
 485
 486 static inline void unlock_cch_handle(struct gru_context_configuration_handle
 487                                      *cch)
 488 {
 489         __unlock_handle(cch);
 490 }
 491
 492 static inline void lock_tgh_handle(struct gru_tlb_global_handle *tgh)
 493 {
 494         __lock_handle(tgh);
 495 }
 496
 497 static inline void unlock_tgh_handle(struct gru_tlb_global_handle *tgh)
 498 {
 499         __unlock_handle(tgh);
 500 }
 501
 502 /*-----------------------------------------------------------------------------
 503  * Function prototypes & externs
 504  */
 505 struct gru_unload_context_req;
 506
 507 extern struct vm_operations_struct gru_vm_ops;
 508 extern struct device *grudev;
 509
 510 extern struct gru_vma_data *gru_alloc_vma_data(struct vm_area_struct *vma,
 511                                 int tsid);
 512 extern struct gru_thread_state *gru_find_thread_state(struct vm_area_struct
 513                                 *vma, int tsid);
 514 extern struct gru_thread_state *gru_alloc_thread_state(struct vm_area_struct
 515                                 *vma, int tsid);
 516 extern void gru_unload_context(struct gru_thread_state *gts, int savestate);
 517 extern void gts_drop(struct gru_thread_state *gts);
 518 extern void gru_tgh_flush_init(struct gru_state *gru);
 519 extern int gru_kservices_init(struct gru_state *gru);
 520 extern irqreturn_t gru_intr(int irq, void *dev_id);
 521 extern int gru_handle_user_call_os(unsigned long address);
 522 extern int gru_user_flush_tlb(unsigned long arg);
 523 extern int gru_user_unload_context(unsigned long arg);
 524 extern int gru_get_exception_detail(unsigned long arg);
 525 extern int gru_set_task_slice(long address);
 526 extern int gru_cpu_fault_map_id(void);
 527 extern struct vm_area_struct *gru_find_vma(unsigned long vaddr);
 528 extern void gru_flush_all_tlb(struct gru_state *gru);
 529 extern int gru_proc_init(void);
 530 extern void gru_proc_exit(void);
 531
 532 extern unsigned long reserve_gru_cb_resources(struct gru_state *gru,
 533                 int cbr_au_count, char *cbmap);
 534 extern unsigned long reserve_gru_ds_resources(struct gru_state *gru,
 535                 int dsr_au_count, char *dsmap);
 536 extern int gru_fault(struct vm_area_struct *, struct vm_fault *vmf);
 537 extern struct gru_mm_struct *gru_register_mmu_notifier(void);
 538 extern void gru_drop_mmu_notifier(struct gru_mm_struct *gms);
 539
 540 extern void gru_flush_tlb_range(struct gru_mm_struct *gms, unsigned long start,
 541                                         unsigned long len);
 542
 543 extern unsigned long options;
 544
 545 #endif /* __GRUTABLES_H__ */