osfmk/i386/cpu_data.h

   1 /*
   2  * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
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   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
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  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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  23  * Please see the License for the specific language governing rights and
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  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  *
  31  */
  32
  33 #ifndef I386_CPU_DATA
  34 #define I386_CPU_DATA
  35
  36 #include <mach_assert.h>
  37
  38 #include <kern/assert.h>
  39 #include <kern/kern_types.h>
  40 #include <kern/queue.h>
  41 #include <kern/processor.h>
  42 #include <kern/pms.h>
  43 #include <pexpert/pexpert.h>
  44 #include <mach/i386/thread_status.h>
  45 #include <mach/i386/vm_param.h>
  46 #include <i386/locks.h>
  47 #include <i386/rtclock_protos.h>
  48 #include <i386/pmCPU.h>
  49 #include <i386/cpu_topology.h>
  50
  51 #if CONFIG_VMX
  52 #include <i386/vmx/vmx_cpu.h>
  53 #endif
  54
  55 #include <machine/pal_routines.h>
  56
  57 /*
  58  * Data structures referenced (anonymously) from per-cpu data:
  59  */
  60 struct cpu_cons_buffer;
  61 struct cpu_desc_table;
  62 struct mca_state;
  63 struct prngContext;
  64
  65 /*
  66  * Data structures embedded in per-cpu data:
  67  */
  68 typedef struct rtclock_timer {
  69         mpqueue_head_t          queue;
  70         uint64_t                deadline;
  71         uint64_t                when_set;
  72         boolean_t               has_expired;
  73 } rtclock_timer_t;
  74
  75
  76 typedef struct {
  77         struct x86_64_tss       *cdi_ktss;
  78         struct __attribute__((packed)) {
  79                 uint16_t size;
  80                 void *ptr;
  81         } cdi_gdt, cdi_idt;
  82         struct fake_descriptor  *cdi_ldt;
  83         vm_offset_t             cdi_sstk;
  84 } cpu_desc_index_t;
  85
  86 typedef enum {
  87         TASK_MAP_32BIT,                 /* 32-bit user, compatibility mode */
  88         TASK_MAP_64BIT,                 /* 64-bit user thread, shared space */
  89 } task_map_t;
  90
  91
  92 /*
  93  * This structure is used on entry into the (uber-)kernel on syscall from
  94  * a 64-bit user. It contains the address of the machine state save area
  95  * for the current thread and a temporary place to save the user's rsp
  96  * before loading this address into rsp.
  97  */
  98 typedef struct {
  99         addr64_t        cu_isf;         /* thread->pcb->iss.isf */
 100         uint64_t        cu_tmp;         /* temporary scratch */
 101         addr64_t        cu_user_gs_base;
 102 } cpu_uber_t;
 103
 104 typedef uint16_t        pcid_t;
 105 typedef uint8_t         pcid_ref_t;
 106
 107 #define CPU_RTIME_BINS (12)
 108 #define CPU_ITIME_BINS (CPU_RTIME_BINS)
 109
 110 #define MAXPLFRAMES (32)
 111 typedef struct {
 112         boolean_t pltype;
 113         int plevel;
 114         uint64_t plbt[MAXPLFRAMES];
 115 } plrecord_t;
 116
 117 /*
 118  * Per-cpu data.
 119  *
 120  * Each processor has a per-cpu data area which is dereferenced through the
 121  * current_cpu_datap() macro. For speed, the %gs segment is based here, and
 122  * using this, inlines provides single-instruction access to frequently used
 123  * members - such as get_cpu_number()/cpu_number(), and get_active_thread()/
 124  * current_thread().
 125  *
 126  * Cpu data owned by another processor can be accessed using the
 127  * cpu_datap(cpu_number) macro which uses the cpu_data_ptr[] array of per-cpu
 128  * pointers.
 129  */
 130 typedef struct cpu_data
 131 {
 132         struct pal_cpu_data     cpu_pal_data;           /* PAL-specific data */
 133 #define                         cpu_pd cpu_pal_data     /* convenience alias */
 134         struct cpu_data         *cpu_this;              /* pointer to myself */
 135         thread_t                cpu_active_thread;
 136         thread_t                cpu_nthread;
 137         volatile int            cpu_preemption_level;
 138         int                     cpu_number;             /* Logical CPU */
 139         void                    *cpu_int_state;         /* interrupt state */
 140         vm_offset_t             cpu_active_stack;       /* kernel stack base */
 141         vm_offset_t             cpu_kernel_stack;       /* kernel stack top */
 142         vm_offset_t             cpu_int_stack_top;
 143         int                     cpu_interrupt_level;
 144         int                     cpu_phys_number;        /* Physical CPU */
 145         cpu_id_t                cpu_id;                 /* Platform Expert */
 146         volatile int            cpu_signals;            /* IPI events */
 147         volatile int            cpu_prior_signals;      /* Last set of events,
 148                                                          * debugging
 149                                                          */
 150         ast_t                   cpu_pending_ast;
 151         volatile int            cpu_running;
 152         boolean_t               cpu_fixed_pmcs_enabled;
 153         rtclock_timer_t         rtclock_timer;
 154         volatile addr64_t       cpu_active_cr3 __attribute((aligned(64)));
 155         union {
 156                 volatile uint32_t cpu_tlb_invalid;
 157                 struct {
 158                         volatile uint16_t cpu_tlb_invalid_local;
 159                         volatile uint16_t cpu_tlb_invalid_global;
 160                 };
 161         };
 162         volatile task_map_t     cpu_task_map;
 163         volatile addr64_t       cpu_task_cr3;
 164         addr64_t                cpu_kernel_cr3;
 165         boolean_t               cpu_pagezero_mapped;
 166         cpu_uber_t              cpu_uber;
 167         void                    *cpu_chud;
 168         void                    *cpu_console_buf;
 169         struct x86_lcpu         lcpu;
 170         struct processor        *cpu_processor;
 171 #if NCOPY_WINDOWS > 0
 172         struct cpu_pmap         *cpu_pmap;
 173 #endif
 174         struct cpu_desc_table   *cpu_desc_tablep;
 175         struct fake_descriptor  *cpu_ldtp;
 176         cpu_desc_index_t        cpu_desc_index;
 177         int                     cpu_ldt;
 178 #if NCOPY_WINDOWS > 0
 179         vm_offset_t             cpu_copywindow_base;
 180         uint64_t                *cpu_copywindow_pdp;
 181
 182         vm_offset_t             cpu_physwindow_base;
 183         uint64_t                *cpu_physwindow_ptep;
 184 #endif
 185
 186 #define HWINTCNT_SIZE 256
 187         uint32_t                cpu_hwIntCnt[HWINTCNT_SIZE];    /* Interrupt counts */
 188         uint64_t                cpu_hwIntpexits[HWINTCNT_SIZE];
 189         uint64_t                cpu_hwIntcexits[HWINTCNT_SIZE];
 190         uint64_t                cpu_dr7; /* debug control register */
 191         uint64_t                cpu_int_event_time;     /* intr entry/exit time */
 192         pal_rtc_nanotime_t      *cpu_nanotime;          /* Nanotime info */
 193 #if KPC
 194         /* double-buffered performance counter data */
 195         uint64_t                *cpu_kpc_buf[2];
 196         /* PMC shadow and reload value buffers */
 197         uint64_t                *cpu_kpc_shadow;
 198         uint64_t                *cpu_kpc_reload;
 199 #endif
 200         uint32_t                cpu_pmap_pcid_enabled;
 201         pcid_t                  cpu_active_pcid;
 202         pcid_t                  cpu_last_pcid;
 203         pcid_t                  cpu_kernel_pcid;
 204         volatile pcid_ref_t     *cpu_pmap_pcid_coherentp;
 205         volatile pcid_ref_t     *cpu_pmap_pcid_coherentp_kernel;
 206 #define PMAP_PCID_MAX_PCID      (0x1000)
 207         pcid_t                  cpu_pcid_free_hint;
 208         pcid_ref_t              cpu_pcid_refcounts[PMAP_PCID_MAX_PCID];
 209         pmap_t                  cpu_pcid_last_pmap_dispatched[PMAP_PCID_MAX_PCID];
 210 #ifdef  PCID_STATS
 211         uint64_t                cpu_pmap_pcid_flushes;
 212         uint64_t                cpu_pmap_pcid_preserves;
 213 #endif
 214         uint64_t                cpu_aperf;
 215         uint64_t                cpu_mperf;
 216         uint64_t                cpu_c3res;
 217         uint64_t                cpu_c6res;
 218         uint64_t                cpu_c7res;
 219         uint64_t                cpu_itime_total;
 220         uint64_t                cpu_rtime_total;
 221         uint64_t                cpu_ixtime;
 222         uint64_t                cpu_idle_exits;
 223         uint64_t                cpu_rtimes[CPU_RTIME_BINS];
 224         uint64_t                cpu_itimes[CPU_ITIME_BINS];
 225         uint64_t                cpu_cur_insns;
 226         uint64_t                cpu_cur_ucc;
 227         uint64_t                cpu_cur_urc;
 228         uint64_t                cpu_gpmcs[4];
 229         uint64_t                cpu_max_observed_int_latency;
 230         int                     cpu_max_observed_int_latency_vector;
 231         volatile boolean_t      cpu_NMI_acknowledged;
 232         uint64_t                debugger_entry_time;
 233         uint64_t                debugger_ipi_time;
 234         /* A separate nested interrupt stack flag, to account
 235          * for non-nested interrupts arriving while on the interrupt stack
 236          * Currently only occurs when AICPM enables interrupts on the
 237          * interrupt stack during processor offlining.
 238          */
 239         uint32_t                cpu_nested_istack;
 240         uint32_t                cpu_nested_istack_events;
 241         x86_saved_state64_t     *cpu_fatal_trap_state;
 242         x86_saved_state64_t     *cpu_post_fatal_trap_state;
 243 #if CONFIG_VMX
 244         vmx_cpu_t               cpu_vmx;                /* wonderful world of virtualization */
 245 #endif
 246 #if CONFIG_MCA
 247         struct mca_state        *cpu_mca_state;         /* State at MC fault */
 248 #endif
 249         struct prngContext      *cpu_prng;              /* PRNG's context */
 250         int                     cpu_type;
 251         int                     cpu_subtype;
 252         int                     cpu_threadtype;
 253         boolean_t               cpu_iflag;
 254         boolean_t               cpu_boot_complete;
 255         int                     cpu_hibernate;
 256 #define MAX_PREEMPTION_RECORDS (128)
 257 #if     DEVELOPMENT || DEBUG
 258         int                     cpu_plri;
 259         plrecord_t              plrecords[MAX_PREEMPTION_RECORDS];
 260 #endif
 261 } cpu_data_t;
 262
 263 extern cpu_data_t       *cpu_data_ptr[];
 264
 265 /* Macro to generate inline bodies to retrieve per-cpu data fields. */
 266 #if defined(__clang__)
 267 #define GS_RELATIVE volatile __attribute__((address_space(256)))
 268 #ifndef offsetof
 269 #define offsetof(TYPE,MEMBER) __builtin_offsetof(TYPE,MEMBER)
 270 #endif
 271
 272 #define CPU_DATA_GET(member,type)                                                                               \
 273         cpu_data_t GS_RELATIVE *cpu_data =                                                      \
 274                 (cpu_data_t GS_RELATIVE *)0UL;                                                                  \
 275         type ret;                                                                                                                       \
 276         ret = cpu_data->member;                                                                                         \
 277         return ret;
 278
 279 #define CPU_DATA_GET_INDEX(member,index,type)                                                   \
 280         cpu_data_t GS_RELATIVE *cpu_data =                                                      \
 281                 (cpu_data_t GS_RELATIVE *)0UL;                                                                  \
 282         type ret;                                                                                                                       \
 283         ret = cpu_data->member[index];                                                                          \
 284         return ret;
 285
 286 #define CPU_DATA_SET(member,value)                                                                              \
 287         cpu_data_t GS_RELATIVE *cpu_data =                                                      \
 288                 (cpu_data_t GS_RELATIVE *)0UL;                                                                  \
 289         cpu_data->member = value;
 290
 291 #define CPU_DATA_XCHG(member,value,type)                                                                \
 292         cpu_data_t GS_RELATIVE *cpu_data =                                                      \
 293                 (cpu_data_t GS_RELATIVE *)0UL;                                                                  \
 294         type ret;                                                                                                                       \
 295         ret = cpu_data->member;                                                                                         \
 296         cpu_data->member = value;                                                                                       \
 297         return ret;
 298
 299 #else /* !defined(__clang__) */
 300
 301 #ifndef offsetof
 302 #define offsetof(TYPE,MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
 303 #endif /* offsetof */
 304 #define CPU_DATA_GET(member,type)                                       \
 305         type ret;                                                       \
 306         __asm__ volatile ("mov %%gs:%P1,%0"                             \
 307                 : "=r" (ret)                                            \
 308                 : "i" (offsetof(cpu_data_t,member)));                   \
 309         return ret;
 310
 311 #define CPU_DATA_GET_INDEX(member,index,type)   \
 312         type ret;                                                       \
 313         __asm__ volatile ("mov %%gs:(%1),%0"                            \
 314                 : "=r" (ret)                                            \
 315                 : "r" (offsetof(cpu_data_t,member[index])));                    \
 316         return ret;
 317
 318 #define CPU_DATA_SET(member,value)                                      \
 319         __asm__ volatile ("mov %0,%%gs:%P1"                             \
 320                 :                                                       \
 321                 : "r" (value), "i" (offsetof(cpu_data_t,member)));
 322
 323 #define CPU_DATA_XCHG(member,value,type)                                \
 324         type ret;                                                       \
 325         __asm__ volatile ("xchg %0,%%gs:%P1"                            \
 326                 : "=r" (ret)                                            \
 327                 : "i" (offsetof(cpu_data_t,member)), "0" (value));      \
 328         return ret;
 329
 330 #endif /* !defined(__clang__) */
 331
 332 /*
 333  * Everyone within the osfmk part of the kernel can use the fast
 334  * inline versions of these routines.  Everyone outside, must call
 335  * the real thing,
 336  */
 337 static inline thread_t
 338 get_active_thread(void)
 339 {
 340         CPU_DATA_GET(cpu_active_thread,thread_t)
 341 }
 342 #define current_thread_fast()           get_active_thread()
 343 #define current_thread()                current_thread_fast()
 344
 345 #define cpu_mode_is64bit()              TRUE
 346
 347 static inline int
 348 get_preemption_level(void)
 349 {
 350         CPU_DATA_GET(cpu_preemption_level,int)
 351 }
 352 static inline int
 353 get_interrupt_level(void)
 354 {
 355         CPU_DATA_GET(cpu_interrupt_level,int)
 356 }
 357 static inline int
 358 get_cpu_number(void)
 359 {
 360         CPU_DATA_GET(cpu_number,int)
 361 }
 362 static inline int
 363 get_cpu_phys_number(void)
 364 {
 365         CPU_DATA_GET(cpu_phys_number,int)
 366 }
 367
 368 static inline cpu_data_t *
 369 current_cpu_datap(void) {
 370         CPU_DATA_GET(cpu_this, cpu_data_t *);
 371 }
 372
 373 /*
 374  * Facility to diagnose preemption-level imbalances, which are otherwise
 375  * challenging to debug. On each operation that enables or disables preemption,
 376  * we record a backtrace into a per-CPU ring buffer, along with the current
 377  * preemption level and operation type. Thus, if an imbalance is observed,
 378  * one can examine these per-CPU records to determine which codepath failed
 379  * to re-enable preemption, enabled premption without a corresponding
 380  * disablement etc. The backtracer determines which stack is currently active,
 381  * and uses that to perform bounds checks on unterminated stacks.
 382  * To enable, sysctl -w machdep.pltrace=1 on DEVELOPMENT or DEBUG kernels (DRK '15)
 383  * The bounds check currently doesn't account for non-default thread stack sizes.
 384  */
 385 #if DEVELOPMENT || DEBUG
 386 static inline void pltrace_bt(uint64_t *rets, int maxframes, uint64_t stacklo, uint64_t stackhi) {
 387         uint64_t *cfp = (uint64_t *) __builtin_frame_address(0);
 388         int plbtf;
 389
 390         assert(stacklo !=0  && stackhi !=0);
 391
 392         for (plbtf = 0; plbtf < maxframes; plbtf++) {
 393                 if (((uint64_t)cfp == 0) || (((uint64_t)cfp < stacklo) || ((uint64_t)cfp > stackhi))) {
 394                         rets[plbtf] = 0;
 395                         continue;
 396                 }
 397                 rets[plbtf] = *(cfp + 1);
 398                 cfp = (uint64_t *) (*cfp);
 399         }
 400 }
 401
 402
 403 extern uint32_t         low_intstack[];         /* bottom */
 404 extern uint32_t         low_eintstack[];        /* top */
 405 extern char             mp_slave_stack[PAGE_SIZE];
 406
 407 static inline void pltrace_internal(boolean_t enable) {
 408         cpu_data_t *cdata = current_cpu_datap();
 409         int cpli = cdata->cpu_preemption_level;
 410         int cplrecord = cdata->cpu_plri;
 411         uint64_t kstackb, kstackt, *plbts;
 412
 413         assert(cpli >= 0);
 414
 415         cdata->plrecords[cplrecord].pltype = enable;
 416         cdata->plrecords[cplrecord].plevel = cpli;
 417
 418         plbts = &cdata->plrecords[cplrecord].plbt[0];
 419
 420         cplrecord++;
 421
 422         if (cplrecord >= MAX_PREEMPTION_RECORDS) {
 423                 cplrecord = 0;
 424         }
 425
 426         cdata->cpu_plri = cplrecord;
 427         /* Obtain the 'current' program counter, initial backtrace
 428          * element. This will also indicate if we were unable to
 429          * trace further up the stack for some reason
 430          */
 431         __asm__ volatile("leaq 1f(%%rip), %%rax; mov %%rax, %0\n1:"
 432             : "=m" (plbts[0])
 433             :
 434             : "rax");
 435
 436
 437         thread_t cplthread = cdata->cpu_active_thread;
 438         if (cplthread) {
 439                 uintptr_t csp;
 440                 __asm__ __volatile__ ("movq %%rsp, %0": "=r" (csp):);
 441                 /* Determine which stack we're on to populate stack bounds.
 442                  * We don't need to trace across stack boundaries for this
 443                  * routine.
 444                  */
 445                 kstackb = cdata->cpu_active_stack;
 446                 kstackt = kstackb + KERNEL_STACK_SIZE;
 447                 if (csp < kstackb || csp > kstackt) {
 448                         kstackt = cdata->cpu_kernel_stack;
 449                         kstackb = kstackb - KERNEL_STACK_SIZE;
 450                         if (csp < kstackb || csp > kstackt) {
 451                                 kstackt = cdata->cpu_int_stack_top;
 452                                 kstackb = kstackt - INTSTACK_SIZE;
 453                                 if (csp < kstackb || csp > kstackt) {
 454                                         kstackt = (uintptr_t)low_eintstack;
 455                                         kstackb = (uintptr_t)low_eintstack - INTSTACK_SIZE;
 456                                         if (csp < kstackb || csp > kstackt) {
 457                                                 kstackb = (uintptr_t) mp_slave_stack;
 458                                                 kstackt = (uintptr_t) mp_slave_stack + PAGE_SIZE;
 459                                         }
 460                                 }
 461                         }
 462                 }
 463
 464                 if (kstackb) {
 465                         pltrace_bt(&plbts[1], MAXPLFRAMES - 1, kstackb, kstackt);
 466                 }
 467         }
 468 }
 469
 470 extern int plctrace_enabled;
 471 #endif /* DEVELOPMENT || DEBUG */
 472
 473 static inline void pltrace(boolean_t plenable) {
 474 #if DEVELOPMENT || DEBUG
 475         if (__improbable(plctrace_enabled != 0)) {
 476                 pltrace_internal(plenable);
 477         }
 478 #else
 479         (void)plenable;
 480 #endif
 481 }
 482
 483 static inline void
 484 disable_preemption_internal(void) {
 485         assert(get_preemption_level() >= 0);
 486
 487 #if defined(__clang__)
 488         cpu_data_t GS_RELATIVE *cpu_data = (cpu_data_t GS_RELATIVE *)0UL;
 489         cpu_data->cpu_preemption_level++;
 490 #else
 491         __asm__ volatile ("incl %%gs:%P0"
 492             :
 493             : "i" (offsetof(cpu_data_t, cpu_preemption_level)));
 494 #endif
 495         pltrace(FALSE);
 496 }
 497
 498 static inline void
 499 enable_preemption_internal(void) {
 500         assert(get_preemption_level() > 0);
 501         pltrace(TRUE);
 502 #if defined(__clang__)
 503         cpu_data_t GS_RELATIVE *cpu_data = (cpu_data_t GS_RELATIVE *)0UL;
 504         if (0 == --cpu_data->cpu_preemption_level)
 505                 kernel_preempt_check();
 506 #else
 507         __asm__ volatile ("decl %%gs:%P0                \n\t"
 508                           "jne 1f                       \n\t"
 509                           "call _kernel_preempt_check   \n\t"
 510                           "1:"
 511                         : /* no outputs */
 512                         : "i" (offsetof(cpu_data_t, cpu_preemption_level))
 513                         : "eax", "ecx", "edx", "cc", "memory");
 514 #endif
 515 }
 516
 517 static inline void
 518 enable_preemption_no_check(void)
 519 {
 520         assert(get_preemption_level() > 0);
 521
 522         pltrace(TRUE);
 523 #if defined(__clang__)
 524         cpu_data_t GS_RELATIVE *cpu_data = (cpu_data_t GS_RELATIVE *)0UL;
 525         cpu_data->cpu_preemption_level--;
 526 #else
 527         __asm__ volatile ("decl %%gs:%P0"
 528                         : /* no outputs */
 529                         : "i" (offsetof(cpu_data_t, cpu_preemption_level))
 530                         : "cc", "memory");
 531 #endif
 532 }
 533
 534 static inline void
 535 _enable_preemption_no_check(void) {
 536         enable_preemption_no_check();
 537 }
 538
 539 static inline void
 540 mp_disable_preemption(void)
 541 {
 542         disable_preemption_internal();
 543 }
 544
 545 static inline void
 546 _mp_disable_preemption(void)
 547 {
 548         disable_preemption_internal();
 549 }
 550
 551 static inline void
 552 mp_enable_preemption(void)
 553 {
 554         enable_preemption_internal();
 555 }
 556
 557 static inline void
 558 _mp_enable_preemption(void) {
 559         enable_preemption_internal();
 560 }
 561
 562 static inline void
 563 mp_enable_preemption_no_check(void) {
 564         enable_preemption_no_check();
 565 }
 566
 567 static inline void
 568 _mp_enable_preemption_no_check(void) {
 569         enable_preemption_no_check();
 570 }
 571
 572 #ifdef XNU_KERNEL_PRIVATE
 573 #define disable_preemption() disable_preemption_internal()
 574 #define enable_preemption() enable_preemption_internal()
 575 #define MACHINE_PREEMPTION_MACROS (1)
 576 #endif
 577
 578
 579 static inline cpu_data_t *
 580 cpu_datap(int cpu) {
 581         return cpu_data_ptr[cpu];
 582 }
 583
 584 extern cpu_data_t *cpu_data_alloc(boolean_t is_boot_cpu);
 585 extern void cpu_data_realloc(void);
 586
 587 #endif  /* I386_CPU_DATA */