osfmk/kperf/kperf.c

   1 /*
   2  * Copyright (c) 2011 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   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,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  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,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 #include <mach/mach_types.h>
  29 #include <kern/thread.h>
  30 #include <kern/machine.h>
  31 #include <kern/kalloc.h>
  32 #include <sys/errno.h>
  33
  34 #include <kperf/sample.h>
  35 #include <kperf/pet.h>
  36 #include <kperf/action.h>
  37 #include <kperf/kperf.h>
  38 #include <kperf/timetrigger.h>
  39
  40 #include <kern/ipc_tt.h> /* port_name_to_task */
  41
  42 /** misc functions **/
  43 #include <chud/chud_xnu.h> /* XXX: should bust this out */
  44
  45 /* thread on CPUs before starting the PET thread */
  46 thread_t *kperf_thread_on_cpus = NULL;
  47
  48 /* interupt sample buffers -- one wired per CPU */
  49 static struct kperf_sample *intr_samplev = NULL;
  50 static unsigned intr_samplec = 0;
  51
  52 /* track recursion in the trace code */
  53 static struct
  54 {
  55         int active;
  56         int pad[64 / sizeof(int)];
  57 } *kpdbg_recursev;
  58 static unsigned kpdbg_recursec = 0;
  59
  60 /* Curren sampling status */
  61 static unsigned sampling_status = KPERF_SAMPLING_OFF;
  62
  63 /* Make sure we only init once */
  64 static unsigned kperf_initted = 0;
  65
  66 extern void (*chudxnu_thread_ast_handler)(thread_t);
  67
  68 struct kperf_sample*
  69 kperf_intr_sample_buffer(void)
  70 {
  71         unsigned ncpu = chudxnu_cpu_number();
  72
  73         // XXX: assert?
  74         if( ncpu >= intr_samplec )
  75                 return NULL;
  76
  77         return &intr_samplev[ncpu];
  78 }
  79
  80 int
  81 kperf_kdbg_recurse(int step)
  82 {
  83         unsigned ncpu = chudxnu_cpu_number();
  84
  85         // XXX: assert?
  86         if( ncpu >= kpdbg_recursec )
  87                 return 1;
  88
  89         /* recursing in, available */
  90         if( (step > 0)
  91             && (kpdbg_recursev[ncpu].active == 0) )
  92         {
  93                 kpdbg_recursev[ncpu].active = 1;
  94                 return 0;
  95         }
  96
  97         /* recursing in, unavailable */
  98         if( (step > 0)
  99             && (kpdbg_recursev[ncpu].active != 0) )
 100         {
 101                 return 1;
 102         }
 103
 104         /* recursing out, unavailable */
 105         if( (step < 0)
 106             && (kpdbg_recursev[ncpu].active != 0) )
 107         {
 108                 kpdbg_recursev[ncpu].active = 0;
 109                 return 0;
 110         }
 111
 112         /* recursing out, available */
 113         if( (step < 0)
 114             && (kpdbg_recursev[ncpu].active == 0) )
 115                 panic( "return from non-recursed kperf kdebug call" );
 116
 117         panic( "unknown kperf kdebug call" );
 118         return 1;
 119 }
 120
 121 /* setup interrupt sample buffers */
 122 int
 123 kperf_init(void)
 124 {
 125         unsigned ncpus = 0;
 126         int err;
 127
 128         if( kperf_initted )
 129                 return 0;
 130
 131         /* get number of cpus */
 132         ncpus = machine_info.logical_cpu_max;
 133
 134         kperf_thread_on_cpus = kalloc( ncpus * sizeof(*kperf_thread_on_cpus) );
 135         if( kperf_thread_on_cpus == NULL )
 136         {
 137                 err = ENOMEM;
 138                 goto error;
 139         }
 140
 141         /* clear it */
 142         bzero( kperf_thread_on_cpus, ncpus * sizeof(*kperf_thread_on_cpus) );
 143
 144         /* make the CPU array
 145          * FIXME: cache alignment
 146          */
 147         intr_samplev = kalloc( ncpus * sizeof(*intr_samplev));
 148         intr_samplec = ncpus;
 149
 150         if( intr_samplev == NULL )
 151         {
 152                 err = ENOMEM;
 153                 goto error;
 154         }
 155
 156         /* clear it */
 157         bzero( intr_samplev, ncpus * sizeof(*intr_samplev) );
 158
 159         /* make the recursion array */
 160         kpdbg_recursev = kalloc( ncpus * sizeof(*kpdbg_recursev));
 161         kpdbg_recursec = ncpus;
 162
 163         /* clear it */
 164         bzero( kpdbg_recursev, ncpus * sizeof(*kpdbg_recursev) );
 165
 166         /* we're done */
 167         kperf_initted = 1;
 168
 169         return 0;
 170 error:
 171         if( intr_samplev )
 172                 kfree( intr_samplev, ncpus * sizeof(*intr_samplev) );
 173         if( kperf_thread_on_cpus )
 174                 kfree( kperf_thread_on_cpus, ncpus * sizeof(*kperf_thread_on_cpus) );
 175         return err;
 176 }
 177
 178 /* random misc-ish functions */
 179 uint32_t
 180 kperf_get_thread_bits( thread_t thread )
 181 {
 182         return thread->t_chud;
 183 }
 184
 185 void
 186 kperf_set_thread_bits( thread_t thread, uint32_t bits )
 187 {
 188         thread->t_chud = bits;
 189 }
 190
 191 /* mark an AST to fire on a thread */
 192 void
 193 kperf_set_thread_ast( thread_t thread )
 194 {
 195         /* FIXME: only call this on current thread from an interrupt
 196          * handler for now...
 197          */
 198         if( thread != current_thread() )
 199                 panic( "unsafe AST set" );
 200
 201         act_set_kperf(thread);
 202 }
 203
 204 unsigned
 205 kperf_sampling_status(void)
 206 {
 207         return sampling_status;
 208 }
 209
 210 int
 211 kperf_sampling_enable(void)
 212 {
 213         /* already running! */
 214         if( sampling_status == KPERF_SAMPLING_ON )
 215                 return 0;
 216
 217         if ( sampling_status != KPERF_SAMPLING_OFF )
 218                 panic( "kperf: sampling wasn't off" );
 219
 220         /* make sure interrupt tables and actions are initted */
 221         if( !kperf_initted
 222             || (kperf_action_get_count() == 0) )
 223                 return ECANCELED;
 224
 225         /* mark as running */
 226         sampling_status = KPERF_SAMPLING_ON;
 227
 228         /* tell timers to enable */
 229         kperf_timer_go();
 230
 231         return 0;
 232 }
 233
 234 int
 235 kperf_sampling_disable(void)
 236 {
 237         if( sampling_status != KPERF_SAMPLING_ON )
 238                 return 0;
 239
 240         /* mark a shutting down */
 241         sampling_status = KPERF_SAMPLING_SHUTDOWN;
 242
 243         /* tell timers to disable */
 244         kperf_timer_stop();
 245
 246         /* mark as off */
 247         sampling_status = KPERF_SAMPLING_OFF;
 248
 249         return 0;
 250 }
 251
 252 int
 253 kperf_port_to_pid(mach_port_name_t portname)
 254 {
 255         task_t task;
 256         int pid;
 257
 258         if( !MACH_PORT_VALID(portname) )
 259                 return -1;
 260
 261         task = port_name_to_task(portname);
 262
 263         if( task == TASK_NULL )
 264                 return -1;
 265
 266
 267         pid = chudxnu_pid_for_task(task);
 268
 269         task_deallocate_internal(task);
 270
 271         return pid;
 272 }