bsd/dev/arm/sysctl.c

   1 /*
   2  * Copyright (c) 2003-2007 Apple Inc. All rights reserved.
   3  */
   4 #include <sys/param.h>
   5 #include <sys/kernel.h>
   6 #include <sys/sysctl.h>
   7
   8 #include <machine/machine_routines.h>
   9
  10 #include <mach/host_info.h>
  11 #include <mach/mach_host.h>
  12 #include <arm/cpuid.h>
  13 #include <libkern/libkern.h>
  14
  15 extern int      trap_on_alignment_fault;
  16 extern uint64_t wake_abstime;
  17 extern int      lck_mtx_adaptive_spin_mode;
  18
  19 static
  20 SYSCTL_INT(_machdep, OID_AUTO, alignmenttrap,
  21     CTLFLAG_RW, &trap_on_alignment_fault, 0,
  22     "trap on alignment faults (number of alignment faults per trap)");
  23
  24 static
  25 SYSCTL_QUAD(_machdep, OID_AUTO, wake_abstime,
  26     CTLFLAG_RD | CTLFLAG_KERN, &wake_abstime,
  27     "Absolute Time at the last wakeup");
  28
  29 static int
  30 sysctl_time_since_reset SYSCTL_HANDLER_ARGS
  31 {
  32 #pragma unused(arg1, arg2, oidp)
  33         int error = 0;
  34         uint64_t return_value = 0;
  35
  36         return_value = ml_get_time_since_reset();
  37
  38         SYSCTL_OUT(req, &return_value, sizeof(return_value));
  39
  40         return error;
  41 }
  42
  43 SYSCTL_PROC(_machdep, OID_AUTO, time_since_reset,
  44     CTLFLAG_RD | CTLTYPE_QUAD | CTLFLAG_LOCKED,
  45     0, 0, sysctl_time_since_reset, "I",
  46     "Continuous time since last SOC boot/wake started");
  47
  48 static int
  49 sysctl_wake_conttime SYSCTL_HANDLER_ARGS
  50 {
  51 #pragma unused(arg1, arg2, oidp)
  52         int error = 0;
  53         uint64_t return_value = 0;
  54
  55         return_value = ml_get_conttime_wake_time();
  56
  57         SYSCTL_OUT(req, &return_value, sizeof(return_value));
  58
  59         return error;
  60 }
  61
  62 SYSCTL_PROC(_machdep, OID_AUTO, wake_conttime,
  63     CTLFLAG_RD | CTLTYPE_QUAD | CTLFLAG_LOCKED,
  64     0, 0, sysctl_wake_conttime, "I",
  65     "Continuous Time at the last wakeup");
  66
  67 /*
  68  * For source compatibility, here's some machdep.cpu mibs that
  69  * use host_info() to simulate reasonable answers.
  70  */
  71
  72 SYSCTL_NODE(_machdep, OID_AUTO, cpu, CTLFLAG_RW | CTLFLAG_LOCKED, 0,
  73     "CPU info");
  74
  75 static int
  76 arm_host_info SYSCTL_HANDLER_ARGS
  77 {
  78         __unused struct sysctl_oid *unused_oidp = oidp;
  79
  80         host_basic_info_data_t hinfo;
  81         mach_msg_type_number_t count = HOST_BASIC_INFO_COUNT;
  82 #define BSD_HOST        1
  83         kern_return_t kret = host_info((host_t)BSD_HOST,
  84             HOST_BASIC_INFO, (host_info_t)&hinfo, &count);
  85         if (KERN_SUCCESS != kret) {
  86                 return EINVAL;
  87         }
  88
  89         if (sizeof(uint32_t) != arg2) {
  90                 panic("size mismatch");
  91         }
  92
  93         uintptr_t woffset = (uintptr_t)arg1 / sizeof(uint32_t);
  94         uint32_t datum = *(uint32_t *)(((uint32_t *)&hinfo) + woffset);
  95         return SYSCTL_OUT(req, &datum, sizeof(datum));
  96 }
  97
  98 /*
  99  * machdep.cpu.cores_per_package
 100  *
 101  * x86: derived from CPUID data.
 102  * ARM: how many physical cores we have in the AP; aka hw.physicalcpu_max
 103  */
 104 static
 105 SYSCTL_PROC(_machdep_cpu, OID_AUTO, cores_per_package,
 106     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_LOCKED,
 107     (void *)offsetof(host_basic_info_data_t, physical_cpu_max),
 108     sizeof(integer_t),
 109     arm_host_info, "I", "CPU cores per package");
 110
 111 /*
 112  * machdep.cpu.core_count
 113  *
 114  * x86: derived from CPUID data.
 115  * ARM: # active physical cores in the AP; aka hw.physicalcpu
 116  */
 117 static
 118 SYSCTL_PROC(_machdep_cpu, OID_AUTO, core_count,
 119     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_LOCKED,
 120     (void *)offsetof(host_basic_info_data_t, physical_cpu),
 121     sizeof(integer_t),
 122     arm_host_info, "I", "Number of enabled cores per package");
 123
 124 /*
 125  * machdep.cpu.logical_per_package
 126  *
 127  * x86: derived from CPUID data. Returns ENOENT if HTT bit not set, but
 128  *      most x64 CPUs have that, so assume it's available.
 129  * ARM: total # logical cores in the AP; aka hw.logicalcpu_max
 130  */
 131 static
 132 SYSCTL_PROC(_machdep_cpu, OID_AUTO, logical_per_package,
 133     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_LOCKED,
 134     (void *)offsetof(host_basic_info_data_t, logical_cpu_max),
 135     sizeof(integer_t),
 136     arm_host_info, "I", "CPU logical cpus per package");
 137
 138 /*
 139  * machdep.cpu.thread_count
 140  *
 141  * x86: derived from CPUID data.
 142  * ARM: # active logical cores in the AP; aka hw.logicalcpu
 143  */
 144 static
 145 SYSCTL_PROC(_machdep_cpu, OID_AUTO, thread_count,
 146     CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_LOCKED,
 147     (void *)offsetof(host_basic_info_data_t, logical_cpu),
 148     sizeof(integer_t),
 149     arm_host_info, "I", "Number of enabled threads per package");
 150
 151 /*
 152  * machdep.cpu.brand_string
 153  *
 154  * x86: derived from CPUID data.
 155  * ARM: cons something up from the CPUID register. Could include cpufamily
 156  *      here and map it to a "marketing" name, but there's no obvious need;
 157  *      the value is already exported via the commpage. So keep it simple.
 158  */
 159 static int
 160 make_brand_string SYSCTL_HANDLER_ARGS
 161 {
 162         __unused struct sysctl_oid *unused_oidp = oidp;
 163         __unused void *unused_arg1 = arg1;
 164         __unused int unused_arg2 = arg2;
 165
 166         const char *impl;
 167
 168         switch (cpuid_info()->arm_info.arm_implementor) {
 169         case CPU_VID_APPLE:
 170                 impl = "Apple";
 171                 break;
 172         case CPU_VID_ARM:
 173                 impl = "ARM";
 174                 break;
 175         default:
 176                 impl = "ARM architecture";
 177                 break;
 178         }
 179         char buf[80];
 180         snprintf(buf, sizeof(buf), "%s processor", impl);
 181         return SYSCTL_OUT(req, buf, strlen(buf) + 1);
 182 }
 183
 184 SYSCTL_PROC(_machdep_cpu, OID_AUTO, brand_string,
 185     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_LOCKED,
 186     0, 0, make_brand_string, "A", "CPU brand string");
 187
 188 static
 189 SYSCTL_INT(_machdep, OID_AUTO, lck_mtx_adaptive_spin_mode,
 190     CTLFLAG_RW, &lck_mtx_adaptive_spin_mode, 0,
 191     "Enable adaptive spin behavior for kernel mutexes");