sys/platform/vkernel64/platform/systimer.c

   1 /*
   2  * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  */
  35
  36 #include <sys/types.h>
  37 #include <sys/systm.h>
  38 #include <sys/kernel.h>
  39 #include <sys/systimer.h>
  40 #include <sys/sysctl.h>
  41 #include <sys/signal.h>
  42 #include <sys/interrupt.h>
  43 #include <sys/bus.h>
  44 #include <sys/time.h>
  45 #include <machine/cpu.h>
  46 #include <machine/clock.h>
  47 #include <machine/globaldata.h>
  48 #include <machine/md_var.h>
  49
  50 #include <sys/thread2.h>
  51
  52 #include <unistd.h>
  53 #include <signal.h>
  54
  55 #define VKTIMER_FREQ    1000000 /* 1us granularity */
  56
  57 static void vktimer_intr(void *dummy, struct intrframe *frame);
  58
  59 int disable_rtc_set;
  60 SYSCTL_INT(_machdep, CPU_DISRTCSET, disable_rtc_set,
  61            CTLFLAG_RW, &disable_rtc_set, 0, "");
  62 SYSCTL_INT(_hw, OID_AUTO, tsc_present, CTLFLAG_RD,
  63             &tsc_present, 0, "TSC Available");
  64 SYSCTL_INT(_hw, OID_AUTO, tsc_invariant, CTLFLAG_RD,
  65             &tsc_invariant, 0, "Invariant TSC");
  66 SYSCTL_INT(_hw, OID_AUTO, tsc_mpsync, CTLFLAG_RD,
  67             &tsc_mpsync, 0, "TSC is synchronized across CPUs");
  68 SYSCTL_QUAD(_hw, OID_AUTO, tsc_frequency, CTLFLAG_RD,
  69             &tsc_frequency, 0, "TSC Frequency");
  70
  71 int adjkerntz;
  72 int wall_cmos_clock = 0;
  73 SYSCTL_INT(_machdep, CPU_WALLCLOCK, wall_cmos_clock,
  74     CTLFLAG_RD, &wall_cmos_clock, 0, "");
  75
  76 static struct kqueue_info *kqueue_timer_info;
  77
  78 static int cputimer_mib[16];
  79 static int cputimer_miblen;
  80
  81 /*
  82  * SYSTIMER IMPLEMENTATION
  83  */
  84 static sysclock_t vkernel_timer_get_timecount(void);
  85 static void vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock);
  86
  87 static struct cputimer vkernel_cputimer = {
  88         SLIST_ENTRY_INITIALIZER,
  89         "VKERNEL",
  90         CPUTIMER_PRI_VKERNEL,
  91         CPUTIMER_VKERNEL,
  92         vkernel_timer_get_timecount,
  93         cputimer_default_fromhz,
  94         cputimer_default_fromus,
  95         vkernel_timer_construct,
  96         cputimer_default_destruct,
  97         VKTIMER_FREQ,
  98         0, 0, 0
  99 };
 100
 101 static void     vktimer_intr_reload(struct cputimer_intr *, sysclock_t);
 102 static void     vktimer_intr_initclock(struct cputimer_intr *, boolean_t);
 103
 104 static struct cputimer_intr vkernel_cputimer_intr = {
 105         .freq = VKTIMER_FREQ,
 106         .reload = vktimer_intr_reload,
 107         .enable = cputimer_intr_default_enable,
 108         .config = cputimer_intr_default_config,
 109         .restart = cputimer_intr_default_restart,
 110         .pmfixup = cputimer_intr_default_pmfixup,
 111         .initclock = vktimer_intr_initclock,
 112         .pcpuhand = NULL,
 113         .next = SLIST_ENTRY_INITIALIZER,
 114         .name = "vkernel",
 115         .type = CPUTIMER_INTR_VKERNEL,
 116         .prio = CPUTIMER_INTR_PRIO_VKERNEL,
 117         .caps = CPUTIMER_INTR_CAP_NONE,
 118         .priv = NULL
 119 };
 120
 121 /*
 122  * Initialize the systimer subsystem, called from MI code in early boot.
 123  */
 124 static void
 125 cpu_initclocks(void *arg __unused)
 126 {
 127         size_t len;
 128
 129         kprintf("initclocks\n");
 130         len = sizeof(vkernel_cputimer.freq);
 131         if (sysctlbyname("kern.cputimer.freq", &vkernel_cputimer.freq, &len,
 132                          NULL, 0) < 0) {
 133                 panic("cpu_initclocks: can't get kern.cputimer.freq!");
 134         }
 135         len = NELEM(cputimer_mib);
 136         if (sysctlnametomib("kern.cputimer.clock", cputimer_mib, &len) < 0)
 137                 panic("cpu_initclocks: can't get kern.cputimer.clock!");
 138         cputimer_miblen = len;
 139
 140         cputimer_intr_register(&vkernel_cputimer_intr);
 141         cputimer_intr_select(&vkernel_cputimer_intr, 0);
 142
 143         cputimer_register(&vkernel_cputimer);
 144         cputimer_select(&vkernel_cputimer, 0);
 145 }
 146 SYSINIT(clocksvk, SI_BOOT2_CLOCKREG, SI_ORDER_FIRST, cpu_initclocks, NULL);
 147
 148 /*
 149  * Constructor to initialize timer->base and get an initial count.
 150  */
 151 static void
 152 vkernel_timer_construct(struct cputimer *timer, sysclock_t oclock)
 153 {
 154         timer->base = 0;
 155         timer->base = oclock - vkernel_timer_get_timecount();
 156 }
 157
 158 /*
 159  * Get the current counter, with 2's complement rollover.
 160  *
 161  * NOTE! MPSAFE, possibly no critical section
 162  */
 163 static sysclock_t
 164 vkernel_timer_get_timecount(void)
 165 {
 166         sysclock_t counter;
 167         size_t len;
 168
 169         len = sizeof(counter);
 170         if (sysctl(cputimer_mib, cputimer_miblen, &counter, &len,
 171                    NULL, 0) < 0) {
 172                 panic("vkernel_timer_get_timecount: sysctl failed!");
 173         }
 174         return(counter);
 175 }
 176
 177 /*
 178  * Initialize the interrupt for our core systimer.  Use the kqueue timer
 179  * support functions.
 180  */
 181 static void
 182 vktimer_intr_initclock(struct cputimer_intr *cti __unused,
 183                        boolean_t selected __unused)
 184 {
 185         KKASSERT(kqueue_timer_info == NULL);
 186         kqueue_timer_info = kqueue_add_timer(vktimer_intr, NULL);
 187 }
 188
 189 /*
 190  * Reload the interrupt for our core systimer.  Because the caller's
 191  * reload calculation can be negatively indexed, we need a minimal
 192  * check to ensure that a reasonable reload value is selected.
 193  */
 194 static void
 195 vktimer_intr_reload(struct cputimer_intr *cti __unused, sysclock_t reload)
 196 {
 197         if (kqueue_timer_info) {
 198                 if ((int)reload < 1)
 199                         reload = 1;
 200                 kqueue_reload_timer(kqueue_timer_info, (reload + 999) / 1000);
 201         }
 202 }
 203
 204 /*
 205  * clock interrupt.
 206  *
 207  * NOTE: frame is a struct intrframe pointer.
 208  */
 209 static void
 210 vktimer_intr(void *dummy, struct intrframe *frame)
 211 {
 212         static sysclock_t sysclock_count;
 213         struct globaldata *gd = mycpu;
 214         struct globaldata *gscan;
 215         int n;
 216
 217         sysclock_count = sys_cputimer->count();
 218         for (n = 0; n < ncpus; ++n) {
 219                 gscan = globaldata_find(n);
 220                 if (TAILQ_FIRST(&gscan->gd_systimerq) == NULL)
 221                         continue;
 222                 if (gscan != gd) {
 223                         lwkt_send_ipiq3(gscan, (ipifunc3_t)systimer_intr,
 224                                         &sysclock_count, 0);
 225                 } else {
 226                         systimer_intr(&sysclock_count, 0, frame);
 227                 }
 228         }
 229 }
 230
 231 /*
 232  * Initialize the time of day register, based on the time base which is, e.g.
 233  * from a filesystem.
 234  */
 235 void
 236 inittodr(time_t base)
 237 {
 238         struct timespec ts;
 239         struct timeval tv;
 240
 241         gettimeofday(&tv, NULL);
 242         ts.tv_sec = tv.tv_sec;
 243         ts.tv_nsec = tv.tv_usec * 1000;
 244         set_timeofday(&ts);
 245 }
 246
 247 /*
 248  * Write system time back to the RTC
 249  */
 250 void
 251 resettodr(void)
 252 {
 253 }
 254
 255 /*
 256  * We need to enter a critical section to prevent signals from recursing
 257  * into pthreads.
 258  */
 259 void
 260 DELAY(int usec)
 261 {
 262         crit_enter();
 263         usleep(usec);
 264         crit_exit();
 265 }
 266
 267 void
 268 DRIVERSLEEP(int usec)
 269 {
 270         if (mycpu->gd_intr_nesting_level)
 271                 DELAY(usec);
 272         else if (1000000 / usec >= hz)
 273                 tsleep(DRIVERSLEEP, 0, "DELAY", 1000000 / usec / hz + 1);
 274         else
 275                 DELAY(usec);
 276 }