1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/param.h> 29 #include <sys/time.h> 30 #include <sys/systm.h> 31 #include <sys/cmn_err.h> 32 #include <sys/debug.h> 33 #include <sys/clock.h> 34 #include <sys/intreg.h> 35 #include <sys/x_call.h> 36 #include <sys/cpuvar.h> 37 #include <sys/promif.h> 38 #include <sys/mman.h> 39 #include <sys/sysmacros.h> 40 #include <sys/lockstat.h> 41 #include <vm/as.h> 42 #include <vm/hat.h> 43 #include <sys/intr.h> 44 #include <sys/ivintr.h> 45 #include <sys/machsystm.h> 46 #include <sys/reboot.h> 47 #include <sys/membar.h> 48 #include <sys/atomic.h> 49 #include <sys/cpu_module.h> 50 #include <sys/hypervisor_api.h> 51 #include <sys/wdt.h> 52 53 uint_t sys_clock_mhz = 0; 54 uint64_t sys_tick_freq = 0; 55 uint_t cpu_tick_freq = 0; /* deprecated, tune sys_tick_freq instead */ 56 uint_t scaled_clock_mhz = 0; 57 uint_t nsec_per_sys_tick; 58 uint_t sticks_per_usec; 59 char clock_started = 0; 60 61 void 62 clkstart(void) 63 { 64 /* 65 * Now is a good time to activate hardware watchdog. 66 */ 67 watchdog_init(); 68 } 69 70 /* 71 * preset the delay constant for drv_usecwait(). This is done for early 72 * use of the le or scsi drivers in the kernel. The default contant 73 * might be too high early on. We can get a pretty good approximation 74 * of this by setting it as: 75 * 76 * sys_clock_mhz = (sys_tick_freq + 500000) / 1000000 77 * 78 * setcpudelay is called twice during the boot process. The first time 79 * is before the TOD driver is loaded so cpu_init_tick_freq cannot 80 * calibrate sys_tick_freq but can only set it to the prom value. The 81 * first call is also before /etc/system is read. 82 * 83 * Only call cpu_init_tick_freq the second time around if sys_tick_freq 84 * has not been tuned via /etc/system. 85 */ 86 void 87 setcpudelay(void) 88 { 89 static uint64_t sys_tick_freq_save = 0; 90 /* 91 * We want to allow cpu_tick_freq to be tunable; we'll only set it 92 * if it hasn't been explicitly tuned. 93 */ 94 if (cpu_tick_freq != 0) { 95 cmn_err(CE_WARN, "cpu_tick_freq is no longer a kernel " 96 "tunable, use sys_tick_freq instead"); 97 sys_tick_freq = cpu_tick_freq; 98 } 99 if (sys_tick_freq == sys_tick_freq_save) { 100 cpu_init_tick_freq(); 101 sys_tick_freq_save = sys_tick_freq; 102 } 103 ASSERT(sys_tick_freq != 0); 104 105 /* 106 * See the comments in clock.h for a full description of 107 * nsec_scale. The "& ~1" operation below ensures that 108 * nsec_scale is always even, so that for *any* value of 109 * %tick, multiplying by nsec_scale clears NPT for free. 110 */ 111 nsec_scale = (uint_t)(((u_longlong_t)NANOSEC << (32 - nsec_shift)) / 112 sys_tick_freq) & ~1; 113 114 /* 115 * scaled_clock_mhz is a more accurated (ie not rounded-off) 116 * version of sys_clock_mhz that we used to program the tick 117 * compare register. Just in case sys_tick_freq is like 142.5 Mhz 118 * instead of some whole number like 143 119 */ 120 121 scaled_clock_mhz = (sys_tick_freq) / 1000; 122 sys_clock_mhz = (sys_tick_freq + 500000) / 1000000; 123 124 nsec_per_sys_tick = NANOSEC / sys_tick_freq; 125 126 /* 127 * Pre-calculate number of sticks per usec for drv_usecwait. 128 */ 129 sticks_per_usec = MAX((sys_tick_freq + (MICROSEC - 1)) / MICROSEC, 1); 130 131 if (sys_clock_mhz <= 0) { 132 cmn_err(CE_WARN, "invalid system frequency"); 133 } 134 } 135 136 /* 137 * Hypervisor can return one of two error conditions 138 * for the TOD_GET API call. 1) H_ENOTSUPPORTED 2) H_EWOULDBLOCK 139 * 140 * To handle the H_ENOTSUPPORTED we return 0 seconds and let clkset 141 * set tod_broken. 142 * To handle the H_EWOULDBLOCK we retry for about 500usec and 143 * return hrestime if we can't successfully get a value. 144 */ 145 timestruc_t 146 tod_get(void) 147 { 148 timestruc_t ts; 149 uint64_t seconds; 150 int i; 151 unsigned int spl_old; 152 uint64_t ret; 153 154 /* 155 * Make sure we don't get preempted 156 * while getting the tod value. 157 * getting preempted could mean we always 158 * hit the hypervisor during an update 159 * and always get EWOULDBLOCK. 160 */ 161 162 spl_old = ddi_enter_critical(); 163 for (i = 0; i <= HV_TOD_RETRY_THRESH; i++) { 164 ret = hv_tod_get(&seconds); 165 166 if (ret != H_EWOULDBLOCK) 167 break; 168 drv_usecwait(HV_TOD_WAIT_USEC); 169 } 170 ddi_exit_critical(spl_old); 171 172 ts.tv_nsec = 0; 173 if (ret != H_EOK) { 174 175 switch (ret) { 176 default: 177 cmn_err(CE_WARN, 178 "tod_get: unknown error from hv_tod_get, %lx\n", 179 ret); 180 /*FALLTHRU*/ 181 case H_EWOULDBLOCK: 182 /* 183 * We timed out 184 */ 185 tod_fault_reset(); 186 ts.tv_sec = tod_validate(hrestime.tv_sec); 187 break; 188 189 case H_ENOTSUPPORTED: 190 ts.tv_sec = 0; 191 break; 192 }; 193 } else { 194 ts.tv_sec = tod_validate(seconds); 195 } 196 197 return (ts); 198 } 199 200 /*ARGSUSED*/ 201 void 202 tod_set(timestruc_t ts) 203 { 204 int i; 205 uint64_t ret; 206 207 tod_fault_reset(); 208 for (i = 0; i <= HV_TOD_RETRY_THRESH; i++) { 209 ret = hv_tod_set(ts.tv_sec); 210 if (ret != H_EWOULDBLOCK) 211 break; 212 drv_usecwait(HV_TOD_WAIT_USEC); 213 } 214 if (ret != H_EOK && ret != H_ENOTSUPPORTED && ret != H_EWOULDBLOCK) 215 cmn_err(CE_WARN, 216 "tod_set: Unknown error from hv_tod_set, err %lx", ret); 217 } 218 219 /* 220 * The following wrappers have been added so that locking 221 * can be exported to platform-independent clock routines 222 * (ie adjtime(), clock_setttime()), via a functional interface. 223 */ 224 int 225 hr_clock_lock(void) 226 { 227 ushort_t s; 228 229 CLOCK_LOCK(&s); 230 return (s); 231 } 232 233 void 234 hr_clock_unlock(int s) 235 { 236 CLOCK_UNLOCK(s); 237 } 238 239 /* 240 * We don't share the trap table with the prom, so we don't need 241 * to enable/disable its clock. 242 */ 243 void 244 mon_clock_init(void) 245 {} 246 247 void 248 mon_clock_start(void) 249 {} 250 251 void 252 mon_clock_stop(void) 253 {} 254 255 void 256 mon_clock_share(void) 257 {} 258 259 void 260 mon_clock_unshare(void) 261 {} 262