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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/param.h> 30 #include <sys/time.h> 31 #include <sys/systm.h> 32 #include <sys/cmn_err.h> 33 #include <sys/debug.h> 34 #include <sys/clock.h> 35 #include <sys/intreg.h> 36 #include <sys/x_call.h> 37 #include <sys/cpuvar.h> 38 #include <sys/promif.h> 39 #include <sys/mman.h> 40 #include <sys/sysmacros.h> 41 #include <sys/lockstat.h> 42 #include <vm/as.h> 43 #include <vm/hat.h> 44 #include <sys/intr.h> 45 #include <sys/ivintr.h> 46 #include <sys/machsystm.h> 47 #include <sys/reboot.h> 48 #include <sys/membar.h> 49 #include <sys/atomic.h> 50 #include <sys/cpu_module.h> 51 #include <sys/hypervisor_api.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 66 /* 67 * preset the delay constant for drv_usecwait(). This is done for early 68 * use of the le or scsi drivers in the kernel. The default contant 69 * might be too high early on. We can get a pretty good approximation 70 * of this by setting it as: 71 * 72 * sys_clock_mhz = (sys_tick_freq + 500000) / 1000000 73 * 74 * setcpudelay is called twice during the boot process. The first time 75 * is before the TOD driver is loaded so cpu_init_tick_freq cannot 76 * calibrate sys_tick_freq but can only set it to the prom value. The 77 * first call is also before /etc/system is read. 78 * 79 * Only call cpu_init_tick_freq the second time around if sys_tick_freq 80 * has not been tuned via /etc/system. 81 */ 82 void 83 setcpudelay(void) 84 { 85 static uint64_t sys_tick_freq_save = 0; 86 /* 87 * We want to allow cpu_tick_freq to be tunable; we'll only set it 88 * if it hasn't been explicitly tuned. 89 */ 90 if (cpu_tick_freq != 0) { 91 cmn_err(CE_WARN, "cpu_tick_freq is no longer a kernel " 92 "tunable, use sys_tick_freq instead"); 93 sys_tick_freq = cpu_tick_freq; 94 } 95 if (sys_tick_freq == sys_tick_freq_save) { 96 cpu_init_tick_freq(); 97 sys_tick_freq_save = sys_tick_freq; 98 } 99 ASSERT(sys_tick_freq != 0); 100 101 /* 102 * See the comments in clock.h for a full description of 103 * nsec_scale. The "& ~1" operation below ensures that 104 * nsec_scale is always even, so that for *any* value of 105 * %tick, multiplying by nsec_scale clears NPT for free. 106 */ 107 nsec_scale = (uint_t)(((u_longlong_t)NANOSEC << (32 - nsec_shift)) / 108 sys_tick_freq) & ~1; 109 110 /* 111 * scaled_clock_mhz is a more accurated (ie not rounded-off) 112 * version of sys_clock_mhz that we used to program the tick 113 * compare register. Just in case sys_tick_freq is like 142.5 Mhz 114 * instead of some whole number like 143 115 */ 116 117 scaled_clock_mhz = (sys_tick_freq) / 1000; 118 sys_clock_mhz = (sys_tick_freq + 500000) / 1000000; 119 120 nsec_per_sys_tick = NANOSEC / sys_tick_freq; 121 122 /* 123 * Pre-calculate number of sticks per usec for drv_usecwait. 124 */ 125 sticks_per_usec = MAX((sys_tick_freq + (MICROSEC - 1)) / MICROSEC, 1); 126 127 if (sys_clock_mhz <= 0) { 128 cmn_err(CE_WARN, "invalid system frequency"); 129 } 130 } 131 132 /* 133 * Hypervisor can return one of two error conditions 134 * for the TOD_GET API call. 1) H_ENOTSUPPORTED 2) H_EWOULDBLOCK 135 * 136 * To handle the H_ENOTSUPPORTED we return 0 seconds and let clkset 137 * set tod_broken. 138 * To handle the H_EWOULDBLOCK we retry for about 500usec and 139 * return hrestime if we can't successfully get a value. 140 */ 141 timestruc_t 142 tod_get(void) 143 { 144 timestruc_t ts; 145 uint64_t seconds; 146 int i; 147 unsigned int spl_old; 148 uint64_t ret; 149 /* 150 * Make sure we don't get preempted 151 * while getting the tod value. 152 * getting preempted could mean we always 153 * hit the hypervisor during an update 154 * and always get EWOULDBLOCK. 155 */ 156 157 spl_old = ddi_enter_critical(); 158 for (i = 0; i <= HV_TOD_RETRY_THRESH; i++) { 159 ret = hv_tod_get(&seconds); 160 161 if (ret != H_EWOULDBLOCK) 162 break; 163 drv_usecwait(HV_TOD_WAIT_USEC); 164 } 165 ddi_exit_critical(spl_old); 166 167 ts.tv_nsec = 0; 168 if (ret != H_EOK) { 169 170 switch (ret) { 171 default: 172 cmn_err(CE_WARN, 173 "tod_get: unknown error from hv_tod_get, %lx\n", 174 ret); 175 /*FALLTHRU*/ 176 case H_EWOULDBLOCK: 177 /* 178 * We timed out 179 */ 180 tod_fault_reset(); 181 ts.tv_sec = tod_validate(hrestime.tv_sec); 182 break; 183 184 case H_ENOTSUPPORTED: 185 ts.tv_sec = 0; 186 break; 187 }; 188 } else { 189 ts.tv_sec = tod_validate(seconds); 190 } 191 192 return (ts); 193 } 194 195 /*ARGSUSED*/ 196 void 197 tod_set(timestruc_t ts) 198 { 199 int i; 200 uint64_t ret; 201 202 tod_fault_reset(); 203 for (i = 0; i <= HV_TOD_RETRY_THRESH; i++) { 204 ret = hv_tod_set(ts.tv_sec); 205 if (ret != H_EWOULDBLOCK) 206 break; 207 drv_usecwait(HV_TOD_WAIT_USEC); 208 } 209 if (ret != H_EOK && ret != H_ENOTSUPPORTED && ret != H_EWOULDBLOCK) 210 cmn_err(CE_WARN, 211 "tod_set: Unknown error from hv_tod_set, err %lx", ret); 212 } 213 214 /* 215 * The following wrappers have been added so that locking 216 * can be exported to platform-independent clock routines 217 * (ie adjtime(), clock_setttime()), via a functional interface. 218 */ 219 int 220 hr_clock_lock(void) 221 { 222 ushort_t s; 223 224 CLOCK_LOCK(&s); 225 return (s); 226 } 227 228 void 229 hr_clock_unlock(int s) 230 { 231 CLOCK_UNLOCK(s); 232 } 233 234 /* 235 * We don't share the trap table with the prom, so we don't need 236 * to enable/disable its clock. 237 */ 238 void 239 mon_clock_init(void) 240 {} 241 242 void 243 mon_clock_start(void) 244 {} 245 246 void 247 mon_clock_stop(void) 248 {} 249 250 void 251 mon_clock_share(void) 252 {} 253 254 void 255 mon_clock_unshare(void) 256 {} 257