/* * Copyright (c) 2007, 2008 Rui Paulo * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD: src/sys/dev/coretemp/coretemp.c,v 1.14 2011/05/05 19:15:15 delphij Exp $ */ /* * Device driver for Intel's On Die thermal sensor via MSR. * First introduced in Intel's Core line of processors. */ #include #include #include #include #include #include #include #include #include /* for curthread */ #include #include #include #include #include struct coretemp_softc { struct ksensordev sc_sensordev; struct ksensor sc_sensor; device_t sc_dev; int sc_tjmax; }; /* * Device methods. */ static void coretemp_identify(driver_t *driver, device_t parent); static int coretemp_probe(device_t dev); static int coretemp_attach(device_t dev); static int coretemp_detach(device_t dev); static int coretemp_get_temp(device_t dev); static void coretemp_refresh(void *arg); static device_method_t coretemp_methods[] = { /* Device interface */ DEVMETHOD(device_identify, coretemp_identify), DEVMETHOD(device_probe, coretemp_probe), DEVMETHOD(device_attach, coretemp_attach), DEVMETHOD(device_detach, coretemp_detach), DEVMETHOD_END }; static driver_t coretemp_driver = { "coretemp", coretemp_methods, sizeof(struct coretemp_softc), }; static devclass_t coretemp_devclass; DRIVER_MODULE(coretemp, cpu, coretemp_driver, coretemp_devclass, NULL, NULL); static void coretemp_identify(driver_t *driver, device_t parent) { device_t child; u_int regs[4]; /* Make sure we're not being doubly invoked. */ if (device_find_child(parent, "coretemp", -1) != NULL) return; /* Check that CPUID 0x06 is supported and the vendor is Intel.*/ if (cpu_high < 6 || cpu_vendor_id != CPU_VENDOR_INTEL) return; /* * CPUID 0x06 returns 1 if the processor has on-die thermal * sensors. EBX[0:3] contains the number of sensors. */ do_cpuid(0x06, regs); if ((regs[0] & 0x1) != 1) return; /* * We add a child for each CPU since settings must be performed * on each CPU in the SMP case. */ child = device_add_child(parent, "coretemp", -1); if (child == NULL) device_printf(parent, "add coretemp child failed\n"); } static int coretemp_probe(device_t dev) { if (resource_disabled("coretemp", 0)) return (ENXIO); device_set_desc(dev, "CPU On-Die Thermal Sensors"); return (BUS_PROBE_GENERIC); } static int coretemp_attach(device_t dev) { struct coretemp_softc *sc = device_get_softc(dev); device_t pdev; uint64_t msr; int cpu_model, cpu_stepping; int ret, tjtarget; sc->sc_dev = dev; pdev = device_get_parent(dev); cpu_model = CPUID_TO_MODEL(cpu_id); cpu_stepping = cpu_id & CPUID_STEPPING; /* * Some CPUs, namely the PIII, don't have thermal sensors, but * report them when the CPUID check is performed in * coretemp_identify(). This leads to a later GPF when the sensor * is queried via a MSR, so we stop here. */ if (cpu_model < 0xe) return (ENXIO); #if 0 /* * XXXrpaulo: I have this CPU model and when it returns from C3 * coretemp continues to function properly. */ /* * Check for errata AE18. * "Processor Digital Thermal Sensor (DTS) Readout stops * updating upon returning from C3/C4 state." * * Adapted from the Linux coretemp driver. */ if (cpu_model == 0xe && cpu_stepping < 0xc) { msr = rdmsr(MSR_BIOS_SIGN); msr = msr >> 32; if (msr < 0x39) { device_printf(dev, "not supported (Intel errata " "AE18), try updating your BIOS\n"); return (ENXIO); } } #endif /* * Use 100C as the initial value. */ sc->sc_tjmax = 100; if ((cpu_model == 0xf && cpu_stepping >= 2) || cpu_model == 0xe) { /* * On some Core 2 CPUs, there's an undocumented MSR that * can tell us if Tj(max) is 100 or 85. * * The if-clause for CPUs having the MSR_IA32_EXT_CONFIG was adapted * from the Linux coretemp driver. */ msr = rdmsr(MSR_IA32_EXT_CONFIG); if (msr & (1 << 30)) sc->sc_tjmax = 85; } else if (cpu_model == 0x17) { switch (cpu_stepping) { case 0x6: /* Mobile Core 2 Duo */ sc->sc_tjmax = 105; break; default: /* Unknown stepping */ break; } } else if (cpu_model == 0x1c) { switch (cpu_stepping) { case 0xa: /* 45nm Atom D400, N400 and D500 series */ sc->sc_tjmax = 100; break; default: sc->sc_tjmax = 90; break; } } else { /* * Attempt to get Tj(max) from MSR IA32_TEMPERATURE_TARGET. * * This method is described in Intel white paper "CPU * Monitoring With DTS/PECI". (#322683) */ ret = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &msr); if (ret == 0) { tjtarget = (msr >> 16) & 0xff; /* * On earlier generation of processors, the value * obtained from IA32_TEMPERATURE_TARGET register is * an offset that needs to be summed with a model * specific base. It is however not clear what * these numbers are, with the publicly available * documents from Intel. * * For now, we consider [70, 100]C range, as * described in #322683, as "reasonable" and accept * these values whenever the MSR is available for * read, regardless the CPU model. */ if (tjtarget >= 70 && tjtarget <= 100) sc->sc_tjmax = tjtarget; else device_printf(dev, "Tj(target) value %d " "does not seem right.\n", tjtarget); } else device_printf(dev, "Can not get Tj(target) " "from your CPU, using 100C.\n"); } if (bootverbose) device_printf(dev, "Setting TjMax=%d\n", sc->sc_tjmax); /* * Add hw.sensors.cpuN.temp0 MIB. */ strlcpy(sc->sc_sensordev.xname, device_get_nameunit(pdev), sizeof(sc->sc_sensordev.xname)); sc->sc_sensor.type = SENSOR_TEMP; sensor_attach(&sc->sc_sensordev, &sc->sc_sensor); if (sensor_task_register(sc, coretemp_refresh, 2)) { device_printf(dev, "unable to register update task\n"); return (ENXIO); } sensordev_install(&sc->sc_sensordev); return (0); } static int coretemp_detach(device_t dev) { struct coretemp_softc *sc = device_get_softc(dev); sensordev_deinstall(&sc->sc_sensordev); sensor_task_unregister(sc); return (0); } static int coretemp_get_temp(device_t dev) { uint64_t msr; int temp, cpu, origcpu; struct coretemp_softc *sc = device_get_softc(dev); char stemp[16]; cpu = device_get_unit(device_get_parent(dev)); /* * Bind to specific CPU to read the correct temperature. * If not all CPUs are initialised, then only read from * cpu0, returning -1 on all other CPUs. */ if (ncpus > 1) { origcpu = mycpuid; lwkt_migratecpu(cpu); msr = rdmsr(MSR_THERM_STATUS); lwkt_migratecpu(origcpu); } else if (cpu != 0) return (-1); else msr = rdmsr(MSR_THERM_STATUS); /* * Check for Thermal Status and Thermal Status Log. */ if ((msr & 0x3) == 0x3) device_printf(dev, "PROCHOT asserted\n"); /* * Bit 31 contains "Reading valid" */ if (((msr >> 31) & 0x1) == 1) { /* * Starting on bit 16 and ending on bit 22. */ temp = sc->sc_tjmax - ((msr >> 16) & 0x7f); } else temp = -1; /* * Check for Critical Temperature Status and Critical * Temperature Log. * It doesn't really matter if the current temperature is * invalid because the "Critical Temperature Log" bit will * tell us if the Critical Temperature has been reached in * past. It's not directly related to the current temperature. * * If we reach a critical level, allow devctl(4) to catch this * and shutdown the system. */ if (((msr >> 4) & 0x3) == 0x3) { device_printf(dev, "critical temperature detected, " "suggest system shutdown\n"); ksnprintf(stemp, sizeof(stemp), "%d", temp); devctl_notify("coretemp", "Thermal", stemp, "notify=0xcc"); } return (temp); } static void coretemp_refresh(void *arg) { struct coretemp_softc *sc = arg; device_t dev = sc->sc_dev; struct ksensor *s = &sc->sc_sensor; int temp; temp = coretemp_get_temp(dev); if (temp == -1) { s->flags |= SENSOR_FINVALID; s->value = 0; } else { s->flags &= ~SENSOR_FINVALID; s->value = temp * 1000000 + 273150000; } }