/*- * 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. */ /* * Device driver for Intel's On Die thermal sensor via MSR. * First introduced in Intel's Core line of processors. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include /* for curthread */ #include #include #include #include #include struct coretemp_softc { device_t sc_dev; int sc_tjmax; struct sysctl_oid *sc_oid; }; /* * 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 int coretemp_get_temp_sysctl(SYSCTL_HANDLER_ARGS); 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), {0, 0} }; 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; int cpu_mask; sc->sc_dev = dev; pdev = device_get_parent(dev); cpu_model = (cpu_id >> 4) & 15; /* extended model */ cpu_model += ((cpu_id >> 16) & 0xf) << 4; cpu_mask = cpu_id & 15; /* * 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_mask < 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 /* * 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. */ sc->sc_tjmax = 100; if ((cpu_model == 0xf && cpu_mask >= 2) || cpu_model == 0xe) { msr = rdmsr(MSR_IA32_EXT_CONFIG); if (msr & (1 << 30)) sc->sc_tjmax = 85; } /* * Add the "temperature" MIB to dev.cpu.N. */ sc->sc_oid = SYSCTL_ADD_PROC(device_get_sysctl_ctx(pdev), SYSCTL_CHILDREN(device_get_sysctl_tree(pdev)), OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD, dev, 0, coretemp_get_temp_sysctl, "I", "Current temperature in degC"); return (0); } static int coretemp_detach(device_t dev) { struct coretemp_softc *sc = device_get_softc(dev); sysctl_remove_oid(sc->sc_oid, 1, 0); return (0); } static int coretemp_get_temp(device_t dev) { uint64_t msr; int temp; int cpu = device_get_unit(dev); struct coretemp_softc *sc = device_get_softc(dev); char stemp[16]; thread_lock(curthread); sched_bind(curthread, cpu); thread_unlock(curthread); /* * The digital temperature reading is located at bit 16 * of MSR_THERM_STATUS. * * There is a bit on that MSR that indicates whether the * temperature is valid or not. * * The temperature is computed by subtracting the temperature * reading by Tj(max). */ msr = rdmsr(MSR_THERM_STATUS); thread_lock(curthread); sched_unbind(curthread); thread_unlock(curthread); /* * 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"); snprintf(stemp, sizeof(stemp), "%d", temp); devctl_notify("coretemp", "Thermal", stemp, "notify=0xcc"); } return (temp); } static int coretemp_get_temp_sysctl(SYSCTL_HANDLER_ARGS) { device_t dev = (device_t) arg1; int temp; temp = coretemp_get_temp(dev); return (sysctl_handle_int(oidp, &temp, 0, req)); }