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-rw-r--r--drivers/hwmon/coretemp.c778
1 files changed, 778 insertions, 0 deletions
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
new file mode 100644
index 000000000..10645c9bb
--- /dev/null
+++ b/drivers/hwmon/coretemp.c
@@ -0,0 +1,778 @@
+/*
+ * coretemp.c - Linux kernel module for hardware monitoring
+ *
+ * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
+ *
+ * Inspired from many hwmon drivers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/hwmon.h>
+#include <linux/sysfs.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/cpu.h>
+#include <linux/smp.h>
+#include <linux/moduleparam.h>
+#include <linux/pci.h>
+#include <asm/msr.h>
+#include <asm/processor.h>
+#include <asm/cpu_device_id.h>
+
+#define DRVNAME "coretemp"
+
+/*
+ * force_tjmax only matters when TjMax can't be read from the CPU itself.
+ * When set, it replaces the driver's suboptimal heuristic.
+ */
+static int force_tjmax;
+module_param_named(tjmax, force_tjmax, int, 0444);
+MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
+
+#define PKG_SYSFS_ATTR_NO 1 /* Sysfs attribute for package temp */
+#define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
+#define NUM_REAL_CORES 128 /* Number of Real cores per cpu */
+#define CORETEMP_NAME_LENGTH 19 /* String Length of attrs */
+#define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
+#define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
+#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
+
+#define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
+#define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO)
+
+#ifdef CONFIG_SMP
+#define for_each_sibling(i, cpu) \
+ for_each_cpu(i, topology_sibling_cpumask(cpu))
+#else
+#define for_each_sibling(i, cpu) for (i = 0; false; )
+#endif
+
+/*
+ * Per-Core Temperature Data
+ * @last_updated: The time when the current temperature value was updated
+ * earlier (in jiffies).
+ * @cpu_core_id: The CPU Core from which temperature values should be read
+ * This value is passed as "id" field to rdmsr/wrmsr functions.
+ * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
+ * from where the temperature values should be read.
+ * @attr_size: Total number of pre-core attrs displayed in the sysfs.
+ * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
+ * Otherwise, temp_data holds coretemp data.
+ * @valid: If this is 1, the current temperature is valid.
+ */
+struct temp_data {
+ int temp;
+ int ttarget;
+ int tjmax;
+ unsigned long last_updated;
+ unsigned int cpu;
+ u32 cpu_core_id;
+ u32 status_reg;
+ int attr_size;
+ bool is_pkg_data;
+ bool valid;
+ struct sensor_device_attribute sd_attrs[TOTAL_ATTRS];
+ char attr_name[TOTAL_ATTRS][CORETEMP_NAME_LENGTH];
+ struct attribute *attrs[TOTAL_ATTRS + 1];
+ struct attribute_group attr_group;
+ struct mutex update_lock;
+};
+
+/* Platform Data per Physical CPU */
+struct platform_data {
+ struct device *hwmon_dev;
+ u16 pkg_id;
+ struct cpumask cpumask;
+ struct temp_data *core_data[MAX_CORE_DATA];
+ struct device_attribute name_attr;
+};
+
+/* Keep track of how many package pointers we allocated in init() */
+static int max_packages __read_mostly;
+/* Array of package pointers. Serialized by cpu hotplug lock */
+static struct platform_device **pkg_devices;
+
+static ssize_t show_label(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct platform_data *pdata = dev_get_drvdata(dev);
+ struct temp_data *tdata = pdata->core_data[attr->index];
+
+ if (tdata->is_pkg_data)
+ return sprintf(buf, "Package id %u\n", pdata->pkg_id);
+
+ return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
+}
+
+static ssize_t show_crit_alarm(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ u32 eax, edx;
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct platform_data *pdata = dev_get_drvdata(dev);
+ struct temp_data *tdata = pdata->core_data[attr->index];
+
+ mutex_lock(&tdata->update_lock);
+ rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
+ mutex_unlock(&tdata->update_lock);
+
+ return sprintf(buf, "%d\n", (eax >> 5) & 1);
+}
+
+static ssize_t show_tjmax(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct platform_data *pdata = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax);
+}
+
+static ssize_t show_ttarget(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct platform_data *pdata = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
+}
+
+static ssize_t show_temp(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ u32 eax, edx;
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct platform_data *pdata = dev_get_drvdata(dev);
+ struct temp_data *tdata = pdata->core_data[attr->index];
+
+ mutex_lock(&tdata->update_lock);
+
+ /* Check whether the time interval has elapsed */
+ if (!tdata->valid || time_after(jiffies, tdata->last_updated + HZ)) {
+ rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
+ /*
+ * Ignore the valid bit. In all observed cases the register
+ * value is either low or zero if the valid bit is 0.
+ * Return it instead of reporting an error which doesn't
+ * really help at all.
+ */
+ tdata->temp = tdata->tjmax - ((eax >> 16) & 0x7f) * 1000;
+ tdata->valid = 1;
+ tdata->last_updated = jiffies;
+ }
+
+ mutex_unlock(&tdata->update_lock);
+ return sprintf(buf, "%d\n", tdata->temp);
+}
+
+struct tjmax_pci {
+ unsigned int device;
+ int tjmax;
+};
+
+static const struct tjmax_pci tjmax_pci_table[] = {
+ { 0x0708, 110000 }, /* CE41x0 (Sodaville ) */
+ { 0x0c72, 102000 }, /* Atom S1240 (Centerton) */
+ { 0x0c73, 95000 }, /* Atom S1220 (Centerton) */
+ { 0x0c75, 95000 }, /* Atom S1260 (Centerton) */
+};
+
+struct tjmax {
+ char const *id;
+ int tjmax;
+};
+
+static const struct tjmax tjmax_table[] = {
+ { "CPU 230", 100000 }, /* Model 0x1c, stepping 2 */
+ { "CPU 330", 125000 }, /* Model 0x1c, stepping 2 */
+};
+
+struct tjmax_model {
+ u8 model;
+ u8 mask;
+ int tjmax;
+};
+
+#define ANY 0xff
+
+static const struct tjmax_model tjmax_model_table[] = {
+ { 0x1c, 10, 100000 }, /* D4xx, K4xx, N4xx, D5xx, K5xx, N5xx */
+ { 0x1c, ANY, 90000 }, /* Z5xx, N2xx, possibly others
+ * Note: Also matches 230 and 330,
+ * which are covered by tjmax_table
+ */
+ { 0x26, ANY, 90000 }, /* Atom Tunnel Creek (Exx), Lincroft (Z6xx)
+ * Note: TjMax for E6xxT is 110C, but CPU type
+ * is undetectable by software
+ */
+ { 0x27, ANY, 90000 }, /* Atom Medfield (Z2460) */
+ { 0x35, ANY, 90000 }, /* Atom Clover Trail/Cloverview (Z27x0) */
+ { 0x36, ANY, 100000 }, /* Atom Cedar Trail/Cedarview (N2xxx, D2xxx)
+ * Also matches S12x0 (stepping 9), covered by
+ * PCI table
+ */
+};
+
+static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
+{
+ /* The 100C is default for both mobile and non mobile CPUs */
+
+ int tjmax = 100000;
+ int tjmax_ee = 85000;
+ int usemsr_ee = 1;
+ int err;
+ u32 eax, edx;
+ int i;
+ u16 devfn = PCI_DEVFN(0, 0);
+ struct pci_dev *host_bridge = pci_get_domain_bus_and_slot(0, 0, devfn);
+
+ /*
+ * Explicit tjmax table entries override heuristics.
+ * First try PCI host bridge IDs, followed by model ID strings
+ * and model/stepping information.
+ */
+ if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL) {
+ for (i = 0; i < ARRAY_SIZE(tjmax_pci_table); i++) {
+ if (host_bridge->device == tjmax_pci_table[i].device)
+ return tjmax_pci_table[i].tjmax;
+ }
+ }
+
+ for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) {
+ if (strstr(c->x86_model_id, tjmax_table[i].id))
+ return tjmax_table[i].tjmax;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(tjmax_model_table); i++) {
+ const struct tjmax_model *tm = &tjmax_model_table[i];
+ if (c->x86_model == tm->model &&
+ (tm->mask == ANY || c->x86_stepping == tm->mask))
+ return tm->tjmax;
+ }
+
+ /* Early chips have no MSR for TjMax */
+
+ if (c->x86_model == 0xf && c->x86_stepping < 4)
+ usemsr_ee = 0;
+
+ if (c->x86_model > 0xe && usemsr_ee) {
+ u8 platform_id;
+
+ /*
+ * Now we can detect the mobile CPU using Intel provided table
+ * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
+ * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
+ */
+ err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
+ if (err) {
+ dev_warn(dev,
+ "Unable to access MSR 0x17, assuming desktop"
+ " CPU\n");
+ usemsr_ee = 0;
+ } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
+ /*
+ * Trust bit 28 up to Penryn, I could not find any
+ * documentation on that; if you happen to know
+ * someone at Intel please ask
+ */
+ usemsr_ee = 0;
+ } else {
+ /* Platform ID bits 52:50 (EDX starts at bit 32) */
+ platform_id = (edx >> 18) & 0x7;
+
+ /*
+ * Mobile Penryn CPU seems to be platform ID 7 or 5
+ * (guesswork)
+ */
+ if (c->x86_model == 0x17 &&
+ (platform_id == 5 || platform_id == 7)) {
+ /*
+ * If MSR EE bit is set, set it to 90 degrees C,
+ * otherwise 105 degrees C
+ */
+ tjmax_ee = 90000;
+ tjmax = 105000;
+ }
+ }
+ }
+
+ if (usemsr_ee) {
+ err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
+ if (err) {
+ dev_warn(dev,
+ "Unable to access MSR 0xEE, for Tjmax, left"
+ " at default\n");
+ } else if (eax & 0x40000000) {
+ tjmax = tjmax_ee;
+ }
+ } else if (tjmax == 100000) {
+ /*
+ * If we don't use msr EE it means we are desktop CPU
+ * (with exeception of Atom)
+ */
+ dev_warn(dev, "Using relative temperature scale!\n");
+ }
+
+ return tjmax;
+}
+
+static bool cpu_has_tjmax(struct cpuinfo_x86 *c)
+{
+ u8 model = c->x86_model;
+
+ return model > 0xe &&
+ model != 0x1c &&
+ model != 0x26 &&
+ model != 0x27 &&
+ model != 0x35 &&
+ model != 0x36;
+}
+
+static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
+{
+ int err;
+ u32 eax, edx;
+ u32 val;
+
+ /*
+ * A new feature of current Intel(R) processors, the
+ * IA32_TEMPERATURE_TARGET contains the TjMax value
+ */
+ err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
+ if (err) {
+ if (cpu_has_tjmax(c))
+ dev_warn(dev, "Unable to read TjMax from CPU %u\n", id);
+ } else {
+ val = (eax >> 16) & 0xff;
+ /*
+ * If the TjMax is not plausible, an assumption
+ * will be used
+ */
+ if (val) {
+ dev_dbg(dev, "TjMax is %d degrees C\n", val);
+ return val * 1000;
+ }
+ }
+
+ if (force_tjmax) {
+ dev_notice(dev, "TjMax forced to %d degrees C by user\n",
+ force_tjmax);
+ return force_tjmax * 1000;
+ }
+
+ /*
+ * An assumption is made for early CPUs and unreadable MSR.
+ * NOTE: the calculated value may not be correct.
+ */
+ return adjust_tjmax(c, id, dev);
+}
+
+static int create_core_attrs(struct temp_data *tdata, struct device *dev,
+ int attr_no)
+{
+ int i;
+ static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev,
+ struct device_attribute *devattr, char *buf) = {
+ show_label, show_crit_alarm, show_temp, show_tjmax,
+ show_ttarget };
+ static const char *const suffixes[TOTAL_ATTRS] = {
+ "label", "crit_alarm", "input", "crit", "max"
+ };
+
+ for (i = 0; i < tdata->attr_size; i++) {
+ snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH,
+ "temp%d_%s", attr_no, suffixes[i]);
+ sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
+ tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
+ tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO;
+ tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
+ tdata->sd_attrs[i].index = attr_no;
+ tdata->attrs[i] = &tdata->sd_attrs[i].dev_attr.attr;
+ }
+ tdata->attr_group.attrs = tdata->attrs;
+ return sysfs_create_group(&dev->kobj, &tdata->attr_group);
+}
+
+
+static int chk_ucode_version(unsigned int cpu)
+{
+ struct cpuinfo_x86 *c = &cpu_data(cpu);
+
+ /*
+ * Check if we have problem with errata AE18 of Core processors:
+ * Readings might stop update when processor visited too deep sleep,
+ * fixed for stepping D0 (6EC).
+ */
+ if (c->x86_model == 0xe && c->x86_stepping < 0xc && c->microcode < 0x39) {
+ pr_err("Errata AE18 not fixed, update BIOS or microcode of the CPU!\n");
+ return -ENODEV;
+ }
+ return 0;
+}
+
+static struct platform_device *coretemp_get_pdev(unsigned int cpu)
+{
+ int pkgid = topology_logical_package_id(cpu);
+
+ if (pkgid >= 0 && pkgid < max_packages)
+ return pkg_devices[pkgid];
+ return NULL;
+}
+
+static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
+{
+ struct temp_data *tdata;
+
+ tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
+ if (!tdata)
+ return NULL;
+
+ tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
+ MSR_IA32_THERM_STATUS;
+ tdata->is_pkg_data = pkg_flag;
+ tdata->cpu = cpu;
+ tdata->cpu_core_id = TO_CORE_ID(cpu);
+ tdata->attr_size = MAX_CORE_ATTRS;
+ mutex_init(&tdata->update_lock);
+ return tdata;
+}
+
+static int create_core_data(struct platform_device *pdev, unsigned int cpu,
+ int pkg_flag)
+{
+ struct temp_data *tdata;
+ struct platform_data *pdata = platform_get_drvdata(pdev);
+ struct cpuinfo_x86 *c = &cpu_data(cpu);
+ u32 eax, edx;
+ int err, attr_no;
+
+ /*
+ * Find attr number for sysfs:
+ * We map the attr number to core id of the CPU
+ * The attr number is always core id + 2
+ * The Pkgtemp will always show up as temp1_*, if available
+ */
+ attr_no = pkg_flag ? PKG_SYSFS_ATTR_NO : TO_ATTR_NO(cpu);
+
+ if (attr_no > MAX_CORE_DATA - 1)
+ return -ERANGE;
+
+ tdata = init_temp_data(cpu, pkg_flag);
+ if (!tdata)
+ return -ENOMEM;
+
+ /* Test if we can access the status register */
+ err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx);
+ if (err)
+ goto exit_free;
+
+ /* We can access status register. Get Critical Temperature */
+ tdata->tjmax = get_tjmax(c, cpu, &pdev->dev);
+
+ /*
+ * Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET.
+ * The target temperature is available on older CPUs but not in this
+ * register. Atoms don't have the register at all.
+ */
+ if (c->x86_model > 0xe && c->x86_model != 0x1c) {
+ err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET,
+ &eax, &edx);
+ if (!err) {
+ tdata->ttarget
+ = tdata->tjmax - ((eax >> 8) & 0xff) * 1000;
+ tdata->attr_size++;
+ }
+ }
+
+ pdata->core_data[attr_no] = tdata;
+
+ /* Create sysfs interfaces */
+ err = create_core_attrs(tdata, pdata->hwmon_dev, attr_no);
+ if (err)
+ goto exit_free;
+
+ return 0;
+exit_free:
+ pdata->core_data[attr_no] = NULL;
+ kfree(tdata);
+ return err;
+}
+
+static void
+coretemp_add_core(struct platform_device *pdev, unsigned int cpu, int pkg_flag)
+{
+ if (create_core_data(pdev, cpu, pkg_flag))
+ dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
+}
+
+static void coretemp_remove_core(struct platform_data *pdata, int indx)
+{
+ struct temp_data *tdata = pdata->core_data[indx];
+
+ /* Remove the sysfs attributes */
+ sysfs_remove_group(&pdata->hwmon_dev->kobj, &tdata->attr_group);
+
+ kfree(pdata->core_data[indx]);
+ pdata->core_data[indx] = NULL;
+}
+
+static int coretemp_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct platform_data *pdata;
+
+ /* Initialize the per-package data structures */
+ pdata = devm_kzalloc(dev, sizeof(struct platform_data), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ pdata->pkg_id = pdev->id;
+ platform_set_drvdata(pdev, pdata);
+
+ pdata->hwmon_dev = devm_hwmon_device_register_with_groups(dev, DRVNAME,
+ pdata, NULL);
+ return PTR_ERR_OR_ZERO(pdata->hwmon_dev);
+}
+
+static int coretemp_remove(struct platform_device *pdev)
+{
+ struct platform_data *pdata = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = MAX_CORE_DATA - 1; i >= 0; --i)
+ if (pdata->core_data[i])
+ coretemp_remove_core(pdata, i);
+
+ return 0;
+}
+
+static struct platform_driver coretemp_driver = {
+ .driver = {
+ .name = DRVNAME,
+ },
+ .probe = coretemp_probe,
+ .remove = coretemp_remove,
+};
+
+static struct platform_device *coretemp_device_add(unsigned int cpu)
+{
+ int err, pkgid = topology_logical_package_id(cpu);
+ struct platform_device *pdev;
+
+ if (pkgid < 0)
+ return ERR_PTR(-ENOMEM);
+
+ pdev = platform_device_alloc(DRVNAME, pkgid);
+ if (!pdev)
+ return ERR_PTR(-ENOMEM);
+
+ err = platform_device_add(pdev);
+ if (err) {
+ platform_device_put(pdev);
+ return ERR_PTR(err);
+ }
+
+ pkg_devices[pkgid] = pdev;
+ return pdev;
+}
+
+static int coretemp_cpu_online(unsigned int cpu)
+{
+ struct platform_device *pdev = coretemp_get_pdev(cpu);
+ struct cpuinfo_x86 *c = &cpu_data(cpu);
+ struct platform_data *pdata;
+
+ /*
+ * Don't execute this on resume as the offline callback did
+ * not get executed on suspend.
+ */
+ if (cpuhp_tasks_frozen)
+ return 0;
+
+ /*
+ * CPUID.06H.EAX[0] indicates whether the CPU has thermal
+ * sensors. We check this bit only, all the early CPUs
+ * without thermal sensors will be filtered out.
+ */
+ if (!cpu_has(c, X86_FEATURE_DTHERM))
+ return -ENODEV;
+
+ if (!pdev) {
+ /* Check the microcode version of the CPU */
+ if (chk_ucode_version(cpu))
+ return -EINVAL;
+
+ /*
+ * Alright, we have DTS support.
+ * We are bringing the _first_ core in this pkg
+ * online. So, initialize per-pkg data structures and
+ * then bring this core online.
+ */
+ pdev = coretemp_device_add(cpu);
+ if (IS_ERR(pdev))
+ return PTR_ERR(pdev);
+
+ /*
+ * Check whether pkgtemp support is available.
+ * If so, add interfaces for pkgtemp.
+ */
+ if (cpu_has(c, X86_FEATURE_PTS))
+ coretemp_add_core(pdev, cpu, 1);
+ }
+
+ pdata = platform_get_drvdata(pdev);
+ /*
+ * Check whether a thread sibling is already online. If not add the
+ * interface for this CPU core.
+ */
+ if (!cpumask_intersects(&pdata->cpumask, topology_sibling_cpumask(cpu)))
+ coretemp_add_core(pdev, cpu, 0);
+
+ cpumask_set_cpu(cpu, &pdata->cpumask);
+ return 0;
+}
+
+static int coretemp_cpu_offline(unsigned int cpu)
+{
+ struct platform_device *pdev = coretemp_get_pdev(cpu);
+ struct platform_data *pd;
+ struct temp_data *tdata;
+ int indx, target;
+
+ /*
+ * Don't execute this on suspend as the device remove locks
+ * up the machine.
+ */
+ if (cpuhp_tasks_frozen)
+ return 0;
+
+ /* If the physical CPU device does not exist, just return */
+ if (!pdev)
+ return 0;
+
+ /* The core id is too big, just return */
+ indx = TO_ATTR_NO(cpu);
+ if (indx > MAX_CORE_DATA - 1)
+ return 0;
+
+ pd = platform_get_drvdata(pdev);
+ tdata = pd->core_data[indx];
+
+ cpumask_clear_cpu(cpu, &pd->cpumask);
+
+ /*
+ * If this is the last thread sibling, remove the CPU core
+ * interface, If there is still a sibling online, transfer the
+ * target cpu of that core interface to it.
+ */
+ target = cpumask_any_and(&pd->cpumask, topology_sibling_cpumask(cpu));
+ if (target >= nr_cpu_ids) {
+ coretemp_remove_core(pd, indx);
+ } else if (tdata && tdata->cpu == cpu) {
+ mutex_lock(&tdata->update_lock);
+ tdata->cpu = target;
+ mutex_unlock(&tdata->update_lock);
+ }
+
+ /*
+ * If all cores in this pkg are offline, remove the device. This
+ * will invoke the platform driver remove function, which cleans up
+ * the rest.
+ */
+ if (cpumask_empty(&pd->cpumask)) {
+ pkg_devices[topology_logical_package_id(cpu)] = NULL;
+ platform_device_unregister(pdev);
+ return 0;
+ }
+
+ /*
+ * Check whether this core is the target for the package
+ * interface. We need to assign it to some other cpu.
+ */
+ tdata = pd->core_data[PKG_SYSFS_ATTR_NO];
+ if (tdata && tdata->cpu == cpu) {
+ target = cpumask_first(&pd->cpumask);
+ mutex_lock(&tdata->update_lock);
+ tdata->cpu = target;
+ mutex_unlock(&tdata->update_lock);
+ }
+ return 0;
+}
+static const struct x86_cpu_id __initconst coretemp_ids[] = {
+ { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_DTHERM },
+ {}
+};
+MODULE_DEVICE_TABLE(x86cpu, coretemp_ids);
+
+static enum cpuhp_state coretemp_hp_online;
+
+static int __init coretemp_init(void)
+{
+ int err;
+
+ /*
+ * CPUID.06H.EAX[0] indicates whether the CPU has thermal
+ * sensors. We check this bit only, all the early CPUs
+ * without thermal sensors will be filtered out.
+ */
+ if (!x86_match_cpu(coretemp_ids))
+ return -ENODEV;
+
+ max_packages = topology_max_packages();
+ pkg_devices = kcalloc(max_packages, sizeof(struct platform_device *),
+ GFP_KERNEL);
+ if (!pkg_devices)
+ return -ENOMEM;
+
+ err = platform_driver_register(&coretemp_driver);
+ if (err)
+ return err;
+
+ err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/coretemp:online",
+ coretemp_cpu_online, coretemp_cpu_offline);
+ if (err < 0)
+ goto outdrv;
+ coretemp_hp_online = err;
+ return 0;
+
+outdrv:
+ platform_driver_unregister(&coretemp_driver);
+ kfree(pkg_devices);
+ return err;
+}
+module_init(coretemp_init)
+
+static void __exit coretemp_exit(void)
+{
+ cpuhp_remove_state(coretemp_hp_online);
+ platform_driver_unregister(&coretemp_driver);
+ kfree(pkg_devices);
+}
+module_exit(coretemp_exit)
+
+MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
+MODULE_DESCRIPTION("Intel Core temperature monitor");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 18:24:27 +0000