cregit-Linux how code gets into the kernel

Release 4.11 drivers/hwmon/coretemp.c

Directory: drivers/hwmon
/*
 * 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);
}


Contributors
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Durgadoss R4755.95%133.33%


Rudolf Marek3541.67%133.33%


Thomas Gleixner22.38%133.33%


Total84100.00%3100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Durgadoss R4642.59%133.33%


Rudolf Marek4642.59%133.33%


Thomas Gleixner1614.81%133.33%


Total108100.00%3100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Durgadoss R4983.05%133.33%


Rudolf Marek1016.95%266.67%


Total59100.00%3100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Durgadoss R3457.63%240.00%


Guenter Roeck2135.59%120.00%


Rudolf Marek46.78%240.00%


Total59100.00%5100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Rudolf Marek8654.43%250.00%


Durgadoss R7144.94%125.00%


Guenter Roeck10.63%125.00%


Total158100.00%4100.00%




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;
	struct pci_dev *host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));

	/*
         * 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_mask == tm->mask))
			return tm->tjmax;
	}

	/* Early chips have no MSR for TjMax */

	if (c->x86_model == 0xf && c->x86_mask < 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rudolf Marek22954.39%325.00%


Guenter Roeck18343.47%650.00%


Jean Delvare61.43%18.33%


Yong Wang20.48%18.33%


Dean Nelson10.24%18.33%


Total421100.00%12100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Guenter Roeck43100.00%1100.00%


Total43100.00%1100.00%






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);
}


Contributors
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Carsten Emde9873.68%114.29%


Jean Delvare2921.80%228.57%


Guenter Roeck64.51%457.14%


Total133100.00%7100.00%






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);
}



Contributors
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Durgadoss R16669.17%233.33%


Jan Beulich2510.42%116.67%


Guenter Roeck239.58%116.67%


Sergey Senozhatsky156.25%116.67%


Rasmus Villemoes114.58%116.67%


Total240100.00%6100.00%






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_mask < 0xc && c->microcode < 0x39) {
		pr_err("Errata AE18 not fixed, update BIOS or microcode of the CPU!\n");
		return -ENODEV;
	}
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Durgadoss R4478.57%116.67%


Jean Delvare58.93%116.67%


Andi Kleen47.14%116.67%


Rudolf Marek11.79%116.67%


Guenter Roeck11.79%116.67%


Jan Beulich11.79%116.67%


Total56100.00%6100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Durgadoss R2564.10%150.00%


Thomas Gleixner1435.90%150.00%


Total39100.00%2100.00%






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;
}


Contributors
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Durgadoss R89100.00%2100.00%


Total89100.00%2100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Durgadoss R18171.26%218.18%


Guenter Roeck3614.17%327.27%


Jan Beulich239.06%218.18%


Rudolf Marek83.15%218.18%


Jean Delvare51.97%19.09%


Thomas Gleixner10.39%19.09%


Total254100.00%11100.00%





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);
}


Contributors
PersonTokensPropCommitsCommitProp
Durgadoss R2458.54%133.33%


Rudolf Marek1229.27%133.33%


Thomas Gleixner512.20%133.33%


Total41100.00%3100.00%






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;
}


Contributors
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Durgadoss R4268.85%116.67%


Rudolf Marek1118.03%350.00%


Guenter Roeck813.11%233.33%


Total61100.00%6100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Durgadoss R4348.31%114.29%


Rudolf Marek2426.97%228.57%


Guenter Roeck2022.47%228.57%


Tony Jones11.12%114.29%


Thomas Gleixner11.12%114.29%


Total89100.00%7100.00%






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;
}


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Durgadoss R3255.17%150.00%


Rudolf Marek2644.83%150.00%


Total58100.00%2100.00%




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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rudolf Marek5355.79%120.00%


Thomas Gleixner3738.95%120.00%


Durgadoss R33.16%120.00%


Jan Beulich22.11%240.00%


Total95100.00%5100.00%






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;

	/*
         * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Thomas Gleixner7447.44%555.56%


Durgadoss R7246.15%111.11%


Jean Delvare85.13%111.11%


H. Peter Anvin10.64%111.11%


Rudolf Marek10.64%111.11%


Total156100.00%9100.00%






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;

	/* 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;
}

Contributors
PersonTokensPropCommitsCommitProp
Thomas Gleixner17270.78%450.00%


Durgadoss R5020.58%112.50%


Rudolf Marek83.29%112.50%


Kirill A. Shutemov83.29%112.50%


Jan Beulich52.06%112.50%


Total243100.00%8100.00%




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 = kzalloc(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;
}

Contributors
PersonTokensPropCommitsCommitProp
Thomas Gleixner6253.91%342.86%


Rudolf Marek4236.52%114.29%


Andi Kleen86.96%114.29%


Mike Travis21.74%114.29%


Jan Beulich10.87%114.29%


Total115100.00%7100.00%



module_init(coretemp_init)




static void __exit coretemp_exit(void)
{
	cpuhp_remove_state(coretemp_hp_online);
	platform_driver_unregister(&coretemp_driver);
	kfree(pkg_devices);
}

Contributors
PersonTokensPropCommitsCommitProp
Rudolf Marek1872.00%133.33%


Thomas Gleixner728.00%266.67%


Total25100.00%3100.00%



module_exit(coretemp_exit)

MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
MODULE_DESCRIPTION("Intel Core temperature monitor");
MODULE_LICENSE("GPL");

Overall Contributors
PersonTokensPropCommitsCommitProp
Durgadoss R112535.64%23.03%


Rudolf Marek71422.62%69.09%


Guenter Roeck55217.48%2233.33%


Thomas Gleixner42313.40%69.09%


Carsten Emde983.10%11.52%


Jean Delvare822.60%710.61%


Jan Beulich581.84%710.61%


Andi Kleen431.36%34.55%


Sergey Senozhatsky150.48%11.52%


Rasmus Villemoes110.35%11.52%


Kevin Winchester100.32%11.52%


Kirill A. Shutemov80.25%11.52%


Joe Perches70.22%11.52%


Bartosz Golaszewski20.06%11.52%


Mike Travis20.06%11.52%


Yong Wang20.06%11.52%


H. Peter Anvin20.06%11.52%


Tony Jones10.03%11.52%


Lukasz Odzioba10.03%11.52%


Dean Nelson10.03%11.52%


Total3157100.00%66100.00%


Directory: drivers/hwmon



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