Release 4.7 drivers/hwmon/coretemp.c

/*
 * 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 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_PHYS_ID(cpu)		(cpu_data(cpu).phys_proc_id)

#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 phys_proc_id;
	
struct temp_data *core_data[MAX_CORE_DATA];
	
struct device_attribute name_attr;
};


struct pdev_entry {
	
struct list_head list;
	
struct platform_device *pdev;
	
u16 phys_proc_id;
};

static LIST_HEAD(pdev_list);
static DEFINE_MUTEX(pdev_list_mutex);



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, "Physical id %u\n", pdata->phys_proc_id);

	return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
}

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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];

	rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);

	return sprintf(buf, "%d\n", (eax >> 5) & 1);
}

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rudolf marek
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1
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92
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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);
}

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rudolf marek
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2
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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);
}

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durgadoss r
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guenter roeck
guenter roeck
21
35.59%
1
20.00%
rudolf marek
rudolf marek
4
6.78%
2
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59
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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);
}

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71
44.94%
1
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guenter roeck
guenter roeck
1
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158
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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;
}

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guenter roeck
183
43.47%
6
50.00%
jean delvare
jean delvare
6
1.43%
1
8.33%
yong wang
yong wang
2
0.48%
1
8.33%
dean nelson
dean nelson
1
0.24%
1
8.33%
Total
421
100.00%
12
100.00%



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;
}

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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);
}

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carsten emde
carsten emde
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73.68%
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14.29%
jean delvare
jean delvare
29
21.80%
2
28.57%
guenter roeck
guenter roeck
6
4.51%
4
57.14%
Total
133
100.00%
7
100.00%



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);
}


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durgadoss r
durgadoss r
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jan beulich
jan beulich
25
10.42%
1
16.67%
guenter roeck
guenter roeck
23
9.58%
1
16.67%
sergey senozhatsky
sergey senozhatsky
15
6.25%
1
16.67%
rasmus villemoes
rasmus villemoes
11
4.58%
1
16.67%
Total
240
100.00%
6
100.00%



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;
}

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durgadoss r
durgadoss r
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16.67%
jean delvare
jean delvare
5
8.93%
1
16.67%
andi kleen
andi kleen
4
7.14%
1
16.67%
rudolf marek
rudolf marek
1
1.79%
1
16.67%
jan beulich
jan beulich
1
1.79%
1
16.67%
guenter roeck
guenter roeck
1
1.79%
1
16.67%
Total
56
100.00%
6
100.00%



static struct platform_device *coretemp_get_pdev(unsigned int cpu)
{
	u16 phys_proc_id = TO_PHYS_ID(cpu);
	struct pdev_entry *p;

	mutex_lock(&pdev_list_mutex);

	list_for_each_entry(p, &pdev_list, list)
		if (p->phys_proc_id == phys_proc_id) {
			mutex_unlock(&pdev_list_mutex);
			return p->pdev;
		}

	mutex_unlock(&pdev_list_mutex);
	return NULL;
}

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durgadoss r
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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;
}

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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 ? 1 : TO_ATTR_NO(cpu);

	if (attr_no > MAX_CORE_DATA - 1)
		return -ERANGE;

	/*
         * Provide a single set of attributes for all HT siblings of a core
         * to avoid duplicate sensors (the processor ID and core ID of all
         * HT siblings of a core are the same).
         * Skip if a HT sibling of this core is already registered.
         * This is not an error.
         */
	if (pdata->core_data[attr_no] != NULL)
		return 0;

	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;
}

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durgadoss r
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guenter roeck
37
13.75%
4
36.36%
jan beulich
jan beulich
23
8.55%
2
18.18%
rudolf marek
rudolf marek
8
2.97%
2
18.18%
jean delvare
jean delvare
5
1.86%
1
9.09%
Total
269
100.00%
11
100.00%



static void coretemp_add_core(unsigned int cpu, int pkg_flag)
{
	struct platform_device *pdev = coretemp_get_pdev(cpu);
	int err;

	if (!pdev)
		return;

	err = create_core_data(pdev, cpu, pkg_flag);
	if (err)
		dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
durgadoss r
durgadoss r
43
72.88%
1
33.33%
rudolf marek
rudolf marek
13
22.03%
1
33.33%
jean delvare
jean delvare
3
5.08%
1
33.33%
Total
59
100.00%
3
100.00%



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
Person
Tokens
Prop
Commits
CommitProp
durgadoss r
durgadoss r
42
68.85%
1
16.67%
rudolf marek
rudolf marek
11
18.03%
3
50.00%
guenter roeck
guenter roeck
8
13.11%
2
33.33%
Total
61
100.00%
6
100.00%



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->phys_proc_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
Person
Tokens
Prop
Commits
CommitProp
durgadoss r
durgadoss r
44
49.44%
1
16.67%
rudolf marek
rudolf marek
24
26.97%
2
33.33%
guenter roeck
guenter roeck
20
22.47%
2
33.33%
tony jones
tony jones
1
1.12%
1
16.67%
Total
89
100.00%
6
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
durgadoss r
durgadoss r
32
55.17%
1
50.00%
rudolf marek
rudolf marek
26
44.83%
1
50.00%
Total
58
100.00%
2
100.00%


static struct platform_driver coretemp_driver = {
	.driver = {
		.name = DRVNAME,
        },
	.probe = coretemp_probe,
	.remove = coretemp_remove,
};



static int coretemp_device_add(unsigned int cpu)
{
	int err;
	struct platform_device *pdev;
	struct pdev_entry *pdev_entry;

	mutex_lock(&pdev_list_mutex);

	pdev = platform_device_alloc(DRVNAME, TO_PHYS_ID(cpu));
	if (!pdev) {
		err = -ENOMEM;
		pr_err("Device allocation failed\n");
		goto exit;
	}

	pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
	if (!pdev_entry) {
		err = -ENOMEM;
		goto exit_device_put;
	}

	err = platform_device_add(pdev);
	if (err) {
		pr_err("Device addition failed (%d)\n", err);
		goto exit_device_free;
	}

	pdev_entry->pdev = pdev;
	pdev_entry->phys_proc_id = pdev->id;

	list_add_tail(&pdev_entry->list, &pdev_list);
	mutex_unlock(&pdev_list_mutex);

	return 0;

exit_device_free:
	kfree(pdev_entry);
exit_device_put:
	platform_device_put(pdev);
exit:
	mutex_unlock(&pdev_list_mutex);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rudolf marek
rudolf marek
143
83.63%
1
16.67%
jean delvare
jean delvare
13
7.60%
2
33.33%
joe perches
joe perches
7
4.09%
1
16.67%
durgadoss r
durgadoss r
5
2.92%
1
16.67%
jan beulich
jan beulich
3
1.75%
1
16.67%
Total
171
100.00%
6
100.00%



static void coretemp_device_remove(unsigned int cpu)
{
	struct pdev_entry *p, *n;
	u16 phys_proc_id = TO_PHYS_ID(cpu);

	mutex_lock(&pdev_list_mutex);
	list_for_each_entry_safe(p, n, &pdev_list, list) {
		if (p->phys_proc_id != phys_proc_id)
			continue;
		platform_device_unregister(p->pdev);
		list_del(&p->list);
		kfree(p);
	}
	mutex_unlock(&pdev_list_mutex);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rudolf marek
rudolf marek
47
59.49%
1
25.00%
durgadoss r
durgadoss r
22
27.85%
1
25.00%
jan beulich
jan beulich
9
11.39%
1
25.00%
adrian bunk
adrian bunk
1
1.27%
1
25.00%
Total
79
100.00%
4
100.00%



static bool is_any_core_online(struct platform_data *pdata)
{
	int i;

	/* Find online cores, except pkgtemp data */
	for (i = MAX_CORE_DATA - 1; i >= 0; --i) {
		if (pdata->core_data[i] &&
			!pdata->core_data[i]->is_pkg_data) {
			return true;
		}
	}
	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
durgadoss r
durgadoss r
59
100.00%
1
100.00%
Total
59
100.00%
1
100.00%



static void get_core_online(unsigned int cpu)
{
	struct cpuinfo_x86 *c = &cpu_data(cpu);
	struct platform_device *pdev = coretemp_get_pdev(cpu);
	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 (!cpu_has(c, X86_FEATURE_DTHERM))
		return;

	if (!pdev) {
		/* Check the microcode version of the CPU */
		if (chk_ucode_version(cpu))
			return;

		/*
                 * 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.
                 */
		err = coretemp_device_add(cpu);
		if (err)
			return;
		/*
                 * Check whether pkgtemp support is available.
                 * If so, add interfaces for pkgtemp.
                 */
		if (cpu_has(c, X86_FEATURE_PTS))
			coretemp_add_core(cpu, 1);
	}
	/*
         * Physical CPU device already exists.
         * So, just add interfaces for this core.
         */
	coretemp_add_core(cpu, 0);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
durgadoss r
durgadoss r
89
89.00%
1
25.00%
jean delvare
jean delvare
9
9.00%
1
25.00%
rudolf marek
rudolf marek
1
1.00%
1
25.00%
h. peter anvin
h. peter anvin
1
1.00%
1
25.00%
Total
100
100.00%
4
100.00%



static void put_core_offline(unsigned int cpu)
{
	int i, indx;
	struct platform_data *pdata;
	struct platform_device *pdev = coretemp_get_pdev(cpu);

	/* If the physical CPU device does not exist, just return */
	if (!pdev)
		return;

	pdata = platform_get_drvdata(pdev);

	indx = TO_ATTR_NO(cpu);

	/* The core id is too big, just return */
	if (indx > MAX_CORE_DATA - 1)
		return;

	if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
		coretemp_remove_core(pdata, indx);

	/*
         * If a HT sibling of a core is taken offline, but another HT sibling
         * of the same core is still online, register the alternate sibling.
         * This ensures that exactly one set of attributes is provided as long
         * as at least one HT sibling of a core is online.
         */
	for_each_sibling(i, cpu) {
		if (i != cpu) {
			get_core_online(i);
			/*
                         * Display temperature sensor data for one HT sibling
                         * per core only, so abort the loop after one such
                         * sibling has been found.
                         */
			break;
		}
	}
	/*
         * If all cores in this pkg are offline, remove the device.
         * coretemp_device_remove calls unregister_platform_device,
         * which in turn calls coretemp_remove. This removes the
         * pkgtemp entry and does other clean ups.
         */
	if (!is_any_core_online(pdata))
		coretemp_device_remove(cpu);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
durgadoss r
durgadoss r
92
73.02%
1
14.29%
jan beulich
jan beulich
13
10.32%
1
14.29%
kirill a. shutemov
kirill a. shutemov
10
7.94%
1
14.29%
rudolf marek
rudolf marek
7
5.56%
1
14.29%
guenter roeck
guenter roeck
4
3.17%
3
42.86%
Total
126
100.00%
7
100.00%



static int coretemp_cpu_callback(struct notifier_block *nfb,
				 unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long) hcpu;

	switch (action) {
	case CPU_ONLINE:
	case CPU_DOWN_FAILED:
		get_core_online(cpu);
		break;
	case CPU_DOWN_PREPARE:
		put_core_offline(cpu);
		break;
	}
	return NOTIFY_OK;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rudolf marek
rudolf marek
52
88.14%
1
25.00%
rafael j. wysocki
rafael j. wysocki
5
8.47%
2
50.00%
durgadoss r
durgadoss r
2
3.39%
1
25.00%
Total
59
100.00%
4
100.00%


static struct notifier_block coretemp_cpu_notifier __refdata = {
	.notifier_call = coretemp_cpu_callback,
};


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 int __init coretemp_init(void)
{
	int i, 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;

	err = platform_driver_register(&coretemp_driver);
	if (err)
		goto exit;

	cpu_notifier_register_begin();
	for_each_online_cpu(i)
		get_core_online(i);

#ifndef CONFIG_HOTPLUG_CPU
	if (list_empty(&pdev_list)) {
		cpu_notifier_register_done();
		err = -ENODEV;
		goto exit_driver_unreg;
	}
#endif

	__register_hotcpu_notifier(&coretemp_cpu_notifier);
	cpu_notifier_register_done();
	return 0;

#ifndef CONFIG_HOTPLUG_CPU
exit_driver_unreg:
	platform_driver_unregister(&coretemp_driver);
#endif
exit:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rudolf marek
rudolf marek
77
70.00%
1
12.50%
andi kleen
andi kleen
8
7.27%
1
12.50%
jan beulich
jan beulich
7
6.36%
1
12.50%
silas boyd-wickizer
silas boyd-wickizer
6
5.45%
1
12.50%
gong chen
gong chen
5
4.55%
1
12.50%
srivatsa s. bhat
srivatsa s. bhat
4
3.64%
1
12.50%
mike travis
mike travis
2
1.82%
1
12.50%
durgadoss r
durgadoss r
1
0.91%
1
12.50%
Total
110
100.00%
8
100.00%



static void __exit coretemp_exit(void)
{
	struct pdev_entry *p, *n;

	cpu_notifier_register_begin();
	__unregister_hotcpu_notifier(&coretemp_cpu_notifier);
	mutex_lock(&pdev_list_mutex);
	list_for_each_entry_safe(p, n, &pdev_list, list) {
		platform_device_unregister(p->pdev);
		list_del(&p->list);
		kfree(p);
	}
	mutex_unlock(&pdev_list_mutex);
	cpu_notifier_register_done();
	platform_driver_unregister(&coretemp_driver);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
rudolf marek
rudolf marek
72
91.14%
1
33.33%
silas boyd-wickizer
silas boyd-wickizer
4
5.06%
1
33.33%
srivatsa s. bhat
srivatsa s. bhat
3
3.80%
1
33.33%
Total
79
100.00%
3
100.00%

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

module_init(coretemp_init)
module_exit(coretemp_exit)
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
durgadoss r
durgadoss r
1378
40.84%
2
2.82%
rudolf marek
rudolf marek
1016
30.11%
6
8.45%
guenter roeck
guenter roeck
558
16.54%
24
33.80%
jean delvare
jean delvare
99
2.93%
9
12.68%
carsten emde
carsten emde
98
2.90%
1
1.41%
jan beulich
jan beulich
82
2.43%
7
9.86%
andi kleen
andi kleen
43
1.27%
3
4.23%
sergey senozhatsky
sergey senozhatsky
15
0.44%
1
1.41%
joe perches
joe perches
14
0.41%
1
1.41%
rasmus villemoes
rasmus villemoes
11
0.33%
1
1.41%
kevin winchester
kevin winchester
10
0.30%
1
1.41%
kirill a. shutemov
kirill a. shutemov
10
0.30%
1
1.41%
silas boyd-wickizer
silas boyd-wickizer
10
0.30%
1
1.41%
srivatsa s. bhat
srivatsa s. bhat
7
0.21%
1
1.41%
gong chen
gong chen
5
0.15%
1
1.41%
rafael j. wysocki
rafael j. wysocki
5
0.15%
2
2.82%
yong wang
yong wang
2
0.06%
1
1.41%
mike travis
mike travis
2
0.06%
1
1.41%
bartosz golaszewski
bartosz golaszewski
2
0.06%
1
1.41%
h. peter anvin
h. peter anvin
2
0.06%
1
1.41%
dean nelson
dean nelson
1
0.03%
1
1.41%
sam ravnborg
sam ravnborg
1
0.03%
1
1.41%
tony jones
tony jones
1
0.03%
1
1.41%
adrian bunk
adrian bunk
1
0.03%
1
1.41%
lukasz odzioba
lukasz odzioba
1
0.03%
1
1.41%
Total
3374
100.00%
71
100.00%
  
Directory: drivers/hwmon

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