OpenCloudOS-Kernel/drivers/hwmon/coretemp.c

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/*
* 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);
}
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);
}
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;
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;
}
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]);
hwmon: (coretemp) Initialize sysfs attributes Initialize sysfs attrs before device_create_file() call to suppress lockdep_init_map() warning: [ 3.653628] WARNING: at kernel/lockdep.c:2885 lockdep_init_map+0xea/0x43c() [ 3.653698] Modules linked in: [ 3.654835] Pid: 1, comm: swapper Not tainted 2.6.39-dbg-git8-05624-g46187f8 #576 [ 3.656014] Call Trace: [ 3.657139] [<ffffffff8103e4b4>] warn_slowpath_common+0x7e/0x96 [ 3.658298] [<ffffffff8103e4e1>] warn_slowpath_null+0x15/0x17 [ 3.659460] [<ffffffff8106d7b9>] lockdep_init_map+0xea/0x43c [ 3.660616] [<ffffffff81163c1a>] sysfs_add_file_mode+0x5d/0xa8 [ 3.661785] [<ffffffff81163c71>] sysfs_add_file+0xc/0xe [ 3.662929] [<ffffffff81163d26>] sysfs_create_file+0x23/0x25 [ 3.664045] [<ffffffff813724d1>] device_create_file+0x14/0x16 [ 3.665172] [<ffffffff81460ed4>] coretemp_probe+0xf9/0x185 [ 3.666306] [<ffffffff8137638e>] platform_drv_probe+0x12/0x14 [ 3.667420] [<ffffffff81375321>] driver_probe_device+0xb0/0x14b [ 3.668542] [<ffffffff8137546d>] __device_attach+0x35/0x3a [ 3.669710] [<ffffffff81375438>] ? __driver_attach+0x7c/0x7c [ 3.670816] [<ffffffff8137426b>] bus_for_each_drv+0x54/0x88 [ 3.671921] [<ffffffff81375231>] device_attach+0x77/0x9b [ 3.673027] [<ffffffff81374aef>] bus_probe_device+0x22/0x39 [ 3.674137] [<ffffffff81373235>] device_add+0x3c1/0x550 [ 3.675249] [<ffffffff81371ed9>] ? dev_set_name+0x3c/0x3e [ 3.676371] [<ffffffff813769f3>] platform_device_add+0x10c/0x156 [ 3.677491] [<ffffffff8146af9c>] get_core_online+0xab/0x16e [ 3.678608] [<ffffffff81ad8070>] coretemp_init+0x4b/0x80 [ 3.679724] [<ffffffff81ad8025>] ? hwmon_init+0xee/0xee [ 3.680853] [<ffffffff8100020a>] do_one_initcall+0x7a/0x13c [ 3.681975] [<ffffffff81aaac74>] kernel_init+0xe1/0x15b [ 3.683081] [<ffffffff8147e4e4>] kernel_thread_helper+0x4/0x10 [ 3.684174] [<ffffffff8102d48c>] ? finish_task_switch+0x76/0xf0 [ 3.685266] [<ffffffff81477918>] ? retint_restore_args+0x13/0x13 [ 3.686356] [<ffffffff81aaab93>] ? start_kernel+0x3ee/0x3ee [ 3.687425] [<ffffffff8147e4e0>] ? gs_change+0x13/0x13 [ 3.688489] ---[ end trace 7392ad3e6a92ae39 ]--- Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-05-24 19:28:31 +08:00
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_mask < 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)
{
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;
}
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 ? 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;
}
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);
}
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->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);
}
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 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;
}
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);
}
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;
}
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);
}
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);
hwmon: (coretemp) fix oops on cpu unplug coretemp tries to access core_data array beyond bounds on cpu unplug if core id of the cpu if more than NUM_REAL_CORES-1. BUG: unable to handle kernel NULL pointer dereference at 000000000000013c IP: [<ffffffffa00159af>] coretemp_cpu_callback+0x93/0x1ba [coretemp] PGD 673e5a067 PUD 66e9b3067 PMD 0 Oops: 0000 [#1] SMP CPU 79 Modules linked in: sunrpc cpufreq_ondemand acpi_cpufreq freq_table mperf bnep bluetooth rfkill ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter nf_conntrack_ipv4 nf_defrag_ipv4 ip6_tables xt_state nf_conntrack coretemp crc32c_intel asix tpm_tis pcspkr usbnet iTCO_wdt i2c_i801 microcode mii joydev tpm i2c_core iTCO_vendor_support tpm_bios i7core_edac igb ioatdma edac_core dca megaraid_sas [last unloaded: oprofile] Pid: 3315, comm: set-cpus Tainted: G W 3.4.0-rc5+ #2 QCI QSSC-S4R/QSSC-S4R RIP: 0010:[<ffffffffa00159af>] [<ffffffffa00159af>] coretemp_cpu_callback+0x93/0x1ba [coretemp] RSP: 0018:ffff880472fb3d48 EFLAGS: 00010246 RAX: 0000000000000124 RBX: 0000000000000034 RCX: 00000000ffffffff RDX: 0000000000000000 RSI: 0000000000000046 RDI: 0000000000000246 RBP: ffff880472fb3d88 R08: ffff88077fcd36c0 R09: 0000000000000001 R10: ffffffff8184bc48 R11: 0000000000000000 R12: ffff880273095800 R13: 0000000000000013 R14: ffff8802730a1810 R15: 0000000000000000 FS: 00007f694a20f720(0000) GS:ffff88077fcc0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 000000000000013c CR3: 000000067209b000 CR4: 00000000000007e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process set-cpus (pid: 3315, threadinfo ffff880472fb2000, task ffff880471fa0000) Stack: ffff880277b4c308 0000000000000003 ffff880472fb3d88 0000000000000005 0000000000000034 00000000ffffffd1 ffffffff81cadc70 ffff880472fb3e14 ffff880472fb3dc8 ffffffff8161f48d ffff880471fa0000 0000000000000034 Call Trace: [<ffffffff8161f48d>] notifier_call_chain+0x4d/0x70 [<ffffffff8107f1be>] __raw_notifier_call_chain+0xe/0x10 [<ffffffff81059d30>] __cpu_notify+0x20/0x40 [<ffffffff815fa251>] _cpu_down+0x81/0x270 [<ffffffff815fa477>] cpu_down+0x37/0x50 [<ffffffff815fd6a3>] store_online+0x63/0xc0 [<ffffffff813c7078>] dev_attr_store+0x18/0x30 [<ffffffff811f02cf>] sysfs_write_file+0xef/0x170 [<ffffffff81180443>] vfs_write+0xb3/0x180 [<ffffffff8118076a>] sys_write+0x4a/0x90 [<ffffffff816236a9>] system_call_fastpath+0x16/0x1b Code: 48 c7 c7 94 60 01 a0 44 0f b7 ac 10 ac 00 00 00 31 c0 e8 41 b7 5f e1 41 83 c5 02 49 63 c5 49 8b 44 c4 10 48 85 c0 74 56 45 31 ff <39> 58 18 75 4e eb 1f 49 63 d7 4c 89 f7 48 89 45 c8 48 6b d2 28 RIP [<ffffffffa00159af>] coretemp_cpu_callback+0x93/0x1ba [coretemp] RSP <ffff880472fb3d48> CR2: 000000000000013c Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: stable@vger.kernel.org # 3.0+ Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2012-04-30 21:18:01 +08:00
/* 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);
}
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;
}
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;
}
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);
}
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)