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path: root/drivers/hwmon/coretemp.c
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Diffstat (limited to 'drivers/hwmon/coretemp.c')
-rw-r--r--drivers/hwmon/coretemp.c141
1 files changed, 64 insertions, 77 deletions
diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 78be6617684..d76f0b70c6e 100644
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -36,6 +36,7 @@
#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>
@@ -52,7 +53,7 @@ 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 32 /* Number of Real cores per cpu */
-#define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
+#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)
@@ -93,6 +94,8 @@ struct temp_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;
};
@@ -113,12 +116,6 @@ struct pdev_entry {
static LIST_HEAD(pdev_list);
static DEFINE_MUTEX(pdev_list_mutex);
-static ssize_t show_name(struct device *dev,
- struct device_attribute *devattr, char *buf)
-{
- return sprintf(buf, "%s\n", DRVNAME);
-}
-
static ssize_t show_label(struct device *dev,
struct device_attribute *devattr, char *buf)
{
@@ -176,20 +173,33 @@ static ssize_t show_temp(struct device *dev,
/* 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);
- tdata->valid = 0;
- /* Check whether the data is valid */
- if (eax & 0x80000000) {
- tdata->temp = tdata->tjmax -
- ((eax >> 16) & 0x7f) * 1000;
- tdata->valid = 1;
- }
+ /*
+ * 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 tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN;
+ 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;
@@ -198,9 +208,6 @@ struct tjmax {
static const struct tjmax tjmax_table[] = {
{ "CPU 230", 100000 }, /* Model 0x1c, stepping 2 */
{ "CPU 330", 125000 }, /* Model 0x1c, stepping 2 */
- { "CPU CE4110", 110000 }, /* Model 0x1c, stepping 10 Sodaville */
- { "CPU CE4150", 110000 }, /* Model 0x1c, stepping 10 */
- { "CPU CE4170", 110000 }, /* Model 0x1c, stepping 10 */
};
struct tjmax_model {
@@ -222,8 +229,11 @@ static const struct tjmax_model tjmax_model_table[] = {
* is undetectable by software
*/
{ 0x27, ANY, 90000 }, /* Atom Medfield (Z2460) */
- { 0x35, ANY, 90000 }, /* Atom Clover Trail/Cloverview (Z2760) */
- { 0x36, ANY, 100000 }, /* Atom Cedar Trail/Cedarview (N2xxx, D2xxx) */
+ { 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)
@@ -236,8 +246,20 @@ static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
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;
+ }
+ }
- /* explicit tjmax table entries override heuristics */
for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) {
if (strstr(c->x86_model_id, tjmax_table[i].id))
return tjmax_table[i].tjmax;
@@ -367,20 +389,10 @@ static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
return adjust_tjmax(c, id, dev);
}
-static int create_name_attr(struct platform_data *pdata,
- struct device *dev)
-{
- sysfs_attr_init(&pdata->name_attr.attr);
- pdata->name_attr.attr.name = "name";
- pdata->name_attr.attr.mode = S_IRUGO;
- pdata->name_attr.show = show_name;
- return device_create_file(dev, &pdata->name_attr);
-}
-
static int create_core_attrs(struct temp_data *tdata, struct device *dev,
int attr_no)
{
- int err, i;
+ 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,
@@ -398,16 +410,10 @@ static int create_core_attrs(struct temp_data *tdata, struct device *dev,
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;
- err = device_create_file(dev, &tdata->sd_attrs[i].dev_attr);
- if (err)
- goto exit_free;
+ tdata->attrs[i] = &tdata->sd_attrs[i].dev_attr.attr;
}
- return 0;
-
-exit_free:
- while (--i >= 0)
- device_remove_file(dev, &tdata->sd_attrs[i].dev_attr);
- return err;
+ tdata->attr_group.attrs = tdata->attrs;
+ return sysfs_create_group(&dev->kobj, &tdata->attr_group);
}
@@ -522,7 +528,7 @@ static int create_core_data(struct platform_device *pdev, unsigned int cpu,
pdata->core_data[attr_no] = tdata;
/* Create sysfs interfaces */
- err = create_core_attrs(tdata, &pdev->dev, attr_no);
+ err = create_core_attrs(tdata, pdata->hwmon_dev, attr_no);
if (err)
goto exit_free;
@@ -547,14 +553,12 @@ static void coretemp_add_core(unsigned int cpu, int pkg_flag)
}
static void coretemp_remove_core(struct platform_data *pdata,
- struct device *dev, int indx)
+ int indx)
{
- int i;
struct temp_data *tdata = pdata->core_data[indx];
/* Remove the sysfs attributes */
- for (i = 0; i < tdata->attr_size; i++)
- device_remove_file(dev, &tdata->sd_attrs[i].dev_attr);
+ sysfs_remove_group(&pdata->hwmon_dev->kobj, &tdata->attr_group);
kfree(pdata->core_data[indx]);
pdata->core_data[indx] = NULL;
@@ -562,34 +566,20 @@ static void coretemp_remove_core(struct platform_data *pdata,
static int coretemp_probe(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
struct platform_data *pdata;
- int err;
/* Initialize the per-package data structures */
- pdata = kzalloc(sizeof(struct platform_data), GFP_KERNEL);
+ pdata = devm_kzalloc(dev, sizeof(struct platform_data), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
- err = create_name_attr(pdata, &pdev->dev);
- if (err)
- goto exit_free;
-
pdata->phys_proc_id = pdev->id;
platform_set_drvdata(pdev, pdata);
- pdata->hwmon_dev = hwmon_device_register(&pdev->dev);
- if (IS_ERR(pdata->hwmon_dev)) {
- err = PTR_ERR(pdata->hwmon_dev);
- dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
- goto exit_name;
- }
- return 0;
-
-exit_name:
- device_remove_file(&pdev->dev, &pdata->name_attr);
-exit_free:
- kfree(pdata);
- return err;
+ 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)
@@ -599,11 +589,8 @@ static int coretemp_remove(struct platform_device *pdev)
for (i = MAX_CORE_DATA - 1; i >= 0; --i)
if (pdata->core_data[i])
- coretemp_remove_core(pdata, &pdev->dev, i);
+ coretemp_remove_core(pdata, i);
- device_remove_file(&pdev->dev, &pdata->name_attr);
- hwmon_device_unregister(pdata->hwmon_dev);
- kfree(pdata);
return 0;
}
@@ -751,7 +738,7 @@ static void put_core_offline(unsigned int cpu)
return;
if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
- coretemp_remove_core(pdata, &pdev->dev, indx);
+ coretemp_remove_core(pdata, indx);
/*
* If a HT sibling of a core is taken offline, but another HT sibling
@@ -823,20 +810,20 @@ static int __init coretemp_init(void)
if (err)
goto exit;
- get_online_cpus();
+ cpu_notifier_register_begin();
for_each_online_cpu(i)
get_core_online(i);
#ifndef CONFIG_HOTPLUG_CPU
if (list_empty(&pdev_list)) {
- put_online_cpus();
+ cpu_notifier_register_done();
err = -ENODEV;
goto exit_driver_unreg;
}
#endif
- register_hotcpu_notifier(&coretemp_cpu_notifier);
- put_online_cpus();
+ __register_hotcpu_notifier(&coretemp_cpu_notifier);
+ cpu_notifier_register_done();
return 0;
#ifndef CONFIG_HOTPLUG_CPU
@@ -851,8 +838,8 @@ static void __exit coretemp_exit(void)
{
struct pdev_entry *p, *n;
- get_online_cpus();
- unregister_hotcpu_notifier(&coretemp_cpu_notifier);
+ 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);
@@ -860,7 +847,7 @@ static void __exit coretemp_exit(void)
kfree(p);
}
mutex_unlock(&pdev_list_mutex);
- put_online_cpus();
+ cpu_notifier_register_done();
platform_driver_unregister(&coretemp_driver);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-04 01:21:09 +0000