diff options
| -rw-r--r-- | Documentation/hwmon/coretemp | 21 | ||||
| -rw-r--r-- | drivers/hwmon/coretemp.c | 665 |
2 files changed, 469 insertions, 217 deletions
diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp index 25568f844804..f85e913a3401 100644 --- a/Documentation/hwmon/coretemp +++ b/Documentation/hwmon/coretemp @@ -15,8 +15,13 @@ Author: Rudolf Marek Description ----------- +This driver permits reading the DTS (Digital Temperature Sensor) embedded +inside Intel CPUs. This driver can read both the per-core and per-package +temperature using the appropriate sensors. The per-package sensor is new; +as of now, it is present only in the SandyBridge platform. The driver will +show the temperature of all cores inside a package under a single device +directory inside hwmon. -This driver permits reading temperature sensor embedded inside Intel Core CPU. Temperature is measured in degrees Celsius and measurement resolution is 1 degree C. Valid temperatures are from 0 to TjMax degrees C, because the actual value of temperature register is in fact a delta from TjMax. @@ -27,13 +32,15 @@ mechanism will perform actions to forcibly cool down the processor. Alarm may be raised, if the temperature grows enough (more than TjMax) to trigger the Out-Of-Spec bit. Following table summarizes the exported sysfs files: -temp1_input - Core temperature (in millidegrees Celsius). -temp1_max - All cooling devices should be turned on (on Core2). -temp1_crit - Maximum junction temperature (in millidegrees Celsius). -temp1_crit_alarm - Set when Out-of-spec bit is set, never clears. +All Sysfs entries are named with their core_id (represented here by 'X'). +tempX_input - Core temperature (in millidegrees Celsius). +tempX_max - All cooling devices should be turned on (on Core2). +tempX_crit - Maximum junction temperature (in millidegrees Celsius). +tempX_crit_alarm - Set when Out-of-spec bit is set, never clears. Correct CPU operation is no longer guaranteed. -temp1_label - Contains string "Core X", where X is processor - number. +tempX_label - Contains string "Core X", where X is processor + number. For Package temp, this will be "Physical id Y", + where Y is the package number. The TjMax temperature is set to 85 degrees C if undocumented model specific register (UMSR) 0xee has bit 30 set. If not the TjMax is 100 degrees C as diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c index 194ca0aa8b0c..ece3b7da6538 100644 --- a/drivers/hwmon/coretemp.c +++ b/drivers/hwmon/coretemp.c @@ -41,122 +41,146 @@ #define DRVNAME "coretemp" -typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL, - SHOW_NAME } SHOW; +#define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */ +#define NUM_REAL_CORES 16 /* Number of Real cores per cpu */ +#define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */ +#define MAX_ATTRS 5 /* Maximum no of per-core attrs */ +#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO) + +#ifdef CONFIG_SMP +#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) +#else +#define TO_PHYS_ID(cpu) (cpu) +#define TO_CORE_ID(cpu) (cpu) +#define TO_ATTR_NO(cpu) (cpu) +#endif /* - * Functions declaration + * 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. + * @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. */ - -static struct coretemp_data *coretemp_update_device(struct device *dev); - -struct coretemp_data { - struct device *hwmon_dev; - struct mutex update_lock; - const char *name; - u32 id; - u16 core_id; - char valid; /* zero until following fields are valid */ - unsigned long last_updated; /* in jiffies */ +struct temp_data { int temp; - int tjmax; int ttarget; - u8 alarm; + int tjmax; + unsigned long last_updated; + unsigned int cpu; + u32 cpu_core_id; + u32 status_reg; + bool is_pkg_data; + bool valid; + struct sensor_device_attribute sd_attrs[MAX_ATTRS]; + char attr_name[MAX_ATTRS][CORETEMP_NAME_LENGTH]; + struct mutex update_lock; }; -/* - * Sysfs stuff - */ +/* 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; +}; -static ssize_t show_name(struct device *dev, struct device_attribute - *devattr, char *buf) +struct pdev_entry { + struct list_head list; + struct platform_device *pdev; + unsigned int cpu; + u16 phys_proc_id; + u16 cpu_core_id; +}; + +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) { - int ret; struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); - struct coretemp_data *data = dev_get_drvdata(dev); + 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); - if (attr->index == SHOW_NAME) - ret = sprintf(buf, "%s\n", data->name); - else /* show label */ - ret = sprintf(buf, "Core %d\n", data->core_id); - return ret; + return sprintf(buf, "Core %u\n", tdata->cpu_core_id); } -static ssize_t show_alarm(struct device *dev, struct device_attribute - *devattr, char *buf) +static ssize_t show_crit_alarm(struct device *dev, + struct device_attribute *devattr, char *buf) { - struct coretemp_data *data = coretemp_update_device(dev); - /* read the Out-of-spec log, never clear */ - return sprintf(buf, "%d\n", data->alarm); + 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_temp(struct device *dev, - struct device_attribute *devattr, char *buf) +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 coretemp_data *data = coretemp_update_device(dev); - int err; + struct platform_data *pdata = dev_get_drvdata(dev); - if (attr->index == SHOW_TEMP) - err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN; - else if (attr->index == SHOW_TJMAX) - err = sprintf(buf, "%d\n", data->tjmax); - else - err = sprintf(buf, "%d\n", data->ttarget); - return err; + return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax); } -static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, - SHOW_TEMP); -static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, - SHOW_TJMAX); -static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, - SHOW_TTARGET); -static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL); -static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); -static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); - -static struct attribute *coretemp_attributes[] = { - &sensor_dev_attr_name.dev_attr.attr, - &sensor_dev_attr_temp1_label.dev_attr.attr, - &dev_attr_temp1_crit_alarm.attr, - &sensor_dev_attr_temp1_input.dev_attr.attr, - &sensor_dev_attr_temp1_crit.dev_attr.attr, - NULL -}; +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); -static const struct attribute_group coretemp_group = { - .attrs = coretemp_attributes, -}; + return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget); +} -static struct coretemp_data *coretemp_update_device(struct device *dev) +static ssize_t show_temp(struct device *dev, + struct device_attribute *devattr, char *buf) { - struct coretemp_data *data = dev_get_drvdata(dev); - - mutex_lock(&data->update_lock); + 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]; - if (!data->valid || time_after(jiffies, data->last_updated + HZ)) { - u32 eax, edx; + mutex_lock(&tdata->update_lock); - data->valid = 0; - rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); - data->alarm = (eax >> 5) & 1; - /* update only if data has been valid */ + /* 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) { - data->temp = data->tjmax - (((eax >> 16) - & 0x7f) * 1000); - data->valid = 1; - } else { - dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax); + tdata->temp = tdata->tjmax - + (((eax >> 16) & 0x7f) * 1000); + tdata->valid = 1; } - data->last_updated = jiffies; + tdata->last_updated = jiffies; } - mutex_unlock(&data->update_lock); - return data; + mutex_unlock(&tdata->update_lock); + return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN; } -static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) +static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) { /* The 100C is default for both mobile and non mobile CPUs */ @@ -244,8 +268,7 @@ static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device * return tjmax; } -static int __devinit get_tjmax(struct cpuinfo_x86 *c, u32 id, - struct device *dev) +static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) { /* The 100C is default for both mobile and non mobile CPUs */ int err; @@ -300,115 +323,293 @@ static void __devinit get_ucode_rev_on_cpu(void *edx) rdmsr(MSR_IA32_UCODE_REV, eax, *(u32 *)edx); } -static int __devinit coretemp_probe(struct platform_device *pdev) +static int get_pkg_tjmax(unsigned int cpu, struct device *dev) { - struct coretemp_data *data; - struct cpuinfo_x86 *c = &cpu_data(pdev->id); int err; - u32 eax, edx; + u32 eax, edx, val; - if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) { - err = -ENOMEM; - dev_err(&pdev->dev, "Out of memory\n"); - goto exit; + err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); + if (!err) { + val = (eax >> 16) & 0xff; + if ((val > 80) && (val < 120)) + return val * 1000; } + dev_warn(dev, "Unable to read Pkg-TjMax from CPU:%u\n", cpu); + return 100000; /* Default TjMax: 100 degree celsius */ +} - data->id = pdev->id; -#ifdef CONFIG_SMP - data->core_id = c->cpu_core_id; -#endif - data->name = "coretemp"; - mutex_init(&data->update_lock); +static int create_name_attr(struct platform_data *pdata, struct device *dev) +{ + 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); +} - /* test if we can access the THERM_STATUS MSR */ - err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); - if (err) { - dev_err(&pdev->dev, - "Unable to access THERM_STATUS MSR, giving up\n"); - goto exit_free; +static int create_core_attrs(struct temp_data *tdata, struct device *dev, + int attr_no) +{ + int err, i; + static ssize_t (*rd_ptr[MAX_ATTRS]) (struct device *dev, + struct device_attribute *devattr, char *buf) = { + show_label, show_crit_alarm, show_ttarget, + show_temp, show_tjmax }; + static const char *names[MAX_ATTRS] = { + "temp%d_label", "temp%d_crit_alarm", + "temp%d_max", "temp%d_input", + "temp%d_crit" }; + + for (i = 0; i < MAX_ATTRS; i++) { + snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH, names[i], + attr_no); + 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].dev_attr.store = NULL; + tdata->sd_attrs[i].index = attr_no; + err = device_create_file(dev, &tdata->sd_attrs[i].dev_attr); + if (err) + goto exit_free; } + return 0; + +exit_free: + while (--i >= 0) + device_remove_file(dev, &tdata->sd_attrs[i].dev_attr); + return err; +} + +static void update_ttarget(__u8 cpu_model, struct temp_data *tdata, + struct device *dev) +{ + int err; + u32 eax, edx; + + /* + * Initialize ttarget value. Eventually this will be + * initialized with the value from MSR_IA32_THERM_INTERRUPT + * register. If IA32_TEMPERATURE_TARGET is supported, this + * value will be over written below. + * To Do: Patch to initialize ttarget from MSR_IA32_THERM_INTERRUPT + */ + tdata->ttarget = tdata->tjmax - 20000; - /* 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). - */ + /* + * Read the still undocumented IA32_TEMPERATURE_TARGET. It exists + * on older CPUs but not in this register, + * Atoms don't have it either. + */ + if ((cpu_model > 0xe) && (cpu_model != 0x1c)) { + err = rdmsr_safe_on_cpu(tdata->cpu, + MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); + if (err) { + dev_warn(dev, + "Unable to read IA32_TEMPERATURE_TARGET MSR\n"); + } else { + tdata->ttarget = tdata->tjmax - + (((eax >> 8) & 0xff) * 1000); + } + } +} + +static int chk_ucode_version(struct platform_device *pdev) +{ + struct cpuinfo_x86 *c = &cpu_data(pdev->id); + int err; + u32 edx; + /* + * 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)) { /* check for microcode update */ - err = smp_call_function_single(data->id, get_ucode_rev_on_cpu, + err = smp_call_function_single(pdev->id, get_ucode_rev_on_cpu, &edx, 1); if (err) { dev_err(&pdev->dev, "Cannot determine microcode revision of " - "CPU#%u (%d)!\n", data->id, err); - err = -ENODEV; - goto exit_free; + "CPU#%u (%d)!\n", pdev->id, err); + return -ENODEV; } else if (edx < 0x39) { - err = -ENODEV; dev_err(&pdev->dev, "Errata AE18 not fixed, update BIOS or " "microcode of the CPU!\n"); - goto exit_free; + 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); + mutex_init(&tdata->update_lock); + return tdata; +} - data->tjmax = get_tjmax(c, data->id, &pdev->dev); - platform_set_drvdata(pdev, data); +static int create_core_data(struct platform_data *pdata, + struct platform_device *pdev, + unsigned int cpu, int pkg_flag) +{ + struct temp_data *tdata; + struct cpuinfo_x86 *c = &cpu_data(cpu); + u32 eax, edx; + int err, attr_no; /* - * read the still undocumented IA32_TEMPERATURE_TARGET. It exists - * on older CPUs but not in this register, - * Atoms don't have it either. + * 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 ((c->x86_model > 0xe) && (c->x86_model != 0x1c)) { - err = rdmsr_safe_on_cpu(data->id, MSR_IA32_TEMPERATURE_TARGET, - &eax, &edx); - if (err) { - dev_warn(&pdev->dev, "Unable to read" - " IA32_TEMPERATURE_TARGET MSR\n"); - } else { - data->ttarget = data->tjmax - - (((eax >> 8) & 0xff) * 1000); - err = device_create_file(&pdev->dev, - &sensor_dev_attr_temp1_max.dev_attr); - if (err) - goto exit_free; - } - } + if (attr_no > MAX_CORE_DATA - 1) + return -ERANGE; + + /* Skip if it is a HT core, Not an error */ + if (pdata->core_data[attr_no] != NULL) + return 0; - if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group))) - goto exit_dev; + tdata = init_temp_data(cpu, pkg_flag); + if (!tdata) + return -ENOMEM; - data->hwmon_dev = hwmon_device_register(&pdev->dev); - if (IS_ERR(data->hwmon_dev)) { - err = PTR_ERR(data->hwmon_dev); - dev_err(&pdev->dev, "Class registration failed (%d)\n", - err); - goto exit_class; - } + /* 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 */ + if (pkg_flag) + tdata->tjmax = get_pkg_tjmax(pdev->id, &pdev->dev); + else + tdata->tjmax = get_tjmax(c, cpu, &pdev->dev); + + update_ttarget(c->x86_model, tdata, &pdev->dev); + pdata->core_data[attr_no] = tdata; + + /* Create sysfs interfaces */ + err = create_core_attrs(tdata, &pdev->dev, attr_no); + if (err) + goto exit_free; return 0; +exit_free: + kfree(tdata); + return err; +} + +static void coretemp_add_core(unsigned int cpu, int pkg_flag) +{ + struct platform_data *pdata; + struct platform_device *pdev = coretemp_get_pdev(cpu); + int err; + + if (!pdev) + return; + + pdata = platform_get_drvdata(pdev); + + err = create_core_data(pdata, 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, + struct device *dev, int indx) +{ + int i; + struct temp_data *tdata = pdata->core_data[indx]; + + /* Remove the sysfs attributes */ + for (i = 0; i < MAX_ATTRS; i++) + device_remove_file(dev, &tdata->sd_attrs[i].dev_attr); + + kfree(pdata->core_data[indx]); + pdata->core_data[indx] = NULL; +} + +static int __devinit coretemp_probe(struct platform_device *pdev) +{ + struct platform_data *pdata; + int err; -exit_class: - sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); -exit_dev: - device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr); + /* Check the microcode version of the CPU */ + err = chk_ucode_version(pdev); + if (err) + return err; + + /* Initialize the per-package data structures */ + pdata = kzalloc(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 = TO_PHYS_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); + platform_set_drvdata(pdev, NULL); exit_free: - kfree(data); -exit: + kfree(pdata); return err; } static int __devexit coretemp_remove(struct platform_device *pdev) { - struct coretemp_data *data = platform_get_drvdata(pdev); + struct platform_data *pdata = platform_get_drvdata(pdev); + int i; - hwmon_device_unregister(data->hwmon_dev); - sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); - device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr); + for (i = MAX_CORE_DATA - 1; i >= 0; --i) + if (pdata->core_data[i]) + coretemp_remove_core(pdata, &pdev->dev, i); + + device_remove_file(&pdev->dev, &pdata->name_attr); + hwmon_device_unregister(pdata->hwmon_dev); platform_set_drvdata(pdev, NULL); - kfree(data); + kfree(pdata); return 0; } @@ -421,50 +622,14 @@ static struct platform_driver coretemp_driver = { .remove = __devexit_p(coretemp_remove), }; -struct pdev_entry { - struct list_head list; - struct platform_device *pdev; - unsigned int cpu; -#ifdef CONFIG_SMP - u16 phys_proc_id; - u16 cpu_core_id; -#endif -}; - -static LIST_HEAD(pdev_list); -static DEFINE_MUTEX(pdev_list_mutex); - static int __cpuinit coretemp_device_add(unsigned int cpu) { int err; struct platform_device *pdev; struct pdev_entry *pdev_entry; - struct cpuinfo_x86 *c = &cpu_data(cpu); - - /* - * 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_DTS)) { - pr_info("CPU (model=0x%x) has no thermal sensor\n", - c->x86_model); - return 0; - } mutex_lock(&pdev_list_mutex); -#ifdef CONFIG_SMP - /* Skip second HT entry of each core */ - list_for_each_entry(pdev_entry, &pdev_list, list) { - if (c->phys_proc_id == pdev_entry->phys_proc_id && - c->cpu_core_id == pdev_entry->cpu_core_id) { - err = 0; /* Not an error */ - goto exit; - } - } -#endif - pdev = platform_device_alloc(DRVNAME, cpu); if (!pdev) { err = -ENOMEM; @@ -486,10 +651,9 @@ static int __cpuinit coretemp_device_add(unsigned int cpu) pdev_entry->pdev = pdev; pdev_entry->cpu = cpu; -#ifdef CONFIG_SMP - pdev_entry->phys_proc_id = c->phys_proc_id; - pdev_entry->cpu_core_id = c->cpu_core_id; -#endif + pdev_entry->phys_proc_id = TO_PHYS_ID(cpu); + pdev_entry->cpu_core_id = TO_CORE_ID(cpu); + list_add_tail(&pdev_entry->list, &pdev_list); mutex_unlock(&pdev_list_mutex); @@ -504,28 +668,108 @@ exit: return err; } -static void __cpuinit coretemp_device_remove(unsigned int cpu) +static void coretemp_device_remove(unsigned int cpu) { - struct pdev_entry *p; - unsigned int i; + struct pdev_entry *p, *n; + u16 phys_proc_id = TO_PHYS_ID(cpu); mutex_lock(&pdev_list_mutex); - list_for_each_entry(p, &pdev_list, list) { - if (p->cpu != cpu) + 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); - mutex_unlock(&pdev_list_mutex); kfree(p); - for_each_cpu(i, cpu_sibling_mask(cpu)) - if (i != cpu && !coretemp_device_add(i)) - break; - return; } 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 __cpuinit 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_DTS)) + return; + + if (!pdev) { + /* + * 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 __cpuinit 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); + + if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu) + coretemp_remove_core(pdata, &pdev->dev, indx); + + /* Online the HT version of this core, if any */ + for_each_cpu(i, cpu_sibling_mask(cpu)) { + if (i != cpu) { + get_core_online(i); + 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 __cpuinit coretemp_cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { @@ -534,10 +778,10 @@ static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb, switch (action) { case CPU_ONLINE: case CPU_DOWN_FAILED: - coretemp_device_add(cpu); + get_core_online(cpu); break; case CPU_DOWN_PREPARE: - coretemp_device_remove(cpu); + put_core_offline(cpu); break; } return NOTIFY_OK; @@ -547,6 +791,7 @@ static struct notifier_block coretemp_cpu_notifier __refdata = { .notifier_call = coretemp_cpu_callback, }; + static int __init coretemp_init(void) { int i, err = -ENODEV; @@ -560,7 +805,7 @@ static int __init coretemp_init(void) goto exit; for_each_online_cpu(i) - coretemp_device_add(i); + get_core_online(i); #ifndef CONFIG_HOTPLUG_CPU if (list_empty(&pdev_list)) { |
