Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
  [CPUFREQ] Fix NULL ptr regression in powernow-k8
  [CPUFREQ] Create a blacklist for processors that should not load the acpi-cpufreq module.
  [CPUFREQ] Powernow-k8: Enable more than 2 low P-states
  [CPUFREQ] remove rwsem lock from CPUFREQ_GOV_STOP call (second call site)
  [CPUFREQ] ondemand - Use global sysfs dir for tuning settings
  [CPUFREQ] Introduce global, not per core: /sys/devices/system/cpu/cpufreq
  [CPUFREQ] Bail out of cpufreq_add_dev if the link for a managed CPU got created
  [CPUFREQ] Factor out policy setting from cpufreq_add_dev
  [CPUFREQ] Factor out interface creation from cpufreq_add_dev
  [CPUFREQ] Factor out symlink creation from cpufreq_add_dev
  [CPUFREQ] cleanup up -ENOMEM handling in cpufreq_add_dev
  [CPUFREQ] Reduce scope of cpu_sys_dev in cpufreq_add_dev
  [CPUFREQ] update Doc for cpuinfo_cur_freq and scaling_cur_freq

Documentation/cpu-freq/user-guide.txt

@@ -176,7 +176,9 @@ scaling_governor,		and by "echoing" the name of another
 				work on some specific architectures or
 				processors.
 
-cpuinfo_cur_freq :		Current speed of the CPU, in KHz.
+cpuinfo_cur_freq :		Current frequency of the CPU as obtained from
+				the hardware, in KHz. This is the frequency
+				the CPU actually runs at.
 
 scaling_available_frequencies : List of available frequencies, in KHz.
 
@@ -196,7 +198,10 @@ related_cpus :			List of CPUs that need some sort of frequency
 
 scaling_driver :		Hardware driver for cpufreq.
 
-scaling_cur_freq :		Current frequency of the CPU, in KHz.
+scaling_cur_freq :		Current frequency of the CPU as determined by
+				the governor and cpufreq core, in KHz. This is
+				the frequency the kernel thinks the CPU runs
+				at.
 
 If you have selected the "userspace" governor which allows you to
 set the CPU operating frequency to a specific value, you can read out

arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c

@@ -526,6 +526,21 @@ static const struct dmi_system_id sw_any_bug_dmi_table[] = {
 	},
 	{ }
 };
+
+static int acpi_cpufreq_blacklist(struct cpuinfo_x86 *c)
+{
+	/* http://www.intel.com/Assets/PDF/specupdate/314554.pdf
+	 * AL30: A Machine Check Exception (MCE) Occurring during an
+	 * Enhanced Intel SpeedStep Technology Ratio Change May Cause
+	 * Both Processor Cores to Lock Up when HT is enabled*/
+	if (c->x86_vendor == X86_VENDOR_INTEL) {
+		if ((c->x86 == 15) &&
+		    (c->x86_model == 6) &&
+		    (c->x86_mask == 8) && smt_capable())
+			return -ENODEV;
+		}
+	return 0;
+}
 #endif
 
 static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
@@ -540,6 +555,12 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
 
 	dprintk("acpi_cpufreq_cpu_init\n");
 
+#ifdef CONFIG_SMP
+	result = acpi_cpufreq_blacklist(c);
+	if (result)
+		return result;
+#endif
+
 	data = kzalloc(sizeof(struct acpi_cpufreq_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

arch/x86/kernel/cpu/cpufreq/powernow-k8.c

@@ -605,9 +605,10 @@ static int check_pst_table(struct powernow_k8_data *data, struct pst_s *pst,
 	return 0;
 }
 
-static void invalidate_entry(struct powernow_k8_data *data, unsigned int entry)
+static void invalidate_entry(struct cpufreq_frequency_table *powernow_table,
+		unsigned int entry)
 {
-	data->powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
+	powernow_table[entry].frequency = CPUFREQ_ENTRY_INVALID;
 }
 
 static void print_basics(struct powernow_k8_data *data)
@@ -854,6 +855,10 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 		goto err_out;
 	}
 
+	/* fill in data */
+	data->numps = data->acpi_data.state_count;
+	powernow_k8_acpi_pst_values(data, 0);
+
 	if (cpu_family == CPU_HW_PSTATE)
 		ret_val = fill_powernow_table_pstate(data, powernow_table);
 	else
@@ -866,11 +871,8 @@ static int powernow_k8_cpu_init_acpi(struct powernow_k8_data *data)
 	powernow_table[data->acpi_data.state_count].index = 0;
 	data->powernow_table = powernow_table;
 
-	/* fill in data */
-	data->numps = data->acpi_data.state_count;
 	if (cpumask_first(cpu_core_mask(data->cpu)) == data->cpu)
 		print_basics(data);
-	powernow_k8_acpi_pst_values(data, 0);
 
 	/* notify BIOS that we exist */
 	acpi_processor_notify_smm(THIS_MODULE);
@@ -914,13 +916,13 @@ static int fill_powernow_table_pstate(struct powernow_k8_data *data,
 					"bad value %d.\n", i, index);
 			printk(KERN_ERR PFX "Please report to BIOS "
 					"manufacturer\n");
-			invalidate_entry(data, i);
+			invalidate_entry(powernow_table, i);
 			continue;
 		}
 		rdmsr(MSR_PSTATE_DEF_BASE + index, lo, hi);
 		if (!(hi & HW_PSTATE_VALID_MASK)) {
 			dprintk("invalid pstate %d, ignoring\n", index);
-			invalidate_entry(data, i);
+			invalidate_entry(powernow_table, i);
 			continue;
 		}
 
@@ -941,7 +943,6 @@ static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
 		struct cpufreq_frequency_table *powernow_table)
 {
 	int i;
-	int cntlofreq = 0;
 
 	for (i = 0; i < data->acpi_data.state_count; i++) {
 		u32 fid;
@@ -970,7 +971,7 @@ static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
 		/* verify frequency is OK */
 		if ((freq > (MAX_FREQ * 1000)) || (freq < (MIN_FREQ * 1000))) {
 			dprintk("invalid freq %u kHz, ignoring\n", freq);
-			invalidate_entry(data, i);
+			invalidate_entry(powernow_table, i);
 			continue;
 		}
 
@@ -978,38 +979,17 @@ static int fill_powernow_table_fidvid(struct powernow_k8_data *data,
 		 * BIOSs are using "off" to indicate invalid */
 		if (vid == VID_OFF) {
 			dprintk("invalid vid %u, ignoring\n", vid);
-			invalidate_entry(data, i);
+			invalidate_entry(powernow_table, i);
 			continue;
 		}
 
-		/* verify only 1 entry from the lo frequency table */
-		if (fid < HI_FID_TABLE_BOTTOM) {
-			if (cntlofreq) {
-				/* if both entries are the same,
-				 * ignore this one ... */
-				if ((freq != powernow_table[cntlofreq].frequency) ||
-				    (index != powernow_table[cntlofreq].index)) {
-					printk(KERN_ERR PFX
-						"Too many lo freq table "
-						"entries\n");
-					return 1;
-				}
-
-				dprintk("double low frequency table entry, "
-						"ignoring it.\n");
-				invalidate_entry(data, i);
-				continue;
-			} else
-				cntlofreq = i;
-		}
-
 		if (freq != (data->acpi_data.states[i].core_frequency * 1000)) {
 			printk(KERN_INFO PFX "invalid freq entries "
 				"%u kHz vs. %u kHz\n", freq,
 				(unsigned int)
 				(data->acpi_data.states[i].core_frequency
 				 * 1000));
-			invalidate_entry(data, i);
+			invalidate_entry(powernow_table, i);
 			continue;
 		}
 	}

drivers/cpufreq/cpufreq_ondemand.c

@@ -55,6 +55,18 @@ static unsigned int min_sampling_rate;
 #define TRANSITION_LATENCY_LIMIT		(10 * 1000 * 1000)
 
 static void do_dbs_timer(struct work_struct *work);
+static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
+				unsigned int event);
+
+#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
+static
+#endif
+struct cpufreq_governor cpufreq_gov_ondemand = {
+       .name                   = "ondemand",
+       .governor               = cpufreq_governor_dbs,
+       .max_transition_latency = TRANSITION_LATENCY_LIMIT,
+       .owner                  = THIS_MODULE,
+};
 
 /* Sampling types */
 enum {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE};
@@ -207,20 +219,23 @@ static void ondemand_powersave_bias_init(void)
 }
 
 /************************** sysfs interface ************************/
-static ssize_t show_sampling_rate_max(struct cpufreq_policy *policy, char *buf)
+
+static ssize_t show_sampling_rate_max(struct kobject *kobj,
+				      struct attribute *attr, char *buf)
 {
 	printk_once(KERN_INFO "CPUFREQ: ondemand sampling_rate_max "
 	       "sysfs file is deprecated - used by: %s\n", current->comm);
 	return sprintf(buf, "%u\n", -1U);
 }
 
-static ssize_t show_sampling_rate_min(struct cpufreq_policy *policy, char *buf)
+static ssize_t show_sampling_rate_min(struct kobject *kobj,
+				      struct attribute *attr, char *buf)
 {
 	return sprintf(buf, "%u\n", min_sampling_rate);
 }
 
 #define define_one_ro(_name)		\
-static struct freq_attr _name =		\
+static struct global_attr _name =	\
 __ATTR(_name, 0444, show_##_name, NULL)
 
 define_one_ro(sampling_rate_max);
@@ -229,7 +244,7 @@ define_one_ro(sampling_rate_min);
 /* cpufreq_ondemand Governor Tunables */
 #define show_one(file_name, object)					\
 static ssize_t show_##file_name						\
-(struct cpufreq_policy *unused, char *buf)				\
+(struct kobject *kobj, struct attribute *attr, char *buf)              \
 {									\
 	return sprintf(buf, "%u\n", dbs_tuners_ins.object);		\
 }
@@ -238,8 +253,38 @@ show_one(up_threshold, up_threshold);
 show_one(ignore_nice_load, ignore_nice);
 show_one(powersave_bias, powersave_bias);
 
-static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
-		const char *buf, size_t count)
+/*** delete after deprecation time ***/
+
+#define DEPRECATION_MSG(file_name)					\
+	printk_once(KERN_INFO "CPUFREQ: Per core ondemand sysfs "	\
+		    "interface is deprecated - " #file_name "\n");
+
+#define show_one_old(file_name)						\
+static ssize_t show_##file_name##_old					\
+(struct cpufreq_policy *unused, char *buf)				\
+{									\
+	printk_once(KERN_INFO "CPUFREQ: Per core ondemand sysfs "	\
+		    "interface is deprecated - " #file_name "\n");	\
+	return show_##file_name(NULL, NULL, buf);			\
+}
+show_one_old(sampling_rate);
+show_one_old(up_threshold);
+show_one_old(ignore_nice_load);
+show_one_old(powersave_bias);
+show_one_old(sampling_rate_min);
+show_one_old(sampling_rate_max);
+
+#define define_one_ro_old(object, _name)       \
+static struct freq_attr object =               \
+__ATTR(_name, 0444, show_##_name##_old, NULL)
+
+define_one_ro_old(sampling_rate_min_old, sampling_rate_min);
+define_one_ro_old(sampling_rate_max_old, sampling_rate_max);
+
+/*** delete after deprecation time ***/
+
+static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b,
+				   const char *buf, size_t count)
 {
 	unsigned int input;
 	int ret;
@@ -254,8 +299,8 @@ static ssize_t store_sampling_rate(struct cpufreq_policy *unused,
 	return count;
 }
 
-static ssize_t store_up_threshold(struct cpufreq_policy *unused,
-		const char *buf, size_t count)
+static ssize_t store_up_threshold(struct kobject *a, struct attribute *b,
+				  const char *buf, size_t count)
 {
 	unsigned int input;
 	int ret;
@@ -273,8 +318,8 @@ static ssize_t store_up_threshold(struct cpufreq_policy *unused,
 	return count;
 }
 
-static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
-		const char *buf, size_t count)
+static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b,
+				      const char *buf, size_t count)
 {
 	unsigned int input;
 	int ret;
@@ -310,8 +355,8 @@ static ssize_t store_ignore_nice_load(struct cpufreq_policy *policy,
 	return count;
 }
 
-static ssize_t store_powersave_bias(struct cpufreq_policy *unused,
-		const char *buf, size_t count)
+static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b,
+				    const char *buf, size_t count)
 {
 	unsigned int input;
 	int ret;
@@ -332,7 +377,7 @@ static ssize_t store_powersave_bias(struct cpufreq_policy *unused,
 }
 
 #define define_one_rw(_name) \
-static struct freq_attr _name = \
+static struct global_attr _name = \
 __ATTR(_name, 0644, show_##_name, store_##_name)
 
 define_one_rw(sampling_rate);
@@ -355,6 +400,47 @@ static struct attribute_group dbs_attr_group = {
 	.name = "ondemand",
 };
 
+/*** delete after deprecation time ***/
+
+#define write_one_old(file_name)					\
+static ssize_t store_##file_name##_old					\
+(struct cpufreq_policy *unused, const char *buf, size_t count)		\
+{									\
+       printk_once(KERN_INFO "CPUFREQ: Per core ondemand sysfs "	\
+		   "interface is deprecated - " #file_name "\n");	\
+       return store_##file_name(NULL, NULL, buf, count);		\
+}
+write_one_old(sampling_rate);
+write_one_old(up_threshold);
+write_one_old(ignore_nice_load);
+write_one_old(powersave_bias);
+
+#define define_one_rw_old(object, _name)       \
+static struct freq_attr object =               \
+__ATTR(_name, 0644, show_##_name##_old, store_##_name##_old)
+
+define_one_rw_old(sampling_rate_old, sampling_rate);
+define_one_rw_old(up_threshold_old, up_threshold);
+define_one_rw_old(ignore_nice_load_old, ignore_nice_load);
+define_one_rw_old(powersave_bias_old, powersave_bias);
+
+static struct attribute *dbs_attributes_old[] = {
+       &sampling_rate_max_old.attr,
+       &sampling_rate_min_old.attr,
+       &sampling_rate_old.attr,
+       &up_threshold_old.attr,
+       &ignore_nice_load_old.attr,
+       &powersave_bias_old.attr,
+       NULL
+};
+
+static struct attribute_group dbs_attr_group_old = {
+       .attrs = dbs_attributes_old,
+       .name = "ondemand",
+};
+
+/*** delete after deprecation time ***/
+
 /************************** sysfs end ************************/
 
 static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
@@ -545,7 +631,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 
 		mutex_lock(&dbs_mutex);
 
-		rc = sysfs_create_group(&policy->kobj, &dbs_attr_group);
+		rc = sysfs_create_group(&policy->kobj, &dbs_attr_group_old);
 		if (rc) {
 			mutex_unlock(&dbs_mutex);
 			return rc;
@@ -566,13 +652,20 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		}
 		this_dbs_info->cpu = cpu;
 		ondemand_powersave_bias_init_cpu(cpu);
-		mutex_init(&this_dbs_info->timer_mutex);
 		/*
 		 * Start the timerschedule work, when this governor
 		 * is used for first time
 		 */
 		if (dbs_enable == 1) {
 			unsigned int latency;
+
+			rc = sysfs_create_group(cpufreq_global_kobject,
+						&dbs_attr_group);
+			if (rc) {
+				mutex_unlock(&dbs_mutex);
+				return rc;
+			}
+
 			/* policy latency is in nS. Convert it to uS first */
 			latency = policy->cpuinfo.transition_latency / 1000;
 			if (latency == 0)
@@ -586,6 +679,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		}
 		mutex_unlock(&dbs_mutex);
 
+		mutex_init(&this_dbs_info->timer_mutex);
 		dbs_timer_init(this_dbs_info);
 		break;
 
@@ -593,10 +687,13 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 		dbs_timer_exit(this_dbs_info);
 
 		mutex_lock(&dbs_mutex);
-		sysfs_remove_group(&policy->kobj, &dbs_attr_group);
+		sysfs_remove_group(&policy->kobj, &dbs_attr_group_old);
 		mutex_destroy(&this_dbs_info->timer_mutex);
 		dbs_enable--;
 		mutex_unlock(&dbs_mutex);
+		if (!dbs_enable)
+			sysfs_remove_group(cpufreq_global_kobject,
+					   &dbs_attr_group);
 
 		break;
 
@@ -614,16 +711,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
 	return 0;
 }
 
-#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
-static
-#endif
-struct cpufreq_governor cpufreq_gov_ondemand = {
-	.name			= "ondemand",
-	.governor		= cpufreq_governor_dbs,
-	.max_transition_latency = TRANSITION_LATENCY_LIMIT,
-	.owner			= THIS_MODULE,
-};
-
 static int __init cpufreq_gov_dbs_init(void)
 {
 	int err;

include/linux/cpufreq.h

@@ -65,6 +65,9 @@ static inline int cpufreq_unregister_notifier(struct notifier_block *nb,
 
 struct cpufreq_governor;
 
+/* /sys/devices/system/cpu/cpufreq: entry point for global variables */
+extern struct kobject *cpufreq_global_kobject;
+
 #define CPUFREQ_ETERNAL			(-1)
 struct cpufreq_cpuinfo {
 	unsigned int		max_freq;
@@ -274,6 +277,13 @@ struct freq_attr {
 	ssize_t (*store)(struct cpufreq_policy *, const char *, size_t count);
 };
 
+struct global_attr {
+	struct attribute attr;
+	ssize_t (*show)(struct kobject *kobj,
+			struct attribute *attr, char *buf);
+	ssize_t (*store)(struct kobject *a, struct attribute *b,
+			 const char *c, size_t count);
+};
 
 /*********************************************************************
  *                        CPUFREQ 2.6. INTERFACE                     *