*
*/
-
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
+#include <linux/slab.h>
-#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-
-#include <asm/uaccess.h>
+#ifdef CONFIG_X86
+#include <asm/cpufeature.h>
#endif
#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
#include <acpi/processor.h>
+#define PREFIX "ACPI: "
-#define ACPI_PROCESSOR_COMPONENT 0x01000000
#define ACPI_PROCESSOR_CLASS "processor"
-#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
-ACPI_MODULE_NAME ("acpi_processor")
+ACPI_MODULE_NAME("processor_perflib");
+static DEFINE_MUTEX(performance_mutex);
-static DECLARE_MUTEX(performance_sem);
+/* Use cpufreq debug layer for _PPC changes. */
+#define cpufreq_printk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_CORE, \
+ "cpufreq-core", msg)
/*
* _PPC support is implemented as a CPUfreq policy notifier:
* policy is adjusted accordingly.
*/
+/* ignore_ppc:
+ * -1 -> cpufreq low level drivers not initialized -> _PSS, etc. not called yet
+ * ignore _PPC
+ * 0 -> cpufreq low level drivers initialized -> consider _PPC values
+ * 1 -> ignore _PPC totally -> forced by user through boot param
+ */
+static int ignore_ppc = -1;
+module_param(ignore_ppc, int, 0644);
+MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
+ "limited by BIOS, this should help");
+
#define PPC_REGISTERED 1
#define PPC_IN_USE 2
-static int acpi_processor_ppc_status = 0;
+static int acpi_processor_ppc_status;
static int acpi_processor_ppc_notifier(struct notifier_block *nb,
- unsigned long event,
- void *data)
+ unsigned long event, void *data)
{
struct cpufreq_policy *policy = data;
struct acpi_processor *pr;
unsigned int ppc = 0;
- down(&performance_sem);
+ if (event == CPUFREQ_START && ignore_ppc <= 0) {
+ ignore_ppc = 0;
+ return 0;
+ }
+
+ if (ignore_ppc)
+ return 0;
if (event != CPUFREQ_INCOMPATIBLE)
- goto out;
+ return 0;
+
+ mutex_lock(&performance_mutex);
- pr = processors[policy->cpu];
+ pr = per_cpu(processors, policy->cpu);
if (!pr || !pr->performance)
goto out;
- ppc = (unsigned int) pr->performance_platform_limit;
- if (!ppc)
- goto out;
+ ppc = (unsigned int)pr->performance_platform_limit;
- if (ppc > pr->performance->state_count)
+ if (ppc >= pr->performance->state_count)
goto out;
cpufreq_verify_within_limits(policy, 0,
- pr->performance->states[ppc].core_frequency * 1000);
+ pr->performance->states[ppc].
+ core_frequency * 1000);
- out:
- up(&performance_sem);
+ out:
+ mutex_unlock(&performance_mutex);
return 0;
}
-
static struct notifier_block acpi_ppc_notifier_block = {
.notifier_call = acpi_processor_ppc_notifier,
};
-
-static int
-acpi_processor_get_platform_limit (
- struct acpi_processor* pr)
+static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
{
- acpi_status status = 0;
- unsigned long ppc = 0;
+ acpi_status status = 0;
+ unsigned long long ppc = 0;
- ACPI_FUNCTION_TRACE("acpi_processor_get_platform_limit");
if (!pr)
- return_VALUE(-EINVAL);
+ return -EINVAL;
/*
* _PPC indicates the maximum state currently supported by the platform
if (status != AE_NOT_FOUND)
acpi_processor_ppc_status |= PPC_IN_USE;
- if(ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PPC\n"));
- return_VALUE(-ENODEV);
+ if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
+ return -ENODEV;
}
- pr->performance_platform_limit = (int) ppc;
+ cpufreq_printk("CPU %d: _PPC is %d - frequency %s limited\n", pr->id,
+ (int)ppc, ppc ? "" : "not");
+
+ pr->performance_platform_limit = (int)ppc;
- return_VALUE(0);
+ return 0;
}
+#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
+/*
+ * acpi_processor_ppc_ost: Notify firmware the _PPC evaluation status
+ * @handle: ACPI processor handle
+ * @status: the status code of _PPC evaluation
+ * 0: success. OSPM is now using the performance state specificed.
+ * 1: failure. OSPM has not changed the number of P-states in use
+ */
+static void acpi_processor_ppc_ost(acpi_handle handle, int status)
+{
+ union acpi_object params[2] = {
+ {.type = ACPI_TYPE_INTEGER,},
+ {.type = ACPI_TYPE_INTEGER,},
+ };
+ struct acpi_object_list arg_list = {2, params};
+ acpi_handle temp;
+
+ params[0].integer.value = ACPI_PROCESSOR_NOTIFY_PERFORMANCE;
+ params[1].integer.value = status;
+
+ /* when there is no _OST , skip it */
+ if (ACPI_FAILURE(acpi_get_handle(handle, "_OST", &temp)))
+ return;
+
+ acpi_evaluate_object(handle, "_OST", &arg_list, NULL);
+ return;
+}
-int acpi_processor_ppc_has_changed(
- struct acpi_processor *pr)
+int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag)
{
- int ret = acpi_processor_get_platform_limit(pr);
+ int ret;
+
+ if (ignore_ppc) {
+ /*
+ * Only when it is notification event, the _OST object
+ * will be evaluated. Otherwise it is skipped.
+ */
+ if (event_flag)
+ acpi_processor_ppc_ost(pr->handle, 1);
+ return 0;
+ }
+
+ ret = acpi_processor_get_platform_limit(pr);
+ /*
+ * Only when it is notification event, the _OST object
+ * will be evaluated. Otherwise it is skipped.
+ */
+ if (event_flag) {
+ if (ret < 0)
+ acpi_processor_ppc_ost(pr->handle, 1);
+ else
+ acpi_processor_ppc_ost(pr->handle, 0);
+ }
if (ret < 0)
return (ret);
else
return cpufreq_update_policy(pr->id);
}
+int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
+{
+ struct acpi_processor *pr;
+
+ pr = per_cpu(processors, cpu);
+ if (!pr || !pr->performance || !pr->performance->state_count)
+ return -ENODEV;
+ *limit = pr->performance->states[pr->performance_platform_limit].
+ core_frequency * 1000;
+ return 0;
+}
+EXPORT_SYMBOL(acpi_processor_get_bios_limit);
-void acpi_processor_ppc_init(void) {
- if (!cpufreq_register_notifier(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
+void acpi_processor_ppc_init(void)
+{
+ if (!cpufreq_register_notifier
+ (&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
acpi_processor_ppc_status |= PPC_REGISTERED;
else
- printk(KERN_DEBUG "Warning: Processor Platform Limit not supported.\n");
+ printk(KERN_DEBUG
+ "Warning: Processor Platform Limit not supported.\n");
}
-
-void acpi_processor_ppc_exit(void) {
+void acpi_processor_ppc_exit(void)
+{
if (acpi_processor_ppc_status & PPC_REGISTERED)
- cpufreq_unregister_notifier(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER);
+ cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
+ CPUFREQ_POLICY_NOTIFIER);
acpi_processor_ppc_status &= ~PPC_REGISTERED;
}
-/*
- * when registering a cpufreq driver with this ACPI processor driver, the
- * _PCT and _PSS structures are read out and written into struct
- * acpi_processor_performance.
- */
-static int acpi_processor_set_pdc (struct acpi_processor *pr)
-{
- acpi_status status = AE_OK;
- u32 arg0_buf[3];
- union acpi_object arg0 = {ACPI_TYPE_BUFFER};
- struct acpi_object_list no_object = {1, &arg0};
- struct acpi_object_list *pdc;
-
- ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
-
- arg0.buffer.length = 12;
- arg0.buffer.pointer = (u8 *) arg0_buf;
- arg0_buf[0] = ACPI_PDC_REVISION_ID;
- arg0_buf[1] = 0;
- arg0_buf[2] = 0;
-
- pdc = (pr->performance->pdc) ? pr->performance->pdc : &no_object;
-
- status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
-
- if ((ACPI_FAILURE(status)) && (pr->performance->pdc))
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Error evaluating _PDC, using legacy perf. control...\n"));
-
- return_VALUE(status);
-}
-
-
-static int
-acpi_processor_get_performance_control (
- struct acpi_processor *pr)
+static int acpi_processor_get_performance_control(struct acpi_processor *pr)
{
- int result = 0;
- acpi_status status = 0;
- struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
- union acpi_object *pct = NULL;
- union acpi_object obj = {0};
+ int result = 0;
+ acpi_status status = 0;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ union acpi_object *pct = NULL;
+ union acpi_object obj = { 0 };
- ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");
status = acpi_evaluate_object(pr->handle, "_PCT", NULL, &buffer);
- if(ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n"));
- return_VALUE(-ENODEV);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PCT"));
+ return -ENODEV;
}
- pct = (union acpi_object *) buffer.pointer;
+ pct = (union acpi_object *)buffer.pointer;
if (!pct || (pct->type != ACPI_TYPE_PACKAGE)
- || (pct->package.count != 2)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PCT data\n"));
+ || (pct->package.count != 2)) {
+ printk(KERN_ERR PREFIX "Invalid _PCT data\n");
result = -EFAULT;
goto end;
}
obj = pct->package.elements[0];
if ((obj.type != ACPI_TYPE_BUFFER)
- || (obj.buffer.length < sizeof(struct acpi_pct_register))
- || (obj.buffer.pointer == NULL)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Invalid _PCT data (control_register)\n"));
+ || (obj.buffer.length < sizeof(struct acpi_pct_register))
+ || (obj.buffer.pointer == NULL)) {
+ printk(KERN_ERR PREFIX "Invalid _PCT data (control_register)\n");
result = -EFAULT;
goto end;
}
- memcpy(&pr->performance->control_register, obj.buffer.pointer, sizeof(struct acpi_pct_register));
-
+ memcpy(&pr->performance->control_register, obj.buffer.pointer,
+ sizeof(struct acpi_pct_register));
/*
* status_register
obj = pct->package.elements[1];
if ((obj.type != ACPI_TYPE_BUFFER)
- || (obj.buffer.length < sizeof(struct acpi_pct_register))
- || (obj.buffer.pointer == NULL)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Invalid _PCT data (status_register)\n"));
+ || (obj.buffer.length < sizeof(struct acpi_pct_register))
+ || (obj.buffer.pointer == NULL)) {
+ printk(KERN_ERR PREFIX "Invalid _PCT data (status_register)\n");
result = -EFAULT;
goto end;
}
- memcpy(&pr->performance->status_register, obj.buffer.pointer, sizeof(struct acpi_pct_register));
+ memcpy(&pr->performance->status_register, obj.buffer.pointer,
+ sizeof(struct acpi_pct_register));
-end:
- acpi_os_free(buffer.pointer);
+ end:
+ kfree(buffer.pointer);
- return_VALUE(result);
+ return result;
}
-
-static int
-acpi_processor_get_performance_states (
- struct acpi_processor *pr)
+static int acpi_processor_get_performance_states(struct acpi_processor *pr)
{
- int result = 0;
- acpi_status status = AE_OK;
- struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
- struct acpi_buffer format = {sizeof("NNNNNN"), "NNNNNN"};
- struct acpi_buffer state = {0, NULL};
- union acpi_object *pss = NULL;
- int i;
+ int result = 0;
+ acpi_status status = AE_OK;
+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
+ struct acpi_buffer format = { sizeof("NNNNNN"), "NNNNNN" };
+ struct acpi_buffer state = { 0, NULL };
+ union acpi_object *pss = NULL;
+ int i;
- ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");
status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
- if(ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n"));
- return_VALUE(-ENODEV);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PSS"));
+ return -ENODEV;
}
- pss = (union acpi_object *) buffer.pointer;
+ pss = buffer.pointer;
if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
+ printk(KERN_ERR PREFIX "Invalid _PSS data\n");
result = -EFAULT;
goto end;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
- pss->package.count));
+ pss->package.count));
pr->performance->state_count = pss->package.count;
- pr->performance->states = kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, GFP_KERNEL);
+ pr->performance->states =
+ kmalloc(sizeof(struct acpi_processor_px) * pss->package.count,
+ GFP_KERNEL);
if (!pr->performance->states) {
result = -ENOMEM;
goto end;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
status = acpi_extract_package(&(pss->package.elements[i]),
- &format, &state);
+ &format, &state);
if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
+ ACPI_EXCEPTION((AE_INFO, status, "Invalid _PSS data"));
result = -EFAULT;
kfree(pr->performance->states);
goto end;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
- i,
- (u32) px->core_frequency,
- (u32) px->power,
- (u32) px->transition_latency,
- (u32) px->bus_master_latency,
- (u32) px->control,
- (u32) px->status));
-
- if (!px->core_frequency) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data: freq is zero\n"));
+ "State [%d]: core_frequency[%d] power[%d] transition_latency[%d] bus_master_latency[%d] control[0x%x] status[0x%x]\n",
+ i,
+ (u32) px->core_frequency,
+ (u32) px->power,
+ (u32) px->transition_latency,
+ (u32) px->bus_master_latency,
+ (u32) px->control, (u32) px->status));
+
+ /*
+ * Check that ACPI's u64 MHz will be valid as u32 KHz in cpufreq
+ */
+ if (!px->core_frequency ||
+ ((u32)(px->core_frequency * 1000) !=
+ (px->core_frequency * 1000))) {
+ printk(KERN_ERR FW_BUG PREFIX
+ "Invalid BIOS _PSS frequency: 0x%llx MHz\n",
+ px->core_frequency);
result = -EFAULT;
kfree(pr->performance->states);
goto end;
}
}
-end:
- acpi_os_free(buffer.pointer);
+ end:
+ kfree(buffer.pointer);
- return_VALUE(result);
+ return result;
}
-
-static int
-acpi_processor_get_performance_info (
- struct acpi_processor *pr)
+static int acpi_processor_get_performance_info(struct acpi_processor *pr)
{
- int result = 0;
- acpi_status status = AE_OK;
- acpi_handle handle = NULL;
-
- ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");
+ int result = 0;
+ acpi_status status = AE_OK;
+ acpi_handle handle = NULL;
if (!pr || !pr->performance || !pr->handle)
- return_VALUE(-EINVAL);
-
- acpi_processor_set_pdc(pr);
+ return -EINVAL;
status = acpi_get_handle(pr->handle, "_PCT", &handle);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "ACPI-based processor performance control unavailable\n"));
- return_VALUE(-ENODEV);
+ "ACPI-based processor performance control unavailable\n"));
+ return -ENODEV;
}
result = acpi_processor_get_performance_control(pr);
if (result)
- return_VALUE(result);
+ goto update_bios;
result = acpi_processor_get_performance_states(pr);
if (result)
- return_VALUE(result);
+ goto update_bios;
- result = acpi_processor_get_platform_limit(pr);
- if (result)
- return_VALUE(result);
+ /* We need to call _PPC once when cpufreq starts */
+ if (ignore_ppc != 1)
+ result = acpi_processor_get_platform_limit(pr);
- return_VALUE(0);
-}
+ return result;
+ /*
+ * Having _PPC but missing frequencies (_PSS, _PCT) is a very good hint that
+ * the BIOS is older than the CPU and does not know its frequencies
+ */
+ update_bios:
+#ifdef CONFIG_X86
+ if (ACPI_SUCCESS(acpi_get_handle(pr->handle, "_PPC", &handle))){
+ if(boot_cpu_has(X86_FEATURE_EST))
+ printk(KERN_WARNING FW_BUG "BIOS needs update for CPU "
+ "frequency support\n");
+ }
+#endif
+ return result;
+}
-int acpi_processor_notify_smm(struct module *calling_module) {
- acpi_status status;
- static int is_done = 0;
+int acpi_processor_notify_smm(struct module *calling_module)
+{
+ acpi_status status;
+ static int is_done = 0;
- ACPI_FUNCTION_TRACE("acpi_processor_notify_smm");
if (!(acpi_processor_ppc_status & PPC_REGISTERED))
- return_VALUE(-EBUSY);
+ return -EBUSY;
if (!try_module_get(calling_module))
- return_VALUE(-EINVAL);
+ return -EINVAL;
/* is_done is set to negative if an error occured,
* and to postitive if _no_ error occured, but SMM
*/
if (is_done > 0) {
module_put(calling_module);
- return_VALUE(0);
- }
- else if (is_done < 0) {
+ return 0;
+ } else if (is_done < 0) {
module_put(calling_module);
- return_VALUE(is_done);
+ return is_done;
}
is_done = -EIO;
- /* Can't write pstate_cnt to smi_cmd if either value is zero */
- if ((!acpi_fadt.smi_cmd) ||
- (!acpi_fadt.pstate_cnt)) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "No SMI port or pstate_cnt\n"));
+ /* Can't write pstate_control to smi_command if either value is zero */
+ if ((!acpi_gbl_FADT.smi_command) || (!acpi_gbl_FADT.pstate_control)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No SMI port or pstate_control\n"));
module_put(calling_module);
- return_VALUE(0);
+ return 0;
}
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Writing pstate_cnt [0x%x] to smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
-
- /* FADT v1 doesn't support pstate_cnt, many BIOS vendors use
- * it anyway, so we need to support it... */
- if (acpi_fadt_is_v1) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Using v1.0 FADT reserved value for pstate_cnt\n"));
- }
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Writing pstate_control [0x%x] to smi_command [0x%x]\n",
+ acpi_gbl_FADT.pstate_control, acpi_gbl_FADT.smi_command));
- status = acpi_os_write_port (acpi_fadt.smi_cmd,
- (u32) acpi_fadt.pstate_cnt, 8);
- if (ACPI_FAILURE (status)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Failed to write pstate_cnt [0x%x] to "
- "smi_cmd [0x%x]\n", acpi_fadt.pstate_cnt, acpi_fadt.smi_cmd));
+ status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
+ (u32) acpi_gbl_FADT.pstate_control, 8);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status,
+ "Failed to write pstate_control [0x%x] to "
+ "smi_command [0x%x]", acpi_gbl_FADT.pstate_control,
+ acpi_gbl_FADT.smi_command));
module_put(calling_module);
- return_VALUE(status);
+ return status;
}
/* Success. If there's no _PPC, we need to fear nothing, so
if (!(acpi_processor_ppc_status & PPC_IN_USE))
module_put(calling_module);
- return_VALUE(0);
+ return 0;
}
+
EXPORT_SYMBOL(acpi_processor_notify_smm);
+static int acpi_processor_get_psd(struct acpi_processor *pr)
+{
+ int result = 0;
+ acpi_status status = AE_OK;
+ struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+ struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
+ struct acpi_buffer state = {0, NULL};
+ union acpi_object *psd = NULL;
+ struct acpi_psd_package *pdomain;
+
+ status = acpi_evaluate_object(pr->handle, "_PSD", NULL, &buffer);
+ if (ACPI_FAILURE(status)) {
+ return -ENODEV;
+ }
-#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
-/* /proc/acpi/processor/../performance interface (DEPRECATED) */
+ psd = buffer.pointer;
+ if (!psd || (psd->type != ACPI_TYPE_PACKAGE)) {
+ printk(KERN_ERR PREFIX "Invalid _PSD data\n");
+ result = -EFAULT;
+ goto end;
+ }
-static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file);
-static struct file_operations acpi_processor_perf_fops = {
- .open = acpi_processor_perf_open_fs,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
+ if (psd->package.count != 1) {
+ printk(KERN_ERR PREFIX "Invalid _PSD data\n");
+ result = -EFAULT;
+ goto end;
+ }
-static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
-{
- struct acpi_processor *pr = (struct acpi_processor *)seq->private;
- int i;
+ pdomain = &(pr->performance->domain_info);
- ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");
+ state.length = sizeof(struct acpi_psd_package);
+ state.pointer = pdomain;
- if (!pr)
+ status = acpi_extract_package(&(psd->package.elements[0]),
+ &format, &state);
+ if (ACPI_FAILURE(status)) {
+ printk(KERN_ERR PREFIX "Invalid _PSD data\n");
+ result = -EFAULT;
goto end;
+ }
- if (!pr->performance) {
- seq_puts(seq, "<not supported>\n");
+ if (pdomain->num_entries != ACPI_PSD_REV0_ENTRIES) {
+ printk(KERN_ERR PREFIX "Unknown _PSD:num_entries\n");
+ result = -EFAULT;
goto end;
}
- seq_printf(seq, "state count: %d\n"
- "active state: P%d\n",
- pr->performance->state_count,
- pr->performance->state);
-
- seq_puts(seq, "states:\n");
- for (i = 0; i < pr->performance->state_count; i++)
- seq_printf(seq, " %cP%d: %d MHz, %d mW, %d uS\n",
- (i == pr->performance->state?'*':' '), i,
- (u32) pr->performance->states[i].core_frequency,
- (u32) pr->performance->states[i].power,
- (u32) pr->performance->states[i].transition_latency);
+ if (pdomain->revision != ACPI_PSD_REV0_REVISION) {
+ printk(KERN_ERR PREFIX "Unknown _PSD:revision\n");
+ result = -EFAULT;
+ goto end;
+ }
+ if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
+ pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
+ pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
+ printk(KERN_ERR PREFIX "Invalid _PSD:coord_type\n");
+ result = -EFAULT;
+ goto end;
+ }
end:
- return_VALUE(0);
-}
-
-static int acpi_processor_perf_open_fs(struct inode *inode, struct file *file)
-{
- return single_open(file, acpi_processor_perf_seq_show,
- PDE(inode)->data);
+ kfree(buffer.pointer);
+ return result;
}
-static ssize_t
-acpi_processor_write_performance (
- struct file *file,
- const char __user *buffer,
- size_t count,
- loff_t *data)
+int acpi_processor_preregister_performance(
+ struct acpi_processor_performance __percpu *performance)
{
- int result = 0;
- struct seq_file *m = (struct seq_file *) file->private_data;
- struct acpi_processor *pr = (struct acpi_processor *) m->private;
- struct acpi_processor_performance *perf;
- char state_string[12] = {'\0'};
- unsigned int new_state = 0;
- struct cpufreq_policy policy;
-
- ACPI_FUNCTION_TRACE("acpi_processor_write_performance");
-
- if (!pr || (count > sizeof(state_string) - 1))
- return_VALUE(-EINVAL);
-
- perf = pr->performance;
- if (!perf)
- return_VALUE(-EINVAL);
+ int count, count_target;
+ int retval = 0;
+ unsigned int i, j;
+ cpumask_var_t covered_cpus;
+ struct acpi_processor *pr;
+ struct acpi_psd_package *pdomain;
+ struct acpi_processor *match_pr;
+ struct acpi_psd_package *match_pdomain;
- if (copy_from_user(state_string, buffer, count))
- return_VALUE(-EFAULT);
+ if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
+ return -ENOMEM;
- state_string[count] = '\0';
- new_state = simple_strtoul(state_string, NULL, 0);
+ mutex_lock(&performance_mutex);
- if (new_state >= perf->state_count)
- return_VALUE(-EINVAL);
+ /*
+ * Check if another driver has already registered, and abort before
+ * changing pr->performance if it has. Check input data as well.
+ */
+ for_each_possible_cpu(i) {
+ pr = per_cpu(processors, i);
+ if (!pr) {
+ /* Look only at processors in ACPI namespace */
+ continue;
+ }
- cpufreq_get_policy(&policy, pr->id);
+ if (pr->performance) {
+ retval = -EBUSY;
+ goto err_out;
+ }
- policy.cpu = pr->id;
- policy.min = perf->states[new_state].core_frequency * 1000;
- policy.max = perf->states[new_state].core_frequency * 1000;
+ if (!performance || !per_cpu_ptr(performance, i)) {
+ retval = -EINVAL;
+ goto err_out;
+ }
+ }
- result = cpufreq_set_policy(&policy);
- if (result)
- return_VALUE(result);
+ /* Call _PSD for all CPUs */
+ for_each_possible_cpu(i) {
+ pr = per_cpu(processors, i);
+ if (!pr)
+ continue;
+
+ pr->performance = per_cpu_ptr(performance, i);
+ cpumask_set_cpu(i, pr->performance->shared_cpu_map);
+ if (acpi_processor_get_psd(pr)) {
+ retval = -EINVAL;
+ continue;
+ }
+ }
+ if (retval)
+ goto err_ret;
- return_VALUE(count);
-}
+ /*
+ * Now that we have _PSD data from all CPUs, lets setup P-state
+ * domain info.
+ */
+ for_each_possible_cpu(i) {
+ pr = per_cpu(processors, i);
+ if (!pr)
+ continue;
+
+ if (cpumask_test_cpu(i, covered_cpus))
+ continue;
+
+ pdomain = &(pr->performance->domain_info);
+ cpumask_set_cpu(i, pr->performance->shared_cpu_map);
+ cpumask_set_cpu(i, covered_cpus);
+ if (pdomain->num_processors <= 1)
+ continue;
+
+ /* Validate the Domain info */
+ count_target = pdomain->num_processors;
+ count = 1;
+ if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
+ pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
+ else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
+ pr->performance->shared_type = CPUFREQ_SHARED_TYPE_HW;
+ else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
+ pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ANY;
+
+ for_each_possible_cpu(j) {
+ if (i == j)
+ continue;
+
+ match_pr = per_cpu(processors, j);
+ if (!match_pr)
+ continue;
+
+ match_pdomain = &(match_pr->performance->domain_info);
+ if (match_pdomain->domain != pdomain->domain)
+ continue;
+
+ /* Here i and j are in the same domain */
+
+ if (match_pdomain->num_processors != count_target) {
+ retval = -EINVAL;
+ goto err_ret;
+ }
+
+ if (pdomain->coord_type != match_pdomain->coord_type) {
+ retval = -EINVAL;
+ goto err_ret;
+ }
+
+ cpumask_set_cpu(j, covered_cpus);
+ cpumask_set_cpu(j, pr->performance->shared_cpu_map);
+ count++;
+ }
-static void
-acpi_cpufreq_add_file (
- struct acpi_processor *pr)
-{
- struct proc_dir_entry *entry = NULL;
- struct acpi_device *device = NULL;
-
- ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
-
- if (acpi_bus_get_device(pr->handle, &device))
- return_VOID;
-
- /* add file 'performance' [R/W] */
- entry = create_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
- S_IFREG|S_IRUGO|S_IWUSR, acpi_device_dir(device));
- if (!entry)
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Unable to create '%s' fs entry\n",
- ACPI_PROCESSOR_FILE_PERFORMANCE));
- else {
- entry->proc_fops = &acpi_processor_perf_fops;
- entry->proc_fops->write = acpi_processor_write_performance;
- entry->data = acpi_driver_data(device);
- entry->owner = THIS_MODULE;
- }
- return_VOID;
-}
+ for_each_possible_cpu(j) {
+ if (i == j)
+ continue;
-static void
-acpi_cpufreq_remove_file (
- struct acpi_processor *pr)
-{
- struct acpi_device *device = NULL;
+ match_pr = per_cpu(processors, j);
+ if (!match_pr)
+ continue;
- ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
+ match_pdomain = &(match_pr->performance->domain_info);
+ if (match_pdomain->domain != pdomain->domain)
+ continue;
- if (acpi_bus_get_device(pr->handle, &device))
- return_VOID;
+ match_pr->performance->shared_type =
+ pr->performance->shared_type;
+ cpumask_copy(match_pr->performance->shared_cpu_map,
+ pr->performance->shared_cpu_map);
+ }
+ }
- /* remove file 'performance' */
- remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
- acpi_device_dir(device));
+err_ret:
+ for_each_possible_cpu(i) {
+ pr = per_cpu(processors, i);
+ if (!pr || !pr->performance)
+ continue;
+
+ /* Assume no coordination on any error parsing domain info */
+ if (retval) {
+ cpumask_clear(pr->performance->shared_cpu_map);
+ cpumask_set_cpu(i, pr->performance->shared_cpu_map);
+ pr->performance->shared_type = CPUFREQ_SHARED_TYPE_ALL;
+ }
+ pr->performance = NULL; /* Will be set for real in register */
+ }
- return_VOID;
+err_out:
+ mutex_unlock(&performance_mutex);
+ free_cpumask_var(covered_cpus);
+ return retval;
}
-
-#else
-static void acpi_cpufreq_add_file (struct acpi_processor *pr) { return; }
-static void acpi_cpufreq_remove_file (struct acpi_processor *pr) { return; }
-#endif /* CONFIG_X86_ACPI_CPUFREQ_PROC_INTF */
-
+EXPORT_SYMBOL(acpi_processor_preregister_performance);
int
-acpi_processor_register_performance (
- struct acpi_processor_performance * performance,
- unsigned int cpu)
+acpi_processor_register_performance(struct acpi_processor_performance
+ *performance, unsigned int cpu)
{
struct acpi_processor *pr;
- ACPI_FUNCTION_TRACE("acpi_processor_register_performance");
-
if (!(acpi_processor_ppc_status & PPC_REGISTERED))
- return_VALUE(-EINVAL);
+ return -EINVAL;
- down(&performance_sem);
+ mutex_lock(&performance_mutex);
- pr = processors[cpu];
+ pr = per_cpu(processors, cpu);
if (!pr) {
- up(&performance_sem);
- return_VALUE(-ENODEV);
+ mutex_unlock(&performance_mutex);
+ return -ENODEV;
}
if (pr->performance) {
- up(&performance_sem);
- return_VALUE(-EBUSY);
+ mutex_unlock(&performance_mutex);
+ return -EBUSY;
}
+ WARN_ON(!performance);
+
pr->performance = performance;
if (acpi_processor_get_performance_info(pr)) {
pr->performance = NULL;
- up(&performance_sem);
- return_VALUE(-EIO);
+ mutex_unlock(&performance_mutex);
+ return -EIO;
}
- acpi_cpufreq_add_file(pr);
-
- up(&performance_sem);
- return_VALUE(0);
+ mutex_unlock(&performance_mutex);
+ return 0;
}
-EXPORT_SYMBOL(acpi_processor_register_performance);
+EXPORT_SYMBOL(acpi_processor_register_performance);
void
-acpi_processor_unregister_performance (
- struct acpi_processor_performance * performance,
- unsigned int cpu)
+acpi_processor_unregister_performance(struct acpi_processor_performance
+ *performance, unsigned int cpu)
{
struct acpi_processor *pr;
- ACPI_FUNCTION_TRACE("acpi_processor_unregister_performance");
+ mutex_lock(&performance_mutex);
- down(&performance_sem);
-
- pr = processors[cpu];
+ pr = per_cpu(processors, cpu);
if (!pr) {
- up(&performance_sem);
- return_VOID;
+ mutex_unlock(&performance_mutex);
+ return;
}
- kfree(pr->performance->states);
+ if (pr->performance)
+ kfree(pr->performance->states);
pr->performance = NULL;
- acpi_cpufreq_remove_file(pr);
-
- up(&performance_sem);
+ mutex_unlock(&performance_mutex);
- return_VOID;
+ return;
}
+
EXPORT_SYMBOL(acpi_processor_unregister_performance);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff