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Commit 0a8c7fbf authored by Len Brown's avatar Len Brown
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Merge intel.com:/home/lenb/src/linux-acpi-test-2.6.1 

into intel.com:/home/lenb/src/linux-acpi-test-2.6.2
parents 659f7c1a 1e1b8dae
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Showing with 472 additions and 440 deletions
arch/i386/kernel/cpu/cpufreq/acpi.c
View file @ 0a8c7fbf
......@@ -42,7 +42,6 @@
#define ACPI_PROCESSOR_CLASS "processor"
#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor P-States Driver"
#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME ("acpi_processor_perf")
......@@ -52,181 +51,13 @@ MODULE_DESCRIPTION(ACPI_PROCESSOR_DRIVER_NAME);
MODULE_LICENSE("GPL");
static struct acpi_processor_performance *performance[NR_CPUS];
static int
acpi_processor_get_performance_control (
struct acpi_processor_performance *perf)
{
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};
struct acpi_pct_register *reg = NULL;
ACPI_FUNCTION_TRACE("acpi_processor_get_performance_control");
status = acpi_evaluate_object(perf->pr->handle, "_PCT", NULL, &buffer);
if(ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PCT\n"));
return_VALUE(-ENODEV);
}
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"));
result = -EFAULT;
goto end;
}
/*
* control_register
*/
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"));
result = -EFAULT;
goto end;
}
reg = (struct acpi_pct_register *) (obj.buffer.pointer);
if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unsupported address space [%d] (control_register)\n",
(u32) reg->space_id));
result = -EFAULT;
goto end;
}
perf->control_register = (u16) reg->address;
perf->control_register_bit_width = reg->bit_width;
/*
* 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"));
result = -EFAULT;
goto end;
}
reg = (struct acpi_pct_register *) (obj.buffer.pointer);
if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_IO) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unsupported address space [%d] (status_register)\n",
(u32) reg->space_id));
result = -EFAULT;
goto end;
}
perf->status_register = (u16) reg->address;
perf->status_register_bit_width = reg->bit_width;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"control_register[0x%04x] status_register[0x%04x]\n",
perf->control_register,
perf->status_register));
end:
acpi_os_free(buffer.pointer);
return_VALUE(result);
}
static int
acpi_processor_get_performance_states (
struct acpi_processor_performance * perf)
{
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 = 0;
ACPI_FUNCTION_TRACE("acpi_processor_get_performance_states");
status = acpi_evaluate_object(perf->pr->handle, "_PSS", NULL, &buffer);
if(ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PSS\n"));
return_VALUE(-ENODEV);
}
pss = (union acpi_object *) buffer.pointer;
if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
result = -EFAULT;
goto end;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
pss->package.count));
if (pss->package.count > ACPI_PROCESSOR_MAX_PERFORMANCE) {
perf->state_count = ACPI_PROCESSOR_MAX_PERFORMANCE;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Limiting number of states to max (%d)\n",
ACPI_PROCESSOR_MAX_PERFORMANCE));
}
else
perf->state_count = pss->package.count;
for (i = 0; i < perf->state_count; i++) {
struct acpi_processor_px *px = &(perf->states[i]);
state.length = sizeof(struct acpi_processor_px);
state.pointer = px;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
status = acpi_extract_package(&(pss->package.elements[i]),
&format, &state);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
result = -EFAULT;
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, "core_frequency is 0\n"));
result = -EFAULT;
goto end;
}
}
struct cpufreq_acpi_io {
struct acpi_processor_performance acpi_data;
struct cpufreq_frequency_table *freq_table;
};
end:
acpi_os_free(buffer.pointer);
static struct cpufreq_acpi_io *acpi_io_data[NR_CPUS];
return_VALUE(result);
}
static int
acpi_processor_write_port(
......@@ -267,7 +98,8 @@ acpi_processor_read_port(
static int
acpi_processor_set_performance (
struct acpi_processor_performance *perf,
struct cpufreq_acpi_io *data,
unsigned int cpu,
int state)
{
u16 port = 0;
......@@ -279,28 +111,19 @@ acpi_processor_set_performance (
ACPI_FUNCTION_TRACE("acpi_processor_set_performance");
if (!perf || !perf->pr)
return_VALUE(-EINVAL);
if (state >= perf->state_count) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
"Invalid target state (P%d)\n", state));
return_VALUE(-ENODEV);
}
if (state == perf->state) {
if (state == data->acpi_data.state) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Already at target state (P%d)\n", state));
return_VALUE(0);
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Transitioning from P%d to P%d\n",
perf->state, state));
data->acpi_data.state, state));
/* cpufreq frequency struct */
cpufreq_freqs.cpu = perf->pr->id;
cpufreq_freqs.old = perf->states[perf->state].core_frequency * 1000;
cpufreq_freqs.new = perf->states[state].core_frequency * 1000;
cpufreq_freqs.cpu = cpu;
cpufreq_freqs.old = data->freq_table[data->acpi_data.state].frequency;
cpufreq_freqs.new = data->freq_table[state].frequency;
/* notify cpufreq */
cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_PRECHANGE);
......@@ -310,9 +133,9 @@ acpi_processor_set_performance (
* control_register.
*/
port = perf->control_register;
bit_width = perf->control_register_bit_width;
value = (u32) perf->states[state].control;
port = data->acpi_data.control_register.address;
bit_width = data->acpi_data.control_register.bit_width;
value = (u32) data->acpi_data.states[state].control;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Writing 0x%08x to port 0x%04x\n", value, port));
......@@ -331,12 +154,12 @@ acpi_processor_set_performance (
* giving up.
*/
port = perf->status_register;
bit_width = perf->status_register_bit_width;
port = data->acpi_data.status_register.address;
bit_width = data->acpi_data.status_register.bit_width;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Looking for 0x%08x from port 0x%04x\n",
(u32) perf->states[state].status, port));
(u32) data->acpi_data.states[state].status, port));
for (i=0; i<100; i++) {
ret = acpi_processor_read_port(port, bit_width, &value);
......@@ -345,7 +168,7 @@ acpi_processor_set_performance (
"Invalid port width 0x%04x\n", bit_width));
return_VALUE(ret);
}
if (value == (u32) perf->states[state].status)
if (value == (u32) data->acpi_data.states[state].status)
break;
udelay(10);
}
......@@ -353,7 +176,7 @@ acpi_processor_set_performance (
/* notify cpufreq */
cpufreq_notify_transition(&cpufreq_freqs, CPUFREQ_POSTCHANGE);
if (value != (u32) perf->states[state].status) {
if (value != (u32) data->acpi_data.states[state].status) {
unsigned int tmp = cpufreq_freqs.new;
cpufreq_freqs.new = cpufreq_freqs.old;
cpufreq_freqs.old = tmp;
......@@ -367,179 +190,33 @@ acpi_processor_set_performance (
"Transition successful after %d microseconds\n",
i * 10));
perf->state = state;
data->acpi_data.state = state;
return_VALUE(0);
}
#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
/* /proc/acpi/processor/../performance interface (DEPRECATED) */
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,
};
static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_processor *pr = (struct acpi_processor *)seq->private;
int i = 0;
ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");
if (!pr)
goto end;
if (!pr->performance) {
seq_puts(seq, "<not supported>\n");
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);
end:
return 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);
}
static int
acpi_processor_write_performance (
struct file *file,
const char __user *buffer,
size_t count,
loff_t *data)
{
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);
if (copy_from_user(state_string, buffer, count))
return_VALUE(-EFAULT);
state_string[count] = '\0';
new_state = simple_strtoul(state_string, NULL, 0);
if (new_state >= perf->state_count)
return_VALUE(-EINVAL);
cpufreq_get_policy(&policy, pr->id);
policy.cpu = pr->id;
policy.min = perf->states[new_state].core_frequency * 1000;
policy.max = perf->states[new_state].core_frequency * 1000;
result = cpufreq_set_policy(&policy);
if (result)
return_VALUE(result);
return_VALUE(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);
}
return_VOID;
}
static void
acpi_cpufreq_remove_file (
struct acpi_processor *pr)
{
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
if (acpi_bus_get_device(pr->handle, &device))
return_VOID;
/* remove file 'performance' */
remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
acpi_device_dir(device));
return_VOID;
}
#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 */
static int
acpi_cpufreq_target (
struct cpufreq_policy *policy,
unsigned int target_freq,
unsigned int relation)
{
struct acpi_processor_performance *perf = performance[policy->cpu];
struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
unsigned int next_state = 0;
unsigned int result = 0;
ACPI_FUNCTION_TRACE("acpi_cpufreq_setpolicy");
result = cpufreq_frequency_table_target(policy,
perf->freq_table,
result = cpufreq_frequency_table_target(policy,
data->freq_table,
target_freq,
relation,
&next_state);
if (result)
return_VALUE(result);
result = acpi_processor_set_performance (perf, next_state);
result = acpi_processor_set_performance (data, policy->cpu, next_state);
return_VALUE(result);
}
......@@ -550,89 +227,66 @@ acpi_cpufreq_verify (
struct cpufreq_policy *policy)
{
unsigned int result = 0;
struct acpi_processor_performance *perf = performance[policy->cpu];
struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
ACPI_FUNCTION_TRACE("acpi_cpufreq_verify");
result = cpufreq_frequency_table_verify(policy,
perf->freq_table);
cpufreq_verify_within_limits(
policy,
perf->states[perf->state_count - 1].core_frequency * 1000,
perf->states[0].core_frequency * 1000);
data->freq_table);
return_VALUE(result);
}
static int
acpi_processor_get_performance_info (
struct acpi_processor_performance *perf)
{
int result = 0;
acpi_status status = AE_OK;
acpi_handle handle = NULL;
ACPI_FUNCTION_TRACE("acpi_processor_get_performance_info");
if (!perf || !perf->pr || !perf->pr->handle)
return_VALUE(-EINVAL);
status = acpi_get_handle(perf->pr->handle, "_PCT", &handle);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"ACPI-based processor performance control unavailable\n"));
return_VALUE(-ENODEV);
}
result = acpi_processor_get_performance_control(perf);
if (result)
return_VALUE(result);
result = acpi_processor_get_performance_states(perf);
if (result)
return_VALUE(result);
return_VALUE(0);
}
static int
acpi_cpufreq_cpu_init (
struct cpufreq_policy *policy)
{
unsigned int i;
unsigned int cpu = policy->cpu;
struct acpi_processor_performance *perf;
struct cpufreq_acpi_io *data;
unsigned int result = 0;
ACPI_FUNCTION_TRACE("acpi_cpufreq_cpu_init");
perf = kmalloc(sizeof(struct acpi_processor_performance), GFP_KERNEL);
if (!perf)
data = kmalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL);
if (!data)
return_VALUE(-ENOMEM);
memset(perf, 0, sizeof(struct acpi_processor_performance));
memset(data, 0, sizeof(struct cpufreq_acpi_io));
performance[cpu] = perf;
acpi_io_data[cpu] = data;
result = acpi_processor_register_performance(perf, cpu);
result = acpi_processor_register_performance(&data->acpi_data, cpu);
if (result)
goto err_free;
result = acpi_processor_get_performance_info(perf);
if (result)
/* capability check */
if (data->acpi_data.state_count <= 1) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No P-States\n"));
result = -ENODEV;
goto err_unreg;
}
if ((data->acpi_data.control_register.space_id != ACPI_ADR_SPACE_SYSTEM_IO) ||
(data->acpi_data.status_register.space_id != ACPI_ADR_SPACE_SYSTEM_IO)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unsupported address space [%d, %d]\n",
(u32) (data->acpi_data.control_register.space_id),
(u32) (data->acpi_data.status_register.space_id)));
result = -ENODEV;
goto err_unreg;
}
/* capability check */
if (perf->state_count <= 1)
/* alloc freq_table */
data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * (data->acpi_data.state_count + 1), GFP_KERNEL);
if (!data->freq_table) {
result = -ENOMEM;
goto err_unreg;
}
/* detect transition latency */
policy->cpuinfo.transition_latency = 0;
for (i=0; i<perf->state_count; i++) {
if ((perf->states[i].transition_latency * 1000) > policy->cpuinfo.transition_latency)
policy->cpuinfo.transition_latency = perf->states[i].transition_latency * 1000;
for (i=0; i<data->acpi_data.state_count; i++) {
if ((data->acpi_data.states[i].transition_latency * 1000) > policy->cpuinfo.transition_latency)
policy->cpuinfo.transition_latency = data->acpi_data.states[i].transition_latency * 1000;
}
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
......@@ -640,38 +294,42 @@ acpi_cpufreq_cpu_init (
* The current speed is unknown and not detectable by ACPI... argh! Assume
* it's P0, it will be set to this value later during initialization.
*/
policy->cur = perf->states[0].core_frequency * 1000;
policy->cur = data->acpi_data.states[0].core_frequency * 1000;
/* table init */
for (i=0; i<=perf->state_count; i++)
for (i=0; i<=data->acpi_data.state_count; i++)
{
perf->freq_table[i].index = i;
if (i<perf->state_count)
perf->freq_table[i].frequency = perf->states[i].core_frequency * 1000;
data->freq_table[i].index = i;
if (i<data->acpi_data.state_count)
data->freq_table[i].frequency = data->acpi_data.states[i].core_frequency * 1000;
else
perf->freq_table[i].frequency = CPUFREQ_TABLE_END;
data->freq_table[i].frequency = CPUFREQ_TABLE_END;
}
result = cpufreq_frequency_table_cpuinfo(policy, &perf->freq_table[0]);
acpi_cpufreq_add_file(perf->pr);
result = cpufreq_frequency_table_cpuinfo(policy, &data->freq_table[0]);
if (result) {
goto err_freqfree;
}
printk(KERN_INFO "cpufreq: CPU%u - ACPI performance management activated.\n",
cpu);
for (i = 0; i < perf->state_count; i++)
for (i = 0; i < data->acpi_data.state_count; i++)
printk(KERN_INFO "cpufreq: %cP%d: %d MHz, %d mW, %d uS\n",
(i == perf->state?'*':' '), i,
(u32) perf->states[i].core_frequency,
(u32) perf->states[i].power,
(u32) perf->states[i].transition_latency);
(i == data->acpi_data.state?'*':' '), i,
(u32) data->acpi_data.states[i].core_frequency,
(u32) data->acpi_data.states[i].power,
(u32) data->acpi_data.states[i].transition_latency);
return_VALUE(result);
err_freqfree:
kfree(data->freq_table);
err_unreg:
acpi_processor_unregister_performance(perf, cpu);
acpi_processor_unregister_performance(&data->acpi_data, cpu);
err_free:
kfree(perf);
performance[cpu] = NULL;
kfree(data);
acpi_io_data[cpu] = NULL;
return_VALUE(result);
}
......@@ -681,15 +339,15 @@ static int
acpi_cpufreq_cpu_exit (
struct cpufreq_policy *policy)
{
struct acpi_processor_performance *perf = performance[policy->cpu];
struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu];
ACPI_FUNCTION_TRACE("acpi_cpufreq_cpu_exit");
if (perf) {
acpi_cpufreq_remove_file(perf->pr);
performance[policy->cpu] = NULL;
acpi_processor_unregister_performance(perf, policy->cpu);
kfree(perf);
if (data) {
acpi_io_data[policy->cpu] = NULL;
acpi_processor_unregister_performance(&data->acpi_data, policy->cpu);
kfree(data);
}
return_VALUE(0);
......
drivers/acpi/dispatcher/dsmthdat.c
View file @ 0a8c7fbf
......@@ -203,9 +203,10 @@ acpi_ds_method_data_init_args (
while ((index < ACPI_METHOD_NUM_ARGS) && (index < max_param_count) && params[index]) {
/*
* A valid parameter.
* Store the argument in the method/walk descriptor
* Store the argument in the method/walk descriptor.
* Do not copy the arg in order to implement call by reference
*/
status = acpi_ds_store_object_to_local (AML_ARG_OP, index, params[index],
status = acpi_ds_method_data_set_value (AML_ARG_OP, index, params[index],
walk_state);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
......
drivers/acpi/processor.c
View file @ 0a8c7fbf
......@@ -23,7 +23,7 @@
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* TBD:
* 1. Make # power/performance states dynamic.
* 1. Make # power states dynamic.
* 2. Support duty_cycle values that span bit 4.
* 3. Optimize by having scheduler determine business instead of
* having us try to calculate it here.
......@@ -58,6 +58,7 @@
#define ACPI_PROCESSOR_FILE_POWER "power"
#define ACPI_PROCESSOR_FILE_THROTTLING "throttling"
#define ACPI_PROCESSOR_FILE_LIMIT "limit"
#define ACPI_PROCESSOR_FILE_PERFORMANCE "performance"
#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
......@@ -855,6 +856,369 @@ static void acpi_processor_ppc_exit(void) {
acpi_processor_ppc_is_init = 0;
}
/*
* 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)
{
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);
}
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"));
result = -EFAULT;
goto end;
}
/*
* control_register
*/
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"));
result = -EFAULT;
goto end;
}
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"));
result = -EFAULT;
goto end;
}
memcpy(&pr->performance->status_register, obj.buffer.pointer, sizeof(struct acpi_pct_register));
end:
acpi_os_free(buffer.pointer);
return_VALUE(result);
}
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 = 0;
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);
}
pss = (union acpi_object *) buffer.pointer;
if (!pss || (pss->type != ACPI_TYPE_PACKAGE)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
result = -EFAULT;
goto end;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d performance states\n",
pss->package.count));
pr->performance->state_count = pss->package.count;
pr->performance->states = kmalloc(sizeof(struct acpi_processor_px) * pss->package.count, GFP_KERNEL);
if (!pr->performance->states) {
result = -ENOMEM;
goto end;
}
for (i = 0; i < pr->performance->state_count; i++) {
struct acpi_processor_px *px = &(pr->performance->states[i]);
state.length = sizeof(struct acpi_processor_px);
state.pointer = px;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
status = acpi_extract_package(&(pss->package.elements[i]),
&format, &state);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _PSS data\n"));
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, "core_frequency is 0\n"));
result = -EFAULT;
kfree(pr->performance->states);
goto end;
}
}
end:
acpi_os_free(buffer.pointer);
return_VALUE(result);
}
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");
if (!pr || !pr->performance || !pr->handle)
return_VALUE(-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_processor_set_pdc(pr);
result = acpi_processor_get_performance_control(pr);
if (result)
return_VALUE(result);
result = acpi_processor_get_performance_states(pr);
if (result)
return_VALUE(result);
result = acpi_processor_get_platform_limit(pr);
if (result)
return_VALUE(result);
return_VALUE(0);
}
#ifdef CONFIG_X86_ACPI_CPUFREQ_PROC_INTF
/* /proc/acpi/processor/../performance interface (DEPRECATED) */
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,
};
static int acpi_processor_perf_seq_show(struct seq_file *seq, void *offset)
{
struct acpi_processor *pr = (struct acpi_processor *)seq->private;
int i = 0;
ACPI_FUNCTION_TRACE("acpi_processor_perf_seq_show");
if (!pr)
goto end;
if (!pr->performance) {
seq_puts(seq, "<not supported>\n");
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);
end:
return 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);
}
static int
acpi_processor_write_performance (
struct file *file,
const char __user *buffer,
size_t count,
loff_t *data)
{
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);
if (copy_from_user(state_string, buffer, count))
return_VALUE(-EFAULT);
state_string[count] = '\0';
new_state = simple_strtoul(state_string, NULL, 0);
if (new_state >= perf->state_count)
return_VALUE(-EINVAL);
cpufreq_get_policy(&policy, pr->id);
policy.cpu = pr->id;
policy.min = perf->states[new_state].core_frequency * 1000;
policy.max = perf->states[new_state].core_frequency * 1000;
result = cpufreq_set_policy(&policy);
if (result)
return_VALUE(result);
return_VALUE(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);
}
return_VOID;
}
static void
acpi_cpufreq_remove_file (
struct acpi_processor *pr)
{
struct acpi_device *device = NULL;
ACPI_FUNCTION_TRACE("acpi_cpufreq_addfile");
if (acpi_bus_get_device(pr->handle, &device))
return_VOID;
/* remove file 'performance' */
remove_proc_entry(ACPI_PROCESSOR_FILE_PERFORMANCE,
acpi_device_dir(device));
return_VOID;
}
#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 */
int
acpi_processor_register_performance (
......@@ -882,7 +1246,14 @@ acpi_processor_register_performance (
}
pr->performance = performance;
performance->pr = pr;
if (acpi_processor_get_performance_info(pr)) {
pr->performance = NULL;
up(&performance_sem);
return_VALUE(-EIO);
}
acpi_cpufreq_add_file(pr);
up(&performance_sem);
return_VALUE(0);
......@@ -910,8 +1281,10 @@ acpi_processor_unregister_performance (
return_VOID;
}
kfree(pr->performance->states);
pr->performance = NULL;
performance->pr = NULL;
acpi_cpufreq_remove_file(pr);
up(&performance_sem);
......
include/acpi/processor.h
View file @ 0a8c7fbf
......@@ -9,8 +9,6 @@
#define ACPI_PROCESSOR_MAX_C2_LATENCY 100
#define ACPI_PROCESSOR_MAX_C3_LATENCY 1000
#define ACPI_PROCESSOR_MAX_PERFORMANCE 8
#define ACPI_PROCESSOR_MAX_THROTTLING 16
#define ACPI_PROCESSOR_MAX_THROTTLE 250 /* 25% */
#define ACPI_PROCESSOR_MAX_DUTY_WIDTH 4
......@@ -67,20 +65,22 @@ struct acpi_processor_px {
acpi_integer status; /* success indicator */
};
#define ACPI_PDC_REVISION_ID 0x1
struct acpi_processor_performance {
int state;
int platform_limit;
u16 control_register;
u16 status_register;
u8 control_register_bit_width;
u8 status_register_bit_width;
int state_count;
struct acpi_processor_px states[ACPI_PROCESSOR_MAX_PERFORMANCE];
struct cpufreq_frequency_table freq_table[ACPI_PROCESSOR_MAX_PERFORMANCE];
struct acpi_processor *pr;
unsigned int state;
unsigned int platform_limit;
struct acpi_pct_register control_register;
struct acpi_pct_register status_register;
unsigned int state_count;
struct acpi_processor_px *states;
/* the _PDC objects passed by the driver, if any */
struct acpi_object_list *pdc;
};
/* Throttling Control */
struct acpi_processor_tx {
......
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