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path: root/drivers/acpi/processor_throttling.c
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Diffstat (limited to 'drivers/acpi/processor_throttling.c')
-rw-r--r--drivers/acpi/processor_throttling.c209
1 files changed, 87 insertions, 122 deletions
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index fbc936cf2025..f9c2bc1d4a3a 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* processor_throttling.c - Throttling submodule of the ACPI processor driver
*
@@ -5,23 +6,11 @@
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (C) 2004 Dominik Brodowski <linux@brodo.de>
* Copyright (C) 2004 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
- * - Added processor hotplug support
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * - Added processor hotplug support
*/
+#define pr_fmt(fmt) "ACPI: " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
@@ -29,15 +18,12 @@
#include <linux/sched.h>
#include <linux/cpufreq.h>
#include <linux/acpi.h>
+#include <linux/uaccess.h>
#include <acpi/processor.h>
#include <asm/io.h>
-#include <linux/uaccess.h>
-
-#define PREFIX "ACPI: "
-
-#define ACPI_PROCESSOR_CLASS "processor"
-#define _COMPONENT ACPI_PROCESSOR_COMPONENT
-ACPI_MODULE_NAME("processor_throttling");
+#ifdef CONFIG_X86
+#include <asm/msr.h>
+#endif
/* ignore_tpc:
* 0 -> acpi processor driver doesn't ignore _TPC values
@@ -67,7 +53,7 @@ static int __acpi_processor_set_throttling(struct acpi_processor *pr,
static int acpi_processor_update_tsd_coord(void)
{
- int count, count_target;
+ int count_target;
int retval = 0;
unsigned int i, j;
cpumask_var_t covered_cpus;
@@ -124,7 +110,6 @@ static int acpi_processor_update_tsd_coord(void)
/* Validate the Domain info */
count_target = pdomain->num_processors;
- count = 1;
for_each_possible_cpu(j) {
if (i == j)
@@ -157,7 +142,6 @@ static int acpi_processor_update_tsd_coord(void)
cpumask_set_cpu(j, covered_cpus);
cpumask_set_cpu(j, pthrottling->shared_cpu_map);
- count++;
}
for_each_possible_cpu(j) {
if (i == j)
@@ -210,19 +194,15 @@ err_ret:
*/
void acpi_processor_throttling_init(void)
{
- if (acpi_processor_update_tsd_coord()) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Assume no T-state coordination\n"));
- }
-
- return;
+ if (acpi_processor_update_tsd_coord())
+ pr_debug("Assume no T-state coordination\n");
}
static int acpi_processor_throttling_notifier(unsigned long event, void *data)
{
struct throttling_tstate *p_tstate = data;
struct acpi_processor *pr;
- unsigned int cpu ;
+ unsigned int cpu;
int target_state;
struct acpi_processor_limit *p_limit;
struct acpi_processor_throttling *p_throttling;
@@ -230,12 +210,13 @@ static int acpi_processor_throttling_notifier(unsigned long event, void *data)
cpu = p_tstate->cpu;
pr = per_cpu(processors, cpu);
if (!pr) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n"));
+ pr_debug("Invalid pr pointer\n");
return 0;
}
if (!pr->flags.throttling) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is "
- "unsupported on CPU %d\n", cpu));
+ acpi_handle_debug(pr->handle,
+ "Throttling control unsupported on CPU %d\n",
+ cpu);
return 0;
}
target_state = p_tstate->target_state;
@@ -254,14 +235,13 @@ static int acpi_processor_throttling_notifier(unsigned long event, void *data)
if (pr->throttling_platform_limit > target_state)
target_state = pr->throttling_platform_limit;
if (target_state >= p_throttling->state_count) {
- printk(KERN_WARNING
- "Exceed the limit of T-state \n");
+ pr_warn("Exceed the limit of T-state\n");
target_state = p_throttling->state_count - 1;
}
p_tstate->target_state = target_state;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:"
- "target T-state of CPU %d is T%d\n",
- cpu, target_state));
+ acpi_handle_debug(pr->handle,
+ "PreChange Event: target T-state of CPU %d is T%d\n",
+ cpu, target_state);
break;
case THROTTLING_POSTCHANGE:
/*
@@ -269,13 +249,12 @@ static int acpi_processor_throttling_notifier(unsigned long event, void *data)
* T-state flag of acpi_processor_throttling.
*/
p_throttling->state = target_state;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:"
- "CPU %d is switched to T%d\n",
- cpu, target_state));
+ acpi_handle_debug(pr->handle,
+ "PostChange Event: CPU %d is switched to T%d\n",
+ cpu, target_state);
break;
default:
- printk(KERN_WARNING
- "Unsupported Throttling notifier event\n");
+ pr_warn("Unsupported Throttling notifier event\n");
break;
}
@@ -298,9 +277,9 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);
if (ACPI_FAILURE(status)) {
- if (status != AE_NOT_FOUND) {
- ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC"));
- }
+ if (status != AE_NOT_FOUND)
+ acpi_evaluation_failure_warn(pr->handle, "_TPC", status);
+
return -ENODEV;
}
@@ -426,21 +405,21 @@ static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
acpi_status status = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *ptc = NULL;
- union acpi_object obj = { 0 };
+ union acpi_object obj;
struct acpi_processor_throttling *throttling;
status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer);
if (ACPI_FAILURE(status)) {
- if (status != AE_NOT_FOUND) {
- ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC"));
- }
+ if (status != AE_NOT_FOUND)
+ acpi_evaluation_failure_warn(pr->handle, "_PTC", status);
+
return -ENODEV;
}
ptc = (union acpi_object *)buffer.pointer;
if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE)
|| (ptc->package.count != 2)) {
- printk(KERN_ERR PREFIX "Invalid _PTC data\n");
+ pr_err("Invalid _PTC data\n");
result = -EFAULT;
goto end;
}
@@ -454,8 +433,7 @@ static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
if ((obj.type != ACPI_TYPE_BUFFER)
|| (obj.buffer.length < sizeof(struct acpi_ptc_register))
|| (obj.buffer.pointer == NULL)) {
- printk(KERN_ERR PREFIX
- "Invalid _PTC data (control_register)\n");
+ pr_err("Invalid _PTC data (control_register)\n");
result = -EFAULT;
goto end;
}
@@ -471,7 +449,7 @@ static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
if ((obj.type != ACPI_TYPE_BUFFER)
|| (obj.buffer.length < sizeof(struct acpi_ptc_register))
|| (obj.buffer.pointer == NULL)) {
- printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n");
+ pr_err("Invalid _PTC data (status_register)\n");
result = -EFAULT;
goto end;
}
@@ -483,19 +461,19 @@ static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
if ((throttling->control_register.bit_width +
throttling->control_register.bit_offset) > 32) {
- printk(KERN_ERR PREFIX "Invalid _PTC control register\n");
+ pr_err("Invalid _PTC control register\n");
result = -EFAULT;
goto end;
}
if ((throttling->status_register.bit_width +
throttling->status_register.bit_offset) > 32) {
- printk(KERN_ERR PREFIX "Invalid _PTC status register\n");
+ pr_err("Invalid _PTC status register\n");
result = -EFAULT;
goto end;
}
- end:
+end:
kfree(buffer.pointer);
return result;
@@ -516,21 +494,21 @@ static int acpi_processor_get_throttling_states(struct acpi_processor *pr)
status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer);
if (ACPI_FAILURE(status)) {
- if (status != AE_NOT_FOUND) {
- ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS"));
- }
+ if (status != AE_NOT_FOUND)
+ acpi_evaluation_failure_warn(pr->handle, "_TSS", status);
+
return -ENODEV;
}
tss = buffer.pointer;
if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) {
- printk(KERN_ERR PREFIX "Invalid _TSS data\n");
+ pr_err("Invalid _TSS data\n");
result = -EFAULT;
goto end;
}
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
- tss->package.count));
+ acpi_handle_debug(pr->handle, "Found %d throttling states\n",
+ tss->package.count);
pr->throttling.state_count = tss->package.count;
pr->throttling.states_tss =
@@ -551,27 +529,27 @@ static int acpi_processor_get_throttling_states(struct acpi_processor *pr)
state.length = sizeof(struct acpi_processor_tx_tss);
state.pointer = tx;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
+ acpi_handle_debug(pr->handle, "Extracting state %d\n", i);
status = acpi_extract_package(&(tss->package.elements[i]),
&format, &state);
if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data"));
+ acpi_handle_warn(pr->handle, "Invalid _TSS data: %s\n",
+ acpi_format_exception(status));
result = -EFAULT;
kfree(pr->throttling.states_tss);
goto end;
}
if (!tx->freqpercentage) {
- printk(KERN_ERR PREFIX
- "Invalid _TSS data: freq is zero\n");
+ pr_err("Invalid _TSS data: freq is zero\n");
result = -EFAULT;
kfree(pr->throttling.states_tss);
goto end;
}
}
- end:
+end:
kfree(buffer.pointer);
return result;
@@ -596,21 +574,21 @@ static int acpi_processor_get_tsd(struct acpi_processor *pr)
status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer);
if (ACPI_FAILURE(status)) {
- if (status != AE_NOT_FOUND) {
- ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSD"));
- }
+ if (status != AE_NOT_FOUND)
+ acpi_evaluation_failure_warn(pr->handle, "_TSD", status);
+
return -ENODEV;
}
tsd = buffer.pointer;
if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) {
- printk(KERN_ERR PREFIX "Invalid _TSD data\n");
+ pr_err("Invalid _TSD data\n");
result = -EFAULT;
goto end;
}
if (tsd->package.count != 1) {
- printk(KERN_ERR PREFIX "Invalid _TSD data\n");
+ pr_err("Invalid _TSD data\n");
result = -EFAULT;
goto end;
}
@@ -623,19 +601,19 @@ static int acpi_processor_get_tsd(struct acpi_processor *pr)
status = acpi_extract_package(&(tsd->package.elements[0]),
&format, &state);
if (ACPI_FAILURE(status)) {
- printk(KERN_ERR PREFIX "Invalid _TSD data\n");
+ pr_err("Invalid _TSD data\n");
result = -EFAULT;
goto end;
}
if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) {
- printk(KERN_ERR PREFIX "Unknown _TSD:num_entries\n");
+ pr_err("Unknown _TSD:num_entries\n");
result = -EFAULT;
goto end;
}
if (pdomain->revision != ACPI_TSD_REV0_REVISION) {
- printk(KERN_ERR PREFIX "Unknown _TSD:revision\n");
+ pr_err("Unknown _TSD:revision\n");
result = -EFAULT;
goto end;
}
@@ -656,7 +634,7 @@ static int acpi_processor_get_tsd(struct acpi_processor *pr)
pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
}
- end:
+end:
kfree(buffer.pointer);
return result;
}
@@ -712,9 +690,9 @@ static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
local_irq_enable();
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ acpi_handle_debug(pr->handle,
"Throttling state is T%d (%d%% throttling applied)\n",
- state, pr->throttling.states[state].performance));
+ state, pr->throttling.states[state].performance);
return 0;
}
@@ -728,13 +706,12 @@ static int acpi_throttling_rdmsr(u64 *value)
if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
!this_cpu_has(X86_FEATURE_ACPI)) {
- printk(KERN_ERR PREFIX
- "HARDWARE addr space,NOT supported yet\n");
+ pr_err("HARDWARE addr space,NOT supported yet\n");
} else {
msr_low = 0;
msr_high = 0;
rdmsr_safe(MSR_IA32_THERM_CONTROL,
- (u32 *)&msr_low , (u32 *) &msr_high);
+ (u32 *)&msr_low, (u32 *) &msr_high);
msr = (msr_high << 32) | msr_low;
*value = (u64) msr;
ret = 0;
@@ -749,8 +726,7 @@ static int acpi_throttling_wrmsr(u64 value)
if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
!this_cpu_has(X86_FEATURE_ACPI)) {
- printk(KERN_ERR PREFIX
- "HARDWARE addr space,NOT supported yet\n");
+ pr_err("HARDWARE addr space,NOT supported yet\n");
} else {
msr = value;
wrmsr_safe(MSR_IA32_THERM_CONTROL,
@@ -762,15 +738,13 @@ static int acpi_throttling_wrmsr(u64 value)
#else
static int acpi_throttling_rdmsr(u64 *value)
{
- printk(KERN_ERR PREFIX
- "HARDWARE addr space,NOT supported yet\n");
+ pr_err("HARDWARE addr space,NOT supported yet\n");
return -1;
}
static int acpi_throttling_wrmsr(u64 value)
{
- printk(KERN_ERR PREFIX
- "HARDWARE addr space,NOT supported yet\n");
+ pr_err("HARDWARE addr space,NOT supported yet\n");
return -1;
}
#endif
@@ -801,7 +775,7 @@ static int acpi_read_throttling_status(struct acpi_processor *pr,
ret = acpi_throttling_rdmsr(value);
break;
default:
- printk(KERN_ERR PREFIX "Unknown addr space %d\n",
+ pr_err("Unknown addr space %d\n",
(u32) (throttling->status_register.space_id));
}
return ret;
@@ -834,7 +808,7 @@ static int acpi_write_throttling_state(struct acpi_processor *pr,
ret = acpi_throttling_wrmsr(value);
break;
default:
- printk(KERN_ERR PREFIX "Unknown addr space %d\n",
+ pr_err("Unknown addr space %d\n",
(u32) (throttling->control_register.space_id));
}
return ret;
@@ -889,8 +863,8 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
if (ret >= 0) {
state = acpi_get_throttling_state(pr, value);
if (state == -1) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Invalid throttling state, reset\n"));
+ acpi_handle_debug(pr->handle,
+ "Invalid throttling state, reset\n");
state = 0;
ret = __acpi_processor_set_throttling(pr, state, true,
true);
@@ -910,13 +884,6 @@ static long __acpi_processor_get_throttling(void *data)
return pr->throttling.acpi_processor_get_throttling(pr);
}
-static int call_on_cpu(int cpu, long (*fn)(void *), void *arg, bool direct)
-{
- if (direct || (is_percpu_thread() && cpu == smp_processor_id()))
- return fn(arg);
- return work_on_cpu(cpu, fn, arg);
-}
-
static int acpi_processor_get_throttling(struct acpi_processor *pr)
{
if (!pr)
@@ -942,15 +909,15 @@ static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
int i, step;
if (!pr->throttling.address) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
+ acpi_handle_debug(pr->handle, "No throttling register\n");
return -EINVAL;
} else if (!pr->throttling.duty_width) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
+ acpi_handle_debug(pr->handle, "No throttling states\n");
return -EINVAL;
}
/* TBD: Support duty_cycle values that span bit 4. */
else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) {
- printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n");
+ pr_warn("duty_cycle spans bit 4\n");
return -EINVAL;
}
@@ -1036,10 +1003,10 @@ static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
local_irq_enable();
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ acpi_handle_debug(pr->handle,
"Throttling state set to T%d (%d%%)\n", state,
(pr->throttling.states[state].performance ? pr->
- throttling.states[state].performance / 10 : 0)));
+ throttling.states[state].performance / 10 : 0));
return 0;
}
@@ -1150,8 +1117,8 @@ static int __acpi_processor_set_throttling(struct acpi_processor *pr,
* error message and continue.
*/
if (!match_pr) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Invalid Pointer for CPU %d\n", i));
+ acpi_handle_debug(pr->handle,
+ "Invalid Pointer for CPU %d\n", i);
continue;
}
/*
@@ -1159,9 +1126,8 @@ static int __acpi_processor_set_throttling(struct acpi_processor *pr,
* we will report the error message and continue.
*/
if (!match_pr->flags.throttling) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Throttling Control is unsupported "
- "on CPU %d\n", i));
+ acpi_handle_debug(pr->handle,
+ "Throttling Control unsupported on CPU %d\n", i);
continue;
}
@@ -1198,11 +1164,11 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
int result = 0;
struct acpi_processor_throttling *pthrottling;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ acpi_handle_debug(pr->handle,
"pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
pr->throttling.address,
pr->throttling.duty_offset,
- pr->throttling.duty_width));
+ pr->throttling.duty_width);
/*
* Evaluate _PTC, _TSS and _TPC
@@ -1210,8 +1176,7 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
*/
if (acpi_processor_get_throttling_control(pr) ||
acpi_processor_get_throttling_states(pr) ||
- acpi_processor_get_platform_limit(pr))
- {
+ acpi_processor_get_platform_limit(pr)) {
pr->throttling.acpi_processor_get_throttling =
&acpi_processor_get_throttling_fadt;
pr->throttling.acpi_processor_set_throttling =
@@ -1242,13 +1207,13 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
* used this part.
*/
if (errata.piix4.throttle) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "Throttling not supported on PIIX4 A- or B-step\n"));
+ acpi_handle_debug(pr->handle,
+ "Throttling not supported on PIIX4 A- or B-step\n");
return 0;
}
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
- pr->throttling.state_count));
+ acpi_handle_debug(pr->handle, "Found %d throttling states\n",
+ pr->throttling.state_count);
pr->flags.throttling = 1;
@@ -1263,15 +1228,15 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
goto end;
if (pr->throttling.state) {
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ acpi_handle_debug(pr->handle,
"Disabling throttling (was T%d)\n",
- pr->throttling.state));
+ pr->throttling.state);
result = acpi_processor_set_throttling(pr, 0, false);
if (result)
goto end;
}
- end:
+end:
if (result)
pr->flags.throttling = 0;
generated by cgit (git 2.34.1) at 2025-12-24 19:03:41 +0000