Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...

[sfrench/cifs-2.6.git] / arch / x86 / kernel / cpu / cpufreq / acpi-cpufreq.c

diff --git a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
index 4b1c319d30c368592e990663fb1c8efd5abea963..19f6b9d27e83288fb516e59a490c6e08f55a9a64 100644 (file)
--- a/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
+++ b/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c
@@ -1,5 +1,5 @@
 /*
- * acpi-cpufreq.c - ACPI Processor P-States Driver ($Revision: 1.4 $)
+ * acpi-cpufreq.c - ACPI Processor P-States Driver
  *
  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
@@ -33,19 +33,21 @@
 #include <linux/cpufreq.h>
 #include <linux/compiler.h>
 #include <linux/dmi.h>
-#include <linux/ftrace.h>
+#include <trace/power.h>
 
 #include <linux/acpi.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+
 #include <acpi/processor.h>
 
-#include <asm/io.h>
 #include <asm/msr.h>
 #include <asm/processor.h>
 #include <asm/cpufeature.h>
-#include <asm/delay.h>
-#include <asm/uaccess.h>
 
-#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "acpi-cpufreq", msg)
+#define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, \
+               "acpi-cpufreq", msg)
 
 MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
 MODULE_DESCRIPTION("ACPI Processor P-States Driver");
@@ -70,6 +72,8 @@ struct acpi_cpufreq_data {
 
 static DEFINE_PER_CPU(struct acpi_cpufreq_data *, drv_data);
 
+DEFINE_TRACE(power_mark);
+
 /* acpi_perf_data is a pointer to percpu data. */
 static struct acpi_processor_performance *acpi_perf_data;
 
@@ -95,7 +99,7 @@ static unsigned extract_io(u32 value, struct acpi_cpufreq_data *data)
 
        perf = data->acpi_data;
 
-       for (i=0; i<perf->state_count; i++) {
+       for (i = 0; i < perf->state_count; i++) {
                if (value == perf->states[i].status)
                        return data->freq_table[i].frequency;
        }
@@ -110,7 +114,7 @@ static unsigned extract_msr(u32 msr, struct acpi_cpufreq_data *data)
        msr &= INTEL_MSR_RANGE;
        perf = data->acpi_data;
 
-       for (i=0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
+       for (i = 0; data->freq_table[i].frequency != CPUFREQ_TABLE_END; i++) {
                if (msr == perf->states[data->freq_table[i].index].status)
                        return data->freq_table[i].frequency;
        }
@@ -138,15 +142,13 @@ struct io_addr {
        u8 bit_width;
 };
 
-typedef union {
-       struct msr_addr msr;
-       struct io_addr io;
-} drv_addr_union;
-
 struct drv_cmd {
        unsigned int type;
        const struct cpumask *mask;
-       drv_addr_union addr;
+       union {
+               struct msr_addr msr;
+               struct io_addr io;
+       } addr;
        u32 val;
 };
 
@@ -369,7 +371,7 @@ static unsigned int check_freqs(const struct cpumask *mask, unsigned int freq,
        unsigned int cur_freq;
        unsigned int i;
 
-       for (i=0; i<100; i++) {
+       for (i = 0; i < 100; i++) {
                cur_freq = extract_freq(get_cur_val(mask), data);
                if (cur_freq == freq)
                        return 1;
@@ -494,7 +496,7 @@ acpi_cpufreq_guess_freq(struct acpi_cpufreq_data *data, unsigned int cpu)
                unsigned long freq;
                unsigned long freqn = perf->states[0].core_frequency * 1000;
 
-               for (i=0; i<(perf->state_count-1); i++) {
+               for (i = 0; i < (perf->state_count-1); i++) {
                        freq = freqn;
                        freqn = perf->states[i+1].core_frequency * 1000;
                        if ((2 * cpu_khz) > (freqn + freq)) {
@@ -601,7 +603,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
        if (!data)
                return -ENOMEM;
 
-       data->acpi_data = percpu_ptr(acpi_perf_data, cpu);
+       data->acpi_data = per_cpu_ptr(acpi_perf_data, cpu);
        per_cpu(drv_data, cpu) = data;
 
        if (cpu_has(c, X86_FEATURE_CONSTANT_TSC))
@@ -673,17 +675,29 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
 
        /* detect transition latency */
        policy->cpuinfo.transition_latency = 0;
-       for (i=0; i<perf->state_count; i++) {
+       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;
        }
 
+       /* Check for high latency (>20uS) from buggy BIOSes, like on T42 */
+       if (perf->control_register.space_id == ACPI_ADR_SPACE_FIXED_HARDWARE &&
+           policy->cpuinfo.transition_latency > 20 * 1000) {
+               static int print_once;
+               policy->cpuinfo.transition_latency = 20 * 1000;
+               if (!print_once) {
+                       print_once = 1;
+                       printk(KERN_INFO "Capping off P-state tranision latency"
+                               " at 20 uS\n");
+               }
+       }
+
        data->max_freq = perf->states[0].core_frequency * 1000;
        /* table init */
-       for (i=0; i<perf->state_count; i++) {
-               if (i>0 && perf->states[i].core_frequency >=
+       for (i = 0; i < perf->state_count; i++) {
+               if (i > 0 && perf->states[i].core_frequency >=
                    data->freq_table[valid_states-1].frequency / 1000)
                        continue;