cpufreq: Remove unused APERF/MPERF support

The target frequency calculation method in the ondemand governor has
changed and it is now independent of the measured average frequency.
Consequently, the APERF/MPERF support in cpufreq is not used any
more, so drop it.

[rjw: Changelog]
Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 24cf5aefb7048b496082fd271755e3b186e23540..4f4a3d98c170477caff77d71693f203ae9a6fb34 100644 (file)
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -942,35 +942,6 @@ extern int set_tsc_mode(unsigned int val);
 
 extern u16 amd_get_nb_id(int cpu);
 
-struct aperfmperf {
-       u64 aperf, mperf;
-};
-
-static inline void get_aperfmperf(struct aperfmperf *am)
-{
-       WARN_ON_ONCE(!boot_cpu_has(X86_FEATURE_APERFMPERF));
-
-       rdmsrl(MSR_IA32_APERF, am->aperf);
-       rdmsrl(MSR_IA32_MPERF, am->mperf);
-}
-
-#define APERFMPERF_SHIFT 10
-
-static inline
-unsigned long calc_aperfmperf_ratio(struct aperfmperf *old,
-                                   struct aperfmperf *new)
-{
-       u64 aperf = new->aperf - old->aperf;
-       u64 mperf = new->mperf - old->mperf;
-       unsigned long ratio = aperf;
-
-       mperf >>= APERFMPERF_SHIFT;
-       if (mperf)
-               ratio = div64_u64(aperf, mperf);
-
-       return ratio;
-}
-
 extern unsigned long arch_align_stack(unsigned long sp);
 extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
 

diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index d345b5a7aa719e52fd660013afdf96b4d3da6335..ad5866c2ada0a5bd219305954682dbc7aae4f5a2 100644 (file)
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -23,7 +23,7 @@ obj-$(CONFIG_GENERIC_CPUFREQ_CPU0)    += cpufreq-cpu0.o
 # powernow-k8 can load then. ACPI is preferred to all other hardware-specific drivers.
 # speedstep-* is preferred over p4-clockmod.
 
-obj-$(CONFIG_X86_ACPI_CPUFREQ)         += acpi-cpufreq.o mperf.o
+obj-$(CONFIG_X86_ACPI_CPUFREQ)         += acpi-cpufreq.o
 obj-$(CONFIG_X86_POWERNOW_K8)          += powernow-k8.o
 obj-$(CONFIG_X86_PCC_CPUFREQ)          += pcc-cpufreq.o
 obj-$(CONFIG_X86_POWERNOW_K6)          += powernow-k6.o

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 39264020b88a1b2e7d461a8d0a3f2f909a31dbb4..e673670d2321fdbfe53349dafc4754d08ebcadc0 100644 (file)
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -45,7 +45,6 @@
 #include <asm/msr.h>
 #include <asm/processor.h>
 #include <asm/cpufeature.h>
-#include "mperf.h"
 
 MODULE_AUTHOR("Paul Diefenbaugh, Dominik Brodowski");
 MODULE_DESCRIPTION("ACPI Processor P-States Driver");
@@ -861,10 +860,6 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
        /* notify BIOS that we exist */
        acpi_processor_notify_smm(THIS_MODULE);
 
-       /* Check for APERF/MPERF support in hardware */
-       if (boot_cpu_has(X86_FEATURE_APERFMPERF))
-               acpi_cpufreq_driver.getavg = cpufreq_get_measured_perf;
-
        pr_debug("CPU%u - ACPI performance management activated.\n", cpu);
        for (i = 0; i < perf->state_count; i++)
                pr_debug("     %cP%d: %d MHz, %d mW, %d uS\n",

diff --git a/drivers/cpufreq/mperf.c b/drivers/cpufreq/mperf.c
deleted file mode 100644 (file)
index 911e193..0000000
--- a/drivers/cpufreq/mperf.c
+++ /dev/null
@@ -1,51 +0,0 @@
-#include <linux/kernel.h>
-#include <linux/smp.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/cpufreq.h>
-#include <linux/slab.h>
-
-#include "mperf.h"
-
-static DEFINE_PER_CPU(struct aperfmperf, acfreq_old_perf);
-
-/* Called via smp_call_function_single(), on the target CPU */
-static void read_measured_perf_ctrs(void *_cur)
-{
-       struct aperfmperf *am = _cur;
-
-       get_aperfmperf(am);
-}
-
-/*
- * Return the measured active (C0) frequency on this CPU since last call
- * to this function.
- * Input: cpu number
- * Return: Average CPU frequency in terms of max frequency (zero on error)
- *
- * We use IA32_MPERF and IA32_APERF MSRs to get the measured performance
- * over a period of time, while CPU is in C0 state.
- * IA32_MPERF counts at the rate of max advertised frequency
- * IA32_APERF counts at the rate of actual CPU frequency
- * Only IA32_APERF/IA32_MPERF ratio is architecturally defined and
- * no meaning should be associated with absolute values of these MSRs.
- */
-unsigned int cpufreq_get_measured_perf(struct cpufreq_policy *policy,
-                                       unsigned int cpu)
-{
-       struct aperfmperf perf;
-       unsigned long ratio;
-       unsigned int retval;
-
-       if (smp_call_function_single(cpu, read_measured_perf_ctrs, &perf, 1))
-               return 0;
-
-       ratio = calc_aperfmperf_ratio(&per_cpu(acfreq_old_perf, cpu), &perf);
-       per_cpu(acfreq_old_perf, cpu) = perf;
-
-       retval = (policy->cpuinfo.max_freq * ratio) >> APERFMPERF_SHIFT;
-
-       return retval;
-}
-EXPORT_SYMBOL_GPL(cpufreq_get_measured_perf);
-MODULE_LICENSE("GPL");

diff --git a/drivers/cpufreq/mperf.h b/drivers/cpufreq/mperf.h
deleted file mode 100644 (file)
index 5dbf295..0000000
--- a/drivers/cpufreq/mperf.h
+++ /dev/null
@@ -1,9 +0,0 @@
-/*
- *  (c) 2010 Advanced Micro Devices, Inc.
- *  Your use of this code is subject to the terms and conditions of the
- *  GNU general public license version 2. See "COPYING" or
- *  http://www.gnu.org/licenses/gpl.html
- */
-
-unsigned int cpufreq_get_measured_perf(struct cpufreq_policy *policy,
-                                       unsigned int cpu);