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Message-ID: <2707481.i2fpomAdZe@vostro.rjw.lan>
Date: Fri, 29 Nov 2013 14:55:43 +0100
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Viresh Kumar <viresh.kumar@...aro.org>
Cc: linaro-kernel@...ts.linaro.org, patches@...aro.org,
cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org, nm@...com, ceh@...com
Subject: Re: [PATCH V3 2/2] cpufreq: Mark x86 drivers with CPUFREQ_SKIP_INITIAL_FREQ_CHECK flag
On Friday, November 29, 2013 09:45:27 AM Viresh Kumar wrote:
> On some systems we can't really say what frequency we're running at the moment
> and so for these we shouldn't check if we are running at a frequency present in
> frequency table. For now mark all x86 drivers with this flag:
> CPUFREQ_SKIP_INITIAL_FREQ_CHECK.
>
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
> Rafael,
>
> Please check if I have missed any driver or added an extra one.
I think you haven't missed any of them.
That said, you need to do this in patch [1/2], or the kernel between
patches [1/2] and [2/2] may be broken on some systems.
If you want to do that in separate patches, the current [2/2] should be
[1/2] and vice versa.
I guess they will apply in the reverse order?
> drivers/cpufreq/acpi-cpufreq.c | 1 +
> drivers/cpufreq/cpufreq-nforce2.c | 1 +
> drivers/cpufreq/e_powersaver.c | 1 +
> drivers/cpufreq/elanfreq.c | 1 +
> drivers/cpufreq/gx-suspmod.c | 1 +
> drivers/cpufreq/ia64-acpi-cpufreq.c | 1 +
> drivers/cpufreq/intel_pstate.c | 2 +-
> drivers/cpufreq/longhaul.c | 1 +
> drivers/cpufreq/longrun.c | 2 +-
> drivers/cpufreq/p4-clockmod.c | 1 +
> drivers/cpufreq/pcc-cpufreq.c | 2 +-
> drivers/cpufreq/powernow-k6.c | 1 +
> drivers/cpufreq/powernow-k7.c | 1 +
> drivers/cpufreq/powernow-k8.c | 3 ++-
> drivers/cpufreq/sc520_freq.c | 1 +
> drivers/cpufreq/speedstep-centrino.c | 1 +
> drivers/cpufreq/speedstep-ich.c | 1 +
> drivers/cpufreq/speedstep-smi.c | 1 +
> 18 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
> index caf41eb..b8e4f79 100644
> --- a/drivers/cpufreq/acpi-cpufreq.c
> +++ b/drivers/cpufreq/acpi-cpufreq.c
> @@ -903,6 +903,7 @@ static struct freq_attr *acpi_cpufreq_attr[] = {
> };
>
> static struct cpufreq_driver acpi_cpufreq_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = acpi_cpufreq_target,
> .bios_limit = acpi_processor_get_bios_limit,
> diff --git a/drivers/cpufreq/cpufreq-nforce2.c b/drivers/cpufreq/cpufreq-nforce2.c
> index a05b876..b3222f6 100644
> --- a/drivers/cpufreq/cpufreq-nforce2.c
> +++ b/drivers/cpufreq/cpufreq-nforce2.c
> @@ -370,6 +370,7 @@ static int nforce2_cpu_exit(struct cpufreq_policy *policy)
> }
>
> static struct cpufreq_driver nforce2_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .name = "nforce2",
> .verify = nforce2_verify,
> .target = nforce2_target,
> diff --git a/drivers/cpufreq/e_powersaver.c b/drivers/cpufreq/e_powersaver.c
> index 9012b8b..0826bda 100644
> --- a/drivers/cpufreq/e_powersaver.c
> +++ b/drivers/cpufreq/e_powersaver.c
> @@ -389,6 +389,7 @@ static int eps_cpu_exit(struct cpufreq_policy *policy)
> }
>
> static struct cpufreq_driver eps_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = eps_target,
> .init = eps_cpu_init,
> diff --git a/drivers/cpufreq/elanfreq.c b/drivers/cpufreq/elanfreq.c
> index de08acf..426d14d 100644
> --- a/drivers/cpufreq/elanfreq.c
> +++ b/drivers/cpufreq/elanfreq.c
> @@ -194,6 +194,7 @@ __setup("elanfreq=", elanfreq_setup);
>
>
> static struct cpufreq_driver elanfreq_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .get = elanfreq_get_cpu_frequency,
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = elanfreq_target,
> diff --git a/drivers/cpufreq/gx-suspmod.c b/drivers/cpufreq/gx-suspmod.c
> index d83e826..7bfad48 100644
> --- a/drivers/cpufreq/gx-suspmod.c
> +++ b/drivers/cpufreq/gx-suspmod.c
> @@ -438,6 +438,7 @@ static int cpufreq_gx_cpu_init(struct cpufreq_policy *policy)
> * MediaGX/Geode GX initialize cpufreq driver
> */
> static struct cpufreq_driver gx_suspmod_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .get = gx_get_cpuspeed,
> .verify = cpufreq_gx_verify,
> .target = cpufreq_gx_target,
> diff --git a/drivers/cpufreq/ia64-acpi-cpufreq.c b/drivers/cpufreq/ia64-acpi-cpufreq.c
> index 53c6ac6..907bf9a 100644
> --- a/drivers/cpufreq/ia64-acpi-cpufreq.c
> +++ b/drivers/cpufreq/ia64-acpi-cpufreq.c
> @@ -344,6 +344,7 @@ acpi_cpufreq_cpu_exit (
>
>
> static struct cpufreq_driver acpi_cpufreq_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = acpi_cpufreq_target,
> .get = acpi_cpufreq_get,
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 5f1cbae..6c8f5d3 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -725,7 +725,7 @@ static int intel_pstate_cpu_init(struct cpufreq_policy *policy)
> }
>
> static struct cpufreq_driver intel_pstate_driver = {
> - .flags = CPUFREQ_CONST_LOOPS,
> + .flags = CPUFREQ_CONST_LOOPS | CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .verify = intel_pstate_verify_policy,
> .setpolicy = intel_pstate_set_policy,
> .get = intel_pstate_get,
> diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c
> index 45bafdd..16c0a37 100644
> --- a/drivers/cpufreq/longhaul.c
> +++ b/drivers/cpufreq/longhaul.c
> @@ -909,6 +909,7 @@ static int longhaul_cpu_init(struct cpufreq_policy *policy)
> }
>
> static struct cpufreq_driver longhaul_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = longhaul_target,
> .get = longhaul_get,
> diff --git a/drivers/cpufreq/longrun.c b/drivers/cpufreq/longrun.c
> index 074971b..b67d341 100644
> --- a/drivers/cpufreq/longrun.c
> +++ b/drivers/cpufreq/longrun.c
> @@ -278,7 +278,7 @@ static int longrun_cpu_init(struct cpufreq_policy *policy)
>
>
> static struct cpufreq_driver longrun_driver = {
> - .flags = CPUFREQ_CONST_LOOPS,
> + .flags = CPUFREQ_CONST_LOOPS | CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .verify = longrun_verify_policy,
> .setpolicy = longrun_set_policy,
> .get = longrun_get,
> diff --git a/drivers/cpufreq/p4-clockmod.c b/drivers/cpufreq/p4-clockmod.c
> index 3d1cba9..92b7e2b 100644
> --- a/drivers/cpufreq/p4-clockmod.c
> +++ b/drivers/cpufreq/p4-clockmod.c
> @@ -234,6 +234,7 @@ static unsigned int cpufreq_p4_get(unsigned int cpu)
> }
>
> static struct cpufreq_driver p4clockmod_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = cpufreq_p4_target,
> .init = cpufreq_p4_cpu_init,
> diff --git a/drivers/cpufreq/pcc-cpufreq.c b/drivers/cpufreq/pcc-cpufreq.c
> index e2b4f40..eafe4ca 100644
> --- a/drivers/cpufreq/pcc-cpufreq.c
> +++ b/drivers/cpufreq/pcc-cpufreq.c
> @@ -571,7 +571,7 @@ static int pcc_cpufreq_cpu_exit(struct cpufreq_policy *policy)
> }
>
> static struct cpufreq_driver pcc_cpufreq_driver = {
> - .flags = CPUFREQ_CONST_LOOPS,
> + .flags = CPUFREQ_CONST_LOOPS | CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .get = pcc_get_freq,
> .verify = pcc_cpufreq_verify,
> .target = pcc_cpufreq_target,
> diff --git a/drivers/cpufreq/powernow-k6.c b/drivers/cpufreq/powernow-k6.c
> index 643e795..fe60021 100644
> --- a/drivers/cpufreq/powernow-k6.c
> +++ b/drivers/cpufreq/powernow-k6.c
> @@ -150,6 +150,7 @@ static unsigned int powernow_k6_get(unsigned int cpu)
> }
>
> static struct cpufreq_driver powernow_k6_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = powernow_k6_target,
> .init = powernow_k6_cpu_init,
> diff --git a/drivers/cpufreq/powernow-k7.c b/drivers/cpufreq/powernow-k7.c
> index 946708a..4e67abc 100644
> --- a/drivers/cpufreq/powernow-k7.c
> +++ b/drivers/cpufreq/powernow-k7.c
> @@ -679,6 +679,7 @@ static int powernow_cpu_exit(struct cpufreq_policy *policy)
> }
>
> static struct cpufreq_driver powernow_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = powernow_target,
> .get = powernow_get,
> diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c
> index 0023c7d..ffe89ba 100644
> --- a/drivers/cpufreq/powernow-k8.c
> +++ b/drivers/cpufreq/powernow-k8.c
> @@ -1204,7 +1204,8 @@ out:
> }
>
> static struct cpufreq_driver cpufreq_amd64_driver = {
> - .flags = CPUFREQ_ASYNC_NOTIFICATION,
> + .flags = CPUFREQ_ASYNC_NOTIFICATION |
> + CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = powernowk8_target,
> .bios_limit = acpi_processor_get_bios_limit,
> diff --git a/drivers/cpufreq/sc520_freq.c b/drivers/cpufreq/sc520_freq.c
> index 6adb354..d6a1cf6 100644
> --- a/drivers/cpufreq/sc520_freq.c
> +++ b/drivers/cpufreq/sc520_freq.c
> @@ -89,6 +89,7 @@ static int sc520_freq_cpu_init(struct cpufreq_policy *policy)
>
>
> static struct cpufreq_driver sc520_freq_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .get = sc520_freq_get_cpu_frequency,
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = sc520_freq_target,
> diff --git a/drivers/cpufreq/speedstep-centrino.c b/drivers/cpufreq/speedstep-centrino.c
> index 4e1daca..887fd43 100644
> --- a/drivers/cpufreq/speedstep-centrino.c
> +++ b/drivers/cpufreq/speedstep-centrino.c
> @@ -505,6 +505,7 @@ out:
> }
>
> static struct cpufreq_driver centrino_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .name = "centrino", /* should be speedstep-centrino,
> but there's a 16 char limit */
> .init = centrino_cpu_init,
> diff --git a/drivers/cpufreq/speedstep-ich.c b/drivers/cpufreq/speedstep-ich.c
> index 7639b2b..67596e7 100644
> --- a/drivers/cpufreq/speedstep-ich.c
> +++ b/drivers/cpufreq/speedstep-ich.c
> @@ -307,6 +307,7 @@ static int speedstep_cpu_init(struct cpufreq_policy *policy)
>
>
> static struct cpufreq_driver speedstep_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .name = "speedstep-ich",
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = speedstep_target,
> diff --git a/drivers/cpufreq/speedstep-smi.c b/drivers/cpufreq/speedstep-smi.c
> index 0f5326d..4f23289 100644
> --- a/drivers/cpufreq/speedstep-smi.c
> +++ b/drivers/cpufreq/speedstep-smi.c
> @@ -308,6 +308,7 @@ static int speedstep_resume(struct cpufreq_policy *policy)
> }
>
> static struct cpufreq_driver speedstep_driver = {
> + .flags = CPUFREQ_SKIP_INITIAL_FREQ_CHECK,
> .name = "speedstep-smi",
> .verify = cpufreq_generic_frequency_table_verify,
> .target_index = speedstep_target,
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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