| Message ID | 31afd5ae23f8b1d7c6a2f0efe593a368dee61224.1711335714.git.perry.yuan@amd.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | AMD Pstate Fixes And Enhancements | expand |
On Mon, Mar 25, 2024 at 11:03:28AM +0800, Yuan, Perry wrote: > Add quirks table to get CPPC capabilities issue fixed by providing > correct perf or frequency values while driver loading. > > If CPPC capabilities are not defined in the ACPI tables or wrongly > defined by platform firmware, it needs to use quick to get those > issues fixed with correct workaround values to make pstate driver > can be loaded even though there are CPPC capabilities errors. > > The workaround will match the broken BIOS which lack of CPPC capabilities > nominal_freq and lowest_freq definition in the ACPI table. > > $ cat /sys/devices/system/cpu/cpu0/acpi_cppc/lowest_freq > 0 > $ cat /sys/devices/system/cpu/cpu0/acpi_cppc/nominal_freq > 0 > > Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> > Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > Tested-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> > Signed-off-by: Perry Yuan <perry.yuan@amd.com> > --- > drivers/cpufreq/amd-pstate.c | 53 ++++++++++++++++++++++++++++++++++-- > include/linux/amd-pstate.h | 6 ++++ > 2 files changed, 57 insertions(+), 2 deletions(-) > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > index ec049b62b366..59a2db225d98 100644 > --- a/drivers/cpufreq/amd-pstate.c > +++ b/drivers/cpufreq/amd-pstate.c > @@ -67,6 +67,7 @@ static struct cpufreq_driver amd_pstate_epp_driver; > static int cppc_state = AMD_PSTATE_UNDEFINED; > static bool cppc_enabled; > static bool amd_pstate_prefcore = true; > +static struct quirk_entry *quirks; If we set quirks as global pointer, while the amd-pstate is uninstalling, should we free the quirks as well? Thanks, Ray > > /* > * AMD Energy Preference Performance (EPP) > @@ -111,6 +112,41 @@ static unsigned int epp_values[] = { > > typedef int (*cppc_mode_transition_fn)(int); > > +static struct quirk_entry quirk_amd_7k62 = { > + .nominal_freq = 2600, > + .lowest_freq = 550, > +}; > + > +static int __init dmi_matched_7k62_bios_bug(const struct dmi_system_id *dmi) > +{ > + /** > + * match the broken bios for family 17h processor support CPPC V2 > + * broken BIOS lack of nominal_freq and lowest_freq capabilities > + * definition in ACPI tables > + */ > + if (boot_cpu_has(X86_FEATURE_ZEN2)) { > + quirks = dmi->driver_data; > + pr_info("Overriding nominal and lowest frequencies for %s\n", dmi->ident); > + return 1; > + } > + > + return 0; > +} > + > +static const struct dmi_system_id amd_pstate_quirks_table[] __initconst = { > + { > + .callback = dmi_matched_7k62_bios_bug, > + .ident = "AMD EPYC 7K62", > + .matches = { > + DMI_MATCH(DMI_BIOS_VERSION, "5.14"), > + DMI_MATCH(DMI_BIOS_RELEASE, "12/12/2019"), > + }, > + .driver_data = &quirk_amd_7k62, > + }, > + {} > +}; > +MODULE_DEVICE_TABLE(dmi, amd_pstate_quirks_table); > + > static inline int get_mode_idx_from_str(const char *str, size_t size) > { > int i; > @@ -812,8 +848,16 @@ static int amd_pstate_init_freq(struct amd_cpudata *cpudata) > if (ret) > return ret; > > - min_freq = cppc_perf.lowest_freq * 1000; > - nominal_freq = cppc_perf.nominal_freq * 1000; > + if (quirks && quirks->lowest_freq) > + min_freq = quirks->lowest_freq * 1000; > + else > + min_freq = cppc_perf.lowest_freq * 1000; > + > + if (quirks && quirks->nominal_freq) > + nominal_freq = quirks->nominal_freq * 1000; > + else > + nominal_freq = cppc_perf.nominal_freq * 1000; > + > nominal_perf = READ_ONCE(cpudata->nominal_perf); > > highest_perf = READ_ONCE(cpudata->highest_perf); > @@ -1662,6 +1706,11 @@ static int __init amd_pstate_init(void) > if (cpufreq_get_current_driver()) > return -EEXIST; > > + quirks = NULL; > + > + /* check if this machine need CPPC quirks */ > + dmi_check_system(amd_pstate_quirks_table); > + > switch (cppc_state) { > case AMD_PSTATE_UNDEFINED: > /* Disable on the following configs by default: > diff --git a/include/linux/amd-pstate.h b/include/linux/amd-pstate.h > index ab7e82533718..6b832153a126 100644 > --- a/include/linux/amd-pstate.h > +++ b/include/linux/amd-pstate.h > @@ -128,4 +128,10 @@ static const char * const amd_pstate_mode_string[] = { > [AMD_PSTATE_GUIDED] = "guided", > NULL, > }; > + > +struct quirk_entry { > + u32 nominal_freq; > + u32 lowest_freq; > +}; > + > #endif /* _LINUX_AMD_PSTATE_H */ > -- > 2.34.1 >
[AMD Official Use Only - General] Hi Ray, > -----Original Message----- > From: Huang, Ray <Ray.Huang@amd.com> > Sent: Monday, April 15, 2024 11:16 PM > To: Yuan, Perry <Perry.Yuan@amd.com> > Cc: rafael.j.wysocki@intel.com; Limonciello, Mario > <Mario.Limonciello@amd.com>; viresh.kumar@linaro.org; Shenoy, Gautham > Ranjal <gautham.shenoy@amd.com>; Petkov, Borislav > <Borislav.Petkov@amd.com>; Deucher, Alexander > <Alexander.Deucher@amd.com>; Huang, Shimmer <Shimmer.Huang@amd.com>; > oleksandr@natalenko.name; Du, Xiaojian <Xiaojian.Du@amd.com>; Meng, Li > (Jassmine) <Li.Meng@amd.com>; linux-pm@vger.kernel.org; linux- > kernel@vger.kernel.org > Subject: Re: [PATCH v10 8/8] cpufreq: amd-pstate: Add quirk for the pstate CPPC > capabilities missing > > On Mon, Mar 25, 2024 at 11:03:28AM +0800, Yuan, Perry wrote: > > Add quirks table to get CPPC capabilities issue fixed by providing > > correct perf or frequency values while driver loading. > > > > If CPPC capabilities are not defined in the ACPI tables or wrongly > > defined by platform firmware, it needs to use quick to get those > > issues fixed with correct workaround values to make pstate driver can > > be loaded even though there are CPPC capabilities errors. > > > > The workaround will match the broken BIOS which lack of CPPC > > capabilities nominal_freq and lowest_freq definition in the ACPI table. > > > > $ cat /sys/devices/system/cpu/cpu0/acpi_cppc/lowest_freq > > 0 > > $ cat /sys/devices/system/cpu/cpu0/acpi_cppc/nominal_freq > > 0 > > > > Reviewed-by: Mario Limonciello <mario.limonciello@amd.com> > > Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com> > > Tested-by: Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com> > > Signed-off-by: Perry Yuan <perry.yuan@amd.com> > > --- > > drivers/cpufreq/amd-pstate.c | 53 ++++++++++++++++++++++++++++++++++-- > > include/linux/amd-pstate.h | 6 ++++ > > 2 files changed, 57 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/cpufreq/amd-pstate.c > > b/drivers/cpufreq/amd-pstate.c index ec049b62b366..59a2db225d98 100644 > > --- a/drivers/cpufreq/amd-pstate.c > > +++ b/drivers/cpufreq/amd-pstate.c > > @@ -67,6 +67,7 @@ static struct cpufreq_driver amd_pstate_epp_driver; > > static int cppc_state = AMD_PSTATE_UNDEFINED; static bool > > cppc_enabled; static bool amd_pstate_prefcore = true; > > +static struct quirk_entry *quirks; > > If we set quirks as global pointer, while the amd-pstate is uninstalling, should we > free the quirks as well? > > Thanks, > Ray In general, if the `quirks` variable is dynamically allocated during the driver's execution, it should be freed during the driver's uninstallation to avoid memory leaks. If it is a static or constant variable, it does not need to be explicitly freed. In this patch, quirks is used to store the pointer to "dmi->driver_data", I will add your ack flag for this patch if you have no concern for this. + quirks = dmi->driver_data; Perry. > > > > > /* > > * AMD Energy Preference Performance (EPP) @@ -111,6 +112,41 @@ > > static unsigned int epp_values[] = { > > > > typedef int (*cppc_mode_transition_fn)(int); > > > > +static struct quirk_entry quirk_amd_7k62 = { > > + .nominal_freq = 2600, > > + .lowest_freq = 550, > > +}; > > + > > +static int __init dmi_matched_7k62_bios_bug(const struct > > +dmi_system_id *dmi) { > > + /** > > + * match the broken bios for family 17h processor support CPPC V2 > > + * broken BIOS lack of nominal_freq and lowest_freq capabilities > > + * definition in ACPI tables > > + */ > > + if (boot_cpu_has(X86_FEATURE_ZEN2)) { > > + quirks = dmi->driver_data; > > + pr_info("Overriding nominal and lowest frequencies for %s\n", > dmi->ident); > > + return 1; > > + } > > + > > + return 0; > > +} > > + > > +static const struct dmi_system_id amd_pstate_quirks_table[] __initconst = { > > + { > > + .callback = dmi_matched_7k62_bios_bug, > > + .ident = "AMD EPYC 7K62", > > + .matches = { > > + DMI_MATCH(DMI_BIOS_VERSION, "5.14"), > > + DMI_MATCH(DMI_BIOS_RELEASE, "12/12/2019"), > > + }, > > + .driver_data = &quirk_amd_7k62, > > + }, > > + {} > > +}; > > +MODULE_DEVICE_TABLE(dmi, amd_pstate_quirks_table); > > + > > static inline int get_mode_idx_from_str(const char *str, size_t size) > > { > > int i; > > @@ -812,8 +848,16 @@ static int amd_pstate_init_freq(struct amd_cpudata > *cpudata) > > if (ret) > > return ret; > > > > - min_freq = cppc_perf.lowest_freq * 1000; > > - nominal_freq = cppc_perf.nominal_freq * 1000; > > + if (quirks && quirks->lowest_freq) > > + min_freq = quirks->lowest_freq * 1000; > > + else > > + min_freq = cppc_perf.lowest_freq * 1000; > > + > > + if (quirks && quirks->nominal_freq) > > + nominal_freq = quirks->nominal_freq * 1000; > > + else > > + nominal_freq = cppc_perf.nominal_freq * 1000; > > + > > nominal_perf = READ_ONCE(cpudata->nominal_perf); > > > > highest_perf = READ_ONCE(cpudata->highest_perf); @@ -1662,6 > +1706,11 > > @@ static int __init amd_pstate_init(void) > > if (cpufreq_get_current_driver()) > > return -EEXIST; > > > > + quirks = NULL; > > + > > + /* check if this machine need CPPC quirks */ > > + dmi_check_system(amd_pstate_quirks_table); > > + > > switch (cppc_state) { > > case AMD_PSTATE_UNDEFINED: > > /* Disable on the following configs by default: > > diff --git a/include/linux/amd-pstate.h b/include/linux/amd-pstate.h > > index ab7e82533718..6b832153a126 100644 > > --- a/include/linux/amd-pstate.h > > +++ b/include/linux/amd-pstate.h > > @@ -128,4 +128,10 @@ static const char * const amd_pstate_mode_string[] = > { > > [AMD_PSTATE_GUIDED] = "guided", > > NULL, > > }; > > + > > +struct quirk_entry { > > + u32 nominal_freq; > > + u32 lowest_freq; > > +}; > > + > > #endif /* _LINUX_AMD_PSTATE_H */ > > -- > > 2.34.1 > >
diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index ec049b62b366..59a2db225d98 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -67,6 +67,7 @@ static struct cpufreq_driver amd_pstate_epp_driver; static int cppc_state = AMD_PSTATE_UNDEFINED; static bool cppc_enabled; static bool amd_pstate_prefcore = true; +static struct quirk_entry *quirks; /* * AMD Energy Preference Performance (EPP) @@ -111,6 +112,41 @@ static unsigned int epp_values[] = { typedef int (*cppc_mode_transition_fn)(int); +static struct quirk_entry quirk_amd_7k62 = { + .nominal_freq = 2600, + .lowest_freq = 550, +}; + +static int __init dmi_matched_7k62_bios_bug(const struct dmi_system_id *dmi) +{ + /** + * match the broken bios for family 17h processor support CPPC V2 + * broken BIOS lack of nominal_freq and lowest_freq capabilities + * definition in ACPI tables + */ + if (boot_cpu_has(X86_FEATURE_ZEN2)) { + quirks = dmi->driver_data; + pr_info("Overriding nominal and lowest frequencies for %s\n", dmi->ident); + return 1; + } + + return 0; +} + +static const struct dmi_system_id amd_pstate_quirks_table[] __initconst = { + { + .callback = dmi_matched_7k62_bios_bug, + .ident = "AMD EPYC 7K62", + .matches = { + DMI_MATCH(DMI_BIOS_VERSION, "5.14"), + DMI_MATCH(DMI_BIOS_RELEASE, "12/12/2019"), + }, + .driver_data = &quirk_amd_7k62, + }, + {} +}; +MODULE_DEVICE_TABLE(dmi, amd_pstate_quirks_table); + static inline int get_mode_idx_from_str(const char *str, size_t size) { int i; @@ -812,8 +848,16 @@ static int amd_pstate_init_freq(struct amd_cpudata *cpudata) if (ret) return ret; - min_freq = cppc_perf.lowest_freq * 1000; - nominal_freq = cppc_perf.nominal_freq * 1000; + if (quirks && quirks->lowest_freq) + min_freq = quirks->lowest_freq * 1000; + else + min_freq = cppc_perf.lowest_freq * 1000; + + if (quirks && quirks->nominal_freq) + nominal_freq = quirks->nominal_freq * 1000; + else + nominal_freq = cppc_perf.nominal_freq * 1000; + nominal_perf = READ_ONCE(cpudata->nominal_perf); highest_perf = READ_ONCE(cpudata->highest_perf); @@ -1662,6 +1706,11 @@ static int __init amd_pstate_init(void) if (cpufreq_get_current_driver()) return -EEXIST; + quirks = NULL; + + /* check if this machine need CPPC quirks */ + dmi_check_system(amd_pstate_quirks_table); + switch (cppc_state) { case AMD_PSTATE_UNDEFINED: /* Disable on the following configs by default: diff --git a/include/linux/amd-pstate.h b/include/linux/amd-pstate.h index ab7e82533718..6b832153a126 100644 --- a/include/linux/amd-pstate.h +++ b/include/linux/amd-pstate.h @@ -128,4 +128,10 @@ static const char * const amd_pstate_mode_string[] = { [AMD_PSTATE_GUIDED] = "guided", NULL, }; + +struct quirk_entry { + u32 nominal_freq; + u32 lowest_freq; +}; + #endif /* _LINUX_AMD_PSTATE_H */