| Message ID | 1456441759-4877-1-git-send-email-srinivas.pandruvada@linux.intel.com (mailing list archive) |
|---|---|
| State | Accepted, archived |
| Delegated to: | Rafael Wysocki |
| Headers | show |
On Thursday, February 25, 2016 03:09:19 PM Srinivas Pandruvada wrote: > If the processor supports HWP, enable it by default without checking > for the cpu model. This will allow to enable HWP in all supported > processors without driver change. > > Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Isn't that a bit risky in the face of recent experience? Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, 2016-02-26 at 00:19 +0100, Rafael J. Wysocki wrote: > On Thursday, February 25, 2016 03:09:19 PM Srinivas Pandruvada wrote: > > If the processor supports HWP, enable it by default without > > checking > > for the cpu model. This will allow to enable HWP in all supported > > processors without driver change. > > > > Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel > > .com> > > Isn't that a bit risky in the face of recent experience? Good question. The current systems which are commercial, already have cpuid added in our list, so HWP will be enabled anyway. The one system we know there is an issue, hope we can debug before merge window start. If I don't do, I have to add few more ids to the list. Let's wait for few more weeks to review and merge this. I will let anybody from the community comment, who are using Skylake. Thanks, Srinivas > > Rafael > > -- > To unsubscribe from this list: send the line "unsubscribe linux-pm" > in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Thursday, February 25, 2016 03:33:51 PM Srinivas Pandruvada wrote: > On Fri, 2016-02-26 at 00:19 +0100, Rafael J. Wysocki wrote: > > On Thursday, February 25, 2016 03:09:19 PM Srinivas Pandruvada wrote: > > > If the processor supports HWP, enable it by default without > > > checking > > > for the cpu model. This will allow to enable HWP in all supported > > > processors without driver change. > > > > > > Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel > > > .com> > > > > Isn't that a bit risky in the face of recent experience? > Good question. The current systems which are commercial, already have > cpuid added in our list, so HWP will be enabled anyway. > The one system we know there is an issue, hope we can debug before > merge window start. > If I don't do, I have to add few more ids to the list. > > Let's wait for few more weeks to review and merge this. I will let > anybody from the community comment, who are using Skylake. I've queued up the patch for 4.6 to expose it a bit more. It may stay in linux-next for now and I can always drop it if need be. Thanks, Rafael -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 80ea548..0eca72a 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1374,6 +1374,11 @@ static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } static inline bool intel_pstate_has_acpi_ppc(void) { return false; } #endif /* CONFIG_ACPI */ +static const struct x86_cpu_id hwp_support_ids[] __initconst = { + { X86_VENDOR_INTEL, 6, X86_MODEL_ANY, X86_FEATURE_HWP }, + {} +}; + static int __init intel_pstate_init(void) { int cpu, rc = 0; @@ -1383,17 +1388,16 @@ static int __init intel_pstate_init(void) if (no_load) return -ENODEV; + if (x86_match_cpu(hwp_support_ids) && !no_hwp) { + copy_cpu_funcs(&core_params.funcs); + hwp_active++; + goto hwp_cpu_matched; + } + id = x86_match_cpu(intel_pstate_cpu_ids); if (!id) return -ENODEV; - /* - * The Intel pstate driver will be ignored if the platform - * firmware has its own power management modes. - */ - if (intel_pstate_platform_pwr_mgmt_exists()) - return -ENODEV; - cpu_def = (struct cpu_defaults *)id->driver_data; copy_pid_params(&cpu_def->pid_policy); @@ -1402,17 +1406,20 @@ static int __init intel_pstate_init(void) if (intel_pstate_msrs_not_valid()) return -ENODEV; +hwp_cpu_matched: + /* + * The Intel pstate driver will be ignored if the platform + * firmware has its own power management modes. + */ + if (intel_pstate_platform_pwr_mgmt_exists()) + return -ENODEV; + pr_info("Intel P-state driver initializing.\n"); all_cpu_data = vzalloc(sizeof(void *) * num_possible_cpus()); if (!all_cpu_data) return -ENOMEM; - if (static_cpu_has_safe(X86_FEATURE_HWP) && !no_hwp) { - pr_info("intel_pstate: HWP enabled\n"); - hwp_active++; - } - if (!hwp_active && hwp_only) goto out; @@ -1423,6 +1430,9 @@ static int __init intel_pstate_init(void) intel_pstate_debug_expose_params(); intel_pstate_sysfs_expose_params(); + if (hwp_active) + pr_info("intel_pstate: HWP enabled\n"); + return rc; out: get_online_cpus();
If the processor supports HWP, enable it by default without checking for the cpu model. This will allow to enable HWP in all supported processors without driver change. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> --- drivers/cpufreq/intel_pstate.c | 34 ++++++++++++++++++++++------------ 1 file changed, 22 insertions(+), 12 deletions(-)