Message-Id: <d4993c89-f24f-43dd-a9cf-ccd98fb21172@app.fastmail.com>
Date: Sun, 11 Aug 2024 22:33:03 +1200
From: "Luke Jones" <luke@...nes.dev>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: platform-driver-x86@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
 "Hans de Goede" <hdegoede@...hat.com>, corentin.chary@...il.com
Subject: Re: [PATCH v2 5/6] platform/x86: asus-armoury: add core count control

On Tue, 6 Aug 2024, at 10:32 PM, Ilpo Järvinen wrote:
> On Tue, 6 Aug 2024, Luke D. Jones wrote:
> 
> > Implement Intel core enablement under the asus-armoury module using the
> > fw_attributes class.
> > 
> > This allows users to enable or disable preformance or efficiency cores
> > depending on their requirements. After change a reboot is required.
> > 
> > Signed-off-by: Luke D. Jones <luke@...nes.dev>
> > ---
> >  drivers/platform/x86/asus-armoury.c        | 208 ++++++++++++++++++++-
> >  drivers/platform/x86/asus-armoury.h        |  29 +++
> >  include/linux/platform_data/x86/asus-wmi.h |   4 +
> >  3 files changed, 240 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/platform/x86/asus-armoury.c b/drivers/platform/x86/asus-armoury.c
> > index 412e75c652a4..592ebea35ad5 100644
> > --- a/drivers/platform/x86/asus-armoury.c
> > +++ b/drivers/platform/x86/asus-armoury.c
> > @@ -39,6 +39,18 @@
> >  #define ASUS_MINI_LED_2024_STRONG 0x01
> >  #define ASUS_MINI_LED_2024_OFF 0x02
> >  
> > +enum cpu_core_type {
> > + CPU_CORE_PERF = 0,
> > + CPU_CORE_POWER,
> > +};
> > +
> > +enum cpu_core_value {
> > + CPU_CORE_DEFAULT = 0,
> > + CPU_CORE_MIN,
> > + CPU_CORE_MAX,
> > + CPU_CORE_CURRENT,
> > +};
> > +
> >  /* Default limits for tunables available on ASUS ROG laptops */
> >  #define PPT_CPU_LIMIT_MIN 5
> >  #define PPT_CPU_LIMIT_MAX 150
> > @@ -84,6 +96,10 @@ struct rog_tunables {
> >  u32 dgpu_tgp_min;
> >  u32 dgpu_tgp_max;
> >  u32 dgpu_tgp;
> > +
> > + u32 min_perf_cores;
> > + u32 max_perf_cores;
> > + u32 max_power_cores;
> >  };
> >  
> >  static const struct class *fw_attr_class;
> > @@ -148,7 +164,9 @@ static struct kobj_attribute pending_reboot = __ATTR_RO(pending_reboot);
> >  static bool asus_bios_requires_reboot(struct kobj_attribute *attr)
> >  {
> >  return !strcmp(attr->attr.name, "gpu_mux_mode") ||
> > -        !strcmp(attr->attr.name, "panel_hd_mode");
> > + !strcmp(attr->attr.name, "cores_performance") ||
> > + !strcmp(attr->attr.name, "cores_efficiency") ||
> > + !strcmp(attr->attr.name, "panel_hd_mode");
> >  }
> >  
> >  /**
> > @@ -576,6 +594,191 @@ static ssize_t apu_mem_possible_values_show(struct kobject *kobj,
> >  }
> >  ATTR_GROUP_ENUM_CUSTOM(apu_mem, "apu_mem", "Set the available system memory for the APU to use");
> >  
> > +static int init_max_cpu_cores(void)
> > +{
> > + u32 cores;
> > + int err;
> > +
> > + asus_armoury.rog_tunables->min_perf_cores = 4;
> > + asus_armoury.rog_tunables->max_perf_cores = 4;
> > + asus_armoury.rog_tunables->max_power_cores = 8;
> > +
> > + err = asus_wmi_get_devstate_dsts(ASUS_WMI_DEVID_CORES_MAX, &cores);
> > + if (err)
> > + return err;
> > +
> > + cores &= ~ASUS_WMI_DSTS_PRESENCE_BIT;
> > + asus_armoury.rog_tunables->max_power_cores = (cores & 0xff00) >> 8;
> > + asus_armoury.rog_tunables->max_perf_cores = cores & 0xff;
> 
> Define names for the fields returned in 'cores' using GENMASK() and use 
> FIELD_GET() here to extract them.

Wasn't aware of this. Also had to look at this https://mazdermind.de/genmask/ as the documentation for these things is... lacking.

> > +
> > + return 0;
> > +}
> > +
> > +static ssize_t cores_value_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf,
> > + enum cpu_core_type core_type,
> > + enum cpu_core_value core_value)
> > +{
> > + u32 cores;
> > + int err;
> > +
> > + switch (core_value) {
> > + case CPU_CORE_DEFAULT:
> > + case CPU_CORE_MAX:
> > + if (core_type == CPU_CORE_PERF)
> > + return sysfs_emit(buf, "%d\n", asus_armoury.rog_tunables->max_perf_cores);
> 
> %u for u32, please check all %d, I won't mark the rest.

Got it. Sorry.

> 
> > + else
> > + return sysfs_emit(buf, "%d\n", asus_armoury.rog_tunables->max_power_cores);
> > + case CPU_CORE_MIN:
> > + if (core_type == CPU_CORE_PERF)
> > + return sysfs_emit(buf, "%d\n", asus_armoury.rog_tunables->min_perf_cores);
> > + else
> > + return sysfs_emit(buf, "%d\n", 0);
> > + default:
> > + break;
> 
> Misindented.

Ack

> 
> > + }
> > +
> > + err = asus_wmi_get_devstate_dsts(ASUS_WMI_DEVID_CORES, &cores);
> > + if (err)
> > + return err;
> > +
> > + cores &= ~ASUS_WMI_DSTS_PRESENCE_BIT;
> > + if (core_type == CPU_CORE_PERF)
> > + cores &= 0xff;
> > + else
> > + cores = (cores & 0xff00) >> 8;
> 
> Perhaps create a helper which takes two pointers for core types as this 
> code is similar to the one in init_max_cpu_cores().

Maybe. I'll try work something out.

> > + return sysfs_emit(buf, "%d\n", cores);
> > +}
> > +
> > +static ssize_t cores_current_value_store(struct kobject *kobj,
> > + struct kobj_attribute *attr, const char *buf,
> > + enum cpu_core_type core_type)
> > +{
> > + int result, err;
> > + u32 cores, currentv, min, max;
> > +
> > + result = kstrtou32(buf, 10, &cores);
> > + if (result)
> > + return result;
> > +
> > + if (core_type == CPU_CORE_PERF) {
> > + min = asus_armoury.rog_tunables->min_perf_cores;
> > + max = asus_armoury.rog_tunables->max_perf_cores;
> > + } else {
> > + min = 0;
> > + max = asus_armoury.rog_tunables->max_power_cores;
> > + }
> > + if (cores < min || cores > max)
> > + return -EINVAL;
> > +
> > + err = asus_wmi_get_devstate_dsts(ASUS_WMI_DEVID_CORES, &currentv);
> > + if (err)
> > + return err;
> > +
> > + if (core_type == CPU_CORE_PERF)
> > + cores |= (currentv & 0xff00);
> > + else
> > + cores |= currentv & 0xff;
> 
> Use normal pattern to alter a field:
> xx &= ~YY;
> xx |= FIELD_PREP(YY, cores);
> 
> Alternatively you could just recalculate it fully since you've cached the 
> values?
> 
> > +
> > + if (cores == currentv)
> > + return 0;
> > +
> > + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_CORES, cores, &result);
> > + if (err) {
> > + pr_warn("Failed to set CPU core count: %d\n", err);
> > + return err;
> > + }
> > +
> > + if (result > 1) {
> > + pr_warn("Failed to set CPU core count (result): 0x%x\n", result);
> > + return -EIO;
> > + }
> > +
> > + pr_info("CPU core count changed, reboot required\n");
> > + sysfs_notify(kobj, NULL, attr->attr.name);
> > + asus_set_reboot_and_signal_event();
> 
> What prevents two change requests racing with each other?

Ah.. That's why I added a mutex I never used.

Thnak you for your patience and reviews.

Cheers,
Luke.

> 
> -- 
> i.
> 
> > + return 0;
> > +}
> > +
> > +static ssize_t cores_performance_min_value_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf)
> > +{
> > + return cores_value_show(kobj, attr, buf, CPU_CORE_PERF, CPU_CORE_MIN);
> > +}
> > +
> > +static ssize_t cores_performance_max_value_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf)
> > +{
> > + return cores_value_show(kobj, attr, buf, CPU_CORE_PERF, CPU_CORE_MAX);
> > +}
> > +
> > +static ssize_t cores_performance_default_value_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf)
> > +{
> > + return cores_value_show(kobj, attr, buf, CPU_CORE_PERF, CPU_CORE_DEFAULT);
> > +}
> > +
> > +static ssize_t cores_performance_current_value_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf)
> > +{
> > + return cores_value_show(kobj, attr, buf, CPU_CORE_PERF, CPU_CORE_CURRENT);
> > +}
> > +
> > +static ssize_t cores_performance_current_value_store(struct kobject *kobj,
> > + struct kobj_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + int err;
> > +
> > + err = cores_current_value_store(kobj, attr, buf, CPU_CORE_PERF);
> > + if (err)
> > + return err;
> > +
> > + return count;
> > +}
> > +ATTR_GROUP_CORES_RW(cores_performance, "cores_performance",
> > + "Set the max available performance cores");
> > +
> > +static ssize_t cores_efficiency_min_value_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf)
> > +{
> > + return cores_value_show(kobj, attr, buf, CPU_CORE_POWER, CPU_CORE_MIN);
> > +}
> > +
> > +static ssize_t cores_efficiency_max_value_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf)
> > +{
> > + return cores_value_show(kobj, attr, buf, CPU_CORE_POWER, CPU_CORE_MAX);
> > +}
> > +
> > +static ssize_t cores_efficiency_default_value_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf)
> > +{
> > + return cores_value_show(kobj, attr, buf, CPU_CORE_POWER, CPU_CORE_DEFAULT);
> > +}
> > +
> > +static ssize_t cores_efficiency_current_value_show(struct kobject *kobj,
> > + struct kobj_attribute *attr, char *buf)
> > +{
> > + return cores_value_show(kobj, attr, buf, CPU_CORE_POWER, CPU_CORE_CURRENT);
> > +}
> > +
> > +static ssize_t cores_efficiency_current_value_store(struct kobject *kobj,
> > + struct kobj_attribute *attr,
> > + const char *buf, size_t count)
> > +{
> > + int err;
> > +
> > + err = cores_current_value_store(kobj, attr, buf, CPU_CORE_POWER);
> > + if (err)
> > + return err;
> > +
> > + return count;
> > +}
> > +ATTR_GROUP_CORES_RW(cores_efficiency, "cores_efficiency",
> > + "Set the max available efficiency cores");
> > +
> >  /* Simple attribute creation */
> >  ATTR_GROUP_ROG_TUNABLE(ppt_pl1_spl, "ppt_pl1_spl", ASUS_WMI_DEVID_PPT_PL1_SPL, cpu_default,
> >         cpu_min, cpu_max, 1, "Set the CPU slow package limit");
> > @@ -631,6 +834,8 @@ static const struct asus_attr_group armoury_attr_groups[] = {
> >  { &dgpu_base_tgp_attr_group, ASUS_WMI_DEVID_DGPU_BASE_TGP },
> >  { &dgpu_tgp_attr_group, ASUS_WMI_DEVID_DGPU_SET_TGP },
> >  { &apu_mem_attr_group, ASUS_WMI_DEVID_APU_MEM },
> > + { &cores_efficiency_attr_group, ASUS_WMI_DEVID_CORES_MAX },
> > + { &cores_performance_attr_group, ASUS_WMI_DEVID_CORES_MAX },
> >  
> >  { &charge_mode_attr_group, ASUS_WMI_DEVID_CHARGE_MODE },
> >  { &boot_sound_attr_group, ASUS_WMI_DEVID_BOOT_SOUND },
> > @@ -811,6 +1016,7 @@ static int __init asus_fw_init(void)
> >  return -ENOMEM;
> >  }
> >  init_rog_tunables(asus_armoury.rog_tunables);
> > + init_max_cpu_cores();
> >  
> >  err = asus_fw_attr_add();
> >  mutex_unlock(&asus_armoury.mutex);
> > diff --git a/drivers/platform/x86/asus-armoury.h b/drivers/platform/x86/asus-armoury.h
> > index 96d991383b8a..da585a180125 100644
> > --- a/drivers/platform/x86/asus-armoury.h
> > +++ b/drivers/platform/x86/asus-armoury.h
> > @@ -154,6 +154,35 @@ static ssize_t enum_type_show(struct kobject *kobj, struct kobj_attribute *attr,
> >  .name = _fsname, .attrs = _attrname##_attrs                                    \
> >  }
> >  
> > +/* CPU core attributes need a little different in setup */
> > +#define ATTR_GROUP_CORES_RW(_attrname, _fsname, _dispname) \
> > +__ATTR_SHOW_FMT(scalar_increment, _attrname, "%d\n", 1); \
> > +__ATTR_SHOW_FMT(display_name, _attrname, "%s\n", _dispname); \
> > +static struct kobj_attribute attr_##_attrname##_current_value = \
> > + __ASUS_ATTR_RW(_attrname, current_value); \
> > +static struct kobj_attribute attr_##_attrname##_default_value = \
> > + __ASUS_ATTR_RO(_attrname, default_value); \
> > +static struct kobj_attribute attr_##_attrname##_min_value = \
> > + __ASUS_ATTR_RO(_attrname, min_value); \
> > +static struct kobj_attribute attr_##_attrname##_max_value = \
> > + __ASUS_ATTR_RO(_attrname, max_value); \
> > +static struct kobj_attribute attr_##_attrname##_type = \
> > + __ASUS_ATTR_RO_AS(type, int_type_show); \
> > +static struct attribute *_attrname##_attrs[] = { \
> > + &attr_##_attrname##_current_value.attr, \
> > + &attr_##_attrname##_default_value.attr, \
> > + &attr_##_attrname##_min_value.attr, \
> > + &attr_##_attrname##_max_value.attr, \
> > + &attr_##_attrname##_scalar_increment.attr, \
> > + &attr_##_attrname##_display_name.attr, \
> > + &attr_##_attrname##_type.attr, \
> > + NULL \
> > +}; \
> > +static const struct attribute_group _attrname##_attr_group = { \
> > + .name = _fsname, \
> > + .attrs = _attrname##_attrs \
> > +}
> > +
> >  /*
> >   * ROG PPT attributes need a little different in setup as they
> >   * require rog_tunables members.
> > diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> > index 287206a03763..2e7509ab5be0 100644
> > --- a/include/linux/platform_data/x86/asus-wmi.h
> > +++ b/include/linux/platform_data/x86/asus-wmi.h
> > @@ -133,6 +133,10 @@
> >  /* dgpu on/off */
> >  #define ASUS_WMI_DEVID_DGPU 0x00090020
> >  
> > +/* Intel E-core and P-core configuration in a format 0x0[E]0[P] */
> > +#define ASUS_WMI_DEVID_CORES 0x001200D2
> > + /* Maximum Intel E-core and P-core availability */
> > +#define ASUS_WMI_DEVID_CORES_MAX 0x001200D3
> >  #define ASUS_WMI_DEVID_DGPU_BASE_TGP 0x00120099
> >  #define ASUS_WMI_DEVID_DGPU_SET_TGP 0x00120098
> >  #define ASUS_WMI_DEVID_APU_MEM 0x000600C1
> > 
> 

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