Re: [PATCH 06/15] platform/x86/amd/pmf: Add support to get inputs from other subsystems

["Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>]

On Fri, 22 Sep 2023, Shyam Sundar S K wrote:

> PMF driver sends changing inputs from each subystem to TA for evaluating
> the conditions in the policy binary.
> 
> Add initial support of plumbing in the PMF driver for Smart PC to get
> information from other subsystems in the kernel.
> 
> Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> ---
>  drivers/platform/x86/amd/pmf/Makefile |   2 +-
>  drivers/platform/x86/amd/pmf/pmf.h    |  18 ++++
>  drivers/platform/x86/amd/pmf/spc.c    | 118 ++++++++++++++++++++++++++
>  drivers/platform/x86/amd/pmf/tee-if.c |   3 +
>  4 files changed, 140 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/platform/x86/amd/pmf/spc.c
> 
> diff --git a/drivers/platform/x86/amd/pmf/Makefile b/drivers/platform/x86/amd/pmf/Makefile
> index d2746ee7369f..6b26e48ce8ad 100644
> --- a/drivers/platform/x86/amd/pmf/Makefile
> +++ b/drivers/platform/x86/amd/pmf/Makefile
> @@ -7,4 +7,4 @@
>  obj-$(CONFIG_AMD_PMF) += amd-pmf.o
>  amd-pmf-objs := core.o acpi.o sps.o \
>  		auto-mode.o cnqf.o \
> -		tee-if.o
> +		tee-if.o spc.o
> diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h
> index 81acf2a37366..e64b4d285624 100644
> --- a/drivers/platform/x86/amd/pmf/pmf.h
> +++ b/drivers/platform/x86/amd/pmf/pmf.h
> @@ -146,6 +146,21 @@ struct smu_pmf_metrics {
>  	u16 infra_gfx_maxfreq; /* in MHz */
>  	u16 skin_temp; /* in centi-Celsius */
>  	u16 device_state;
> +	u16 curtemp; /* in centi-Celsius */
> +	u16 filter_alpha_value;
> +	u16 avg_gfx_clkfrequency;
> +	u16 avg_fclk_frequency;
> +	u16 avg_gfx_activity;
> +	u16 avg_socclk_frequency;
> +	u16 avg_vclk_frequency;
> +	u16 avg_vcn_activity;
> +	u16 avg_dram_reads;
> +	u16 avg_dram_writes;
> +	u16 avg_socket_power;
> +	u16 avg_core_power[2];
> +	u16 avg_core_c0residency[16];
> +	u16 spare1;
> +	u32 metrics_counter;
>  } __packed;
>  
>  enum amd_stt_skin_temp {
> @@ -592,4 +607,7 @@ extern const struct attribute_group cnqf_feature_attribute_group;
>  int amd_pmf_init_smart_pc(struct amd_pmf_dev *dev);
>  void amd_pmf_deinit_smart_pc(struct amd_pmf_dev *dev);
>  int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev);
> +
> +/* Smart PC - TA interfaces */
> +void amd_pmf_populate_ta_inputs(struct amd_pmf_dev *dev, struct ta_pmf_enact_table *in);
>  #endif /* PMF_H */
> diff --git a/drivers/platform/x86/amd/pmf/spc.c b/drivers/platform/x86/amd/pmf/spc.c
> new file mode 100644
> index 000000000000..08159cd5f853
> --- /dev/null
> +++ b/drivers/platform/x86/amd/pmf/spc.c
> @@ -0,0 +1,118 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * AMD Platform Management Framework Driver - Smart PC Capabilities
> + *
> + * Copyright (c) 2023, Advanced Micro Devices, Inc.
> + * All Rights Reserved.
> + *
> + * Authors: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
> + *          Patil Rajesh Reddy <Patil.Reddy@amd.com>
> + */
> +
> +#include <acpi/button.h>
> +#include <linux/power_supply.h>
> +#include "pmf.h"
> +
> +static void amd_pmf_get_smu_info(struct amd_pmf_dev *dev, struct ta_pmf_enact_table *in)
> +{
> +	u16 max, avg = 0;
> +	int i;
> +
> +	memset(dev->buf, 0, sizeof(dev->m_table));
> +	amd_pmf_send_cmd(dev, SET_TRANSFER_TABLE, 0, 7, NULL);
> +	memcpy(&dev->m_table, dev->buf, sizeof(dev->m_table));
> +
> +	in->ev_info.socket_power = dev->m_table.apu_power + dev->m_table.dgpu_power;
> +	in->ev_info.skin_temperature = dev->m_table.skin_temp;
> +
> +	/* get the avg C0 residency of all the cores */
> +	for (i = 0; i < ARRAY_SIZE(dev->m_table.avg_core_c0residency); i++)
> +		avg += dev->m_table.avg_core_c0residency[i];

Is this safe from overflow?

> +
> +	/* get the max C0 residency of all the cores */
> +	max = dev->m_table.avg_core_c0residency[0];
> +	for (i = 1; i < ARRAY_SIZE(dev->m_table.avg_core_c0residency); i++) {
> +		if (dev->m_table.avg_core_c0residency[i] > max)
> +			max = dev->m_table.avg_core_c0residency[i];
> +	}
> +
> +	in->ev_info.avg_c0residency = avg / ARRAY_SIZE(dev->m_table.avg_core_c0residency);
> +	in->ev_info.max_c0residency = max;
> +	in->ev_info.gfx_busy = dev->m_table.avg_gfx_activity;
> +}
> +
> +static const char * const pmf_battery_supply_name[] = {
> +	"BATT",
> +	"BAT0",
> +};
> +
> +static int get_battery_prop(enum power_supply_property prop)
> +{
> +	union power_supply_propval value;
> +	struct power_supply *psy;
> +	int i, ret = -EINVAL;
> +
> +	for (i = 0; i < ARRAY_SIZE(pmf_battery_supply_name); i++) {
> +		psy = power_supply_get_by_name(pmf_battery_supply_name[i]);
> +		if (!psy)
> +			continue;
> +
> +		ret = power_supply_get_property(psy, prop, &value);
> +		if (ret) {
> +			power_supply_put(psy);
> +			return ret;
> +		}
> +	}
> +
> +	return value.intval;
> +}
> +
> +static int amd_pmf_get_battery_info(struct amd_pmf_dev *dev, struct ta_pmf_enact_table *in)
> +{
> +	int val;
> +
> +	val = get_battery_prop(POWER_SUPPLY_PROP_PRESENT);
> +	if (val != 1)
> +		return -EINVAL;
> +
> +	in->ev_info.bat_percentage = get_battery_prop(POWER_SUPPLY_PROP_CAPACITY);
> +	/* all values in mWh metrics */
> +	in->ev_info.bat_design = get_battery_prop(POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN) / 1000;
> +	in->ev_info.full_charge_capacity = get_battery_prop(POWER_SUPPLY_PROP_ENERGY_FULL) / 1000;
> +	in->ev_info.drain_rate = get_battery_prop(POWER_SUPPLY_PROP_POWER_NOW) / 1000;

You don't need literal, use the defines provided in linux/units.h.

> +
> +	return 0;
> +}
> +
> +static int amd_pmf_get_slider_info(struct amd_pmf_dev *dev, struct ta_pmf_enact_table *in)
> +{
> +	int val;
> +
> +	switch (dev->current_profile) {
> +	case PLATFORM_PROFILE_PERFORMANCE:
> +		val = TA_BEST_PERFORMANCE;
> +		break;
> +	case PLATFORM_PROFILE_BALANCED:
> +		val = TA_BETTER_PERFORMANCE;
> +		break;
> +	case PLATFORM_PROFILE_LOW_POWER:
> +		val = TA_BEST_BATTERY;
> +		break;
> +	default:
> +		dev_err(dev->dev, "Unknown Platform Profile.\n");
> +		return -EOPNOTSUPP;
> +	}
> +	in->ev_info.power_slider = val;
> +
> +	return 0;
> +}
> +
> +void amd_pmf_populate_ta_inputs(struct amd_pmf_dev *dev, struct ta_pmf_enact_table *in)
> +{
> +	/* TA side lid open is 1 and close is 0, hence the ! here */
> +	in->ev_info.lid_state = !acpi_lid_open();
> +	in->ev_info.power_source = amd_pmf_get_power_source();
> +	amd_pmf_get_smu_info(dev, in);
> +	amd_pmf_get_battery_info(dev, in);
> +	amd_pmf_get_slider_info(dev, in);
> +}
> diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c
> index a8b05e746efd..eb25d5ce3a9a 100644
> --- a/drivers/platform/x86/amd/pmf/tee-if.c
> +++ b/drivers/platform/x86/amd/pmf/tee-if.c
> @@ -113,6 +113,7 @@ static int amd_pmf_invoke_cmd_enact(struct amd_pmf_dev *dev)
>  {
>  	struct ta_pmf_shared_memory *ta_sm = NULL;
>  	struct ta_pmf_enact_result *out = NULL;
> +	struct ta_pmf_enact_table *in = NULL;
>  	struct tee_param param[MAX_TEE_PARAM];
>  	struct tee_ioctl_invoke_arg arg;
>  	int ret = 0;
> @@ -123,11 +124,13 @@ static int amd_pmf_invoke_cmd_enact(struct amd_pmf_dev *dev)
>  	memset(dev->shbuf, 0, dev->policy_sz);
>  	ta_sm = (struct ta_pmf_shared_memory *)dev->shbuf;
>  	out = &ta_sm->pmf_output.policy_apply_table;
> +	in = &ta_sm->pmf_input.enact_table;
>  
>  	memset(ta_sm, 0, sizeof(struct ta_pmf_shared_memory));
>  	ta_sm->command_id = TA_PMF_COMMAND_POLICY_BUILDER__ENACT_POLICIES;
>  	ta_sm->if_version = PMF_TA_IF_VERSION__MAJOR;
>  
> +	amd_pmf_populate_ta_inputs(dev, in);
>  	amd_pmf_prepare_args(dev, TA_PMF_COMMAND_POLICY_BUILDER__ENACT_POLICIES, &arg, param);
>  
>  	ret = tee_client_invoke_func(dev->tee_ctx, &arg, param);
> 

-- 
 i.