[PATCH] drm/amdgpu: make amdgpu device attr_update() function more efficient

[Ma, Jun]

Reviewed-by: Ma Jun <majun at amd.com>

On 3/26/2024 5:02 PM, Yang Wang wrote:
> add a new enumeration type to identify device attribute node,
> this method is relatively more efficient compared with 'strcmp' in
> update_attr() function.
> 
> Signed-off-by: Yang Wang <kevinyang.wang at amd.com>
> ---
>  drivers/gpu/drm/amd/pm/amdgpu_pm.c     |  4 +--
>  drivers/gpu/drm/amd/pm/inc/amdgpu_pm.h | 41 ++++++++++++++++++++++++++
>  2 files changed, 43 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> index 85e935556d7d..04f53f2667fe 100644
> --- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> +++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c
> @@ -2226,16 +2226,16 @@ static int default_attr_update(struct amdgpu_device *adev, struct amdgpu_device_
>  			       uint32_t mask, enum amdgpu_device_attr_states *states)
>  {
>  	struct device_attribute *dev_attr = &attr->dev_attr;
> +	enum amdgpu_device_attr_type type = attr->type;
>  	uint32_t mp1_ver = amdgpu_ip_version(adev, MP1_HWIP, 0);
>  	uint32_t gc_ver = amdgpu_ip_version(adev, GC_HWIP, 0);
> -	const char *attr_name = dev_attr->attr.name;
>  
>  	if (!(attr->flags & mask)) {
>  		*states = ATTR_STATE_UNSUPPORTED;
>  		return 0;
>  	}
>  
> -#define DEVICE_ATTR_IS(_name)	(!strcmp(attr_name, #_name))
> +#define DEVICE_ATTR_IS(_name)		(type == device_attr_type__##_name)
>  
>  	if (DEVICE_ATTR_IS(pp_dpm_socclk)) {
>  		if (gc_ver < IP_VERSION(9, 0, 0))
> diff --git a/drivers/gpu/drm/amd/pm/inc/amdgpu_pm.h b/drivers/gpu/drm/amd/pm/inc/amdgpu_pm.h
> index eec816f0cbf9..157330c379be 100644
> --- a/drivers/gpu/drm/amd/pm/inc/amdgpu_pm.h
> +++ b/drivers/gpu/drm/amd/pm/inc/amdgpu_pm.h
> @@ -43,8 +43,48 @@ enum amdgpu_device_attr_states {
>  	ATTR_STATE_SUPPORTED,
>  };
>  
> +enum amdgpu_device_attr_type {
> +	device_attr_type__unknown = -1,
> +	device_attr_type__power_dpm_state = 0,
> +	device_attr_type__power_dpm_force_performance_level,
> +	device_attr_type__pp_num_states,
> +	device_attr_type__pp_cur_state,
> +	device_attr_type__pp_force_state,
> +	device_attr_type__pp_table,
> +	device_attr_type__pp_dpm_sclk,
> +	device_attr_type__pp_dpm_mclk,
> +	device_attr_type__pp_dpm_socclk,
> +	device_attr_type__pp_dpm_fclk,
> +	device_attr_type__pp_dpm_vclk,
> +	device_attr_type__pp_dpm_vclk1,
> +	device_attr_type__pp_dpm_dclk,
> +	device_attr_type__pp_dpm_dclk1,
> +	device_attr_type__pp_dpm_dcefclk,
> +	device_attr_type__pp_dpm_pcie,
> +	device_attr_type__pp_sclk_od,
> +	device_attr_type__pp_mclk_od,
> +	device_attr_type__pp_power_profile_mode,
> +	device_attr_type__pp_od_clk_voltage,
> +	device_attr_type__gpu_busy_percent,
> +	device_attr_type__mem_busy_percent,
> +	device_attr_type__vcn_busy_percent,
> +	device_attr_type__pcie_bw,
> +	device_attr_type__pp_features,
> +	device_attr_type__unique_id,
> +	device_attr_type__thermal_throttling_logging,
> +	device_attr_type__apu_thermal_cap,
> +	device_attr_type__gpu_metrics,
> +	device_attr_type__smartshift_apu_power,
> +	device_attr_type__smartshift_dgpu_power,
> +	device_attr_type__smartshift_bias,
> +	device_attr_type__xgmi_plpd_policy,
> +	device_attr_type__pm_metrics,
> +	device_attr_type__count,
> +};
> +
>  struct amdgpu_device_attr {
>  	struct device_attribute dev_attr;
> +	enum amdgpu_device_attr_type type;
>  	enum amdgpu_device_attr_flags flags;
>  	int (*attr_update)(struct amdgpu_device *adev, struct amdgpu_device_attr *attr,
>  			   uint32_t mask, enum amdgpu_device_attr_states *states);
> @@ -61,6 +101,7 @@ struct amdgpu_device_attr_entry {
>  
>  #define __AMDGPU_DEVICE_ATTR(_name, _mode, _show, _store, _flags, ...)	\
>  	{ .dev_attr = __ATTR(_name, _mode, _show, _store),		\
> +	  .type = device_attr_type__##_name,				\
>  	  .flags = _flags,						\
>  	  ##__VA_ARGS__, }
>