linux-kernel - Re: [PATCH v4 01/10] coresight: syscfg: Initial coresight system configuration

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Date:   Thu, 4 Mar 2021 10:48:22 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     Mike Leach <mike.leach@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, coresight@...ts.linaro.org,
        mathieu.poirier@...aro.org, linux-doc@...r.kernel.org
Cc:     yabinc@...gle.com, corbet@....net, leo.yan@...aro.org,
        alexander.shishkin@...ux.intel.com, tingwei@...eaurora.org,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 01/10] coresight: syscfg: Initial coresight system
 configuration

On 1/28/21 5:09 PM, Mike Leach wrote:
> Creates an system management API to allow complex configurations and
> features to be programmed into a CoreSight infrastructure.
> 
> A feature is defined as a programming set for a device or class of
> devices.
> 
> A configuration is a set of features across the system that are enabled
> for a trace session.
> 
> The API will manage system wide configuration, and allow complex
> programmed features to be added to individual device instances, and
> provide for system wide configuration selection on trace capture
> operations.
> 
> This patch creates the initial data object and the initial API for
> loading configurations and features.
> 
> Signed-off-by: Mike Leach <mike.leach@...aro.org>


> +/**
> + * Representation of register value.
> + *
> + * Supports full 64 bit register value, or 32 bit value with optional mask
> + * value.
> + *
> + * @type:	define register usage and interpretation.
> + * @offset:	the address offset for register in the hardware device (per device specification).
> + * @hw_info:	optional hardware device type specific information. (ETM / CTI specific etc)
> + * @val64:	64 bit value.
> + * @val32:	32 bit value.
> + * @mask32:	32 bit mask when using 32 bit value to access device register.
> + */
> +struct cscfg_regval_desc {
> +	struct {
> +		u32 type:8;
> +		u32 offset:12;
> +		u32 hw_info:12;
> +	};
> +	union {
> +		u64 val64;
> +		struct {
> +			u32 val32;

Since this is also overloaded with param_idx for VAL_PARAM type, please
make this explicit by doing something like this, to avoid having
to explain things in the code, undocumented here.

			union {
				u32 val32;
				u32 param_idx;
			};


Cheers
Suzuki