Re: [Intel-gfx] [PATCH 1/4] drm/i915/mtl: Define GSC Proxy component interface

[Jani Nikula <jani.nikula@linux.intel.com>]

On Tue, 18 Apr 2023, "Teres Alexis, Alan Previn" <alan.previn.teres.alexis@intel.com> wrote:
> On Wed, 2023-03-29 at 09:56 -0700, Ceraolo Spurio, Daniele wrote:
>> From: Alexander Usyskin <alexander.usyskin@intel.com>
>> 
>> GSC Proxy component is used for communication between the
>> Intel graphics driver and MEI driver.
>
>
>
>> diff --git a/include/drm/i915_gsc_proxy_mei_interface.h b/include/drm/i915_gsc_proxy_mei_interface.h
>> new file mode 100644
>> index 000000000000..e817bb316d5c
>> --- /dev/null
>> +++ b/include/drm/i915_gsc_proxy_mei_interface.h
>> @@ -0,0 +1,36 @@
>> +/* SPDX-License-Identifier: MIT */
>> +/*
>> + * Copyright (c) 2022-2023 Intel Corporation
>> + */
>> +
>> +#ifndef _I915_GSC_PROXY_MEI_INTERFACE_H_
>> +#define _I915_GSC_PROXY_MEI_INTERFACE_H_
>> +
>> +#include <linux/mutex.h>
>
> alan: i notice u have included mutex.h but don't have any mutex use in this header.
> side note: looking at at least one other component interfaces (pxp), I see a mutex in the
> component struct but don't see it being used at all - a topic for a different series.
>
>
>> +#include <linux/device.h>
> alan: any reason we should include "device.h"? as opposed to just define the ptr type
> (since w only reference the ptrs). this could save us a little on build time

The only thing required is <linux/types.h>. Everything else can be
forward declared.

BR,
Jani.

>
>> +
>> +/**
>> + * struct i915_gsc_proxy_component_ops - ops for GSC Proxy services.
>> + * @owner: Module providing the ops
>> + * @send: sends data through GSC proxy
>> + * @recv: receives data through GSC proxy
> alan: nit: to be more specific "... from i915 through GSC proxy"
>
>> + */
>> +struct i915_gsc_proxy_component_ops {
>> +	struct module *owner;
>> +
>> +	int (*send)(struct device *dev, const void *buf, size_t size);
>> +	int (*recv)(struct device *dev, void *buf, size_t size);
>> +};
> alan: i believe we should have proper documentation on the possible list of
> return values for the various error conditions (assuming 0 is success).
>
>> +
>> +/**
>> + * struct i915_gsc_proxy_component - Used for communication between i915 and
>> + * MEI drivers for GSC proxy services
>> + * @mei_dev: device that provide the GSC proxy service.
>> + * @ops: Ops implemented by GSC proxy driver, used by i915 driver.
>> + */
>> +struct i915_gsc_proxy_component {
>> +	struct device *mei_dev;
>> +	const struct i915_gsc_proxy_component_ops *ops;
>> +};
>> +
>> +#endif /* _I915_GSC_PROXY_MEI_INTERFACE_H_ */
>

-- 
Jani Nikula, Intel Open Source Graphics Center