linux-kernel - Re: [PATCH v2 10/34] media: iris: add PIL functionality for video firmware

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Date: Mon, 18 Dec 2023 22:40:10 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Dikshita Agarwal <quic_dikshita@...cinc.com>,
 linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 stanimir.k.varbanov@...il.com, quic_vgarodia@...cinc.com, agross@...nel.org,
 andersson@...nel.org, mchehab@...nel.org, bryan.odonoghue@...aro.org
Cc: linux-arm-msm@...r.kernel.org, quic_abhinavk@...cinc.com
Subject: Re: [PATCH v2 10/34] media: iris: add PIL functionality for video
 firmware



On 12/18/23 12:32, Dikshita Agarwal wrote:
> Load/unload firmware in memory via mdt loader.
> Firmware loading is part of core initialization
> and unloading is part of core de-initialization.
> This also changes the core states accordingly.
> 
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> ---
[...]

> +
> +#include "iris_core.h"
> +#include "iris_helpers.h"
> +#include "iris_hfi.h"
> +#include "iris_state.h"
> +
> +static int iris_core_deinit_locked(struct iris_core *core)
I suppose you meant to call this something like _nolock, as
you're calling it with a lock around it

> +{
> +	int ret;
> +
> +	ret = check_core_lock(core);
> +	if (ret)
> +		return ret;
> +
> +	if (core->state == IRIS_CORE_DEINIT)
> +		return 0;
> +
> +	iris_hfi_core_deinit(core);
> +
> +	iris_change_core_state(core, IRIS_CORE_DEINIT);
You're casually ignoring the return value of the two
above funcs here :/

> +
> +	return ret;
> +}
> +
> +int iris_core_deinit(struct iris_core *core)
> +{
> +	int ret;
> +
> +	mutex_lock(&core->lock);
> +	ret = iris_core_deinit_locked(core);
> +	mutex_unlock(&core->lock);
> +
> +	return ret;
> +}
> +
> +int iris_core_init(struct iris_core *core)
> +{
> +	int ret = 0;
> +
> +	mutex_lock(&core->lock);
You may be interested in scoped mutexes

> +	if (core_in_valid_state(core)) {
> +		goto unlock;
> +	} else if (core->state == IRIS_CORE_ERROR) {
> +		ret = -EINVAL;
> +		goto unlock;
> +	}
> +
> +	if (iris_change_core_state(core, IRIS_CORE_INIT_WAIT)) {
> +		iris_change_core_state(core, IRIS_CORE_ERROR);
> +		ret = -EINVAL;
> +		goto unlock;
> +	}
> +
> +	ret = iris_hfi_core_init(core);
> +	if (ret) {
> +		iris_change_core_state(core, IRIS_CORE_ERROR);
> +		dev_err(core->dev, "%s: core init failed\n", __func__);
__func__ still seems overly verbose in my eyes

[...]

> +
> +int check_core_lock(struct iris_core *core)
> +{
> +	bool fatal = !mutex_is_locked(&core->lock);
> +
> +	WARN_ON(fatal);
> +
> +	return fatal ? -EINVAL : 0;
You can simply inline this:

if (WARN_ON(!mutex_is_locked(&core->lock))
	return -EINVAL;

[...]
> +#define CP_START           0
> +#define CP_SIZE            0x25800000
> +#define CP_NONPIXEL_START  0x01000000
> +#define CP_NONPIXEL_SIZE   0x24800000
> +
> +#define FW_NAME "vpu30_4v.mbn"
This doesn't scale, at all.

Konrad