linux-kernel - Re: [PATCH v2 01/34] media: introduce common helpers for video firmware handling

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Message-ID: <08013b9f-f259-459d-a5ce-269fb78ecf7a@quicinc.com>
Date: Wed, 20 Dec 2023 13:31:52 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Bryan O'Donoghue
	<bryan.odonoghue@...aro.org>
CC: <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>,
        <konrad.dybcio@...aro.org>, <mchehab@...nel.org>,
        <linux-arm-msm@...r.kernel.org>, <quic_abhinavk@...cinc.com>
Subject: Re: [PATCH v2 01/34] media: introduce common helpers for video
 firmware handling



On 12/19/2023 6:56 PM, Dmitry Baryshkov wrote:
> On Tue, 19 Dec 2023 at 13:40, Bryan O'Donoghue
> <bryan.odonoghue@...aro.org> wrote:
>>
>> On 18/12/2023 11:31, Dikshita Agarwal wrote:
>>> Re-organize the video driver code by introducing a new folder
>>> 'vcodec' and placing 'venus' driver code inside that.
>>>
>>> Introduce common helpers for trustzone based firmware
>>> load/unload etc. which are placed in common folder
>>> i.e. 'vcodec'.
>>> Use these helpers in 'venus' driver. These helpers will be
>>> used by 'iris' driver as well which is introduced later
>>> in this patch series.
>>>
>>> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
>>> ---
>>
>> This is a very large patch, I think it needs to be broken up into
>> smaller chunks.
>>
>> #1 Introduce common helper functions
>> #2 Use common helper functions
> 
> This will make it harder to review. It's usually preferred to have a
> single 'move' patch instead of two (add + remove). But I definitely
> agree that the size of the patch is big. Somewhat it is related to the
> fact that this doesn't only introduce helpers, but also reshuffles the
> rest of the code.
> 
Thanking along the same lines as Dmitry's, we wanted to show the usage of
these common helpers in iris driver as well, hence we added these patches
as part of this series.
I can send these patches 1-3 as separate series and mark the dependency of
iris series to that if you would prefer that way.

Also, as mentioned in comments in previous patches, to make the common
helper code generic, moving just the code from venus to vcodec was not
sufficient and more changes were needed in calling functions of venus as well.
>>
>> Its alot of code to try to eat in the one go.
>>
>> Could you consider making patches 1-3 a standalone series to reduce the
>> amount of code to review here ?
> 
> This sounds like a good idea.
> >>
>> * 77e7025529d7c - (HEAD -> linux-stable-master-23-12-18-iris-v2) media:
>> iris: add power management for encoder (21 hours ago)
>>
>> * ceb6a6f023fd3 - (tag: v6.7-rc6, linux-stable/master) Linux 6.7-rc6 (2
>> days ago)
>>
>> git diff ceb6a6f023fd3 | wc -l
>>
>> 21243
>>
>> Also I feel it wouild give more time for the changes to "digest" though
>> upstream users and to find any unintended bugs.
>>
>>> +int load_fw(struct device *dev, const char *fw_name, phys_addr_t *mem_phys,
>>> +         size_t *mem_size, u32 pas_id, bool use_tz)
>>> +{
>>> +     const struct firmware *firmware = NULL;
>>> +     struct reserved_mem *rmem;
>>> +     struct device_node *node;
>>> +     void *mem_virt = NULL;
>>> +     ssize_t fw_size = 0;
>>> +     int ret;
>>> +
>>> +     if (!IS_ENABLED(CONFIG_QCOM_MDT_LOADER) ||
>>> +         (use_tz && !qcom_scm_is_available()))
>>> +             return -EPROBE_DEFER;
>>> +
>>> +     if (!fw_name || !(*fw_name))
>>> +             return -EINVAL;
>>
>> The parameter check should come before the qcom_scm_is_available()
>>
>> No matter how many times you -EPROBE_DEFER -EINVAL is still -EINVAL.
>>
Sure, will check and do the needful.
>>> +
>>> +     *mem_phys = 0;
>>> +     *mem_size = 0;
>>
>> I don't think you need this, you don't appear to use these variables
>> before you assign them below.
>>
That's true, will fix.
>>
>>> +
>>> +     *mem_phys = rmem->base;
>>> +     *mem_size = rmem->size;
>>
>>> +
>>> +int auth_reset_fw(u32 pas_id)
>>> +{
>>> +     return qcom_scm_pas_auth_and_reset(pas_id);
>>> +}
>>> +
>>> +void unload_fw(u32 pas_id)
>>> +{
>>> +     qcom_scm_pas_shutdown(pas_id);
>>> +}
>>> +
>>
>> Do these wrapper functions add anything ? Some kind of validity check on
>> the pas_id otherwise I'm not sure these are justified.
>>
>>> +int set_hw_state(bool resume)
>>> +{
>>> +     return qcom_scm_set_remote_state(resume, 0);
>>> +}
Will check more on this and do required changes.
>>> diff --git a/drivers/media/platform/qcom/vcodec/firmware.h b/drivers/media/platform/qcom/vcodec/firmware.h
>>> new file mode 100644
>>> index 0000000..7d410a8
>>> --- /dev/null
>>
>> ---
>> bod
>>
>>
> 
>