linux-kernel - Re: [PATCH v2 06/18] media: venus: firmware: Leave a clue for homegrown porters

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Date:   Fri, 5 May 2023 21:24:12 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Vikash Garodia <quic_vgarodia@...cinc.com>,
        Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Dikshita Agarwal <dikshita@....qualcomm.com>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Mansur Alisha Shaik <mansur@...eaurora.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Dikshita Agarwal <quic_dikshita@...cinc.com>
Cc:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Marijn Suijten <marijn.suijten@...ainline.org>
Subject: Re: [PATCH v2 06/18] media: venus: firmware: Leave a clue for
 homegrown porters



On 5.05.2023 15:00, Vikash Garodia wrote:
> 
> On 5/5/2023 6:27 PM, Vikash Garodia wrote:
>>
>> On 5/4/2023 1:31 PM, Konrad Dybcio wrote:
>>> Leave a clue about where the seemingly magic values come from, as it
>>> is not obvious and requires some digging downstream..
> Rephrase the commit text.
Please be more specific, do you want me to use the
explanations you gave in the previous reply?

Konrad
>>> Reviewed-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> Reviewed-by: Vikash Garodia <quic_vgarodia@...cinc.com>
>>> ---
>>>   drivers/media/platform/qcom/venus/firmware.c | 7 +++++++
>>>   1 file changed, 7 insertions(+)
>>>
>>> diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
>>> index cfb11c551167..a4cd919e1dbe 100644
>>> --- a/drivers/media/platform/qcom/venus/firmware.c
>>> +++ b/drivers/media/platform/qcom/venus/firmware.c
>>> @@ -241,6 +241,13 @@ int venus_boot(struct venus_core *core)
>>>           return ret;
>>>         if (core->use_tz && res->cp_size) {
>>> +        /*
>>> +         * Clues for porting using downstream data:
>>> +         * cp_start = 0
>>> +         * cp_size = venus_ns/virtual-addr-pool[0] (yes, addr not size)
>>
>> The field is the start address of ns context bank. Since the cp_start is 0, the start address for (next) non-secure context bank
>>
>> is interpreted as size of the (previous) content protection region.
>>
>>> +         * cp_nonpixel_start = venus_sec_non_pixel/virtual-addr-pool[0]
>>> +         * cp_nonpixel_size = venus_sec_non_pixel/virtual-addr-pool[1]
>>> +         */
>>>           ret = qcom_scm_mem_protect_video_var(res->cp_start,
>>>                                res->cp_size,
>>>                                res->cp_nonpixel_start,
>>>