Date:   Mon, 22 May 2017 18:56:03 +0530
From:   "Dwivedi, Avaneesh Kumar (avani)" <akdwived@...eaurora.org>
To:     Sricharan R <sricharan@...eaurora.org>, bjorn.andersson@...aro.org
Cc:     sboyd@...eaurora.org, agross@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-remoteproc@...r.kernel.org
Subject: Re: [RESEND: PATCH v4 2/4] remoteproc: qcom: refactor mss fw image
 loading sequence



On 5/22/2017 4:07 PM, Sricharan R wrote:
> Hi,
>
> On 5/22/2017 3:03 PM, Dwivedi, Avaneesh Kumar (avani) wrote:
>>
>> On 5/20/2017 8:25 AM, Sricharan R wrote:
>>> Hi Bjorn/Avaneesh,
>>>
>>> On 5/16/2017 11:32 PM, Avaneesh Kumar Dwivedi wrote:
>>>> This patch refactor code to first load all firmware blobs
>>>> and then update modem proc to authenticate and boot fw.
>>>> Also make a trivial change in a error log.
>>>>
>>>> Signed-off-by: Avaneesh Kumar Dwivedi <akdwived@...eaurora.org>
>>>> ---
>>>>    drivers/remoteproc/qcom_q6v5_pil.c | 25 ++++++++++++-------------
>>>>    1 file changed, 12 insertions(+), 13 deletions(-)
>>>>
>>>> diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
>>>> index 8fd697a..2626954 100644
>>>> --- a/drivers/remoteproc/qcom_q6v5_pil.c
>>>> +++ b/drivers/remoteproc/qcom_q6v5_pil.c
>>>> @@ -466,9 +466,10 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw)
>>>>          ret = q6v5_rmb_mba_wait(qproc, RMB_MBA_META_DATA_AUTH_SUCCESS, 1000);
>>>>        if (ret == -ETIMEDOUT)
>>>> -        dev_err(qproc->dev, "MPSS header authentication timed out\n");
>>>> +        dev_err(qproc->dev, "metadata authentication timed out\n");
>>>>        else if (ret < 0)
>>>> -        dev_err(qproc->dev, "MPSS header authentication failed: %d\n", ret);
>>>> +        dev_err(qproc->dev,
>>>> +            "metadata authentication failed: %d\n", ret);
>>>>          dma_free_attrs(qproc->dev, fw->size, ptr, phys, dma_attrs);
>>>>    @@ -503,7 +504,7 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
>>>>        bool relocate = false;
>>>>        char seg_name[10];
>>>>        ssize_t offset;
>>>> -    size_t size;
>>>> +    size_t size = 0;
>>>>        void *ptr;
>>>>        int ret;
>>>>        int i;
>>>> @@ -541,7 +542,9 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
>>>>        }
>>>>          mpss_reloc = relocate ? min_addr : qproc->mpss_phys;
>>>> -
>>>> +    /* Load firmware completely before letting mss to start
>>>> +     * authentication and then boot firmware
>>>> +     */
>>>>        for (i = 0; i < ehdr->e_phnum; i++) {
>>>>            phdr = &phdrs[i];
>>>>    @@ -574,17 +577,13 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
>>>>                memset(ptr + phdr->p_filesz, 0,
>>>>                       phdr->p_memsz - phdr->p_filesz);
>>>>            }
>>>> -
>>>> -        size = readl(qproc->rmb_base + RMB_PMI_CODE_LENGTH_REG);
>>>> -        if (!size) {
>>>> -            boot_addr = relocate ? qproc->mpss_phys : min_addr;
>>>> -            writel(boot_addr, qproc->rmb_base + RMB_PMI_CODE_START_REG);
>>>> -            writel(RMB_CMD_LOAD_READY, qproc->rmb_base + RMB_MBA_COMMAND_REG);
>>>> -        }
>>>> -
>>>>            size += phdr->p_memsz;
>>>> -        writel(size, qproc->rmb_base + RMB_PMI_CODE_LENGTH_REG);
>>>>        }
>>> So while moving this down, can we use qcom_mdt_load instead for the mpss
>>> image loading part above ?
>> qcom_mdt_load() can not be used to load segments for mpss, as MPSS blobs are self authenticated.
>> while qcom_mdt_load() is used in cases where authentication of loaded blobs is done by trustzone.
>> for that qcom_mdt_load() does extra steps to send pas_id to trustzone and mem_setup() etc.
> Right, so my intention of asking this was if the code which does the calculation and
> loads the segments in qcom_mdt_load can somehow be abstracted out, so that future
> self authenticating rproc (even mpss in this case) can use them to load mdt ?
As i understand, you want to replace the piece of code which does parse 
mdt and load individual firmware blobs in a separate routine.
So that it can be called by any one without again doing parsing and 
loading for self authentication.?
Till now only MPSS does rely on self authentication, all other 
subsystems use qcom_mdt_load().
I think this is reason why the qcom_mdt_load() equivalent routine has 
not been used.
Bjorn may further add in this.
>
>>>> +    /* Transfer ownership of modem region with modem fw */
>>>> +    boot_addr = relocate ? qproc->mpss_phys : min_addr;
>>>> +    writel(boot_addr, qproc->rmb_base + RMB_PMI_CODE_START_REG);
>>>> +    writel(RMB_CMD_LOAD_READY, qproc->rmb_base + RMB_MBA_COMMAND_REG);
>>>> +    writel(size, qproc->rmb_base + RMB_PMI_CODE_LENGTH_REG);
>>> For ipq8074 [1], wcnss core has an Q6V5 version of the ip for which the
>>> initialization/boot sequence is pretty much the same as that has been added
>>> for msm8996 in this series. So wanted to understand if its better to
>>> use this remoteproc itself by keeping the Q6 and mpss parts separately (or)
>>> add a new remoteproc ?
>> Bjorn can better answer this query, but i believe this remoteproc can be extended to load
>> mpss part by adding private initialization for the IP.
> ya, the mpss part can be separated out, so that this can be a Q6 + MPSS (or) Q6 + WCNSS
> remoteproc. Was asking this to get the right way for adding the Q6 + WCNSS remoteproc,
> as the Q6 part is same what you have added for msm8996.
Again, i believe yes but leave Bjorn to make final comment.
>
> Regards,
>   Sricharan
>
>>> [1] https://patchwork.kernel.org/patch/9711725/
>>>
>>> Regards,
>>>    Sricharan
>>>
>>>>          ret = q6v5_rmb_mba_wait(qproc, RMB_MBA_AUTH_COMPLETE, 10000);
>>>>        if (ret == -ETIMEDOUT)
>>>>

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