linux-kernel - RE: [EXT] Re: [PATCH] media: amphion: handle firmware debug message

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Message-ID: <AM6PR04MB6341A4AA8D9FA47C250EDE05E71CA@AM6PR04MB6341.eurprd04.prod.outlook.com>
Date:   Wed, 23 Aug 2023 01:34:22 +0000
From:   Ming Qian <ming.qian@....com>
To:     Nicolas Dufresne <nicolas@...fresne.ca>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>
CC:     "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "X.H. Bao" <xiahong.bao@....com>, Eagle Zhou <eagle.zhou@....com>,
        Tao Jiang <tao.jiang_2@....com>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [EXT] Re: [PATCH] media: amphion: handle firmware debug message

>Hi,
>
>Le mardi 22 août 2023 à 13:52 +0800, Ming Qian a écrit :
>> decoder firmware may notify host some debug message, it can help
>> analyze the state of the firmware in case of error
>>
>> Fixes: 9f599f351e86 ("media: amphion: add vpu core driver")
>> Signed-off-by: Ming Qian <ming.qian@....com>
>> ---
>>  drivers/media/platform/amphion/vpu_defs.h    | 1 +
>>  drivers/media/platform/amphion/vpu_helpers.c | 1 +
>> drivers/media/platform/amphion/vpu_malone.c  | 1 +
>>  drivers/media/platform/amphion/vpu_msgs.c    | 9 +++++++++
>>  4 files changed, 12 insertions(+)
>>
>> diff --git a/drivers/media/platform/amphion/vpu_defs.h
>> b/drivers/media/platform/amphion/vpu_defs.h
>> index 667637eedb5d..7320852668d6 100644
>> --- a/drivers/media/platform/amphion/vpu_defs.h
>> +++ b/drivers/media/platform/amphion/vpu_defs.h
>> @@ -71,6 +71,7 @@ enum {
>>       VPU_MSG_ID_TIMESTAMP_INFO,
>>       VPU_MSG_ID_FIRMWARE_XCPT,
>>       VPU_MSG_ID_PIC_SKIPPED,
>> +     VPU_MSG_ID_DBG_MSG,
>>  };
>>
>>  enum VPU_ENC_MEMORY_RESOURSE {
>> diff --git a/drivers/media/platform/amphion/vpu_helpers.c
>> b/drivers/media/platform/amphion/vpu_helpers.c
>> index af3b336e5dc3..d12310af9ebc 100644
>> --- a/drivers/media/platform/amphion/vpu_helpers.c
>> +++ b/drivers/media/platform/amphion/vpu_helpers.c
>> @@ -489,6 +489,7 @@ const char *vpu_id_name(u32 id)
>>       case VPU_MSG_ID_UNSUPPORTED: return "unsupported";
>>       case VPU_MSG_ID_FIRMWARE_XCPT: return "exception";
>>       case VPU_MSG_ID_PIC_SKIPPED: return "skipped";
>> +     case VPU_MSG_ID_DBG_MSG: return "debug msg";
>>       }
>>       return "<unknown>";
>>  }
>> diff --git a/drivers/media/platform/amphion/vpu_malone.c
>> b/drivers/media/platform/amphion/vpu_malone.c
>> index f771661980c0..d3425de7bccd 100644
>> --- a/drivers/media/platform/amphion/vpu_malone.c
>> +++ b/drivers/media/platform/amphion/vpu_malone.c
>> @@ -745,6 +745,7 @@ static struct vpu_pair malone_msgs[] = {
>>       {VPU_MSG_ID_UNSUPPORTED,
>VID_API_EVENT_UNSUPPORTED_STREAM},
>>       {VPU_MSG_ID_FIRMWARE_XCPT, VID_API_EVENT_FIRMWARE_XCPT},
>>       {VPU_MSG_ID_PIC_SKIPPED, VID_API_EVENT_PIC_SKIPPED},
>> +     {VPU_MSG_ID_DBG_MSG, VID_API_EVENT_DBG_MSG_DEC},
>>  };
>>
>>  static void vpu_malone_pack_fs_alloc(struct vpu_rpc_event *pkt, diff
>> --git a/drivers/media/platform/amphion/vpu_msgs.c
>> b/drivers/media/platform/amphion/vpu_msgs.c
>> index d0ead051f7d1..999efeaebfd5 100644
>> --- a/drivers/media/platform/amphion/vpu_msgs.c
>> +++ b/drivers/media/platform/amphion/vpu_msgs.c
>> @@ -180,6 +180,14 @@ static void vpu_session_handle_pic_skipped(struct
>vpu_inst *inst, struct vpu_rpc
>>       vpu_inst_unlock(inst);
>>  }
>>
>> +static void vpu_session_handle_dbg_msg(struct vpu_inst *inst, struct
>> +vpu_rpc_event *pkt) {
>> +     char *str = (char *)pkt->data;
>> +
>> +     if (strlen(str))
>> +             dev_info(inst->dev, "instance %d firmware dbg msg :
>> + %s\n", inst->id, str);
>
>I'm always a bit worried when a string is assumed nul-terminated and it
>comes from a third party software (firmware). Perhaps we force it to
>terminate somewhere already ? With this being verified (or corrected):
>
>Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
>

Hi Nicolas,
    thanks for your reminder, I will force it to terminate at the end of the array in v2 patch.
Ming

>> +}
>> +
>>  static struct vpu_msg_handler handlers[] = {
>>       {VPU_MSG_ID_START_DONE, vpu_session_handle_start_done},
>>       {VPU_MSG_ID_STOP_DONE, vpu_session_handle_stop_done}, @@ -
>196,6
>> +204,7 @@ static struct vpu_msg_handler handlers[] = {
>>       {VPU_MSG_ID_UNSUPPORTED, vpu_session_handle_error},
>>       {VPU_MSG_ID_FIRMWARE_XCPT, vpu_session_handle_firmware_xcpt},
>>       {VPU_MSG_ID_PIC_SKIPPED, vpu_session_handle_pic_skipped},
>> +     {VPU_MSG_ID_DBG_MSG, vpu_session_handle_dbg_msg},
>>  };
>>
>>  static int vpu_session_handle_msg(struct vpu_inst *inst, struct
>> vpu_rpc_event *msg)