[alsa-devel] [PATCH v4 2/2] ASoC: Intel: Skylake: large_config_get overhaul

[Cezary Rojewski]

On 2019-08-08 16:50, Pierre-Louis Bossart wrote:
> Thanks Cezary, the split makes it much easier to review. I have a couple 
> of minor comments below, looks good otherwise.
> 
> On 8/8/19 5:24 AM, Cezary Rojewski wrote:
>> LARGE_CONFIG_GET is mainly used to retrieve requested module parameters
>> but it may also carry TX payload with them. Update its implementation to
>> account for both TX and RX data.
>> First reply.header carries total payload size within data_off_sizefield.
>> Make use of reply.header to realloc returned buffer with correct size.
>>
>> Failure of IPC request is permissive - error-payload may be returned, an
>> informative data why GET for given param failed - and thus function
>> should not collapse before entire processing is finished. Caller is
>> responsible for checking returned payload and bytes parameters.
> 
> but that is the same as before, yes? this patch does not change the 
> behavior on errors?

To evaluate this statement you have to take a look at old code (before 
addition of reply saving):

ret = sst_ipc_tx_message_wait(ipc, *ipc_header, NULL, 0,
		      ((char *)param) + data_offset,
		      msg->param_data_size);
if (ret < 0) {
	dev_err(ipc->dev,
		"ipc: get large config fail, err: %d\n", ret);
	return ret;
}

Third and four parameter for sst_ipc_tx_message_wait denoted tx_data and 
tx_size in older version. As you can see, these are empty - no payload 
is carried, _get_ only awaits reply and copied data retrieved (breaks 
vendor case as described earlier).

Immediately after failure, function was collapsing. Some data might have 
been appended to "param" but size is unknown. However, due to lack of 
retrieval of said size, indeed one may say the behavior on errors did 
not really change. It's vital to highlight that changes added here (2/2 
patch) do not make function return right after receiving error though - 
buffer and size are updated for the caller before leaving the scope.

>>
>> Signed-off-by: Cezary Rojewski <cezary.rojewski at intel.com>
>> ---
>>   sound/soc/intel/skylake/skl-messages.c |  3 ++-
>>   sound/soc/intel/skylake/skl-sst-ipc.c  | 27 ++++++++++++++++++++------
>>   sound/soc/intel/skylake/skl-sst-ipc.h  |  3 ++-
>>   3 files changed, 25 insertions(+), 8 deletions(-)
>>
>> diff --git a/sound/soc/intel/skylake/skl-messages.c 
>> b/sound/soc/intel/skylake/skl-messages.c
>> index e8cc710f092b..84f0e6f58eb5 100644
>> --- a/sound/soc/intel/skylake/skl-messages.c
>> +++ b/sound/soc/intel/skylake/skl-messages.c
>> @@ -1379,11 +1379,12 @@ int skl_get_module_params(struct skl_dev *skl, 
>> u32 *params, int size,
>>                 u32 param_id, struct skl_module_cfg *mcfg)
>>   {
>>       struct skl_ipc_large_config_msg msg;
>> +    size_t bytes = size;
>>       msg.module_id = mcfg->id.module_id;
>>       msg.instance_id = mcfg->id.pvt_id;
>>       msg.param_data_size = size;
>>       msg.large_param_id = param_id;
>> -    return skl_ipc_get_large_config(&skl->ipc, &msg, params);
>> +    return skl_ipc_get_large_config(&skl->ipc, &msg, &params, &bytes);
>>   }
>> diff --git a/sound/soc/intel/skylake/skl-sst-ipc.c 
>> b/sound/soc/intel/skylake/skl-sst-ipc.c
>> index 196c80dadb1f..9d269a5f8bd9 100644
>> --- a/sound/soc/intel/skylake/skl-sst-ipc.c
>> +++ b/sound/soc/intel/skylake/skl-sst-ipc.c
>> @@ -969,12 +969,18 @@ int skl_ipc_set_large_config(struct 
>> sst_generic_ipc *ipc,
>>   EXPORT_SYMBOL_GPL(skl_ipc_set_large_config);
>>   int skl_ipc_get_large_config(struct sst_generic_ipc *ipc,
>> -        struct skl_ipc_large_config_msg *msg, u32 *param)
>> +        struct skl_ipc_large_config_msg *msg,
>> +        unsigned int **payload, size_t *bytes)
> 
> is there a specific reason why we don't use e.g. u32 for the payload? 
> u32 and u64 are used everywhere except here, is this intentional?

Hmm, the reason is probably just me - unintentional. Can replace with 
u32, sure.

>>   {
>>       struct skl_ipc_header header = {0};
>> -    struct sst_ipc_message request = {0}, reply = {0};
>> +    struct sst_ipc_message request, reply = {0};
>> +    unsigned int *buf;
>>       int ret;
>> +    reply.data = kzalloc(SKL_ADSP_W1_SZ, GFP_KERNEL);
>> +    if (!reply.data)
>> +        return -ENOMEM;
>> +
>>       header.primary = IPC_MSG_TARGET(IPC_MOD_MSG);
>>       header.primary |= IPC_MSG_DIR(IPC_MSG_REQUEST);
>>       header.primary |= IPC_GLB_TYPE(IPC_MOD_LARGE_CONFIG_GET);
>> @@ -986,12 +992,21 @@ int skl_ipc_get_large_config(struct 
>> sst_generic_ipc *ipc,
>>       header.extension |= IPC_FINAL_BLOCK(1);
>>       header.extension |= IPC_INITIAL_BLOCK(1);
>> -    request.header = *(u64 *)(&header);
>> -    reply.data = param;
>> -    reply.size = msg->param_data_size;
>> +    request.header = *(u64 *)&header;
>> +    request.data = *payload;
>> +    request.size = *bytes;
>> +    reply.size = SKL_ADSP_W1_SZ;
>> +
>>       ret = sst_ipc_tx_message_wait(ipc, request, &reply);
>>       if (ret < 0)
>> -        dev_err(ipc->dev, "ipc: get large config fail, err: %d\n", ret);
>> +        dev_err(ipc->dev, "ipc: get large config fail: %d\n", ret);
> 
> nit-pick: cosmetic change unrelated to this patch.
> 

Exterminating, roger.

>> +
>> +    reply.size = (reply.header >> 32) & IPC_DATA_OFFSET_SZ_MASK;
>> +    buf = krealloc(reply.data, reply.size, GFP_KERNEL);
>> +    if (!buf)
>> +        return -ENOMEM;
>> +    *payload = buf;
>> +    *bytes = reply.size;
>>       return ret;
>>   }
>> diff --git a/sound/soc/intel/skylake/skl-sst-ipc.h 
>> b/sound/soc/intel/skylake/skl-sst-ipc.h
>> index 93af08cf41d2..a7ab2c589cc5 100644
>> --- a/sound/soc/intel/skylake/skl-sst-ipc.h
>> +++ b/sound/soc/intel/skylake/skl-sst-ipc.h
>> @@ -139,7 +139,8 @@ int skl_ipc_set_large_config(struct 
>> sst_generic_ipc *ipc,
>>           struct skl_ipc_large_config_msg *msg, u32 *param);
>>   int skl_ipc_get_large_config(struct sst_generic_ipc *ipc,
>> -        struct skl_ipc_large_config_msg *msg, u32 *param);
>> +        struct skl_ipc_large_config_msg *msg,
>> +        unsigned int **payload, size_t *bytes);
>>   int skl_sst_ipc_load_library(struct sst_generic_ipc *ipc,
>>               u8 dma_id, u8 table_id, bool wait);
>>