linux-kernel - Re: [PATCH 10/18] rpmsg: glink: Add support for TX intents

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Date:   Tue, 22 Aug 2017 18:05:36 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     Arun Kumar Neelakantam <aneela@...eaurora.org>, ohad@...ery.com,
        bjorn.andersson@...aro.org, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 10/18] rpmsg: glink: Add support for TX intents

Hi,

<snip>

> 
> spinlock intent_lock initialization is missed ?

 right, should add that.

>>       kref_init(&channel->refcount);
>>         return channel;
>> @@ -187,6 +215,7 @@ static void qcom_glink_channel_release(struct kref *ref)
>>       struct glink_channel *channel = container_of(ref, struct glink_channel,
>>                                refcount);
>>   +    idr_destroy(&channel->liids);
> 
> idr_destroy shouldn`t be covered by intent_lock ?
> 

 hmm, will fix this.

>>       kfree(channel->name);
>>       kfree(channel);
>>   }
>> @@ -423,6 +452,130 @@ static void qcom_glink_receive_version_ack(struct qcom_glink *glink,
>>       }
>>   }
>>   +/**
>> + * qcom_glink_send_intent_req_ack() - convert an rx intent request ack cmd to
>> +                      wire format and transmit
>> + * @glink:    The transport to transmit on.
>> + * @channel:    The glink channel
>> + * @granted:    The request response to encode.
>> + *
>> + * Return: 0 on success or standard Linux error code.
>> + */
>> +static int qcom_glink_send_intent_req_ack(struct qcom_glink *glink,
>> +                      struct glink_channel *channel,
>> +                      bool granted)
>> +{
>> +    struct glink_msg msg;
>> +
>> +    msg.cmd = cpu_to_le16(RPM_CMD_RX_INTENT_REQ_ACK);
>> +    msg.param1 = cpu_to_le16(channel->lcid);
>> +    msg.param2 = cpu_to_le32(granted);
>> +
>> +    qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true);
>> +
>> +    return 0;
>> +}
>> +
>> +/**
>> + * tx_cmd_local_rx_intent() - convert an rx intent cmd to wire format and
>> + *               transmit
> 
> copy-paste mistake

 ok.

>> + * @glink:    The transport to transmit on.
>> + * @channel:    The local channel
>> + * @size:    The intent to pass on to remote.
>> + *
>> + * Return: 0 on success or standard Linux error code.
>> + */
>> +static int qcom_glink_advertise_intent(struct qcom_glink *glink,
>> +                       struct glink_channel *channel,
>> +                       struct glink_core_rx_intent *intent)
>> +{
>> +    struct command {
>> +        u16 id;
>> +        u16 lcid;
>> +        u32 count;
>> +        u32 size;
>> +        u32 liid;
>> +    } __packed;
>> +    struct command cmd;
>> +
>> +    cmd.id = cpu_to_le16(RPM_CMD_INTENT);
>> +    cmd.lcid = cpu_to_le16(channel->lcid);
>> +    cmd.count = cpu_to_le32(1);
>> +    cmd.size = cpu_to_le32(intent->size);
>> +    cmd.liid = cpu_to_le32(intent->id);
>> +
>> +    qcom_glink_tx(glink, &cmd, sizeof(cmd), NULL, 0, true);
>> +
>> +    return 0;
>> +}
>> +
>> +static struct glink_core_rx_intent *
>> +qcom_glink_alloc_intent(struct qcom_glink *glink,
>> +            struct glink_channel *channel,
>> +            size_t size,
>> +            bool reuseable)
>> +{
>> +    struct glink_core_rx_intent *intent;
>> +    int ret;
>> +    unsigned long flags;
>> +
>> +    intent = kzalloc(sizeof(*intent), GFP_KERNEL);
>> +
>> +    if (!intent)
>> +        return NULL;
>> +
>> +    intent->data = kzalloc(size, GFP_KERNEL);
>> +    if (!intent->data)
>> +        return NULL;
>> +
>> +    spin_lock_irqsave(&channel->intent_lock, flags);
>> +    ret = idr_alloc_cyclic(&channel->liids, intent, 1, -1, GFP_ATOMIC);
>> +    if (ret < 0) {
>> +        spin_unlock_irqrestore(&channel->intent_lock, flags);
>> +        return NULL;
>> +    }
>> +    spin_unlock_irqrestore(&channel->intent_lock, flags);
>> +
>> +    intent->id = ret;
>> +    intent->size = size;
>> +    intent->reuse = reuseable;
>> +
>> +    return intent;
>> +}
>> +
>> +/**
>> + * glink_core_rx_cmd_remote_rx_intent_req() - Receive a request for rx_intent
>> + *                        from remote side
> 
> copy-paste mistake

 ok.

Regards,
 Sricharan

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