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SubjectRe: [PATCHv4 3/8] gpu: host1x: Add channel support
On 01/02/2013 05:31 PM, Terje Bergström wrote:
> On 02.01.2013 09:40, Mark Zhang wrote:
>> On 12/21/2012 07:39 PM, Terje Bergstrom wrote:
>>> Add support for host1x client modules, and host1x channels to submit
>>> work to the clients. The work is submitted in GEM CMA buffers, so
>>> this patch adds support for them.
>>>
>>> Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
>>> ---
>> [...]
>>> +/*
>>> + * Begin a cdma submit
>>> + */
>>> +int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job)
>>> +{
>>> + struct host1x *host1x = cdma_to_host1x(cdma);
>>> +
>>> + mutex_lock(&cdma->lock);
>>> +
>>> + if (job->timeout) {
>>> + /* init state on first submit with timeout value */
>>> + if (!cdma->timeout.initialized) {
>>> + int err;
>>> + err = host1x->cdma_op.timeout_init(cdma,
>>> + job->syncpt_id);
>>> + if (err) {
>>> + mutex_unlock(&cdma->lock);
>>> + return err;
>>> + }
>>> + }
>>> + }
>>> + if (!cdma->running)
>>> + host1x->cdma_op.start(cdma);
>>> +
>>> + cdma->slots_free = 0;
>>> + cdma->slots_used = 0;
>>> + cdma->first_get = host1x->cdma_pb_op.putptr(&cdma->push_buffer);
>>> +
>>> + trace_host1x_cdma_begin(job->ch->dev->name);
>>
>> Seems missing "mutex_unlock(&cdma->lock);" here.
>
> That's intentional. Writing a job to channel is atomic, so lock is taken
> from host1x_cdma_begin() until host1x_cdma_end().
>

Okay. So can we consider that lock and unlock this mutex in the function
which calls host1x_cdma_begin and host1x_cdma_end, that means, in
current implementation, function "channel_submit"?

Mark
> Terje
>
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