On Wed, May 09, 2018 at 11:01:58AM -0600, Lina Iyer wrote:
> Platform drivers need make a lot of resource state requests at the same
> time, say, at the start or end of an usecase. It can be quite
> inefficient to send each request separately. Instead they can give the
> RPMH library a batch of requests to be sent and wait on the whole
> transaction to be complete.
>
> rpmh_write_batch() is a blocking call that can be used to send multiple
> RPMH command sets. Each RPMH command set is set asynchronously and the
> API blocks until all the command sets are complete and receive their
> tx_done callbacks.
>
> Signed-off-by: Lina Iyer <ilina@xxxxxxxxxxxxxx>
> ---
>
> Changes in v7:
> - Check for loop out of bounds
>
> Changes in v6:
> - replace rpmh_client with device *
> Changes in v4:
> - reorganize rpmh_write_batch()
> - introduce wait_count here, instead of patch#4
> ---
> drivers/soc/qcom/rpmh.c | 154 +++++++++++++++++++++++++++++++++++++++-
> include/soc/qcom/rpmh.h | 8 +++
> 2 files changed, 160 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
> index 1bb62876795c..a0e277b4b846 100644
> --- a/drivers/soc/qcom/rpmh.c
> +++ b/drivers/soc/qcom/rpmh.c
>
> ...
>
> +static int flush_batch(struct rpmh_ctrlr *ctrlr)
> +{
> + const struct rpmh_request *rpm_msg;
> + unsigned long flags;
> + int ret = 0;
> + int i;
> +
> + /* Send Sleep/Wake requests to the controller, expect no response */
> + spin_lock_irqsave(&ctrlr->lock, flags);
> + for (i = 0; ctrlr->batch_cache[i]; i++) {
I missed this earlier: the loop goes beyond ctrlr->batch_cache when
the batch cache is full.
> + rpm_msg = ctrlr->batch_cache[i];
> + ret = rpmh_rsc_write_ctrl_data(ctrlr->drv, &rpm_msg->msg);
> + if (ret)
> + break;
> + }
> + spin_unlock_irqrestore(&ctrlr->lock, flags);
> +
> + return ret;
> +}
> +
> +static void invalidate_batch(struct rpmh_ctrlr *ctrlr)
> +{
> + unsigned long flags;
> + int index = 0;
> +
> + spin_lock_irqsave(&ctrlr->lock, flags);
> + while (ctrlr->batch_cache[index]) {
This still goes beyond ctrlr->batch_cache when the batch cache is
full.
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