On Wed, Jun 07, 2023 at 05:47:30PM +0530, Manikanta Mylavarapu wrote:
> In case of heavy cpu load, rx worker thread
> not able to get cpu slot because it's bound
> to kernel global work queue.
>
> Glink client drivers will return timeout
> error if they didn't receive response
> within stipulated duration. Changing rx
> work queue type to UNBOUND workqueue
> ensures rx worker thread will be executed
> as early as possible.
>
I'm guessing that you're referring to the fact that incoming intent
requests (GLINK_CMD_RX_INTENT_REQ) are handled in the rx_worker. But I
shouldn't have to guess, please improve your commit message to be
slightly more specific.
Could we/should we handle the intent requests differently?
Please also use 75 character long lines in your commit message.
> Signed-off-by: Manikanta Mylavarapu <quic_mmanikan@xxxxxxxxxxx>
> ---
> drivers/rpmsg/qcom_glink_native.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
> index 1beb40a1d3df..6f9a439e5046 100644
> --- a/drivers/rpmsg/qcom_glink_native.c
> +++ b/drivers/rpmsg/qcom_glink_native.c
> @@ -81,6 +81,7 @@ struct glink_core_rx_intent {
> * @rx_pipe: pipe object for receive FIFO
> * @tx_pipe: pipe object for transmit FIFO
> * @rx_work: worker for handling received control messages
> + * @rx_wq: work queue of rx_work
> * @rx_lock: protects the @rx_queue
> * @rx_queue: queue of received control messages to be processed in @rx_work
> * @tx_lock: synchronizes operations on the tx fifo
> @@ -100,6 +101,7 @@ struct qcom_glink {
> struct qcom_glink_pipe *tx_pipe;
>
> struct work_struct rx_work;
> + struct workqueue_struct *rx_wq;
> spinlock_t rx_lock;
> struct list_head rx_queue;
>
> @@ -822,7 +824,7 @@ static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra)
> list_add_tail(&dcmd->node, &glink->rx_queue);
> spin_unlock(&glink->rx_lock);
>
> - schedule_work(&glink->rx_work);
> + queue_work(glink->rx_wq, &glink->rx_work);
> qcom_glink_rx_advance(glink, sizeof(dcmd->msg) + extra);
>
> return 0;
> @@ -1665,6 +1667,8 @@ static void qcom_glink_cancel_rx_work(struct qcom_glink *glink)
> /* cancel any pending deferred rx_work */
> cancel_work_sync(&glink->rx_work);
>
> + destroy_workqueue(glink->rx_wq);
> +
> list_for_each_entry_safe(dcmd, tmp, &glink->rx_queue, node)
> kfree(dcmd);
> }
> @@ -1750,6 +1754,10 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev,
> INIT_WORK(&glink->rx_work, qcom_glink_work);
> init_waitqueue_head(&glink->tx_avail_notify);
>
> + glink->rx_wq = alloc_workqueue("glink_rx_wq", WQ_UNBOUND, 1);
Please see the description in e.g. 56310520308a ("soc: qcom: qmi: Use
alloc_ordered_workqueue() to create ordered workqueues")
Regards,
Bjorn
> + if (!glink->rx_wq)
> + return ERR_PTR(-ENOMEM);
> +
> spin_lock_init(&glink->idr_lock);
> idr_init(&glink->lcids);
> idr_init(&glink->rcids);
> --
> 2.17.1
>
