linux-kernel - [PATCH 2/2] rpmsg: glink: change intent work queue type

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Date:   Wed, 7 Jun 2023 17:47:31 +0530
From:   Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
To:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <mathieu.poirier@...aro.org>,
        <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <quic_srichara@...cinc.com>, <quic_sjaganat@...cinc.com>,
        <quic_kathirav@...cinc.com>, <quic_anusha@...cinc.com>,
        <quic_varada@...cinc.com>
Subject: [PATCH 2/2] rpmsg: glink: change intent work queue type

QDSP6 will clear heap memory once it's received
RX_DONE event from APPS. Under heavy cpu load
intent worker thread not able to get cpu slot
because it's bound to kernel global work queue.
Due to this QDSP6 firmware faces OOM and it leads
to Q6 crash. Changing intent work queue type to
UNBOUND workqueue ensures intent worker thread
will be executed as early as possible.

Signed-off-by: Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
---
 drivers/rpmsg/qcom_glink_native.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index 6f9a439e5046..c3e076bb863f 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -140,6 +140,7 @@ enum {
  * @liids:	idr of all local intents
  * @riids:	idr of all remote intents
  * @intent_work: worker responsible for transmitting rx_done packets
+ * @intent_wq:	work queue of intent_work
  * @done_intents: list of intents that needs to be announced rx_done
  * @buf:	receive buffer, for gathering fragments
  * @buf_offset:	write offset in @buf
@@ -169,6 +170,7 @@ struct glink_channel {
 	struct idr liids;
 	struct idr riids;
 	struct work_struct intent_work;
+	struct workqueue_struct *intent_wq;
 	struct list_head done_intents;
 
 	struct glink_core_rx_intent *buf;
@@ -231,6 +233,14 @@ static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink,
 	INIT_LIST_HEAD(&channel->done_intents);
 	INIT_WORK(&channel->intent_work, qcom_glink_rx_done_work);
 
+	channel->intent_wq = alloc_workqueue("intent_wq", WQ_UNBOUND, 1);
+	if (!channel->intent_wq) {
+		pr_err("failed to create %s channel intent work queue\n",
+		       channel->name);
+		kfree(channel);
+		return ERR_PTR(-ENOMEM);
+	}
+
 	idr_init(&channel->liids);
 	idr_init(&channel->riids);
 	kref_init(&channel->refcount);
@@ -270,6 +280,7 @@ static void qcom_glink_channel_release(struct kref *ref)
 	idr_destroy(&channel->riids);
 	spin_unlock_irqrestore(&channel->intent_lock, flags);
 
+	destroy_workqueue(channel->intent_wq);
 	kfree(channel->name);
 	kfree(channel);
 }
@@ -573,7 +584,7 @@ static void qcom_glink_rx_done(struct qcom_glink *glink,
 	list_add_tail(&intent->node, &channel->done_intents);
 	spin_unlock(&channel->intent_lock);
 
-	schedule_work(&channel->intent_work);
+	queue_work(channel->intent_wq, &channel->intent_work);
 }
 
 /**
-- 
2.17.1