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Commit 9833da72 authored by Chris Lew's avatar Chris Lew Committed by Gerrit - the friendly Code Review server
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rpmsg: glink: Add option to affine resources to CPUs 



On certain systems, all resources for a specific usecase may be pinned
to a specific cpu set to meet power and performance requirements. Add
support to define a cpu set for the irq and rx thread in device tree.
This change does not include any hotplug support.

Change-Id: I0e18e3cb1880886dddf20ce0e2744e7af3b8b553
Signed-off-by: default avatarChris Lew <clew@codeaurora.org>
parent 1e465bc9

Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt

+5 −0
Original line number Diff line number Diff line
@@ -32,6 +32,11 @@ a GLINK SPSS edge and a SPI based edge. 
	Definition: reference to the "rpm_hlos" mailbox in APCS, as described

		    in mailbox/mailbox.txt



- cpu-affinity:

	Usage: optional

	Value type: <prop-encoded-array>

	Definition: cores to pin the irq to



= GLINK SPSS

The remote proc on a GLINK SPSS edge expects the descriptors and fifos to be

allocated by this processor. The following bindings are required to inform the

drivers/rpmsg/qcom_glink_native.c

+33 −1
Original line number Diff line number Diff line
@@ -1799,15 +1799,35 @@ static int qcom_glink_create_chrdev(struct qcom_glink *glink) 
	return rpmsg_chrdev_register_device(rpdev);

}



static void qcom_glink_set_affinity(struct qcom_glink *glink, u32 *arr,

				    size_t size)

{

	struct cpumask cpumask;

	int i;



	cpumask_clear(&cpumask);

	for (i = 0; i < size; i++) {

		if (arr[i] < num_possible_cpus())

			cpumask_set_cpu(arr[i], &cpumask);

	}

	if (irq_set_affinity(glink->irq, &cpumask))

		dev_err(glink->dev, "failed to set irq affinity\n");

	if (sched_setaffinity(glink->task->pid, &cpumask))

		dev_err(glink->dev, "failed to set task affinity\n");

}





struct qcom_glink *qcom_glink_native_probe(struct device *dev,

					   unsigned long features,

					   struct qcom_glink_pipe *rx,

					   struct qcom_glink_pipe *tx,

					   bool intentless)

{

	struct qcom_glink *glink;

	u32 *arr;

	int size;

	int irq;

	int ret;

	struct qcom_glink *glink;



	glink = devm_kzalloc(dev, sizeof(*glink), GFP_KERNEL);

	if (!glink)
@@ -1866,6 +1886,18 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev, 


	glink->irq = irq;



	size = of_property_count_u32_elems(dev->of_node, "cpu-affinity");

	if (size > 0) {

		arr = kmalloc_array(size, sizeof(u32), GFP_KERNEL);

		if (!arr)

			return ERR_PTR(-ENOMEM);

		ret = of_property_read_u32_array(dev->of_node, "cpu-affinity",

						 arr, size);

		if (!ret)

			qcom_glink_set_affinity(glink, arr, size);

		kfree(arr);

	}



	ret = qcom_glink_send_version(glink);

	if (ret) {

		dev_err(dev, "failed to send version %d\n", ret);