Commit a1390bb0 authored by Zhang Zekun's avatar Zhang Zekun Committed by Zhong Jinghua
Browse files

soc: hisilicon: hisi_hbmdev: Provide extra memory topology information 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I67QNJ


CVE: NA

--------------------------------------------------

Provide additional memory device topology information in
hisi_hbmdev. This memory topology informaton can provide
useful information for userspace to select the closest
memory device to a certain cpu.

Signed-off-by: default avatarZhang Zekun <zhangzekun11@huawei.com>
Reviewed-by: default avatarKefeng Wang <wangkefeng.wang@huawei.com>
parent 27443370

drivers/soc/hisilicon/Kconfig

+6 −3
Original line number Diff line number Diff line
@@ -9,9 +9,12 @@ config HISI_HBMDEV 
	depends on ACPI_HOTPLUG_MEMORY

	select ACPI_CONTAINER

	help

	  This driver add extra supports for memory devices. The driver

	  provides methods for userpace to control the power of memory

	  devices in a container.

	  This driver add two extra supports for memory devices. The driver

	  provides methods for userpace to control the power of memory devices

	  in a container. Besides, it provides extra locality information

	  between cpus and memory devices for userspace, which can take

	  advantage of this functionality to select the closet memory device

	  to a certain cpu.



	  To compile this driver as a module, choose M here:

	  the module will be called hisi_hbmdev.

drivers/soc/hisilicon/hisi_hbmdev.c

+61 −0
Original line number Diff line number Diff line
@@ -8,6 +8,9 @@ 
#include <linux/nodemask.h>

#include <linux/acpi.h>

#include <linux/container.h>

#include <linux/node.h>

#include <linux/arch_topology.h>

#include <linux/memory_hotplug.h>



#include "hisi_internal.h"
@@ -21,11 +24,67 @@ struct cdev_node { 


struct memory_dev {

	struct kobject *memdev_kobj;

	struct kobject *topo_kobj;

	struct cdev_node cdev_list;

	nodemask_t cluster_cpumask[MAX_NUMNODES];

};



static struct memory_dev *mdev;



static ssize_t memory_locality_show(struct kobject *kobj,

				   struct kobj_attribute *attr,

				   char *buf)

{

	int i, count = 0;



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

		if (hotplug_mdev[i] != NULL && !nodes_empty(mdev->cluster_cpumask[i])) {

			count += sysfs_emit_at(buf, count, "%d %*pbl\n", i,

					       nodemask_pr_args(&mdev->cluster_cpumask[i]));

		}

	}



	return count;

}



static struct kobj_attribute memory_locality_attribute =

	__ATTR(memory_locality, 0444, memory_locality_show, NULL);



static void memory_topo_init(void)

{

	int ret, nid, cluster_id, cpu;

	struct acpi_device *adev;

	nodemask_t mask;



	for (nid = 0; nid < MAX_NUMNODES; nid++) {

		if (!hotplug_mdev[nid])

			continue;



		adev = hotplug_mdev[nid];

		ret = fwnode_property_read_u32(acpi_fwnode_handle(adev),

						"cluster-id", &cluster_id);

		if (ret < 0) {

			pr_debug("Failed to read cluster id\n");

			return;

		}



		nodes_clear(mask);

		for_each_possible_cpu(cpu) {

			if (topology_cluster_id(cpu) == cluster_id)

				node_set(cpu, mask);

		}

		mdev->cluster_cpumask[nid] = mask;

	}



	mdev->topo_kobj = kobject_create_and_add("memory_topo", mdev->memdev_kobj);

	if (!mdev->topo_kobj)

		return;



	ret = sysfs_create_file(mdev->topo_kobj, &memory_locality_attribute.attr);

	if (ret)

		kobject_put(mdev->topo_kobj);

}



static int get_pxm(struct acpi_device *acpi_device, void *arg)

{

	acpi_handle handle = acpi_device->handle;
@@ -224,6 +283,7 @@ static int __init mdev_init(void) 
		return -ENOMEM;

	}



	memory_topo_init();

	return ret;

}

module_init(mdev_init);
@@ -232,6 +292,7 @@ static void __exit mdev_exit(void) 
{

	container_remove();

	kobject_put(mdev->memdev_kobj);

	kobject_put(mdev->topo_kobj);

	kfree(mdev);

}

module_exit(mdev_exit);