Commit 31cffdeb authored by Wang ShaoBo's avatar Wang ShaoBo Committed by Zheng Zengkai
Browse files

arm64/mpam: resctrl: Support cpus' monitoring for mon group 



hulk inclusion
category: feature
feature: ARM MPAM support
bugzilla: 48265
CVE: NA

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

So far each mon group is tagged by sd_closid, we can monitor data by
switching cpus' sd_closid.reqpartid and pmg, and ensuring consistent
configuration for mon groups by following it's parent ctrl group through
sd_closid.intpartid.

Most of this code is borrowed from Intel-RDT.

Signed-off-by: default avatarWang ShaoBo <bobo.shaobowang@huawei.com>
Reviewed-by: default avatarXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: default avatarCheng Jian <cj.chengjian@huawei.com>
Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent f098705e

arch/arm64/kernel/mpam/mpam_resctrl.c

+38 −2
Original line number Diff line number Diff line
@@ -967,10 +967,46 @@ static int resctrl_num_mon_show(struct kernfs_open_file *of, 
int cpus_mon_write(struct rdtgroup *rdtgrp, cpumask_var_t newmask,

		   cpumask_var_t tmpmask)

{

	pr_info("unsupported on mon_groups, please use ctrlmon groups\n");

	struct rdtgroup *prgrp = rdtgrp->mon.parent, *crgrp;

	struct list_head *head;



	/* Check whether cpus belong to parent ctrl group */

	cpumask_andnot(tmpmask, newmask, &prgrp->cpu_mask);

	if (cpumask_weight(tmpmask)) {

		rdt_last_cmd_puts("can only add CPUs to mongroup that belong to parent\n");

		return -EINVAL;

	}



	/* Check whether cpus are dropped from this group */

	cpumask_andnot(tmpmask, &rdtgrp->cpu_mask, newmask);

	if (cpumask_weight(tmpmask)) {

		/* Give any dropped cpus to parent rdtgroup */

		cpumask_or(&prgrp->cpu_mask, &prgrp->cpu_mask, tmpmask);

		update_closid_rmid(tmpmask, prgrp);

	}



	/*

	 * If we added cpus, remove them from previous group that owned them

	 * and update per-cpu rmid

	 */

	cpumask_andnot(tmpmask, newmask, &rdtgrp->cpu_mask);

	if (cpumask_weight(tmpmask)) {

		head = &prgrp->mon.crdtgrp_list;

		list_for_each_entry(crgrp, head, mon.crdtgrp_list) {

			if (crgrp == rdtgrp)

				continue;

			cpumask_andnot(&crgrp->cpu_mask, &crgrp->cpu_mask,

				tmpmask);

		}

		update_closid_rmid(tmpmask, rdtgrp);

	}



	/* Done pushing/pulling - update this group with new mask */

	cpumask_copy(&rdtgrp->cpu_mask, newmask);



	return 0;

}



static ssize_t resctrl_group_cpus_write(struct kernfs_open_file *of,

				   char *buf, size_t nbytes, loff_t off)

{