Commit a4e70a80 authored by Wang ShaoBo's avatar Wang ShaoBo Committed by Zheng Zengkai
Browse files

arm64/mpam: resctrl: Supplement cdpl2,cdpl3 for mount options 



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

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

This supports cdpl2,cdpl3 parameters for mount options, some other options
including capabilities' feature such as priority and hardlimit will be
supported in the future, a simple example like this.

e.g.
   > mount -t resctrl resctrl /sys/fs/resctrl -o cdpl3
   > cd /sys/fs/resctrl && cat schemata
     L3CODE:0=7fff;1=7fff;2=7fff;3=7fff
     L3CODE:0=7fff;1=7fff;2=7fff;3=7fff
     MB:0=100;1=100;2=100;3=100

Note that we only complete this part interface adaption, not mean cdp is
supported currently.

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 cecf6c62

arch/arm64/kernel/mpam/mpam_resctrl.c

+73 −0
Original line number Diff line number Diff line
@@ -70,6 +70,12 @@ bool rdt_alloc_capable; 
 * Indicate the max number of monitor supported.

 */

static u32 max_mon_num;



/*

 * Indicate if had mount cdpl2/cdpl3 option.

 */

static bool resctrl_cdp_enabled;



/*

 * Hi1620 2P Base Address Map

 *
@@ -428,9 +434,76 @@ void release_rdtgroupfs_options(void) 
{

}



static void disable_cdp(void)

{

	struct mpam_resctrl_res *res;

	struct resctrl_resource *r;



	for_each_supported_resctrl_exports(res) {

		r = &res->resctrl_res;

		r->cdp_enable = false;

	}



	resctrl_cdp_enabled = false;

}



static int try_to_enable_cdp(enum resctrl_resource_level level)

{

	struct resctrl_resource *r = mpam_resctrl_get_resource(level);



	if (!r || !r->cdp_capable)

		return -EINVAL;



	r->cdp_enable = true;



	resctrl_cdp_enabled = true;

	return 0;

}



static int cdpl3_enable(void)

{

	return try_to_enable_cdp(RDT_RESOURCE_L3);

}



static int cdpl2_enable(void)

{

	return try_to_enable_cdp(RDT_RESOURCE_L2);

}



int parse_rdtgroupfs_options(char *data)

{

	char *token;

	char *o = data;

	int ret = 0;



	disable_cdp();



	while ((token = strsep(&o, ",")) != NULL) {

		if (!*token) {

			ret = -EINVAL;

			goto out;

		}



		if (!strcmp(token, "cdpl3")) {

			ret = cdpl3_enable();

			if (ret)

				goto out;

		} else if (!strcmp(token, "cdpl2")) {

			ret = cdpl2_enable();

			if (ret)

				goto out;

		} else {

			ret = -EINVAL;

			goto out;

		}

	}



	return 0;



out:

	pr_err("Invalid mount option \"%s\"\n", token);



	return ret;

}



/*