Commit ad226e52 authored by Fenghua Yu's avatar Fenghua Yu Committed by Xiaochen Shen
Browse files

x86/resctrl: Add sparse_masks file in info 

mainline inclusion
from mainline-v6.7-rc1
commit 4dba8f10b8fef9c5b0f9ed83dd1af91a1795ead1
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I8WO9B
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4dba8f10b8fef9c5b0f9ed83dd1af91a1795ead1



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

Add the interface in resctrl FS to show if sparse cache allocation
bit masks are supported on the platform. Reading the file returns
either a "1" if non-contiguous 1s are supported and "0" otherwise.
The file path is /sys/fs/resctrl/info/{resource}/sparse_masks, where
{resource} can be either "L2" or "L3".

Intel-SIG: commit 4dba8f10b8fe x86/resctrl: Add sparse_masks file in info.
Incremental backporting patches for Intel RDT on Intel Xeon platform.

Signed-off-by: default avatarFenghua Yu <fenghua.yu@intel.com>
Signed-off-by: default avatarMaciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Signed-off-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: default avatarPeter Newman <peternewman@google.com>
Reviewed-by: default avatarReinette Chatre <reinette.chatre@intel.com>
Reviewed-by: default avatarBabu Moger <babu.moger@amd.com>
Tested-by: default avatarPeter Newman <peternewman@google.com>
Link: https://lore.kernel.org/r/7300535160beba41fd8aa073749ec1ee29b4621f.1696934091.git.maciej.wieczor-retman@intel.com


Signed-off-by: default avatarXiaochen Shen <xiaochen.shen@intel.com>
parent 63186094

arch/x86/kernel/cpu/resctrl/rdtgroup.c

+18 −0
Original line number Diff line number Diff line
@@ -1117,6 +1117,17 @@ static enum resctrl_conf_type resctrl_peer_type(enum resctrl_conf_type my_type) 
	}

}



static int rdt_has_sparse_bitmasks_show(struct kernfs_open_file *of,

					struct seq_file *seq, void *v)

{

	struct resctrl_schema *s = of->kn->parent->priv;

	struct rdt_resource *r = s->res;



	seq_printf(seq, "%u\n", r->cache.arch_has_sparse_bitmasks);



	return 0;

}



/**

 * __rdtgroup_cbm_overlaps - Does CBM for intended closid overlap with other

 * @r: Resource to which domain instance @d belongs.
@@ -1839,6 +1850,13 @@ static struct rftype res_common_files[] = { 
		.seq_show	= rdtgroup_size_show,

		.fflags		= RF_CTRL_BASE,

	},

	{

		.name		= "sparse_masks",

		.mode		= 0444,

		.kf_ops		= &rdtgroup_kf_single_ops,

		.seq_show	= rdt_has_sparse_bitmasks_show,

		.fflags		= RF_CTRL_INFO | RFTYPE_RES_CACHE,

	},



};