Commit 7bd8d04a authored by Wang ShaoBo's avatar Wang ShaoBo Committed by Yang Yingliang
Browse files

arm64/mpam: Add helper for getting mpam sysprops 



hulk inclusion
category: feature
bugzilla: 34278
CVE: NA

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

Now mpam sysprops have been probed, maximum support of partid
and pmg should be exported to resctrl.

For MPAM, Processing elements (PEs) issue memory-system requests,
PEs must implement the MPAMn_ELx registers and their behaviors to
generate the PARTID and PMG fields of memory-system requests.

For resctrl, partid and pmg should be used to combined into a unique
rmid for labeling each group, and partid for determining the maximum
number of ctrl groups.

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 avatarCheng Jian <cj.chengjian@huawei.com>
parent 4b9ad72d

arch/arm64/kernel/mpam/mpam_device.c

+12 −0
Original line number Diff line number Diff line
@@ -676,3 +676,15 @@ void __init mpam_discovery_failed(void) 
	}

	mutex_unlock(&mpam_devices_lock);

}



u16 mpam_sysprops_num_partid(void)

{

	/* At least one partid for system width */

	return mpam_sysprops.max_partid + 1;

}



u16 mpam_sysprops_num_pmg(void)

{

	/* At least one pmg for system width */

	return mpam_sysprops.max_pmg + 1;

}

arch/arm64/kernel/mpam/mpam_internal.h

+3 −0
Original line number Diff line number Diff line
@@ -48,4 +48,7 @@ static inline void mpam_clear_feature(enum mpam_device_features feat, 


#define MPAM_ARCHITECTURE_V1    0x10



u16 mpam_sysprops_num_partid(void);

u16 mpam_sysprops_num_pmg(void);



#endif