Commit 7f852b58 authored by James Morse's avatar James Morse Committed by Zeng Heng
Browse files

arm_mpam: resctrl: Add rmid index helpers 

maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8T2RT

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/log/?h=mpam/snapshot/v6.7-rc2



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

Because MPAM's pmg aren't identical to RDT's rmid, resctrl handles
some datastructrues by index. This allows x86 to map indexes to
RMID, and MPAM to map them to partid-and-pmg.

Add the helpers to do this.

Signed-off-by: default avatarJames Morse <james.morse@arm.com>
Signed-off-by: default avatarZeng Heng <zengheng4@huawei.com>
parent 9c3aafb9

drivers/platform/mpam/mpam_resctrl.c

+28 −0
Original line number Diff line number Diff line
@@ -93,6 +93,34 @@ u32 resctrl_arch_get_num_closid(struct rdt_resource *ignored) 
	return min((u32)mpam_partid_max + 1, (u32)RESCTRL_MAX_CLOSID);

}



u32 resctrl_arch_system_num_rmid_idx(void)

{

	u8 closid_shift = fls(mpam_pmg_max);

	u32 num_partid = resctrl_arch_get_num_closid(NULL);



	return num_partid << closid_shift;

}



u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid)

{

	u8 closid_shift = fls(mpam_pmg_max);



	BUG_ON(closid_shift > 8);



	return (closid << closid_shift) | rmid;

}



void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid)

{

	u8 closid_shift = fls(mpam_pmg_max);

	u32 pmg_mask = ~(~0 << closid_shift);



	BUG_ON(closid_shift > 8);



	*closid = idx >> closid_shift;

	*rmid = idx & pmg_mask;

}



void resctrl_sched_in(struct task_struct *tsk)

{

	lockdep_assert_preemption_disabled();

include/linux/arm_mpam.h

+3 −0
Original line number Diff line number Diff line
@@ -72,5 +72,8 @@ void resctrl_arch_set_cpu_default_closid(int cpu, u32 closid); 
void resctrl_arch_set_closid_rmid(struct task_struct *tsk, u32 closid, u32 rmid);

void resctrl_arch_set_cpu_default_closid_rmid(int cpu, u32 closid, u32 pmg);

void resctrl_sched_in(struct task_struct *tsk);

u32 resctrl_arch_rmid_idx_encode(u32 closid, u32 rmid);

void resctrl_arch_rmid_idx_decode(u32 idx, u32 *closid, u32 *rmid);

u32 resctrl_arch_system_num_rmid_idx(void);



#endif /* __LINUX_ARM_MPAM_H */