From 978fcca954cb52249babbc14e53de53c88dd6433 Mon Sep 17 00:00:00 2001 From: James Morse Date: Tue, 13 Feb 2024 18:44:35 +0000 Subject: x86/resctrl: Allow overflow/limbo handlers to be scheduled on any-but CPU When a CPU is taken offline resctrl may need to move the overflow or limbo handlers to run on a different CPU. Once the offline callbacks have been split, cqm_setup_limbo_handler() will be called while the CPU that is going offline is still present in the CPU mask. Pass the CPU to exclude to cqm_setup_limbo_handler() and mbm_setup_overflow_handler(). These functions can use a variant of cpumask_any_but() when selecting the CPU. -1 is used to indicate no CPUs need excluding. Signed-off-by: James Morse Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Shaopeng Tan Reviewed-by: Babu Moger Reviewed-by: Reinette Chatre Tested-by: Shaopeng Tan Tested-by: Peter Newman Tested-by: Babu Moger Tested-by: Carl Worth # arm64 Link: https://lore.kernel.org/r/20240213184438.16675-22-james.morse@arm.com Signed-off-by: Borislav Petkov (AMD) --- include/linux/resctrl.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include/linux') diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h index 4c4bad3c34e4..ccbbbe5d18d3 100644 --- a/include/linux/resctrl.h +++ b/include/linux/resctrl.h @@ -10,6 +10,8 @@ #define RESCTRL_RESERVED_CLOSID 0 #define RESCTRL_RESERVED_RMID 0 +#define RESCTRL_PICK_ANY_CPU -1 + #ifdef CONFIG_PROC_CPU_RESCTRL int proc_resctrl_show(struct seq_file *m, -- cgit v1.2.3