From: James Morse <james.morse@arm.com> 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/... --------------------------- 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: James Morse <james.morse@arm.com> Signed-off-by: Zeng Heng <zengheng4@huawei.com> --- drivers/platform/mpam/mpam_resctrl.c | 28 ++++++++++++++++++++++++++++ include/linux/arm_mpam.h | 3 +++ 2 files changed, 31 insertions(+) diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c index 19a7807f8013..01d43ce9911a 100644 --- a/drivers/platform/mpam/mpam_resctrl.c +++ b/drivers/platform/mpam/mpam_resctrl.c @@ -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(); diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h index e2428a0dbe2f..3ba466659058 100644 --- a/include/linux/arm_mpam.h +++ b/include/linux/arm_mpam.h @@ -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 */ -- 2.25.1