[ck] [PATCH openEuler v1 091/119] openEuler: arm64/mpam: add cmdline option: mpam

From: Xie XiuQi <xiexiuqi(a)huawei.com> commit 40ff7729c8c451e5c403554629aaf473e7b211df openEuler-1.0 hulk inclusion category: feature bugzilla: 10897 CVE: NA MPAM feature is just for debug and preview in this version, so disable it by default. You can enable it by cmdline: "mpam". Signed-off-by: Xie XiuQi <xiexiuqi(a)huawei.com> Reviewed-by: Yang Yingliang <yangyingliang(a)huawei.com> Signed-off-by: Yang Yingliang <yangyingliang(a)huawei.com> Signed-off-by: Xin Hao <haoxing990(a)gmail.com> --- arch/arm64/include/asm/mpam_sched.h | 2 ++ arch/arm64/kernel/mpam.c | 12 ++++++++++++ 2 files changed, 14 insertions(+) diff --git a/arch/arm64/include/asm/mpam_sched.h b/arch/arm64/include/asm/mpam_sched.h index 31522efbf8e5..14638793e53e 100644 --- a/arch/arm64/include/asm/mpam_sched.h +++ b/arch/arm64/include/asm/mpam_sched.h @@ -39,6 +39,8 @@ static inline void mpam_sched_in(void) __mpam_sched_in(); } +extern int __read_mostly mpam_enabled; + #else static inline void mpam_sched_in(void) {} diff --git a/arch/arm64/kernel/mpam.c b/arch/arm64/kernel/mpam.c index aa52e5896ac9..623e9f8d6d8e 100644 --- a/arch/arm64/kernel/mpam.c +++ b/arch/arm64/kernel/mpam.c @@ -1242,11 +1242,23 @@ static void mpam_domains_init(struct resctrl_resource *r) } } +int __read_mostly mpam_enabled; + +static int __init mpam_setup(char *str) +{ + mpam_enabled = 1; + return 1; +} +__setup("mpam", mpam_setup); + static int __init mpam_late_init(void) { struct resctrl_resource *r; int state, ret; + if (!mpam_enabled) + return 0; + if (!cpus_have_const_cap(ARM64_HAS_MPAM)) return -ENODEV; -- 2.31.0