[PATCH v5 08/16] x86/resctrl: Expose assign_global_enable_per_cpu when PLZA is available

[Babu Moger]

Generic resctrl exposes kernel modes through sysfs only after architectures
register them with resctrl_set_kmode_support().

PLZA provides per-CPU kernel mode allocation and monitoring assignment, but
assign_global_enable_per_cpu is never registered during x86 initialization.

Register RESCTRL_ASSIGN_GLOBAL_ENABLE_PER_CPU when PLZA is available and
resctrl allocation or monitoring resources are present.

Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
v5: Update the patch to adapt new data structure and resctrl_set_kmode_support()
    changes.

v4: New patch to set the supported features during arch init.
---
 arch/x86/kernel/cpu/resctrl/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 4ca8bedeb995..39d6a2a60805 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -1021,6 +1021,10 @@ static __init bool get_rdt_resources(void)
 	rdt_alloc_capable = get_rdt_alloc_resources();
 	rdt_mon_capable = get_rdt_mon_resources();
 
+	if (rdt_cpu_has(X86_FEATURE_PLZA) &&
+	    (rdt_alloc_capable || rdt_mon_capable))
+		resctrl_set_kmode_support(RESCTRL_ASSIGN_GLOBAL_ENABLE_PER_CPU);
+
 	return (rdt_mon_capable || rdt_alloc_capable);
 }
 
-- 
2.43.0