x86/sched/itmt: Give all SMT siblings of a core the same priority

X86 does not have the SD_ASYM_PACKING flag in the SMT domain. The scheduler
knows how to handle SMT and non-SMT cores of different priority. There is
no reason for SMT siblings of a core to have different priorities.

Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Len Brown <len.brown@intel.com>
Tested-by: Zhang Rui <rui.zhang@intel.com>
Link: https://lore.kernel.org/r/20230406203148.19182-12-ricardo.neri-calderon@linux.intel.com

diff --git a/arch/x86/kernel/itmt.c b/arch/x86/kernel/itmt.c
index 670eb08..ee4fe8c 100644 (file)
--- a/arch/x86/kernel/itmt.c
+++ b/arch/x86/kernel/itmt.c
@@ -165,32 +165,19 @@ int arch_asym_cpu_priority(int cpu)
 
 /**
  * sched_set_itmt_core_prio() - Set CPU priority based on ITMT
- * @prio:      Priority of cpu core
- * @core_cpu:  The cpu number associated with the core
+ * @prio:      Priority of @cpu
+ * @cpu:       The CPU number
  *
  * The pstate driver will find out the max boost frequency
  * and call this function to set a priority proportional
- * to the max boost frequency. CPU with higher boost
+ * to the max boost frequency. CPUs with higher boost
  * frequency will receive higher priority.
  *
  * No need to rebuild sched domain after updating
  * the CPU priorities. The sched domains have no
  * dependency on CPU priorities.
  */
-void sched_set_itmt_core_prio(int prio, int core_cpu)
+void sched_set_itmt_core_prio(int prio, int cpu)
 {
-       int cpu, i = 1;
-
-       for_each_cpu(cpu, topology_sibling_cpumask(core_cpu)) {
-               int smt_prio;
-
-               /*
-                * Ensure that the siblings are moved to the end
-                * of the priority chain and only used when
-                * all other high priority cpus are out of capacity.
-                */
-               smt_prio = prio * smp_num_siblings / (i * i);
-               per_cpu(sched_core_priority, cpu) = smt_prio;
-               i++;
-       }
+       per_cpu(sched_core_priority, cpu) = prio;
 }