linux/cpukinds: use Intel PMU directories to detect Atom/Core cpusets on Intel hybrid

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

Author: bgoglin

doc/hwloc.doxy

@@ -2354,7 +2354,7 @@ as reported by some <tt>cpufreq</tt> drivers on Linux (e.g. <tt>intel_pstate</tt
 <dt>CoreType (x86)</dt>
 <dd>A string describing the kind of core,
 currently <tt>IntelAtom</tt> or <tt>IntelCore</tt>,
-as reported by the x86 CPUID instruction on some Intel processors.
+as reported by the x86 CPUID instruction and Linux PMU on some Intel processors.
 </dd>
 <dt>LinuxCapacity (Linux)</dt>
 <dd>The Linux-specific CPU capacity found in sysfs,

hwloc/topology-linux.c

@@ -4510,6 +4510,7 @@ look_sysfscpukinds(struct hwloc_topology *topology,
   int max_without_basefreq = 0; /* any cpu where we have maxfreq without basefreq? */
   char str[293];
   char *env;
+  hwloc_bitmap_t atom_pmu_set, core_pmu_set;
   int maxfreq_enabled = -1; /* -1 means adjust (default), 0 means ignore, 1 means enforce */
   unsigned adjust_max = 10;
   int i;
@@ -4573,6 +4574,28 @@ look_sysfscpukinds(struct hwloc_topology *topology,
   hwloc_linux_cpukinds_register(&cpu_capacity, topology, "LinuxCapacity", 1);
   hwloc_linux_cpukinds_destroy(&cpu_capacity);
 
+  /* look at Intel core/atom PMUs */
+  atom_pmu_set = hwloc__alloc_read_path_as_cpulist("/sys/devices/cpu_atom/cpus", data->root_fd);
+  core_pmu_set = hwloc__alloc_read_path_as_cpulist("/sys/devices/cpu_core/cpus", data->root_fd);
+  if (atom_pmu_set) {
+    struct hwloc_info_s infoattr;
+    infoattr.name = (char *) "CoreType";
+    infoattr.value = (char *) "IntelAtom";
+    hwloc_internal_cpukinds_register(topology, atom_pmu_set, HWLOC_CPUKIND_EFFICIENCY_UNKNOWN, &infoattr, 1, 0);
+    /* the cpuset is given to the callee */
+  } else {
+    hwloc_bitmap_free(atom_pmu_set);
+  }
+  if (core_pmu_set) {
+    struct hwloc_info_s infoattr;
+    infoattr.name = (char *) "CoreType";
+    infoattr.value = (char *) "IntelCore";
+    hwloc_internal_cpukinds_register(topology, core_pmu_set, HWLOC_CPUKIND_EFFICIENCY_UNKNOWN, &infoattr, 1, 0);
+    /* the cpuset is given to the callee */
+  } else {
+    hwloc_bitmap_free(core_pmu_set);
+  }
+
   return 0;
 }