@@ -458,29 +458,52 @@ static bool match_smt(struct cpuinfo_x86
return false;
}
+static bool match_die(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
+{
+ if (c->phys_proc_id == o->phys_proc_id &&
+ c->cpu_die_id == o->cpu_die_id)
+ return true;
+ return false;
+}
+
/*
- * Define snc_cpu[] for SNC (Sub-NUMA Cluster) CPUs.
+ * Unlike the other levels, we do not enforce keeping a
+ * multicore group inside a NUMA node. If this happens, we will
+ * discard the MC level of the topology later.
+ */
+static bool match_pkg(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
+{
+ if (c->phys_proc_id == o->phys_proc_id)
+ return true;
+ return false;
+}
+
+/*
+ * Define intel_cod_cpu[] for Intel COD (Cluster-on-Die) CPUs.
*
- * These are Intel CPUs that enumerate an LLC that is shared by
- * multiple NUMA nodes. The LLC on these systems is shared for
- * off-package data access but private to the NUMA node (half
- * of the package) for on-package access.
+ * Any Intel CPU that has multiple nodes per package and does not
+ * match intel_cod_cpu[] has the SNC (Sub-NUMA Cluster) topology.
*
- * CPUID (the source of the information about the LLC) can only
- * enumerate the cache as being shared *or* unshared, but not
- * this particular configuration. The CPU in this case enumerates
- * the cache to be shared across the entire package (spanning both
- * NUMA nodes).
+ * When in SNC mode, these CPUs enumerate an LLC that is shared
+ * by multiple NUMA nodes. The LLC is shared for off-package data
+ * access but private to the NUMA node (half of the package) for
+ * on-package access. CPUID (the source of the information about
+ * the LLC) can only enumerate the cache as shared or unshared,
+ * but not this particular configuration.
*/
-static const struct x86_cpu_id snc_cpu[] = {
- X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, NULL),
+static const struct x86_cpu_id intel_cod_cpu[] = {
+ X86_MATCH_INTEL_FAM6_MODEL(HASWELL_X, 0), /* COD */
+ X86_MATCH_INTEL_FAM6_MODEL(BROADWELL_X, 0), /* COD */
+ X86_MATCH_INTEL_FAM6_MODEL(ANY, 1), /* SNC */
{}
};
static bool match_llc(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
{
+ const struct x86_cpu_id *id = x86_match_cpu(intel_cod_cpu);
int cpu1 = c->cpu_index, cpu2 = o->cpu_index;
+ bool intel_snc = id && id->driver_data;
/* Do not match if we do not have a valid APICID for cpu: */
if (per_cpu(cpu_llc_id, cpu1) == BAD_APICID)
@@ -495,32 +518,12 @@ static bool match_llc(struct cpuinfo_x86
* means 'c' does not share the LLC of 'o'. This will be
* reflected to userspace.
*/
- if (!topology_same_node(c, o) && x86_match_cpu(snc_cpu))
+ if (match_pkg(c, o) && !topology_same_node(c, o) && intel_snc)
return false;
return topology_sane(c, o, "llc");
}
-/*
- * Unlike the other levels, we do not enforce keeping a
- * multicore group inside a NUMA node. If this happens, we will
- * discard the MC level of the topology later.
- */
-static bool match_pkg(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
-{
- if (c->phys_proc_id == o->phys_proc_id)
- return true;
- return false;
-}
-
-static bool match_die(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
-{
- if ((c->phys_proc_id == o->phys_proc_id) &&
- (c->cpu_die_id == o->cpu_die_id))
- return true;
- return false;
-}
-
#if defined(CONFIG_SCHED_SMT) || defined(CONFIG_SCHED_MC)
static inline int x86_sched_itmt_flags(void)
@@ -592,14 +595,23 @@ void set_cpu_sibling_map(int cpu)
for_each_cpu(i, cpu_sibling_setup_mask) {
o = &cpu_data(i);
+ if (match_pkg(c, o) && !topology_same_node(c, o))
+ x86_has_numa_in_package = true;
+
if ((i == cpu) || (has_smt && match_smt(c, o)))
link_mask(topology_sibling_cpumask, cpu, i);
if ((i == cpu) || (has_mp && match_llc(c, o)))
link_mask(cpu_llc_shared_mask, cpu, i);
+ if ((i == cpu) || (has_mp && match_die(c, o)))
+ link_mask(topology_die_cpumask, cpu, i);
}
+ threads = cpumask_weight(topology_sibling_cpumask(cpu));
+ if (threads > __max_smt_threads)
+ __max_smt_threads = threads;
+
/*
* This needs a separate iteration over the cpus because we rely on all
* topology_sibling_cpumask links to be set-up.
@@ -613,8 +625,7 @@ void set_cpu_sibling_map(int cpu)
/*
* Does this new cpu bringup a new core?
*/
- if (cpumask_weight(
- topology_sibling_cpumask(cpu)) == 1) {
+ if (threads == 1) {
/*
* for each core in package, increment
* the booted_cores for this new cpu
@@ -631,16 +642,7 @@ void set_cpu_sibling_map(int cpu)
} else if (i != cpu && !c->booted_cores)
c->booted_cores = cpu_data(i).booted_cores;
}
- if (match_pkg(c, o) && !topology_same_node(c, o))
- x86_has_numa_in_package = true;
-
- if ((i == cpu) || (has_mp && match_die(c, o)))
- link_mask(topology_die_cpumask, cpu, i);
}
-
- threads = cpumask_weight(topology_sibling_cpumask(cpu));
- if (threads > __max_smt_threads)
- __max_smt_threads = threads;
}
/* maps the cpu to the sched domain representing multi-core */