1 files changed, 39 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 2346c95c6ab1..1cd4a1a44b95 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -646,6 +646,30 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
                 c->x86_capability[10] = eax;
         }
 
+        /* Additional Intel-defined flags: level 0x0000000F */
+        if (c->cpuid_level >= 0x0000000F) {
+                u32 eax, ebx, ecx, edx;
+
+                /* QoS sub-leaf, EAX=0Fh, ECX=0 */
+                cpuid_count(0x0000000F, 0, &eax, &ebx, &ecx, &edx);
+                c->x86_capability[11] = edx;
+                if (cpu_has(c, X86_FEATURE_CQM_LLC)) {
+                        /* will be overridden if occupancy monitoring exists */
+                        c->x86_cache_max_rmid = ebx;
+
+                        /* QoS sub-leaf, EAX=0Fh, ECX=1 */
+                        cpuid_count(0x0000000F, 1, &eax, &ebx, &ecx, &edx);
+                        c->x86_capability[12] = edx;
+                        if (cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC)) {
+                                c->x86_cache_max_rmid = ecx;
+                                c->x86_cache_occ_scale = ebx;
+                        }
+                } else {
+                        c->x86_cache_max_rmid = -1;
+                        c->x86_cache_occ_scale = -1;
+                }
+        }
+
         /* AMD-defined flags: level 0x80000001 */
         xlvl = cpuid_eax(0x80000000);
         c->extended_cpuid_level = xlvl;
@@ -834,6 +858,20 @@ static void generic_identify(struct cpuinfo_x86 *c)
         detect_nopl(c);
 }
 
+static void x86_init_cache_qos(struct cpuinfo_x86 *c)
+{
+        /*
+         * The heavy lifting of max_rmid and cache_occ_scale are handled
+         * in get_cpu_cap().  Here we just set the max_rmid for the boot_cpu
+         * in case CQM bits really aren't there in this CPU.
+         */
+        if (c != &boot_cpu_data) {
+                boot_cpu_data.x86_cache_max_rmid =
+                        min(boot_cpu_data.x86_cache_max_rmid,
+                            c->x86_cache_max_rmid);
+        }
+}
+
 /*
  * This does the hard work of actually picking apart the CPU stuff...
  */
@@ -923,6 +961,7 @@ static void identify_cpu(struct cpuinfo_x86 *c)
 
         init_hypervisor(c);
         x86_init_rdrand(c);
+        x86_init_cache_qos(c);
 
         /*
          * Clear/Set all flags overriden by options, need do it