vpmu intel: Dump vpmu infos in 'q' keyhandler

This patch extends the printout of the VPCU infos of the keyhandler 'q'.
If vPMU is enabled is on the VCPU and active lines are printed like
(when running HVM openSuSE-12.3 with 'perf top');

(XEN)     vPMU running
(XEN)       general_0: 0x000000ffffff3ae1 ctrl: 0x000000000053003c
(XEN)       fixed_1:   0x000000ff90799188 ctrl: 0xb

This means general counter 0 and fixed counter 1 are running with showing
their contents and the contents of their configuration msr.

Signed-off-by: Dietmar Hahn <dietmar.hahn@ts.fujitsu.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Jun Nakajima <jun.nakajima@intel.com>

1 files changed, 60 insertions, 3 deletions

diff --git a/xen/arch/x86/hvm/vmx/vpmu_core2.c b/xen/arch/x86/hvm/vmx/vpmu_core2.c
index f14fbee76e..2313e39f62 100644
--- a/xen/arch/x86/hvm/vmx/vpmu_core2.c
+++ b/xen/arch/x86/hvm/vmx/vpmu_core2.c
@@ -133,6 +133,16 @@ static const u32 core2_fix_counters_msr[] = {
     MSR_CORE_PERF_FIXED_CTR2
 };
 
+/*
+ * MSR_CORE_PERF_FIXED_CTR_CTRL contains the configuration of all fixed
+ * counters. 4 bits for every counter.
+ */
+#define FIXED_CTR_CTRL_BITS 4
+#define FIXED_CTR_CTRL_MASK ((1 << FIXED_CTR_CTRL_BITS) - 1)
+
+/* The index into the core2_ctrls_msr[] of this MSR used in core2_vpmu_dump() */
+#define MSR_CORE_PERF_FIXED_CTR_CTRL_IDX 0
+
 /* Core 2 Non-architectual Performance Control MSRs. */
 static const u32 core2_ctrls_msr[] = {
     MSR_CORE_PERF_FIXED_CTR_CTRL,
@@ -508,7 +518,7 @@ static int core2_vpmu_do_wrmsr(unsigned int msr, uint64_t msr_content)
         {
             core2_vpmu_cxt->pmu_enable->fixed_ctr_enable[i] =
                 (global_ctrl & 1) & ((non_global_ctrl & 0x3)? 1: 0);
-            non_global_ctrl >>= 4;
+            non_global_ctrl >>= FIXED_CTR_CTRL_BITS;
             global_ctrl >>= 1;
         }
         break;
@@ -565,7 +575,7 @@ static int core2_vpmu_do_wrmsr(unsigned int msr, uint64_t msr_content)
             if  ( msr == MSR_IA32_DS_AREA )
                 break;
             /* 4 bits per counter, currently 3 fixed counters implemented. */
-            mask = ~((1ull << (3 * 4)) - 1);
+            mask = ~((1ull << (VPMU_CORE2_NUM_FIXED * FIXED_CTR_CTRL_BITS)) - 1);
             if (msr_content & mask)
                 inject_gp = 1;
             break;
@@ -645,6 +655,52 @@ static void core2_vpmu_do_cpuid(unsigned int input,
     }
 }
 
+/* Dump vpmu info on console, called in the context of keyhandler 'q'. */
+static void core2_vpmu_dump(struct vcpu *v)
+{
+    struct vpmu_struct *vpmu = vcpu_vpmu(v);
+    int i, num;
+    struct core2_vpmu_context *core2_vpmu_cxt = NULL;
+    u64 val;
+
+    if ( !vpmu_is_set(vpmu, VPMU_CONTEXT_ALLOCATED) )
+         return;
+
+    if ( !vpmu_is_set(vpmu, VPMU_RUNNING) )
+    {
+        if ( vpmu_set(vpmu, VPMU_CONTEXT_LOADED) )
+            printk("    vPMU loaded\n");
+        else
+            printk("    vPMU allocated\n");
+        return;
+    }
+
+    printk("    vPMU running\n");
+    core2_vpmu_cxt = vpmu->context;
+    num = core2_get_pmc_count();
+    /* Print the contents of the counter and its configuration msr. */
+    for ( i = 0; i < num; i++ )
+    {
+        struct arch_msr_pair* msr_pair = core2_vpmu_cxt->arch_msr_pair;
+        if ( core2_vpmu_cxt->pmu_enable->arch_pmc_enable[i] )
+            printk("      general_%d: 0x%016lx ctrl: 0x%016lx\n",
+                             i, msr_pair[i].counter, msr_pair[i].control);
+    }
+    /*
+     * The configuration of the fixed counter is 4 bits each in the
+     * MSR_CORE_PERF_FIXED_CTR_CTRL.
+     */
+    val = core2_vpmu_cxt->ctrls[MSR_CORE_PERF_FIXED_CTR_CTRL_IDX];
+    for ( i = 0; i < core2_fix_counters.num; i++ )
+    {
+        if ( core2_vpmu_cxt->pmu_enable->fixed_ctr_enable[i] )
+            printk("      fixed_%d:   0x%016lx ctrl: 0x%lx\n",
+                             i, core2_vpmu_cxt->fix_counters[i],
+                             val & FIXED_CTR_CTRL_MASK);
+        val >>= FIXED_CTR_CTRL_BITS;
+    }
+}
+
 static int core2_vpmu_do_interrupt(struct cpu_user_regs *regs)
 {
     struct vcpu *v = current;
@@ -758,7 +814,8 @@ struct arch_vpmu_ops core2_vpmu_ops = {
     .do_cpuid = core2_vpmu_do_cpuid,
     .arch_vpmu_destroy = core2_vpmu_destroy,
     .arch_vpmu_save = core2_vpmu_save,
-    .arch_vpmu_load = core2_vpmu_load
+    .arch_vpmu_load = core2_vpmu_load,
+    .arch_vpmu_dump = core2_vpmu_dump
 };
 
 static void core2_no_vpmu_do_cpuid(unsigned int input,