perf kvm: Move arch specific code into arch/

Parts of a 'perf kvm stat' code make sense only for x86.

Let's move this code into the arch/x86/kvm-stat.c file and add
util/kvm-stat.h for generic structure definitions.

Add a global array 'kvm_reg_events_ops' for accessing the arch-specific
'kvm_events_ops' from generic code.

Since the several global arrays (i.e. 'kvm_events_tp') have been moved
to arch/*, we can not know their sizes and use them directly in
builtin-kvm.c. This patch fixes that problem by adding trimming NULL
element to each array and changing the behavior of their handlers in
generic code.

Reviewed-by: David Ahern <dsahern@gmail.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1404397747-20939-3-git-send-email-yarygin@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 151 insertions, 0 deletions

diff --git a/tools/perf/arch/x86/util/kvm-stat.c b/tools/perf/arch/x86/util/kvm-stat.c
new file mode 100644
index 000000000000..2f8d2c1af5ca
--- /dev/null
+++ b/tools/perf/arch/x86/util/kvm-stat.c
@@ -0,0 +1,151 @@
+#include "../../util/kvm-stat.h"
+#include <asm/kvm_perf.h>
+
+define_exit_reasons_table(vmx_exit_reasons, VMX_EXIT_REASONS);
+define_exit_reasons_table(svm_exit_reasons, SVM_EXIT_REASONS);
+
+static struct kvm_events_ops exit_events = {
+        .is_begin_event = exit_event_begin,
+        .is_end_event = exit_event_end,
+        .decode_key = exit_event_decode_key,
+        .name = "VM-EXIT"
+};
+
+/*
+ * For the mmio events, we treat:
+ * the time of MMIO write: kvm_mmio(KVM_TRACE_MMIO_WRITE...) -> kvm_entry
+ * the time of MMIO read: kvm_exit -> kvm_mmio(KVM_TRACE_MMIO_READ...).
+ */
+static void mmio_event_get_key(struct perf_evsel *evsel, struct perf_sample *sample,
+                               struct event_key *key)
+{
+        key->key  = perf_evsel__intval(evsel, sample, "gpa");
+        key->info = perf_evsel__intval(evsel, sample, "type");
+}
+
+#define KVM_TRACE_MMIO_READ_UNSATISFIED 0
+#define KVM_TRACE_MMIO_READ 1
+#define KVM_TRACE_MMIO_WRITE 2
+
+static bool mmio_event_begin(struct perf_evsel *evsel,
+                             struct perf_sample *sample, struct event_key *key)
+{
+        /* MMIO read begin event in kernel. */
+        if (kvm_exit_event(evsel))
+                return true;
+
+        /* MMIO write begin event in kernel. */
+        if (!strcmp(evsel->name, "kvm:kvm_mmio") &&
+            perf_evsel__intval(evsel, sample, "type") == KVM_TRACE_MMIO_WRITE) {
+                mmio_event_get_key(evsel, sample, key);
+                return true;
+        }
+
+        return false;
+}
+
+static bool mmio_event_end(struct perf_evsel *evsel, struct perf_sample *sample,
+                           struct event_key *key)
+{
+        /* MMIO write end event in kernel. */
+        if (kvm_entry_event(evsel))
+                return true;
+
+        /* MMIO read end event in kernel.*/
+        if (!strcmp(evsel->name, "kvm:kvm_mmio") &&
+            perf_evsel__intval(evsel, sample, "type") == KVM_TRACE_MMIO_READ) {
+                mmio_event_get_key(evsel, sample, key);
+                return true;
+        }
+
+        return false;
+}
+
+static void mmio_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
+                                  struct event_key *key,
+                                  char *decode)
+{
+        scnprintf(decode, DECODE_STR_LEN, "%#lx:%s",
+                  (unsigned long)key->key,
+                  key->info == KVM_TRACE_MMIO_WRITE ? "W" : "R");
+}
+
+static struct kvm_events_ops mmio_events = {
+        .is_begin_event = mmio_event_begin,
+        .is_end_event = mmio_event_end,
+        .decode_key = mmio_event_decode_key,
+        .name = "MMIO Access"
+};
+
+ /* The time of emulation pio access is from kvm_pio to kvm_entry. */
+static void ioport_event_get_key(struct perf_evsel *evsel,
+                                 struct perf_sample *sample,
+                                 struct event_key *key)
+{
+        key->key  = perf_evsel__intval(evsel, sample, "port");
+        key->info = perf_evsel__intval(evsel, sample, "rw");
+}
+
+static bool ioport_event_begin(struct perf_evsel *evsel,
+                               struct perf_sample *sample,
+                               struct event_key *key)
+{
+        if (!strcmp(evsel->name, "kvm:kvm_pio")) {
+                ioport_event_get_key(evsel, sample, key);
+                return true;
+        }
+
+        return false;
+}
+
+static bool ioport_event_end(struct perf_evsel *evsel,
+                             struct perf_sample *sample __maybe_unused,
+                             struct event_key *key __maybe_unused)
+{
+        return kvm_entry_event(evsel);
+}
+
+static void ioport_event_decode_key(struct perf_kvm_stat *kvm __maybe_unused,
+                                    struct event_key *key,
+                                    char *decode)
+{
+        scnprintf(decode, DECODE_STR_LEN, "%#llx:%s",
+                  (unsigned long long)key->key,
+                  key->info ? "POUT" : "PIN");
+}
+
+static struct kvm_events_ops ioport_events = {
+        .is_begin_event = ioport_event_begin,
+        .is_end_event = ioport_event_end,
+        .decode_key = ioport_event_decode_key,
+        .name = "IO Port Access"
+};
+
+const char * const kvm_events_tp[] = {
+        "kvm:kvm_entry",
+        "kvm:kvm_exit",
+        "kvm:kvm_mmio",
+        "kvm:kvm_pio",
+        NULL,
+};
+
+struct kvm_reg_events_ops kvm_reg_events_ops[] = {
+        { .name = "vmexit", .ops = &exit_events },
+        { .name = "mmio", .ops = &mmio_events },
+        { .name = "ioport", .ops = &ioport_events },
+        { NULL, NULL },
+};
+
+int cpu_isa_init(struct perf_kvm_stat *kvm, const char *cpuid)
+{
+        if (strstr(cpuid, "Intel")) {
+                kvm->exit_reasons = vmx_exit_reasons;
+                kvm->exit_reasons_isa = "VMX";
+        } else if (strstr(cpuid, "AMD")) {
+                kvm->exit_reasons = svm_exit_reasons;
+                kvm->exit_reasons_isa = "SVM";
+        } else
+                return -ENOTSUP;
+
+        return 0;
+}