perf: Adding sysfs group format attribute for pmu device

Adding sysfs group 'format' attribute for pmu device that
contains a syntax description on how to construct raw events.

The event configuration is described in following
struct pefr_event_attr attributes:

  config
  config1
  config2

Each sysfs attribute within the format attribute group,
describes mapping of name and bitfield definition within
one of above attributes.

eg:
  "/sys/...<dev>/format/event" contains "config:0-7"
  "/sys/...<dev>/format/umask" contains "config:8-15"
  "/sys/...<dev>/format/usr"   contains "config:16"

the attribute value syntax is:

  line:      config ':' bits
  config:    'config' | 'config1' | 'config2"
  bits:      bits ',' bit_term | bit_term
  bit_term:  VALUE '-' VALUE | VALUE

Adding format attribute definitions for x86 cpu pmus.

Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-vhdk5y2hyype9j63prymty36@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c
index dd002faff7a6..95e7fe1c5f0b 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -404,6 +404,21 @@ static void amd_pmu_cpu_dead(int cpu)
         }
 }
 
+PMU_FORMAT_ATTR(event,  "config:0-7,32-35");
+PMU_FORMAT_ATTR(umask,  "config:8-15"   );
+PMU_FORMAT_ATTR(edge,   "config:18"     );
+PMU_FORMAT_ATTR(inv,    "config:23"     );
+PMU_FORMAT_ATTR(cmask,  "config:24-31"  );
+
+static struct attribute *amd_format_attr[] = {
+        &format_attr_event.attr,
+        &format_attr_umask.attr,
+        &format_attr_edge.attr,
+        &format_attr_inv.attr,
+        &format_attr_cmask.attr,
+        NULL,
+};
+
 static __initconst const struct x86_pmu amd_pmu = {
         .name                   = "AMD",
         .handle_irq             = x86_pmu_handle_irq,
@@ -426,6 +441,8 @@ static __initconst const struct x86_pmu amd_pmu = {
         .get_event_constraints  = amd_get_event_constraints,
         .put_event_constraints  = amd_put_event_constraints,
 
+        .format_attrs           = amd_format_attr,
+
         .cpu_prepare            = amd_pmu_cpu_prepare,
         .cpu_starting           = amd_pmu_cpu_starting,
         .cpu_dead               = amd_pmu_cpu_dead,
@@ -596,6 +613,7 @@ static __initconst const struct x86_pmu amd_pmu_f15h = {
         .cpu_dead               = amd_pmu_cpu_dead,
 #endif
         .cpu_starting           = amd_pmu_cpu_starting,
+        .format_attrs           = amd_format_attr,
 };
 
 __init int amd_pmu_init(void)