perf: Fix Pentium4 raw event validation

This patch fixes some issues with raw event validation on
Pentium 4 (Netburst) based processors.

As I was testing libpfm4 Netburst support, I ran into two
problems in the p4_validate_raw_event() function:

   - the shared field must be checked ONLY when HT is on
   - the binding to ESCR register was missing

The second item was causing raw events to not be encoded
correctly compared to generic PMU events.

With this patch, I can now pass Netburst events to libpfm4
examples and get meaningful results:

  $ task -e global_power_events:running:u  noploop 1
  noploop for 1 seconds
  3,206,304,898 global_power_events:running

Signed-off-by: Stephane Eranian <eranian@google.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: peterz@infradead.org
Cc: paulus@samba.org
Cc: davem@davemloft.net
Cc: fweisbec@gmail.com
Cc: perfmon2-devel@lists.sf.net
Cc: eranian@gmail.com
Cc: robert.richter@amd.com
Cc: acme@redhat.com
Cc: gorcunov@gmail.com
Cc: ming.m.lin@intel.com
LKML-Reference: <4d3efb2f.1252d80a.1a80.ffffc83f@mx.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/arch/x86/kernel/cpu/perf_event_p4.c b/arch/x86/kernel/cpu/perf_event_p4.c
index e56b9bfbabd124ee78f2bb74c4816fafa74517f7..f7a0993c1e7c7a7a321b9057f9aaad75a75cc611 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event_p4.c
+++ b/arch/x86/kernel/cpu/perf_event_p4.c
@@ -682,7 +682,7 @@ static int p4_validate_raw_event(struct perf_event *event)
         * if an event is shared accross the logical threads
         * the user needs special permissions to be able to use it
         */
-       if (p4_event_bind_map[v].shared) {
+       if (p4_ht_active() && p4_event_bind_map[v].shared) {
                if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN))
                        return -EACCES;
        }
@@ -727,7 +727,8 @@ static int p4_hw_config(struct perf_event *event)
                event->hw.config = p4_set_ht_bit(event->hw.config);
 
        if (event->attr.type == PERF_TYPE_RAW) {
-
+               struct p4_event_bind *bind;
+               unsigned int esel;
                /*
                 * Clear bits we reserve to be managed by kernel itself
                 * and never allowed from a user space
@@ -743,6 +744,13 @@ static int p4_hw_config(struct perf_event *event)
                 * bits since we keep additional info here (for cache events and etc)
                 */
                event->hw.config |= event->attr.config;
+               bind = p4_config_get_bind(event->attr.config);
+               if (!bind) {
+                       rc = -EINVAL;
+                       goto out;
+               }
+               esel = P4_OPCODE_ESEL(bind->opcode);
+               event->hw.config |= p4_config_pack_cccr(P4_CCCR_ESEL(esel));
        }
 
        rc = x86_setup_perfctr(event);