perf_counter: powerpc: use u64 for event codes internally

Although the perf_counter API allows 63-bit raw event codes,
internally in the powerpc back-end we had been using 32-bit
event codes.  This expands them to 64 bits so that we can add
bits for specifying threshold start/stop events and instruction
sampling modes later.

This also corrects the return value of can_go_on_limited_pmc;
we were returning an event code rather than just a 0/1 value in
some circumstances. That didn't particularly matter while event
codes were 32-bit, but now that event codes are 64-bit it
might, so this fixes it.

[ Impact: extend PowerPC perfcounter interfaces from u32 to u64 ]

Signed-off-by: Paul Mackerras <paulus@samba.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <18955.36874.472452.353104@drongo.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 5 deletions

diff --git a/arch/powerpc/kernel/power4-pmu.c b/arch/powerpc/kernel/power4-pmu.c
index 744a2756958e..836fa118eb1e 100644
--- a/arch/powerpc/kernel/power4-pmu.c
+++ b/arch/powerpc/kernel/power4-pmu.c
@@ -213,7 +213,7 @@ static unsigned char direct_marked_event[8] = {
  * Returns 1 if event counts things relating to marked instructions
  * and thus needs the MMCRA_SAMPLE_ENABLE bit set, or 0 if not.
  */
-static int p4_marked_instr_event(unsigned int event)
+static int p4_marked_instr_event(u64 event)
 {
         int pmc, psel, unit, byte, bit;
         unsigned int mask;
@@ -249,7 +249,7 @@ static int p4_marked_instr_event(unsigned int event)
         return (mask >> (byte * 8 + bit)) & 1;
 }
 
-static int p4_get_constraint(unsigned int event, u64 *maskp, u64 *valp)
+static int p4_get_constraint(u64 event, u64 *maskp, u64 *valp)
 {
         int pmc, byte, unit, lower, sh;
         u64 mask = 0, value = 0;
@@ -320,8 +320,7 @@ static unsigned int ppc_inst_cmpl[] = {
         0x1001, 0x4001, 0x6001, 0x7001, 0x8001
 };
 
-static int p4_get_alternatives(unsigned int event, unsigned int flags,
-                               unsigned int alt[])
+static int p4_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 {
         int i, j, na;
 
@@ -353,7 +352,7 @@ static int p4_get_alternatives(unsigned int event, unsigned int flags,
         return na;
 }
 
-static int p4_compute_mmcr(unsigned int event[], int n_ev,
+static int p4_compute_mmcr(u64 event[], int n_ev,
                            unsigned int hwc[], u64 mmcr[])
 {
         u64 mmcr0 = 0, mmcr1 = 0, mmcra = 0;