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>

7 files changed, 48 insertions, 52 deletions

diff --git a/arch/powerpc/include/asm/perf_counter.h b/arch/powerpc/include/asm/perf_counter.h
index 56d66c38143b..ceea76a48e3d 100644
--- a/arch/powerpc/include/asm/perf_counter.h
+++ b/arch/powerpc/include/asm/perf_counter.h
@@ -23,13 +23,13 @@ struct power_pmu {
         int     max_alternatives;
         u64     add_fields;
         u64     test_adder;
-        int     (*compute_mmcr)(unsigned int events[], int n_ev,
+        int     (*compute_mmcr)(u64 events[], int n_ev,
                                 unsigned int hwc[], u64 mmcr[]);
-        int     (*get_constraint)(unsigned int event, u64 *mskp, u64 *valp);
-        int     (*get_alternatives)(unsigned int event, unsigned int flags,
-                                    unsigned int alt[]);
+        int     (*get_constraint)(u64 event, u64 *mskp, u64 *valp);
+        int     (*get_alternatives)(u64 event, unsigned int flags,
+                                    u64 alt[]);
         void    (*disable_pmc)(unsigned int pmc, u64 mmcr[]);
-        int     (*limited_pmc_event)(unsigned int event);
+        int     (*limited_pmc_event)(u64 event);
         int     limited_pmc5_6; /* PMC5 and PMC6 have limited function */
         int     n_generic;
         int     *generic_events;
diff --git a/arch/powerpc/kernel/perf_counter.c b/arch/powerpc/kernel/perf_counter.c
index db8d5cafc159..8d4cafc84b82 100644
--- a/arch/powerpc/kernel/perf_counter.c
+++ b/arch/powerpc/kernel/perf_counter.c
@@ -26,7 +26,7 @@ struct cpu_hw_counters {
         int n_limited;
         u8  pmcs_enabled;
         struct perf_counter *counter[MAX_HWCOUNTERS];
-        unsigned int events[MAX_HWCOUNTERS];
+        u64 events[MAX_HWCOUNTERS];
         unsigned int flags[MAX_HWCOUNTERS];
         u64 mmcr[3];
         struct perf_counter *limited_counter[MAX_LIMITED_HWCOUNTERS];
@@ -131,11 +131,11 @@ static void write_pmc(int idx, unsigned long val)
  * and see if any combination of alternative codes is feasible.
  * The feasible set is returned in event[].
  */
-static int power_check_constraints(unsigned int event[], unsigned int cflags[],
+static int power_check_constraints(u64 event[], unsigned int cflags[],
                                    int n_ev)
 {
         u64 mask, value, nv;
-        unsigned int alternatives[MAX_HWCOUNTERS][MAX_EVENT_ALTERNATIVES];
+        u64 alternatives[MAX_HWCOUNTERS][MAX_EVENT_ALTERNATIVES];
         u64 amasks[MAX_HWCOUNTERS][MAX_EVENT_ALTERNATIVES];
         u64 avalues[MAX_HWCOUNTERS][MAX_EVENT_ALTERNATIVES];
         u64 smasks[MAX_HWCOUNTERS], svalues[MAX_HWCOUNTERS];
@@ -564,7 +564,7 @@ void hw_perf_enable(void)
 }
 
 static int collect_events(struct perf_counter *group, int max_count,
-                          struct perf_counter *ctrs[], unsigned int *events,
+                          struct perf_counter *ctrs[], u64 *events,
                           unsigned int *flags)
 {
         int n = 0;
@@ -752,11 +752,11 @@ struct pmu power_pmu = {
  * that a limited PMC can count, doesn't require interrupts, and
  * doesn't exclude any processor mode.
  */
-static int can_go_on_limited_pmc(struct perf_counter *counter, unsigned int ev,
+static int can_go_on_limited_pmc(struct perf_counter *counter, u64 ev,
                                  unsigned int flags)
 {
         int n;
-        unsigned int alt[MAX_EVENT_ALTERNATIVES];
+        u64 alt[MAX_EVENT_ALTERNATIVES];
 
         if (counter->hw_event.exclude_user
             || counter->hw_event.exclude_kernel
@@ -776,10 +776,8 @@ static int can_go_on_limited_pmc(struct perf_counter *counter, unsigned int ev,
 
         flags |= PPMU_LIMITED_PMC_OK | PPMU_LIMITED_PMC_REQD;
         n = ppmu->get_alternatives(ev, flags, alt);
-        if (n)
-                return alt[0];
 
-        return 0;
+        return n > 0;
 }
 
 /*
@@ -787,10 +785,9 @@ static int can_go_on_limited_pmc(struct perf_counter *counter, unsigned int ev,
  * and return the event code, or 0 if there is no such alternative.
  * (Note: event code 0 is "don't count" on all machines.)
  */
-static unsigned long normal_pmc_alternative(unsigned long ev,
-                                            unsigned long flags)
+static u64 normal_pmc_alternative(u64 ev, unsigned long flags)
 {
-        unsigned int alt[MAX_EVENT_ALTERNATIVES];
+        u64 alt[MAX_EVENT_ALTERNATIVES];
         int n;
 
         flags &= ~(PPMU_LIMITED_PMC_OK | PPMU_LIMITED_PMC_REQD);
@@ -820,9 +817,10 @@ static void hw_perf_counter_destroy(struct perf_counter *counter)
 
 const struct pmu *hw_perf_counter_init(struct perf_counter *counter)
 {
-        unsigned long ev, flags;
+        u64 ev;
+        unsigned long flags;
         struct perf_counter *ctrs[MAX_HWCOUNTERS];
-        unsigned int events[MAX_HWCOUNTERS];
+        u64 events[MAX_HWCOUNTERS];
         unsigned int cflags[MAX_HWCOUNTERS];
         int n;
         int err;
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;
diff --git a/arch/powerpc/kernel/power5+-pmu.c b/arch/powerpc/kernel/power5+-pmu.c
index 8154eaa2404f..3ac0654372ab 100644
--- a/arch/powerpc/kernel/power5+-pmu.c
+++ b/arch/powerpc/kernel/power5+-pmu.c
@@ -135,7 +135,7 @@ static u64 unit_cons[PM_LASTUNIT+1][2] = {
         [PM_GRS] =   { 0x0e00000000ull, 0x0c40000000ull },
 };
 
-static int power5p_get_constraint(unsigned int event, u64 *maskp, u64 *valp)
+static int power5p_get_constraint(u64 event, u64 *maskp, u64 *valp)
 {
         int pmc, byte, unit, sh;
         int bit, fmask;
@@ -188,7 +188,7 @@ static int power5p_get_constraint(unsigned int event, u64 *maskp, u64 *valp)
         return 0;
 }
 
-static int power5p_limited_pmc_event(unsigned int event)
+static int power5p_limited_pmc_event(u64 event)
 {
         int pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 
@@ -273,11 +273,11 @@ static int find_alternative_bdecode(unsigned int event)
         return -1;
 }
 
-static int power5p_get_alternatives(unsigned int event, unsigned int flags,
-                                    unsigned int alt[])
+static int power5p_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 {
-        int i, j, ae, nalt = 1;
+        int i, j, nalt = 1;
         int nlim;
+        u64 ae;
 
         alt[0] = event;
         nalt = 1;
@@ -402,7 +402,7 @@ static unsigned char direct_event_is_marked[0x28] = {
  * 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 power5p_marked_instr_event(unsigned int event)
+static int power5p_marked_instr_event(u64 event)
 {
         int pmc, psel;
         int bit, byte, unit;
@@ -451,7 +451,7 @@ static int power5p_marked_instr_event(unsigned int event)
         return (mask >> (byte * 8 + bit)) & 1;
 }
 
-static int power5p_compute_mmcr(unsigned int event[], int n_ev,
+static int power5p_compute_mmcr(u64 event[], int n_ev,
                                 unsigned int hwc[], u64 mmcr[])
 {
         u64 mmcr1 = 0;
diff --git a/arch/powerpc/kernel/power5-pmu.c b/arch/powerpc/kernel/power5-pmu.c
index 6e667dc86470..d5344968ee9c 100644
--- a/arch/powerpc/kernel/power5-pmu.c
+++ b/arch/powerpc/kernel/power5-pmu.c
@@ -139,7 +139,7 @@ static u64 unit_cons[PM_LASTUNIT+1][2] = {
         [PM_GRS] =   { 0x30002000000000ull, 0x30000400000000ull },
 };
 
-static int power5_get_constraint(unsigned int event, u64 *maskp, u64 *valp)
+static int power5_get_constraint(u64 event, u64 *maskp, u64 *valp)
 {
         int pmc, byte, unit, sh;
         int bit, fmask;
@@ -224,7 +224,7 @@ static const unsigned int event_alternatives[][MAX_ALT] = {
  * Scan the alternatives table for a match and return the
  * index into the alternatives table if found, else -1.
  */
-static int find_alternative(unsigned int event)
+static int find_alternative(u64 event)
 {
         int i, j;
 
@@ -250,7 +250,7 @@ static const unsigned char bytedecode_alternatives[4][4] = {
  * PMCSEL values on other counters.  This returns the alternative
  * event code for those that do, or -1 otherwise.
  */
-static int find_alternative_bdecode(unsigned int event)
+static u64 find_alternative_bdecode(u64 event)
 {
         int pmc, altpmc, pp, j;
 
@@ -269,10 +269,10 @@ static int find_alternative_bdecode(unsigned int event)
         return -1;
 }
 
-static int power5_get_alternatives(unsigned int event, unsigned int flags,
-                                   unsigned int alt[])
+static int power5_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 {
-        int i, j, ae, nalt = 1;
+        int i, j, nalt = 1;
+        u64 ae;
 
         alt[0] = event;
         nalt = 1;
@@ -338,7 +338,7 @@ static unsigned char direct_event_is_marked[0x28] = {
  * 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 power5_marked_instr_event(unsigned int event)
+static int power5_marked_instr_event(u64 event)
 {
         int pmc, psel;
         int bit, byte, unit;
@@ -382,7 +382,7 @@ static int power5_marked_instr_event(unsigned int event)
         return (mask >> (byte * 8 + bit)) & 1;
 }
 
-static int power5_compute_mmcr(unsigned int event[], int n_ev,
+static int power5_compute_mmcr(u64 event[], int n_ev,
                                unsigned int hwc[], u64 mmcr[])
 {
         u64 mmcr1 = 0;
diff --git a/arch/powerpc/kernel/power6-pmu.c b/arch/powerpc/kernel/power6-pmu.c
index d44049f0ae27..ab7c615c458d 100644
--- a/arch/powerpc/kernel/power6-pmu.c
+++ b/arch/powerpc/kernel/power6-pmu.c
@@ -134,7 +134,7 @@ static u32 marked_bus_events[16] = {
  * 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 power6_marked_instr_event(unsigned int event)
+static int power6_marked_instr_event(u64 event)
 {
         int pmc, psel, ptype;
         int bit, byte, unit;
@@ -172,7 +172,7 @@ static int power6_marked_instr_event(unsigned int event)
 /*
  * Assign PMC numbers and compute MMCR1 value for a set of events
  */
-static int p6_compute_mmcr(unsigned int event[], int n_ev,
+static int p6_compute_mmcr(u64 event[], int n_ev,
                            unsigned int hwc[], u64 mmcr[])
 {
         u64 mmcr1 = 0;
@@ -265,7 +265,7 @@ static int p6_compute_mmcr(unsigned int event[], int n_ev,
  *      20-23, 24-27, 28-31 ditto for bytes 1, 2, 3
  *      32-34   select field: nest (subunit) event selector
  */
-static int p6_get_constraint(unsigned int event, u64 *maskp, u64 *valp)
+static int p6_get_constraint(u64 event, u64 *maskp, u64 *valp)
 {
         int pmc, byte, sh, subunit;
         u64 mask = 0, value = 0;
@@ -298,7 +298,7 @@ static int p6_get_constraint(unsigned int event, u64 *maskp, u64 *valp)
         return 0;
 }
 
-static int p6_limited_pmc_event(unsigned int event)
+static int p6_limited_pmc_event(u64 event)
 {
         int pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
 
@@ -337,7 +337,7 @@ static const unsigned int event_alternatives[][MAX_ALT] = {
  * This could be made more efficient with a binary search on
  * a presorted list, if necessary
  */
-static int find_alternatives_list(unsigned int event)
+static int find_alternatives_list(u64 event)
 {
         int i, j;
         unsigned int alt;
@@ -356,12 +356,12 @@ static int find_alternatives_list(unsigned int event)
         return -1;
 }
 
-static int p6_get_alternatives(unsigned int event, unsigned int flags,
-                               unsigned int alt[])
+static int p6_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 {
         int i, j, nlim;
-        unsigned int aevent, psel, pmc;
+        unsigned int psel, pmc;
         unsigned int nalt = 1;
+        u64 aevent;
 
         alt[0] = event;
         nlim = p6_limited_pmc_event(event);
diff --git a/arch/powerpc/kernel/ppc970-pmu.c b/arch/powerpc/kernel/ppc970-pmu.c
index af2d1884058c..eed47c4523f1 100644
--- a/arch/powerpc/kernel/ppc970-pmu.c
+++ b/arch/powerpc/kernel/ppc970-pmu.c
@@ -147,7 +147,7 @@ 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 p970_marked_instr_event(unsigned int event)
+static int p970_marked_instr_event(u64 event)
 {
         int pmc, psel, unit, byte, bit;
         unsigned int mask;
@@ -192,7 +192,7 @@ static u64 unit_cons[PM_LASTUNIT+1][2] = {
         [PM_STS] =   { 0x380000000000ull, 0x310000000000ull },
 };
 
-static int p970_get_constraint(unsigned int event, u64 *maskp, u64 *valp)
+static int p970_get_constraint(u64 event, u64 *maskp, u64 *valp)
 {
         int pmc, byte, unit, sh, spcsel;
         u64 mask = 0, value = 0;
@@ -243,8 +243,7 @@ static int p970_get_constraint(unsigned int event, u64 *maskp, u64 *valp)
         return 0;
 }
 
-static int p970_get_alternatives(unsigned int event, unsigned int flags,
-                                 unsigned int alt[])
+static int p970_get_alternatives(u64 event, unsigned int flags, u64 alt[])
 {
         alt[0] = event;
 
@@ -257,7 +256,7 @@ static int p970_get_alternatives(unsigned int event, unsigned int flags,
         return 1;
 }
 
-static int p970_compute_mmcr(unsigned int event[], int n_ev,
+static int p970_compute_mmcr(u64 event[], int n_ev,
                              unsigned int hwc[], u64 mmcr[])
 {
         u64 mmcr0 = 0, mmcr1 = 0, mmcra = 0;