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authorMichael Ellerman <michael@ellerman.id.au>2012-10-30 16:09:56 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-11-15 13:00:36 +1100
commitda111957796515755d95ec6773dc714350724a4e (patch)
tree4854509b69457adb40f1a82fb853920208c99238 /arch/powerpc/perf
parentbb29b719372742939af05457aff1b59608764e89 (diff)
downloadlinaro-lsk-da111957796515755d95ec6773dc714350724a4e.tar.gz
powerpc/perf: Add missing L2 constraint handling in Power7 PMU
If we have two cache events that require different settings of the L2SEL bits in MMCR1 then we can not schedule those events simultaneously. Add logic to the constraint handling to express that. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/perf')
-rw-r--r--arch/powerpc/perf/power7-pmu.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/arch/powerpc/perf/power7-pmu.c b/arch/powerpc/perf/power7-pmu.c
index 441af08edf4..2ee01e38d5e 100644
--- a/arch/powerpc/perf/power7-pmu.c
+++ b/arch/powerpc/perf/power7-pmu.c
@@ -54,8 +54,10 @@
* Layout of constraint bits:
* 6666555555555544444444443333333333222222222211111111110000000000
* 3210987654321098765432109876543210987654321098765432109876543210
- * [ ><><><><><><>
- * NC P6P5P4P3P2P1
+ * < >< ><><><><><><>
+ * L2 NC P6P5P4P3P2P1
+ *
+ * L2 - 16-18 - Required L2SEL value (select field)
*
* NC - number of counters
* 15: NC error 0x8000
@@ -72,7 +74,7 @@
static int power7_get_constraint(u64 event, unsigned long *maskp,
unsigned long *valp)
{
- int pmc, sh;
+ int pmc, sh, unit;
unsigned long mask = 0, value = 0;
pmc = (event >> PM_PMC_SH) & PM_PMC_MSK;
@@ -90,6 +92,15 @@ static int power7_get_constraint(u64 event, unsigned long *maskp,
mask |= 0x8000;
value |= 0x1000;
}
+
+ unit = (event >> PM_UNIT_SH) & PM_UNIT_MSK;
+ if (unit == 6) {
+ /* L2SEL must be identical across events */
+ int l2sel = (event >> PM_L2SEL_SH) & PM_L2SEL_MSK;
+ mask |= 0x7 << 16;
+ value |= l2sel << 16;
+ }
+
*maskp = mask;
*valp = value;
return 0;