From: Michael Ellerman Date: Tue, 30 Oct 2012 16:09:56 +0000 (+0000) Subject: powerpc/perf: Add missing L2 constraint handling in Power7 PMU X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=da111957796515755d95ec6773dc714350724a4e;p=openwrt%2Fstaging%2Fblogic.git 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 Acked-by: Paul Mackerras Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/perf/power7-pmu.c b/arch/powerpc/perf/power7-pmu.c index 441af08edf43..2ee01e38d5e2 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;