Re: [PATCH 5/6] perf_counter: powerpc: Add processor back-end for MPC7450 family

From: Kumar Gala
Date: Wed Jun 17 2009 - 10:15:49 EST

On Jun 17, 2009, at 6:53 AM, Paul Mackerras wrote:

This adds support for the performance monitor hardware on the
MPC7450 family of processors (7450, 7451, 7455, 7447/7457, 7447A,
7448), used in the later Apple G4 powermacs/powerbooks and other
machines. These machines have 6 hardware counters with a unique
set of events which can be counted on each counter, with some
events being available on multiple counters.

Raw event codes for these processors are (PMC << 8) + PMCSEL.
If PMC is non-zero then the event is that selected by the given
PMCSEL value for that PMC (hardware counter). If PMC is zero
then the event selected is one of the low-numbered ones that are
common to several PMCs. In this case PMCSEL must be <= 22 and
the event is what that PMCSEL value would select on PMC1 (but
it may be placed any other PMC that has the same event for that
PMCSEL value).

For events that count cycles or occurrences that exceed a threshold,
the threshold requested can be specified in the 0x3f000 bits of the
raw event codes. If the event uses the threshold multiplier bit
and that bit should be set, that is indicated with the 0x40000 bit
of the raw event code.

This fills in some of the generic cache events. Unfortunately there
are quite a few blank spaces in the table, partly because these
processors tend to count cache hits rather than cache accesses.

Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx>
arch/powerpc/kernel/Makefile | 2 +
arch/powerpc/kernel/mpc7450-pmu.c | 417 +++++++++++++++++++++++ +++++++++
arch/powerpc/platforms/Kconfig.cputype | 1 +
3 files changed, 420 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/kernel/mpc7450-pmu.c

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/ Makefile
index c5f93f0..a9f8829 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -98,6 +98,7 @@ obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
obj-$(CONFIG_PPC_PERF_CTRS) += perf_counter.o
obj64-$(CONFIG_PPC_PERF_CTRS) += power4-pmu.o ppc970-pmu.o power5- pmu.o \
power5+-pmu.o power6-pmu.o power7-pmu.o

This should be something like:


+obj32-$(CONFIG_PPC_PERF_CTRS) += mpc7450-pmu.o


Or use new Kconfig types as I suggested on patch 1/6

obj-$(CONFIG_8XX_MINIMAL_FPEMU) += softemu8xx.o

@@ -106,6 +107,7 @@ obj-y += iomap.o

obj-$(CONFIG_PPC64) += $(obj64-y)
+obj-$(CONFIG_PPC32) += $(obj32-y)

obj-y += ppc_save_regs.o
diff --git a/arch/powerpc/kernel/mpc7450-pmu.c b/arch/pow
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