[XenPPC] [POWERPC][XEN][LINUX] Guest Perfmon implementation - enabling H_PERFMON call on platform xen

[Christian Ehrhardt <ehrhardt@xxxxxxxxxxxxxxxxxx>]

[POWERPC][XEN][LINUX] Guest Perfmon implementation - enabling H_PERFMON 
call on platform xen
->attachment

--

Grüsse / regards, 
Christian Ehrhardt
IBM Linux Technology Center, Open Virtualization
+49 7031/16-3385
Ehrhardt@xxxxxxxxxxxxxxxxxxx
Ehrhardt@xxxxxxxxxx

IBM Deutschland Entwicklung GmbH
Vorsitzender des Aufsichtsrats: Johann Weihen 
Geschäftsführung: Herbert Kircher 
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294

# HG changeset patch
# User Christian Ehrhardt <ehrhardt@xxxxxxxxxxxxxxxxxx>
# Date 1178509901 -7200
# Node ID 1cb08aff4ebef1207989e5db3f97db39d166d5a1
# Parent  04f6ad5d9232878cbcf8810025bb3ab59cbb62b6
[POWERPC][XEN][LINUX] Guest Perfmon implementation - enabling H_PERFMON call on 
platform xen
This is the first step of enabling oprofile performance monitoring on the 
xenppc platform. It allows users to work with oprofile in Dom0 and DomU guests 
as known from non virtualized ppc-linux.
This patch:
- enables the pmu with the H_PERFMON papr call on platform xen

Signed-off-by: Christian Ehrhardt <ehrhardt@xxxxxxxxxxxxxxxxxx>

diff -r 04f6ad5d9232 -r 1cb08aff4ebe arch/powerpc/platforms/xen/setup.c
--- a/arch/powerpc/platforms/xen/setup.c        Mon Mar 05 13:23:38 2007 -0600
+++ b/arch/powerpc/platforms/xen/setup.c        Mon May 07 05:51:41 2007 +0200
@@ -18,6 +18,7 @@
 #include <asm/machdep.h>
 #include <asm/hypervisor.h>
 #include <asm/time.h>
+#include <asm/pmc.h>
 #include "setup.h"
 
 #ifdef DEBUG
@@ -193,6 +194,17 @@ static void xen_power_save(void)
        HYPERVISOR_sched_op(SCHEDOP_block, NULL);
 }
 
+static void pseries_xen_enable_pmcs(void)
+{
+       unsigned long set, reset;
+
+       power4_enable_pmcs();
+
+       set = 1UL << 63;
+       reset = 0;
+       plpar_hcall_norets(H_PERFMON, set, reset);
+}
+
 void __init xen_setup_arch(void)
 {
        /* init to some ~sane value until calibrate_delay() runs */
@@ -209,6 +221,8 @@ void __init xen_setup_arch(void)
        /* let them fly */
        xen_setup_smp();
 #endif
+
+       ppc_md.enable_pmcs = pseries_xen_enable_pmcs;
 
        printk(KERN_INFO "Using Xen idle loop\n");
 }

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