powerpc: powernv: Implement ppc_md.get_proc_freq()

Implement a method named pnv_get_proc_freq(unsigned int cpu) which
returns the current clock rate on the 'cpu' in Hz to be reported in
/proc/cpuinfo. This method uses the value reported by cpufreq when
such a value is sane. Otherwise it falls back to old way of reporting
the clockrate, i.e. ppc_proc_freq.

Set the ppc_md.get_proc_freq() hook to pnv_get_proc_freq() on the
PowerNV platform.

Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
index 05d63aa..865aab4 100644 (file)
--- a/arch/powerpc/platforms/powernv/setup.c
+++ b/arch/powerpc/platforms/powernv/setup.c
@@ -27,6 +27,7 @@
 #include <linux/interrupt.h>
 #include <linux/bug.h>
 #include <linux/pci.h>
+#include <linux/cpufreq.h>
 
 #include <asm/machdep.h>
 #include <asm/firmware.h>
@@ -290,6 +291,25 @@ static int __init pnv_probe(void)
        return 1;
 }
 
+/*
+ * Returns the cpu frequency for 'cpu' in Hz. This is used by
+ * /proc/cpuinfo
+ */
+unsigned long pnv_get_proc_freq(unsigned int cpu)
+{
+       unsigned long ret_freq;
+
+       ret_freq = cpufreq_quick_get(cpu) * 1000ul;
+
+       /*
+        * If the backend cpufreq driver does not exist,
+         * then fallback to old way of reporting the clockrate.
+        */
+       if (!ret_freq)
+               ret_freq = ppc_proc_freq;
+       return ret_freq;
+}
+
 define_machine(powernv) {
        .name                   = "PowerNV",
        .probe                  = pnv_probe,
@@ -297,6 +317,7 @@ define_machine(powernv) {
        .setup_arch             = pnv_setup_arch,
        .init_IRQ               = pnv_init_IRQ,
        .show_cpuinfo           = pnv_show_cpuinfo,
+       .get_proc_freq          = pnv_get_proc_freq,
        .progress               = pnv_progress,
        .machine_shutdown       = pnv_shutdown,
        .power_save             = power7_idle,