powerpc: powernv: Framework to show the correct clock in /proc/cpuinfo

Currently, the code in setup-common.c for powerpc assumes that all
clock rates are same in a smp system. This value is cached in the
variable named ppc_proc_freq and is the value that is reported in
/proc/cpuinfo.

However on the PowerNV platform, the clock rate is same only across
the threads of the same core. Hence the value that is reported in
/proc/cpuinfo is incorrect on PowerNV platforms. We need a better way
to query and report the correct value of the processor clock in
/proc/cpuinfo.

The patch achieves this by creating a machdep_call named
get_proc_freq() which is expected to returns the frequency in Hz. The
code in show_cpuinfo() can invoke this method to display the correct
clock rate on platforms that have implemented this method. On the
other powerpc platforms it can use the value cached in ppc_proc_freq.

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/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index 240b137..374abc2 100644 (file)
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -113,6 +113,8 @@ struct machdep_calls {
        /* Optional, may be NULL. */
        void            (*show_cpuinfo)(struct seq_file *m);
        void            (*show_percpuinfo)(struct seq_file *m, int i);
+       /* Returns the current operating frequency of "cpu" in Hz */
+       unsigned long   (*get_proc_freq)(unsigned int cpu);
 
        void            (*init_IRQ)(void);
 

diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 79b7612..3cf25c8 100644 (file)
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -212,6 +212,7 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 {
        unsigned long cpu_id = (unsigned long)v - 1;
        unsigned int pvr;
+       unsigned long proc_freq;
        unsigned short maj;
        unsigned short min;
 
@@ -263,12 +264,19 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 #endif /* CONFIG_TAU */
 
        /*
-        * Assume here that all clock rates are the same in a
-        * smp system.  -- Cort
+        * Platforms that have variable clock rates, should implement
+        * the method ppc_md.get_proc_freq() that reports the clock
+        * rate of a given cpu. The rest can use ppc_proc_freq to
+        * report the clock rate that is same across all cpus.
         */
-       if (ppc_proc_freq)
+       if (ppc_md.get_proc_freq)
+               proc_freq = ppc_md.get_proc_freq(cpu_id);
+       else
+               proc_freq = ppc_proc_freq;
+
+       if (proc_freq)
                seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
-                          ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
+                          proc_freq / 1000000, proc_freq % 1000000);
 
        if (ppc_md.show_percpuinfo != NULL)
                ppc_md.show_percpuinfo(m, cpu_id);