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

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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>
This commit is contained in:
Gautham R. Shenoy
2014-03-11 17:01:18 +05:30
committed by Benjamin Herrenschmidt
parent 2196c6f1ed
commit 2299d03a63
2 changed files with 14 additions and 4 deletions
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2
arch/powerpc/include/asm/machdep.h
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@@ -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);