MIPS: MT: proc: Add support for printing VPE and TC ids

And there are more CPUs or configurations that want to provide special
per-CPU information in /proc/cpuinfo.  So I think there needs to be a
hook mechanism, such as a notifier.

This is a first cut only; I need to think about what sort of looking
the notifier needs to have.  But I'd appreciate testing on MT hardware!

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6066/

1 files changed, 21 insertions, 0 deletions

diff --git a/arch/mips/include/asm/cpu-info.h b/arch/mips/include/asm/cpu-info.h
index 49953f717334..dc2135be2a3a 100644
--- a/arch/mips/include/asm/cpu-info.h
+++ b/arch/mips/include/asm/cpu-info.h
@@ -96,6 +96,27 @@ extern void cpu_report(void);
 extern const char *__cpu_name[];
 #define cpu_name_string()       __cpu_name[smp_processor_id()]
 
+struct seq_file;
+struct notifier_block;
+
+extern int register_proc_cpuinfo_notifier(struct notifier_block *nb);
+extern int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v);
+
+#define proc_cpuinfo_notifier(fn, pri)                                  \
+({                                                                      \
+        static struct notifier_block fn##_nb = {                        \
+                .notifier_call = fn,                                    \
+                .priority = pri                                         \
+        };                                                              \
+                                                                        \
+        register_proc_cpuinfo_notifier(&fn##_nb);                       \
+})
+
+struct proc_cpuinfo_notifier_args {
+        struct seq_file *m;
+        unsigned long n;
+};
+
 #if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
 # define cpu_vpe_id(cpuinfo)    ((cpuinfo)->vpe_id)
 #else