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, 23 insertions, 0 deletions

diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c
index f0df7fd..e40971b 100644
--- a/arch/mips/kernel/proc.c
+++ b/arch/mips/kernel/proc.c
@@ -17,8 +17,24 @@
 
 unsigned int vced_count, vcei_count;
 
+/*
+ *  * No lock; only written during early bootup by CPU 0.
+ *   */
+static RAW_NOTIFIER_HEAD(proc_cpuinfo_chain);
+
+int __ref register_proc_cpuinfo_notifier(struct notifier_block *nb)
+{
+	return raw_notifier_chain_register(&proc_cpuinfo_chain, nb);
+}
+
+int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v)
+{
+	return raw_notifier_call_chain(&proc_cpuinfo_chain, val, v);
+}
+
 static int show_cpuinfo(struct seq_file *m, void *v)
 {
+	struct proc_cpuinfo_notifier_args proc_cpuinfo_notifier_args;
 	unsigned long n = (unsigned long) v - 1;
 	unsigned int version = cpu_data[n].processor_id;
 	unsigned int fp_vers = cpu_data[n].fpu_id;
@@ -120,6 +136,13 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		      cpu_has_vce ? "%u" : "not available");
 	seq_printf(m, fmt, 'D', vced_count);
 	seq_printf(m, fmt, 'I', vcei_count);
+
+	proc_cpuinfo_notifier_args.m = m;
+	proc_cpuinfo_notifier_args.n = n;
+
+	raw_notifier_call_chain(&proc_cpuinfo_chain, 0,
+				&proc_cpuinfo_notifier_args);
+
 	seq_printf(m, "\n");
 
 	return 0;