tile/perf: Support perf_events on tilegx and tilepro

Add perf support for tile architecture.

Signed-off-by: Zhigang Lu <zlu@tilera.com>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

arch/tile/Kconfig

@@ -3,6 +3,8 @@
 
 config TILE
 	def_bool y
+	select HAVE_PERF_EVENTS
+	select USE_PMC if PERF_EVENTS
 	select HAVE_DMA_ATTRS
 	select HAVE_DMA_API_DEBUG
 	select HAVE_KVM if !TILEGX

arch/tile/include/asm/perf_event.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2014 Tilera Corporation. All Rights Reserved.
+ *
+ *   This program is free software; you can redistribute it and/or
+ *   modify it under the terms of the GNU General Public License
+ *   as published by the Free Software Foundation, version 2.
+ *
+ *   This program is distributed in the hope that it will be useful, but
+ *   WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ *   NON INFRINGEMENT.  See the GNU General Public License for
+ *   more details.
+ */
+
+#ifndef _ASM_TILE_PERF_EVENT_H
+#define _ASM_TILE_PERF_EVENT_H
+
+#include <linux/percpu.h>
+DECLARE_PER_CPU(u64, perf_irqs);
+
+unsigned long handle_syscall_link_address(void);
+#endif /* _ASM_TILE_PERF_EVENT_H */

arch/tile/kernel/Makefile

@@ -25,6 +25,7 @@ obj-$(CONFIG_PCI)		+= pci_gx.o
 else
 obj-$(CONFIG_PCI)		+= pci.o
 endif
+obj-$(CONFIG_PERF_EVENTS)	+= perf_event.o
 obj-$(CONFIG_USE_PMC)		+= pmc.o
 obj-$(CONFIG_TILE_USB)		+= usb.o
 obj-$(CONFIG_TILE_HVGLUE_TRACE)	+= hvglue_trace.o

arch/tile/kernel/irq.c

@@ -21,6 +21,7 @@
 #include <hv/drv_pcie_rc_intf.h>
 #include <arch/spr_def.h>
 #include <asm/traps.h>
+#include <linux/perf_event.h>
 
 /* Bit-flag stored in irq_desc->chip_data to indicate HW-cleared irqs. */
 #define IS_HW_CLEARED 1
@@ -260,6 +261,23 @@ void ack_bad_irq(unsigned int irq)
 	pr_err("unexpected IRQ trap at vector %02x\n", irq);
 }
 
+/*
+ * /proc/interrupts printing:
+ */
+int arch_show_interrupts(struct seq_file *p, int prec)
+{
+#ifdef CONFIG_PERF_EVENTS
+	int i;
+
+	seq_printf(p, "%*s: ", prec, "PMI");
+
+	for_each_online_cpu(i)
+		seq_printf(p, "%10llu ", per_cpu(perf_irqs, i));
+	seq_puts(p, "  perf_events\n");
+#endif
+	return 0;
+}
+
 /*
  * Generic, controller-independent functions:
  */