tile: Add support for handling PMC hardware
The PMC module is used by perf_events, oprofile and watchdogs.
Signed-off-by: Zhigang Lu <zlu@tilera.com>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
diff --git a/arch/tile/include/asm/pmc.h b/arch/tile/include/asm/pmc.h
new file mode 100644
index 0000000..7ae3956
--- /dev/null
+++ b/arch/tile/include/asm/pmc.h
@@ -0,0 +1,64 @@
+/*
+ * 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_PMC_H
+#define _ASM_TILE_PMC_H
+
+#include <linux/ptrace.h>
+
+#define TILE_BASE_COUNTERS 2
+
+/* Bitfields below are derived from SPR PERF_COUNT_CTL*/
+#ifndef __tilegx__
+/* PERF_COUNT_CTL on TILEPro */
+#define TILE_CTL_EXCL_USER (1 << 7) /* exclude user level */
+#define TILE_CTL_EXCL_KERNEL (1 << 8) /* exclude kernel level */
+#define TILE_CTL_EXCL_HV (1 << 9) /* exclude hypervisor level */
+
+#define TILE_SEL_MASK 0x7f /* 7 bits for event SEL,
+ COUNT_0_SEL */
+#define TILE_PLM_MASK 0x780 /* 4 bits priv level msks,
+ COUNT_0_MASK*/
+#define TILE_EVENT_MASK (TILE_SEL_MASK | TILE_PLM_MASK)
+
+#else /* __tilegx__*/
+/* PERF_COUNT_CTL on TILEGx*/
+#define TILE_CTL_EXCL_USER (1 << 10) /* exclude user level */
+#define TILE_CTL_EXCL_KERNEL (1 << 11) /* exclude kernel level */
+#define TILE_CTL_EXCL_HV (1 << 12) /* exclude hypervisor level */
+
+#define TILE_SEL_MASK 0x3f /* 6 bits for event SEL,
+ COUNT_0_SEL*/
+#define TILE_BOX_MASK 0x1c0 /* 3 bits box msks,
+ COUNT_0_BOX */
+#define TILE_PLM_MASK 0x3c00 /* 4 bits priv level msks,
+ COUNT_0_MASK */
+#define TILE_EVENT_MASK (TILE_SEL_MASK | TILE_BOX_MASK | TILE_PLM_MASK)
+#endif /* __tilegx__*/
+
+/* Takes register and fault number. Returns error to disable the interrupt. */
+typedef int (*perf_irq_t)(struct pt_regs *, int);
+
+int userspace_perf_handler(struct pt_regs *regs, int fault);
+
+perf_irq_t reserve_pmc_hardware(perf_irq_t new_perf_irq);
+void release_pmc_hardware(void);
+
+unsigned long pmc_get_overflow(void);
+void pmc_ack_overflow(unsigned long status);
+
+void unmask_pmc_interrupts(void);
+void mask_pmc_interrupts(void);
+
+#endif /* _ASM_TILE_PMC_H */