00e6c92304
Add OProfile support for metag, using the perf backend, and falling back to generic timer based sampling if perf counter interrupt support is disabled. The oprofile code prepends "metag/" to the perf pmu name to give "metag/meta2" which is more consistent with other oprofile arch names. The backtrace code makes use of <asm/stacktrace.h> for kernel backtracing, and a simple frame pointer walk for userland backtracing. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Robert Richter <rric@kernel.org> Cc: oprofile-list@lists.sf.net
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/*
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* arch/metag/oprofile/common.c
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*
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* Copyright (C) 2013 Imagination Technologies Ltd.
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*
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* Based on arch/sh/oprofile/common.c:
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*
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* Copyright (C) 2003 - 2010 Paul Mundt
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*
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* Based on arch/mips/oprofile/common.c:
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*
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* Copyright (C) 2004, 2005 Ralf Baechle
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* Copyright (C) 2005 MIPS Technologies, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/oprofile.h>
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#include <linux/perf_event.h>
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#include <linux/slab.h>
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#include "backtrace.h"
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#ifdef CONFIG_HW_PERF_EVENTS
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/*
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* This will need to be reworked when multiple PMUs are supported.
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*/
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static char *metag_pmu_op_name;
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char *op_name_from_perf_id(void)
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{
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return metag_pmu_op_name;
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}
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int __init oprofile_arch_init(struct oprofile_operations *ops)
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{
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ops->backtrace = metag_backtrace;
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if (perf_num_counters() == 0)
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return -ENODEV;
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metag_pmu_op_name = kasprintf(GFP_KERNEL, "metag/%s",
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perf_pmu_name());
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if (unlikely(!metag_pmu_op_name))
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return -ENOMEM;
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return oprofile_perf_init(ops);
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}
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void oprofile_arch_exit(void)
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{
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oprofile_perf_exit();
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kfree(metag_pmu_op_name);
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}
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#else
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int __init oprofile_arch_init(struct oprofile_operations *ops)
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{
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ops->backtrace = metag_backtrace;
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/* fall back to timer interrupt PC sampling */
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return -ENODEV;
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}
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void oprofile_arch_exit(void) {}
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#endif /* CONFIG_HW_PERF_EVENTS */
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