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powerpc/perf: Core EBB support for 64-bit book3s

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Add support for EBB (Event Based Branches) on 64-bit book3s. See the
included documentation for more details.

EBBs are a feature which allows the hardware to branch directly to a
specified user space address when a PMU event overflows. This can be
used by programs for self-monitoring with no kernel involvement in the
inner loop.

Most of the logic is in the generic book3s code, primarily to avoid a
proliferation of PMU callbacks.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman
2013-06-28 18:15:16 +10:00
committed by Benjamin Herrenschmidt
parent 2ac138ca21
commit 330a1eb777
8 changed files with 321 additions and 14 deletions
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3
arch/powerpc/include/asm/processor.h
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@@ -287,8 +287,9 @@ struct thread_struct {
unsigned long siar;
unsigned long sdar;
unsigned long sier;
unsigned long mmcr0;
unsigned long mmcr2;
unsigned mmcr0;
unsigned used_ebb;
#endif
};