tree 138693772ff043ec23e335a1ef42df7a7d5707ba
parent 2ac138ca21ad26c988ce7c91d27327f85beb7519
author Michael Ellerman <michael@ellerman.id.au> 1372407316 +1000
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1372643410 +1000

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

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>