[RFC V1 10/11] perf: Expand perf_branch_entry.type

[Rob Herring]

On Mon, Jan 24, 2022 at 10:00:52AM +0530, Anshuman Khandual wrote:
> Current perf_branch_entry.type is a 4 bits field just enough to accommodate
> 16 generic branch types. This is insufficient to accommodate platforms like
> arm64 which has much more branch types. Lets just expands this field into a
> 6 bits one, which can now hold 64 generic branch types. This also adds more
> generic branch types and updates the BRBE driver as required.
> 
> Cc: Peter Zijlstra <peterz at infradead.org>
> Cc: Ingo Molnar <mingo at redhat.com>
> Cc: Arnaldo Carvalho de Melo <acme at kernel.org>
> Cc: Mark Rutland <mark.rutland at arm.com>
> Cc: Alexander Shishkin <alexander.shishkin at linux.intel.com>
> Cc: Jiri Olsa <jolsa at redhat.com>
> Cc: Namhyung Kim <namhyung at kernel.org>
> Cc: Will Deacon <will at kernel.org>
> Cc: linux-arm-kernel at lists.infradead.org
> Cc: linux-perf-users at vger.kernel.org
> Cc: linux-kernel at vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual at arm.com>
> ---
>  drivers/perf/arm_pmu_brbe.c           |  7 ++++++-

This patch should come before the BRBE support so that it can be applied
sooner rather than later. If another field is added to the end before 
expanding this field, then you will be stuck with assembling bits from 2 
fields.

>  include/uapi/linux/perf_event.h       | 10 ++++++++--
>  tools/include/uapi/linux/perf_event.h | 10 ++++++++--
>  tools/perf/util/branch.c              |  8 +++++++-
>  4 files changed, 29 insertions(+), 6 deletions(-)