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docs/about/deprecated: Document RISC-V "pmu-num" deprecation

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This has been replaced by a "pmu-mask" property that provides much more
flexibility.

Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
Acked-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Message-ID: <20231031154000.18134-6-rbradford@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
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Rob Bradford 2023-10-31 15:37:17 +00:00 committed by Alistair Francis
parent 69b3849bff
commit bc5e844534
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docs/about/deprecated.rst
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@ -413,6 +413,18 @@ Specifying the iSCSI password in plain text on the command line using the
used instead, to refer to a ``--object secret...`` instance that provides
a password via a file, or encrypted.
CPU device properties
'''''''''''''''''''''
``pmu-num=n`` on RISC-V CPUs (since 8.2)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
In order to support more flexible counter configurations this has been replaced
by a ``pmu-mask`` property. If set of counters is continuous then the mask can
be calculated with ``((2 ^ n) - 1) << 3``. The least significant three bits
must be left clear.
Backwards compatibility
-----------------------