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[v5,5/5] docs/about/deprecated: Document RISC-V "pmu-num" deprecation

Message ID 20231031154000.18134-6-rbradford@rivosinc.com
State New
Headers show
Series Support discontinuous PMU counters | expand

Commit Message

Rob Bradford Oct. 31, 2023, 3:37 p.m. UTC 
This has been replaced by a "pmu-mask" property that provides much more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>
---
 docs/about/deprecated.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)
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Patch

diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index 4e0eb2fe02..60c26bc410 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -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
 -----------------------