diff options
| author | Rob Bradford <rbradford@rivosinc.com> | 2023-10-31 15:37:17 +0000 |
|---|---|---|
| committer | Alistair Francis <alistair.francis@wdc.com> | 2023-11-07 11:06:02 +1000 |
| commit | bc5e8445342fee35b35f2ed9a9f2249e060b8776 (patch) | |
| tree | d348f9f95e9afdd825ca1e46daa211566dfb47fc /docs | |
| parent | 69b3849bff4bd5ab82241ad09426cd9ff7078449 (diff) | |
docs/about/deprecated: Document RISC-V "pmu-num" deprecation
This has been replaced by a "pmu-mask" property that provides much more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>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/about/deprecated.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index ecccd5d3fc..78550c07bf 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 ----------------------- |