| Message ID | 20231018154434.17367-6-rbradford@rivosinc.com |
|---|---|
| State | New |
| Headers | show |
| Series | Support discontinuous PMU counters | expand |
On Thu, Oct 19, 2023 at 1:47 AM Rob Bradford <rbradford@rivosinc.com> wrote: > > This has been replaced by a "pmu-mask" property that provides much more 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> Alistair > --- > docs/about/deprecated.rst | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst > index 2febd2d12f..857b5d4fc4 100644 > --- a/docs/about/deprecated.rst > +++ b/docs/about/deprecated.rst > @@ -405,6 +405,18 @@ 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 > ----------------------- > > -- > 2.41.0 > >
On Sun, Oct 22, 2023 at 7:04 PM Alistair Francis <alistair23@gmail.com> wrote: > > On Thu, Oct 19, 2023 at 1:47 AM Rob Bradford <rbradford@rivosinc.com> wrote: > > > > This has been replaced by a "pmu-mask" property that provides much more 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> > > Alistair > > > --- > > docs/about/deprecated.rst | 12 ++++++++++++ > > 1 file changed, 12 insertions(+) > > > > diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst > > index 2febd2d12f..857b5d4fc4 100644 > > --- a/docs/about/deprecated.rst > > +++ b/docs/about/deprecated.rst > > @@ -405,6 +405,18 @@ 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 > > ----------------------- > > > > -- > > 2.41.0 > > > > Reviewed-by: Atish Patra <atishp@rivosinc.com>
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst index 2febd2d12f..857b5d4fc4 100644 --- a/docs/about/deprecated.rst +++ b/docs/about/deprecated.rst @@ -405,6 +405,18 @@ 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 -----------------------