Re: [PATCH v10 08/12] target/riscv: Add sscofpmf extension support

[Heiko Stübner]

Am Dienstag, 21. Juni 2022, 01:15:58 CEST schrieb Atish Patra:
> The Sscofpmf ('Ss' for Privileged arch and Supervisor-level extensions,
> and 'cofpmf' for Count OverFlow and Privilege Mode Filtering)
> extension allows the perf to handle overflow interrupts and filtering
> support. This patch provides a framework for programmable
> counters to leverage the extension. As the extension doesn't have any
> provision for the overflow bit for fixed counters, the fixed events
> can also be monitoring using programmable counters. The underlying
> counters for cycle and instruction counters are always running. Thus,
> a separate timer device is programmed to handle the overflow.
> 
> Signed-off-by: Atish Patra <atish.patra@wdc.com>
> Signed-off-by: Atish Patra <atishp@rivosinc.com>

it looks like patches 1-7 already landed in Qemu though I didn't
see any "applied" messages, so it took me a bit to realize that :-) .


In any case, I ran Atish's sample from the cover-letter with a matching
kernel nad got similar results as shown in the cover-letter.

Tested-by: Heiko Stuebner <heiko@sntech.de>