Messages in this thread | | | Date | Wed, 26 Oct 2022 22:02:59 -0700 (PDT) | Subject | Re: [PATCH v6 0/2] riscv_pmu_sbi: add support for PMU variant on T-Head C9xx cores | From | Palmer Dabbelt <> |
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On Tue, 11 Oct 2022 16:18:39 PDT (-0700), heiko@sntech.de wrote: > The PMU on T-Head C9xx cores is quite similar to the SSCOFPMF extension > but not completely identical, so this series
The rest of that sentance got dropped, so I put in
The PMU on T-Head C9xx cores is quite similar to the SSCOFPMF extension but not completely identical, so this series adds a T-Head PMU errata that handlen the differences.
but LMK if you had a better version, it's still early so I don't mind swapping it around.
b4 also got kind of confused here so I had to merge suff manually.
> changes in v6: > - follow Anup's suggestion and hook into the (pending) cpuinfo patch [2] > instead of modifying the core sbi_get_* functions > > changes in v5: > - add received Reviews > - fix sbi caching wrt. negative values (Drew) > - add comment about specific c9xx arch- and imp-ids (Conor) > > changes in v4: > - add new patch to cache sbi mvendor, march and mimp-ids (Atish) > - errata dependencies in one line (Conor) > - make driver detection conditional on CONFIG_ERRATA_THEAD_PMU too (Atish) > > changes in v3: > - improve commit message (Atish, Conor) > - IS_ENABLED and BIT() in errata probe (Conor) > > The change depends on my cpufeature/t-head errata probe cleanup series [1]. > > > changes in v2: > - use alternatives for the CSR access > - make the irq num selection a bit nicer > > There is of course a matching opensbi-part whose most recent implementation > can be found on [0]. > > > [0] https://patchwork.ozlabs.org/project/opensbi/cover/20221004164227.1381825-1-heiko@sntech.de > [1] https://lore.kernel.org/all/20220905111027.2463297-1-heiko@sntech.de/ > [2] https://lore.kernel.org/r/20220727043829.151794-1-apatel@ventanamicro.com > > Heiko Stuebner (2): > RISC-V: Cache SBI vendor values > drivers/perf: riscv_pmu_sbi: add support for PMU variant on T-Head > C9xx cores > > arch/riscv/Kconfig.erratas | 13 +++++++++++ > arch/riscv/errata/thead/errata.c | 19 ++++++++++++++++ > arch/riscv/include/asm/errata_list.h | 16 ++++++++++++- > arch/riscv/include/asm/sbi.h | 5 ++++ > arch/riscv/kernel/cpu.c | 30 +++++++++++++++++++++--- > drivers/perf/riscv_pmu_sbi.c | 34 ++++++++++++++++++++-------- > 6 files changed, 103 insertions(+), 14 deletions(-)
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