xuantie: pmu: Support cycles&instructions overflow interrupt #1
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The Sscofpmf spec does not define overflow interrupts for cycles & instructions [1]. But this is indispensable in performance profiling. Xuantie added registers mhpmevent0 and mhpmevent2, with addresses 0x7E0 and 0x7E1 respectively, which are used to configure cycles & instructions. At the same time, mxstatus[8] is newly defined as ofint to control whether the cycles and instructions events of HPCP can generate interrupt 13 (lcofip). When it is 1, an interrupt can be generated, and when it is 0, an interrupt cannot be generated. This patch is used to support the above functions. [1] riscvarchive/riscv-count-overflow#5 Signed-off-by: Chen Pei <cp0613@linux.alibaba.com>
guoren83
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Nov 18, 2024
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Why implement the two scenarios? |
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You can see the reference No.[1] in the commit description. Thanks. |
cp0613
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Jul 24, 2025
Instead of having one common FDT MPXY RPMI mailbox client drivers for various RPMI service groups, split this driver into two parts: 1) Common MPXY RPMI mailbox client library 2) MPXY driver for RPMI clock service group The above split enables having a separate MPXY driver for each RPMI clock service group and XUANTIE-RV#1 (above) will allow code sharing between various MPXY RPMI drivers. Signed-off-by: Anup Patel <apatel@ventanamicro.com>
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The Sscofpmf spec does not define overflow interrupts for cycles & instructions [1]. But this is indispensable in performance profiling.
Xuantie added registers mhpmevent0 and mhpmevent2, with addresses 0x7E0 and 0x7E1 respectively, which are used to configure cycles & instructions.
At the same time, mxstatus[8] is newly defined as ofint to control whether the cycles and instructions events of HPCP can generate interrupt 13 (lcofip). When it is 1, an interrupt can be generated, and when it is 0, an interrupt cannot be generated.
This patch is used to support the above functions. Changes to mxstatus will be committed in zsb [2].
[1] riscvarchive/riscv-count-overflow#5
[2] https://github.com/XUANTIE-RV/zero_stage_boot