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Re: [PATCH 00/16] hw/mips: Set CPU frequency
From: |
Igor Mammedov |
Subject: |
Re: [PATCH 00/16] hw/mips: Set CPU frequency |
Date: |
Wed, 30 Sep 2020 09:40:48 +0200 |
On Mon, 28 Sep 2020 19:15:23 +0200
Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
> All the MIPS cores emulated by QEMU provides the Coproc#0
> 'Count' register which can be used as a free running timer.
>
> Since it's introduction in 2005 this timer uses a fixed
> frequency of 100 MHz (for a CPU freq of 200 MHz).
> While this is not an issue with Linux guests, it makes
> some firmwares behave incorrectly.
>
> The Clock API allow propagating clocks. It is particularly
> useful when hardware dynamicly changes clock frequencies.
>
> To be able to model such MIPS hardware, we need to refactor
> the MIPS hardware code to handle clocks.
>
> This series is organized as follow:
>
> - let all CPU have an input clock,
> - MIPS CPU get an input clock
> - when the clock is changed, CP0 timer is updated
> - set correct CPU frequencies to all boards
> - do not allow MIPS CPU without input clock
is this clock an integral part of MIPS cpus or it's an external device?
> I used a MIPSsim test suggested by Thomas. It is also included
> as bonus at the end.
>
> Possible follow up:
> - QOM'ify the GIC
> - let the GIC handle dynamic clock changes
>
> Regards,
>
> Phil.
>
> Philippe Mathieu-Daudé (16):
> hw/core/cpu: Let CPU object have a clock source
> target/mips: Move cpu_mips_get_random() with CP0 helpers
> target/mips/cp0_timer: Explicit unit in variable name
> target/mips/cpu: Introduce mips_cpu_properties[]
> target/mips/cpu: Set default CPU frequency to 200 MHz
> target/mips: Keep CP0 counter in sync with the CPU frequency
> hw/mips/r4k: Explicit CPU frequency is 200 MHz
> hw/mips/fuloong2e: Set CPU frequency to 533 MHz
> hw/mips/mipssim: Correct CPU frequency
> hw/mips/jazz: Correct CPU frequencies
> hw/mips/cps: Expose input clock and connect it to CPU cores
> hw/mips/boston: Set CPU frequency to 1 GHz
> hw/mips/malta: Set CPU frequency to 320 MHz
> hw/mips/cps: Do not allow use without input clock
> target/mips/cpu: Do not allow system-mode use without input clock
> tests/acceptance: Test the MIPSsim machine
>
> include/hw/core/cpu.h | 5 +++
> include/hw/mips/cps.h | 2 +
> target/mips/cpu.h | 9 ++++
> target/mips/internal.h | 2 +-
> hw/core/cpu.c | 12 +++++
> hw/mips/boston.c | 13 ++++++
> hw/mips/cps.c | 8 ++++
> hw/mips/fuloong2e.c | 8 +++-
> hw/mips/jazz.c | 16 ++++++-
> hw/mips/malta.c | 20 +++++++--
> hw/mips/mipssim.c | 12 ++++-
> hw/mips/r4k.c | 8 +++-
> target/mips/cp0_helper.c | 25 +++++++++++
> target/mips/cp0_timer.c | 51 ++++++---------------
> target/mips/cpu.c | 43 +++++++++++++++++-
> MAINTAINERS | 1 +
> tests/acceptance/machine_mips_mipssim.py | 56 ++++++++++++++++++++++++
> 17 files changed, 244 insertions(+), 47 deletions(-)
> create mode 100644 tests/acceptance/machine_mips_mipssim.py
>
- [PATCH 16/16] tests/acceptance: Test the MIPSsim machine, (continued)
- [PATCH 16/16] tests/acceptance: Test the MIPSsim machine, Philippe Mathieu-Daudé, 2020/09/28
- Re: [PATCH 16/16] tests/acceptance: Test the MIPSsim machine, Willian Rampazzo, 2020/09/28
- Re: [PATCH 16/16] tests/acceptance: Test the MIPSsim machine, Philippe Mathieu-Daudé, 2020/09/29
- Re: [PATCH 16/16] tests/acceptance: Test the MIPSsim machine, Alex Bennée, 2020/09/29
- Re: [PATCH 16/16] tests/acceptance: Test the MIPSsim machine, Philippe Mathieu-Daudé, 2020/09/29
- Re: [PATCH 16/16] tests/acceptance: Test the MIPSsim machine, Daniel P . Berrangé, 2020/09/30
- Re: [PATCH 16/16] tests/acceptance: Test the MIPSsim machine, Alex Bennée, 2020/09/30
- Re: [PATCH 16/16] tests/acceptance: Test the MIPSsim machine, Philippe Mathieu-Daudé, 2020/09/30
Re: [PATCH 00/16] hw/mips: Set CPU frequency, no-reply, 2020/09/28
Re: [PATCH 00/16] hw/mips: Set CPU frequency,
Igor Mammedov <=