3 Commits

Author	SHA1	Message	Date
Vincent Guittot	9942cb22ea	sched/topology: Add a new arch_scale_freq_ref() method ... Create a new method to get a unique and fixed max frequency. Currently cpuinfo.max_freq or the highest (or last) state of performance domain are used as the max frequency when computing the frequency for a level of utilization, but: - cpuinfo_max_freq can change at runtime. boost is one example of such change. - cpuinfo.max_freq and last item of the PD can be different leading to different results between cpufreq and energy model. We need to save the reference frequency that has been used when computing the CPUs capacity and use this fixed and coherent value to convert between frequency and CPU's capacity. In fact, we already save the frequency that has been used when computing the capacity of each CPU. We extend the precision to save kHz instead of MHz currently and we modify the type to be aligned with other variables used when converting frequency to capacity and the other way. [ mingo: Minor edits. ] Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Tested-by: Lukasz Luba <lukasz.luba@arm.com> Reviewed-by: Lukasz Luba <lukasz.luba@arm.com> Acked-by: Sudeep Holla <sudeep.holla@arm.com> Link: https://lore.kernel.org/r/20231211104855.558096-2-vincent.guittot@linaro.org	2023-12-23 15:52:34 +01:00
Palmer Dabbelt	310c33dc7a	Merge patch series "Introduce 64b relocatable kernel" ... Alexandre Ghiti <alexghiti@rivosinc.com> says: After multiple attempts, this patchset is now based on the fact that the 64b kernel mapping was moved outside the linear mapping. The first patch allows to build relocatable kernels but is not selected by default. That patch is a requirement for KASLR. The second and third patches take advantage of an already existing powerpc script that checks relocations at compile-time, and uses it for riscv. * b4-shazam-merge: riscv: Use --emit-relocs in order to move .rela.dyn in init riscv: Check relocations at compile time powerpc: Move script to check relocations at compile time in scripts/ riscv: Introduce CONFIG_RELOCATABLE riscv: Move .rela.dyn outside of init to avoid empty relocations riscv: Prepare EFI header for relocatable kernels Link: https://lore.kernel.org/r/20230329045329.64565-1-alexghiti@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>	2023-04-19 07:47:45 -07:00
Song Shuai	c4b52d8b6c	riscv: export cpu/freq invariant to scheduler ... RISC-V now manages CPU topology using arch_topology which provides CPU capacity and frequency related interfaces to access the cpu/freq invariant in possible heterogeneous or DVFS-enabled platforms. Here adds topology.h file to export the arch_topology interfaces for replacing the scheduler's constant-based cpu/freq invariant accounting. Signed-off-by: Song Shuai <suagrfillet@gmail.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Ley Foon Tan <lftan@kernel.org> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20230323123924.3032174-1-suagrfillet@gmail.com [Palmer: Fix the whitespace issues.] Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>	2023-04-18 20:29:37 -07:00