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Thu, 28 Jan 2021 02:49:01 -0800 (PST) From: Viresh Kumar To: Ionela Voinescu , Rafael Wysocki , Catalin Marinas , Will Deacon Subject: [PATCH V3 0/2] cpufreq: cppc: Add support for frequency invariance Date: Thu, 28 Jan 2021 16:18:54 +0530 Message-Id: X-Mailer: git-send-email 2.25.0.rc1.19.g042ed3e048af MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210128_054905_999627_B800E1D9 X-CRM114-Status: GOOD ( 15.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vincent Guittot , linux-pm@vger.kernel.org, Viresh Kumar , linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Sudeep Holla , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello, CPPC cpufreq driver is used for ARM servers and this patch series tries to provide counter-based frequency invariance support for them in the absence for architecture specific counters (like AMUs). This is tested with some hacks, as I didn't have access to the right hardware, on the ARM64 hikey board to check the overall functionality and that works fine. Vincent/Ionela, it would be nice if you guys can give this a shot on some real hardware where counters work. This is based of pm/linux-next (need some stuff from the arm64 tree). These patches should get merged via the arm64 tree only for the same reason. Changes since V2: - Not sending as an RFC anymore. - Several renames, reordering of code in 1/2 based on Ionela's comments. - Several rebase changes for 2/2. - The freq_scale calculations are optimized a bit. - Better overall commenting and commit logs. Changes since V1: - The interface for setting the callbacks is improved, so different parts looking to provide their callbacks don't need to think about each other. - Moved to per-cpu storage for storing the callback related data, AMU counters have higher priority with this. --- viresh Viresh Kumar (2): topology: Allow multiple entities to provide sched_freq_tick() callback cpufreq: cppc: Add support for frequency invariance arch/arm64/include/asm/topology.h | 10 +- arch/arm64/kernel/topology.c | 89 +++++++-------- drivers/base/arch_topology.c | 56 +++++++++- drivers/cpufreq/cppc_cpufreq.c | 179 ++++++++++++++++++++++++++++-- include/linux/arch_topology.h | 15 ++- kernel/sched/core.c | 1 + 6 files changed, 274 insertions(+), 76 deletions(-)