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(h-178-174-189-39.A498.priv.bahnhof.se. [178.174.189.39]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-529711fa7f3sm562002e87.258.2024.05.27.07.26.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 May 2024 07:26:07 -0700 (PDT) From: Ulf Hansson To: "Rafael J . Wysocki" , Sudeep Holla , linux-pm@vger.kernel.org Cc: Lorenzo Pieralisi , Nikunj Kela , Prasad Sodagudi , Maulik Shah , Daniel Lezcano , Krzysztof Kozlowski , Ulf Hansson , linux-rt-users@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 0/7] pmdomain/cpuidle-psci: Support s2idle/s2ram on PREEMPT_RT Date: Mon, 27 May 2024 16:25:50 +0200 Message-Id: <20240527142557.321610-1-ulf.hansson@linaro.org> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Updates in v2: - Rebased and fixed a small issue in genpd, see patch3. - Re-tested on v6.9-rt5 (PREEMPT_RT enabled) - Re-tested on v6.10-rc1 (for regressions, PREEMPT_RT disabled) The hierarchical PM domain topology and the corresponding domain-idle-states are currently disabled on a PREEMPT_RT based configuration. The main reason is because spinlocks are turned into sleepable locks on PREEMPT_RT, which means genpd and runtime PM can't be use in the atomic idle-path when selecting/entering an idle-state. For s2idle/s2ram this is an unnecessary limitation that this series intends to address. Note that, the support for cpuhotplug is left to future improvements. More information about this are available in the commit messages. I have tested this on a Dragonboard 410c. Kind regards Ulf Hansson Ulf Hansson (7): pmdomain: core: Enable s2idle for CPU PM domains on PREEMPT_RT pmdomain: core: Don't hold the genpd-lock when calling dev_pm_domain_set() pmdomain: core: Use dev_name() instead of kobject_get_path() in debugfs cpuidle: psci-domain: Enable system-wide suspend on PREEMPT_RT cpuidle: psci: Drop redundant assignment of CPUIDLE_FLAG_RCU_IDLE cpuidle: psci: Enable the hierarchical topology for s2ram on PREEMPT_RT cpuidle: psci: Enable the hierarchical topology for s2idle on PREEMPT_RT drivers/cpuidle/cpuidle-psci-domain.c | 10 ++-- drivers/cpuidle/cpuidle-psci.c | 26 ++++++---- drivers/pmdomain/core.c | 75 +++++++++++++++++++-------- include/linux/pm_domain.h | 5 +- 4 files changed, 80 insertions(+), 36 deletions(-)