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[78.210.255.2]) by smtp.googlemail.com with ESMTPSA id w185sm2406511wma.39.2019.05.15.03.16.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 15 May 2019 03:16:35 -0700 (PDT) Subject: Re: [PATCH v4 2/3] PM / EM: Expose perf domain struct To: Quentin Perret Cc: edubezval@gmail.com, rui.zhang@intel.com, javi.merino@kernel.org, viresh.kumar@linaro.org, amit.kachhap@gmail.com, rjw@rjwysocki.net, will.deacon@arm.com, catalin.marinas@arm.com, dietmar.eggemann@arm.com, ionela.voinescu@arm.com, mka@chromium.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20190515082318.7993-1-quentin.perret@arm.com> <20190515082318.7993-3-quentin.perret@arm.com> <0ced18eb-e424-fe6b-b11e-165a3c108170@linaro.org> <20190515091658.sbpg6qiovhtblqyr@queper01-lin> <698400c0-e0a4-4a86-b9df-cdb9bd683c0f@linaro.org> <20190515100748.q3t4kt72h2akdpcs@queper01-lin> From: Daniel Lezcano Message-ID: Date: Wed, 15 May 2019 12:16:34 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190515100748.q3t4kt72h2akdpcs@queper01-lin> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 15/05/2019 12:07, Quentin Perret wrote: > On Wednesday 15 May 2019 at 11:56:30 (+0200), Daniel Lezcano wrote: >> On 15/05/2019 11:17, Quentin Perret wrote: >>> Hi Daniel, >>> >>> On Wednesday 15 May 2019 at 11:06:18 (+0200), Daniel Lezcano wrote: >>>> On 15/05/2019 10:23, Quentin Perret wrote: >>>>> In the current state, the perf_domain struct is fully defined only when >>>>> CONFIG_ENERGY_MODEL=y. Since we need to write code that compiles both >>>>> with or without that option in the thermal framework, make sure to >>>>> actually define the struct regardless of the config option. That allows >>>>> to avoid using stubbed accessor functions all the time in code paths >>>>> that use the EM. >>>>> >>>>> Acked-by: Viresh Kumar >>>>> Signed-off-by: Quentin Perret >>>> >>>> This patch implies the cpu cooling device can be set without the energy >>>> model. >>>> >>>> Isn't it possible to make a strong dependency for the cpu cooling device >>>> on the energy model option, add the energy model as default on arm arch >>>> and drop this patch? >>> >>> Right, that should work too. >>> >>>> After all, the cpu cooling is using the em framework. >>> >>> The reason I did it that way is simply to keep things flexible. If you >>> don't compile in THERMAL_GOV_POWER_ALLOCATOR, you will never use the EM >>> for CPU thermal. So I thought it would be good to not mandate compiling >>> in ENERGY_MODEL in this case -- that should save a bit of space. >>> >>> But TBH I don't have a strong opinion on this one, so if everybody >>> agrees it's fine to just make CPU_THERMAL depend on ENERGY_MODEL, I'm >>> happy to drop this patch and fix patch 3/3. That would indeed simplify >>> things a bit. >> >> Ok in this case it will be better to drop the 2/3 and add a small series >> doing for the cpu_cooling.c >> >> #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR >> >> /* structure freq */ >> >> /* power2state */ >> >> /* state2power*/ >> >> /* getrequestedpower */ >> >> /* All functions needed for the above */ >> >> #endif >> >> static struct thermal_cooling_device_ops cpufreq_cooling_ops = { >> .get_max_state = cpufreq_get_max_state, >> .get_cur_state = cpufreq_get_cur_state, >> .set_cur_state = cpufreq_set_cur_state, >> #ifdef CONFIG_THERMAL_GOV_POWER_ALLOCATOR >> .get_requested_power = cpufreq_get_requested_power, >> .state2power = cpufreq_state2power, >> .power2state = cpufreq_power2state, >> #endif >> }; >> >> So you don't have to care about ENERGY_MODEL to be set as >> THERMAL_GOV_POWER_ALLOCATOR depends on it. >> >> I think the result for cpu_cooling.c will be even more cleaner with the >> em change. > > OK, that works for me. I'll give it a go in v5. Viresh what do you think ? -- Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog