From: Bjorn Andersson <bjorn.andersson@linaro.org> To: Sudeep Holla <sudeep.holla@arm.com> Cc: Ulf Hansson <ulf.hansson@linaro.org>, "Rafael J. Wysocki" <rafael@kernel.org>, Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>, Mark Rutland <mark.rutland@arm.com>, Linux ARM <linux-arm-kernel@lists.infradead.org>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, Daniel Lezcano <daniel.lezcano@linaro.org>, "Raju P . L . S . S . S . N" <rplsssn@codeaurora.org>, Amit Kucheria <amit.kucheria@linaro.org>, Stephen Boyd <sboyd@kernel.org>, Niklas Cassel <niklas.cassel@linaro.org>, Tony Lindgren <tony@atomide.com>, Kevin Hilman <khilman@kernel.org>, Lina Iyer <ilina@codeaurora.org>, Viresh Kumar <viresh.kumar@linaro.org>, Vincent Guittot <vincent.guittot@linaro.org>, Geert Uytterhoeven <geert+renesas@glider.be>, Souvik Chakravarty <souvik.chakravarty@arm.com>, Linux PM <linux-pm@vger.kernel.org>, linux-arm-msm <linux-arm-msm@vger.kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 00/18] ARM/ARM64: Support hierarchical CPU arrangement for PSCI Date: Fri, 7 Jun 2019 12:34:07 -0700 [thread overview] Message-ID: <20190607193407.GB24059@builder> (raw) In-Reply-To: <20190607154210.GJ15577@e107155-lin> On Fri 07 Jun 08:42 PDT 2019, Sudeep Holla wrote: > On Tue, May 14, 2019 at 10:58:04AM +0200, Ulf Hansson wrote: > > On Tue, 14 May 2019 at 10:08, Rafael J. Wysocki <rafael@kernel.org> wrote: > > > > > > On Mon, May 13, 2019 at 9:23 PM Ulf Hansson <ulf.hansson@linaro.org> wrote: > > > > > > > > This series enables support for hierarchical CPU arrangement, managed by PSCI > > > > for ARM/ARM64. It's based on using the generic PM domain (genpd), which > > > > recently was extended to manage devices belonging to CPUs. > > > > > > ACK for the patches touching cpuidle in this series (from the > > > framework perspective), but I'm assuming it to be taken care of by > > > ARM/ARM64 maintainers. > > > > Thanks for the ack! Yes, this is for PSCI/ARM maintainers. > > > > BTW, apologize for sending this in the merge window, but wanted to > > take the opportunity for people to have a look before OSPM Pisa next > > week. > > > > I will start looking at this series. But I would request PSCI/other > maintainers to wait until we see some comparison data before we merge. What comparison are you asking for here? Do you want to see the improvement this series gives or are you hoping to compare it with some other mechanism? > If they are fine to merge w/o that, I am fine. As of now we have just > 1-2 platforms to test(that too not so simple to get started) and the > long term support for them are questionable. Why is the support for these platforms questionable? People are actively working on these platforms and the feature set constantly improving. > Also with SDM845 supporting PC, we have excellent opportunity to > compare and conclude the results found. That's correct, ATF exists for SDM845. But with the standard choice of firmware you will get OSI and I don't know of a board out there where you can switch between them and do a apple to apple comparison. Devices such as RB3 (96boards SDM845), Pixel3 and the Windows laptops are all OSI only. So landing this support is not a question of PC or OSI being the better choice, it's a question of do we want to be able to enter these lower power states - with the upstream kernel - on any past, present or future Qualcomm devices. Regards, Bjorn
WARNING: multiple messages have this Message-ID (diff)
From: Bjorn Andersson <bjorn.andersson@linaro.org> To: Sudeep Holla <sudeep.holla@arm.com> Cc: Mark Rutland <mark.rutland@arm.com>, Ulf Hansson <ulf.hansson@linaro.org>, Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>, Geert Uytterhoeven <geert+renesas@glider.be>, "Rafael J. Wysocki" <rafael@kernel.org>, Stephen Boyd <sboyd@kernel.org>, Viresh Kumar <viresh.kumar@linaro.org>, Linux PM <linux-pm@vger.kernel.org>, Daniel Lezcano <daniel.lezcano@linaro.org>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, Kevin Hilman <khilman@kernel.org>, Amit Kucheria <amit.kucheria@linaro.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Tony Lindgren <tony@atomide.com>, Lina Iyer <ilina@codeaurora.org>, linux-arm-msm <linux-arm-msm@vger.kernel.org>, Niklas Cassel <niklas.cassel@linaro.org>, Souvik Chakravarty <souvik.chakravarty@arm.com>, "Raju P . L . S . S . S . N" <rplsssn@codeaurora.org>, Linux ARM <linux-arm-kernel@lists.infradead.org> Subject: Re: [PATCH 00/18] ARM/ARM64: Support hierarchical CPU arrangement for PSCI Date: Fri, 7 Jun 2019 12:34:07 -0700 [thread overview] Message-ID: <20190607193407.GB24059@builder> (raw) In-Reply-To: <20190607154210.GJ15577@e107155-lin> On Fri 07 Jun 08:42 PDT 2019, Sudeep Holla wrote: > On Tue, May 14, 2019 at 10:58:04AM +0200, Ulf Hansson wrote: > > On Tue, 14 May 2019 at 10:08, Rafael J. Wysocki <rafael@kernel.org> wrote: > > > > > > On Mon, May 13, 2019 at 9:23 PM Ulf Hansson <ulf.hansson@linaro.org> wrote: > > > > > > > > This series enables support for hierarchical CPU arrangement, managed by PSCI > > > > for ARM/ARM64. It's based on using the generic PM domain (genpd), which > > > > recently was extended to manage devices belonging to CPUs. > > > > > > ACK for the patches touching cpuidle in this series (from the > > > framework perspective), but I'm assuming it to be taken care of by > > > ARM/ARM64 maintainers. > > > > Thanks for the ack! Yes, this is for PSCI/ARM maintainers. > > > > BTW, apologize for sending this in the merge window, but wanted to > > take the opportunity for people to have a look before OSPM Pisa next > > week. > > > > I will start looking at this series. But I would request PSCI/other > maintainers to wait until we see some comparison data before we merge. What comparison are you asking for here? Do you want to see the improvement this series gives or are you hoping to compare it with some other mechanism? > If they are fine to merge w/o that, I am fine. As of now we have just > 1-2 platforms to test(that too not so simple to get started) and the > long term support for them are questionable. Why is the support for these platforms questionable? People are actively working on these platforms and the feature set constantly improving. > Also with SDM845 supporting PC, we have excellent opportunity to > compare and conclude the results found. That's correct, ATF exists for SDM845. But with the standard choice of firmware you will get OSI and I don't know of a board out there where you can switch between them and do a apple to apple comparison. Devices such as RB3 (96boards SDM845), Pixel3 and the Windows laptops are all OSI only. So landing this support is not a question of PC or OSI being the better choice, it's a question of do we want to be able to enter these lower power states - with the upstream kernel - on any past, present or future Qualcomm devices. Regards, Bjorn _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-06-07 19:34 UTC|newest] Thread overview: 155+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-05-13 19:22 [PATCH 00/18] ARM/ARM64: Support hierarchical CPU arrangement for PSCI Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` [PATCH 01/18] dt: psci: Update DT bindings to support hierarchical PSCI states Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-07-19 11:29 ` Lorenzo Pieralisi 2019-07-19 11:29 ` Lorenzo Pieralisi 2019-05-13 19:22 ` [PATCH 02/18] of: base: Add of_get_cpu_state_node() to get idle states for a CPU node Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` [PATCH 03/18] cpuidle: dt: Support hierarchical CPU idle states Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` [PATCH 04/18] ARM/ARM64: cpuidle: Let back-end init ops take the driver as input Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-06-07 15:00 ` Sudeep Holla 2019-06-07 15:00 ` Sudeep Holla 2019-06-10 10:20 ` Ulf Hansson 2019-06-10 10:20 ` Ulf Hansson 2019-05-13 19:22 ` [PATCH 05/18] drivers: firmware: psci: Simplify state node parsing Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-06-07 15:01 ` Sudeep Holla 2019-06-07 15:01 ` Sudeep Holla 2019-05-13 19:22 ` [PATCH 06/18] drivers: firmware: psci: Support hierarchical CPU idle states Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-06-07 15:03 ` Sudeep Holla 2019-06-07 15:03 ` Sudeep Holla 2019-05-13 19:22 ` [PATCH 07/18] drivers: firmware: psci: Prepare to use OS initiated suspend mode Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-06-07 15:17 ` Sudeep Holla 2019-06-07 15:17 ` Sudeep Holla 2019-06-10 10:21 ` Ulf Hansson 2019-06-10 10:21 ` Ulf Hansson 2019-06-10 10:42 ` Sudeep Holla 2019-06-10 10:42 ` Sudeep Holla 2019-07-16 14:53 ` Sudeep Holla 2019-07-16 14:53 ` Sudeep Holla 2019-05-13 19:22 ` [PATCH 08/18] drivers: firmware: psci: Prepare to support PM domains Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-06-07 15:21 ` Sudeep Holla 2019-06-07 15:21 ` Sudeep Holla 2019-05-13 19:22 ` [PATCH 09/18] drivers: firmware: psci: Add support for PM domains using genpd Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-06-07 15:27 ` Sudeep Holla 2019-06-07 15:27 ` Sudeep Holla 2019-06-10 10:21 ` Ulf Hansson 2019-06-10 10:21 ` Ulf Hansson 2019-06-10 10:59 ` Sudeep Holla 2019-06-10 10:59 ` Sudeep Holla 2019-07-16 15:05 ` Sudeep Holla 2019-07-16 15:05 ` Sudeep Holla 2019-07-18 11:04 ` Ulf Hansson 2019-07-18 11:04 ` Ulf Hansson 2019-07-18 13:19 ` Sudeep Holla 2019-07-18 13:19 ` Sudeep Holla 2019-07-18 17:57 ` Lina Iyer 2019-07-18 17:57 ` Lina Iyer 2019-07-19 9:45 ` Sudeep Holla 2019-07-19 9:45 ` Sudeep Holla 2019-05-13 19:22 ` [PATCH 10/18] drivers: firmware: psci: Add hierarchical domain idle states converter Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-07-09 15:31 ` Lorenzo Pieralisi 2019-07-09 15:31 ` Lorenzo Pieralisi 2019-07-16 8:45 ` Ulf Hansson 2019-07-16 8:45 ` Ulf Hansson 2019-07-16 14:51 ` Lorenzo Pieralisi 2019-07-16 14:51 ` Lorenzo Pieralisi 2019-07-18 11:43 ` Ulf Hansson 2019-07-18 11:43 ` Ulf Hansson 2019-07-18 13:36 ` Lorenzo Pieralisi 2019-07-18 13:36 ` Lorenzo Pieralisi 2019-05-13 19:22 ` [PATCH 11/18] drivers: firmware: psci: Introduce psci_dt_topology_init() Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` [PATCH 12/18] drivers: firmware: psci: Add a helper to attach a CPU to its PM domain Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` [PATCH 13/18] drivers: firmware: psci: Attach the CPU's device " Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` [PATCH 14/18] drivers: firmware: psci: Manage runtime PM in the idle path for CPUs Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-07-16 15:53 ` Lorenzo Pieralisi 2019-07-16 15:53 ` Lorenzo Pieralisi 2019-07-18 10:35 ` Ulf Hansson 2019-07-18 10:35 ` Ulf Hansson 2019-07-18 13:30 ` Lorenzo Pieralisi 2019-07-18 13:30 ` Lorenzo Pieralisi 2019-07-18 16:54 ` Ulf Hansson 2019-07-18 16:54 ` Ulf Hansson 2019-07-18 17:41 ` Lina Iyer 2019-07-18 17:41 ` Lina Iyer 2019-07-18 21:49 ` Ulf Hansson 2019-07-18 21:49 ` Ulf Hansson 2019-07-19 10:02 ` Lorenzo Pieralisi 2019-07-19 10:02 ` Lorenzo Pieralisi 2019-05-13 19:22 ` [PATCH 15/18] drivers: firmware: psci: Support CPU hotplug for the hierarchical model Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-06-07 15:31 ` Sudeep Holla 2019-06-07 15:31 ` Sudeep Holla 2019-06-10 10:21 ` Ulf Hansson 2019-06-10 10:21 ` Ulf Hansson 2019-06-10 11:02 ` Sudeep Holla 2019-06-10 11:02 ` Sudeep Holla 2019-05-13 19:22 ` [PATCH 16/18] arm64: kernel: Respect the hierarchical CPU topology in DT for PSCI Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` [PATCH 17/18] arm64: dts: Convert to the hierarchical CPU topology layout for MSM8916 Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-05-13 19:22 ` Ulf Hansson 2019-07-16 14:47 ` Sudeep Holla 2019-07-16 14:47 ` Sudeep Holla 2019-07-16 20:36 ` Lina Iyer 2019-07-16 20:36 ` Lina Iyer 2019-07-17 17:18 ` Sudeep Holla 2019-07-17 17:18 ` Sudeep Holla 2019-05-13 19:23 ` [PATCH 18/18] arm64: dts: hikey: Convert to the hierarchical CPU topology layout Ulf Hansson 2019-05-13 19:23 ` Ulf Hansson 2019-05-13 19:23 ` Ulf Hansson 2019-07-16 14:47 ` Sudeep Holla 2019-07-16 14:47 ` Sudeep Holla 2019-07-18 10:48 ` Ulf Hansson 2019-07-18 10:48 ` Ulf Hansson 2019-07-18 13:11 ` Sudeep Holla 2019-07-18 13:11 ` Sudeep Holla 2019-05-14 8:08 ` [PATCH 00/18] ARM/ARM64: Support hierarchical CPU arrangement for PSCI Rafael J. Wysocki 2019-05-14 8:08 ` Rafael J. Wysocki 2019-05-14 8:08 ` Rafael J. Wysocki 2019-05-14 8:58 ` Ulf Hansson 2019-05-14 8:58 ` Ulf Hansson 2019-05-14 8:58 ` Ulf Hansson 2019-06-07 15:42 ` Sudeep Holla 2019-06-07 15:42 ` Sudeep Holla 2019-06-07 19:34 ` Bjorn Andersson [this message] 2019-06-07 19:34 ` Bjorn Andersson 2019-06-10 10:32 ` Sudeep Holla 2019-06-10 10:32 ` Sudeep Holla 2019-06-10 15:54 ` Ulf Hansson 2019-06-10 15:54 ` Ulf Hansson 2019-06-10 17:16 ` Lorenzo Pieralisi 2019-06-10 17:16 ` Lorenzo Pieralisi 2019-06-10 18:57 ` Ulf Hansson 2019-06-10 18:57 ` Ulf Hansson 2019-06-18 11:56 ` Ulf Hansson 2019-06-18 11:56 ` Ulf Hansson 2019-06-07 11:19 ` Ulf Hansson 2019-06-07 11:19 ` Ulf Hansson
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