From: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org> To: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>, Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org> Cc: "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>, Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org> Subject: Re: ACPI vs DT at runtime Date: Wed, 20 Nov 2013 13:49:42 +0000 [thread overview] Message-ID: <20131120134942.95DBFC4079D@trevor.secretlab.ca> (raw) In-Reply-To: <20131115095717.GC1709-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> On Fri, 15 Nov 2013 09:57:17 +0000, Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org> wrote: > On Fri, Nov 15, 2013 at 01:44:10AM +0000, Olof Johansson wrote: > > The more I start to see early UEFI/ACPI code, the more I am certain > > that we want none of that crap in the kernel. It's making things > > considerably messier, while we're already very busy trying to convert > > everything over and enable DT -- we'll be preempting that effort just > > to add even more boilerplate everywhere and total progress will be > > hurt. > > We are certainly under a lot of pressure with the device tree migration, > and I agree that adding another information source is going to be a > source of pain. However, I'd argue that we're going to encounter pain > regardless of which approach we take. > > I'm of the opinion that the only way we should support ACPI is as a > first-class citizen. We don't need to modify every driver and subsystem > to support ACPI, only those necessary to support the minimal set of > platforms using ACPI. ACPI is new in the arm space, and we can enforce > quality standards on ACPI _now_ above what we're allowing for DT, and > avoid future problems. Translated ACPI tables really don't make any sense at all. While the models are similar in some regards, they are very different in others and any translator (I suspect) would become very complicated to deal with all the edge cases. > I'm not sure that translating ACPI tables to dt makes any sense. If AML > is used (even sparingly), I do not believe that we can do any sensible > conversion to device tree. My understanding is that AML includes > functionality for modifying ACPI tables, and I don't see how we can > possibly support that without having to add a lot of boilerplate to all > the code handling AML to add a device tree backend... The dynamic features of AML would be a no-go. Basically, an AML method can cause SSDT blocks to be loaded/unloaded at runtime. It doesn't edit the tree provided at runtime, but it does augment it. g. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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From: grant.likely@secretlab.ca (Grant Likely) To: linux-arm-kernel@lists.infradead.org Subject: ACPI vs DT at runtime Date: Wed, 20 Nov 2013 13:49:42 +0000 [thread overview] Message-ID: <20131120134942.95DBFC4079D@trevor.secretlab.ca> (raw) In-Reply-To: <20131115095717.GC1709@e106331-lin.cambridge.arm.com> On Fri, 15 Nov 2013 09:57:17 +0000, Mark Rutland <mark.rutland@arm.com> wrote: > On Fri, Nov 15, 2013 at 01:44:10AM +0000, Olof Johansson wrote: > > The more I start to see early UEFI/ACPI code, the more I am certain > > that we want none of that crap in the kernel. It's making things > > considerably messier, while we're already very busy trying to convert > > everything over and enable DT -- we'll be preempting that effort just > > to add even more boilerplate everywhere and total progress will be > > hurt. > > We are certainly under a lot of pressure with the device tree migration, > and I agree that adding another information source is going to be a > source of pain. However, I'd argue that we're going to encounter pain > regardless of which approach we take. > > I'm of the opinion that the only way we should support ACPI is as a > first-class citizen. We don't need to modify every driver and subsystem > to support ACPI, only those necessary to support the minimal set of > platforms using ACPI. ACPI is new in the arm space, and we can enforce > quality standards on ACPI _now_ above what we're allowing for DT, and > avoid future problems. Translated ACPI tables really don't make any sense at all. While the models are similar in some regards, they are very different in others and any translator (I suspect) would become very complicated to deal with all the edge cases. > I'm not sure that translating ACPI tables to dt makes any sense. If AML > is used (even sparingly), I do not believe that we can do any sensible > conversion to device tree. My understanding is that AML includes > functionality for modifying ACPI tables, and I don't see how we can > possibly support that without having to add a lot of boilerplate to all > the code handling AML to add a device tree backend... The dynamic features of AML would be a no-go. Basically, an AML method can cause SSDT blocks to be loaded/unloaded at runtime. It doesn't edit the tree provided at runtime, but it does augment it. g.
next prev parent reply other threads:[~2013-11-20 13:49 UTC|newest] Thread overview: 186+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-11-15 1:44 ACPI vs DT at runtime Olof Johansson 2013-11-15 1:44 ` Olof Johansson 2013-11-15 9:57 ` Mark Rutland 2013-11-15 9:57 ` Mark Rutland [not found] ` <20131115175241. GB27174@quad.lixom.net> [not found] ` <20131115095717.GC1709-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2013-11-15 17:52 ` Olof Johansson 2013-11-15 17:52 ` Olof Johansson 2013-11-15 18:13 ` David Goodenough 2013-11-21 16:15 ` Grant Likely 2013-11-18 17:47 ` Jon Masters 2013-11-18 17:47 ` Jon Masters [not found] ` <20131115175241.GB27174-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-15 18:08 ` Russell King - ARM Linux 2013-11-15 18:08 ` Russell King - ARM Linux [not found] ` <20131115180832.GR16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-15 18:42 ` Olof Johansson 2013-11-15 18:42 ` Olof Johansson 2013-11-15 19:56 ` Arnd Bergmann 2013-11-15 19:56 ` Arnd Bergmann [not found] ` <201311152056.47846.arnd-r2nGTMty4D4@public.gmane.org> 2013-11-15 23:21 ` Russell King - ARM Linux 2013-11-15 23:21 ` Russell King - ARM Linux [not found] ` <20131115232109.GT16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-18 15:05 ` Arnd Bergmann 2013-11-18 15:05 ` Arnd Bergmann [not found] ` <201311181605.37300.arnd-r2nGTMty4D4@public.gmane.org> 2013-11-18 15:19 ` Russell King - ARM Linux 2013-11-18 15:19 ` Russell King - ARM Linux 2013-11-18 15:46 ` Arnd Bergmann 2013-11-18 15:46 ` Arnd Bergmann 2013-11-21 16:10 ` Grant Likely 2013-11-21 16:10 ` Grant Likely [not found] ` <20131121161037.C528CC406A3-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org> 2013-11-21 18:26 ` Arnd Bergmann 2013-11-21 18:26 ` Arnd Bergmann 2013-11-21 19:40 ` Mark Brown 2013-11-21 19:40 ` Mark Brown [not found] ` <20131118151900.GF16735@ n2100.arm.linux.org.uk> [not found] ` <20131118151900.GF16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-21 16:11 ` Grant Likely 2013-11-21 16:11 ` Grant Likely 2013-11-21 16:00 ` Grant Likely 2013-11-21 16:00 ` Grant Likely 2013-11-19 11:30 ` Mark Rutland 2013-11-19 11:30 ` Mark Rutland 2013-11-19 11:35 ` Mark Rutland 2013-11-19 11:35 ` Mark Rutland [not found] ` <20131119113557.GI5914-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2013-11-19 11:51 ` Leif Lindholm 2013-11-19 11:51 ` Leif Lindholm [not found] ` <20131119113015.GH5914-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2013-11-19 11:57 ` Russell King - ARM Linux 2013-11-19 11:57 ` Russell King - ARM Linux 2013-11-19 13:56 ` Stefano Stabellini 2013-11-19 13:56 ` Stefano Stabellini 2013-11-19 14:38 ` Mark Rutland 2013-11-19 14:38 ` Mark Rutland [not found] ` <20131119143840.GN5914-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2013-11-19 14:59 ` Leif Lindholm 2013-11-19 14:59 ` Leif Lindholm 2013-11-19 18:23 ` Olof Johansson 2013-11-19 18:23 ` Olof Johansson 2013-11-19 14:05 ` Arnd Bergmann 2013-11-19 14:05 ` Arnd Bergmann 2013-11-19 15:21 ` Mark Rutland 2013-11-19 15:21 ` Mark Rutland [not found] ` <20131119152157.GO5914-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2013-11-19 16:19 ` Arnd Bergmann 2013-11-19 16:19 ` Arnd Bergmann 2013-11-19 18:34 ` Olof Johansson 2013-11-19 18:34 ` Olof Johansson 2013-11-19 19:06 ` Tom Rini 2013-11-19 19:06 ` Tom Rini 2013-11-19 18:19 ` Olof Johansson 2013-11-19 18:19 ` Olof Johansson [not found] ` <20131119181959.GA20967-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-21 16:37 ` Grant Likely 2013-11-21 16:37 ` Grant Likely 2013-11-21 16:29 ` Grant Likely 2013-11-21 16:29 ` Grant Likely [not found] ` <20131121170122. GB22960@srcf.ucam.org> [not found] ` <20131121170122.GB22960-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org> 2013-11-21 18:38 ` Grant Likely 2013-11-21 18:38 ` Grant Likely [not found] ` <20131121162944.F087FC406A3-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org> 2013-11-21 17:01 ` Matthew Garrett 2013-11-21 17:01 ` Matthew Garrett 2013-11-21 17:58 ` Olof Johansson 2013-11-21 17:58 ` Olof Johansson [not found] ` <20131121175822.GA9590-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-21 18:19 ` Matthew Garrett 2013-11-21 18:19 ` Matthew Garrett 2013-11-21 18:33 ` Arnd Bergmann 2013-11-21 18:33 ` Arnd Bergmann 2013-11-21 18:54 ` Russell King - ARM Linux 2013-11-21 18:54 ` Russell King - ARM Linux [not found] ` <20131121185408.GX16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-21 18:59 ` Olof Johansson 2013-11-21 18:59 ` Olof Johansson [not found] ` <CAOesGMgzUSMDy99XojipfRd5OM88UhfbCYO0aoc5m-Q8Fwnddg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-21 19:01 ` Russell King - ARM Linux 2013-11-21 19:01 ` Russell King - ARM Linux [not found] ` <20131121190126.GZ16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-21 19:31 ` Olof Johansson 2013-11-21 19:31 ` Olof Johansson [not found] ` < CAOesGMgzUSMDy99XojipfRd5OM88UhfbCYO0aoc5m-Q8Fwnddg@mail.gmail.com> [not found] ` < 20131121190126.GZ16735@n2100.arm.linux.org.uk> [not found] ` < CAOesGMgxGq1Zmo+Dq-Rmy2F02-=12yUzB0AKn35yK2j3CacNRQ@mail.gmail.com> [not found] ` <CAOesGMgxGq1Zmo+Dq-Rmy2F02-=12yUzB0AKn35yK2j3CacNRQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-21 20:44 ` Grant Likely 2013-11-21 20:44 ` Grant Likely 2013-11-21 18:53 ` Mark Brown 2013-11-21 18:53 ` Mark Brown 2013-11-15 18:28 ` Jason Gunthorpe 2013-11-15 18:28 ` Jason Gunthorpe [not found] ` <20131115182826.GB14920-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> 2013-11-15 18:57 ` Arnd Bergmann 2013-11-15 18:57 ` Arnd Bergmann 2013-11-20 13:49 ` Grant Likely [this message] 2013-11-20 13:49 ` Grant Likely [not found] ` <20131120134942.95DBFC4079D-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org> 2013-11-20 17:43 ` Stefano Stabellini 2013-11-20 17:43 ` Stefano Stabellini [not found] ` <alpine.DEB.2.02.1311201737410.3198-7Z66fg9igcxYtxbxJUhB2Dgeux46jI+i@public.gmane.org> 2013-11-20 17:47 ` Olof Johansson 2013-11-20 17:47 ` Olof Johansson 2013-11-18 5:19 ` Jon Masters 2013-11-18 5:26 ` Jon Masters [not found] ` <5289A4F3.5040203-Zp4isUonpHBD60Wz+7aTrA@public.gmane.org> 2013-11-18 19:25 ` Olof Johansson 2013-11-18 19:25 ` Olof Johansson [not found] ` <20131118192552.GD5886-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-18 20:43 ` Jon Masters 2013-11-18 20:43 ` Jon Masters [not found] ` <528A7BFD.4020303-Zp4isUonpHBD60Wz+7aTrA@public.gmane.org> 2013-11-18 21:25 ` Olof Johansson 2013-11-18 21:25 ` Olof Johansson 2013-11-18 7:22 ` Richard Cochran 2013-11-18 13:55 ` Stefano Stabellini 2013-11-18 15:00 ` Mark Brown [not found] ` <20131118150052.GC24408-GFdadSzt00ze9xe1eoZjHA@public.gmane.org> 2013-11-18 19:13 ` Olof Johansson 2013-11-18 19:13 ` Olof Johansson [not found] ` <20131118191336.GB5886-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-19 9:12 ` Richard Cochran 2013-11-19 9:12 ` Richard Cochran 2013-11-19 18:48 ` Olof Johansson 2013-11-19 18:48 ` Olof Johansson [not found] ` <20131119184827.GD20967-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-20 6:40 ` Richard Cochran 2013-11-20 6:40 ` Richard Cochran 2013-11-21 18:16 ` Grant Likely 2013-11-21 18:16 ` Grant Likely 2013-11-21 19:21 ` Russell King - ARM Linux 2013-11-21 19:21 ` Russell King - ARM Linux [not found] ` < 20131121192136.GA16735@n2100.arm.linux.org.uk> [not found] ` <20131121192136.GA16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-21 20:47 ` Grant Likely 2013-11-21 20:47 ` Grant Likely [not found] ` <20131121204704.E4487C40753-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org> 2013-11-22 11:43 ` Catalin Marinas 2013-11-22 11:43 ` Catalin Marinas [not found] ` <CAHkRjk5MstjD9JFk+co8k89i8geJBmSF6uObhGdmWSe0GJHo8g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-22 12:00 ` Pantelis Antoniou 2013-11-22 12:00 ` Pantelis Antoniou [not found] ` <97692EF2-013E-4E4B-BC16-E0915D67EFEC-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org> 2014-05-05 7:06 ` Alexander Holler 2014-05-05 7:06 ` Alexander Holler [not found] ` <53673866.9000105-SXC+2es9fhnfWeYVQQPykw@public.gmane.org> 2014-05-05 14:41 ` Arnd Bergmann 2014-05-05 14:41 ` Arnd Bergmann 2014-05-05 15:29 ` Alexander Holler 2014-05-05 15:29 ` Alexander Holler [not found] ` <5367AE6B.3010105-SXC+2es9fhnfWeYVQQPykw@public.gmane.org> 2014-05-05 17:29 ` Arnd Bergmann 2014-05-05 17:29 ` Arnd Bergmann 2014-05-06 15:37 ` Grant Likely 2014-05-06 15:37 ` Grant Likely 2014-05-06 15:27 ` Grant Likely 2014-05-06 15:27 ` Grant Likely [not found] ` <20140506152725.E5B90C40959-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org> 2014-05-06 16:32 ` Olof Johansson 2014-05-06 16:32 ` Olof Johansson 2013-11-18 15:28 ` Rob Herring [not found] ` <5289A356.4060004-Zp4isUonpHBD60Wz+7aTrA@public.gmane.org> 2013-11-18 19:09 ` Olof Johansson 2013-11-18 19:09 ` Olof Johansson [not found] ` <20131118190929.GA5886-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-18 20:54 ` Jon Masters 2013-11-18 20:54 ` Jon Masters [not found] ` <528A7EA0.9050101-Zp4isUonpHBD60Wz+7aTrA@public.gmane.org> 2013-11-18 21:50 ` Olof Johansson 2013-11-18 21:50 ` Olof Johansson 2013-11-18 21:32 ` Grant Likely 2013-11-18 21:32 ` Grant Likely 2013-11-18 22:47 ` David Goodenough 2013-11-19 12:48 ` Arnd Bergmann 2013-11-19 12:48 ` Arnd Bergmann 2013-11-19 13:34 ` David Goodenough 2013-11-19 16:52 ` Arnd Bergmann 2013-11-21 18:23 ` Grant Likely 2013-11-19 14:33 ` Grant Likely [not found] ` <CAOesGMjKeRb=fFJM0MabDihbEiCGM4EqW9D5i_6-RFxTnpB4Qw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-15 20:58 ` Arnd Bergmann 2013-11-15 20:58 ` Arnd Bergmann [not found] ` <201311152158.32644.arnd-r2nGTMty4D4@public.gmane.org> 2013-11-15 21:44 ` Olof Johansson 2013-11-15 21:44 ` Olof Johansson [not found] ` <CAOesGMhkCn2zeJj_ZZAZu_wJya-4evWEqNHpVJEpjxzWHVWY3A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-17 17:18 ` Stefano Stabellini 2013-11-17 17:18 ` Stefano Stabellini [not found] ` <alpine.DEB.2.02.1311171705130.4714-7Z66fg9igcxYtxbxJUhB2Dgeux46jI+i@public.gmane.org> 2013-11-17 18:10 ` Arnd Bergmann 2013-11-17 18:10 ` Arnd Bergmann [not found] ` < CAOesGMiYyOcvr3Aqs-p8zc=XDwJM9NZtNxtxrTZssc6F=siZCw@mail.gmail.com> 2013-11-17 22:20 ` Olof Johansson 2013-11-17 22:20 ` Olof Johansson [not found] ` <CAOesGMiYyOcvr3Aqs-p8zc=XDwJM9NZtNxtxrTZssc6F=siZCw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-18 8:45 ` Arnd Bergmann 2013-11-18 8:45 ` Arnd Bergmann 2013-11-18 17:33 ` Jon Masters 2013-11-18 17:38 ` Russell King - ARM Linux [not found] ` <528A4F5F.7080104-Zp4isUonpHBD60Wz+7aTrA@public.gmane.org> 2013-11-18 19:21 ` Olof Johansson 2013-11-18 19:21 ` Olof Johansson 2013-11-21 18:26 ` Grant Likely 2013-11-18 15:04 ` Mark Brown 2013-11-18 15:04 ` Mark Brown 2013-11-18 15:10 ` Arnd Bergmann 2013-11-18 15:10 ` Arnd Bergmann [not found] ` < 201311181610.33105.arnd@arndb.de> [not found] ` <201311181610.33105.arnd-r2nGTMty4D4@public.gmane.org> 2013-11-18 21:38 ` Grant Likely 2013-11-18 21:38 ` Grant Likely 2013-11-18 23:25 ` Leif Lindholm 2013-11-18 23:25 ` Leif Lindholm [not found] ` <20131118232536.GF1567-GZEopFhza0F985/tl1ce8aaDwS/vmuI7@public.gmane.org> 2013-11-18 23:29 ` Olof Johansson 2013-11-18 23:29 ` Olof Johansson [not found] ` <CAOesGMh373ZsLzoGHJm+xV3uFVjh2CBSA8SXY4PA+VxL3a5W1w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-18 23:34 ` Leif Lindholm 2013-11-18 23:34 ` Leif Lindholm
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