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Groups > linux.kernel > #1624947
| From | "Zheng, Lv" <lv.zheng@intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | RE: [PATCH] ACPICA: Export mutex functions |
| Date | 2017-04-18 02:00 +0200 |
| Message-ID | <txoIN-7c0-1@gated-at.bofh.it> (permalink) |
| References | (3 earlier) <txbix-7rC-1@gated-at.bofh.it> <txheh-2tc-9@gated-at.bofh.it> <txitH-3pf-5@gated-at.bofh.it> <txkvw-4CU-5@gated-at.bofh.it> <txkOR-4K8-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Hi, > From: Guenter Roeck [mailto:linux@roeck-us.net] > Sent: Tuesday, April 18, 2017 3:45 AM > Subject: Re: [PATCH] ACPICA: Export mutex functions > > On Mon, Apr 17, 2017 at 07:27:37PM +0000, Moore, Robert wrote: > > > > > -----Original Message----- > > > From: Moore, Robert > > > Sent: Monday, April 17, 2017 10:13 AM > > > To: Guenter Roeck <linux@roeck-us.net>; Zheng, Lv <lv.zheng@intel.com> > > > Cc: Wysocki, Rafael J <rafael.j.wysocki@intel.com>; Len Brown > > > <lenb@kernel.org>; linux-acpi@vger.kernel.org; devel@acpica.org; linux- > > > kernel@vger.kernel.org > > > Subject: RE: [PATCH] ACPICA: Export mutex functions > > > > > > There is a model for the drivers to directly acquire an AML mutex > > > object. That is why the acquire/release public interfaces were added to > > > ACPICA. > > > > > > I forget all of the details, but the model was developed with MS and > > > others during the ACPI 6.0 timeframe. > > > > > > > > [Moore, Robert] > > > > > > Here is the case where the OS may need to directly acquire an AML mutex: > > > > From the ACPI spec: > > > > 19.6.2 Acquire (Acquire a Mutex) > > > > Note: For Mutex objects referenced by a _DLM object, the host OS may also contend for ownership. > > > From the context in the dsdt, and from description of expected use cases for > _DLM objects I can find, this is what the mutex is used for (to serialize > access to a resource on a low pin count serial interconnect, aka LPC). > > What does that mean in practice ? That I am not supposed to use it because > it doesn't follow standard ACPI mutex declaration rules ? > Could you find related _DLMs in your DSDT? If there is any, could you please post it here for reference? Thanks Lv > Thanks, > Guenter > > > > > > > > > Other than this case, the OS/drivers should never need to directly acquire an AML mutex. > > Bob > >
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[PATCH] ACPICA: Export mutex functions Guenter Roeck <linux@roeck-us.net> - 2017-04-12 17:20 +0200
RE: [PATCH] ACPICA: Export mutex functions "Moore, Robert" <robert.moore@intel.com> - 2017-04-12 17:40 +0200
Re: [PATCH] ACPICA: Export mutex functions Guenter Roeck <linux@roeck-us.net> - 2017-04-12 23:30 +0200
RE: [PATCH] ACPICA: Export mutex functions "Moore, Robert" <robert.moore@intel.com> - 2017-04-13 00:00 +0200
Re: [PATCH] ACPICA: Export mutex functions Guenter Roeck <linux@roeck-us.net> - 2017-04-13 03:00 +0200
Re: [PATCH] ACPICA: Export mutex functions "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-04-15 00:40 +0200
RE: [PATCH] ACPICA: Export mutex functions "Moore, Robert" <robert.moore@intel.com> - 2017-04-15 01:40 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-17 11:40 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-17 11:50 +0200
Re: [PATCH] ACPICA: Export mutex functions Guenter Roeck <linux@roeck-us.net> - 2017-04-17 16:10 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-18 01:40 +0200
Re: [PATCH] ACPICA: Export mutex functions Guenter Roeck <linux@roeck-us.net> - 2017-04-17 18:00 +0200
RE: [PATCH] ACPICA: Export mutex functions "Moore, Robert" <robert.moore@intel.com> - 2017-04-17 19:20 +0200
RE: [PATCH] ACPICA: Export mutex functions "Moore, Robert" <robert.moore@intel.com> - 2017-04-17 21:30 +0200
Re: [PATCH] ACPICA: Export mutex functions Guenter Roeck <linux@roeck-us.net> - 2017-04-17 21:50 +0200
RE: [PATCH] ACPICA: Export mutex functions "Moore, Robert" <robert.moore@intel.com> - 2017-04-17 22:50 +0200
Re: [PATCH] ACPICA: Export mutex functions Guenter Roeck <linux@roeck-us.net> - 2017-04-17 23:10 +0200
Re: [PATCH] ACPICA: Export mutex functions "Rafael J. Wysocki" <rafael@kernel.org> - 2017-04-17 23:30 +0200
Re: [PATCH] ACPICA: Export mutex functions Guenter Roeck <linux@roeck-us.net> - 2017-04-18 00:40 +0200
Re: [PATCH] ACPICA: Export mutex functions "Rafael J. Wysocki" <rafael@kernel.org> - 2017-04-18 01:00 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-18 02:00 +0200
Re: [PATCH] ACPICA: Export mutex functions Guenter Roeck <linux@roeck-us.net> - 2017-04-18 06:40 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-18 09:10 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-18 09:20 +0200
Re: [PATCH] ACPICA: Export mutex functions Guenter Roeck <linux@roeck-us.net> - 2017-04-18 16:00 +0200
Re: [PATCH] ACPICA: Export mutex functions "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2017-04-18 16:30 +0200
RE: [PATCH] ACPICA: Export mutex functions "Moore, Robert" <robert.moore@intel.com> - 2017-04-18 18:10 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-19 03:30 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-19 03:40 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-18 02:00 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-18 01:50 +0200
RE: [PATCH] ACPICA: Export mutex functions "Moore, Robert" <robert.moore@intel.com> - 2017-04-17 21:40 +0200
RE: [PATCH] ACPICA: Export mutex functions "Zheng, Lv" <lv.zheng@intel.com> - 2017-04-18 01:40 +0200
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