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From: Nikolaus Voss <nv@vosn.de>
To: "Shevchenko, Andriy" <andriy.shevchenko@intel.com>
Cc: "Schmauss, Erik" <erik.schmauss@intel.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>,
	"Moore, Robert" <robert.moore@intel.com>,
	Jacek Anaszewski <jacek.anaszewski@gmail.com>,
	Pavel Machek <pavel@ucw.cz>, Dan Murphy <dmurphy@ti.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	"devel@acpica.org" <devel@acpica.org>,
	"linux-leds@vger.kernel.org" <linux-leds@vger.kernel.org>,
	"linux-pwm@vger.kernel.org" <linux-pwm@vger.kernel.org>
Subject: Re: [PATCH 1/3] ACPI: Resolve objects on host-directed table loads
Date: Wed, 4 Sep 2019 09:20:03 +0200 (CEST)
Message-ID: <alpine.DEB.2.20.1909040913230.15999@fox.voss.local> (raw)
In-Reply-To: <20190830145348.GM2680@smile.fi.intel.com>

Andy,

On Fri, 30 Aug 2019, Shevchenko, Andriy wrote:
> On Fri, Aug 16, 2019 at 01:57:26PM +0200, Nikolaus Voss wrote:
>> On Wed, 14 Aug 2019, Schmauss, Erik wrote:
>>>> -----Original Message-----
>>>> From: Shevchenko, Andriy
>>>> Sent: Wednesday, August 14, 2019 11:51 AM
>>>> To: Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>
>>>> Cc: Rafael J. Wysocki <rjw@rjwysocki.net>; Len Brown <lenb@kernel.org>;
>>>> Moore, Robert <robert.moore@intel.com>; Schmauss, Erik
>>>> <erik.schmauss@intel.com>; Jacek Anaszewski <jacek.anaszewski@gmail.com>;
>>>> Pavel Machek <pavel@ucw.cz>; Dan Murphy <dmurphy@ti.com>; Thierry
>>>> Reding <thierry.reding@gmail.com>; linux-acpi@vger.kernel.org;
>>>> devel@acpica.org; linux-leds@vger.kernel.org; linux-pwm@vger.kernel.org
>>>> Subject: Re: [PATCH 1/3] ACPI: Resolve objects on host-directed table loads
>>>>
>>>> On Wed, May 29, 2019 at 02:18:20PM +0200, Nikolaus Voss wrote:
>>>>> If an ACPI SSDT overlay is loaded after built-in tables have been
>>>>> loaded e.g. via configfs or efivar_ssdt_load() it is necessary to
>>>>> rewalk the namespace to resolve references. Without this, relative and
>>>>> absolute paths like ^PCI0.SBUS or \_SB.PCI0.SBUS are not resolved
>>>>> correctly.
>>>>>
>>>>> Make configfs load use the same method as efivar_ssdt_load().
>>>>
>>>> This patch brought a regression (bisect log below).
>>>> Now I'm unable to unload the table which was working before.
>>>>
>>>> Reverting (manual, due to ACPICA changes) helps.
>>>>
>>>> Please, consider to revert for this cycle, or fix. I will be glad to test any
>>>> proposed fix.
>>>
>>> We submitted a patch (d1fb5b2f623b1af5a0d2a83d205df1b61f430dc6)
>>> in response to this suggestion and I was not aware that this had been applied.
>>>
>>> Rafael, please revert at least the ACPICA portion of this patch.
>>
>> As I see it, my ACPICA change is not part of 5.3-rc1 any more. Reverting my
>> fix is part of the patch above (d1fb5b2f623b1af5a0d2a83d205df1b61f430dc6)
>> which is already applied.
>>
>> Nevertheless, what is new, is that acpi_ns_initialize_objects() is called in
>> acpi_load_table(). This is necessary to resolve the references in the newly
>> loaded table. Maybe this prevents the table from being unloaded?
>
> So, can we do something about it? It's a regression.
>
> Rafael, Nikolaus?

can you describe how you unload the table (from userspace?). I cannot 
reproduce this regression. I was not aware of any working interface for 
unloading ACPI tables, I ended up in kexec'ing the kernel for my tests 
each time I had to unload a table.

Niko

  reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-29 12:18 [PATCH 0/3] PWM framework: add support referencing PWMs from ACPI Nikolaus Voss
2019-05-29 12:18 ` [PATCH 1/3] ACPI: Resolve objects on host-directed table loads Nikolaus Voss
2019-05-30 14:42   ` Dan Murphy
2019-05-31 12:23     ` Pavel Machek
2019-05-31 12:45       ` Dan Murphy
2019-05-31 12:46     ` Dan Murphy
2019-06-03  9:12       ` Nikolaus Voss
2019-08-14 18:50   ` Andy Shevchenko
2019-08-14 20:27     ` Schmauss, Erik
2019-08-16 11:57       ` Nikolaus Voss
2019-08-30 14:53         ` Shevchenko, Andriy
2019-09-04  7:20           ` Nikolaus Voss [this message]
2019-09-06 17:46             ` Shevchenko, Andriy
2019-09-12  8:05               ` Nikolaus Voss
2019-09-12  8:07               ` [PATCH] ACPICA: make acpi_load_table() return table index Nikolaus Voss
2019-09-12 14:19                 ` Moore, Robert
2019-09-12 19:36                   ` Ferry Toth
2019-09-25 18:13                     ` Schmauss, Erik
2019-09-26  8:09                       ` Shevchenko, Andriy
2019-09-13  7:44                   ` Nikolaus Voss
2019-09-13 14:20                     ` Moore, Robert
2019-09-13 15:12                       ` Shevchenko, Andriy
2019-09-13 16:48                         ` Ferry Toth
2019-09-13 16:48                           ` Ferry Toth
2019-09-13 17:40                           ` Moore, Robert
2019-09-13 19:56                             ` Rafael J. Wysocki
2019-09-16  9:46                             ` Nikolaus Voss
2019-09-18 14:13                               ` Moore, Robert
2019-09-18 14:31                                 ` Nikolaus Voss
2019-09-19 17:05                                   ` Moore, Robert
2019-09-23  9:05                                     ` Nikolaus Voss
2019-09-24 19:41                                       ` Moore, Robert
2019-09-25 10:18                                         ` Nikolaus Voss
2019-09-25 10:53                                           ` Shevchenko, Andriy
2019-09-19  8:13                 ` Rafael J. Wysocki
2019-09-23  9:08                   ` Nikolaus Voss
2019-09-23  9:47                   ` [PATCH] ACPICA: Introduce acpi_load_table_with_index() Nikolaus Voss
2019-09-24 12:07                     ` Shevchenko, Andriy
2019-09-24 12:08                       ` Shevchenko, Andriy
2019-09-25 10:20                         ` Nikolaus Voss
2019-09-24 15:11                     ` Andy Shevchenko
2019-09-25 10:22                       ` Nikolaus Voss
2019-09-26 16:09                 ` [PATCH] ACPICA: make acpi_load_table() return table index Schmauss, Erik
2019-09-26 16:35                   ` Shevchenko, Andriy
2019-09-26 16:51                     ` Schmauss, Erik
2019-09-26 17:47                       ` Shevchenko, Andriy
2019-09-26 18:44                       ` Nikolaus Voss
2019-09-26 19:26                         ` Rafael J. Wysocki
2019-09-26 19:41                           ` Schmauss, Erik
2019-09-26 18:43                   ` Nikolaus Voss
2019-05-29 12:18 ` [PATCH 2/3] PWM framework: add support referencing PWMs from ACPI Nikolaus Voss
2019-05-30 14:54   ` Dan Murphy
2019-05-31 12:24     ` Pavel Machek
2019-06-03  9:27     ` Nikolaus Voss
2019-05-29 12:18 ` [PATCH 3/3] leds-pwm.c: support ACPI via firmware-node framework Nikolaus Voss
2019-05-30 15:14   ` Dan Murphy
2019-06-03  9:44     ` Nikolaus Voss

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