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From: Ferry Toth <fntoth@gmail.com>
To: "Shevchenko, Andriy" <andriy.shevchenko@intel.com>,
	"Moore, Robert" <robert.moore@intel.com>
Cc: Nikolaus Voss <nv@vosn.de>,
	"Schmauss, Erik" <erik.schmauss@intel.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Len Brown <lenb@kernel.org>,
	Jacek Anaszewski <jacek.anaszewski@gmail.com>,
	Pavel Machek <pavel@ucw.cz>, Dan Murphy <dmurphy@ti.com>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	"devel@acpica.org" <devel@acpica.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"nikolaus.voss@loewensteinmedical.de" 
	<nikolaus.voss@loewensteinmedical.de>,
	Jan Kiszka <jan.kiszka@siemens.com>
Subject: Re: [PATCH] ACPICA: make acpi_load_table() return table index
Date: Fri, 13 Sep 2019 18:48:28 +0200
Message-ID: <7625fe37-1710-056d-fb9e-39c33fd962a1@gmail.com> (raw)
Message-ID: <20190913164828.vIv6oVvATdWPyJew4RVM7O2NrIslsawg4E-9jn89lFE@z> (raw)
In-Reply-To: <20190913151228.GT2680@smile.fi.intel.com>

Hello all,

Sorry to have sent our message with cancelled e-mail address. I have 
correct this now.

Op 13-09-19 om 17:12 schreef Shevchenko, Andriy:
> On Fri, Sep 13, 2019 at 05:20:21PM +0300, Moore, Robert wrote:
>> -----Original Message-----
>> From: Nikolaus Voss [mailto:nv@vosn.de]
>> Sent: Friday, September 13, 2019 12:44 AM
>> To: Moore, Robert <robert.moore@intel.com>
>> Cc: Shevchenko, Andriy <andriy.shevchenko@intel.com>; Schmauss, Erik <erik.schmauss@intel.com>; Rafael J. Wysocki <rjw@rjwysocki.net>; Len Brown <lenb@kernel.org>; Jacek Anaszewski <jacek.anaszewski@gmail.com>; Pavel Machek <pavel@ucw.cz>; Dan Murphy <dmurphy@ti.com>; linux-acpi@vger.kernel.org; devel@acpica.org; linux-kernel@vger.kernel.org; Ferry Toth <ftoth@telfort.nl>; nikolaus.voss@loewensteinmedical.de
>> Subject: RE: [PATCH] ACPICA: make acpi_load_table() return table index
>>
>> Bob,
>>
>> On Thu, 12 Sep 2019, Moore, Robert wrote:
>>> The ability to unload an ACPI table (especially AML tables such as
>>> SSDTs) is in the process of being deprecated in ACPICA -- since it is
>>> also deprecated in the current ACPI specification. This is being done
>>> because of the difficulty of deleting the namespace entries for the
>>> table.  FYI, Windows does not properly support this function either.
>>
>> ok, I see it can be a problem to unload an AML table with all it's consequences e.g. with respect to driver unregistering in setups with complex dependencies. It will only work properly under certain conditions
>> - nevertheless acpi_tb_unload_table() is still exported in ACPICA and we should get this working as it worked before.
>>
>> AcpiTbUnloadTable is not exported, it is an internal interface only -- as
>> recognized by the "AcpiTb".
> 
> In Linux it became a part of ABI when the
> 
> commit 772bf1e2878ecfca0d1f332071c83e021dd9cf01
> Author: Jan Kiszka <jan.kiszka@siemens.com>
> Date:   Fri Jun 9 20:36:31 2017 +0200
> 
>      ACPI: configfs: Unload SSDT on configfs entry removal
> 
> appeared in the kernel.

And the commit message explains quite well why it is an important feature:

"This allows to change SSDTs without rebooting the system.
It also allows to destroy devices again that a dynamically loaded SSDT
created.

This is widely similar to the DT overlay behavior."

>> I'm not sure that I want to change the interface
>> to AcpiLoadTable just for something that is being deprecated. Already, we
>> throw an ACPI_EXCEPTION if the Unload operator is encountered in the AML byte
>> stream. The same thing with AcpiUnloadParentTable - it is being deprecated.
>>
>>      ACPI_EXCEPTION ((AE_INFO, AE_NOT_IMPLEMENTED,
>>          "AML Unload operator is not supported"));
> 


  reply index

Thread overview: 34+ 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
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
2019-09-13  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 [this message]
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
2019-05-29 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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