From: "Moore, Robert" <robert.moore@intel.com>
To: Nikolaus Voss <nv@vosn.de>
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" <linux-acpi@vger.kernel.org>,
"devel@acpica.org" <devel@acpica.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ferry Toth <ftoth@telfort.nl>,
"nikolaus.voss@loewensteinmedical.de"
<nikolaus.voss@loewensteinmedical.de>
Subject: RE: [PATCH] ACPICA: make acpi_load_table() return table index
Date: Fri, 13 Sep 2019 14:20:21 +0000 [thread overview]
Message-ID: <94F2FBAB4432B54E8AACC7DFDE6C92E3B967ADF6@ORSMSX110.amr.corp.intel.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1909130911180.20316@fox.voss.local>
-----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". 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"));
The API change I request is not directly related to table unloading, it's just that the index of the loaded table is returned for future reference:
[...]
>> diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h index
>> 3845c8fcc94e5..c90bbdc4146a6 100644
>> --- a/include/acpi/acpixf.h
>> +++ b/include/acpi/acpixf.h
>> @@ -452,7 +452,8 @@ ACPI_EXTERNAL_RETURN_STATUS(acpi_status ACPI_INIT_FUNCTION
>> u8 physical))
>>
>> ACPI_EXTERNAL_RETURN_STATUS(acpi_status
>> - acpi_load_table(struct acpi_table_header *table))
>> + acpi_load_table(struct acpi_table_header *table,
>> + u32 *table_idx))
>>
>> ACPI_EXTERNAL_RETURN_STATUS(acpi_status
>> acpi_unload_parent_table(acpi_handle object))
>> --
>> 2.17.1
>>
This allows for a simple fix of the regression and doesn't imply future support for table unloading. Would this be acceptable?
Niko
next prev parent reply other threads:[~2019-09-13 14:20 UTC|newest]
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
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 [this message]
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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