From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: "Moore, Robert" <robert.moore@intel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>,
"mathias.nyman@linux.intel.com" <mathias.nyman@linux.intel.com>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"lenb@kernel.org" <lenb@kernel.org>,
"Wysocki, Rafael J" <rafael.j.wysocki@intel.com>,
"broonie@opensource.wolfsonmicro.com"
<broonie@opensource.wolfsonmicro.com>,
"grant.likely@secretlab.ca" <grant.likely@secretlab.ca>,
"linus.walleij@linaro.org" <linus.walleij@linaro.org>,
"khali@linux-fr.org" <khali@linux-fr.org>,
Bjorn Helgaas <bhelgaas@google.com>,
"Zheng, Lv" <lv.zheng@intel.com>
Subject: Re: [PATCH 3/3] ACPI: Evaluate _CRS while creating device node objects
Date: Tue, 13 Nov 2012 23:56:40 +0100 [thread overview]
Message-ID: <1957831.MvUm7YPtfp@vostro.rjw.lan> (raw)
In-Reply-To: <94F2FBAB4432B54E8AACC7DFDE6C92E346BC083A@ORSMSX101.amr.corp.intel.com>
On Tuesday, November 13, 2012 10:06:03 PM Moore, Robert wrote:
> I may not quite understand what you are asking for, but I will try.
> It seems like we already have much of what you want/need, so maybe
> I'm missing something.
I think all of the necessary pieces are there.
> > So what I would like to have, in general terms, is something like
> > acpi_walk_resources() split into three parts:
> >
> > (1) One that processes the _CRS output and creates a list of
> > struct acpi_resource objects for us to play with. I suppose
> > it's OK if that's just a buffer filled with resource objects,
> > but a linked list might be more convenient.
> >
>
> This sounds like AcpiGetCurrentResources. It executes _CRS and formats
> the data into acpi_resource objects.
Yes, it does. However, it is not completely clear to me if/how the caller is
supposed to prepare the buffer object pointed to by the second arg.
If the buffer is initialized by AcpiGetCurrentResources, then that's what
I need for (1).
> > (2) One that allows us to access (read/write) resources in the
> > list returned by (1). We don't need to open code walking
> > the list and I probably wouldn't event want to do that. What
> > we need is to be able to walk the same list for a number of
> > times and possibly to modify values in the resource objects
> > if there are conflicts.
>
> This sounds like AcpiWalkResources. I suppose a possible issue is that
> currently, AcpiWalkResources actually invokes the _CRS, _PRS, or _AEI
> method on behalf of the caller.
Yes, that exactly is the problem.
> It might make more sense to allow the caller to pass in the resource buffer
> returned from a call to _CRS, etc.
Yes! :-)
> >
> > (3) One allowing us to free the list returned by (1) if not needed
> > any more.
> >
>
> AcpiGetCurrentResources: Currently, everything is returned in a single buffer
> to minimize the number of allocations. A buffer you can free when you are
> done with it.
I suppose I should use ACPI_FREE(buffer.pointer) for that, but isn't it for the
ACPICA's internal use only?
Besides, I would prefer to be able to pass just "buffer" for freeing, without
having to touch its internals. No big deal, but it would be nicer. :-)
> I think I saw where you mentioned that you cannot copy this buffer because
> of internal pointers to other areas of the buffer. Yes. However, we can build
> linked lists all day if you really want them :-)
I really won't care if I can pass a resource buffer to a "walker" routine. :-)
> > And it would be great if we could take the list returned by (1), modify
> > the resources in it and feed it back to _SRS (after conversion back to the
> > format that _SRS understands).
> >
>
> AcpiSetCurrentResources.
>
> The AML debugger already has a command that illustrates the use of the
> various resource interfaces, see dbcmds.c
I will.
Thanks,
Rafael
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
next prev parent reply other threads:[~2012-11-13 22:52 UTC|newest]
Thread overview: 119+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-03 7:46 [PATCH 0/3] ACPI 5 support for GPIO, SPI and I2C Mika Westerberg
2012-11-03 7:46 ` [PATCH 1/3] gpio / ACPI: add ACPI support Mika Westerberg
2012-11-05 11:53 ` Linus Walleij
2012-11-05 12:14 ` Mathias Nyman
2012-11-05 12:46 ` Rafael J. Wysocki
2012-11-05 13:11 ` Linus Walleij
2012-11-05 13:19 ` Rafael J. Wysocki
2012-11-05 13:28 ` Linus Walleij
2012-11-05 13:50 ` Rafael J. Wysocki
2012-11-05 14:40 ` Linus Walleij
2012-11-06 9:39 ` Mika Westerberg
2012-11-06 10:15 ` Linus Walleij
2012-11-07 8:54 ` Mika Westerberg
2012-11-08 15:55 ` Grant Likely
2012-11-08 19:38 ` Mika Westerberg
2012-11-09 14:11 ` Mathias Nyman
2012-11-09 14:18 ` Grant Likely
2012-11-09 15:05 ` Mathias Nyman
2012-11-09 15:46 ` Grant Likely
2012-11-11 9:50 ` Mika Westerberg
2012-11-03 7:46 ` [PATCH 2/3] spi / ACPI: add ACPI enumeration support Mika Westerberg
2012-11-03 19:42 ` Bjorn Helgaas
2012-11-03 20:13 ` Mika Westerberg
2012-11-03 20:59 ` Rafael J. Wysocki
2012-11-05 10:31 ` Rafael J. Wysocki
2012-11-05 10:56 ` Mika Westerberg
2012-11-05 10:56 ` Mark Brown
2012-11-05 12:02 ` Mika Westerberg
2012-11-05 12:23 ` Jean Delvare
2012-11-05 12:59 ` Rafael J. Wysocki
2012-11-05 13:15 ` Mika Westerberg
2012-11-05 13:20 ` Linus Walleij
2012-11-05 13:43 ` Mika Westerberg
2012-11-05 14:03 ` Jean Delvare
2012-11-05 14:19 ` Rafael J. Wysocki
2012-11-05 14:53 ` Mika Westerberg
2012-11-05 15:19 ` Jean Delvare
2012-11-05 17:12 ` Mika Westerberg
2012-11-05 17:43 ` Bjorn Helgaas
2012-11-05 18:08 ` Mika Westerberg
2012-11-05 17:49 ` Jean Delvare
2012-11-05 20:42 ` Linus Walleij
2012-11-06 8:11 ` Mark Brown
2012-11-05 16:54 ` Bjorn Helgaas
2012-11-06 13:43 ` Rafael J. Wysocki
2012-11-06 20:35 ` Bjorn Helgaas
2012-11-06 22:28 ` Rafael J. Wysocki
2012-11-06 22:36 ` Rafael J. Wysocki
2012-11-07 9:58 ` Mika Westerberg
2012-11-07 11:14 ` Rafael J. Wysocki
2012-11-07 13:05 ` Mika Westerberg
2012-11-08 0:46 ` Rafael J. Wysocki
2012-11-08 20:20 ` Mika Westerberg
2012-11-08 20:54 ` Rafael J. Wysocki
2012-11-08 18:05 ` Grant Likely
2012-11-08 21:06 ` Rafael J. Wysocki
2012-11-08 21:34 ` Grant Likely
2012-11-05 10:54 ` Mark Brown
2012-11-03 20:39 ` Rafael J. Wysocki
2012-11-05 16:54 ` Bjorn Helgaas
2012-11-06 13:16 ` Rafael J. Wysocki
2012-11-06 20:53 ` Bjorn Helgaas
2012-11-06 22:18 ` Rafael J. Wysocki
2012-11-07 9:56 ` Mika Westerberg
2012-11-08 19:32 ` Bjorn Helgaas
2012-11-08 20:04 ` Mika Westerberg
2012-11-09 15:11 ` Bjorn Helgaas
2012-11-09 15:45 ` Grant Likely
2012-11-09 16:35 ` Bjorn Helgaas
2012-11-09 16:43 ` Grant Likely
2012-11-09 16:48 ` Mark Brown
2012-11-09 16:53 ` Bjorn Helgaas
2012-11-10 11:10 ` Rafael J. Wysocki
2012-11-10 11:16 ` Grant Likely
2012-11-10 17:14 ` Bjorn Helgaas
2012-11-10 19:40 ` Rafael J. Wysocki
2012-11-05 10:54 ` Mark Brown
2012-11-05 11:03 ` Mika Westerberg
2012-11-05 11:13 ` Mark Brown
2012-11-08 18:48 ` Grant Likely
2012-11-09 3:50 ` Mika Westerberg
2012-11-03 7:46 ` [PATCH 3/3] i2c " Mika Westerberg
2012-11-03 21:52 ` Jean Delvare
2012-11-04 7:23 ` Mika Westerberg
2012-11-04 8:50 ` Jean Delvare
2012-11-04 10:50 ` Mika Westerberg
2012-11-08 18:58 ` Grant Likely
2012-11-09 3:51 ` Mika Westerberg
2012-11-04 18:29 ` [PATCH 0/3] ACPI 5 support for GPIO, SPI and I2C Linus Walleij
2012-11-05 9:23 ` Mika Westerberg
2012-11-12 11:51 ` [PATCH 0/3] Centralized parsing of ACPI device resources (was: Re: [PATCH 0/3] ACPI 5 support for GPIO, SPI and I2C) Rafael J. Wysocki
2012-11-12 12:00 ` [PATCH 1/3] ACPI: Move device resources interpretation code from PNP to ACPI core Rafael J. Wysocki
2012-11-12 13:27 ` Mika Westerberg
2012-11-12 20:25 ` [Update][PATCH " Rafael J. Wysocki
2012-11-12 12:01 ` [PATCH 2/3] ACPI / platform: Use common ACPI device resource parsing routines Rafael J. Wysocki
2012-11-12 12:02 ` [PATCH 3/3] ACPI: Evaluate _CRS while creating device node objects Rafael J. Wysocki
2012-11-12 14:46 ` Mika Westerberg
2012-11-12 21:03 ` Rafael J. Wysocki
2012-11-13 7:12 ` Mika Westerberg
2012-11-13 12:06 ` [Replacement][PATCH 3/3] Rafael J. Wysocki
2012-11-13 14:16 ` Mika Westerberg
2012-11-13 15:15 ` Rafael J. Wysocki
2012-11-13 15:18 ` Mika Westerberg
2012-11-13 15:28 ` Rafael J. Wysocki
2012-11-13 15:37 ` Mika Westerberg
2012-11-13 16:34 ` [PATCH 3/3] ACPI: Evaluate _CRS while creating device node objects Moore, Robert
2012-11-13 20:44 ` Rafael J. Wysocki
2012-11-13 22:06 ` Moore, Robert
2012-11-13 22:56 ` Rafael J. Wysocki [this message]
2012-11-14 2:23 ` Moore, Robert
2012-11-14 9:18 ` Rafael J. Wysocki
2012-11-14 9:32 ` Rafael J. Wysocki
2012-11-14 14:20 ` Moore, Robert
2012-11-13 20:51 ` [PATCH 0/3 rev 2] Centralized parsing of ACPI device resources Rafael J. Wysocki
2012-11-13 20:55 ` [PATCH 1/3 rev 2] ACPI: Move device resources interpretation code from PNP to ACPI core Rafael J. Wysocki
2012-11-13 20:55 ` [PATCH 2/3 rev 2] ACPI / platform: Use common ACPI device resource parsing routines Rafael J. Wysocki
2012-11-13 20:56 ` [PATCH 3/3 rev 2] ACPI: Centralized processing of ACPI device resources Rafael J. Wysocki
2012-11-14 9:52 ` [PATCH 0/3 rev 2] Centralized parsing " Mika Westerberg
2012-11-14 10:08 ` Rafael J. Wysocki
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