07 Nov, 2015
2 commits
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* acpi-pci:
PCI: ACPI: Add support for PCI device DMA coherency
PCI: OF: Move of_pci_dma_configure() to pci_dma_configure()
of/pci: Fix pci_get_host_bridge_device leak
device property: ACPI: Remove unused DMA APIs
device property: ACPI: Make use of the new DMA Attribute APIs
device property: Adding DMA Attribute APIs for Generic Devices
ACPI: Adding DMA Attribute APIs for ACPI Device
device property: Introducing enum dev_dma_attr
ACPI: Honor ACPI _CCA attribute settingConflicts:
drivers/crypto/ccp/ccp-platform.c -
Now that we have the new DMA attribute APIs, we can replace the older
acpi_check_dma() and device_dma_is_coherent().Signed-off-by: Suravee Suthikulpanit
Acked-by: Bjorn Helgaas
Reviewed-by: Hanjun Guo
Signed-off-by: Rafael J. Wysocki
15 Sep, 2015
1 commit
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This patch changes the type of the return value of the init_acpi_device_notify()
method to be void, as this method never fails and its return value is never
used.Signed-off-by: Rami Rosen
Signed-off-by: Rafael J. Wysocki
15 Jun, 2015
1 commit
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This patch implements support for ACPI _CCA object, which is introduced in
ACPIv5.1, can be used for specifying device DMA coherency attribute.The parsing logic traverses device namespace to parse coherency
information, and stores it in acpi_device_flags. Then uses it to call
arch_setup_dma_ops() when creating each device enumerated in DSDT
during ACPI scan.This patch also introduces acpi_dma_is_coherent(), which provides
an interface for device drivers to check the coherency information
similarly to the of_dma_is_coherent().Signed-off-by: Mark Salter
Signed-off-by: Suravee Suthikulpanit
Signed-off-by: Rafael J. Wysocki
17 Mar, 2015
1 commit
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Now that the ACPI companions of devices are represented by pointers
to struct fwnode_handle, it is not quite efficient to check whether
or not an ACPI companion of a device is present by evaluating the
ACPI_COMPANION() macro.For this reason, introduce a special static inline routine for that,
has_acpi_companion(), and update the code to use it where applicable.Signed-off-by: Rafael J. Wysocki
11 Feb, 2014
1 commit
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In some cases it may be necessary to perform certain setup/cleanup
operations on a device object representing a physical device after
it has been associated with an ACPI companion by acpi_bind_one() or
before disassociating it from that companion by acpi_unbind_one(),
respectively. If there is a struct acpi_bus_type object for the
given device's bus type, the .setup()/.cleanup() callbacks from there
are executed for these purposes. However, an analogous mechanism will
be necessary for devices whose bus types don't have corresponding
struct acpi_bus_type objects and that have specific ACPI scan handlers.For those devices, add new .bind() and .unbind() callbacks to struct
acpi_scan_handler that will be executed by acpi_platform_notify()
right after the given device has been associated with an ACPI
comapnion and by acpi_platform_notify_remove() right before calling
acpi_unbind_one() for that device, respectively.To make that work for scan handlers registering new devices in their
.attach() callbacks, modify acpi_scan_attach_handler() to set the
ACPI device object's handler field before calling .attach() from the
scan handler at hand.This changeset includes a fix from Mika Westerberg.
Signed-off-by: Rafael J. Wysocki
07 Dec, 2013
7 commits
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Since drivers/ide/ide-acpi.c is the only remaining user of
acpi_get_child(), move that function into that file as a static
routine.Signed-off-by: Rafael J. Wysocki
-
There is no reason to pass an ACPI handle to acpi_bind_one() instead
of a struct acpi_device pointer to the target device object, so
modify that function to take a struct acpi_device pointer as its
second argument and update all code depending on it accordingly.Signed-off-by: Rafael J. Wysocki
Tested-by: Lan Tianyu # for USB/ACPI -
Replace the .find_device function pointer in struct acpi_bus_type
with a new one, .find_companion, that is supposed to point to a
function returning struct acpi_device pointer (instead of an int)
and takes one argument (instead of two). This way the role of
this callback is more clear and the implementation of it can
be more straightforward.Update all of the users of struct acpi_bus_type (PCI, PNP/ACPI and
USB) to reflect the structure change.Signed-off-by: Rafael J. Wysocki
Tested-by: Lan Tianyu # for USB/ACPI -
Modify acpi_preset_companion() to take a struct acpi_device pointer
instead of an ACPI handle as its second argument and redefine it as
a static inline wrapper around ACPI_COMPANION_SET() passing the
return value of acpi_find_child_device() directly as the second
argument to it. Update its users to pass struct acpi_device
pointers instead of ACPI handles to it.This allows some unnecessary acpi_bus_get_device() calls to be
avoided.Signed-off-by: Rafael J. Wysocki
Reviewed-by: Aaron Lu
Tested-by: Aaron Lu # for ATA binding -
Since acpi_get_child() is the only user of acpi_find_child() now,
drop the static inline definition of the former and redefine the
latter as new acpi_get_child().Signed-off-by: Rafael J. Wysocki
Reviewed-by: Aaron Lu
Tested-by: Aaron Lu # for ATA binding -
It is much more efficient to use acpi_find_child_device()
for child devices lookup in acpi_pci_find_device() and pass
ACPI_COMPANION(dev->parent) to it directly instead of obtaining
ACPI_HANDLE() of ACPI_COMPANION(dev->parent) and passing it to
acpi_find_child() which has to run acpi_bus_get_device() to
obtain ACPI_COMPANION(dev->parent) from that again.Signed-off-by: Rafael J. Wysocki
Reviewed-by: Aaron Lu -
Now that we create a struct acpi_device object for every ACPI
namespace node representing a device, it is not necessary to
use acpi_walk_namespace() for child device lookup in
acpi_find_child() any more. Instead, we can simply walk the
list of children of the given struct acpi_device object and
return the matching one (or the one which is the best match if
there are more of them). The checks done during the matching
loop can be simplified too so that the secondary namespace walks
in find_child_checks() are not necessary any more.Signed-off-by: Rafael J. Wysocki
Reviewed-by: Aaron Lu
15 Nov, 2013
2 commits
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When associating a "physical" device with an ACPI device object
acpi_bind_one() only uses get_device() to increment the reference
counter of the former, but there is no reason not to do that with
the latter too. Among other things, that may help to avoid
use-after-free when an ACPI device object is freed without calling
acpi_unbind_one() for all "physical" devices associated with it
(that only can happen in buggy code, but then it's better if the
kernel doesn't crash as a result of a bug).For this reason, modify acpi_bind_one() to apply get_device() to
the ACPI device object too and update acpi_unbind_one() to drop
that reference using put_device() as appropriate.Signed-off-by: Rafael J. Wysocki
Acked-by: Greg Kroah-Hartman
Reviewed-by: Lan Tianyu -
Modify struct acpi_dev_node to contain a pointer to struct acpi_device
associated with the given device object (that is, its ACPI companion
device) instead of an ACPI handle corresponding to it. Introduce two
new macros for manipulating that pointer in a CONFIG_ACPI-safe way,
ACPI_COMPANION() and ACPI_COMPANION_SET(), and rework the
ACPI_HANDLE() macro to take the above changes into account.
Drop the ACPI_HANDLE_SET() macro entirely and rework its users to
use ACPI_COMPANION_SET() instead. For some of them who used to
pass the result of acpi_get_child() directly to ACPI_HANDLE_SET()
introduce a helper routine acpi_preset_companion() doing an
equivalent thing.The main motivation for doing this is that there are things
represented by struct acpi_device objects that don't have valid
ACPI handles (so called fixed ACPI hardware features, such as
power and sleep buttons) and we would like to create platform
device objects for them and "glue" them to their ACPI companions
in the usual way (which currently is impossible due to the
lack of valid ACPI handles). However, there are more reasons
why it may be useful.First, struct acpi_device pointers allow of much better type checking
than void pointers which are ACPI handles, so it should be more
difficult to write buggy code using modified struct acpi_dev_node
and the new macros. Second, the change should help to reduce (over
time) the number of places in which the result of ACPI_HANDLE() is
passed to acpi_bus_get_device() in order to obtain a pointer to the
struct acpi_device associated with the given "physical" device,
because now that pointer is returned by ACPI_COMPANION() directly.
Finally, the change should make it easier to write generic code that
will build both for CONFIG_ACPI set and unset without adding explicit
compiler directives to it.Signed-off-by: Rafael J. Wysocki
Acked-by: Greg Kroah-Hartman
Tested-by: Mika Westerberg # on Haswell
Reviewed-by: Mika Westerberg
Reviewed-by: Aaron Lu # for ATA and SDIO part
10 Sep, 2013
1 commit
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As reported at https://bugzilla.kernel.org/show_bug.cgi?id=60829,
there still are cases in which do_find_child() doesn't choose the
ACPI device object it is "expected" to choose if there are more such
objects matching one PCI device present. This particular problem may
be worked around by making do_find_child() return device obejcts witn
_STA whose result indicates that the device is enabled before device
objects without _STA if there's more than one device object to choose
from.This change doesn't affect the case in which there's only one
matching ACPI device object per PCI device.References: https://bugzilla.kernel.org/show_bug.cgi?id=60829
Reported-by: Peter Wu
Tested-by: Felix Lisczyk
Signed-off-by: Rafael J. Wysocki
09 Aug, 2013
2 commits
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Although the device links created by acpi_bind_one() are not
essential from the kernel functionality point of view, user space
may be confused when they are missing, so print diagnostic messages
to the kernel log if they can't be created.Signed-off-by: Rafael J. Wysocki
Acked-by: Toshi Kani -
The out_free label in acpi_bind_one() is only jumped to from one
place, so in fact it is not necessary, because the code below it
can be moved to that place directly. Move that code and drop the
label.Signed-off-by: Rafael J. Wysocki
Acked-by: Toshi Kani
08 Aug, 2013
7 commits
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The error code path in acpi_unbind_one() is unnecessarily complicated
(in particular, the err label is not really necessary) and the error
message printed by it is inaccurate (there's nothing called
'acpi_handle' in that function), so clean up those things.Signed-off-by: Rafael J. Wysocki
Acked-by: Toshi Kani
Acked-by: Yasuaki Ishimatsu -
Since acpi_unbind_one() walks physical_node_list under the ACPI
device object's physical_node_lock mutex and the walk may be
terminated as soon as the matching entry has been found, it is
not necessary to use list_for_each_safe() for that walk, so use
list_for_each_entry() instead and make the code slightly more
straightforward.Signed-off-by: Rafael J. Wysocki
Acked-by: Toshi Kani
Acked-by: Yasuaki Ishimatsu -
Clean up some inconsistent use of whitespace in acpi_bind_one() and
acpi_unbind_one().Signed-off-by: Rafael J. Wysocki
Acked-by: Toshi Kani
Acked-by: Yasuaki Ishimatsu -
Put the creation of symlinks in acpi_bind_one() under the
physical_node_lock mutex of the given ACPI device object, because
that is part of the binding operation logically (those links are
already removed under that mutex too).Signed-off-by: Rafael J. Wysocki
Acked-by: Toshi Kani
Acked-by: Yasuaki Ishimatsu -
Move some duplicated code from acpi_bind_one() and acpi_unbind_one()
into a separate function and make that function use snprintf()
instead of sprintf() for extra safety.Signed-off-by: Rafael J. Wysocki
Acked-by: Toshi Kani
Acked-by: Yasuaki Ishimatsu -
Modify acpi_bind_one() so that it doesn't fail if the device
represented by its first argument has already been bound to the
given ACPI handle (second argument), because that is not a good
enough reason for returning an error code.Signed-off-by: Rafael J. Wysocki
Reviewed-by: Lan Tianyu
Acked-by: Toshi Kani -
In theory, under a given ACPI namespace node there should be only
one child device object with _ADR whose value matches a given bus
address exactly. In practice, however, there are systems in which
multiple child device objects under a given parent have _ADR matching
exactly the same address. In those cases we use _STA to determine
which of the multiple matching devices is enabled, since some systems
are known to indicate which ACPI device object to associate with the
given physical (usually PCI) device this way.Unfortunately, as it turns out, there are systems in which many
device objects under the same parent have _ADR matching exactly the
same bus address and none of them has _STA, in which case they all
should be regarded as enabled according to the spec. Still, if
those device objects are supposed to represent bridges (e.g. this
is the case for device objects corresponding to PCIe ports), we can
try harder and skip the ones that have no child device objects in the
ACPI namespace. With luck, we can avoid using device objects that we
are not expected to use this way.Although this only works for bridges whose children also have ACPI
namespace representation, it is sufficient to address graphics
adapter detection issues on some systems, so rework the code finding
a matching device ACPI handle for a given bus address to implement
this idea.Introduce a new function, acpi_find_child(), taking three arguments:
the ACPI handle of the device's parent, a bus address suitable for
the device's bus type and a bool indicating if the device is a
bridge and make it work as outlined above. Reimplement the function
currently used for this purpose, acpi_get_child(), as a call to
acpi_find_child() with the last argument set to 'false' and make
the PCI subsystem use acpi_find_child() with the bridge information
passed as the last argument to it. [Lan Tianyu notices that it is
not sufficient to use pci_is_bridge() for that, because the device's
subordinate pointer hasn't been set yet at this point, so use
hdr_type instead.]This change fixes a regression introduced inadvertently by commit
33f767d (ACPI: Rework acpi_get_child() to be more efficient) which
overlooked the fact that for acpi_walk_namespace() "post-order" means
"after all children have been visited" rather than "on the way back",
so for device objects without children and for namespace walks of
depth 1, as in the acpi_get_child() case, the "post-order" callbacks
ordering is actually the same as the ordering of "pre-order" ones.
Since that commit changed the namespace walk in acpi_get_child() to
terminate after finding the first matching object instead of going
through all of them and returning the last one, it effectively
changed the result returned by that function in some rare cases and
that led to problems (the switch from a "pre-order" to a "post-order"
callback was supposed to prevent that from happening, but it was
ineffective).As it turns out, the systems where the change made by commit
33f767d actually matters are those where there are multiple ACPI
device objects representing the same PCIe port (which effectively
is a bridge). Moreover, only one of them, and the one we are
expected to use, has child device objects in the ACPI namespace,
so the regression can be addressed as described above.References: https://bugzilla.kernel.org/show_bug.cgi?id=60561
Reported-by: Peter Wu
Tested-by: Vladimir Lalov
Signed-off-by: Rafael J. Wysocki
Acked-by: Bjorn Helgaas
Cc: 3.9+ # 3.9+
06 Aug, 2013
1 commit
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The physical_node_id_bitmap in struct acpi_device is only used for
looking up the first currently unused dependent phyiscal node ID
by acpi_bind_one(). It is not really necessary, however, because
acpi_bind_one() walks the entire physical_node_list of the given
device object for sanity checking anyway and if that list is always
sorted by node_id, it is straightforward to find the first gap
between the currently used node IDs and use that number as the ID
of the new list node.This also removes the artificial limit of the maximum number of
dependent physical devices per ACPI device object, which now depends
only on the capacity of unsigend int. As a result, it fixes a
regression introduced by commit e2ff394 (ACPI / memhotplug: Bind
removable memory blocks to ACPI device nodes) that caused
acpi_memory_enable_device() to fail when the number of 128 MB blocks
within one removable memory module was greater than 32.Reported-and-tested-by: Yasuaki Ishimatsu
Signed-off-by: Rafael J. Wysocki
Acked-by: Toshi Kani
Reviewed-by: Yasuaki Ishimatsu
28 Jun, 2013
1 commit
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* acpi-assorted:
ACPI / EC: Add HP Folio 13 to ec_dmi_table in order to skip DSDT scan
ACPI: Add CMOS RTC Operation Region handler support
ACPI: Remove unused flags in acpi_device_flags
ACPI: Remove useless initializers
ACPI / battery: Make sure all spaces are in correct places
ACPI: add _STA evaluation at do_acpi_find_child()
ACPI / EC: access user space with get_user()/put_user()
20 Jun, 2013
1 commit
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Once do_acpi_find_child() has found the first matching handle, it
makes the acpi_get_child() loop stop and return that handle. On some
platforms, though, there are multiple devices with the same value of
"_ADR" in the same namespace scope, and if one of them is enabled,
the others will be disabled. For example:Address : 0x1FFFF ; path : SB_PCI0.SATA.DEV0
Address : 0x1FFFF ; path : SB_PCI0.SATA.DEV1
Address : 0x1FFFF ; path : SB_PCI0.SATA.DEV2If DEV0 and DEV1 are disabled and DEV2 is enabled, the handle of DEV2
should be returned, but actually the function always returns the
handle of DEV0.To address that issue, make do_acpi_find_child() evaluate _STA to
check the device status. If a matching device object exists, but is
disabled, acpi_get_child() will continue to walk the namespace in the
hope of finding an enabled one. If one is found, its handle will be
returned, but otherwise the function will return the handle of the
disabled object found before (in case it is enabled going forward).[rjw: Changelog]
Signed-off-by: Jeff Wu
Signed-off-by: Rafael J. Wysocki
12 May, 2013
1 commit
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Split the ACPI processor driver into two parts, one that is
non-modular, resides in the ACPI core and handles the enumeration
and hotplug of processors and one that implements the rest of the
existing processor driver functionality.The non-modular part uses an ACPI scan handler object to enumerate
processors on the basis of information provided by the ACPI namespace
and to hook up with the common ACPI hotplug infrastructure. It also
populates the ACPI handle of each processor device having a
corresponding object in the ACPI namespace, which allows the driver
proper to bind to those devices, and makes the driver bind to them
if it is readily available (i.e. loaded) when the scan handler's
.attach() routine is running.There are a few reasons to make this change.
First, switching the ACPI processor driver to using the common ACPI
hotplug infrastructure reduces code duplication and size considerably,
even though a new file is created along with a header comment etc.Second, since the common hotplug code attempts to offline devices
before starting the (non-reversible) removal procedure, it will abort
(and possibly roll back) hot-remove operations involving processors
if cpu_down() returns an error code for one of them instead of
continuing them blindly (if /sys/firmware/acpi/hotplug/force_remove
is unset). That is a more desirable behavior than what the current
code does.Finally, the separation of the scan/hotplug part from the driver
proper makes it possible to simplify the driver's .remove() routine,
because it doesn't need to worry about the possible cleanup related
to processor removal any more (the scan/hotplug part is responsible
for that now) and can handle device removal and driver removal
symmetricaly (i.e. as appropriate).Some user-visible changes in sysfs are made (for example, the
'sysdev' link from the ACPI device node to the processor device's
directory is gone and a 'physical_node' link is present instead
and a corresponding 'firmware_node' is present in the processor
device's directory, the processor driver is now visible under
/sys/bus/cpu/drivers/ and bound to the processor device), but
that shouldn't affect the functionality that users care about
(frequency scaling, C-states and thermal management).Tested on my venerable Toshiba Portege R500.
Signed-off-by: Rafael J. Wysocki
Acked-by: Greg Kroah-Hartman
Reviewed-by: Toshi Kani
04 Mar, 2013
2 commits
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After PCI and USB have stopped using the .find_bridge() callback in
struct acpi_bus_type, the only remaining user of it is SATA, but SATA
only pretends to be a user, because it points that callback to a stub
always returning -ENODEV.For this reason, drop the SATA's dummy .find_bridge() callback and
remove .find_bridge(), which is not used any more, from struct
acpi_bus_type entirely.Signed-off-by: Rafael J. Wysocki
Acked-by: Yinghai Lu
Acked-by: Jeff Garzik -
USB uses the .find_bridge() callback from struct acpi_bus_type
incorrectly, because as a result of the way it is used by USB every
device in the system that doesn't have a bus type or parent is
passed to usb_acpi_find_device() for inspection.What USB actually needs, though, is to call usb_acpi_find_device()
for USB ports that don't have a bus type defined, but have
usb_port_device_type as their device type, as well as for USB
devices.To fix that replace the struct bus_type pointer in struct
acpi_bus_type used for matching devices to specific subsystems
with a .match() callback to be used for this purpose and update
the users of struct acpi_bus_type, including USB, accordingly.
Define the .match() callback routine for USB, usb_acpi_bus_match(),
in such a way that it will cover both USB devices and USB ports
and remove the now redundant .find_bridge() callback pointer from
usb_acpi_bus.Signed-off-by: Rafael J. Wysocki
Acked-by: Greg Kroah-Hartman
Acked-by: Yinghai Lu
Acked-by: Jeff Garzik
15 Feb, 2013
1 commit
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* acpi-assorted:
ACPI: Add DMI entry for Sony VGN-FW41E_H
ACPI: fix obsolete comment in custom_method.c
ACPI / thermal: Use mode to enable/disable kernel thermal processing
ACPI thermal: remove unnecessary newline from exception message
ACPI sysfs: remove unnecessary newline from exception
ACPI video: remove unnecessary newline from error messages
ACPI: SRAT: report non-volatile memory in debug
ACPI: Rework acpi_get_child() to be more efficient
11 Feb, 2013
1 commit
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* acpi-scan: (30 commits)
ACPI / scan: Fix acpi_bus_get_device() check in acpi_match_device()
ACPI / scan: Make namespace scanning and trimming mutually exclusive
ACPI / scan: Make it clear that acpi_bus_trim() cannot fail
ACPI / scan: Drop acpi_bus_add() and use acpi_bus_scan() instead
ACPI: update ej_event interface to take acpi_device
ACPI / scan: Add second pass to acpi_bus_trim()
ACPI / scan: Change the implementation of acpi_bus_trim()
ACPI / scan: Drop the second argument of acpi_bus_trim()
ACPI / scan: Drop the second argument of acpi_device_unregister()
ACPI: Remove the ops field from struct acpi_device
ACPI: remove unused acpi_op_bind and acpi_op_unbind
ACPI / scan: Fix check of device_attach() return value.
ACPI / scan: Treat power resources in a special way
ACPI: Remove unused struct acpi_pci_root.id member
ACPI: Drop ACPI device .bind() and .unbind() callbacks
ACPI / PCI: Move the _PRT setup and cleanup code to pci-acpi.c
ACPI / PCI: Rework the setup and cleanup of device wakeup
ACPI: Add .setup() and .cleanup() callbacks to struct acpi_bus_type
ACPI: Make acpi_bus_scan() and acpi_bus_add() take only one argument
ACPI: Replace ACPI device add_type field with a match_driver flag
...
26 Jan, 2013
1 commit
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Observe that acpi_get_child() doesn't need to use the helper
struct acpi_find_child structure and change it to work without it.
Also, using acpi_get_object_info() to get the output of _ADR for the
given device is overkill, because that function does much more than
just evaluating _ADR (let alone the additional memory allocation
done by it).Moreover, acpi_get_child() doesn't need to loop any more once it has
found a matching handle, so make it stop in that case. To prevent
the results from changing, make it use do_acpi_find_child() as
a post-order callback.Signed-off-by: Rafael J. Wysocki
12 Jan, 2013
1 commit
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If ACPI_GLUE_DEBUG is different from 0 (setting this requires a
manual change of glue.c), build breaks because of a leftover
reference to dev->acpi_handle in acpi_platform_notify(). Fix this
by using ACPI_HANDLE(dev) instead as appropriate.[rjw: Subject and changelog]
Signed-off-by: Yinghai Lu
Signed-off-by: Rafael J. Wysocki
03 Jan, 2013
2 commits
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Currently these DBG statements are emitted at KERN_DEFAULT.
Change the macro to emit at KERN_DEBUG.This can help avoid unexpected message interleaving.
Signed-off-by: Joe Perches
Signed-off-by: Rafael J. Wysocki -
Add two new callbacks,.setup() and .cleanup(), struct acpi_bus_type
and modify acpi_platform_notify() to call .setup() after executing
acpi_bind_one() successfully and acpi_platform_notify_remove() to
call .cleanup() before running acpi_unbind_one(). This will allow
the users of struct acpi_bus_type, PCI in particular, to specify
operations to be executed right after the given device has been
associated with a companion struct acpi_device and right before
it's going to be detached from that companion, respectively.The main motivation is to be able to get rid of acpi_pci_bind()
and acpi_pci_unbind(), which are horrible horrible stuff. [In short,
there are three problems with them: The way they populate the .bind()
and .unbind() callbacks of ACPI devices is rather less than
straightforward, they require special hotplug-specific paths to be
present in the ACPI namespace scanning code and by the time
acpi_pci_unbind() is called the PCI device object in question may
not exist any more.]Signed-off-by: Rafael J. Wysocki
Acked-by: Yinghai Lu
Acked-by: Toshi Kani
21 Nov, 2012
2 commits
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To avoid adding an ACPI handle pointer to struct device on
architectures that don't use ACPI, or generally when CONFIG_ACPI is
not set, in which cases that pointer is useless, define struct
acpi_dev_node that will contain the handle pointer if CONFIG_ACPI is
set and will be empty otherwise and use it to represent the ACPI
device node field in struct device.In addition to that define macros for reading and setting the ACPI
handle of a device that don't generate code when CONFIG_ACPI is
unset. Modify the ACPI subsystem to use those macros instead of
referring to the given device's ACPI handle directly.Signed-off-by: Rafael J. Wysocki
Reviewed-by: Mika Westerberg
Acked-by: Greg Kroah-Hartman -
Currently, the ACPI handles of devices are initialized from within
device_add(), by acpi_bind_one() called from acpi_platform_notify()
which first uses the .find_device() routine provided by the device's
bus type to find the matching device node in the ACPI namespace.
This is a source of some computational overhead and, moreover, the
correctness of the result depends on the implementation of
.find_device() which is known to fail occasionally for some bus types
(e.g. PCI). In some cases, however, the corresponding ACPI device
node is known already before calling device_add() for the given
struct device object and the whole .find_device() dance in
acpi_platform_notify() is then simply unnecessary.For this reason, make it possible to initialize the ACPI handles of
devices before calling device_add() for them. Modify
acpi_platform_notify() to call acpi_bind_one() in advance to check
the device's existing ACPI handle and skip the .find_device()
search if that is successful. Change acpi_bind_one() accordingly.Signed-off-by: Rafael J. Wysocki
Reviewed-by: Mika Westerberg
15 Nov, 2012
1 commit
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With ACPI 5 we are starting to see devices that don't natively support
discovery but can be enumerated with the help of the ACPI namespace.
Typically, these devices can be represented in the Linux device driver
model as platform devices or some serial bus devices, like SPI or I2C
devices.Since we want to re-use existing drivers for those devices, we need a
way for drivers to specify the ACPI IDs of supported devices, so that
they can be matched against device nodes in the ACPI namespace. To
this end, it is sufficient to add a pointer to an array of supported
ACPI device IDs, that can be provided by the driver, to struct device.Moreover, things like ACPI power management need to have access to
the ACPI handle of each supported device, because that handle is used
to invoke AML methods associated with the corresponding ACPI device
node. The ACPI handles of devices are now stored in the archdata
member structure of struct device whose definition depends on the
architecture and includes the ACPI handle only on x86 and ia64. Since
the pointer to an array of supported ACPI IDs is added to struct
device_driver in an architecture-independent way, it is logical to
move the ACPI handle from archdata to struct device itself at the same
time. This also makes code more straightforward in some places and
follows the example of Device Trees that have a poiter to struct
device_node in there too.This changeset is based on Mika Westerberg's work.
Signed-off-by: Mika Westerberg
Acked-by: Greg Kroah-Hartman
Acked-by: H. Peter Anvin
Acked-by: Tony Luck
Signed-off-by: Rafael J. Wysocki
