x86 / ACPI / sleep: Provide registration for acpi_suspend_lowlevel.

Which by default will be x86_acpi_suspend_lowlevel.
This registration allows us to register another callback
if there is a need to use another platform specific callback.

Signed-off-by: Liang Tang <liang.tang@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Ben Guthro <benjamin.guthro@citrix.com>
Acked-by: "H. Peter Anvin" <hpa@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
xen / ACPI / sleep: Register an acpi_suspend_lowlevel callback.

We piggyback on "x86/acpi: Provide registration for acpi_suspend_lowlevel."
to register a Xen version of the callback. The callback does not
do anything special - except it omits the x86_acpi_suspend_lowlevel.

This is necessary b/c during suspend the generic code tries to write
cr3 values that clashes with what the hypervisor has set up for the guest.

Signed-off-by: Liang Tang <liang.tang@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Ben Guthro <benjamin.guthro@citrix.com>
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
ACPI / APEI: Update EINJ documentation for param1/param2

To ensure EINJ working well when injecting errors via EINJ
table, add some attentions for param1/param2.

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
ACPI: implement acpi_os_get_timer() in accordance with the spec

ACPI Timer() opcode should return monotonically increasing clock with 100ns
granularity according the ACPI 5.0 spec.

Testing the current Timer() implementation with following ASL code (and an
additional debug print in acpi_os_sleep() to get the sleep times dumped out
to dmesg):

	// Test: 10ms
	Store(Timer, Local1)
	Sleep(10)
	Divide(Subtract(Timer, Local1), 10000,, Local1)
	Sleep(Local1)

	// Test: 200ms
	Store(Timer, Local1)
	Sleep(200)
	Divide(Subtract(Timer, Local1), 10000,, Local1)
	Sleep(Local1)

	// Test 1300ms
	Store(Timer, Local1)
	Sleep(1300)
	Divide(Subtract(Timer, Local1), 10000,, Local1)
	Sleep(Local1)

The second sleep value is calculated using Timer(). If the implementation
is good enough we should be able to get the second value pretty close to
the first.

However, the current Timer() gives pretty bad sleep times:

	[   11.488100] ACPI: acpi_os_get_timer() TBD
	[   11.492150] ACPI: Sleep(10)
	[   11.502993] ACPI: Sleep(0)
	[   11.506315] ACPI: Sleep(200)
	[   11.706237] ACPI: Sleep(0)
	[   11.709550] ACPI: Sleep(1300)
	[   13.008929] ACPI: Sleep(0)

Fix this with the help of ktime_get(). Once the fix is applied and run
against the same ASL code we get:

	[   11.486786] ACPI: Sleep(10)
	[   11.499029] ACPI: Sleep(12)
	[   11.512350] ACPI: Sleep(200)
	[   11.712282] ACPI: Sleep(200)
	[   11.912170] ACPI: Sleep(1300)
	[   13.211577] ACPI: Sleep(1300)

That is much more closer to the values we expected.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Merge branch 'acpi-assorted-next' into bleeding-edge

* acpi-assorted-next:
  ACPI: implement acpi_os_get_timer() in accordance with the spec
  ACPI / APEI: Update EINJ documentation for param1/param2
  xen / ACPI / sleep: Register an acpi_suspend_lowlevel callback.
  x86 / ACPI / sleep: Provide registration for acpi_suspend_lowlevel.
  ACPI / resources: call acpi_get_override_irq() only for legacy IRQ resources
  acpi: ec_sys: access user space with get_user()/put_user()
Driver core / memory: Simplify __memory_block_change_state()

As noted by Tang Chen, the last_online field in struct memory_block
introduced by commit 4960e05 (Driver core: Introduce offline/online
callbacks for memory blocks) is not really necessary, because
online_pages() restores the previous state if passed ONLINE_KEEP as
the last argument.  Therefore, remove that field along with the code
referring to it.

References: http://marc.info/?l=linux-kernel&m=136919777305599&w=2
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Tang Chen <tangchen@cn.fujitsu.com>
ACPI: Drop removal_type field from struct acpi_device

The ACPI processor driver was the only user of the removal_type
field in struct acpi_device, but it doesn't use that field any more
after recent changes.  Thus, removal_type has no more users, so drop
it along with the associated data type.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
ACPI / processor: Pass processor object handle to acpi_bind_one()

Make acpi_processor_add() pass the ACPI handle of the processor
namespace object to acpi_bind_one() instead of setting it directly
to allow acpi_bind_one() to catch possible bugs causing the ACPI
handle of the processor device to be set earlier.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
Driver core / MM: Drop offline_memory_block()

Since offline_memory_block(mem) is functionally equivalent to
device_offline(&mem->dev), make the only caller of the former use
the latter instead and drop offline_memory_block() entirely.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Toshi Kani <toshi.kani@hp.com>
ACPI / scan: Add second pass of companion offlining to hot-remove code

As indicated by comments in mm/memory_hotplug.c:remove_memory(),
if CONFIG_MEMCG is set, it may not be possible to offline all of the
memory blocks held by one module (FRU) in one pass (because one of
them may be used by the others to store page cgroup in that case
and that block has to be offlined before the other ones).

To handle that arguably corner case, add a second pass of companion
device offlining to acpi_scan_hot_remove() and make it ignore errors
returned in the first pass (and make it skip the second pass if the
first one is successful).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Toshi Kani <toshi.kani@hp.com>
Merge branch 'acpi-hotplug-next' into bleeding-edge

* acpi-hotplug-next:
  ACPI / scan: Add second pass of companion offlining to hot-remove code
  Driver core / MM: Drop offline_memory_block()
  ACPI / processor: Pass processor object handle to acpi_bind_one()
  ACPI: Drop removal_type field from struct acpi_device
  Driver core / memory: Simplify __memory_block_change_state()