mirror of
https://github.com/torvalds/linux
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be6b25d15f
Use the acpi_os_prepare_extended_sleep() callback to notify xen
to make use of the reduced hardware sleep functionality
The xen hypervisor change underlying this is commit 62d1a69
("ACPI: support v5 (reduced HW) sleep interface") on the master
branch of git://xenbits.xen.org/xen.git.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Ben Guthro <benjamin.guthro@citrix.com>
Acked-by: Konrad Wilk <konrad.wilk@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
77 lines
2.7 KiB
C
77 lines
2.7 KiB
C
/******************************************************************************
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* acpi.c
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* acpi file for domain 0 kernel
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*
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* Copyright (c) 2011 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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* Copyright (c) 2011 Yu Ke ke.yu@intel.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <xen/acpi.h>
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#include <xen/interface/platform.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/hypervisor.h>
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static int xen_acpi_notify_hypervisor_state(u8 sleep_state,
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u32 val_a, u32 val_b,
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bool extended)
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{
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unsigned int bits = extended ? 8 : 16;
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struct xen_platform_op op = {
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.cmd = XENPF_enter_acpi_sleep,
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.interface_version = XENPF_INTERFACE_VERSION,
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.u.enter_acpi_sleep = {
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.val_a = (u16)val_a,
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.val_b = (u16)val_b,
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.sleep_state = sleep_state,
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.flags = extended ? XENPF_ACPI_SLEEP_EXTENDED : 0,
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},
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};
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if (WARN((val_a & (~0 << bits)) || (val_b & (~0 << bits)),
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"Using more than %u bits of sleep control values %#x/%#x!"
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"Email xen-devel@lists.xen.org - Thank you.\n", \
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bits, val_a, val_b))
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return -1;
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HYPERVISOR_dom0_op(&op);
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return 1;
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}
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int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
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u32 pm1a_cnt, u32 pm1b_cnt)
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{
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return xen_acpi_notify_hypervisor_state(sleep_state, pm1a_cnt,
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pm1b_cnt, false);
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}
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int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
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u32 val_a, u32 val_b)
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{
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return xen_acpi_notify_hypervisor_state(sleep_state, val_a,
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val_b, true);
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}
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