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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
112 lines
3.4 KiB
C
112 lines
3.4 KiB
C
/******************************************************************************
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* acpi.h
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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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#ifndef _XEN_ACPI_H
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#define _XEN_ACPI_H
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#include <linux/types.h>
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#ifdef CONFIG_XEN_DOM0
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#include <asm/xen/hypervisor.h>
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#include <xen/xen.h>
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#include <linux/acpi.h>
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#define ACPI_MEMORY_DEVICE_CLASS "memory"
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#define ACPI_MEMORY_DEVICE_HID "PNP0C80"
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#define ACPI_MEMORY_DEVICE_NAME "Hotplug Mem Device"
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int xen_stub_memory_device_init(void);
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void xen_stub_memory_device_exit(void);
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#define ACPI_PROCESSOR_CLASS "processor"
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#define ACPI_PROCESSOR_DEVICE_HID "ACPI0007"
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#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
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int xen_stub_processor_init(void);
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void xen_stub_processor_exit(void);
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void xen_pcpu_hotplug_sync(void);
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int xen_pcpu_id(uint32_t acpi_id);
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static inline int xen_acpi_get_pxm(acpi_handle h)
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{
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unsigned long long pxm;
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acpi_status status;
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acpi_handle handle;
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acpi_handle phandle = h;
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do {
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handle = phandle;
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status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
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if (ACPI_SUCCESS(status))
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return pxm;
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status = acpi_get_parent(handle, &phandle);
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} while (ACPI_SUCCESS(status));
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return -ENXIO;
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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_cnd);
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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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static inline int xen_acpi_suspend_lowlevel(void)
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{
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/*
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* Xen will save and restore CPU context, so
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* we can skip that and just go straight to
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* the suspend.
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*/
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acpi_enter_sleep_state(ACPI_STATE_S3);
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return 0;
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}
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static inline void xen_acpi_sleep_register(void)
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{
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if (xen_initial_domain()) {
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acpi_os_set_prepare_sleep(
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&xen_acpi_notify_hypervisor_sleep);
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acpi_os_set_prepare_extended_sleep(
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&xen_acpi_notify_hypervisor_extended_sleep);
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acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel;
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}
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}
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#else
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static inline void xen_acpi_sleep_register(void)
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{
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}
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#endif
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#endif /* _XEN_ACPI_H */
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