1 /******************************************************************************
2  * acpi.h
3  * acpi file for domain 0 kernel
4  *
5  * Copyright (c) 2011 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
6  * Copyright (c) 2011 Yu Ke <ke.yu@intel.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License version 2
10  * as published by the Free Software Foundation; or, when distributed
11  * separately from the Linux kernel or incorporated into other
12  * software packages, subject to the following license:
13  *
14  * Permission is hereby granted, free of charge, to any person obtaining a copy
15  * of this source file (the "Software"), to deal in the Software without
16  * restriction, including without limitation the rights to use, copy, modify,
17  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
18  * and to permit persons to whom the Software is furnished to do so, subject to
19  * the following conditions:
20  *
21  * The above copyright notice and this permission notice shall be included in
22  * all copies or substantial portions of the Software.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30  * IN THE SOFTWARE.
31  */
32 
33 #ifndef _XEN_ACPI_H
34 #define _XEN_ACPI_H
35 
36 #include <linux/types.h>
37 
38 #ifdef CONFIG_XEN_DOM0
39 #include <asm/xen/hypervisor.h>
40 #include <xen/xen.h>
41 #include <linux/acpi.h>
42 
43 #define ACPI_MEMORY_DEVICE_CLASS        "memory"
44 #define ACPI_MEMORY_DEVICE_HID          "PNP0C80"
45 #define ACPI_MEMORY_DEVICE_NAME         "Hotplug Mem Device"
46 
47 int xen_stub_memory_device_init(void);
48 void xen_stub_memory_device_exit(void);
49 
50 #define ACPI_PROCESSOR_CLASS            "processor"
51 #define ACPI_PROCESSOR_DEVICE_HID       "ACPI0007"
52 #define ACPI_PROCESSOR_DEVICE_NAME      "Processor"
53 
54 int xen_stub_processor_init(void);
55 void xen_stub_processor_exit(void);
56 
57 void xen_pcpu_hotplug_sync(void);
58 int xen_pcpu_id(uint32_t acpi_id);
59 
xen_acpi_get_pxm(acpi_handle h)60 static inline int xen_acpi_get_pxm(acpi_handle h)
61 {
62 	unsigned long long pxm;
63 	acpi_status status;
64 	acpi_handle handle;
65 	acpi_handle phandle = h;
66 
67 	do {
68 		handle = phandle;
69 		status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
70 		if (ACPI_SUCCESS(status))
71 			return pxm;
72 		status = acpi_get_parent(handle, &phandle);
73 	} while (ACPI_SUCCESS(status));
74 
75 	return -ENXIO;
76 }
77 
78 int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
79 				     u32 pm1a_cnt, u32 pm1b_cnd);
80 int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
81 				     u32 val_a, u32 val_b);
82 
xen_acpi_suspend_lowlevel(void)83 static inline int xen_acpi_suspend_lowlevel(void)
84 {
85 	/*
86 	* Xen will save and restore CPU context, so
87 	* we can skip that and just go straight to
88 	* the suspend.
89 	*/
90 	acpi_enter_sleep_state(ACPI_STATE_S3);
91 	return 0;
92 }
93 
xen_acpi_sleep_register(void)94 static inline void xen_acpi_sleep_register(void)
95 {
96 	if (xen_initial_domain()) {
97 		acpi_os_set_prepare_sleep(
98 			&xen_acpi_notify_hypervisor_sleep);
99 		acpi_os_set_prepare_extended_sleep(
100 			&xen_acpi_notify_hypervisor_extended_sleep);
101 
102 		acpi_suspend_lowlevel = xen_acpi_suspend_lowlevel;
103 	}
104 }
105 #else
xen_acpi_sleep_register(void)106 static inline void xen_acpi_sleep_register(void)
107 {
108 }
109 #endif
110 
111 #endif	/* _XEN_ACPI_H */
112