Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/******************************************************************************
2 * acpi.c
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#include <linux/pci.h>
34#include <xen/acpi.h>
35#include <xen/interface/platform.h>
36#include <asm/xen/hypercall.h>
37#include <asm/xen/hypervisor.h>
38
39static int xen_acpi_notify_hypervisor_state(u8 sleep_state,
40 u32 val_a, u32 val_b,
41 bool extended)
42{
43 unsigned int bits = extended ? 8 : 16;
44
45 struct xen_platform_op op = {
46 .cmd = XENPF_enter_acpi_sleep,
47 .interface_version = XENPF_INTERFACE_VERSION,
48 .u.enter_acpi_sleep = {
49 .val_a = (u16)val_a,
50 .val_b = (u16)val_b,
51 .sleep_state = sleep_state,
52 .flags = extended ? XENPF_ACPI_SLEEP_EXTENDED : 0,
53 },
54 };
55
56 if (WARN((val_a & (~0 << bits)) || (val_b & (~0 << bits)),
57 "Using more than %u bits of sleep control values %#x/%#x!"
58 "Email xen-devel@lists.xen.org - Thank you.\n", \
59 bits, val_a, val_b))
60 return -1;
61
62 HYPERVISOR_platform_op(&op);
63 return 1;
64}
65
66int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
67 u32 pm1a_cnt, u32 pm1b_cnt)
68{
69 return xen_acpi_notify_hypervisor_state(sleep_state, pm1a_cnt,
70 pm1b_cnt, false);
71}
72
73int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
74 u32 val_a, u32 val_b)
75{
76 return xen_acpi_notify_hypervisor_state(sleep_state, val_a,
77 val_b, true);
78}
79
80struct acpi_prt_entry {
81 struct acpi_pci_id id;
82 u8 pin;
83 acpi_handle link;
84 u32 index;
85};
86
87int xen_acpi_get_gsi_info(struct pci_dev *dev,
88 int *gsi_out,
89 int *trigger_out,
90 int *polarity_out)
91{
92 u32 gsi;
93 u8 pin;
94 struct acpi_prt_entry *entry;
95 int trigger = ACPI_LEVEL_SENSITIVE;
96 int ret, polarity = acpi_irq_model == ACPI_IRQ_MODEL_GIC ?
97 ACPI_ACTIVE_HIGH : ACPI_ACTIVE_LOW;
98
99 if (!dev || !gsi_out || !trigger_out || !polarity_out)
100 return -EINVAL;
101
102 pin = dev->pin;
103 if (!pin)
104 return -EINVAL;
105
106 entry = acpi_pci_irq_lookup(dev, pin);
107 if (entry) {
108 ret = 0;
109 if (entry->link)
110 ret = acpi_pci_link_allocate_irq(entry->link,
111 entry->index,
112 &trigger, &polarity,
113 NULL, &gsi);
114 else
115 gsi = entry->index;
116 } else
117 ret = -ENODEV;
118
119 if (ret < 0)
120 return -EINVAL;
121
122 *gsi_out = gsi;
123 *trigger_out = trigger;
124 *polarity_out = polarity;
125
126 return 0;
127}
128EXPORT_SYMBOL_GPL(xen_acpi_get_gsi_info);
129
130static get_gsi_from_sbdf_t get_gsi_from_sbdf;
131static DEFINE_RWLOCK(get_gsi_from_sbdf_lock);
132
133void xen_acpi_register_get_gsi_func(get_gsi_from_sbdf_t func)
134{
135 write_lock(&get_gsi_from_sbdf_lock);
136 get_gsi_from_sbdf = func;
137 write_unlock(&get_gsi_from_sbdf_lock);
138}
139EXPORT_SYMBOL_GPL(xen_acpi_register_get_gsi_func);
140
141int xen_acpi_get_gsi_from_sbdf(u32 sbdf)
142{
143 int ret = -EOPNOTSUPP;
144
145 read_lock(&get_gsi_from_sbdf_lock);
146 if (get_gsi_from_sbdf)
147 ret = get_gsi_from_sbdf(sbdf);
148 read_unlock(&get_gsi_from_sbdf_lock);
149
150 return ret;
151}
152EXPORT_SYMBOL_GPL(xen_acpi_get_gsi_from_sbdf);