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 39 static 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 66 int 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 73 int 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 80 struct acpi_prt_entry { 81 struct acpi_pci_id id; 82 u8 pin; 83 acpi_handle link; 84 u32 index; 85 }; 86 87 int xen_acpi_get_gsi_info(struct pci_dev *dev, 88 int *gsi_out, 89 int *trigger_out, 90 int *polarity_out) 91 { 92 int gsi; 93 u8 pin; 94 struct acpi_prt_entry *entry; 95 int trigger = ACPI_LEVEL_SENSITIVE; 96 int 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 if (entry->link) 109 gsi = acpi_pci_link_allocate_irq(entry->link, 110 entry->index, 111 &trigger, &polarity, 112 NULL); 113 else 114 gsi = entry->index; 115 } else 116 gsi = -1; 117 118 if (gsi < 0) 119 return -EINVAL; 120 121 *gsi_out = gsi; 122 *trigger_out = trigger; 123 *polarity_out = polarity; 124 125 return 0; 126 } 127 EXPORT_SYMBOL_GPL(xen_acpi_get_gsi_info); 128 129 static get_gsi_from_sbdf_t get_gsi_from_sbdf; 130 static DEFINE_RWLOCK(get_gsi_from_sbdf_lock); 131 132 void xen_acpi_register_get_gsi_func(get_gsi_from_sbdf_t func) 133 { 134 write_lock(&get_gsi_from_sbdf_lock); 135 get_gsi_from_sbdf = func; 136 write_unlock(&get_gsi_from_sbdf_lock); 137 } 138 EXPORT_SYMBOL_GPL(xen_acpi_register_get_gsi_func); 139 140 int xen_acpi_get_gsi_from_sbdf(u32 sbdf) 141 { 142 int ret = -EOPNOTSUPP; 143 144 read_lock(&get_gsi_from_sbdf_lock); 145 if (get_gsi_from_sbdf) 146 ret = get_gsi_from_sbdf(sbdf); 147 read_unlock(&get_gsi_from_sbdf_lock); 148 149 return ret; 150 } 151 EXPORT_SYMBOL_GPL(xen_acpi_get_gsi_from_sbdf); 152