acpi.c

  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);