drivers/xen/acpi.c

0001 /******************************************************************************
0002  * acpi.c
0003  * acpi file for domain 0 kernel
0004  *
0005  * Copyright (c) 2011 Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
0006  * Copyright (c) 2011 Yu Ke ke.yu@intel.com
0007  *
0008  * This program is free software; you can redistribute it and/or
0009  * modify it under the terms of the GNU General Public License version 2
0010  * as published by the Free Software Foundation; or, when distributed
0011  * separately from the Linux kernel or incorporated into other
0012  * software packages, subject to the following license:
0013  *
0014  * Permission is hereby granted, free of charge, to any person obtaining a copy
0015  * of this source file (the "Software"), to deal in the Software without
0016  * restriction, including without limitation the rights to use, copy, modify,
0017  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
0018  * and to permit persons to whom the Software is furnished to do so, subject to
0019  * the following conditions:
0020  *
0021  * The above copyright notice and this permission notice shall be included in
0022  * all copies or substantial portions of the Software.
0023  *
0024  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0025  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0026  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
0027  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
0028  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
0029  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
0030  * IN THE SOFTWARE.
0031  */
0032
0033 #include <xen/acpi.h>
0034 #include <xen/interface/platform.h>
0035 #include <asm/xen/hypercall.h>
0036 #include <asm/xen/hypervisor.h>
0037
0038 static int xen_acpi_notify_hypervisor_state(u8 sleep_state,
0039                         u32 val_a, u32 val_b,
0040                         bool extended)
0041 {
0042     unsigned int bits = extended ? 8 : 16;
0043
0044     struct xen_platform_op op = {
0045         .cmd = XENPF_enter_acpi_sleep,
0046         .interface_version = XENPF_INTERFACE_VERSION,
0047         .u.enter_acpi_sleep = {
0048             .val_a = (u16)val_a,
0049             .val_b = (u16)val_b,
0050             .sleep_state = sleep_state,
0051             .flags = extended ? XENPF_ACPI_SLEEP_EXTENDED : 0,
0052         },
0053     };
0054
0055     if (WARN((val_a & (~0 << bits)) || (val_b & (~0 << bits)),
0056          "Using more than %u bits of sleep control values %#x/%#x!"
0057          "Email xen-devel@lists.xen.org - Thank you.\n", \
0058          bits, val_a, val_b))
0059         return -1;
0060
0061     HYPERVISOR_platform_op(&op);
0062     return 1;
0063 }
0064
0065 int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
0066                      u32 pm1a_cnt, u32 pm1b_cnt)
0067 {
0068     return xen_acpi_notify_hypervisor_state(sleep_state, pm1a_cnt,
0069                         pm1b_cnt, false);
0070 }
0071
0072 int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
0073                      u32 val_a, u32 val_b)
0074 {
0075     return xen_acpi_notify_hypervisor_state(sleep_state, val_a,
0076                         val_b, true);
0077 }