drivers/xen/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 <xen/acpi.h>
  34 #include <xen/interface/platform.h>
  35 #include <asm/xen/hypercall.h>
  36 #include <asm/xen/hypervisor.h>
  37
  38 static int xen_acpi_notify_hypervisor_state(u8 sleep_state,
  39                                             u32 val_a, u32 val_b,
  40                                             bool extended)
  41 {
  42         unsigned int bits = extended ? 8 : 16;
  43
  44         struct xen_platform_op op = {
  45                 .cmd = XENPF_enter_acpi_sleep,
  46                 .interface_version = XENPF_INTERFACE_VERSION,
  47                 .u.enter_acpi_sleep = {
  48                         .val_a = (u16)val_a,
  49                         .val_b = (u16)val_b,
  50                         .sleep_state = sleep_state,
  51                         .flags = extended ? XENPF_ACPI_SLEEP_EXTENDED : 0,
  52                 },
  53         };
  54
  55         if (WARN((val_a & (~0 << bits)) || (val_b & (~0 << bits)),
  56                  "Using more than %u bits of sleep control values %#x/%#x!"
  57                  "Email xen-devel@lists.xen.org - Thank you.\n", \
  58                  bits, val_a, val_b))
  59                 return -1;
  60
  61         HYPERVISOR_platform_op(&op);
  62         return 1;
  63 }
  64
  65 int xen_acpi_notify_hypervisor_sleep(u8 sleep_state,
  66                                      u32 pm1a_cnt, u32 pm1b_cnt)
  67 {
  68         return xen_acpi_notify_hypervisor_state(sleep_state, pm1a_cnt,
  69                                                 pm1b_cnt, false);
  70 }
  71
  72 int xen_acpi_notify_hypervisor_extended_sleep(u8 sleep_state,
  73                                      u32 val_a, u32 val_b)
  74 {
  75         return xen_acpi_notify_hypervisor_state(sleep_state, val_a,
  76                                                 val_b, true);
  77 }