sys/dev/acpica/acpi_pvpanic/acpi_pvpanic.c

   1 /*
   2  * Copyright (c) 2015 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Imre Vadász <imre@vdsz.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include "opt_acpi.h"
  36 #include <sys/param.h>
  37 #include <sys/kernel.h>
  38 #include <sys/module.h>
  39 #include <sys/bus.h>
  40 #include <sys/rman.h>
  41 #include <dev/acpica/acpi_pvpanic/panic_notifier.h>
  42
  43 #include "acpi.h"
  44
  45 #include <dev/acpica/acpivar.h>
  46
  47 #define PVPANIC_GUESTPANIC      (1 << 0)
  48
  49 ACPI_MODULE_NAME("pvpanic")
  50
  51 struct acpi_pvpanic_softc {
  52         device_t                dev;
  53         ACPI_HANDLE             handle;
  54         int                     pvpanic_port_rid;
  55         struct resource         *pvpanic_port_res;
  56         bus_space_tag_t         pvpanic_iot;
  57         bus_space_handle_t      pvpanic_ioh;
  58         struct panicerinfo      pvpanic_info;
  59 };
  60
  61 static int      acpi_pvpanic_probe(device_t dev);
  62 static int      acpi_pvpanic_attach(device_t dev);
  63 static int      acpi_pvpanic_detach(device_t dev);
  64 static void     acpi_pvpanic_panic(void *arg);
  65
  66 static device_method_t acpi_pvpanic_methods[] = {
  67         DEVMETHOD(device_probe,         acpi_pvpanic_probe),
  68         DEVMETHOD(device_attach,        acpi_pvpanic_attach),
  69         DEVMETHOD(device_detach,        acpi_pvpanic_detach),
  70
  71         DEVMETHOD_END
  72 };
  73
  74 static driver_t acpi_pvpanic_driver = {
  75         "acpi_pvpanic",
  76         acpi_pvpanic_methods,
  77         sizeof(struct acpi_pvpanic_softc),
  78 };
  79
  80 static devclass_t acpi_pvpanic_devclass;
  81 DRIVER_MODULE(acpi_pvpanic, acpi, acpi_pvpanic_driver, acpi_pvpanic_devclass,
  82     NULL, NULL);
  83 MODULE_DEPEND(acpi_pvpanic, acpi, 1, 1, 1);
  84 MODULE_VERSION(acpi_pvpanic, 1);
  85
  86 static int
  87 acpi_pvpanic_probe(device_t dev)
  88 {
  89         static char *pvpanic_ids[] = { "QEMU0001", NULL };
  90
  91         if (acpi_disabled("pvpanic") ||
  92             ACPI_ID_PROBE(device_get_parent(dev), dev, pvpanic_ids) == NULL ||
  93             device_get_unit(dev) != 0)
  94                 return (ENXIO);
  95
  96         device_set_desc(dev, "Qemu pvpanic device");
  97         return (0);
  98 }
  99
 100 static int
 101 acpi_pvpanic_attach(device_t dev)
 102 {
 103         struct  acpi_pvpanic_softc *sc;
 104         uint8_t val;
 105
 106         sc = device_get_softc(dev);
 107         sc->dev = dev;
 108         sc->handle = acpi_get_handle(dev);
 109
 110         sc->pvpanic_port_rid = 0;
 111         sc->pvpanic_port_res = bus_alloc_resource_any(sc->dev, SYS_RES_IOPORT,
 112             &sc->pvpanic_port_rid, RF_ACTIVE);
 113         if (sc->pvpanic_port_res == NULL) {
 114                 device_printf(dev, "can't allocate pvpanic port\n");
 115                 return ENXIO;
 116         }
 117         sc->pvpanic_iot = rman_get_bustag(sc->pvpanic_port_res);
 118         sc->pvpanic_ioh = rman_get_bushandle(sc->pvpanic_port_res);
 119
 120         /* Check for guest panic notification support */
 121         val = bus_space_read_1(sc->pvpanic_iot, sc->pvpanic_ioh, 0);
 122         if (!(val & PVPANIC_GUESTPANIC)) {
 123                 device_printf(dev, "No PVPANIC_GUESTPANIC support\n");
 124                 goto fail;
 125         }
 126
 127         device_printf(dev, "Registering panic callback\n");
 128         sc->pvpanic_info.notifier = acpi_pvpanic_panic;
 129         sc->pvpanic_info.arg = sc;
 130         if (set_panic_notifier(&sc->pvpanic_info) != 0) {
 131                 device_printf(dev, "Failed to register panic notifier\n");
 132                 goto fail;
 133         }
 134         return (0);
 135
 136 fail:
 137         bus_release_resource(dev, SYS_RES_IOPORT,
 138             sc->pvpanic_port_rid, sc->pvpanic_port_res);
 139         return ENXIO;
 140 }
 141
 142 static int
 143 acpi_pvpanic_detach(device_t dev)
 144 {
 145         struct  acpi_pvpanic_softc *sc = device_get_softc(dev);
 146
 147         set_panic_notifier(NULL);
 148
 149         bus_release_resource(dev, SYS_RES_IOPORT,
 150             sc->pvpanic_port_rid, sc->pvpanic_port_res);
 151
 152         return (0);
 153 }
 154
 155 static void
 156 acpi_pvpanic_panic(void *arg)
 157 {
 158         struct acpi_pvpanic_softc *sc = (struct acpi_pvpanic_softc *)arg;
 159
 160         bus_space_write_1(sc->pvpanic_iot, sc->pvpanic_ioh, 0,
 161             PVPANIC_GUESTPANIC);
 162 }