The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_pci.c

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    1 /*-
    2  * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
    3  * Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
    4  * Copyright (c) 2000, BSDi
    5  * All rights reserved.
    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  * 1. Redistributions of source code must retain the above copyright
   11  *    notice unmodified, this list of conditions, and the following
   12  *    disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: releng/9.0/sys/dev/acpica/acpi_pci.c 223207 2011-06-17 21:19:01Z jhb $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/kernel.h>
   36 #include <sys/malloc.h>
   37 #include <sys/module.h>
   38 
   39 #include <contrib/dev/acpica/include/acpi.h>
   40 #include <contrib/dev/acpica/include/accommon.h>
   41 
   42 #include <dev/acpica/acpivar.h>
   43 
   44 #include <sys/pciio.h>
   45 #include <dev/pci/pcireg.h>
   46 #include <dev/pci/pcivar.h>
   47 #include <dev/pci/pci_private.h>
   48 
   49 #include "pcib_if.h"
   50 #include "pci_if.h"
   51 
   52 /* Hooks for the ACPI CA debugging infrastructure. */
   53 #define _COMPONENT      ACPI_BUS
   54 ACPI_MODULE_NAME("PCI")
   55 
   56 struct acpi_pci_devinfo {
   57         struct pci_devinfo      ap_dinfo;
   58         ACPI_HANDLE             ap_handle;
   59         int                     ap_flags;
   60 };
   61 
   62 ACPI_SERIAL_DECL(pci_powerstate, "ACPI PCI power methods");
   63 
   64 /* Be sure that ACPI and PCI power states are equivalent. */
   65 CTASSERT(ACPI_STATE_D0 == PCI_POWERSTATE_D0);
   66 CTASSERT(ACPI_STATE_D1 == PCI_POWERSTATE_D1);
   67 CTASSERT(ACPI_STATE_D2 == PCI_POWERSTATE_D2);
   68 CTASSERT(ACPI_STATE_D3 == PCI_POWERSTATE_D3);
   69 
   70 static int      acpi_pci_attach(device_t dev);
   71 static int      acpi_pci_child_location_str_method(device_t cbdev,
   72                     device_t child, char *buf, size_t buflen);
   73 static int      acpi_pci_probe(device_t dev);
   74 static int      acpi_pci_read_ivar(device_t dev, device_t child, int which,
   75                     uintptr_t *result);
   76 static int      acpi_pci_write_ivar(device_t dev, device_t child, int which,
   77                     uintptr_t value);
   78 static ACPI_STATUS acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level,
   79                     void *context, void **status);
   80 static int      acpi_pci_set_powerstate_method(device_t dev, device_t child,
   81                     int state);
   82 static void     acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child);
   83 
   84 static device_method_t acpi_pci_methods[] = {
   85         /* Device interface */
   86         DEVMETHOD(device_probe,         acpi_pci_probe),
   87         DEVMETHOD(device_attach,        acpi_pci_attach),
   88 
   89         /* Bus interface */
   90         DEVMETHOD(bus_read_ivar,        acpi_pci_read_ivar),
   91         DEVMETHOD(bus_write_ivar,       acpi_pci_write_ivar),
   92         DEVMETHOD(bus_child_location_str, acpi_pci_child_location_str_method),
   93 
   94         /* PCI interface */
   95         DEVMETHOD(pci_set_powerstate,   acpi_pci_set_powerstate_method),
   96 
   97         { 0, 0 }
   98 };
   99 
  100 static devclass_t pci_devclass;
  101 
  102 DEFINE_CLASS_1(pci, acpi_pci_driver, acpi_pci_methods, 0, pci_driver);
  103 DRIVER_MODULE(acpi_pci, pcib, acpi_pci_driver, pci_devclass, 0, 0);
  104 MODULE_DEPEND(acpi_pci, acpi, 1, 1, 1);
  105 MODULE_DEPEND(acpi_pci, pci, 1, 1, 1);
  106 MODULE_VERSION(acpi_pci, 1);
  107 
  108 static int
  109 acpi_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  110 {
  111     struct acpi_pci_devinfo *dinfo;
  112 
  113     dinfo = device_get_ivars(child);
  114     switch (which) {
  115     case ACPI_IVAR_HANDLE:
  116         *result = (uintptr_t)dinfo->ap_handle;
  117         return (0);
  118     case ACPI_IVAR_FLAGS:
  119         *result = (uintptr_t)dinfo->ap_flags;
  120         return (0);
  121     }
  122     return (pci_read_ivar(dev, child, which, result));
  123 }
  124 
  125 static int
  126 acpi_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  127 {
  128     struct acpi_pci_devinfo *dinfo;
  129 
  130     dinfo = device_get_ivars(child);
  131     switch (which) {
  132     case ACPI_IVAR_HANDLE:
  133         dinfo->ap_handle = (ACPI_HANDLE)value;
  134         return (0);
  135     case ACPI_IVAR_FLAGS:
  136         dinfo->ap_flags = (int)value;
  137         return (0);
  138     }
  139     return (pci_write_ivar(dev, child, which, value));
  140 }
  141 
  142 static int
  143 acpi_pci_child_location_str_method(device_t cbdev, device_t child, char *buf,
  144     size_t buflen)
  145 {
  146     struct acpi_pci_devinfo *dinfo = device_get_ivars(child);
  147 
  148     pci_child_location_str_method(cbdev, child, buf, buflen);
  149     
  150     if (dinfo->ap_handle) {
  151         strlcat(buf, " handle=", buflen);
  152         strlcat(buf, acpi_name(dinfo->ap_handle), buflen);
  153     }
  154     return (0);
  155 }
  156 
  157 /*
  158  * PCI power manangement
  159  */
  160 static int
  161 acpi_pci_set_powerstate_method(device_t dev, device_t child, int state)
  162 {
  163         ACPI_HANDLE h;
  164         ACPI_STATUS status;
  165         int old_state, error;
  166 
  167         error = 0;
  168         if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3)
  169                 return (EINVAL);
  170 
  171         /*
  172          * We set the state using PCI Power Management outside of setting
  173          * the ACPI state.  This means that when powering down a device, we
  174          * first shut it down using PCI, and then using ACPI, which lets ACPI
  175          * try to power down any Power Resources that are now no longer used.
  176          * When powering up a device, we let ACPI set the state first so that
  177          * it can enable any needed Power Resources before changing the PCI
  178          * power state.
  179          */
  180         ACPI_SERIAL_BEGIN(pci_powerstate);
  181         old_state = pci_get_powerstate(child);
  182         if (old_state < state && pci_do_power_suspend) {
  183                 error = pci_set_powerstate_method(dev, child, state);
  184                 if (error)
  185                         goto out;
  186         }
  187         h = acpi_get_handle(child);
  188         status = acpi_pwr_switch_consumer(h, state);
  189         if (ACPI_SUCCESS(status)) {
  190                 if (bootverbose)
  191                         device_printf(dev, "set ACPI power state D%d on %s\n",
  192                             state, acpi_name(h));
  193         } else if (status != AE_NOT_FOUND)
  194                 device_printf(dev,
  195                     "failed to set ACPI power state D%d on %s: %s\n",
  196                     state, acpi_name(h), AcpiFormatException(status));
  197         if (old_state > state && pci_do_power_resume)
  198                 error = pci_set_powerstate_method(dev, child, state);
  199 
  200 out:
  201         ACPI_SERIAL_END(pci_powerstate);
  202         return (error);
  203 }
  204 
  205 static void
  206 acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child)
  207 {
  208         ACPI_STATUS status;
  209         device_t child;
  210 
  211         /*
  212          * Occasionally a PCI device may show up as an ACPI device
  213          * with a _HID.  (For example, the TabletPC TC1000 has a
  214          * second PCI-ISA bridge that has a _HID for an
  215          * acpi_sysresource device.)  In that case, leave ACPI-CA's
  216          * device data pointing at the ACPI-enumerated device.
  217          */
  218         child = acpi_get_device(handle);
  219         if (child != NULL) {
  220                 KASSERT(device_get_parent(child) ==
  221                     devclass_get_device(devclass_find("acpi"), 0),
  222                     ("%s: child (%s)'s parent is not acpi0", __func__,
  223                     acpi_name(handle)));
  224                 return;
  225         }
  226 
  227         /*
  228          * Update ACPI-CA to use the PCI enumerated device_t for this handle.
  229          */
  230         status = AcpiAttachData(handle, acpi_fake_objhandler, pci_child);
  231         if (ACPI_FAILURE(status))
  232                 printf("WARNING: Unable to attach object data to %s - %s\n",
  233                     acpi_name(handle), AcpiFormatException(status));
  234 }
  235 
  236 static ACPI_STATUS
  237 acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level, void *context,
  238     void **status)
  239 {
  240         struct acpi_pci_devinfo *dinfo;
  241         device_t *devlist;
  242         int devcount, i, func, slot;
  243         UINT32 address;
  244 
  245         ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
  246 
  247         if (ACPI_FAILURE(acpi_GetInteger(handle, "_ADR", &address)))
  248                 return_ACPI_STATUS (AE_OK);
  249         slot = ACPI_ADR_PCI_SLOT(address);
  250         func = ACPI_ADR_PCI_FUNC(address);
  251         if (device_get_children((device_t)context, &devlist, &devcount) != 0)
  252                 return_ACPI_STATUS (AE_OK);
  253         for (i = 0; i < devcount; i++) {
  254                 dinfo = device_get_ivars(devlist[i]);
  255                 if (dinfo->ap_dinfo.cfg.func == func &&
  256                     dinfo->ap_dinfo.cfg.slot == slot) {
  257                         dinfo->ap_handle = handle;
  258                         acpi_pci_update_device(handle, devlist[i]);
  259                         break;
  260                 }
  261         }
  262         free(devlist, M_TEMP);
  263         return_ACPI_STATUS (AE_OK);
  264 }
  265 
  266 static int
  267 acpi_pci_probe(device_t dev)
  268 {
  269 
  270         if (acpi_get_handle(dev) == NULL)
  271                 return (ENXIO);
  272         device_set_desc(dev, "ACPI PCI bus");
  273         return (0);
  274 }
  275 
  276 static int
  277 acpi_pci_attach(device_t dev)
  278 {
  279         int busno, domain;
  280 
  281         /*
  282          * Since there can be multiple independantly numbered PCI
  283          * busses on systems with multiple PCI domains, we can't use
  284          * the unit number to decide which bus we are probing. We ask
  285          * the parent pcib what our domain and bus numbers are.
  286          */
  287         domain = pcib_get_domain(dev);
  288         busno = pcib_get_bus(dev);
  289         if (bootverbose)
  290                 device_printf(dev, "domain=%d, physical bus=%d\n",
  291                     domain, busno);
  292 
  293         /*
  294          * First, PCI devices are added as in the normal PCI bus driver.
  295          * Afterwards, the ACPI namespace under the bridge driver is
  296          * walked to save ACPI handles to all the devices that appear in
  297          * the ACPI namespace as immediate descendants of the bridge.
  298          *
  299          * XXX: Sometimes PCI devices show up in the ACPI namespace that
  300          * pci_add_children() doesn't find.  We currently just ignore
  301          * these devices.
  302          */
  303         pci_add_children(dev, domain, busno, sizeof(struct acpi_pci_devinfo));
  304         AcpiWalkNamespace(ACPI_TYPE_DEVICE, acpi_get_handle(dev), 1,
  305             acpi_pci_save_handle, NULL, dev, NULL);
  306 
  307         return (bus_generic_attach(dev));
  308 }

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