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

     /*-
      * Copyright (c) 2000 Michael Smith
      * Copyright (c) 2000 BSDi
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: src/sys/dev/acpica/acpi_pcib.c,v 1.60.8.1 2009/04/15 03:14:26 kensmith Exp $
     */
    
    #include "opt_acpi.h"
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/malloc.h>
    #include <sys/kernel.h>
    #include <sys/machintr.h>
    #include <machine/smp.h>
    
    #include "acpi.h"
    #include <dev/acpica/acpivar.h>
    #include <dev/acpica/acpi_pcibvar.h>
    
    #include <bus/pci/pcivar.h>
    #include <bus/pci/pcireg.h>
    #include <bus/pci/pci_cfgreg.h>
    #include "pcib_if.h"
    
    /* Hooks for the ACPI CA debugging infrastructure. */
    #define _COMPONENT      ACPI_BUS
    ACPI_MODULE_NAME("PCI")
    
    ACPI_SERIAL_DECL(pcib, "ACPI PCI bus methods");
    
    /*
     * For locking, we assume the caller is not concurrent since this is
     * triggered by newbus methods.
     */
    
    struct prt_lookup_request {
        ACPI_PCI_ROUTING_TABLE *pr_entry;
        u_int       pr_pin;
        u_int       pr_slot;
    };
    
    typedef void prt_entry_handler(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
    
    static void     prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
    static void     prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg);
    static void     prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler,
                        void *arg);
    
    static void
    prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler, void *arg)
    {
        ACPI_PCI_ROUTING_TABLE *entry;
        char *prtptr;
    
        /* First check to see if there is a table to walk. */
        if (prt == NULL || prt->Pointer == NULL)
            return;
    
        /* Walk the table executing the handler function for each entry. */
        prtptr = prt->Pointer;
        entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
        while (entry->Length != 0) {
            handler(entry, arg);
            prtptr += entry->Length;
            entry = (ACPI_PCI_ROUTING_TABLE *)prtptr;
        }
    }
    
    static void
    prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
    {
        ACPI_HANDLE handle;
        device_t child, pcib;
        int error;
    
        /* We only care about entries that reference a link device. */
        if (entry->Source == NULL || entry->Source[0] == '\0')
           return;
   
       /*
        * In practice, we only see SourceIndex's of 0 out in the wild.
        * When indices != 0 have been found, they've been bugs in the ASL.
        */
       if (entry->SourceIndex != 0)
           return;
   
       /* Lookup the associated handle and device. */
       pcib = (device_t)arg;
       if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, entry->Source, &handle)))
           return;
       child = acpi_get_device(handle);
       if (child == NULL)
           return;
   
       /* If the device hasn't been probed yet, force it to do so. */
       error = device_probe_and_attach(child);
       if (error != 0) {
           device_printf(pcib, "failed to force attach of %s\n",
               acpi_name(handle));
           return;
       }
   
       /* Add a reference for a specific bus/device/pin tuple. */
       acpi_pci_link_add_reference(child, entry->SourceIndex, pcib,
           ACPI_ADR_PCI_SLOT(entry->Address), entry->Pin);
   }
   
   int
   acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
   {
       device_t                    child;
       ACPI_STATUS                 status;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       if (!acpi_DeviceIsPresent(dev)) {
           /* Caller should already have checked it */
           panic("%s device is not present", __func__);
       }
   
       ACPI_SERIAL_INIT(pcib);
   
       /*
        * Get the PCI interrupt routing table for this bus.  If we can't
        * get it, this is not an error but may reduce functionality.  There
        * are several valid bridges in the field that do not have a _PRT, so
        * only warn about missing tables if bootverbose is set.
        */
       prt->Length = ACPI_ALLOCATE_BUFFER;
       status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
       if (ACPI_FAILURE(status) && (bootverbose || status != AE_NOT_FOUND))
           device_printf(dev,
               "could not get PCI interrupt routing table for %s - %s\n",
               acpi_name(acpi_get_handle(dev)), AcpiFormatException(status));
   
       /*
        * Attach the PCI bus proper.
        */
       if ((child = device_add_child(dev, "pci", busno)) == NULL) {
           device_printf(device_get_parent(dev), "couldn't attach pci bus\n");
           return_VALUE(ENXIO);
       }
   
       /*
        * Now go scan the bus.
        */
       prt_walk_table(prt, prt_attach_devices, dev);
   
       return_VALUE (bus_generic_attach(dev));
   }
   
   int
   acpi_pcib_resume(device_t dev)
   {
   
       return (bus_generic_resume(dev));
   }
   
   static void
   prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg)
   {
       struct prt_lookup_request *pr;
   
       pr = (struct prt_lookup_request *)arg;
       if (pr->pr_entry != NULL)
           return;
   
       /*
        * Compare the slot number (high word of Address) and pin number
        * (note that ACPI uses 0 for INTA) to check for a match.
        *
        * Note that the low word of the Address field (function number)
        * is required by the specification to be 0xffff.  We don't risk
        * checking it here.
        */
       if (ACPI_ADR_PCI_SLOT(entry->Address) == pr->pr_slot &&
           entry->Pin == pr->pr_pin)
               pr->pr_entry = entry;
   }
   
   /*
    * Route an interrupt for a child of the bridge.
    */
   int
   acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
       ACPI_BUFFER *prtbuf)
   {
       ACPI_PCI_ROUTING_TABLE *prt;
       struct prt_lookup_request pr;
       ACPI_HANDLE lnkdev;
       int interrupt;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       interrupt = PCI_INVALID_IRQ;
   
       /* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
       pin--;
   
       ACPI_SERIAL_BEGIN(pcib);
   
       /* Search for a matching entry in the routing table. */
       pr.pr_entry = NULL;
       pr.pr_pin = pin;
       pr.pr_slot = pci_get_slot(dev);
       prt_walk_table(prtbuf, prt_lookup_device, &pr);
       if (pr.pr_entry == NULL) {
           device_printf(pcib, "no PRT entry for %d.%d.INT%c\n", pci_get_bus(dev),
               pci_get_slot(dev), 'A' + pin);
           goto out;
       }
       prt = pr.pr_entry;
   
       if (bootverbose) {
           device_printf(pcib, "matched entry for %d.%d.INT%c",
               pci_get_bus(dev), pci_get_slot(dev), 'A' + pin);
           if (prt->Source != NULL && prt->Source[0] != '\0')
                   kprintf(" (src %s:%u)", prt->Source, prt->SourceIndex);
           kprintf("\n");
       }
   
       /*
        * If source is empty/NULL, the source index is a GSI and it's hardwired
        * so we're done.
        *
        * XXX: If the source index is non-zero, ignore the source device and
        * assume that this is a hardwired entry.
        */
       if (prt->Source == NULL || prt->Source[0] == '\0' ||
           prt->SourceIndex != 0) {
           if (prt->SourceIndex) {
               interrupt = machintr_legacy_intr_find_bygsi(prt->SourceIndex,
                   INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
               if (interrupt < 0) {
                   device_printf(pcib, "slot %d INT%c hardwired to "
                       "invalid GSI %d\n", pci_get_slot(dev), 'A' + pin,
                       prt->SourceIndex);
                   interrupt = PCI_INVALID_IRQ;
                   goto out;
               }
               if (bootverbose) {
                   device_printf(pcib, "slot %d INT%c hardwired to "
                       "GSI %d, IRQ %d\n", pci_get_slot(dev), 'A' + pin,
                       prt->SourceIndex, interrupt);
               }
   
               BUS_CONFIG_INTR(device_get_parent(dev), dev, interrupt,
                   INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW);
           } else {
               device_printf(pcib, "invalid hardwired GSI 0\n");
           }
           goto out;
       }
   
       /*
        * We have to find the source device (PCI interrupt link device).
        */
       if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
           device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
               prt->Source);
           goto out;
       }
       interrupt = acpi_pci_link_route_interrupt(acpi_get_device(lnkdev),
           prt->SourceIndex);
   
       if (bootverbose && PCI_INTERRUPT_VALID(interrupt)) {
           device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n",
               pci_get_slot(dev), 'A' + pin, interrupt, acpi_name(lnkdev));
       }
   
   out:
       ACPI_SERIAL_END(pcib);
   
       return_VALUE (interrupt);
   }
   
   int
   acpi_pcib_probe(device_t dev)
   {
       /*
        * Don't attach if we're not really there.
        *
        * XXX: This isn't entirely correct since we may be a PCI bus
        * on a hot-plug docking station, etc.
        */
       if (!acpi_DeviceIsPresent(dev))
           return ENXIO;
   
       if (pci_cfgregopen() == 0)
           return ENXIO;
   
       return 0;
   }

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