FreeBSD/Linux Kernel Cross Reference
sys/x86/pci/qpi.c

     /*-
      * Copyright (c) 2010 Hudson River Trading LLC
      * Written by: John H. Baldwin <jhb@FreeBSD.org>
      * 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.
     */
    
    /*
     * This driver provides a pseudo-bus to enumerate the PCI buses
     * present on a system using a QPI chipset.  It creates a qpi0 bus that
     * is a child of nexus0 and then creates Host-PCI bridges as a
     * child of that.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/module.h>
    #include <sys/rman.h>
    #include <sys/systm.h>
    
    #include <machine/cputypes.h>
    #include <machine/md_var.h>
    #include <x86/legacyvar.h>
    #include <x86/pci_cfgreg.h>
    #include <x86/specialreg.h>
    
    #include <dev/pci/pcireg.h>
    #include <dev/pci/pcivar.h>
    #include <dev/pci/pcib_private.h>
    #include "pcib_if.h"
    
    struct qpi_device {
            int     qd_pcibus;
    };
    
    static MALLOC_DEFINE(M_QPI, "qpidrv", "qpi system device");
    
    static void
    qpi_identify(driver_t *driver, device_t parent)
    {
            int do_qpi;
    
            /* Check CPUID to ensure this is an i7 CPU of some sort. */
            if (cpu_vendor_id != CPU_VENDOR_INTEL ||
                CPUID_TO_FAMILY(cpu_id) != 0x6)
                    return;
    
            /* Only discover buses with configuration devices if allowed by user */
            do_qpi = 0;
            TUNABLE_INT_FETCH("hw.attach_intel_csr_pci", &do_qpi);
            if (!do_qpi)
                    return;
    
            /* PCI config register access is required. */
            if (pci_cfgregopen() == 0)
                    return;
    
            /* Add a qpi bus device. */
            if (BUS_ADD_CHILD(parent, 20, "qpi", -1) == NULL)
                    panic("Failed to add qpi bus");
    }
    
    static int
    qpi_probe(device_t dev)
    {
    
            device_set_desc(dev, "QPI system bus");
            return (BUS_PROBE_SPECIFIC);
    }
    
    /*
     * Look for a PCI bus with the specified bus address.  If one is found,
     * add a pcib device and return 0.  Otherwise, return an error code.
     */
   static int
   qpi_probe_pcib(device_t dev, int bus)
   {
           struct qpi_device *qdev;
           device_t child;
           uint32_t devid;
           int s;
   
           /*
            * If a PCI bus already exists for this bus number, then
            * fail.
            */
           if (pci_find_bsf(bus, 0, 0) != NULL)
                   return (EEXIST);
   
           /*
            * Attempt to read the device id for every slot, function 0 on
            * the bus.  If all read values are 0xffffffff this means that
            * the bus is not present.
            */
           for (s = 0; s <= PCI_SLOTMAX; s++) {
                   devid = pci_cfgregread(bus, s, 0, PCIR_DEVVENDOR, 4);
                   if (devid != 0xffffffff)
                           break;
           }
           if (devid == 0xffffffff)
                   return (ENOENT);
   
           if ((devid & 0xffff) != 0x8086) {
                   if (bootverbose)
                           device_printf(dev,
                               "Device at pci%d.%d.0 has non-Intel vendor 0x%x\n",
                               bus, s, devid & 0xffff);
                   return (ENXIO);
           }
   
           child = BUS_ADD_CHILD(dev, 0, "pcib", -1);
           if (child == NULL)
                   panic("%s: failed to add pci bus %d", device_get_nameunit(dev),
                       bus);
           qdev = malloc(sizeof(struct qpi_device), M_QPI, M_WAITOK);
           qdev->qd_pcibus = bus;
           device_set_ivars(child, qdev);
           return (0);
   }
   
   static int
   qpi_attach(device_t dev)
   {
           int bus;
   
           /*
            * Each processor socket has a dedicated PCI bus, sometimes
            * not enumerated by ACPI.  Probe all unattached buses from 0
            * to 255.
            */
           for (bus = PCI_BUSMAX; bus >= 0; bus--)
                   qpi_probe_pcib(dev, bus);
   
           return (bus_generic_attach(dev));
   }
   
   static int
   qpi_print_child(device_t bus, device_t child)
   {
           struct qpi_device *qdev;
           int retval = 0;
   
           qdev = device_get_ivars(child);
           retval += bus_print_child_header(bus, child);
           if (qdev->qd_pcibus != -1)
                   retval += printf(" pcibus %d", qdev->qd_pcibus);
           retval += bus_print_child_footer(bus, child);
   
           return (retval);
   }
   
   static int
   qpi_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
   {
           struct qpi_device *qdev;
   
           qdev = device_get_ivars(child);
           switch (which) {
           case PCIB_IVAR_BUS:
                   *result = qdev->qd_pcibus;
                   break;
           default:
                   return (ENOENT);
           }
           return (0);
   }
   
   static device_method_t qpi_methods[] = {
           /* Device interface */
           DEVMETHOD(device_identify,      qpi_identify),
           DEVMETHOD(device_probe,         qpi_probe),
           DEVMETHOD(device_attach,        qpi_attach),
           DEVMETHOD(device_shutdown,      bus_generic_shutdown),
           DEVMETHOD(device_suspend,       bus_generic_suspend),
           DEVMETHOD(device_resume,        bus_generic_resume),
   
           /* Bus interface */
           DEVMETHOD(bus_print_child,      qpi_print_child),
           DEVMETHOD(bus_add_child,        bus_generic_add_child),
           DEVMETHOD(bus_read_ivar,        qpi_read_ivar),
           DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
           DEVMETHOD(bus_release_resource, bus_generic_release_resource),
           DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
           DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
           DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
           DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   
           { 0, 0 }
   };
   
   static devclass_t qpi_devclass;
   
   DEFINE_CLASS_0(qpi, qpi_driver, qpi_methods, 0);
   DRIVER_MODULE(qpi, nexus, qpi_driver, qpi_devclass, 0, 0);
   
   static int
   qpi_pcib_probe(device_t dev)
   {
   
           device_set_desc(dev, "QPI Host-PCI bridge");
           return (BUS_PROBE_SPECIFIC);
   }
   
   static int
   qpi_pcib_attach(device_t dev)
   {
   
           device_add_child(dev, "pci", -1);
           return (bus_generic_attach(dev));
   }
   
   static int
   qpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
   {
   
           switch (which) {
           case PCIB_IVAR_DOMAIN:
                   *result = 0;
                   return (0);
           case PCIB_IVAR_BUS:
                   *result = pcib_get_bus(dev);
                   return (0);
           default:
                   return (ENOENT);
           }
   }
   
   #if defined(NEW_PCIB) && defined(PCI_RES_BUS)
   static struct resource *
   qpi_pcib_alloc_resource(device_t dev, device_t child, int type, int *rid,
       rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
   {
   
           if (type == PCI_RES_BUS)
                   return (pci_domain_alloc_bus(0, child, rid, start, end, count,
                       flags));
           return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
               count, flags));
   }
   #endif
   
   static int
   qpi_pcib_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr,
       uint32_t *data)
   {
           device_t bus;
   
           bus = device_get_parent(pcib);
           return (PCIB_MAP_MSI(device_get_parent(bus), dev, irq, addr, data));
   }
   
   static device_method_t qpi_pcib_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         qpi_pcib_probe),
           DEVMETHOD(device_attach,        qpi_pcib_attach),
           DEVMETHOD(device_shutdown,      bus_generic_shutdown),
           DEVMETHOD(device_suspend,       bus_generic_suspend),
           DEVMETHOD(device_resume,        bus_generic_resume),
   
           /* Bus interface */
           DEVMETHOD(bus_read_ivar,        qpi_pcib_read_ivar),
   #if defined(NEW_PCIB) && defined(PCI_RES_BUS)
           DEVMETHOD(bus_alloc_resource,   qpi_pcib_alloc_resource),
           DEVMETHOD(bus_adjust_resource,  legacy_pcib_adjust_resource),
           DEVMETHOD(bus_release_resource, legacy_pcib_release_resource),
   #else
           DEVMETHOD(bus_alloc_resource,   bus_generic_alloc_resource),
           DEVMETHOD(bus_release_resource, bus_generic_release_resource),
   #endif
           DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
           DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
           DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
           DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   
           /* pcib interface */
           DEVMETHOD(pcib_maxslots,        pcib_maxslots),
           DEVMETHOD(pcib_read_config,     legacy_pcib_read_config),
           DEVMETHOD(pcib_write_config,    legacy_pcib_write_config),
           DEVMETHOD(pcib_alloc_msi,       legacy_pcib_alloc_msi),
           DEVMETHOD(pcib_release_msi,     pcib_release_msi),
           DEVMETHOD(pcib_alloc_msix,      legacy_pcib_alloc_msix),
           DEVMETHOD(pcib_release_msix,    pcib_release_msix),
           DEVMETHOD(pcib_map_msi,         qpi_pcib_map_msi),
   
           DEVMETHOD_END
   };
   
   static devclass_t qpi_pcib_devclass;
   
   DEFINE_CLASS_0(pcib, qpi_pcib_driver, qpi_pcib_methods, 0);
   DRIVER_MODULE(pcib, qpi, qpi_pcib_driver, qpi_pcib_devclass, 0, 0);

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