FreeBSD/Linux Kernel Cross Reference
sys/dev/xen/xenpci/xenpci.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2008 Citrix Systems, Inc.
      * 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.
     */
    
    #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 <machine/bus.h>
    #include <machine/resource.h>
    #include <sys/rman.h>
    
    #include <machine/stdarg.h>
    
    #include <xen/xen-os.h>
    #include <xen/features.h>
    #include <xen/hypervisor.h>
    #include <xen/hvm.h>
    #include <xen/xen_intr.h>
    
    #include <dev/pci/pcireg.h>
    #include <dev/pci/pcivar.h>
    
    #include <dev/xen/xenpci/xenpcivar.h>
    
    static int
    xenpci_intr_filter(void *trap_frame)
    {
            xen_intr_handle_upcall(trap_frame);
            return (FILTER_HANDLED);
    }
    
    static int
    xenpci_irq_init(device_t device, struct xenpci_softc *scp)
    {
            int error;
    
            error = BUS_SETUP_INTR(device_get_parent(device), device,
                                   scp->res_irq, INTR_MPSAFE|INTR_TYPE_MISC,
                                   xenpci_intr_filter, NULL, /*trap_frame*/NULL,
                                   &scp->intr_cookie);
            if (error)
                    return error;
    
    #ifdef SMP
            /*
             * When using the PCI event delivery callback we cannot assign
             * events to specific vCPUs, so all events are delivered to vCPU#0 by
             * Xen. Since the PCI interrupt can fire on any CPU by default, we
             * need to bind it to vCPU#0 in order to ensure that
             * xen_intr_handle_upcall always gets called on vCPU#0.
             */
            error = BUS_BIND_INTR(device_get_parent(device), device,
                                  scp->res_irq, 0);
            if (error)
                    return error;
    #endif
    
            xen_hvm_set_callback(device);
            return (0);
    }
    
    /*
     * Deallocate anything allocated by xenpci_allocate_resources.
     */
    static int
    xenpci_deallocate_resources(device_t dev)
    {
            struct xenpci_softc *scp = device_get_softc(dev);
    
           if (scp->res_irq != 0) {
                   bus_deactivate_resource(dev, SYS_RES_IRQ,
                           scp->rid_irq, scp->res_irq);
                   bus_release_resource(dev, SYS_RES_IRQ,
                           scp->rid_irq, scp->res_irq);
                   scp->res_irq = 0;
           }
   
           return (0);
   }
   
   /*
    * Allocate irq and memory resources.
    */
   static int
   xenpci_allocate_resources(device_t dev)
   {
           struct xenpci_softc *scp = device_get_softc(dev);
   
           scp->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
                           &scp->rid_irq, RF_SHAREABLE|RF_ACTIVE);
           if (scp->res_irq == NULL) {
                   printf("xenpci Could not allocate irq.\n");
                   goto errexit;
           }
   
           return (0);
   
   errexit:
           /* Cleanup anything we may have assigned. */
           xenpci_deallocate_resources(dev);
           return (ENXIO); /* For want of a better idea. */
   }
   
   /*
    * Probe - just check device ID.
    */
   static int
   xenpci_probe(device_t dev)
   {
   
           if (pci_get_devid(dev) != 0x00015853)
                   return (ENXIO);
   
           device_set_desc(dev, "Xen Platform Device");
           return (BUS_PROBE_DEFAULT);
   }
   
   /*
    * Attach - find resources and talk to Xen.
    */
   static int
   xenpci_attach(device_t dev)
   {
           struct xenpci_softc *scp = device_get_softc(dev);
           int error;
   
           error = xenpci_allocate_resources(dev);
           if (error) {
                   device_printf(dev, "xenpci_allocate_resources failed(%d).\n",
                       error);
                   goto errexit;
           }
   
           /*
            * Hook the irq up to evtchn
            */
           error = xenpci_irq_init(dev, scp);
           if (error) {
                   device_printf(dev, "xenpci_irq_init failed(%d).\n",
                           error);
                   goto errexit;
           }
   
           return (0);
   
   errexit:
           /*
            * Undo anything we may have done.
            */
           xenpci_deallocate_resources(dev);
           return (error);
   }
   
   /*
    * Detach - reverse anything done by attach.
    */
   static int
   xenpci_detach(device_t dev)
   {
           struct xenpci_softc *scp = device_get_softc(dev);
           device_t parent = device_get_parent(dev);
   
           /*
            * Take our interrupt handler out of the list of handlers
            * that can handle this irq.
            */
           if (scp->intr_cookie != NULL) {
                   if (BUS_TEARDOWN_INTR(parent, dev,
                       scp->res_irq, scp->intr_cookie) != 0)
                           device_printf(dev,
                               "intr teardown failed.. continuing\n");
                   scp->intr_cookie = NULL;
           }
   
           /*
            * Deallocate any system resources we may have
            * allocated on behalf of this driver.
            */
           return (xenpci_deallocate_resources(dev));
   }
   
   static int
   xenpci_resume(device_t dev)
   {
           xen_hvm_set_callback(dev);
           return (0);
   }
   
   static device_method_t xenpci_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         xenpci_probe),
           DEVMETHOD(device_attach,        xenpci_attach),
           DEVMETHOD(device_detach,        xenpci_detach),
           DEVMETHOD(device_resume,        xenpci_resume),
           { 0, 0 }
   };
   
   static driver_t xenpci_driver = {
           "xenpci",
           xenpci_methods,
           sizeof(struct xenpci_softc),
   };
   
   DRIVER_MODULE(xenpci, pci, xenpci_driver, 0, 0);

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