FreeBSD/Linux Kernel Cross Reference
sys/powerpc/pseries/vdevice.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2011 Nathan Whitehorn
      * 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/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/malloc.h>
    #include <sys/bus.h>
    #include <sys/cpu.h>
    #include <machine/bus.h>
    #include <machine/intr_machdep.h>
    
    #include <dev/ofw/openfirm.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    
    #include <powerpc/pseries/plpar_iommu.h>
    
    #include "iommu_if.h"
    
    static int      vdevice_probe(device_t);
    static int      vdevice_attach(device_t);
    static const struct ofw_bus_devinfo *vdevice_get_devinfo(device_t dev,
        device_t child);
    static int      vdevice_print_child(device_t dev, device_t child);
    static struct resource_list *vdevice_get_resource_list(device_t, device_t);
    static bus_dma_tag_t vdevice_get_dma_tag(device_t dev, device_t child);
    
    /*
     * VDevice devinfo
     */
    struct vdevice_devinfo {
            struct ofw_bus_devinfo mdi_obdinfo;
            struct resource_list mdi_resources;
            bus_dma_tag_t mdi_dma_tag;
    };
    
    static device_method_t vdevice_methods[] = {
            /* Device interface */
            DEVMETHOD(device_probe,         vdevice_probe),
            DEVMETHOD(device_attach,        vdevice_attach),
    
            /* Bus interface */
            DEVMETHOD(bus_add_child,        bus_generic_add_child),
            DEVMETHOD(bus_child_pnpinfo,    ofw_bus_gen_child_pnpinfo),
            DEVMETHOD(bus_print_child,      vdevice_print_child),
            DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
            DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
            DEVMETHOD(bus_alloc_resource,   bus_generic_rl_alloc_resource),
            DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
            DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
            DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
            DEVMETHOD(bus_get_resource_list, vdevice_get_resource_list),
    
            /* ofw_bus interface */
            DEVMETHOD(ofw_bus_get_devinfo,  vdevice_get_devinfo),
            DEVMETHOD(ofw_bus_get_compat,   ofw_bus_gen_get_compat),
            DEVMETHOD(ofw_bus_get_model,    ofw_bus_gen_get_model),
            DEVMETHOD(ofw_bus_get_name,     ofw_bus_gen_get_name),
            DEVMETHOD(ofw_bus_get_node,     ofw_bus_gen_get_node),
            DEVMETHOD(ofw_bus_get_type,     ofw_bus_gen_get_type),
    
            /* IOMMU interface */
            DEVMETHOD(bus_get_dma_tag,      vdevice_get_dma_tag),
            DEVMETHOD(iommu_map,            phyp_iommu_map),
            DEVMETHOD(iommu_unmap,          phyp_iommu_unmap),
    
            DEVMETHOD_END
    };
    
   static driver_t vdevice_driver = {
           "vdevice",
           vdevice_methods,
           0
   };
   
   DRIVER_MODULE(vdevice, ofwbus, vdevice_driver, 0, 0);
   
   static int 
   vdevice_probe(device_t dev) 
   {
           const char      *name;
   
           name = ofw_bus_get_name(dev);
   
           if (name == NULL || strcmp(name, "vdevice") != 0)
                   return (ENXIO);
   
           if (!ofw_bus_is_compatible(dev, "IBM,vdevice"))
                   return (ENXIO);
   
           device_set_desc(dev, "POWER Hypervisor Virtual Device Root");
   
           return (0);
   }
   
   static int 
   vdevice_attach(device_t dev) 
   {
           phandle_t root, child;
           device_t cdev;
           struct vdevice_devinfo *dinfo;
   
           root = ofw_bus_get_node(dev);
   
           /* The XICP (root PIC) will handle all our interrupts */
           powerpc_register_pic(root_pic, OF_xref_from_node(root),
               1 << 24 /* 24-bit XIRR field */, 1 /* Number of IPIs */, FALSE);
   
           for (child = OF_child(root); child != 0; child = OF_peer(child)) {
                   dinfo = malloc(sizeof(*dinfo), M_DEVBUF, M_WAITOK | M_ZERO);
   
                   if (ofw_bus_gen_setup_devinfo(&dinfo->mdi_obdinfo,
                       child) != 0) {
                           free(dinfo, M_DEVBUF);
                           continue;
                   }
                   resource_list_init(&dinfo->mdi_resources);
   
                   ofw_bus_intr_to_rl(dev, child, &dinfo->mdi_resources, NULL);
   
                   cdev = device_add_child(dev, NULL, -1);
                   if (cdev == NULL) {
                           device_printf(dev, "<%s>: device_add_child failed\n",
                               dinfo->mdi_obdinfo.obd_name);
                           ofw_bus_gen_destroy_devinfo(&dinfo->mdi_obdinfo);
                           free(dinfo, M_DEVBUF);
                           continue;
                   }
                   device_set_ivars(cdev, dinfo);
           }
   
           return (bus_generic_attach(dev));
   }
   
   static const struct ofw_bus_devinfo *
   vdevice_get_devinfo(device_t dev, device_t child) 
   {
           return (device_get_ivars(child));       
   }
   
   static int
   vdevice_print_child(device_t dev, device_t child)
   {
           struct vdevice_devinfo *dinfo;
           struct resource_list *rl;
           int retval = 0;
   
           dinfo = device_get_ivars(child);
           rl = &dinfo->mdi_resources;
   
           retval += bus_print_child_header(dev, child);
   
           retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%jd");
   
           retval += bus_print_child_footer(dev, child);
   
           return (retval);
   }
   
   static struct resource_list *
   vdevice_get_resource_list (device_t dev, device_t child)
   {
           struct vdevice_devinfo *dinfo;
   
           dinfo = device_get_ivars(child);
           return (&dinfo->mdi_resources);
   }
   
   static bus_dma_tag_t
   vdevice_get_dma_tag(device_t dev, device_t child)
   {
           struct vdevice_devinfo *dinfo;
           while (child != NULL && device_get_parent(child) != dev)
                   child = device_get_parent(child);
           dinfo = device_get_ivars(child);
   
           if (dinfo->mdi_dma_tag == NULL) {
                   bus_dma_tag_create(bus_get_dma_tag(dev),
                       1, 0, BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
                       NULL, NULL, BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED,
                       BUS_SPACE_MAXSIZE, 0, NULL, NULL, &dinfo->mdi_dma_tag);
                   phyp_iommu_set_dma_tag(dev, child, dinfo->mdi_dma_tag);
           }
   
           return (dinfo->mdi_dma_tag);
   }

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