FreeBSD/Linux Kernel Cross Reference
sys/dev/xdma/xdma_iommu.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause
      *
      * Copyright (c) 2019 Ruslan Bukin <br@bsdpad.com>
      *
      * This software was developed by SRI International and the University of
      * Cambridge Computer Laboratory (Department of Computer Science and
      * Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
      * DARPA SSITH research programme.
     *
     * 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 "opt_platform.h"
    #include <sys/param.h>
    #include <sys/conf.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/lock.h>
    #include <sys/malloc.h>
    #include <sys/mbuf.h>
    #include <sys/mutex.h>
    #include <sys/rwlock.h>
    
    #include <machine/bus.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    #include <vm/vm_extern.h>
    #include <vm/vm_page.h>
    
    #ifdef FDT
    #include <dev/fdt/fdt_common.h>
    #include <dev/ofw/ofw_bus.h>
    #include <dev/ofw/ofw_bus_subr.h>
    #endif
    
    #include <dev/xdma/xdma.h>
    #include "xdma_if.h"
    
    void
    xdma_iommu_remove_entry(xdma_channel_t *xchan, vm_offset_t va)
    {
            struct xdma_iommu *xio;
    
            xio = &xchan->xio;
    
            va &= ~(PAGE_SIZE - 1);
            pmap_remove(&xio->p, va, va + PAGE_SIZE);
    
            XDMA_IOMMU_REMOVE(xio->dev, xio, va);
    
            vmem_free(xio->vmem, va, PAGE_SIZE);
    }
    
    static void
    xdma_iommu_enter(struct xdma_iommu *xio, vm_offset_t va,
        vm_paddr_t pa, vm_size_t size, vm_prot_t prot)
    {
            vm_page_t m;
            pmap_t p;
    
            p = &xio->p;
    
            KASSERT((size & PAGE_MASK) == 0,
                ("%s: device mapping not page-sized", __func__));
    
            for (; size > 0; size -= PAGE_SIZE) {
                    m = PHYS_TO_VM_PAGE(pa);
                    pmap_enter(p, va, m, prot, prot | PMAP_ENTER_WIRED, 0);
    
                    XDMA_IOMMU_ENTER(xio->dev, xio, va, pa);
    
                    va += PAGE_SIZE;
                    pa += PAGE_SIZE;
            }
    }
   
   void
   xdma_iommu_add_entry(xdma_channel_t *xchan, vm_offset_t *va,
       vm_paddr_t pa, vm_size_t size, vm_prot_t prot)
   {
           struct xdma_iommu *xio;
           vm_offset_t addr;
   
           size = roundup2(size, PAGE_SIZE);
           xio = &xchan->xio;
   
           if (vmem_alloc(xio->vmem, size,
               M_FIRSTFIT | M_NOWAIT, &addr)) {
                   panic("Could not allocate virtual address.\n");
           }
   
           addr |= pa & (PAGE_SIZE - 1);
   
           if (va)
                   *va = addr;
   
           xdma_iommu_enter(xio, addr, pa, size, prot);
   }
   
   int
   xdma_iommu_init(struct xdma_iommu *xio)
   {
   #ifdef FDT
           phandle_t mem_node, node;
           pcell_t mem_handle;
   #endif
   
           pmap_pinit(&xio->p);
   
   #ifdef FDT
           node = ofw_bus_get_node(xio->dev);
           if (!OF_hasprop(node, "va-region"))
                   return (ENXIO);
   
           if (OF_getencprop(node, "va-region", (void *)&mem_handle,
               sizeof(mem_handle)) <= 0)
                   return (ENXIO);
   #endif
   
           xio->vmem = vmem_create("xDMA vmem", 0, 0, PAGE_SIZE,
               PAGE_SIZE, M_FIRSTFIT | M_WAITOK);
           if (xio->vmem == NULL)
                   return (ENXIO);
   
   #ifdef FDT
           mem_node = OF_node_from_xref(mem_handle);
           if (xdma_handle_mem_node(xio->vmem, mem_node) != 0) {
                   vmem_destroy(xio->vmem);
                   return (ENXIO);
           }
   #endif
   
           XDMA_IOMMU_INIT(xio->dev, xio);
   
           return (0);
   }
   
   int
   xdma_iommu_release(struct xdma_iommu *xio)
   {
   
           pmap_release(&xio->p);
   
           vmem_destroy(xio->vmem);
   
           XDMA_IOMMU_RELEASE(xio->dev, xio);
   
           return (0);
   }

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