172 lines
4.1 KiB
C
172 lines
4.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2019 Ruslan Bukin <br@bsdpad.com>
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory (Department of Computer Science and
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* Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the
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* DARPA SSITH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/rwlock.h>
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#include <machine/bus.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_page.h>
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#ifdef FDT
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#endif
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#include <dev/xdma/xdma.h>
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#include "xdma_if.h"
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void
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xdma_iommu_remove_entry(xdma_channel_t *xchan, vm_offset_t va)
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{
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struct xdma_iommu *xio;
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xio = &xchan->xio;
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va &= ~(PAGE_SIZE - 1);
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pmap_remove(&xio->p, va, va + PAGE_SIZE);
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XDMA_IOMMU_REMOVE(xio->dev, xio, va);
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vmem_free(xio->vmem, va, PAGE_SIZE);
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}
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static void
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xdma_iommu_enter(struct xdma_iommu *xio, vm_offset_t va,
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vm_paddr_t pa, vm_size_t size, vm_prot_t prot)
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{
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vm_page_t m;
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pmap_t p;
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p = &xio->p;
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KASSERT((size & PAGE_MASK) == 0,
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("%s: device mapping not page-sized", __func__));
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for (; size > 0; size -= PAGE_SIZE) {
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m = PHYS_TO_VM_PAGE(pa);
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pmap_enter(p, va, m, prot, prot | PMAP_ENTER_WIRED, 0);
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XDMA_IOMMU_ENTER(xio->dev, xio, va, pa);
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va += PAGE_SIZE;
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pa += PAGE_SIZE;
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}
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}
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void
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xdma_iommu_add_entry(xdma_channel_t *xchan, vm_offset_t *va,
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vm_paddr_t pa, vm_size_t size, vm_prot_t prot)
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{
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struct xdma_iommu *xio;
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vm_offset_t addr;
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size = roundup2(size, PAGE_SIZE);
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xio = &xchan->xio;
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if (vmem_alloc(xio->vmem, size,
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M_FIRSTFIT | M_NOWAIT, &addr)) {
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panic("Could not allocate virtual address.\n");
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}
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addr |= pa & (PAGE_SIZE - 1);
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if (va)
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*va = addr;
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xdma_iommu_enter(xio, addr, pa, size, prot);
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}
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int
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xdma_iommu_init(struct xdma_iommu *xio)
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{
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#ifdef FDT
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phandle_t mem_node, node;
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pcell_t mem_handle;
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#endif
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pmap_pinit(&xio->p);
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#ifdef FDT
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node = ofw_bus_get_node(xio->dev);
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if (!OF_hasprop(node, "va-region"))
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return (ENXIO);
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if (OF_getencprop(node, "va-region", (void *)&mem_handle,
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sizeof(mem_handle)) <= 0)
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return (ENXIO);
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#endif
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xio->vmem = vmem_create("xDMA vmem", 0, 0, PAGE_SIZE,
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PAGE_SIZE, M_FIRSTFIT | M_WAITOK);
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if (xio->vmem == NULL)
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return (ENXIO);
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#ifdef FDT
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mem_node = OF_node_from_xref(mem_handle);
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if (xdma_handle_mem_node(xio->vmem, mem_node) != 0) {
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vmem_destroy(xio->vmem);
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return (ENXIO);
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}
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#endif
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XDMA_IOMMU_INIT(xio->dev, xio);
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return (0);
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}
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int
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xdma_iommu_release(struct xdma_iommu *xio)
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{
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pmap_release(&xio->p);
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vmem_destroy(xio->vmem);
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XDMA_IOMMU_RELEASE(xio->dev, xio);
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return (0);
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}
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