freebsd-dev/sys/dev/xdma/xdma_iommu.c
Ruslan Bukin e8e90fef03 Remove unused header.
Sponsored by:	DARPA, AFRL
2019-07-22 16:50:37 +00:00

174 lines
4.2 KiB
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);
}