Add facility for registering iommus.
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jmcneill
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39a12fe15d
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f509ff8336
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/* $NetBSD: fdt_iommu.c,v 1.1 2021/09/04 12:34:39 jmcneill Exp $ */
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/*-
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* Copyright (c) 2021 Jared McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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__KERNEL_RCSID(0, "$NetBSD: fdt_iommu.c,v 1.1 2021/09/04 12:34:39 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kmem.h>
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#include <sys/queue.h>
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#include <libfdt.h>
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#include <dev/fdt/fdtvar.h>
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struct fdtbus_iommu {
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device_t iommu_dev;
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int iommu_phandle;
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const struct fdtbus_iommu_func *iommu_funcs;
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u_int iommu_cells;
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LIST_ENTRY(fdtbus_iommu) iommu_next;
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};
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static LIST_HEAD(, fdtbus_iommu) fdtbus_iommus =
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LIST_HEAD_INITIALIZER(fdtbus_iommus);
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/*
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* fdtbus_get_iommu --
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*
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* Return the iommu registered with the specified node, or NULL if
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* not found.
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*/
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static struct fdtbus_iommu *
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fdtbus_get_iommu(int phandle)
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{
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struct fdtbus_iommu *iommu;
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LIST_FOREACH(iommu, &fdtbus_iommus, iommu_next) {
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if (iommu->iommu_phandle == phandle) {
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return iommu;
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}
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}
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return NULL;
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}
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/*
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* fdtbus_register_iommu --
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*
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* Register an IOMMU on the specified node.
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*/
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int
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fdtbus_register_iommu(device_t dev, int phandle,
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const struct fdtbus_iommu_func *funcs)
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{
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struct fdtbus_iommu *iommu;
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u_int cells;
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if (funcs == NULL || funcs->map == NULL) {
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return EINVAL;
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}
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if (of_getprop_uint32(phandle, "#iommu-cells", &cells) != 0) {
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return ENXIO;
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}
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if (fdtbus_get_iommu(phandle) != NULL) {
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return EEXIST;
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}
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iommu = kmem_alloc(sizeof(*iommu), KM_SLEEP);
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iommu->iommu_dev = dev;
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iommu->iommu_phandle = phandle;
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iommu->iommu_funcs = funcs;
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iommu->iommu_cells = cells;
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LIST_INSERT_HEAD(&fdtbus_iommus, iommu, iommu_next);
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return 0;
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}
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/*
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* fdtbus_iommu_map --
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*
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* Get a bus dma tag that is translated by any iommus specified by
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* the device tree. The `index` property refers to the N-th item
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* in the list of IOMMUs specified in the "iommus" property. If an
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* IOMMU is not found, the original bus dma tag is returned.
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*/
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bus_dma_tag_t
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fdtbus_iommu_map(int phandle, u_int index, bus_dma_tag_t dmat)
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{
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struct fdtbus_iommu *iommu;
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const u_int *p;
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u_int n, cells;
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int len, resid;
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p = fdtbus_get_prop(phandle, "iommus", &len);
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if (p == NULL) {
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return dmat;
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}
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for (n = 0, resid = len; resid > 0; n++) {
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const int iommu_phandle =
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fdtbus_get_phandle_from_native(be32toh(p[0]));
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if (of_getprop_uint32(iommu_phandle, "#iommu-cells", &cells)) {
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break;
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}
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if (n == index) {
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iommu = fdtbus_get_iommu(iommu_phandle);
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if (iommu == NULL) {
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break;
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}
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return iommu->iommu_funcs->map(iommu->iommu_dev,
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cells > 0 ? &p[1] : NULL, dmat);
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}
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resid -= (cells + 1) * 4;
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p += cells + 1;
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}
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return dmat;
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}
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/*
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* fdtbus_iommu_map_pci --
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*
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* Get a bus dma tag that is translated by any iommus specified by
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* the device tree for PCI devices. The `rid` param is the requester
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* ID. Returns a (maybe translated) dma tag.
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*/
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bus_dma_tag_t
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fdtbus_iommu_map_pci(int phandle, uint32_t rid, bus_dma_tag_t dmat)
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{
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struct fdtbus_iommu *iommu;
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uint32_t map_mask;
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const u_int *p;
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u_int cells;
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int len;
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len = 0;
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p = fdtbus_get_prop(phandle, "iommu-map", &len);
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KASSERT(p != NULL || len == 0);
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if (of_getprop_uint32(phandle, "iommu-map-mask", &map_mask) == 0) {
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rid &= map_mask;
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}
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while (len >= 4) {
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const u_int rid_base = be32toh(*p++);
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const int iommu_phandle =
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fdtbus_get_phandle_from_native(be32toh(*p++));
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const u_int iommu_base = be32toh(*p++);
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const u_int length = be32toh(*p++);
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len -= 4;
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if (iommu_phandle <= 0) {
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continue;
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}
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if (of_getprop_uint32(iommu_phandle, "#iommu-cells", &cells)) {
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continue;
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}
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if (cells != 1) {
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/*
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* The pci-iommu bindings expect iommu references with
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* exactly one specifier cell.
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*/
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continue;
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}
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iommu = fdtbus_get_iommu(iommu_phandle);
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if (iommu == NULL) {
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continue;
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}
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if (rid >= rid_base && rid < rid_base + length) {
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const uint32_t sid = rid - rid_base + iommu_base;
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return iommu->iommu_funcs->map(iommu->iommu_dev,
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&sid, dmat);
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}
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}
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return dmat;
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}
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@ -1,4 +1,4 @@
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/* $NetBSD: fdtvar.h,v 1.70 2021/04/24 23:36:53 thorpej Exp $ */
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/* $NetBSD: fdtvar.h,v 1.71 2021/09/04 12:34:39 jmcneill Exp $ */
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/*-
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* Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
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@ -108,6 +108,10 @@ struct fdtbus_pinctrl_controller_func {
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int (*set_config)(device_t, const void *, size_t);
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};
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struct fdtbus_iommu_func {
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bus_dma_tag_t (*map)(device_t, const u_int *, bus_dma_tag_t);
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};
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struct fdtbus_regulator_controller;
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struct fdtbus_regulator {
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@ -299,6 +303,8 @@ int fdtbus_register_pwm_controller(device_t, int,
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int fdtbus_register_mmc_pwrseq(device_t, int,
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const struct fdtbus_mmc_pwrseq_func *);
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int fdtbus_register_syscon(device_t, int, struct syscon *);
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int fdtbus_register_iommu(device_t, int,
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const struct fdtbus_iommu_func *);
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void fdtbus_set_decoderegprop(bool);
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@ -363,6 +369,8 @@ int fdtbus_regulator_supports_voltage(struct fdtbus_regulator *,
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u_int, u_int);
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struct syscon * fdtbus_syscon_acquire(int, const char *);
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struct syscon * fdtbus_syscon_lookup(int);
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bus_dma_tag_t fdtbus_iommu_map(int, u_int, bus_dma_tag_t);
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bus_dma_tag_t fdtbus_iommu_map_pci(int, uint32_t, bus_dma_tag_t);
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struct fdtbus_dma *fdtbus_dma_get(int, const char *, void (*)(void *), void *);
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struct fdtbus_dma *fdtbus_dma_get_index(int, u_int, void (*)(void *),
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@ -1,4 +1,4 @@
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# $NetBSD: files.fdt,v 1.61 2021/04/26 15:02:29 thorpej Exp $
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# $NetBSD: files.fdt,v 1.62 2021/09/04 12:34:39 jmcneill Exp $
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include "external/bsd/libfdt/conf/files.libfdt"
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@ -72,6 +72,7 @@ file dev/fdt/fdt_dma.c fdt
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file dev/fdt/fdt_ddb.c fdt & ddb
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file dev/fdt/fdt_gpio.c fdt
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file dev/fdt/fdt_i2c.c fdt
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file dev/fdt/fdt_iommu.c fdt
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file dev/fdt/fdt_intr.c fdt
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file dev/fdt/fdt_mmc_pwrseq.c fdt
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file dev/fdt/fdt_phy.c fdt
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