2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2013, Nathan Whitehorn <nwhitehorn@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/libkern.h>
36 #include <sys/module.h>
39 #include <dev/ofw/ofw_bus.h>
40 #include <dev/ofw/ofw_bus_subr.h>
41 #include <dev/ofw/openfirm.h>
43 #include <machine/bus.h>
45 #include <powerpc/pseries/phyp-hvcall.h>
46 #include <powerpc/pseries/plpar_iommu.h>
48 MALLOC_DEFINE(M_PHYPIOMMU, "iommu", "IOMMU data for PAPR LPARs");
50 struct papr_iommu_map {
53 struct papr_iommu_map *next;
56 static SLIST_HEAD(iommu_maps, iommu_map) iommu_map_head =
57 SLIST_HEAD_INITIALIZER(iommu_map_head);
58 static int papr_supports_stuff_tce = -1;
64 SLIST_ENTRY(iommu_map) entries;
68 struct iommu_map *map;
74 phyp_iommu_set_dma_tag(device_t bus, device_t dev, bus_dma_tag_t tag)
78 cell_t dma_acells, dma_scells, dmawindow[6];
82 for (p = dev; device_get_parent(p) != NULL; p = device_get_parent(p)) {
83 if (ofw_bus_has_prop(p, "ibm,my-dma-window"))
85 if (ofw_bus_has_prop(p, "ibm,dma-window"))
92 node = ofw_bus_get_node(p);
93 if (OF_getencprop(node, "ibm,#dma-size-cells", &dma_scells,
95 OF_searchencprop(node, "#size-cells", &dma_scells,
97 if (OF_getencprop(node, "ibm,#dma-address-cells", &dma_acells,
99 OF_searchencprop(node, "#address-cells", &dma_acells,
102 if (ofw_bus_has_prop(p, "ibm,my-dma-window"))
103 OF_getencprop(node, "ibm,my-dma-window", dmawindow,
104 sizeof(cell_t)*(dma_scells + dma_acells + 1));
106 OF_getencprop(node, "ibm,dma-window", dmawindow,
107 sizeof(cell_t)*(dma_scells + dma_acells + 1));
109 struct dma_window *window = malloc(sizeof(struct dma_window),
110 M_PHYPIOMMU, M_WAITOK);
112 for (cell = 1; cell < 1 + dma_acells; cell++) {
113 window->start <<= 32;
114 window->start |= dmawindow[cell];
117 for (; cell < 1 + dma_acells + dma_scells; cell++) {
119 window->end |= dmawindow[cell];
121 window->end += window->start;
124 device_printf(dev, "Mapping IOMMU domain %#x\n", dmawindow[0]);
126 SLIST_FOREACH(i, &iommu_map_head, entries) {
127 if (i->iobn == dmawindow[0]) {
133 if (window->map == NULL) {
134 window->map = malloc(sizeof(struct iommu_map), M_PHYPIOMMU,
136 window->map->iobn = dmawindow[0];
138 * Allocate IOMMU range beginning at PAGE_SIZE. Some drivers
139 * (em(4), for example) do not like getting mappings at 0.
141 window->map->vmem = vmem_create("IOMMU mappings", PAGE_SIZE,
142 trunc_page(VMEM_ADDR_MAX) - PAGE_SIZE, PAGE_SIZE, 0,
143 M_BESTFIT | M_NOWAIT);
144 SLIST_INSERT_HEAD(&iommu_map_head, window->map, entries);
148 * Check experimentally whether we can use H_STUFF_TCE. It is required
149 * by the spec but some firmware (e.g. QEMU) does not actually support
152 if (papr_supports_stuff_tce == -1)
153 papr_supports_stuff_tce = !(phyp_hcall(H_STUFF_TCE,
154 window->map->iobn, 0, 0, 0) == H_FUNCTION);
156 bus_dma_tag_set_iommu(tag, bus, window);
162 phyp_iommu_map(device_t dev, bus_dma_segment_t *segs, int *nsegs,
163 bus_addr_t min, bus_addr_t max, bus_size_t alignment, bus_addr_t boundary,
166 struct dma_window *window = cookie;
167 bus_addr_t minaddr, maxaddr;
169 bus_size_t allocsize;
172 minaddr = window->start;
173 maxaddr = window->end;
175 /* XXX: handle exclusion range in a more useful way */
179 /* XXX: consolidate segs? */
180 for (i = 0; i < *nsegs; i++) {
181 allocsize = round_page(segs[i].ds_len +
182 (segs[i].ds_addr & PAGE_MASK));
183 error = vmem_xalloc(window->map->vmem, allocsize,
184 (alignment < PAGE_SIZE) ? PAGE_SIZE : alignment, 0,
185 boundary, minaddr, maxaddr, M_BESTFIT | M_NOWAIT, &alloced);
187 panic("VMEM failure: %d\n", error);
190 KASSERT(alloced % PAGE_SIZE == 0, ("Alloc not page aligned"));
191 KASSERT((alloced + (segs[i].ds_addr & PAGE_MASK)) %
193 ("Allocated segment does not match alignment constraint"));
195 tce = trunc_page(segs[i].ds_addr);
196 tce |= 0x3; /* read/write */
197 for (j = 0; j < allocsize; j += PAGE_SIZE) {
198 error = phyp_hcall(H_PUT_TCE, window->map->iobn,
199 alloced + j, tce + j);
201 panic("IOMMU mapping error: %d\n", error);
206 segs[i].ds_addr = alloced + (segs[i].ds_addr & PAGE_MASK);
207 KASSERT(segs[i].ds_addr > 0, ("Address needs to be positive"));
208 KASSERT(segs[i].ds_addr + segs[i].ds_len < maxaddr,
209 ("Address not in range"));
211 panic("IOMMU mapping error: %d\n", error);
220 phyp_iommu_unmap(device_t dev, bus_dma_segment_t *segs, int nsegs, void *cookie)
222 struct dma_window *window = cookie;
223 bus_addr_t pageround;
224 bus_size_t roundedsize;
228 for (i = 0; i < nsegs; i++) {
229 pageround = trunc_page(segs[i].ds_addr);
230 roundedsize = round_page(segs[i].ds_len +
231 (segs[i].ds_addr & PAGE_MASK));
233 if (papr_supports_stuff_tce) {
234 phyp_hcall(H_STUFF_TCE, window->map->iobn, pageround, 0,
235 roundedsize/PAGE_SIZE);
237 for (j = 0; j < roundedsize; j += PAGE_SIZE)
238 phyp_hcall(H_PUT_TCE, window->map->iobn,
242 vmem_xfree(window->map->vmem, pageround, roundedsize);