1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2013, Nathan Whitehorn <nwhitehorn@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 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. 16 * 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. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kernel.h> 35 #include <sys/libkern.h> 36 #include <sys/module.h> 37 #include <sys/vmem.h> 38 39 #include <dev/ofw/ofw_bus.h> 40 #include <dev/ofw/ofw_bus_subr.h> 41 #include <dev/ofw/openfirm.h> 42 43 #include <machine/bus.h> 44 45 #include <powerpc/pseries/phyp-hvcall.h> 46 #include <powerpc/pseries/plpar_iommu.h> 47 48 MALLOC_DEFINE(M_PHYPIOMMU, "iommu", "IOMMU data for PAPR LPARs"); 49 50 struct papr_iommu_map { 51 uint32_t iobn; 52 vmem_t *vmem; 53 struct papr_iommu_map *next; 54 }; 55 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; 59 60 struct iommu_map { 61 uint32_t iobn; 62 vmem_t *vmem; 63 64 SLIST_ENTRY(iommu_map) entries; 65 }; 66 67 struct dma_window { 68 struct iommu_map *map; 69 bus_addr_t start; 70 bus_addr_t end; 71 }; 72 73 int 74 phyp_iommu_set_dma_tag(device_t bus, device_t dev, bus_dma_tag_t tag) 75 { 76 device_t p; 77 phandle_t node; 78 cell_t dma_acells, dma_scells, dmawindow[6]; 79 struct iommu_map *i; 80 int cell; 81 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")) 84 break; 85 if (ofw_bus_has_prop(p, "ibm,dma-window")) 86 break; 87 } 88 89 if (p == NULL) 90 return (ENXIO); 91 92 node = ofw_bus_get_node(p); 93 if (OF_getencprop(node, "ibm,#dma-size-cells", &dma_scells, 94 sizeof(cell_t)) <= 0) 95 OF_searchencprop(node, "#size-cells", &dma_scells, 96 sizeof(cell_t)); 97 if (OF_getencprop(node, "ibm,#dma-address-cells", &dma_acells, 98 sizeof(cell_t)) <= 0) 99 OF_searchencprop(node, "#address-cells", &dma_acells, 100 sizeof(cell_t)); 101 102 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)); 105 else 106 OF_getencprop(node, "ibm,dma-window", dmawindow, 107 sizeof(cell_t)*(dma_scells + dma_acells + 1)); 108 109 struct dma_window *window = malloc(sizeof(struct dma_window), 110 M_PHYPIOMMU, M_WAITOK); 111 window->start = 0; 112 for (cell = 1; cell < 1 + dma_acells; cell++) { 113 window->start <<= 32; 114 window->start |= dmawindow[cell]; 115 } 116 window->end = 0; 117 for (; cell < 1 + dma_acells + dma_scells; cell++) { 118 window->end <<= 32; 119 window->end |= dmawindow[cell]; 120 } 121 window->end += window->start; 122 123 if (bootverbose) 124 device_printf(dev, "Mapping IOMMU domain %#x\n", dmawindow[0]); 125 window->map = NULL; 126 SLIST_FOREACH(i, &iommu_map_head, entries) { 127 if (i->iobn == dmawindow[0]) { 128 window->map = i; 129 break; 130 } 131 } 132 133 if (window->map == NULL) { 134 window->map = malloc(sizeof(struct iommu_map), M_PHYPIOMMU, 135 M_WAITOK); 136 window->map->iobn = dmawindow[0]; 137 /* 138 * Allocate IOMMU range beginning at PAGE_SIZE. Some drivers 139 * (em(4), for example) do not like getting mappings at 0. 140 */ 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); 145 } 146 147 /* 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 150 * it 151 */ 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); 155 156 bus_dma_tag_set_iommu(tag, bus, window); 157 158 return (0); 159 } 160 161 int 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, 164 void *cookie) 165 { 166 struct dma_window *window = cookie; 167 bus_addr_t minaddr, maxaddr; 168 bus_addr_t alloced; 169 bus_size_t allocsize; 170 int error, i, j; 171 uint64_t tce; 172 minaddr = window->start; 173 maxaddr = window->end; 174 175 /* XXX: handle exclusion range in a more useful way */ 176 if (min < maxaddr) 177 maxaddr = min; 178 179 /* 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); 186 if (error != 0) { 187 panic("VMEM failure: %d\n", error); 188 return (error); 189 } 190 KASSERT(alloced % PAGE_SIZE == 0, ("Alloc not page aligned")); 191 KASSERT((alloced + (segs[i].ds_addr & PAGE_MASK)) % 192 alignment == 0, 193 ("Allocated segment does not match alignment constraint")); 194 195 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); 200 if (error < 0) { 201 panic("IOMMU mapping error: %d\n", error); 202 return (ENOMEM); 203 } 204 } 205 206 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")); 210 if (error < 0) { 211 panic("IOMMU mapping error: %d\n", error); 212 return (ENOMEM); 213 } 214 } 215 216 return (0); 217 } 218 219 int 220 phyp_iommu_unmap(device_t dev, bus_dma_segment_t *segs, int nsegs, void *cookie) 221 { 222 struct dma_window *window = cookie; 223 bus_addr_t pageround; 224 bus_size_t roundedsize; 225 int i; 226 bus_addr_t j; 227 228 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)); 232 233 if (papr_supports_stuff_tce) { 234 phyp_hcall(H_STUFF_TCE, window->map->iobn, pageround, 0, 235 roundedsize/PAGE_SIZE); 236 } else { 237 for (j = 0; j < roundedsize; j += PAGE_SIZE) 238 phyp_hcall(H_PUT_TCE, window->map->iobn, 239 pageround + j, 0); 240 } 241 242 vmem_xfree(window->map->vmem, pageround, roundedsize); 243 } 244 245 return (0); 246 } 247