1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/libkern.h> 33 #include <sys/module.h> 34 #include <sys/vmem.h> 35 36 #include <dev/ofw/ofw_bus.h> 37 #include <dev/ofw/ofw_bus_subr.h> 38 #include <dev/ofw/openfirm.h> 39 40 #include <machine/bus.h> 41 42 #include <powerpc/pseries/phyp-hvcall.h> 43 #include <powerpc/pseries/plpar_iommu.h> 44 45 MALLOC_DEFINE(M_PHYPIOMMU, "iommu", "IOMMU data for PAPR LPARs"); 46 47 struct papr_iommu_map { 48 uint32_t iobn; 49 vmem_t *vmem; 50 struct papr_iommu_map *next; 51 }; 52 53 static SLIST_HEAD(iommu_maps, iommu_map) iommu_map_head = 54 SLIST_HEAD_INITIALIZER(iommu_map_head); 55 static int papr_supports_stuff_tce = -1; 56 57 struct iommu_map { 58 uint32_t iobn; 59 vmem_t *vmem; 60 61 SLIST_ENTRY(iommu_map) entries; 62 }; 63 64 struct dma_window { 65 struct iommu_map *map; 66 bus_addr_t start; 67 bus_addr_t end; 68 }; 69 70 int 71 phyp_iommu_set_dma_tag(device_t bus, device_t dev, bus_dma_tag_t tag) 72 { 73 device_t p; 74 phandle_t node; 75 cell_t dma_acells, dma_scells, dmawindow[6]; 76 struct iommu_map *i; 77 int cell; 78 79 for (p = dev; device_get_parent(p) != NULL; p = device_get_parent(p)) { 80 if (ofw_bus_has_prop(p, "ibm,my-dma-window")) 81 break; 82 if (ofw_bus_has_prop(p, "ibm,dma-window")) 83 break; 84 } 85 86 if (p == NULL) 87 return (ENXIO); 88 89 node = ofw_bus_get_node(p); 90 if (OF_getencprop(node, "ibm,#dma-size-cells", &dma_scells, 91 sizeof(cell_t)) <= 0) 92 OF_searchencprop(node, "#size-cells", &dma_scells, 93 sizeof(cell_t)); 94 if (OF_getencprop(node, "ibm,#dma-address-cells", &dma_acells, 95 sizeof(cell_t)) <= 0) 96 OF_searchencprop(node, "#address-cells", &dma_acells, 97 sizeof(cell_t)); 98 99 if (ofw_bus_has_prop(p, "ibm,my-dma-window")) 100 OF_getencprop(node, "ibm,my-dma-window", dmawindow, 101 sizeof(cell_t)*(dma_scells + dma_acells + 1)); 102 else 103 OF_getencprop(node, "ibm,dma-window", dmawindow, 104 sizeof(cell_t)*(dma_scells + dma_acells + 1)); 105 106 struct dma_window *window = malloc(sizeof(struct dma_window), 107 M_PHYPIOMMU, M_WAITOK); 108 window->start = 0; 109 for (cell = 1; cell < 1 + dma_acells; cell++) { 110 window->start <<= 32; 111 window->start |= dmawindow[cell]; 112 } 113 window->end = 0; 114 for (; cell < 1 + dma_acells + dma_scells; cell++) { 115 window->end <<= 32; 116 window->end |= dmawindow[cell]; 117 } 118 window->end += window->start; 119 120 if (bootverbose) 121 device_printf(dev, "Mapping IOMMU domain %#x\n", dmawindow[0]); 122 window->map = NULL; 123 SLIST_FOREACH(i, &iommu_map_head, entries) { 124 if (i->iobn == dmawindow[0]) { 125 window->map = i; 126 break; 127 } 128 } 129 130 if (window->map == NULL) { 131 window->map = malloc(sizeof(struct iommu_map), M_PHYPIOMMU, 132 M_WAITOK); 133 window->map->iobn = dmawindow[0]; 134 /* 135 * Allocate IOMMU range beginning at PAGE_SIZE. Some drivers 136 * (em(4), for example) do not like getting mappings at 0. 137 */ 138 window->map->vmem = vmem_create("IOMMU mappings", PAGE_SIZE, 139 trunc_page(VMEM_ADDR_MAX) - PAGE_SIZE, PAGE_SIZE, 0, 140 M_BESTFIT | M_NOWAIT); 141 SLIST_INSERT_HEAD(&iommu_map_head, window->map, entries); 142 } 143 144 /* 145 * Check experimentally whether we can use H_STUFF_TCE. It is required 146 * by the spec but some firmware (e.g. QEMU) does not actually support 147 * it 148 */ 149 if (papr_supports_stuff_tce == -1) 150 papr_supports_stuff_tce = !(phyp_hcall(H_STUFF_TCE, 151 window->map->iobn, 0, 0, 0) == H_FUNCTION); 152 153 bus_dma_tag_set_iommu(tag, bus, window); 154 155 return (0); 156 } 157 158 int 159 phyp_iommu_map(device_t dev, bus_dma_segment_t *segs, int *nsegs, 160 bus_addr_t min, bus_addr_t max, bus_size_t alignment, bus_addr_t boundary, 161 void *cookie) 162 { 163 struct dma_window *window = cookie; 164 bus_addr_t minaddr, maxaddr; 165 bus_addr_t alloced; 166 bus_size_t allocsize; 167 int error, i, j; 168 uint64_t tce; 169 minaddr = window->start; 170 maxaddr = window->end; 171 172 /* XXX: handle exclusion range in a more useful way */ 173 if (min < maxaddr) 174 maxaddr = min; 175 176 /* XXX: consolidate segs? */ 177 for (i = 0; i < *nsegs; i++) { 178 allocsize = round_page(segs[i].ds_len + 179 (segs[i].ds_addr & PAGE_MASK)); 180 error = vmem_xalloc(window->map->vmem, allocsize, 181 (alignment < PAGE_SIZE) ? PAGE_SIZE : alignment, 0, 182 boundary, minaddr, maxaddr, M_BESTFIT | M_NOWAIT, &alloced); 183 if (error != 0) { 184 panic("VMEM failure: %d\n", error); 185 return (error); 186 } 187 KASSERT(alloced % PAGE_SIZE == 0, ("Alloc not page aligned")); 188 KASSERT((alloced + (segs[i].ds_addr & PAGE_MASK)) % 189 alignment == 0, 190 ("Allocated segment does not match alignment constraint")); 191 192 tce = trunc_page(segs[i].ds_addr); 193 tce |= 0x3; /* read/write */ 194 for (j = 0; j < allocsize; j += PAGE_SIZE) { 195 error = phyp_hcall(H_PUT_TCE, window->map->iobn, 196 alloced + j, tce + j); 197 if (error < 0) { 198 panic("IOMMU mapping error: %d\n", error); 199 return (ENOMEM); 200 } 201 } 202 203 segs[i].ds_addr = alloced + (segs[i].ds_addr & PAGE_MASK); 204 KASSERT(segs[i].ds_addr > 0, ("Address needs to be positive")); 205 KASSERT(segs[i].ds_addr + segs[i].ds_len < maxaddr, 206 ("Address not in range")); 207 if (error < 0) { 208 panic("IOMMU mapping error: %d\n", error); 209 return (ENOMEM); 210 } 211 } 212 213 return (0); 214 } 215 216 int 217 phyp_iommu_unmap(device_t dev, bus_dma_segment_t *segs, int nsegs, void *cookie) 218 { 219 struct dma_window *window = cookie; 220 bus_addr_t pageround; 221 bus_size_t roundedsize; 222 int i; 223 bus_addr_t j; 224 225 for (i = 0; i < nsegs; i++) { 226 pageround = trunc_page(segs[i].ds_addr); 227 roundedsize = round_page(segs[i].ds_len + 228 (segs[i].ds_addr & PAGE_MASK)); 229 230 if (papr_supports_stuff_tce) { 231 phyp_hcall(H_STUFF_TCE, window->map->iobn, pageround, 0, 232 roundedsize/PAGE_SIZE); 233 } else { 234 for (j = 0; j < roundedsize; j += PAGE_SIZE) 235 phyp_hcall(H_PUT_TCE, window->map->iobn, 236 pageround + j, 0); 237 } 238 239 vmem_xfree(window->map->vmem, pageround, roundedsize); 240 } 241 242 return (0); 243 } 244