1 /*- 2 * Copyright (c) 2013, Nathan Whitehorn <nwhitehorn@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/bus.h> 32 #include <sys/kernel.h> 33 #include <sys/libkern.h> 34 #include <sys/module.h> 35 #include <sys/vmem.h> 36 37 #include <dev/ofw/ofw_bus.h> 38 #include <dev/ofw/ofw_bus_subr.h> 39 #include <dev/ofw/openfirm.h> 40 41 #include <machine/bus.h> 42 43 #include <powerpc/pseries/phyp-hvcall.h> 44 #include <powerpc/pseries/plpar_iommu.h> 45 46 MALLOC_DEFINE(M_PHYPIOMMU, "iommu", "IOMMU data for PAPR LPARs"); 47 48 struct papr_iommu_map { 49 uint32_t iobn; 50 vmem_t *vmem; 51 struct papr_iommu_map *next; 52 }; 53 54 static SLIST_HEAD(iommu_maps, iommu_map) iommu_map_head = 55 SLIST_HEAD_INITIALIZER(iommu_map_head); 56 static int papr_supports_stuff_tce = -1; 57 58 struct iommu_map { 59 uint32_t iobn; 60 vmem_t *vmem; 61 62 SLIST_ENTRY(iommu_map) entries; 63 }; 64 65 struct dma_window { 66 struct iommu_map *map; 67 bus_addr_t start; 68 bus_addr_t end; 69 }; 70 71 int 72 phyp_iommu_set_dma_tag(device_t bus, device_t dev, bus_dma_tag_t tag) 73 { 74 device_t p; 75 phandle_t node; 76 cell_t dma_acells, dma_scells, dmawindow[5]; 77 struct iommu_map *i; 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_getprop(node, "ibm,#dma-size-cells", &dma_scells, 91 sizeof(cell_t)) <= 0) 92 OF_searchprop(node, "#size-cells", &dma_scells, sizeof(cell_t)); 93 if (OF_getprop(node, "ibm,#dma-address-cells", &dma_acells, 94 sizeof(cell_t)) <= 0) 95 OF_searchprop(node, "#address-cells", &dma_acells, 96 sizeof(cell_t)); 97 98 if (ofw_bus_has_prop(p, "ibm,my-dma-window")) 99 OF_getprop(node, "ibm,my-dma-window", dmawindow, 100 sizeof(cell_t)*(dma_scells + dma_acells + 1)); 101 else 102 OF_getprop(node, "ibm,dma-window", dmawindow, 103 sizeof(cell_t)*(dma_scells + dma_acells + 1)); 104 105 struct dma_window *window = malloc(sizeof(struct dma_window), 106 M_PHYPIOMMU, M_WAITOK); 107 if (dma_acells == 1) 108 window->start = dmawindow[1]; 109 else 110 window->start = ((uint64_t)(dmawindow[1]) << 32) | dmawindow[2]; 111 if (dma_scells == 1) 112 window->end = window->start + dmawindow[dma_acells + 1]; 113 else 114 window->end = window->start + 115 (((uint64_t)(dmawindow[dma_acells + 1]) << 32) | 116 dmawindow[dma_acells + 2]); 117 118 if (bootverbose) 119 device_printf(dev, "Mapping IOMMU domain %#x\n", dmawindow[0]); 120 window->map = NULL; 121 SLIST_FOREACH(i, &iommu_map_head, entries) { 122 if (i->iobn == dmawindow[0]) { 123 window->map = i; 124 break; 125 } 126 } 127 128 if (window->map == NULL) { 129 window->map = malloc(sizeof(struct iommu_map), M_PHYPIOMMU, 130 M_WAITOK); 131 window->map->iobn = dmawindow[0]; 132 /* 133 * Allocate IOMMU range beginning at PAGE_SIZE. Some drivers 134 * (em(4), for example) do not like getting mappings at 0. 135 */ 136 window->map->vmem = vmem_create("IOMMU mappings", PAGE_SIZE, 137 trunc_page(VMEM_ADDR_MAX) - PAGE_SIZE, PAGE_SIZE, 0, 138 M_BESTFIT | M_NOWAIT); 139 SLIST_INSERT_HEAD(&iommu_map_head, window->map, entries); 140 } 141 142 /* 143 * Check experimentally whether we can use H_STUFF_TCE. It is required 144 * by the spec but some firmware (e.g. QEMU) does not actually support 145 * it 146 */ 147 if (papr_supports_stuff_tce == -1) 148 papr_supports_stuff_tce = !(phyp_hcall(H_STUFF_TCE, 149 window->map->iobn, 0, 0, 0) == H_FUNCTION); 150 151 bus_dma_tag_set_iommu(tag, bus, window); 152 153 return (0); 154 } 155 156 int 157 phyp_iommu_map(device_t dev, bus_dma_segment_t *segs, int *nsegs, 158 bus_addr_t min, bus_addr_t max, bus_size_t alignment, bus_addr_t boundary, 159 void *cookie) 160 { 161 struct dma_window *window = cookie; 162 bus_addr_t minaddr, maxaddr; 163 bus_addr_t alloced; 164 bus_size_t allocsize; 165 int error, i, j; 166 uint64_t tce; 167 minaddr = window->start; 168 maxaddr = window->end; 169 170 /* XXX: handle exclusion range in a more useful way */ 171 if (min < maxaddr) 172 maxaddr = min; 173 174 /* XXX: consolidate segs? */ 175 for (i = 0; i < *nsegs; i++) { 176 allocsize = round_page(segs[i].ds_len + 177 (segs[i].ds_addr & PAGE_MASK)); 178 error = vmem_xalloc(window->map->vmem, allocsize, 179 (alignment < PAGE_SIZE) ? PAGE_SIZE : alignment, 0, 180 boundary, minaddr, maxaddr, M_BESTFIT | M_NOWAIT, &alloced); 181 if (error != 0) { 182 panic("VMEM failure: %d\n", error); 183 return (error); 184 } 185 KASSERT(alloced % PAGE_SIZE == 0, ("Alloc not page aligned")); 186 KASSERT((alloced + (segs[i].ds_addr & PAGE_MASK)) % 187 alignment == 0, 188 ("Allocated segment does not match alignment constraint")); 189 190 tce = trunc_page(segs[i].ds_addr); 191 tce |= 0x3; /* read/write */ 192 if (papr_supports_stuff_tce) { 193 error = phyp_hcall(H_STUFF_TCE, window->map->iobn, 194 alloced, tce, allocsize/PAGE_SIZE); 195 } else { 196 for (j = 0; j < allocsize; j += PAGE_SIZE) 197 error = phyp_hcall(H_PUT_TCE, window->map->iobn, 198 alloced + j, tce + j); 199 } 200 201 segs[i].ds_addr = alloced + (segs[i].ds_addr & PAGE_MASK); 202 KASSERT(segs[i].ds_addr > 0, ("Address needs to be positive")); 203 KASSERT(segs[i].ds_addr + segs[i].ds_len < maxaddr, 204 ("Address not in range")); 205 if (error < 0) { 206 panic("IOMMU mapping error: %d\n", error); 207 return (ENOMEM); 208 } 209 } 210 211 return (0); 212 } 213 214 int 215 phyp_iommu_unmap(device_t dev, bus_dma_segment_t *segs, int nsegs, void *cookie) 216 { 217 struct dma_window *window = cookie; 218 bus_addr_t pageround; 219 bus_size_t roundedsize; 220 int i; 221 bus_addr_t j; 222 223 for (i = 0; i < nsegs; i++) { 224 pageround = trunc_page(segs[i].ds_addr); 225 roundedsize = round_page(segs[i].ds_len + 226 (segs[i].ds_addr & PAGE_MASK)); 227 228 if (papr_supports_stuff_tce) { 229 phyp_hcall(H_STUFF_TCE, window->map->iobn, pageround, 0, 230 roundedsize/PAGE_SIZE); 231 } else { 232 for (j = 0; j < roundedsize; j += PAGE_SIZE) 233 phyp_hcall(H_PUT_TCE, window->map->iobn, 234 pageround + j, 0); 235 } 236 237 vmem_xfree(window->map->vmem, pageround, roundedsize); 238 } 239 240 return (0); 241 } 242 243