1 /* 2 * drivers/pci/setup-res.c 3 * 4 * Extruded from code written by 5 * Dave Rusling (david.rusling@reo.mts.dec.com) 6 * David Mosberger (davidm@cs.arizona.edu) 7 * David Miller (davem@redhat.com) 8 * 9 * Support routines for initializing a PCI subsystem. 10 */ 11 12 /* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */ 13 14 /* 15 * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru> 16 * Resource sorting 17 */ 18 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/pci.h> 22 #include <linux/errno.h> 23 #include <linux/ioport.h> 24 #include <linux/cache.h> 25 #include <linux/slab.h> 26 #include "pci.h" 27 28 29 void pci_update_resource(struct pci_dev *dev, int resno) 30 { 31 struct pci_bus_region region; 32 u32 new, check, mask; 33 int reg; 34 enum pci_bar_type type; 35 struct resource *res = dev->resource + resno; 36 37 /* 38 * Ignore resources for unimplemented BARs and unused resource slots 39 * for 64 bit BARs. 40 */ 41 if (!res->flags) 42 return; 43 44 /* 45 * Ignore non-moveable resources. This might be legacy resources for 46 * which no functional BAR register exists or another important 47 * system resource we shouldn't move around. 48 */ 49 if (res->flags & IORESOURCE_PCI_FIXED) 50 return; 51 52 pcibios_resource_to_bus(dev, ®ion, res); 53 54 new = region.start | (res->flags & PCI_REGION_FLAG_MASK); 55 if (res->flags & IORESOURCE_IO) 56 mask = (u32)PCI_BASE_ADDRESS_IO_MASK; 57 else 58 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; 59 60 reg = pci_resource_bar(dev, resno, &type); 61 if (!reg) 62 return; 63 if (type != pci_bar_unknown) { 64 if (!(res->flags & IORESOURCE_ROM_ENABLE)) 65 return; 66 new |= PCI_ROM_ADDRESS_ENABLE; 67 } 68 69 pci_write_config_dword(dev, reg, new); 70 pci_read_config_dword(dev, reg, &check); 71 72 if ((new ^ check) & mask) { 73 dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n", 74 resno, new, check); 75 } 76 77 if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) == 78 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) { 79 new = region.start >> 16 >> 16; 80 pci_write_config_dword(dev, reg + 4, new); 81 pci_read_config_dword(dev, reg + 4, &check); 82 if (check != new) { 83 dev_err(&dev->dev, "BAR %d: error updating " 84 "(high %#08x != %#08x)\n", resno, new, check); 85 } 86 } 87 res->flags &= ~IORESOURCE_UNSET; 88 dev_info(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx])\n", 89 resno, res, (unsigned long long)region.start, 90 (unsigned long long)region.end); 91 } 92 93 int pci_claim_resource(struct pci_dev *dev, int resource) 94 { 95 struct resource *res = &dev->resource[resource]; 96 struct resource *root, *conflict; 97 98 root = pci_find_parent_resource(dev, res); 99 if (!root) { 100 dev_info(&dev->dev, "no compatible bridge window for %pR\n", 101 res); 102 return -EINVAL; 103 } 104 105 conflict = request_resource_conflict(root, res); 106 if (conflict) { 107 dev_info(&dev->dev, 108 "address space collision: %pR conflicts with %s %pR\n", 109 res, conflict->name, conflict); 110 return -EBUSY; 111 } 112 113 return 0; 114 } 115 EXPORT_SYMBOL(pci_claim_resource); 116 117 #ifdef CONFIG_PCI_QUIRKS 118 void pci_disable_bridge_window(struct pci_dev *dev) 119 { 120 dev_info(&dev->dev, "disabling bridge mem windows\n"); 121 122 /* MMIO Base/Limit */ 123 pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0); 124 125 /* Prefetchable MMIO Base/Limit */ 126 pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0); 127 pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0); 128 pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff); 129 } 130 #endif /* CONFIG_PCI_QUIRKS */ 131 132 static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, 133 int resno) 134 { 135 struct resource *res = dev->resource + resno; 136 resource_size_t size, min, align; 137 int ret; 138 139 size = resource_size(res); 140 min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; 141 align = pci_resource_alignment(dev, res); 142 143 /* First, try exact prefetching match.. */ 144 ret = pci_bus_alloc_resource(bus, res, size, align, min, 145 IORESOURCE_PREFETCH, 146 pcibios_align_resource, dev); 147 148 if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) { 149 /* 150 * That failed. 151 * 152 * But a prefetching area can handle a non-prefetching 153 * window (it will just not perform as well). 154 */ 155 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, 156 pcibios_align_resource, dev); 157 } 158 159 if (ret < 0 && dev->fw_addr[resno]) { 160 struct resource *root, *conflict; 161 resource_size_t start, end; 162 163 /* 164 * If we failed to assign anything, let's try the address 165 * where firmware left it. That at least has a chance of 166 * working, which is better than just leaving it disabled. 167 */ 168 169 if (res->flags & IORESOURCE_IO) 170 root = &ioport_resource; 171 else 172 root = &iomem_resource; 173 174 start = res->start; 175 end = res->end; 176 res->start = dev->fw_addr[resno]; 177 res->end = res->start + size - 1; 178 dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n", 179 resno, res); 180 conflict = request_resource_conflict(root, res); 181 if (conflict) { 182 dev_info(&dev->dev, 183 "BAR %d: %pR conflicts with %s %pR\n", resno, 184 res, conflict->name, conflict); 185 res->start = start; 186 res->end = end; 187 } else 188 ret = 0; 189 } 190 191 if (!ret) { 192 res->flags &= ~IORESOURCE_STARTALIGN; 193 dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res); 194 if (resno < PCI_BRIDGE_RESOURCES) 195 pci_update_resource(dev, resno); 196 } 197 198 return ret; 199 } 200 201 int pci_assign_resource(struct pci_dev *dev, int resno) 202 { 203 struct resource *res = dev->resource + resno; 204 resource_size_t align; 205 struct pci_bus *bus; 206 int ret; 207 char *type; 208 209 align = pci_resource_alignment(dev, res); 210 if (!align) { 211 dev_info(&dev->dev, "BAR %d: can't assign %pR " 212 "(bogus alignment)\n", resno, res); 213 return -EINVAL; 214 } 215 216 bus = dev->bus; 217 while ((ret = __pci_assign_resource(bus, dev, resno))) { 218 if (bus->parent && bus->self->transparent) 219 bus = bus->parent; 220 else 221 bus = NULL; 222 if (bus) 223 continue; 224 break; 225 } 226 227 if (ret) { 228 if (res->flags & IORESOURCE_MEM) 229 if (res->flags & IORESOURCE_PREFETCH) 230 type = "mem pref"; 231 else 232 type = "mem"; 233 else if (res->flags & IORESOURCE_IO) 234 type = "io"; 235 else 236 type = "unknown"; 237 dev_info(&dev->dev, 238 "BAR %d: can't assign %s (size %#llx)\n", 239 resno, type, (unsigned long long) resource_size(res)); 240 } 241 242 return ret; 243 } 244 245 /* Sort resources by alignment */ 246 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head) 247 { 248 int i; 249 250 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 251 struct resource *r; 252 struct resource_list *list, *tmp; 253 resource_size_t r_align; 254 255 r = &dev->resource[i]; 256 257 if (r->flags & IORESOURCE_PCI_FIXED) 258 continue; 259 260 if (!(r->flags) || r->parent) 261 continue; 262 263 r_align = pci_resource_alignment(dev, r); 264 if (!r_align) { 265 dev_warn(&dev->dev, "BAR %d: %pR has bogus alignment\n", 266 i, r); 267 continue; 268 } 269 for (list = head; ; list = list->next) { 270 resource_size_t align = 0; 271 struct resource_list *ln = list->next; 272 273 if (ln) 274 align = pci_resource_alignment(ln->dev, ln->res); 275 276 if (r_align > align) { 277 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); 278 if (!tmp) 279 panic("pdev_sort_resources(): " 280 "kmalloc() failed!\n"); 281 tmp->next = ln; 282 tmp->res = r; 283 tmp->dev = dev; 284 list->next = tmp; 285 break; 286 } 287 } 288 } 289 } 290 291 int pci_enable_resources(struct pci_dev *dev, int mask) 292 { 293 u16 cmd, old_cmd; 294 int i; 295 struct resource *r; 296 297 pci_read_config_word(dev, PCI_COMMAND, &cmd); 298 old_cmd = cmd; 299 300 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 301 if (!(mask & (1 << i))) 302 continue; 303 304 r = &dev->resource[i]; 305 306 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM))) 307 continue; 308 if ((i == PCI_ROM_RESOURCE) && 309 (!(r->flags & IORESOURCE_ROM_ENABLE))) 310 continue; 311 312 if (!r->parent) { 313 dev_err(&dev->dev, "device not available " 314 "(can't reserve %pR)\n", r); 315 return -EINVAL; 316 } 317 318 if (r->flags & IORESOURCE_IO) 319 cmd |= PCI_COMMAND_IO; 320 if (r->flags & IORESOURCE_MEM) 321 cmd |= PCI_COMMAND_MEMORY; 322 } 323 324 if (cmd != old_cmd) { 325 dev_info(&dev->dev, "enabling device (%04x -> %04x)\n", 326 old_cmd, cmd); 327 pci_write_config_word(dev, PCI_COMMAND, cmd); 328 } 329 return 0; 330 } 331