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 dev_dbg(&dev->dev, "BAR %d: got res %pR bus [%#llx-%#llx] " 55 "flags %#lx\n", resno, res, 56 (unsigned long long)region.start, 57 (unsigned long long)region.end, 58 (unsigned long)res->flags); 59 60 new = region.start | (res->flags & PCI_REGION_FLAG_MASK); 61 if (res->flags & IORESOURCE_IO) 62 mask = (u32)PCI_BASE_ADDRESS_IO_MASK; 63 else 64 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK; 65 66 reg = pci_resource_bar(dev, resno, &type); 67 if (!reg) 68 return; 69 if (type != pci_bar_unknown) { 70 if (!(res->flags & IORESOURCE_ROM_ENABLE)) 71 return; 72 new |= PCI_ROM_ADDRESS_ENABLE; 73 } 74 75 pci_write_config_dword(dev, reg, new); 76 pci_read_config_dword(dev, reg, &check); 77 78 if ((new ^ check) & mask) { 79 dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n", 80 resno, new, check); 81 } 82 83 if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) == 84 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) { 85 new = region.start >> 16 >> 16; 86 pci_write_config_dword(dev, reg + 4, new); 87 pci_read_config_dword(dev, reg + 4, &check); 88 if (check != new) { 89 dev_err(&dev->dev, "BAR %d: error updating " 90 "(high %#08x != %#08x)\n", resno, new, check); 91 } 92 } 93 res->flags &= ~IORESOURCE_UNSET; 94 dev_dbg(&dev->dev, "BAR %d: moved to bus [%#llx-%#llx] flags %#lx\n", 95 resno, (unsigned long long)region.start, 96 (unsigned long long)region.end, res->flags); 97 } 98 99 int pci_claim_resource(struct pci_dev *dev, int resource) 100 { 101 struct resource *res = &dev->resource[resource]; 102 struct resource *root; 103 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; 104 int err; 105 106 root = pci_find_parent_resource(dev, res); 107 108 err = -EINVAL; 109 if (root != NULL) 110 err = insert_resource(root, res); 111 112 if (err) { 113 dev_err(&dev->dev, "BAR %d: %s of %s %pR\n", 114 resource, 115 root ? "address space collision on" : 116 "no parent found for", 117 dtype, res); 118 } 119 120 return err; 121 } 122 123 #ifdef CONFIG_PCI_QUIRKS 124 void pci_disable_bridge_window(struct pci_dev *dev) 125 { 126 dev_dbg(&dev->dev, "Disabling bridge window.\n"); 127 128 /* MMIO Base/Limit */ 129 pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0); 130 131 /* Prefetchable MMIO Base/Limit */ 132 pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0); 133 pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0); 134 pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff); 135 } 136 #endif /* CONFIG_PCI_QUIRKS */ 137 138 static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev, 139 int resno) 140 { 141 struct resource *res = dev->resource + resno; 142 resource_size_t size, min, align; 143 int ret; 144 145 size = resource_size(res); 146 min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; 147 align = resource_alignment(res); 148 149 /* First, try exact prefetching match.. */ 150 ret = pci_bus_alloc_resource(bus, res, size, align, min, 151 IORESOURCE_PREFETCH, 152 pcibios_align_resource, dev); 153 154 if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) { 155 /* 156 * That failed. 157 * 158 * But a prefetching area can handle a non-prefetching 159 * window (it will just not perform as well). 160 */ 161 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, 162 pcibios_align_resource, dev); 163 } 164 165 if (!ret) { 166 res->flags &= ~IORESOURCE_STARTALIGN; 167 if (resno < PCI_BRIDGE_RESOURCES) 168 pci_update_resource(dev, resno); 169 } 170 171 return ret; 172 } 173 174 int pci_assign_resource(struct pci_dev *dev, int resno) 175 { 176 struct resource *res = dev->resource + resno; 177 resource_size_t align; 178 struct pci_bus *bus; 179 int ret; 180 181 align = resource_alignment(res); 182 if (!align) { 183 dev_info(&dev->dev, "BAR %d: can't allocate resource (bogus " 184 "alignment) %pR flags %#lx\n", 185 resno, res, res->flags); 186 return -EINVAL; 187 } 188 189 bus = dev->bus; 190 while ((ret = __pci_assign_resource(bus, dev, resno))) { 191 if (bus->parent && bus->self->transparent) 192 bus = bus->parent; 193 else 194 bus = NULL; 195 if (bus) 196 continue; 197 break; 198 } 199 200 if (ret) 201 dev_info(&dev->dev, "BAR %d: can't allocate %s resource %pR\n", 202 resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res); 203 204 return ret; 205 } 206 207 #if 0 208 int pci_assign_resource_fixed(struct pci_dev *dev, int resno) 209 { 210 struct pci_bus *bus = dev->bus; 211 struct resource *res = dev->resource + resno; 212 unsigned int type_mask; 213 int i, ret = -EBUSY; 214 215 type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH; 216 217 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { 218 struct resource *r = bus->resource[i]; 219 if (!r) 220 continue; 221 222 /* type_mask must match */ 223 if ((res->flags ^ r->flags) & type_mask) 224 continue; 225 226 ret = request_resource(r, res); 227 228 if (ret == 0) 229 break; 230 } 231 232 if (ret) { 233 dev_err(&dev->dev, "BAR %d: can't allocate %s resource %pR\n", 234 resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res); 235 } else if (resno < PCI_BRIDGE_RESOURCES) { 236 pci_update_resource(dev, resno); 237 } 238 239 return ret; 240 } 241 EXPORT_SYMBOL_GPL(pci_assign_resource_fixed); 242 #endif 243 244 /* Sort resources by alignment */ 245 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head) 246 { 247 int i; 248 249 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 250 struct resource *r; 251 struct resource_list *list, *tmp; 252 resource_size_t r_align; 253 254 r = &dev->resource[i]; 255 256 if (r->flags & IORESOURCE_PCI_FIXED) 257 continue; 258 259 if (!(r->flags) || r->parent) 260 continue; 261 262 r_align = resource_alignment(r); 263 if (!r_align) { 264 dev_warn(&dev->dev, "BAR %d: bogus alignment " 265 "%pR flags %#lx\n", 266 i, r, r->flags); 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 = resource_alignment(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 because of " 314 "BAR %d %pR collisions\n", i, 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