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 = NULL; 103 char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge"; 104 int err; 105 106 root = pcibios_select_root(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 int pci_assign_resource(struct pci_dev *dev, int resno) 124 { 125 struct pci_bus *bus = dev->bus; 126 struct resource *res = dev->resource + resno; 127 resource_size_t size, min, align; 128 int ret; 129 130 size = resource_size(res); 131 min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM; 132 133 align = resource_alignment(res); 134 if (!align) { 135 dev_info(&dev->dev, "BAR %d: can't allocate resource (bogus " 136 "alignment) %pR flags %#lx\n", 137 resno, res, res->flags); 138 return -EINVAL; 139 } 140 141 /* First, try exact prefetching match.. */ 142 ret = pci_bus_alloc_resource(bus, res, size, align, min, 143 IORESOURCE_PREFETCH, 144 pcibios_align_resource, dev); 145 146 if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) { 147 /* 148 * That failed. 149 * 150 * But a prefetching area can handle a non-prefetching 151 * window (it will just not perform as well). 152 */ 153 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0, 154 pcibios_align_resource, dev); 155 } 156 157 if (ret) { 158 dev_info(&dev->dev, "BAR %d: can't allocate %s resource %pR\n", 159 resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res); 160 } else { 161 res->flags &= ~IORESOURCE_STARTALIGN; 162 if (resno < PCI_BRIDGE_RESOURCES) 163 pci_update_resource(dev, resno); 164 } 165 166 return ret; 167 } 168 169 #if 0 170 int pci_assign_resource_fixed(struct pci_dev *dev, int resno) 171 { 172 struct pci_bus *bus = dev->bus; 173 struct resource *res = dev->resource + resno; 174 unsigned int type_mask; 175 int i, ret = -EBUSY; 176 177 type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH; 178 179 for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) { 180 struct resource *r = bus->resource[i]; 181 if (!r) 182 continue; 183 184 /* type_mask must match */ 185 if ((res->flags ^ r->flags) & type_mask) 186 continue; 187 188 ret = request_resource(r, res); 189 190 if (ret == 0) 191 break; 192 } 193 194 if (ret) { 195 dev_err(&dev->dev, "BAR %d: can't allocate %s resource %pR\n", 196 resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res); 197 } else if (resno < PCI_BRIDGE_RESOURCES) { 198 pci_update_resource(dev, resno); 199 } 200 201 return ret; 202 } 203 EXPORT_SYMBOL_GPL(pci_assign_resource_fixed); 204 #endif 205 206 /* Sort resources by alignment */ 207 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head) 208 { 209 int i; 210 211 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 212 struct resource *r; 213 struct resource_list *list, *tmp; 214 resource_size_t r_align; 215 216 r = &dev->resource[i]; 217 218 if (r->flags & IORESOURCE_PCI_FIXED) 219 continue; 220 221 if (!(r->flags) || r->parent) 222 continue; 223 224 r_align = resource_alignment(r); 225 if (!r_align) { 226 dev_warn(&dev->dev, "BAR %d: bogus alignment " 227 "%pR flags %#lx\n", 228 i, r, r->flags); 229 continue; 230 } 231 for (list = head; ; list = list->next) { 232 resource_size_t align = 0; 233 struct resource_list *ln = list->next; 234 235 if (ln) 236 align = resource_alignment(ln->res); 237 238 if (r_align > align) { 239 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL); 240 if (!tmp) 241 panic("pdev_sort_resources(): " 242 "kmalloc() failed!\n"); 243 tmp->next = ln; 244 tmp->res = r; 245 tmp->dev = dev; 246 list->next = tmp; 247 break; 248 } 249 } 250 } 251 } 252 253 int pci_enable_resources(struct pci_dev *dev, int mask) 254 { 255 u16 cmd, old_cmd; 256 int i; 257 struct resource *r; 258 259 pci_read_config_word(dev, PCI_COMMAND, &cmd); 260 old_cmd = cmd; 261 262 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 263 if (!(mask & (1 << i))) 264 continue; 265 266 r = &dev->resource[i]; 267 268 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM))) 269 continue; 270 if ((i == PCI_ROM_RESOURCE) && 271 (!(r->flags & IORESOURCE_ROM_ENABLE))) 272 continue; 273 274 if (!r->parent) { 275 dev_err(&dev->dev, "device not available because of " 276 "BAR %d %pR collisions\n", i, r); 277 return -EINVAL; 278 } 279 280 if (r->flags & IORESOURCE_IO) 281 cmd |= PCI_COMMAND_IO; 282 if (r->flags & IORESOURCE_MEM) 283 cmd |= PCI_COMMAND_MEMORY; 284 } 285 286 if (cmd != old_cmd) { 287 dev_info(&dev->dev, "enabling device (%04x -> %04x)\n", 288 old_cmd, cmd); 289 pci_write_config_word(dev, PCI_COMMAND, cmd); 290 } 291 return 0; 292 } 293