drivers/pci/setup-res.c

   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, &region, 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         int err;
 104
 105         root = pci_find_parent_resource(dev, res);
 106
 107         err = -EINVAL;
 108         if (root != NULL)
 109                 err = request_resource(root, res);
 110
 111         if (err) {
 112                 const char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
 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 EXPORT_SYMBOL(pci_claim_resource);
 123
 124 #ifdef CONFIG_PCI_QUIRKS
 125 void pci_disable_bridge_window(struct pci_dev *dev)
 126 {
 127         dev_dbg(&dev->dev, "Disabling bridge window.\n");
 128
 129         /* MMIO Base/Limit */
 130         pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
 131
 132         /* Prefetchable MMIO Base/Limit */
 133         pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
 134         pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
 135         pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
 136 }
 137 #endif  /* CONFIG_PCI_QUIRKS */
 138
 139 static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
 140                                  int resno)
 141 {
 142         struct resource *res = dev->resource + resno;
 143         resource_size_t size, min, align;
 144         int ret;
 145
 146         size = resource_size(res);
 147         min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
 148         align = pci_resource_alignment(dev, res);
 149
 150         /* First, try exact prefetching match.. */
 151         ret = pci_bus_alloc_resource(bus, res, size, align, min,
 152                                      IORESOURCE_PREFETCH,
 153                                      pcibios_align_resource, dev);
 154
 155         if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
 156                 /*
 157                  * That failed.
 158                  *
 159                  * But a prefetching area can handle a non-prefetching
 160                  * window (it will just not perform as well).
 161                  */
 162                 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
 163                                              pcibios_align_resource, dev);
 164         }
 165
 166         if (!ret) {
 167                 res->flags &= ~IORESOURCE_STARTALIGN;
 168                 if (resno < PCI_BRIDGE_RESOURCES)
 169                         pci_update_resource(dev, resno);
 170         }
 171
 172         return ret;
 173 }
 174
 175 int pci_assign_resource(struct pci_dev *dev, int resno)
 176 {
 177         struct resource *res = dev->resource + resno;
 178         resource_size_t align;
 179         struct pci_bus *bus;
 180         int ret;
 181
 182         align = pci_resource_alignment(dev, res);
 183         if (!align) {
 184                 dev_info(&dev->dev, "BAR %d: can't allocate resource (bogus "
 185                         "alignment) %pR flags %#lx\n",
 186                         resno, res, res->flags);
 187                 return -EINVAL;
 188         }
 189
 190         bus = dev->bus;
 191         while ((ret = __pci_assign_resource(bus, dev, resno))) {
 192                 if (bus->parent && bus->self->transparent)
 193                         bus = bus->parent;
 194                 else
 195                         bus = NULL;
 196                 if (bus)
 197                         continue;
 198                 break;
 199         }
 200
 201         if (ret)
 202                 dev_info(&dev->dev, "BAR %d: can't allocate %s resource %pR\n",
 203                         resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res);
 204
 205         return ret;
 206 }
 207
 208 /* Sort resources by alignment */
 209 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
 210 {
 211         int i;
 212
 213         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 214                 struct resource *r;
 215                 struct resource_list *list, *tmp;
 216                 resource_size_t r_align;
 217
 218                 r = &dev->resource[i];
 219
 220                 if (r->flags & IORESOURCE_PCI_FIXED)
 221                         continue;
 222
 223                 if (!(r->flags) || r->parent)
 224                         continue;
 225
 226                 r_align = pci_resource_alignment(dev, r);
 227                 if (!r_align) {
 228                         dev_warn(&dev->dev, "BAR %d: bogus alignment "
 229                                 "%pR flags %#lx\n",
 230                                 i, r, r->flags);
 231                         continue;
 232                 }
 233                 for (list = head; ; list = list->next) {
 234                         resource_size_t align = 0;
 235                         struct resource_list *ln = list->next;
 236
 237                         if (ln)
 238                                 align = pci_resource_alignment(ln->dev, ln->res);
 239
 240                         if (r_align > align) {
 241                                 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
 242                                 if (!tmp)
 243                                         panic("pdev_sort_resources(): "
 244                                               "kmalloc() failed!\n");
 245                                 tmp->next = ln;
 246                                 tmp->res = r;
 247                                 tmp->dev = dev;
 248                                 list->next = tmp;
 249                                 break;
 250                         }
 251                 }
 252         }
 253 }
 254
 255 int pci_enable_resources(struct pci_dev *dev, int mask)
 256 {
 257         u16 cmd, old_cmd;
 258         int i;
 259         struct resource *r;
 260
 261         pci_read_config_word(dev, PCI_COMMAND, &cmd);
 262         old_cmd = cmd;
 263
 264         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 265                 if (!(mask & (1 << i)))
 266                         continue;
 267
 268                 r = &dev->resource[i];
 269
 270                 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
 271                         continue;
 272                 if ((i == PCI_ROM_RESOURCE) &&
 273                                 (!(r->flags & IORESOURCE_ROM_ENABLE)))
 274                         continue;
 275
 276                 if (!r->parent) {
 277                         dev_err(&dev->dev, "device not available because of "
 278                                 "BAR %d %pR collisions\n", i, r);
 279                         return -EINVAL;
 280                 }
 281
 282                 if (r->flags & IORESOURCE_IO)
 283                         cmd |= PCI_COMMAND_IO;
 284                 if (r->flags & IORESOURCE_MEM)
 285                         cmd |= PCI_COMMAND_MEMORY;
 286         }
 287
 288         if (cmd != old_cmd) {
 289                 dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
 290                          old_cmd, cmd);
 291                 pci_write_config_word(dev, PCI_COMMAND, cmd);
 292         }
 293         return 0;
 294 }