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 = 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 }