arch/x86/pci/acpi.c

   1 #include <linux/pci.h>
   2 #include <linux/acpi.h>
   3 #include <linux/init.h>
   4 #include <linux/irq.h>
   5 #include <linux/dmi.h>
   6 #include <linux/slab.h>
   7 #include <asm/numa.h>
   8 #include <asm/pci_x86.h>
   9
  10 struct pci_root_info {
  11         struct acpi_device *bridge;
  12         char *name;
  13         unsigned int res_num;
  14         struct resource *res;
  15         struct pci_bus *bus;
  16         int busnum;
  17 };
  18
  19 static bool pci_use_crs = true;
  20
  21 static int __init set_use_crs(const struct dmi_system_id *id)
  22 {
  23         pci_use_crs = true;
  24         return 0;
  25 }
  26
  27 static const struct dmi_system_id pci_use_crs_table[] __initconst = {
  28         /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
  29         {
  30                 .callback = set_use_crs,
  31                 .ident = "IBM System x3800",
  32                 .matches = {
  33                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  34                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
  35                 },
  36         },
  37         {}
  38 };
  39
  40 void __init pci_acpi_crs_quirks(void)
  41 {
  42         int year;
  43
  44         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
  45                 pci_use_crs = false;
  46
  47         dmi_check_system(pci_use_crs_table);
  48
  49         /*
  50          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
  51          * takes precedence over anything we figured out above.
  52          */
  53         if (pci_probe & PCI_ROOT_NO_CRS)
  54                 pci_use_crs = false;
  55         else if (pci_probe & PCI_USE__CRS)
  56                 pci_use_crs = true;
  57
  58         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
  59                "if necessary, use \"pci=%s\" and report a bug\n",
  60                pci_use_crs ? "Using" : "Ignoring",
  61                pci_use_crs ? "nocrs" : "use_crs");
  62 }
  63
  64 static acpi_status
  65 resource_to_addr(struct acpi_resource *resource,
  66                         struct acpi_resource_address64 *addr)
  67 {
  68         acpi_status status;
  69
  70         status = acpi_resource_to_address64(resource, addr);
  71         if (ACPI_SUCCESS(status) &&
  72             (addr->resource_type == ACPI_MEMORY_RANGE ||
  73             addr->resource_type == ACPI_IO_RANGE) &&
  74             addr->address_length > 0) {
  75                 return AE_OK;
  76         }
  77         return AE_ERROR;
  78 }
  79
  80 static acpi_status
  81 count_resource(struct acpi_resource *acpi_res, void *data)
  82 {
  83         struct pci_root_info *info = data;
  84         struct acpi_resource_address64 addr;
  85         acpi_status status;
  86
  87         status = resource_to_addr(acpi_res, &addr);
  88         if (ACPI_SUCCESS(status))
  89                 info->res_num++;
  90         return AE_OK;
  91 }
  92
  93 static void
  94 align_resource(struct acpi_device *bridge, struct resource *res)
  95 {
  96         int align = (res->flags & IORESOURCE_MEM) ? 16 : 4;
  97
  98         /*
  99          * Host bridge windows are not BARs, but the decoders on the PCI side
 100          * that claim this address space have starting alignment and length
 101          * constraints, so fix any obvious BIOS goofs.
 102          */
 103         if (!IS_ALIGNED(res->start, align)) {
 104                 dev_printk(KERN_DEBUG, &bridge->dev,
 105                            "host bridge window %pR invalid; "
 106                            "aligning start to %d-byte boundary\n", res, align);
 107                 res->start &= ~(align - 1);
 108         }
 109         if (!IS_ALIGNED(res->end + 1, align)) {
 110                 dev_printk(KERN_DEBUG, &bridge->dev,
 111                            "host bridge window %pR invalid; "
 112                            "aligning end to %d-byte boundary\n", res, align);
 113                 res->end = ALIGN(res->end, align) - 1;
 114         }
 115 }
 116
 117 static acpi_status
 118 setup_resource(struct acpi_resource *acpi_res, void *data)
 119 {
 120         struct pci_root_info *info = data;
 121         struct resource *res;
 122         struct acpi_resource_address64 addr;
 123         acpi_status status;
 124         unsigned long flags;
 125         struct resource *root, *conflict;
 126         u64 start, end, max_len;
 127
 128         status = resource_to_addr(acpi_res, &addr);
 129         if (!ACPI_SUCCESS(status))
 130                 return AE_OK;
 131
 132         if (addr.resource_type == ACPI_MEMORY_RANGE) {
 133                 root = &iomem_resource;
 134                 flags = IORESOURCE_MEM;
 135                 if (addr.info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
 136                         flags |= IORESOURCE_PREFETCH;
 137         } else if (addr.resource_type == ACPI_IO_RANGE) {
 138                 root = &ioport_resource;
 139                 flags = IORESOURCE_IO;
 140         } else
 141                 return AE_OK;
 142
 143         max_len = addr.maximum - addr.minimum + 1;
 144         if (addr.address_length > max_len) {
 145                 dev_printk(KERN_DEBUG, &info->bridge->dev,
 146                            "host bridge window length %#llx doesn't fit in "
 147                            "%#llx-%#llx, trimming\n",
 148                            (unsigned long long) addr.address_length,
 149                            (unsigned long long) addr.minimum,
 150                            (unsigned long long) addr.maximum);
 151                 addr.address_length = max_len;
 152         }
 153
 154         start = addr.minimum + addr.translation_offset;
 155         end = start + addr.address_length - 1;
 156
 157         res = &info->res[info->res_num];
 158         res->name = info->name;
 159         res->flags = flags;
 160         res->start = start;
 161         res->end = end;
 162         res->child = NULL;
 163         align_resource(info->bridge, res);
 164
 165         if (!pci_use_crs) {
 166                 dev_printk(KERN_DEBUG, &info->bridge->dev,
 167                            "host bridge window %pR (ignored)\n", res);
 168                 return AE_OK;
 169         }
 170
 171         conflict = insert_resource_conflict(root, res);
 172         if (conflict) {
 173                 dev_err(&info->bridge->dev,
 174                         "address space collision: host bridge window %pR "
 175                         "conflicts with %s %pR\n",
 176                         res, conflict->name, conflict);
 177         } else {
 178                 pci_bus_add_resource(info->bus, res, 0);
 179                 info->res_num++;
 180                 if (addr.translation_offset)
 181                         dev_info(&info->bridge->dev, "host bridge window %pR "
 182                                  "(PCI address [%#llx-%#llx])\n",
 183                                  res, res->start - addr.translation_offset,
 184                                  res->end - addr.translation_offset);
 185                 else
 186                         dev_info(&info->bridge->dev,
 187                                  "host bridge window %pR\n", res);
 188         }
 189         return AE_OK;
 190 }
 191
 192 static void
 193 get_current_resources(struct acpi_device *device, int busnum,
 194                         int domain, struct pci_bus *bus)
 195 {
 196         struct pci_root_info info;
 197         size_t size;
 198
 199         if (pci_use_crs)
 200                 pci_bus_remove_resources(bus);
 201
 202         info.bridge = device;
 203         info.bus = bus;
 204         info.res_num = 0;
 205         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
 206                                 &info);
 207         if (!info.res_num)
 208                 return;
 209
 210         size = sizeof(*info.res) * info.res_num;
 211         info.res = kmalloc(size, GFP_KERNEL);
 212         if (!info.res)
 213                 goto res_alloc_fail;
 214
 215         info.name = kmalloc(16, GFP_KERNEL);
 216         if (!info.name)
 217                 goto name_alloc_fail;
 218         sprintf(info.name, "PCI Bus %04x:%02x", domain, busnum);
 219
 220         info.res_num = 0;
 221         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
 222                                 &info);
 223
 224         return;
 225
 226 name_alloc_fail:
 227         kfree(info.res);
 228 res_alloc_fail:
 229         return;
 230 }
 231
 232 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
 233 {
 234         struct pci_bus *bus;
 235         struct pci_sysdata *sd;
 236         int node;
 237 #ifdef CONFIG_ACPI_NUMA
 238         int pxm;
 239 #endif
 240
 241         if (domain && !pci_domains_supported) {
 242                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 243                        "ignored (multiple domains not supported)\n",
 244                        domain, busnum);
 245                 return NULL;
 246         }
 247
 248         node = -1;
 249 #ifdef CONFIG_ACPI_NUMA
 250         pxm = acpi_get_pxm(device->handle);
 251         if (pxm >= 0)
 252                 node = pxm_to_node(pxm);
 253         if (node != -1)
 254                 set_mp_bus_to_node(busnum, node);
 255         else
 256 #endif
 257                 node = get_mp_bus_to_node(busnum);
 258
 259         if (node != -1 && !node_online(node))
 260                 node = -1;
 261
 262         /* Allocate per-root-bus (not per bus) arch-specific data.
 263          * TODO: leak; this memory is never freed.
 264          * It's arguable whether it's worth the trouble to care.
 265          */
 266         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 267         if (!sd) {
 268                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 269                        "ignored (out of memory)\n", domain, busnum);
 270                 return NULL;
 271         }
 272
 273         sd->domain = domain;
 274         sd->node = node;
 275         /*
 276          * Maybe the desired pci bus has been already scanned. In such case
 277          * it is unnecessary to scan the pci bus with the given domain,busnum.
 278          */
 279         bus = pci_find_bus(domain, busnum);
 280         if (bus) {
 281                 /*
 282                  * If the desired bus exits, the content of bus->sysdata will
 283                  * be replaced by sd.
 284                  */
 285                 memcpy(bus->sysdata, sd, sizeof(*sd));
 286                 kfree(sd);
 287         } else {
 288                 bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
 289                 if (bus) {
 290                         get_current_resources(device, busnum, domain, bus);
 291                         bus->subordinate = pci_scan_child_bus(bus);
 292                 }
 293         }
 294
 295         if (!bus)
 296                 kfree(sd);
 297
 298         if (bus && node != -1) {
 299 #ifdef CONFIG_ACPI_NUMA
 300                 if (pxm >= 0)
 301                         dev_printk(KERN_DEBUG, &bus->dev,
 302                                    "on NUMA node %d (pxm %d)\n", node, pxm);
 303 #else
 304                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 305 #endif
 306         }
 307
 308         return bus;
 309 }
 310
 311 int __init pci_acpi_init(void)
 312 {
 313         struct pci_dev *dev = NULL;
 314
 315         if (acpi_noirq)
 316                 return -ENODEV;
 317
 318         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 319         acpi_irq_penalty_init();
 320         pcibios_enable_irq = acpi_pci_irq_enable;
 321         pcibios_disable_irq = acpi_pci_irq_disable;
 322         x86_init.pci.init_irq = x86_init_noop;
 323
 324         if (pci_routeirq) {
 325                 /*
 326                  * PCI IRQ routing is set up by pci_enable_device(), but we
 327                  * also do it here in case there are still broken drivers that
 328                  * don't use pci_enable_device().
 329                  */
 330                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 331                 for_each_pci_dev(dev)
 332                         acpi_pci_irq_enable(dev);
 333         }
 334
 335         return 0;
 336 }