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 <asm/numa.h>
   7 #include <asm/pci_x86.h>
   8
   9 struct pci_root_info {
  10         struct acpi_device *bridge;
  11         char *name;
  12         unsigned int res_num;
  13         struct resource *res;
  14         struct pci_bus *bus;
  15         int busnum;
  16 };
  17
  18 static bool pci_use_crs = true;
  19
  20 static int __init set_use_crs(const struct dmi_system_id *id)
  21 {
  22         pci_use_crs = true;
  23         return 0;
  24 }
  25
  26 static const struct dmi_system_id pci_use_crs_table[] __initconst = {
  27         /* http://bugzilla.kernel.org/show_bug.cgi?id=14183 */
  28         {
  29                 .callback = set_use_crs,
  30                 .ident = "IBM System x3800",
  31                 .matches = {
  32                         DMI_MATCH(DMI_SYS_VENDOR, "IBM"),
  33                         DMI_MATCH(DMI_PRODUCT_NAME, "x3800"),
  34                 },
  35         },
  36         {}
  37 };
  38
  39 void __init pci_acpi_crs_quirks(void)
  40 {
  41         int year;
  42
  43         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year < 2008)
  44                 pci_use_crs = false;
  45
  46         dmi_check_system(pci_use_crs_table);
  47
  48         /*
  49          * If the user specifies "pci=use_crs" or "pci=nocrs" explicitly, that
  50          * takes precedence over anything we figured out above.
  51          */
  52         if (pci_probe & PCI_ROOT_NO_CRS)
  53                 pci_use_crs = false;
  54         else if (pci_probe & PCI_USE__CRS)
  55                 pci_use_crs = true;
  56
  57         printk(KERN_INFO "PCI: %s host bridge windows from ACPI; "
  58                "if necessary, use \"pci=%s\" and report a bug\n",
  59                pci_use_crs ? "Using" : "Ignoring",
  60                pci_use_crs ? "nocrs" : "use_crs");
  61 }
  62
  63 static acpi_status
  64 resource_to_addr(struct acpi_resource *resource,
  65                         struct acpi_resource_address64 *addr)
  66 {
  67         acpi_status status;
  68
  69         status = acpi_resource_to_address64(resource, addr);
  70         if (ACPI_SUCCESS(status) &&
  71             (addr->resource_type == ACPI_MEMORY_RANGE ||
  72             addr->resource_type == ACPI_IO_RANGE) &&
  73             addr->address_length > 0 &&
  74             addr->producer_consumer == ACPI_PRODUCER) {
  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_pci_root *root)
 233 {
 234         struct acpi_device *device = root->device;
 235         int domain = root->segment;
 236         int busnum = root->secondary.start;
 237         struct pci_bus *bus;
 238         struct pci_sysdata *sd;
 239         int node;
 240 #ifdef CONFIG_ACPI_NUMA
 241         int pxm;
 242 #endif
 243
 244         if (domain && !pci_domains_supported) {
 245                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 246                        "ignored (multiple domains not supported)\n",
 247                        domain, busnum);
 248                 return NULL;
 249         }
 250
 251         node = -1;
 252 #ifdef CONFIG_ACPI_NUMA
 253         pxm = acpi_get_pxm(device->handle);
 254         if (pxm >= 0)
 255                 node = pxm_to_node(pxm);
 256         if (node != -1)
 257                 set_mp_bus_to_node(busnum, node);
 258         else
 259 #endif
 260                 node = get_mp_bus_to_node(busnum);
 261
 262         if (node != -1 && !node_online(node))
 263                 node = -1;
 264
 265         /* Allocate per-root-bus (not per bus) arch-specific data.
 266          * TODO: leak; this memory is never freed.
 267          * It's arguable whether it's worth the trouble to care.
 268          */
 269         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 270         if (!sd) {
 271                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 272                        "ignored (out of memory)\n", domain, busnum);
 273                 return NULL;
 274         }
 275
 276         sd->domain = domain;
 277         sd->node = node;
 278         /*
 279          * Maybe the desired pci bus has been already scanned. In such case
 280          * it is unnecessary to scan the pci bus with the given domain,busnum.
 281          */
 282         bus = pci_find_bus(domain, busnum);
 283         if (bus) {
 284                 /*
 285                  * If the desired bus exits, the content of bus->sysdata will
 286                  * be replaced by sd.
 287                  */
 288                 memcpy(bus->sysdata, sd, sizeof(*sd));
 289                 kfree(sd);
 290         } else {
 291                 bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
 292                 if (bus) {
 293                         get_current_resources(device, busnum, domain, bus);
 294                         bus->subordinate = pci_scan_child_bus(bus);
 295                 }
 296         }
 297
 298         if (!bus)
 299                 kfree(sd);
 300
 301         if (bus && node != -1) {
 302 #ifdef CONFIG_ACPI_NUMA
 303                 if (pxm >= 0)
 304                         dev_printk(KERN_DEBUG, &bus->dev,
 305                                    "on NUMA node %d (pxm %d)\n", node, pxm);
 306 #else
 307                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 308 #endif
 309         }
 310
 311         return bus;
 312 }
 313
 314 int __init pci_acpi_init(void)
 315 {
 316         struct pci_dev *dev = NULL;
 317
 318         if (acpi_noirq)
 319                 return -ENODEV;
 320
 321         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 322         acpi_irq_penalty_init();
 323         pcibios_enable_irq = acpi_pci_irq_enable;
 324         pcibios_disable_irq = acpi_pci_irq_disable;
 325         x86_init.pci.init_irq = x86_init_noop;
 326
 327         if (pci_routeirq) {
 328                 /*
 329                  * PCI IRQ routing is set up by pci_enable_device(), but we
 330                  * also do it here in case there are still broken drivers that
 331                  * don't use pci_enable_device().
 332                  */
 333                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 334                 for_each_pci_dev(dev)
 335                         acpi_pci_irq_enable(dev);
 336         }
 337
 338         return 0;
 339 }