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;
 126         u64 start, end;
 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         start = addr.minimum + addr.translation_offset;
 144         end = start + addr.address_length - 1;
 145
 146         res = &info->res[info->res_num];
 147         res->name = info->name;
 148         res->flags = flags;
 149         res->start = start;
 150         res->end = end;
 151         res->child = NULL;
 152         align_resource(info->bridge, res);
 153
 154         if (!pci_use_crs) {
 155                 dev_printk(KERN_DEBUG, &info->bridge->dev,
 156                            "host bridge window %pR (ignored)\n", res);
 157                 return AE_OK;
 158         }
 159
 160         if (insert_resource(root, res)) {
 161                 dev_err(&info->bridge->dev,
 162                         "can't allocate host bridge window %pR\n", res);
 163         } else {
 164                 pci_bus_add_resource(info->bus, res, 0);
 165                 info->res_num++;
 166                 if (addr.translation_offset)
 167                         dev_info(&info->bridge->dev, "host bridge window %pR "
 168                                  "(PCI address [%#llx-%#llx])\n",
 169                                  res, res->start - addr.translation_offset,
 170                                  res->end - addr.translation_offset);
 171                 else
 172                         dev_info(&info->bridge->dev,
 173                                  "host bridge window %pR\n", res);
 174         }
 175         return AE_OK;
 176 }
 177
 178 static void
 179 get_current_resources(struct acpi_device *device, int busnum,
 180                         int domain, struct pci_bus *bus)
 181 {
 182         struct pci_root_info info;
 183         size_t size;
 184
 185         if (pci_use_crs)
 186                 pci_bus_remove_resources(bus);
 187
 188         info.bridge = device;
 189         info.bus = bus;
 190         info.res_num = 0;
 191         acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_resource,
 192                                 &info);
 193         if (!info.res_num)
 194                 return;
 195
 196         size = sizeof(*info.res) * info.res_num;
 197         info.res = kmalloc(size, GFP_KERNEL);
 198         if (!info.res)
 199                 goto res_alloc_fail;
 200
 201         info.name = kmalloc(16, GFP_KERNEL);
 202         if (!info.name)
 203                 goto name_alloc_fail;
 204         sprintf(info.name, "PCI Bus %04x:%02x", domain, busnum);
 205
 206         info.res_num = 0;
 207         acpi_walk_resources(device->handle, METHOD_NAME__CRS, setup_resource,
 208                                 &info);
 209
 210         return;
 211
 212 name_alloc_fail:
 213         kfree(info.res);
 214 res_alloc_fail:
 215         return;
 216 }
 217
 218 struct pci_bus * __devinit pci_acpi_scan_root(struct acpi_device *device, int domain, int busnum)
 219 {
 220         struct pci_bus *bus;
 221         struct pci_sysdata *sd;
 222         int node;
 223 #ifdef CONFIG_ACPI_NUMA
 224         int pxm;
 225 #endif
 226
 227         if (domain && !pci_domains_supported) {
 228                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 229                        "ignored (multiple domains not supported)\n",
 230                        domain, busnum);
 231                 return NULL;
 232         }
 233
 234         node = -1;
 235 #ifdef CONFIG_ACPI_NUMA
 236         pxm = acpi_get_pxm(device->handle);
 237         if (pxm >= 0)
 238                 node = pxm_to_node(pxm);
 239         if (node != -1)
 240                 set_mp_bus_to_node(busnum, node);
 241         else
 242 #endif
 243                 node = get_mp_bus_to_node(busnum);
 244
 245         if (node != -1 && !node_online(node))
 246                 node = -1;
 247
 248         /* Allocate per-root-bus (not per bus) arch-specific data.
 249          * TODO: leak; this memory is never freed.
 250          * It's arguable whether it's worth the trouble to care.
 251          */
 252         sd = kzalloc(sizeof(*sd), GFP_KERNEL);
 253         if (!sd) {
 254                 printk(KERN_WARNING "pci_bus %04x:%02x: "
 255                        "ignored (out of memory)\n", domain, busnum);
 256                 return NULL;
 257         }
 258
 259         sd->domain = domain;
 260         sd->node = node;
 261         /*
 262          * Maybe the desired pci bus has been already scanned. In such case
 263          * it is unnecessary to scan the pci bus with the given domain,busnum.
 264          */
 265         bus = pci_find_bus(domain, busnum);
 266         if (bus) {
 267                 /*
 268                  * If the desired bus exits, the content of bus->sysdata will
 269                  * be replaced by sd.
 270                  */
 271                 memcpy(bus->sysdata, sd, sizeof(*sd));
 272                 kfree(sd);
 273         } else {
 274                 bus = pci_create_bus(NULL, busnum, &pci_root_ops, sd);
 275                 if (bus) {
 276                         get_current_resources(device, busnum, domain, bus);
 277                         bus->subordinate = pci_scan_child_bus(bus);
 278                 }
 279         }
 280
 281         if (!bus)
 282                 kfree(sd);
 283
 284         if (bus && node != -1) {
 285 #ifdef CONFIG_ACPI_NUMA
 286                 if (pxm >= 0)
 287                         dev_printk(KERN_DEBUG, &bus->dev,
 288                                    "on NUMA node %d (pxm %d)\n", node, pxm);
 289 #else
 290                 dev_printk(KERN_DEBUG, &bus->dev, "on NUMA node %d\n", node);
 291 #endif
 292         }
 293
 294         return bus;
 295 }
 296
 297 int __init pci_acpi_init(void)
 298 {
 299         struct pci_dev *dev = NULL;
 300
 301         if (acpi_noirq)
 302                 return -ENODEV;
 303
 304         printk(KERN_INFO "PCI: Using ACPI for IRQ routing\n");
 305         acpi_irq_penalty_init();
 306         pcibios_enable_irq = acpi_pci_irq_enable;
 307         pcibios_disable_irq = acpi_pci_irq_disable;
 308         x86_init.pci.init_irq = x86_init_noop;
 309
 310         if (pci_routeirq) {
 311                 /*
 312                  * PCI IRQ routing is set up by pci_enable_device(), but we
 313                  * also do it here in case there are still broken drivers that
 314                  * don't use pci_enable_device().
 315                  */
 316                 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n");
 317                 for_each_pci_dev(dev)
 318                         acpi_pci_irq_enable(dev);
 319         }
 320
 321         return 0;
 322 }