drivers/pci/pci-sysfs.c

   1 /*
   2  * drivers/pci/pci-sysfs.c
   3  *
   4  * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
   5  * (C) Copyright 2002-2004 IBM Corp.
   6  * (C) Copyright 2003 Matthew Wilcox
   7  * (C) Copyright 2003 Hewlett-Packard
   8  * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
   9  * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
  10  *
  11  * File attributes for PCI devices
  12  *
  13  * Modeled after usb's driverfs.c
  14  *
  15  */
  16
  17
  18 #include <linux/config.h>
  19 #include <linux/kernel.h>
  20 #include <linux/pci.h>
  21 #include <linux/stat.h>
  22 #include <linux/topology.h>
  23 #include <linux/mm.h>
  24
  25 #include "pci.h"
  26
  27 static int sysfs_initialized;   /* = 0 */
  28
  29 /* show configuration fields */
  30 #define pci_config_attr(field, format_string)                           \
  31 static ssize_t                                                          \
  32 field##_show(struct device *dev, char *buf)                             \
  33 {                                                                       \
  34         struct pci_dev *pdev;                                           \
  35                                                                         \
  36         pdev = to_pci_dev (dev);                                        \
  37         return sprintf (buf, format_string, pdev->field);               \
  38 }
  39
  40 pci_config_attr(vendor, "0x%04x\n");
  41 pci_config_attr(device, "0x%04x\n");
  42 pci_config_attr(subsystem_vendor, "0x%04x\n");
  43 pci_config_attr(subsystem_device, "0x%04x\n");
  44 pci_config_attr(class, "0x%06x\n");
  45 pci_config_attr(irq, "%u\n");
  46
  47 static ssize_t local_cpus_show(struct device *dev, char *buf)
  48 {
  49         cpumask_t mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
  50         int len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
  51         strcat(buf,"\n");
  52         return 1+len;
  53 }
  54
  55 /* show resources */
  56 static ssize_t
  57 resource_show(struct device * dev, char * buf)
  58 {
  59         struct pci_dev * pci_dev = to_pci_dev(dev);
  60         char * str = buf;
  61         int i;
  62         int max = 7;
  63
  64         if (pci_dev->subordinate)
  65                 max = DEVICE_COUNT_RESOURCE;
  66
  67         for (i = 0; i < max; i++) {
  68                 str += sprintf(str,"0x%016lx 0x%016lx 0x%016lx\n",
  69                                pci_resource_start(pci_dev,i),
  70                                pci_resource_end(pci_dev,i),
  71                                pci_resource_flags(pci_dev,i));
  72         }
  73         return (str - buf);
  74 }
  75
  76 struct device_attribute pci_dev_attrs[] = {
  77         __ATTR_RO(resource),
  78         __ATTR_RO(vendor),
  79         __ATTR_RO(device),
  80         __ATTR_RO(subsystem_vendor),
  81         __ATTR_RO(subsystem_device),
  82         __ATTR_RO(class),
  83         __ATTR_RO(irq),
  84         __ATTR_RO(local_cpus),
  85         __ATTR_NULL,
  86 };
  87
  88 static ssize_t
  89 pci_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
  90 {
  91         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
  92         unsigned int size = 64;
  93         loff_t init_off = off;
  94
  95         /* Several chips lock up trying to read undefined config space */
  96         if (capable(CAP_SYS_ADMIN)) {
  97                 size = dev->cfg_size;
  98         } else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
  99                 size = 128;
 100         }
 101
 102         if (off > size)
 103                 return 0;
 104         if (off + count > size) {
 105                 size -= off;
 106                 count = size;
 107         } else {
 108                 size = count;
 109         }
 110
 111         while (off & 3) {
 112                 unsigned char val;
 113                 pci_read_config_byte(dev, off, &val);
 114                 buf[off - init_off] = val;
 115                 off++;
 116                 if (--size == 0)
 117                         break;
 118         }
 119
 120         while (size > 3) {
 121                 unsigned int val;
 122                 pci_read_config_dword(dev, off, &val);
 123                 buf[off - init_off] = val & 0xff;
 124                 buf[off - init_off + 1] = (val >> 8) & 0xff;
 125                 buf[off - init_off + 2] = (val >> 16) & 0xff;
 126                 buf[off - init_off + 3] = (val >> 24) & 0xff;
 127                 off += 4;
 128                 size -= 4;
 129         }
 130
 131         while (size > 0) {
 132                 unsigned char val;
 133                 pci_read_config_byte(dev, off, &val);
 134                 buf[off - init_off] = val;
 135                 off++;
 136                 --size;
 137         }
 138
 139         return count;
 140 }
 141
 142 static ssize_t
 143 pci_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
 144 {
 145         struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 146         unsigned int size = count;
 147         loff_t init_off = off;
 148
 149         if (off > dev->cfg_size)
 150                 return 0;
 151         if (off + count > dev->cfg_size) {
 152                 size = dev->cfg_size - off;
 153                 count = size;
 154         }
 155
 156         while (off & 3) {
 157                 pci_write_config_byte(dev, off, buf[off - init_off]);
 158                 off++;
 159                 if (--size == 0)
 160                         break;
 161         }
 162
 163         while (size > 3) {
 164                 unsigned int val = buf[off - init_off];
 165                 val |= (unsigned int) buf[off - init_off + 1] << 8;
 166                 val |= (unsigned int) buf[off - init_off + 2] << 16;
 167                 val |= (unsigned int) buf[off - init_off + 3] << 24;
 168                 pci_write_config_dword(dev, off, val);
 169                 off += 4;
 170                 size -= 4;
 171         }
 172
 173         while (size > 0) {
 174                 pci_write_config_byte(dev, off, buf[off - init_off]);
 175                 off++;
 176                 --size;
 177         }
 178
 179         return count;
 180 }
 181
 182 #ifdef HAVE_PCI_LEGACY
 183 /**
 184  * pci_read_legacy_io - read byte(s) from legacy I/O port space
 185  * @kobj: kobject corresponding to file to read from
 186  * @buf: buffer to store results
 187  * @off: offset into legacy I/O port space
 188  * @count: number of bytes to read
 189  *
 190  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 191  * callback routine (pci_legacy_read).
 192  */
 193 ssize_t
 194 pci_read_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
 195 {
 196         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 197                                                       struct class_device,
 198                                                       kobj));
 199
 200         /* Only support 1, 2 or 4 byte accesses */
 201         if (count != 1 && count != 2 && count != 4)
 202                 return -EINVAL;
 203
 204         return pci_legacy_read(bus, off, (u32 *)buf, count);
 205 }
 206
 207 /**
 208  * pci_write_legacy_io - write byte(s) to legacy I/O port space
 209  * @kobj: kobject corresponding to file to read from
 210  * @buf: buffer containing value to be written
 211  * @off: offset into legacy I/O port space
 212  * @count: number of bytes to write
 213  *
 214  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
 215  * callback routine (pci_legacy_write).
 216  */
 217 ssize_t
 218 pci_write_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
 219 {
 220         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 221                                                       struct class_device,
 222                                                       kobj));
 223         /* Only support 1, 2 or 4 byte accesses */
 224         if (count != 1 && count != 2 && count != 4)
 225                 return -EINVAL;
 226
 227         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 228 }
 229
 230 /**
 231  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
 232  * @kobj: kobject corresponding to device to be mapped
 233  * @attr: struct bin_attribute for this file
 234  * @vma: struct vm_area_struct passed to mmap
 235  *
 236  * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
 237  * legacy memory space (first meg of bus space) into application virtual
 238  * memory space.
 239  */
 240 int
 241 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
 242                     struct vm_area_struct *vma)
 243 {
 244         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 245                                                       struct class_device,
 246                                                       kobj));
 247
 248         return pci_mmap_legacy_page_range(bus, vma);
 249 }
 250 #endif /* HAVE_PCI_LEGACY */
 251
 252 #ifdef HAVE_PCI_MMAP
 253 /**
 254  * pci_mmap_resource - map a PCI resource into user memory space
 255  * @kobj: kobject for mapping
 256  * @attr: struct bin_attribute for the file being mapped
 257  * @vma: struct vm_area_struct passed into the mmap
 258  *
 259  * Use the regular PCI mapping routines to map a PCI resource into userspace.
 260  * FIXME: write combining?  maybe automatic for prefetchable regions?
 261  */
 262 static int
 263 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 264                   struct vm_area_struct *vma)
 265 {
 266         struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 267                                                        struct device, kobj));
 268         struct resource *res = (struct resource *)attr->private;
 269         enum pci_mmap_state mmap_type;
 270
 271         vma->vm_pgoff += res->start >> PAGE_SHIFT;
 272         mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;
 273
 274         return pci_mmap_page_range(pdev, vma, mmap_type, 0);
 275 }
 276
 277 /**
 278  * pci_create_resource_files - create resource files in sysfs for @dev
 279  * @dev: dev in question
 280  *
 281  * Walk the resources in @dev creating files for each resource available.
 282  */
 283 static void
 284 pci_create_resource_files(struct pci_dev *pdev)
 285 {
 286         int i;
 287
 288         /* Expose the PCI resources from this device as files */
 289         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 290                 struct bin_attribute *res_attr;
 291
 292                 /* skip empty resources */
 293                 if (!pci_resource_len(pdev, i))
 294                         continue;
 295
 296                 res_attr = kmalloc(sizeof(*res_attr) + 10, GFP_ATOMIC);
 297                 if (res_attr) {
 298                         memset(res_attr, 0, sizeof(*res_attr) + 10);
 299                         pdev->res_attr[i] = res_attr;
 300                         /* Allocated above after the res_attr struct */
 301                         res_attr->attr.name = (char *)(res_attr + 1);
 302                         sprintf(res_attr->attr.name, "resource%d", i);
 303                         res_attr->size = pci_resource_len(pdev, i);
 304                         res_attr->attr.mode = S_IRUSR | S_IWUSR;
 305                         res_attr->attr.owner = THIS_MODULE;
 306                         res_attr->mmap = pci_mmap_resource;
 307                         res_attr->private = &pdev->resource[i];
 308                         sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 309                 }
 310         }
 311 }
 312
 313 /**
 314  * pci_remove_resource_files - cleanup resource files
 315  * @dev: dev to cleanup
 316  *
 317  * If we created resource files for @dev, remove them from sysfs and
 318  * free their resources.
 319  */
 320 static void
 321 pci_remove_resource_files(struct pci_dev *pdev)
 322 {
 323         int i;
 324
 325         for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 326                 struct bin_attribute *res_attr;
 327
 328                 res_attr = pdev->res_attr[i];
 329                 if (res_attr) {
 330                         sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 331                         kfree(res_attr);
 332                 }
 333         }
 334 }
 335 #else /* !HAVE_PCI_MMAP */
 336 static inline void pci_create_resource_files(struct pci_dev *dev) { return; }
 337 static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
 338 #endif /* HAVE_PCI_MMAP */
 339
 340 /**
 341  * pci_write_rom - used to enable access to the PCI ROM display
 342  * @kobj: kernel object handle
 343  * @buf: user input
 344  * @off: file offset
 345  * @count: number of byte in input
 346  *
 347  * writing anything except 0 enables it
 348  */
 349 static ssize_t
 350 pci_write_rom(struct kobject *kobj, char *buf, loff_t off, size_t count)
 351 {
 352         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 353
 354         if ((off ==  0) && (*buf == '0') && (count == 2))
 355                 pdev->rom_attr_enabled = 0;
 356         else
 357                 pdev->rom_attr_enabled = 1;
 358
 359         return count;
 360 }
 361
 362 /**
 363  * pci_read_rom - read a PCI ROM
 364  * @kobj: kernel object handle
 365  * @buf: where to put the data we read from the ROM
 366  * @off: file offset
 367  * @count: number of bytes to read
 368  *
 369  * Put @count bytes starting at @off into @buf from the ROM in the PCI
 370  * device corresponding to @kobj.
 371  */
 372 static ssize_t
 373 pci_read_rom(struct kobject *kobj, char *buf, loff_t off, size_t count)
 374 {
 375         struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 376         void __iomem *rom;
 377         size_t size;
 378
 379         if (!pdev->rom_attr_enabled)
 380                 return -EINVAL;
 381
 382         rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
 383         if (!rom)
 384                 return 0;
 385
 386         if (off >= size)
 387                 count = 0;
 388         else {
 389                 if (off + count > size)
 390                         count = size - off;
 391
 392                 memcpy_fromio(buf, rom + off, count);
 393         }
 394         pci_unmap_rom(pdev, rom);
 395
 396         return count;
 397 }
 398
 399 static struct bin_attribute pci_config_attr = {
 400         .attr = {
 401                 .name = "config",
 402                 .mode = S_IRUGO | S_IWUSR,
 403                 .owner = THIS_MODULE,
 404         },
 405         .size = 256,
 406         .read = pci_read_config,
 407         .write = pci_write_config,
 408 };
 409
 410 static struct bin_attribute pcie_config_attr = {
 411         .attr = {
 412                 .name = "config",
 413                 .mode = S_IRUGO | S_IWUSR,
 414                 .owner = THIS_MODULE,
 415         },
 416         .size = 4096,
 417         .read = pci_read_config,
 418         .write = pci_write_config,
 419 };
 420
 421 int pci_create_sysfs_dev_files (struct pci_dev *pdev)
 422 {
 423         if (!sysfs_initialized)
 424                 return -EACCES;
 425
 426         if (pdev->cfg_size < 4096)
 427                 sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
 428         else
 429                 sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 430
 431         pci_create_resource_files(pdev);
 432
 433         /* If the device has a ROM, try to expose it in sysfs. */
 434         if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
 435                 struct bin_attribute *rom_attr;
 436
 437                 rom_attr = kmalloc(sizeof(*rom_attr), GFP_ATOMIC);
 438                 if (rom_attr) {
 439                         memset(rom_attr, 0x00, sizeof(*rom_attr));
 440                         pdev->rom_attr = rom_attr;
 441                         rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
 442                         rom_attr->attr.name = "rom";
 443                         rom_attr->attr.mode = S_IRUSR;
 444                         rom_attr->attr.owner = THIS_MODULE;
 445                         rom_attr->read = pci_read_rom;
 446                         rom_attr->write = pci_write_rom;
 447                         sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);
 448                 }
 449         }
 450         /* add platform-specific attributes */
 451         pcibios_add_platform_entries(pdev);
 452
 453         return 0;
 454 }
 455
 456 /**
 457  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
 458  * @pdev: device whose entries we should free
 459  *
 460  * Cleanup when @pdev is removed from sysfs.
 461  */
 462 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
 463 {
 464         if (pdev->cfg_size < 4096)
 465                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
 466         else
 467                 sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);
 468
 469         pci_remove_resource_files(pdev);
 470
 471         if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
 472                 if (pdev->rom_attr) {
 473                         sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 474                         kfree(pdev->rom_attr);
 475                 }
 476         }
 477 }
 478
 479 static int __init pci_sysfs_init(void)
 480 {
 481         struct pci_dev *pdev = NULL;
 482
 483         sysfs_initialized = 1;
 484         for_each_pci_dev(pdev)
 485                 pci_create_sysfs_dev_files(pdev);
 486
 487         return 0;
 488 }
 489
 490 __initcall(pci_sysfs_init);