Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 1 | /* |
| 2 | * PCI Stub Driver - Grabs devices in backend to be exported later |
| 3 | * |
| 4 | * Ryan Wilson <hap9@epoch.ncsc.mil> |
| 5 | * Chris Bookholt <hap10@epoch.ncsc.mil> |
| 6 | */ |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/init.h> |
| 9 | #include <linux/rwsem.h> |
| 10 | #include <linux/list.h> |
| 11 | #include <linux/spinlock.h> |
| 12 | #include <linux/kref.h> |
| 13 | #include <linux/pci.h> |
| 14 | #include <linux/wait.h> |
| 15 | #include <linux/sched.h> |
Konrad Rzeszutek Wilk | 8bfd4e0 | 2011-07-19 20:09:43 -0400 | [diff] [blame] | 16 | #include <linux/atomic.h> |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 17 | #include <xen/events.h> |
| 18 | #include <asm/xen/pci.h> |
| 19 | #include <asm/xen/hypervisor.h> |
| 20 | #include "pciback.h" |
| 21 | #include "conf_space.h" |
| 22 | #include "conf_space_quirks.h" |
| 23 | |
| 24 | static char *pci_devs_to_hide; |
| 25 | wait_queue_head_t aer_wait_queue; |
| 26 | /*Add sem for sync AER handling and pciback remove/reconfigue ops, |
| 27 | * We want to avoid in middle of AER ops, pciback devices is being removed |
| 28 | */ |
| 29 | static DECLARE_RWSEM(pcistub_sem); |
| 30 | module_param_named(hide, pci_devs_to_hide, charp, 0444); |
| 31 | |
| 32 | struct pcistub_device_id { |
| 33 | struct list_head slot_list; |
| 34 | int domain; |
| 35 | unsigned char bus; |
| 36 | unsigned int devfn; |
| 37 | }; |
| 38 | static LIST_HEAD(pcistub_device_ids); |
| 39 | static DEFINE_SPINLOCK(device_ids_lock); |
| 40 | |
| 41 | struct pcistub_device { |
| 42 | struct kref kref; |
| 43 | struct list_head dev_list; |
| 44 | spinlock_t lock; |
| 45 | |
| 46 | struct pci_dev *dev; |
| 47 | struct pciback_device *pdev;/* non-NULL if struct pci_dev is in use */ |
| 48 | }; |
| 49 | |
| 50 | /* Access to pcistub_devices & seized_devices lists and the initialize_devices |
| 51 | * flag must be locked with pcistub_devices_lock |
| 52 | */ |
| 53 | static DEFINE_SPINLOCK(pcistub_devices_lock); |
| 54 | static LIST_HEAD(pcistub_devices); |
| 55 | |
| 56 | /* wait for device_initcall before initializing our devices |
| 57 | * (see pcistub_init_devices_late) |
| 58 | */ |
| 59 | static int initialize_devices; |
| 60 | static LIST_HEAD(seized_devices); |
| 61 | |
| 62 | static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev) |
| 63 | { |
| 64 | struct pcistub_device *psdev; |
| 65 | |
| 66 | dev_dbg(&dev->dev, "pcistub_device_alloc\n"); |
| 67 | |
| 68 | psdev = kzalloc(sizeof(*psdev), GFP_ATOMIC); |
| 69 | if (!psdev) |
| 70 | return NULL; |
| 71 | |
| 72 | psdev->dev = pci_dev_get(dev); |
| 73 | if (!psdev->dev) { |
| 74 | kfree(psdev); |
| 75 | return NULL; |
| 76 | } |
| 77 | |
| 78 | kref_init(&psdev->kref); |
| 79 | spin_lock_init(&psdev->lock); |
| 80 | |
| 81 | return psdev; |
| 82 | } |
| 83 | |
| 84 | /* Don't call this directly as it's called by pcistub_device_put */ |
| 85 | static void pcistub_device_release(struct kref *kref) |
| 86 | { |
| 87 | struct pcistub_device *psdev; |
| 88 | |
| 89 | psdev = container_of(kref, struct pcistub_device, kref); |
| 90 | |
| 91 | dev_dbg(&psdev->dev->dev, "pcistub_device_release\n"); |
| 92 | |
Konrad Rzeszutek Wilk | 6221a9b | 2009-12-09 17:43:15 -0500 | [diff] [blame^] | 93 | xen_unregister_device_domain_owner(psdev->dev); |
| 94 | |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 95 | /* Clean-up the device */ |
| 96 | pciback_reset_device(psdev->dev); |
| 97 | pciback_config_free_dyn_fields(psdev->dev); |
| 98 | pciback_config_free_dev(psdev->dev); |
| 99 | kfree(pci_get_drvdata(psdev->dev)); |
| 100 | pci_set_drvdata(psdev->dev, NULL); |
| 101 | |
| 102 | pci_dev_put(psdev->dev); |
| 103 | |
| 104 | kfree(psdev); |
| 105 | } |
| 106 | |
| 107 | static inline void pcistub_device_get(struct pcistub_device *psdev) |
| 108 | { |
| 109 | kref_get(&psdev->kref); |
| 110 | } |
| 111 | |
| 112 | static inline void pcistub_device_put(struct pcistub_device *psdev) |
| 113 | { |
| 114 | kref_put(&psdev->kref, pcistub_device_release); |
| 115 | } |
| 116 | |
| 117 | static struct pcistub_device *pcistub_device_find(int domain, int bus, |
| 118 | int slot, int func) |
| 119 | { |
| 120 | struct pcistub_device *psdev = NULL; |
| 121 | unsigned long flags; |
| 122 | |
| 123 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 124 | |
| 125 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { |
| 126 | if (psdev->dev != NULL |
| 127 | && domain == pci_domain_nr(psdev->dev->bus) |
| 128 | && bus == psdev->dev->bus->number |
| 129 | && PCI_DEVFN(slot, func) == psdev->dev->devfn) { |
| 130 | pcistub_device_get(psdev); |
| 131 | goto out; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | /* didn't find it */ |
| 136 | psdev = NULL; |
| 137 | |
| 138 | out: |
| 139 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 140 | return psdev; |
| 141 | } |
| 142 | |
| 143 | static struct pci_dev *pcistub_device_get_pci_dev(struct pciback_device *pdev, |
| 144 | struct pcistub_device *psdev) |
| 145 | { |
| 146 | struct pci_dev *pci_dev = NULL; |
| 147 | unsigned long flags; |
| 148 | |
| 149 | pcistub_device_get(psdev); |
| 150 | |
| 151 | spin_lock_irqsave(&psdev->lock, flags); |
| 152 | if (!psdev->pdev) { |
| 153 | psdev->pdev = pdev; |
| 154 | pci_dev = psdev->dev; |
| 155 | } |
| 156 | spin_unlock_irqrestore(&psdev->lock, flags); |
| 157 | |
| 158 | if (!pci_dev) |
| 159 | pcistub_device_put(psdev); |
| 160 | |
| 161 | return pci_dev; |
| 162 | } |
| 163 | |
| 164 | struct pci_dev *pcistub_get_pci_dev_by_slot(struct pciback_device *pdev, |
| 165 | int domain, int bus, |
| 166 | int slot, int func) |
| 167 | { |
| 168 | struct pcistub_device *psdev; |
| 169 | struct pci_dev *found_dev = NULL; |
| 170 | unsigned long flags; |
| 171 | |
| 172 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 173 | |
| 174 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { |
| 175 | if (psdev->dev != NULL |
| 176 | && domain == pci_domain_nr(psdev->dev->bus) |
| 177 | && bus == psdev->dev->bus->number |
| 178 | && PCI_DEVFN(slot, func) == psdev->dev->devfn) { |
| 179 | found_dev = pcistub_device_get_pci_dev(pdev, psdev); |
| 180 | break; |
| 181 | } |
| 182 | } |
| 183 | |
| 184 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 185 | return found_dev; |
| 186 | } |
| 187 | |
| 188 | struct pci_dev *pcistub_get_pci_dev(struct pciback_device *pdev, |
| 189 | struct pci_dev *dev) |
| 190 | { |
| 191 | struct pcistub_device *psdev; |
| 192 | struct pci_dev *found_dev = NULL; |
| 193 | unsigned long flags; |
| 194 | |
| 195 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 196 | |
| 197 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { |
| 198 | if (psdev->dev == dev) { |
| 199 | found_dev = pcistub_device_get_pci_dev(pdev, psdev); |
| 200 | break; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 205 | return found_dev; |
| 206 | } |
| 207 | |
| 208 | void pcistub_put_pci_dev(struct pci_dev *dev) |
| 209 | { |
| 210 | struct pcistub_device *psdev, *found_psdev = NULL; |
| 211 | unsigned long flags; |
| 212 | |
| 213 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 214 | |
| 215 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { |
| 216 | if (psdev->dev == dev) { |
| 217 | found_psdev = psdev; |
| 218 | break; |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 223 | |
| 224 | /*hold this lock for avoiding breaking link between |
| 225 | * pcistub and pciback when AER is in processing |
| 226 | */ |
| 227 | down_write(&pcistub_sem); |
| 228 | /* Cleanup our device |
| 229 | * (so it's ready for the next domain) |
| 230 | */ |
| 231 | pciback_reset_device(found_psdev->dev); |
| 232 | pciback_config_free_dyn_fields(found_psdev->dev); |
| 233 | pciback_config_reset_dev(found_psdev->dev); |
| 234 | |
| 235 | spin_lock_irqsave(&found_psdev->lock, flags); |
| 236 | found_psdev->pdev = NULL; |
| 237 | spin_unlock_irqrestore(&found_psdev->lock, flags); |
| 238 | |
| 239 | pcistub_device_put(found_psdev); |
| 240 | up_write(&pcistub_sem); |
| 241 | } |
| 242 | |
| 243 | static int __devinit pcistub_match_one(struct pci_dev *dev, |
| 244 | struct pcistub_device_id *pdev_id) |
| 245 | { |
| 246 | /* Match the specified device by domain, bus, slot, func and also if |
| 247 | * any of the device's parent bridges match. |
| 248 | */ |
| 249 | for (; dev != NULL; dev = dev->bus->self) { |
| 250 | if (pci_domain_nr(dev->bus) == pdev_id->domain |
| 251 | && dev->bus->number == pdev_id->bus |
| 252 | && dev->devfn == pdev_id->devfn) |
| 253 | return 1; |
| 254 | |
| 255 | /* Sometimes topmost bridge links to itself. */ |
| 256 | if (dev == dev->bus->self) |
| 257 | break; |
| 258 | } |
| 259 | |
| 260 | return 0; |
| 261 | } |
| 262 | |
| 263 | static int __devinit pcistub_match(struct pci_dev *dev) |
| 264 | { |
| 265 | struct pcistub_device_id *pdev_id; |
| 266 | unsigned long flags; |
| 267 | int found = 0; |
| 268 | |
| 269 | spin_lock_irqsave(&device_ids_lock, flags); |
| 270 | list_for_each_entry(pdev_id, &pcistub_device_ids, slot_list) { |
| 271 | if (pcistub_match_one(dev, pdev_id)) { |
| 272 | found = 1; |
| 273 | break; |
| 274 | } |
| 275 | } |
| 276 | spin_unlock_irqrestore(&device_ids_lock, flags); |
| 277 | |
| 278 | return found; |
| 279 | } |
| 280 | |
| 281 | static int __devinit pcistub_init_device(struct pci_dev *dev) |
| 282 | { |
| 283 | struct pciback_dev_data *dev_data; |
| 284 | int err = 0; |
| 285 | |
| 286 | dev_dbg(&dev->dev, "initializing...\n"); |
| 287 | |
| 288 | /* The PCI backend is not intended to be a module (or to work with |
| 289 | * removable PCI devices (yet). If it were, pciback_config_free() |
| 290 | * would need to be called somewhere to free the memory allocated |
| 291 | * here and then to call kfree(pci_get_drvdata(psdev->dev)). |
| 292 | */ |
| 293 | dev_data = kzalloc(sizeof(*dev_data), GFP_ATOMIC); |
| 294 | if (!dev_data) { |
| 295 | err = -ENOMEM; |
| 296 | goto out; |
| 297 | } |
| 298 | pci_set_drvdata(dev, dev_data); |
| 299 | |
| 300 | dev_dbg(&dev->dev, "initializing config\n"); |
| 301 | |
| 302 | init_waitqueue_head(&aer_wait_queue); |
| 303 | err = pciback_config_init_dev(dev); |
| 304 | if (err) |
| 305 | goto out; |
| 306 | |
| 307 | /* HACK: Force device (& ACPI) to determine what IRQ it's on - we |
| 308 | * must do this here because pcibios_enable_device may specify |
| 309 | * the pci device's true irq (and possibly its other resources) |
| 310 | * if they differ from what's in the configuration space. |
| 311 | * This makes the assumption that the device's resources won't |
| 312 | * change after this point (otherwise this code may break!) |
| 313 | */ |
| 314 | dev_dbg(&dev->dev, "enabling device\n"); |
| 315 | err = pci_enable_device(dev); |
| 316 | if (err) |
| 317 | goto config_release; |
| 318 | |
| 319 | /* Now disable the device (this also ensures some private device |
| 320 | * data is setup before we export) |
| 321 | */ |
| 322 | dev_dbg(&dev->dev, "reset device\n"); |
| 323 | pciback_reset_device(dev); |
| 324 | |
| 325 | return 0; |
| 326 | |
| 327 | config_release: |
| 328 | pciback_config_free_dev(dev); |
| 329 | |
| 330 | out: |
| 331 | pci_set_drvdata(dev, NULL); |
| 332 | kfree(dev_data); |
| 333 | return err; |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * Because some initialization still happens on |
| 338 | * devices during fs_initcall, we need to defer |
| 339 | * full initialization of our devices until |
| 340 | * device_initcall. |
| 341 | */ |
| 342 | static int __init pcistub_init_devices_late(void) |
| 343 | { |
| 344 | struct pcistub_device *psdev; |
| 345 | unsigned long flags; |
| 346 | int err = 0; |
| 347 | |
| 348 | pr_debug("pciback: pcistub_init_devices_late\n"); |
| 349 | |
| 350 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 351 | |
| 352 | while (!list_empty(&seized_devices)) { |
| 353 | psdev = container_of(seized_devices.next, |
| 354 | struct pcistub_device, dev_list); |
| 355 | list_del(&psdev->dev_list); |
| 356 | |
| 357 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 358 | |
| 359 | err = pcistub_init_device(psdev->dev); |
| 360 | if (err) { |
| 361 | dev_err(&psdev->dev->dev, |
| 362 | "error %d initializing device\n", err); |
| 363 | kfree(psdev); |
| 364 | psdev = NULL; |
| 365 | } |
| 366 | |
| 367 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 368 | |
| 369 | if (psdev) |
| 370 | list_add_tail(&psdev->dev_list, &pcistub_devices); |
| 371 | } |
| 372 | |
| 373 | initialize_devices = 1; |
| 374 | |
| 375 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 376 | |
| 377 | return 0; |
| 378 | } |
| 379 | |
| 380 | static int __devinit pcistub_seize(struct pci_dev *dev) |
| 381 | { |
| 382 | struct pcistub_device *psdev; |
| 383 | unsigned long flags; |
| 384 | int err = 0; |
| 385 | |
| 386 | psdev = pcistub_device_alloc(dev); |
| 387 | if (!psdev) |
| 388 | return -ENOMEM; |
| 389 | |
| 390 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 391 | |
| 392 | if (initialize_devices) { |
| 393 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 394 | |
| 395 | /* don't want irqs disabled when calling pcistub_init_device */ |
| 396 | err = pcistub_init_device(psdev->dev); |
| 397 | |
| 398 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 399 | |
| 400 | if (!err) |
| 401 | list_add(&psdev->dev_list, &pcistub_devices); |
| 402 | } else { |
| 403 | dev_dbg(&dev->dev, "deferring initialization\n"); |
| 404 | list_add(&psdev->dev_list, &seized_devices); |
| 405 | } |
| 406 | |
| 407 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 408 | |
| 409 | if (err) |
| 410 | pcistub_device_put(psdev); |
| 411 | |
| 412 | return err; |
| 413 | } |
| 414 | |
| 415 | static int __devinit pcistub_probe(struct pci_dev *dev, |
| 416 | const struct pci_device_id *id) |
| 417 | { |
| 418 | int err = 0; |
| 419 | |
| 420 | dev_dbg(&dev->dev, "probing...\n"); |
| 421 | |
| 422 | if (pcistub_match(dev)) { |
| 423 | |
| 424 | if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL |
| 425 | && dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) { |
| 426 | dev_err(&dev->dev, "can't export pci devices that " |
| 427 | "don't have a normal (0) or bridge (1) " |
| 428 | "header type!\n"); |
| 429 | err = -ENODEV; |
| 430 | goto out; |
| 431 | } |
| 432 | |
| 433 | dev_info(&dev->dev, "seizing device\n"); |
| 434 | err = pcistub_seize(dev); |
| 435 | } else |
| 436 | /* Didn't find the device */ |
| 437 | err = -ENODEV; |
| 438 | |
| 439 | out: |
| 440 | return err; |
| 441 | } |
| 442 | |
| 443 | static void pcistub_remove(struct pci_dev *dev) |
| 444 | { |
| 445 | struct pcistub_device *psdev, *found_psdev = NULL; |
| 446 | unsigned long flags; |
| 447 | |
| 448 | dev_dbg(&dev->dev, "removing\n"); |
| 449 | |
| 450 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 451 | |
| 452 | pciback_config_quirk_release(dev); |
| 453 | |
| 454 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { |
| 455 | if (psdev->dev == dev) { |
| 456 | found_psdev = psdev; |
| 457 | break; |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 462 | |
| 463 | if (found_psdev) { |
| 464 | dev_dbg(&dev->dev, "found device to remove - in use? %p\n", |
| 465 | found_psdev->pdev); |
| 466 | |
| 467 | if (found_psdev->pdev) { |
| 468 | printk(KERN_WARNING "pciback: ****** removing device " |
| 469 | "%s while still in-use! ******\n", |
| 470 | pci_name(found_psdev->dev)); |
| 471 | printk(KERN_WARNING "pciback: ****** driver domain may " |
| 472 | "still access this device's i/o resources!\n"); |
| 473 | printk(KERN_WARNING "pciback: ****** shutdown driver " |
| 474 | "domain before binding device\n"); |
| 475 | printk(KERN_WARNING "pciback: ****** to other drivers " |
| 476 | "or domains\n"); |
| 477 | |
| 478 | pciback_release_pci_dev(found_psdev->pdev, |
| 479 | found_psdev->dev); |
| 480 | } |
| 481 | |
| 482 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 483 | list_del(&found_psdev->dev_list); |
| 484 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 485 | |
| 486 | /* the final put for releasing from the list */ |
| 487 | pcistub_device_put(found_psdev); |
| 488 | } |
| 489 | } |
| 490 | |
Konrad Rzeszutek Wilk | 8bfd4e0 | 2011-07-19 20:09:43 -0400 | [diff] [blame] | 491 | static DEFINE_PCI_DEVICE_TABLE(pcistub_ids) = { |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 492 | { |
| 493 | .vendor = PCI_ANY_ID, |
| 494 | .device = PCI_ANY_ID, |
| 495 | .subvendor = PCI_ANY_ID, |
| 496 | .subdevice = PCI_ANY_ID, |
| 497 | }, |
| 498 | {0,}, |
| 499 | }; |
| 500 | |
| 501 | #define PCI_NODENAME_MAX 40 |
| 502 | static void kill_domain_by_device(struct pcistub_device *psdev) |
| 503 | { |
| 504 | struct xenbus_transaction xbt; |
| 505 | int err; |
| 506 | char nodename[PCI_NODENAME_MAX]; |
| 507 | |
| 508 | if (!psdev) |
| 509 | dev_err(&psdev->dev->dev, |
| 510 | "device is NULL when do AER recovery/kill_domain\n"); |
| 511 | snprintf(nodename, PCI_NODENAME_MAX, "/local/domain/0/backend/pci/%d/0", |
| 512 | psdev->pdev->xdev->otherend_id); |
| 513 | nodename[strlen(nodename)] = '\0'; |
| 514 | |
| 515 | again: |
| 516 | err = xenbus_transaction_start(&xbt); |
| 517 | if (err) { |
| 518 | dev_err(&psdev->dev->dev, |
| 519 | "error %d when start xenbus transaction\n", err); |
| 520 | return; |
| 521 | } |
| 522 | /*PV AER handlers will set this flag*/ |
| 523 | xenbus_printf(xbt, nodename, "aerState" , "aerfail"); |
| 524 | err = xenbus_transaction_end(xbt, 0); |
| 525 | if (err) { |
| 526 | if (err == -EAGAIN) |
| 527 | goto again; |
| 528 | dev_err(&psdev->dev->dev, |
| 529 | "error %d when end xenbus transaction\n", err); |
| 530 | return; |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | /* For each aer recovery step error_detected, mmio_enabled, etc, front_end and |
| 535 | * backend need to have cooperation. In pciback, those steps will do similar |
| 536 | * jobs: send service request and waiting for front_end response. |
| 537 | */ |
| 538 | static pci_ers_result_t common_process(struct pcistub_device *psdev, |
| 539 | pci_channel_state_t state, int aer_cmd, pci_ers_result_t result) |
| 540 | { |
| 541 | pci_ers_result_t res = result; |
| 542 | struct xen_pcie_aer_op *aer_op; |
| 543 | int ret; |
| 544 | |
| 545 | /*with PV AER drivers*/ |
| 546 | aer_op = &(psdev->pdev->sh_info->aer_op); |
| 547 | aer_op->cmd = aer_cmd ; |
| 548 | /*useful for error_detected callback*/ |
| 549 | aer_op->err = state; |
| 550 | /*pcifront_end BDF*/ |
| 551 | ret = pciback_get_pcifront_dev(psdev->dev, psdev->pdev, |
| 552 | &aer_op->domain, &aer_op->bus, &aer_op->devfn); |
| 553 | if (!ret) { |
| 554 | dev_err(&psdev->dev->dev, |
| 555 | "pciback: failed to get pcifront device\n"); |
| 556 | return PCI_ERS_RESULT_NONE; |
| 557 | } |
| 558 | wmb(); |
| 559 | |
| 560 | dev_dbg(&psdev->dev->dev, |
| 561 | "pciback: aer_op %x dom %x bus %x devfn %x\n", |
| 562 | aer_cmd, aer_op->domain, aer_op->bus, aer_op->devfn); |
| 563 | /*local flag to mark there's aer request, pciback callback will use this |
| 564 | * flag to judge whether we need to check pci-front give aer service |
| 565 | * ack signal |
| 566 | */ |
| 567 | set_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags); |
| 568 | |
| 569 | /*It is possible that a pcifront conf_read_write ops request invokes |
| 570 | * the callback which cause the spurious execution of wake_up. |
| 571 | * Yet it is harmless and better than a spinlock here |
| 572 | */ |
| 573 | set_bit(_XEN_PCIB_active, |
| 574 | (unsigned long *)&psdev->pdev->sh_info->flags); |
| 575 | wmb(); |
| 576 | notify_remote_via_irq(psdev->pdev->evtchn_irq); |
| 577 | |
| 578 | ret = wait_event_timeout(aer_wait_queue, !(test_bit(_XEN_PCIB_active, |
| 579 | (unsigned long *)&psdev->pdev->sh_info->flags)), 300*HZ); |
| 580 | |
| 581 | if (!ret) { |
| 582 | if (test_bit(_XEN_PCIB_active, |
| 583 | (unsigned long *)&psdev->pdev->sh_info->flags)) { |
| 584 | dev_err(&psdev->dev->dev, |
| 585 | "pcifront aer process not responding!\n"); |
| 586 | clear_bit(_XEN_PCIB_active, |
| 587 | (unsigned long *)&psdev->pdev->sh_info->flags); |
| 588 | aer_op->err = PCI_ERS_RESULT_NONE; |
| 589 | return res; |
| 590 | } |
| 591 | } |
| 592 | clear_bit(_PCIB_op_pending, (unsigned long *)&psdev->pdev->flags); |
| 593 | |
| 594 | if (test_bit(_XEN_PCIF_active, |
| 595 | (unsigned long *)&psdev->pdev->sh_info->flags)) { |
| 596 | dev_dbg(&psdev->dev->dev, |
Konrad Rzeszutek Wilk | 8bfd4e0 | 2011-07-19 20:09:43 -0400 | [diff] [blame] | 597 | "schedule pci_conf service in pciback\n"); |
Konrad Rzeszutek Wilk | 30edc14 | 2009-10-13 17:22:20 -0400 | [diff] [blame] | 598 | test_and_schedule_op(psdev->pdev); |
| 599 | } |
| 600 | |
| 601 | res = (pci_ers_result_t)aer_op->err; |
| 602 | return res; |
| 603 | } |
| 604 | |
| 605 | /* |
| 606 | * pciback_slot_reset: it will send the slot_reset request to pcifront in case |
| 607 | * of the device driver could provide this service, and then wait for pcifront |
| 608 | * ack. |
| 609 | * @dev: pointer to PCI devices |
| 610 | * return value is used by aer_core do_recovery policy |
| 611 | */ |
| 612 | static pci_ers_result_t pciback_slot_reset(struct pci_dev *dev) |
| 613 | { |
| 614 | struct pcistub_device *psdev; |
| 615 | pci_ers_result_t result; |
| 616 | |
| 617 | result = PCI_ERS_RESULT_RECOVERED; |
| 618 | dev_dbg(&dev->dev, "pciback_slot_reset(bus:%x,devfn:%x)\n", |
| 619 | dev->bus->number, dev->devfn); |
| 620 | |
| 621 | down_write(&pcistub_sem); |
| 622 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), |
| 623 | dev->bus->number, |
| 624 | PCI_SLOT(dev->devfn), |
| 625 | PCI_FUNC(dev->devfn)); |
| 626 | |
| 627 | if (!psdev || !psdev->pdev) { |
| 628 | dev_err(&dev->dev, |
| 629 | "pciback device is not found/assigned\n"); |
| 630 | goto end; |
| 631 | } |
| 632 | |
| 633 | if (!psdev->pdev->sh_info) { |
| 634 | dev_err(&dev->dev, "pciback device is not connected or owned" |
| 635 | " by HVM, kill it\n"); |
| 636 | kill_domain_by_device(psdev); |
| 637 | goto release; |
| 638 | } |
| 639 | |
| 640 | if (!test_bit(_XEN_PCIB_AERHANDLER, |
| 641 | (unsigned long *)&psdev->pdev->sh_info->flags)) { |
| 642 | dev_err(&dev->dev, |
| 643 | "guest with no AER driver should have been killed\n"); |
| 644 | goto release; |
| 645 | } |
| 646 | result = common_process(psdev, 1, XEN_PCI_OP_aer_slotreset, result); |
| 647 | |
| 648 | if (result == PCI_ERS_RESULT_NONE || |
| 649 | result == PCI_ERS_RESULT_DISCONNECT) { |
| 650 | dev_dbg(&dev->dev, |
| 651 | "No AER slot_reset service or disconnected!\n"); |
| 652 | kill_domain_by_device(psdev); |
| 653 | } |
| 654 | release: |
| 655 | pcistub_device_put(psdev); |
| 656 | end: |
| 657 | up_write(&pcistub_sem); |
| 658 | return result; |
| 659 | |
| 660 | } |
| 661 | |
| 662 | |
| 663 | /*pciback_mmio_enabled: it will send the mmio_enabled request to pcifront |
| 664 | * in case of the device driver could provide this service, and then wait |
| 665 | * for pcifront ack |
| 666 | * @dev: pointer to PCI devices |
| 667 | * return value is used by aer_core do_recovery policy |
| 668 | */ |
| 669 | |
| 670 | static pci_ers_result_t pciback_mmio_enabled(struct pci_dev *dev) |
| 671 | { |
| 672 | struct pcistub_device *psdev; |
| 673 | pci_ers_result_t result; |
| 674 | |
| 675 | result = PCI_ERS_RESULT_RECOVERED; |
| 676 | dev_dbg(&dev->dev, "pciback_mmio_enabled(bus:%x,devfn:%x)\n", |
| 677 | dev->bus->number, dev->devfn); |
| 678 | |
| 679 | down_write(&pcistub_sem); |
| 680 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), |
| 681 | dev->bus->number, |
| 682 | PCI_SLOT(dev->devfn), |
| 683 | PCI_FUNC(dev->devfn)); |
| 684 | |
| 685 | if (!psdev || !psdev->pdev) { |
| 686 | dev_err(&dev->dev, |
| 687 | "pciback device is not found/assigned\n"); |
| 688 | goto end; |
| 689 | } |
| 690 | |
| 691 | if (!psdev->pdev->sh_info) { |
| 692 | dev_err(&dev->dev, "pciback device is not connected or owned" |
| 693 | " by HVM, kill it\n"); |
| 694 | kill_domain_by_device(psdev); |
| 695 | goto release; |
| 696 | } |
| 697 | |
| 698 | if (!test_bit(_XEN_PCIB_AERHANDLER, |
| 699 | (unsigned long *)&psdev->pdev->sh_info->flags)) { |
| 700 | dev_err(&dev->dev, |
| 701 | "guest with no AER driver should have been killed\n"); |
| 702 | goto release; |
| 703 | } |
| 704 | result = common_process(psdev, 1, XEN_PCI_OP_aer_mmio, result); |
| 705 | |
| 706 | if (result == PCI_ERS_RESULT_NONE || |
| 707 | result == PCI_ERS_RESULT_DISCONNECT) { |
| 708 | dev_dbg(&dev->dev, |
| 709 | "No AER mmio_enabled service or disconnected!\n"); |
| 710 | kill_domain_by_device(psdev); |
| 711 | } |
| 712 | release: |
| 713 | pcistub_device_put(psdev); |
| 714 | end: |
| 715 | up_write(&pcistub_sem); |
| 716 | return result; |
| 717 | } |
| 718 | |
| 719 | /*pciback_error_detected: it will send the error_detected request to pcifront |
| 720 | * in case of the device driver could provide this service, and then wait |
| 721 | * for pcifront ack. |
| 722 | * @dev: pointer to PCI devices |
| 723 | * @error: the current PCI connection state |
| 724 | * return value is used by aer_core do_recovery policy |
| 725 | */ |
| 726 | |
| 727 | static pci_ers_result_t pciback_error_detected(struct pci_dev *dev, |
| 728 | pci_channel_state_t error) |
| 729 | { |
| 730 | struct pcistub_device *psdev; |
| 731 | pci_ers_result_t result; |
| 732 | |
| 733 | result = PCI_ERS_RESULT_CAN_RECOVER; |
| 734 | dev_dbg(&dev->dev, "pciback_error_detected(bus:%x,devfn:%x)\n", |
| 735 | dev->bus->number, dev->devfn); |
| 736 | |
| 737 | down_write(&pcistub_sem); |
| 738 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), |
| 739 | dev->bus->number, |
| 740 | PCI_SLOT(dev->devfn), |
| 741 | PCI_FUNC(dev->devfn)); |
| 742 | |
| 743 | if (!psdev || !psdev->pdev) { |
| 744 | dev_err(&dev->dev, |
| 745 | "pciback device is not found/assigned\n"); |
| 746 | goto end; |
| 747 | } |
| 748 | |
| 749 | if (!psdev->pdev->sh_info) { |
| 750 | dev_err(&dev->dev, "pciback device is not connected or owned" |
| 751 | " by HVM, kill it\n"); |
| 752 | kill_domain_by_device(psdev); |
| 753 | goto release; |
| 754 | } |
| 755 | |
| 756 | /*Guest owns the device yet no aer handler regiested, kill guest*/ |
| 757 | if (!test_bit(_XEN_PCIB_AERHANDLER, |
| 758 | (unsigned long *)&psdev->pdev->sh_info->flags)) { |
| 759 | dev_dbg(&dev->dev, "guest may have no aer driver, kill it\n"); |
| 760 | kill_domain_by_device(psdev); |
| 761 | goto release; |
| 762 | } |
| 763 | result = common_process(psdev, error, XEN_PCI_OP_aer_detected, result); |
| 764 | |
| 765 | if (result == PCI_ERS_RESULT_NONE || |
| 766 | result == PCI_ERS_RESULT_DISCONNECT) { |
| 767 | dev_dbg(&dev->dev, |
| 768 | "No AER error_detected service or disconnected!\n"); |
| 769 | kill_domain_by_device(psdev); |
| 770 | } |
| 771 | release: |
| 772 | pcistub_device_put(psdev); |
| 773 | end: |
| 774 | up_write(&pcistub_sem); |
| 775 | return result; |
| 776 | } |
| 777 | |
| 778 | /*pciback_error_resume: it will send the error_resume request to pcifront |
| 779 | * in case of the device driver could provide this service, and then wait |
| 780 | * for pcifront ack. |
| 781 | * @dev: pointer to PCI devices |
| 782 | */ |
| 783 | |
| 784 | static void pciback_error_resume(struct pci_dev *dev) |
| 785 | { |
| 786 | struct pcistub_device *psdev; |
| 787 | |
| 788 | dev_dbg(&dev->dev, "pciback_error_resume(bus:%x,devfn:%x)\n", |
| 789 | dev->bus->number, dev->devfn); |
| 790 | |
| 791 | down_write(&pcistub_sem); |
| 792 | psdev = pcistub_device_find(pci_domain_nr(dev->bus), |
| 793 | dev->bus->number, |
| 794 | PCI_SLOT(dev->devfn), |
| 795 | PCI_FUNC(dev->devfn)); |
| 796 | |
| 797 | if (!psdev || !psdev->pdev) { |
| 798 | dev_err(&dev->dev, |
| 799 | "pciback device is not found/assigned\n"); |
| 800 | goto end; |
| 801 | } |
| 802 | |
| 803 | if (!psdev->pdev->sh_info) { |
| 804 | dev_err(&dev->dev, "pciback device is not connected or owned" |
| 805 | " by HVM, kill it\n"); |
| 806 | kill_domain_by_device(psdev); |
| 807 | goto release; |
| 808 | } |
| 809 | |
| 810 | if (!test_bit(_XEN_PCIB_AERHANDLER, |
| 811 | (unsigned long *)&psdev->pdev->sh_info->flags)) { |
| 812 | dev_err(&dev->dev, |
| 813 | "guest with no AER driver should have been killed\n"); |
| 814 | kill_domain_by_device(psdev); |
| 815 | goto release; |
| 816 | } |
| 817 | common_process(psdev, 1, XEN_PCI_OP_aer_resume, |
| 818 | PCI_ERS_RESULT_RECOVERED); |
| 819 | release: |
| 820 | pcistub_device_put(psdev); |
| 821 | end: |
| 822 | up_write(&pcistub_sem); |
| 823 | return; |
| 824 | } |
| 825 | |
| 826 | /*add pciback AER handling*/ |
| 827 | static struct pci_error_handlers pciback_error_handler = { |
| 828 | .error_detected = pciback_error_detected, |
| 829 | .mmio_enabled = pciback_mmio_enabled, |
| 830 | .slot_reset = pciback_slot_reset, |
| 831 | .resume = pciback_error_resume, |
| 832 | }; |
| 833 | |
| 834 | /* |
| 835 | * Note: There is no MODULE_DEVICE_TABLE entry here because this isn't |
| 836 | * for a normal device. I don't want it to be loaded automatically. |
| 837 | */ |
| 838 | |
| 839 | static struct pci_driver pciback_pci_driver = { |
| 840 | .name = "pciback", |
| 841 | .id_table = pcistub_ids, |
| 842 | .probe = pcistub_probe, |
| 843 | .remove = pcistub_remove, |
| 844 | .err_handler = &pciback_error_handler, |
| 845 | }; |
| 846 | |
| 847 | static inline int str_to_slot(const char *buf, int *domain, int *bus, |
| 848 | int *slot, int *func) |
| 849 | { |
| 850 | int err; |
| 851 | |
| 852 | err = sscanf(buf, " %x:%x:%x.%x", domain, bus, slot, func); |
| 853 | if (err == 4) |
| 854 | return 0; |
| 855 | else if (err < 0) |
| 856 | return -EINVAL; |
| 857 | |
| 858 | /* try again without domain */ |
| 859 | *domain = 0; |
| 860 | err = sscanf(buf, " %x:%x.%x", bus, slot, func); |
| 861 | if (err == 3) |
| 862 | return 0; |
| 863 | |
| 864 | return -EINVAL; |
| 865 | } |
| 866 | |
| 867 | static inline int str_to_quirk(const char *buf, int *domain, int *bus, int |
| 868 | *slot, int *func, int *reg, int *size, int *mask) |
| 869 | { |
| 870 | int err; |
| 871 | |
| 872 | err = |
| 873 | sscanf(buf, " %04x:%02x:%02x.%1x-%08x:%1x:%08x", domain, bus, slot, |
| 874 | func, reg, size, mask); |
| 875 | if (err == 7) |
| 876 | return 0; |
| 877 | return -EINVAL; |
| 878 | } |
| 879 | |
| 880 | static int pcistub_device_id_add(int domain, int bus, int slot, int func) |
| 881 | { |
| 882 | struct pcistub_device_id *pci_dev_id; |
| 883 | unsigned long flags; |
| 884 | |
| 885 | pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_KERNEL); |
| 886 | if (!pci_dev_id) |
| 887 | return -ENOMEM; |
| 888 | |
| 889 | pci_dev_id->domain = domain; |
| 890 | pci_dev_id->bus = bus; |
| 891 | pci_dev_id->devfn = PCI_DEVFN(slot, func); |
| 892 | |
| 893 | pr_debug("pciback: wants to seize %04x:%02x:%02x.%01x\n", |
| 894 | domain, bus, slot, func); |
| 895 | |
| 896 | spin_lock_irqsave(&device_ids_lock, flags); |
| 897 | list_add_tail(&pci_dev_id->slot_list, &pcistub_device_ids); |
| 898 | spin_unlock_irqrestore(&device_ids_lock, flags); |
| 899 | |
| 900 | return 0; |
| 901 | } |
| 902 | |
| 903 | static int pcistub_device_id_remove(int domain, int bus, int slot, int func) |
| 904 | { |
| 905 | struct pcistub_device_id *pci_dev_id, *t; |
| 906 | int devfn = PCI_DEVFN(slot, func); |
| 907 | int err = -ENOENT; |
| 908 | unsigned long flags; |
| 909 | |
| 910 | spin_lock_irqsave(&device_ids_lock, flags); |
| 911 | list_for_each_entry_safe(pci_dev_id, t, &pcistub_device_ids, |
| 912 | slot_list) { |
| 913 | if (pci_dev_id->domain == domain |
| 914 | && pci_dev_id->bus == bus && pci_dev_id->devfn == devfn) { |
| 915 | /* Don't break; here because it's possible the same |
| 916 | * slot could be in the list more than once |
| 917 | */ |
| 918 | list_del(&pci_dev_id->slot_list); |
| 919 | kfree(pci_dev_id); |
| 920 | |
| 921 | err = 0; |
| 922 | |
| 923 | pr_debug("pciback: removed %04x:%02x:%02x.%01x from " |
| 924 | "seize list\n", domain, bus, slot, func); |
| 925 | } |
| 926 | } |
| 927 | spin_unlock_irqrestore(&device_ids_lock, flags); |
| 928 | |
| 929 | return err; |
| 930 | } |
| 931 | |
| 932 | static int pcistub_reg_add(int domain, int bus, int slot, int func, int reg, |
| 933 | int size, int mask) |
| 934 | { |
| 935 | int err = 0; |
| 936 | struct pcistub_device *psdev; |
| 937 | struct pci_dev *dev; |
| 938 | struct config_field *field; |
| 939 | |
| 940 | psdev = pcistub_device_find(domain, bus, slot, func); |
| 941 | if (!psdev || !psdev->dev) { |
| 942 | err = -ENODEV; |
| 943 | goto out; |
| 944 | } |
| 945 | dev = psdev->dev; |
| 946 | |
| 947 | field = kzalloc(sizeof(*field), GFP_ATOMIC); |
| 948 | if (!field) { |
| 949 | err = -ENOMEM; |
| 950 | goto out; |
| 951 | } |
| 952 | |
| 953 | field->offset = reg; |
| 954 | field->size = size; |
| 955 | field->mask = mask; |
| 956 | field->init = NULL; |
| 957 | field->reset = NULL; |
| 958 | field->release = NULL; |
| 959 | field->clean = pciback_config_field_free; |
| 960 | |
| 961 | err = pciback_config_quirks_add_field(dev, field); |
| 962 | if (err) |
| 963 | kfree(field); |
| 964 | out: |
| 965 | return err; |
| 966 | } |
| 967 | |
| 968 | static ssize_t pcistub_slot_add(struct device_driver *drv, const char *buf, |
| 969 | size_t count) |
| 970 | { |
| 971 | int domain, bus, slot, func; |
| 972 | int err; |
| 973 | |
| 974 | err = str_to_slot(buf, &domain, &bus, &slot, &func); |
| 975 | if (err) |
| 976 | goto out; |
| 977 | |
| 978 | err = pcistub_device_id_add(domain, bus, slot, func); |
| 979 | |
| 980 | out: |
| 981 | if (!err) |
| 982 | err = count; |
| 983 | return err; |
| 984 | } |
| 985 | |
| 986 | DRIVER_ATTR(new_slot, S_IWUSR, NULL, pcistub_slot_add); |
| 987 | |
| 988 | static ssize_t pcistub_slot_remove(struct device_driver *drv, const char *buf, |
| 989 | size_t count) |
| 990 | { |
| 991 | int domain, bus, slot, func; |
| 992 | int err; |
| 993 | |
| 994 | err = str_to_slot(buf, &domain, &bus, &slot, &func); |
| 995 | if (err) |
| 996 | goto out; |
| 997 | |
| 998 | err = pcistub_device_id_remove(domain, bus, slot, func); |
| 999 | |
| 1000 | out: |
| 1001 | if (!err) |
| 1002 | err = count; |
| 1003 | return err; |
| 1004 | } |
| 1005 | |
| 1006 | DRIVER_ATTR(remove_slot, S_IWUSR, NULL, pcistub_slot_remove); |
| 1007 | |
| 1008 | static ssize_t pcistub_slot_show(struct device_driver *drv, char *buf) |
| 1009 | { |
| 1010 | struct pcistub_device_id *pci_dev_id; |
| 1011 | size_t count = 0; |
| 1012 | unsigned long flags; |
| 1013 | |
| 1014 | spin_lock_irqsave(&device_ids_lock, flags); |
| 1015 | list_for_each_entry(pci_dev_id, &pcistub_device_ids, slot_list) { |
| 1016 | if (count >= PAGE_SIZE) |
| 1017 | break; |
| 1018 | |
| 1019 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 1020 | "%04x:%02x:%02x.%01x\n", |
| 1021 | pci_dev_id->domain, pci_dev_id->bus, |
| 1022 | PCI_SLOT(pci_dev_id->devfn), |
| 1023 | PCI_FUNC(pci_dev_id->devfn)); |
| 1024 | } |
| 1025 | spin_unlock_irqrestore(&device_ids_lock, flags); |
| 1026 | |
| 1027 | return count; |
| 1028 | } |
| 1029 | |
| 1030 | DRIVER_ATTR(slots, S_IRUSR, pcistub_slot_show, NULL); |
| 1031 | |
| 1032 | static ssize_t pcistub_quirk_add(struct device_driver *drv, const char *buf, |
| 1033 | size_t count) |
| 1034 | { |
| 1035 | int domain, bus, slot, func, reg, size, mask; |
| 1036 | int err; |
| 1037 | |
| 1038 | err = str_to_quirk(buf, &domain, &bus, &slot, &func, ®, &size, |
| 1039 | &mask); |
| 1040 | if (err) |
| 1041 | goto out; |
| 1042 | |
| 1043 | err = pcistub_reg_add(domain, bus, slot, func, reg, size, mask); |
| 1044 | |
| 1045 | out: |
| 1046 | if (!err) |
| 1047 | err = count; |
| 1048 | return err; |
| 1049 | } |
| 1050 | |
| 1051 | static ssize_t pcistub_quirk_show(struct device_driver *drv, char *buf) |
| 1052 | { |
| 1053 | int count = 0; |
| 1054 | unsigned long flags; |
| 1055 | struct pciback_config_quirk *quirk; |
| 1056 | struct pciback_dev_data *dev_data; |
| 1057 | const struct config_field *field; |
| 1058 | const struct config_field_entry *cfg_entry; |
| 1059 | |
| 1060 | spin_lock_irqsave(&device_ids_lock, flags); |
| 1061 | list_for_each_entry(quirk, &pciback_quirks, quirks_list) { |
| 1062 | if (count >= PAGE_SIZE) |
| 1063 | goto out; |
| 1064 | |
| 1065 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 1066 | "%02x:%02x.%01x\n\t%04x:%04x:%04x:%04x\n", |
| 1067 | quirk->pdev->bus->number, |
| 1068 | PCI_SLOT(quirk->pdev->devfn), |
| 1069 | PCI_FUNC(quirk->pdev->devfn), |
| 1070 | quirk->devid.vendor, quirk->devid.device, |
| 1071 | quirk->devid.subvendor, |
| 1072 | quirk->devid.subdevice); |
| 1073 | |
| 1074 | dev_data = pci_get_drvdata(quirk->pdev); |
| 1075 | |
| 1076 | list_for_each_entry(cfg_entry, &dev_data->config_fields, list) { |
| 1077 | field = cfg_entry->field; |
| 1078 | if (count >= PAGE_SIZE) |
| 1079 | goto out; |
| 1080 | |
| 1081 | count += scnprintf(buf + count, PAGE_SIZE - count, |
| 1082 | "\t\t%08x:%01x:%08x\n", |
| 1083 | cfg_entry->base_offset + |
| 1084 | field->offset, field->size, |
| 1085 | field->mask); |
| 1086 | } |
| 1087 | } |
| 1088 | |
| 1089 | out: |
| 1090 | spin_unlock_irqrestore(&device_ids_lock, flags); |
| 1091 | |
| 1092 | return count; |
| 1093 | } |
| 1094 | |
| 1095 | DRIVER_ATTR(quirks, S_IRUSR | S_IWUSR, pcistub_quirk_show, pcistub_quirk_add); |
| 1096 | |
| 1097 | static ssize_t permissive_add(struct device_driver *drv, const char *buf, |
| 1098 | size_t count) |
| 1099 | { |
| 1100 | int domain, bus, slot, func; |
| 1101 | int err; |
| 1102 | struct pcistub_device *psdev; |
| 1103 | struct pciback_dev_data *dev_data; |
| 1104 | err = str_to_slot(buf, &domain, &bus, &slot, &func); |
| 1105 | if (err) |
| 1106 | goto out; |
| 1107 | psdev = pcistub_device_find(domain, bus, slot, func); |
| 1108 | if (!psdev) { |
| 1109 | err = -ENODEV; |
| 1110 | goto out; |
| 1111 | } |
| 1112 | if (!psdev->dev) { |
| 1113 | err = -ENODEV; |
| 1114 | goto release; |
| 1115 | } |
| 1116 | dev_data = pci_get_drvdata(psdev->dev); |
| 1117 | /* the driver data for a device should never be null at this point */ |
| 1118 | if (!dev_data) { |
| 1119 | err = -ENXIO; |
| 1120 | goto release; |
| 1121 | } |
| 1122 | if (!dev_data->permissive) { |
| 1123 | dev_data->permissive = 1; |
| 1124 | /* Let user know that what they're doing could be unsafe */ |
| 1125 | dev_warn(&psdev->dev->dev, "enabling permissive mode " |
| 1126 | "configuration space accesses!\n"); |
| 1127 | dev_warn(&psdev->dev->dev, |
| 1128 | "permissive mode is potentially unsafe!\n"); |
| 1129 | } |
| 1130 | release: |
| 1131 | pcistub_device_put(psdev); |
| 1132 | out: |
| 1133 | if (!err) |
| 1134 | err = count; |
| 1135 | return err; |
| 1136 | } |
| 1137 | |
| 1138 | static ssize_t permissive_show(struct device_driver *drv, char *buf) |
| 1139 | { |
| 1140 | struct pcistub_device *psdev; |
| 1141 | struct pciback_dev_data *dev_data; |
| 1142 | size_t count = 0; |
| 1143 | unsigned long flags; |
| 1144 | spin_lock_irqsave(&pcistub_devices_lock, flags); |
| 1145 | list_for_each_entry(psdev, &pcistub_devices, dev_list) { |
| 1146 | if (count >= PAGE_SIZE) |
| 1147 | break; |
| 1148 | if (!psdev->dev) |
| 1149 | continue; |
| 1150 | dev_data = pci_get_drvdata(psdev->dev); |
| 1151 | if (!dev_data || !dev_data->permissive) |
| 1152 | continue; |
| 1153 | count += |
| 1154 | scnprintf(buf + count, PAGE_SIZE - count, "%s\n", |
| 1155 | pci_name(psdev->dev)); |
| 1156 | } |
| 1157 | spin_unlock_irqrestore(&pcistub_devices_lock, flags); |
| 1158 | return count; |
| 1159 | } |
| 1160 | |
| 1161 | DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show, permissive_add); |
| 1162 | |
| 1163 | static void pcistub_exit(void) |
| 1164 | { |
| 1165 | driver_remove_file(&pciback_pci_driver.driver, &driver_attr_new_slot); |
| 1166 | driver_remove_file(&pciback_pci_driver.driver, |
| 1167 | &driver_attr_remove_slot); |
| 1168 | driver_remove_file(&pciback_pci_driver.driver, &driver_attr_slots); |
| 1169 | driver_remove_file(&pciback_pci_driver.driver, &driver_attr_quirks); |
| 1170 | driver_remove_file(&pciback_pci_driver.driver, &driver_attr_permissive); |
| 1171 | |
| 1172 | pci_unregister_driver(&pciback_pci_driver); |
| 1173 | } |
| 1174 | |
| 1175 | static int __init pcistub_init(void) |
| 1176 | { |
| 1177 | int pos = 0; |
| 1178 | int err = 0; |
| 1179 | int domain, bus, slot, func; |
| 1180 | int parsed; |
| 1181 | |
| 1182 | if (pci_devs_to_hide && *pci_devs_to_hide) { |
| 1183 | do { |
| 1184 | parsed = 0; |
| 1185 | |
| 1186 | err = sscanf(pci_devs_to_hide + pos, |
| 1187 | " (%x:%x:%x.%x) %n", |
| 1188 | &domain, &bus, &slot, &func, &parsed); |
| 1189 | if (err != 4) { |
| 1190 | domain = 0; |
| 1191 | err = sscanf(pci_devs_to_hide + pos, |
| 1192 | " (%x:%x.%x) %n", |
| 1193 | &bus, &slot, &func, &parsed); |
| 1194 | if (err != 3) |
| 1195 | goto parse_error; |
| 1196 | } |
| 1197 | |
| 1198 | err = pcistub_device_id_add(domain, bus, slot, func); |
| 1199 | if (err) |
| 1200 | goto out; |
| 1201 | |
| 1202 | /* if parsed<=0, we've reached the end of the string */ |
| 1203 | pos += parsed; |
| 1204 | } while (parsed > 0 && pci_devs_to_hide[pos]); |
| 1205 | } |
| 1206 | |
| 1207 | /* If we're the first PCI Device Driver to register, we're the |
| 1208 | * first one to get offered PCI devices as they become |
| 1209 | * available (and thus we can be the first to grab them) |
| 1210 | */ |
| 1211 | err = pci_register_driver(&pciback_pci_driver); |
| 1212 | if (err < 0) |
| 1213 | goto out; |
| 1214 | |
| 1215 | err = driver_create_file(&pciback_pci_driver.driver, |
| 1216 | &driver_attr_new_slot); |
| 1217 | if (!err) |
| 1218 | err = driver_create_file(&pciback_pci_driver.driver, |
| 1219 | &driver_attr_remove_slot); |
| 1220 | if (!err) |
| 1221 | err = driver_create_file(&pciback_pci_driver.driver, |
| 1222 | &driver_attr_slots); |
| 1223 | if (!err) |
| 1224 | err = driver_create_file(&pciback_pci_driver.driver, |
| 1225 | &driver_attr_quirks); |
| 1226 | if (!err) |
| 1227 | err = driver_create_file(&pciback_pci_driver.driver, |
| 1228 | &driver_attr_permissive); |
| 1229 | |
| 1230 | if (err) |
| 1231 | pcistub_exit(); |
| 1232 | |
| 1233 | out: |
| 1234 | return err; |
| 1235 | |
| 1236 | parse_error: |
| 1237 | printk(KERN_ERR "pciback: Error parsing pci_devs_to_hide at \"%s\"\n", |
| 1238 | pci_devs_to_hide + pos); |
| 1239 | return -EINVAL; |
| 1240 | } |
| 1241 | |
| 1242 | #ifndef MODULE |
| 1243 | /* |
| 1244 | * fs_initcall happens before device_initcall |
| 1245 | * so pciback *should* get called first (b/c we |
| 1246 | * want to suck up any device before other drivers |
| 1247 | * get a chance by being the first pci device |
| 1248 | * driver to register) |
| 1249 | */ |
| 1250 | fs_initcall(pcistub_init); |
| 1251 | #endif |
| 1252 | |
| 1253 | static int __init pciback_init(void) |
| 1254 | { |
| 1255 | int err; |
| 1256 | |
| 1257 | if (!xen_initial_domain()) |
| 1258 | return -ENODEV; |
| 1259 | |
| 1260 | err = pciback_config_init(); |
| 1261 | if (err) |
| 1262 | return err; |
| 1263 | |
| 1264 | #ifdef MODULE |
| 1265 | err = pcistub_init(); |
| 1266 | if (err < 0) |
| 1267 | return err; |
| 1268 | #endif |
| 1269 | |
| 1270 | pcistub_init_devices_late(); |
| 1271 | err = pciback_xenbus_register(); |
| 1272 | if (err) |
| 1273 | pcistub_exit(); |
| 1274 | |
| 1275 | return err; |
| 1276 | } |
| 1277 | |
| 1278 | static void __exit pciback_cleanup(void) |
| 1279 | { |
| 1280 | pciback_xenbus_unregister(); |
| 1281 | pcistub_exit(); |
| 1282 | } |
| 1283 | |
| 1284 | module_init(pciback_init); |
| 1285 | module_exit(pciback_cleanup); |
| 1286 | |
| 1287 | MODULE_LICENSE("Dual BSD/GPL"); |