kernel/drivers/misc/vmw_vmci/vmci_guest.c

   1 /*
   2  * VMware VMCI Driver
   3  *
   4  * Copyright (C) 2012 VMware, Inc. All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation version 2 and no later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * for more details.
  14  */
  15
  16 #include <linux/vmw_vmci_defs.h>
  17 #include <linux/vmw_vmci_api.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/highmem.h>
  21 #include <linux/kernel.h>
  22 #include <linux/mm.h>
  23 #include <linux/module.h>
  24 #include <linux/sched.h>
  25 #include <linux/slab.h>
  26 #include <linux/init.h>
  27 #include <linux/pci.h>
  28 #include <linux/smp.h>
  29 #include <linux/io.h>
  30 #include <linux/vmalloc.h>
  31
  32 #include "vmci_datagram.h"
  33 #include "vmci_doorbell.h"
  34 #include "vmci_context.h"
  35 #include "vmci_driver.h"
  36 #include "vmci_event.h"
  37
  38 #define PCI_DEVICE_ID_VMWARE_VMCI       0x0740
  39
  40 #define VMCI_UTIL_NUM_RESOURCES 1
  41
  42 static bool vmci_disable_msi;
  43 module_param_named(disable_msi, vmci_disable_msi, bool, 0);
  44 MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
  45
  46 static bool vmci_disable_msix;
  47 module_param_named(disable_msix, vmci_disable_msix, bool, 0);
  48 MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
  49
  50 static u32 ctx_update_sub_id = VMCI_INVALID_ID;
  51 static u32 vm_context_id = VMCI_INVALID_ID;
  52
  53 struct vmci_guest_device {
  54         struct device *dev;     /* PCI device we are attached to */
  55         void __iomem *iobase;
  56
  57         unsigned int irq;
  58         unsigned int intr_type;
  59         bool exclusive_vectors;
  60         struct msix_entry msix_entries[VMCI_MAX_INTRS];
  61
  62         struct tasklet_struct datagram_tasklet;
  63         struct tasklet_struct bm_tasklet;
  64
  65         void *data_buffer;
  66         void *notification_bitmap;
  67         dma_addr_t notification_base;
  68 };
  69
  70 /* vmci_dev singleton device and supporting data*/
  71 struct pci_dev *vmci_pdev;
  72 static struct vmci_guest_device *vmci_dev_g;
  73 static DEFINE_SPINLOCK(vmci_dev_spinlock);
  74
  75 static atomic_t vmci_num_guest_devices = ATOMIC_INIT(0);
  76
  77 bool vmci_guest_code_active(void)
  78 {
  79         return atomic_read(&vmci_num_guest_devices) != 0;
  80 }
  81
  82 u32 vmci_get_vm_context_id(void)
  83 {
  84         if (vm_context_id == VMCI_INVALID_ID) {
  85                 struct vmci_datagram get_cid_msg;
  86                 get_cid_msg.dst =
  87                     vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
  88                                      VMCI_GET_CONTEXT_ID);
  89                 get_cid_msg.src = VMCI_ANON_SRC_HANDLE;
  90                 get_cid_msg.payload_size = 0;
  91                 vm_context_id = vmci_send_datagram(&get_cid_msg);
  92         }
  93         return vm_context_id;
  94 }
  95
  96 /*
  97  * VM to hypervisor call mechanism. We use the standard VMware naming
  98  * convention since shared code is calling this function as well.
  99  */
 100 int vmci_send_datagram(struct vmci_datagram *dg)
 101 {
 102         unsigned long flags;
 103         int result;
 104
 105         /* Check args. */
 106         if (dg == NULL)
 107                 return VMCI_ERROR_INVALID_ARGS;
 108
 109         /*
 110          * Need to acquire spinlock on the device because the datagram
 111          * data may be spread over multiple pages and the monitor may
 112          * interleave device user rpc calls from multiple
 113          * VCPUs. Acquiring the spinlock precludes that
 114          * possibility. Disabling interrupts to avoid incoming
 115          * datagrams during a "rep out" and possibly landing up in
 116          * this function.
 117          */
 118         spin_lock_irqsave(&vmci_dev_spinlock, flags);
 119
 120         if (vmci_dev_g) {
 121                 iowrite8_rep(vmci_dev_g->iobase + VMCI_DATA_OUT_ADDR,
 122                              dg, VMCI_DG_SIZE(dg));
 123                 result = ioread32(vmci_dev_g->iobase + VMCI_RESULT_LOW_ADDR);
 124         } else {
 125                 result = VMCI_ERROR_UNAVAILABLE;
 126         }
 127
 128         spin_unlock_irqrestore(&vmci_dev_spinlock, flags);
 129
 130         return result;
 131 }
 132 EXPORT_SYMBOL_GPL(vmci_send_datagram);
 133
 134 /*
 135  * Gets called with the new context id if updated or resumed.
 136  * Context id.
 137  */
 138 static void vmci_guest_cid_update(u32 sub_id,
 139                                   const struct vmci_event_data *event_data,
 140                                   void *client_data)
 141 {
 142         const struct vmci_event_payld_ctx *ev_payload =
 143                                 vmci_event_data_const_payload(event_data);
 144
 145         if (sub_id != ctx_update_sub_id) {
 146                 pr_devel("Invalid subscriber (ID=0x%x)\n", sub_id);
 147                 return;
 148         }
 149
 150         if (!event_data || ev_payload->context_id == VMCI_INVALID_ID) {
 151                 pr_devel("Invalid event data\n");
 152                 return;
 153         }
 154
 155         pr_devel("Updating context from (ID=0x%x) to (ID=0x%x) on event (type=%d)\n",
 156                  vm_context_id, ev_payload->context_id, event_data->event);
 157
 158         vm_context_id = ev_payload->context_id;
 159 }
 160
 161 /*
 162  * Verify that the host supports the hypercalls we need. If it does not,
 163  * try to find fallback hypercalls and use those instead.  Returns
 164  * true if required hypercalls (or fallback hypercalls) are
 165  * supported by the host, false otherwise.
 166  */
 167 static int vmci_check_host_caps(struct pci_dev *pdev)
 168 {
 169         bool result;
 170         struct vmci_resource_query_msg *msg;
 171         u32 msg_size = sizeof(struct vmci_resource_query_hdr) +
 172                                 VMCI_UTIL_NUM_RESOURCES * sizeof(u32);
 173         struct vmci_datagram *check_msg;
 174
 175         check_msg = kmalloc(msg_size, GFP_KERNEL);
 176         if (!check_msg) {
 177                 dev_err(&pdev->dev, "%s: Insufficient memory\n", __func__);
 178                 return -ENOMEM;
 179         }
 180
 181         check_msg->dst = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
 182                                           VMCI_RESOURCES_QUERY);
 183         check_msg->src = VMCI_ANON_SRC_HANDLE;
 184         check_msg->payload_size = msg_size - VMCI_DG_HEADERSIZE;
 185         msg = (struct vmci_resource_query_msg *)VMCI_DG_PAYLOAD(check_msg);
 186
 187         msg->num_resources = VMCI_UTIL_NUM_RESOURCES;
 188         msg->resources[0] = VMCI_GET_CONTEXT_ID;
 189
 190         /* Checks that hyper calls are supported */
 191         result = vmci_send_datagram(check_msg) == 0x01;
 192         kfree(check_msg);
 193
 194         dev_dbg(&pdev->dev, "%s: Host capability check: %s\n",
 195                 __func__, result ? "PASSED" : "FAILED");
 196
 197         /* We need the vector. There are no fallbacks. */
 198         return result ? 0 : -ENXIO;
 199 }
 200
 201 /*
 202  * Reads datagrams from the data in port and dispatches them. We
 203  * always start reading datagrams into only the first page of the
 204  * datagram buffer. If the datagrams don't fit into one page, we
 205  * use the maximum datagram buffer size for the remainder of the
 206  * invocation. This is a simple heuristic for not penalizing
 207  * small datagrams.
 208  *
 209  * This function assumes that it has exclusive access to the data
 210  * in port for the duration of the call.
 211  */
 212 static void vmci_dispatch_dgs(unsigned long data)
 213 {
 214         struct vmci_guest_device *vmci_dev = (struct vmci_guest_device *)data;
 215         u8 *dg_in_buffer = vmci_dev->data_buffer;
 216         struct vmci_datagram *dg;
 217         size_t dg_in_buffer_size = VMCI_MAX_DG_SIZE;
 218         size_t current_dg_in_buffer_size = PAGE_SIZE;
 219         size_t remaining_bytes;
 220
 221         BUILD_BUG_ON(VMCI_MAX_DG_SIZE < PAGE_SIZE);
 222
 223         ioread8_rep(vmci_dev->iobase + VMCI_DATA_IN_ADDR,
 224                     vmci_dev->data_buffer, current_dg_in_buffer_size);
 225         dg = (struct vmci_datagram *)dg_in_buffer;
 226         remaining_bytes = current_dg_in_buffer_size;
 227
 228         while (dg->dst.resource != VMCI_INVALID_ID ||
 229                remaining_bytes > PAGE_SIZE) {
 230                 unsigned dg_in_size;
 231
 232                 /*
 233                  * When the input buffer spans multiple pages, a datagram can
 234                  * start on any page boundary in the buffer.
 235                  */
 236                 if (dg->dst.resource == VMCI_INVALID_ID) {
 237                         dg = (struct vmci_datagram *)roundup(
 238                                 (uintptr_t)dg + 1, PAGE_SIZE);
 239                         remaining_bytes =
 240                                 (size_t)(dg_in_buffer +
 241                                          current_dg_in_buffer_size -
 242                                          (u8 *)dg);
 243                         continue;
 244                 }
 245
 246                 dg_in_size = VMCI_DG_SIZE_ALIGNED(dg);
 247
 248                 if (dg_in_size <= dg_in_buffer_size) {
 249                         int result;
 250
 251                         /*
 252                          * If the remaining bytes in the datagram
 253                          * buffer doesn't contain the complete
 254                          * datagram, we first make sure we have enough
 255                          * room for it and then we read the reminder
 256                          * of the datagram and possibly any following
 257                          * datagrams.
 258                          */
 259                         if (dg_in_size > remaining_bytes) {
 260                                 if (remaining_bytes !=
 261                                     current_dg_in_buffer_size) {
 262
 263                                         /*
 264                                          * We move the partial
 265                                          * datagram to the front and
 266                                          * read the reminder of the
 267                                          * datagram and possibly
 268                                          * following calls into the
 269                                          * following bytes.
 270                                          */
 271                                         memmove(dg_in_buffer, dg_in_buffer +
 272                                                 current_dg_in_buffer_size -
 273                                                 remaining_bytes,
 274                                                 remaining_bytes);
 275                                         dg = (struct vmci_datagram *)
 276                                             dg_in_buffer;
 277                                 }
 278
 279                                 if (current_dg_in_buffer_size !=
 280                                     dg_in_buffer_size)
 281                                         current_dg_in_buffer_size =
 282                                             dg_in_buffer_size;
 283
 284                                 ioread8_rep(vmci_dev->iobase +
 285                                                 VMCI_DATA_IN_ADDR,
 286                                         vmci_dev->data_buffer +
 287                                                 remaining_bytes,
 288                                         current_dg_in_buffer_size -
 289                                                 remaining_bytes);
 290                         }
 291
 292                         /*
 293                          * We special case event datagrams from the
 294                          * hypervisor.
 295                          */
 296                         if (dg->src.context == VMCI_HYPERVISOR_CONTEXT_ID &&
 297                             dg->dst.resource == VMCI_EVENT_HANDLER) {
 298                                 result = vmci_event_dispatch(dg);
 299                         } else {
 300                                 result = vmci_datagram_invoke_guest_handler(dg);
 301                         }
 302                         if (result < VMCI_SUCCESS)
 303                                 dev_dbg(vmci_dev->dev,
 304                                         "Datagram with resource (ID=0x%x) failed (err=%d)\n",
 305                                          dg->dst.resource, result);
 306
 307                         /* On to the next datagram. */
 308                         dg = (struct vmci_datagram *)((u8 *)dg +
 309                                                       dg_in_size);
 310                 } else {
 311                         size_t bytes_to_skip;
 312
 313                         /*
 314                          * Datagram doesn't fit in datagram buffer of maximal
 315                          * size. We drop it.
 316                          */
 317                         dev_dbg(vmci_dev->dev,
 318                                 "Failed to receive datagram (size=%u bytes)\n",
 319                                  dg_in_size);
 320
 321                         bytes_to_skip = dg_in_size - remaining_bytes;
 322                         if (current_dg_in_buffer_size != dg_in_buffer_size)
 323                                 current_dg_in_buffer_size = dg_in_buffer_size;
 324
 325                         for (;;) {
 326                                 ioread8_rep(vmci_dev->iobase +
 327                                                 VMCI_DATA_IN_ADDR,
 328                                         vmci_dev->data_buffer,
 329                                         current_dg_in_buffer_size);
 330                                 if (bytes_to_skip <= current_dg_in_buffer_size)
 331                                         break;
 332
 333                                 bytes_to_skip -= current_dg_in_buffer_size;
 334                         }
 335                         dg = (struct vmci_datagram *)(dg_in_buffer +
 336                                                       bytes_to_skip);
 337                 }
 338
 339                 remaining_bytes =
 340                     (size_t) (dg_in_buffer + current_dg_in_buffer_size -
 341                               (u8 *)dg);
 342
 343                 if (remaining_bytes < VMCI_DG_HEADERSIZE) {
 344                         /* Get the next batch of datagrams. */
 345
 346                         ioread8_rep(vmci_dev->iobase + VMCI_DATA_IN_ADDR,
 347                                     vmci_dev->data_buffer,
 348                                     current_dg_in_buffer_size);
 349                         dg = (struct vmci_datagram *)dg_in_buffer;
 350                         remaining_bytes = current_dg_in_buffer_size;
 351                 }
 352         }
 353 }
 354
 355 /*
 356  * Scans the notification bitmap for raised flags, clears them
 357  * and handles the notifications.
 358  */
 359 static void vmci_process_bitmap(unsigned long data)
 360 {
 361         struct vmci_guest_device *dev = (struct vmci_guest_device *)data;
 362
 363         if (!dev->notification_bitmap) {
 364                 dev_dbg(dev->dev, "No bitmap present in %s\n", __func__);
 365                 return;
 366         }
 367
 368         vmci_dbell_scan_notification_entries(dev->notification_bitmap);
 369 }
 370
 371 /*
 372  * Enable MSI-X.  Try exclusive vectors first, then shared vectors.
 373  */
 374 static int vmci_enable_msix(struct pci_dev *pdev,
 375                             struct vmci_guest_device *vmci_dev)
 376 {
 377         int i;
 378         int result;
 379
 380         for (i = 0; i < VMCI_MAX_INTRS; ++i) {
 381                 vmci_dev->msix_entries[i].entry = i;
 382                 vmci_dev->msix_entries[i].vector = i;
 383         }
 384
 385         result = pci_enable_msix_exact(pdev,
 386                                        vmci_dev->msix_entries, VMCI_MAX_INTRS);
 387         if (result == 0)
 388                 vmci_dev->exclusive_vectors = true;
 389         else if (result == -ENOSPC)
 390                 result = pci_enable_msix_exact(pdev, vmci_dev->msix_entries, 1);
 391
 392         return result;
 393 }
 394
 395 /*
 396  * Interrupt handler for legacy or MSI interrupt, or for first MSI-X
 397  * interrupt (vector VMCI_INTR_DATAGRAM).
 398  */
 399 static irqreturn_t vmci_interrupt(int irq, void *_dev)
 400 {
 401         struct vmci_guest_device *dev = _dev;
 402
 403         /*
 404          * If we are using MSI-X with exclusive vectors then we simply schedule
 405          * the datagram tasklet, since we know the interrupt was meant for us.
 406          * Otherwise we must read the ICR to determine what to do.
 407          */
 408
 409         if (dev->intr_type == VMCI_INTR_TYPE_MSIX && dev->exclusive_vectors) {
 410                 tasklet_schedule(&dev->datagram_tasklet);
 411         } else {
 412                 unsigned int icr;
 413
 414                 /* Acknowledge interrupt and determine what needs doing. */
 415                 icr = ioread32(dev->iobase + VMCI_ICR_ADDR);
 416                 if (icr == 0 || icr == ~0)
 417                         return IRQ_NONE;
 418
 419                 if (icr & VMCI_ICR_DATAGRAM) {
 420                         tasklet_schedule(&dev->datagram_tasklet);
 421                         icr &= ~VMCI_ICR_DATAGRAM;
 422                 }
 423
 424                 if (icr & VMCI_ICR_NOTIFICATION) {
 425                         tasklet_schedule(&dev->bm_tasklet);
 426                         icr &= ~VMCI_ICR_NOTIFICATION;
 427                 }
 428
 429                 if (icr != 0)
 430                         dev_warn(dev->dev,
 431                                  "Ignoring unknown interrupt cause (%d)\n",
 432                                  icr);
 433         }
 434
 435         return IRQ_HANDLED;
 436 }
 437
 438 /*
 439  * Interrupt handler for MSI-X interrupt vector VMCI_INTR_NOTIFICATION,
 440  * which is for the notification bitmap.  Will only get called if we are
 441  * using MSI-X with exclusive vectors.
 442  */
 443 static irqreturn_t vmci_interrupt_bm(int irq, void *_dev)
 444 {
 445         struct vmci_guest_device *dev = _dev;
 446
 447         /* For MSI-X we can just assume it was meant for us. */
 448         tasklet_schedule(&dev->bm_tasklet);
 449
 450         return IRQ_HANDLED;
 451 }
 452
 453 /*
 454  * Most of the initialization at module load time is done here.
 455  */
 456 static int vmci_guest_probe_device(struct pci_dev *pdev,
 457                                    const struct pci_device_id *id)
 458 {
 459         struct vmci_guest_device *vmci_dev;
 460         void __iomem *iobase;
 461         unsigned int capabilities;
 462         unsigned long cmd;
 463         int vmci_err;
 464         int error;
 465
 466         dev_dbg(&pdev->dev, "Probing for vmci/PCI guest device\n");
 467
 468         error = pcim_enable_device(pdev);
 469         if (error) {
 470                 dev_err(&pdev->dev,
 471                         "Failed to enable VMCI device: %d\n", error);
 472                 return error;
 473         }
 474
 475         error = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
 476         if (error) {
 477                 dev_err(&pdev->dev, "Failed to reserve/map IO regions\n");
 478                 return error;
 479         }
 480
 481         iobase = pcim_iomap_table(pdev)[0];
 482
 483         dev_info(&pdev->dev, "Found VMCI PCI device at %#lx, irq %u\n",
 484                  (unsigned long)iobase, pdev->irq);
 485
 486         vmci_dev = devm_kzalloc(&pdev->dev, sizeof(*vmci_dev), GFP_KERNEL);
 487         if (!vmci_dev) {
 488                 dev_err(&pdev->dev,
 489                         "Can't allocate memory for VMCI device\n");
 490                 return -ENOMEM;
 491         }
 492
 493         vmci_dev->dev = &pdev->dev;
 494         vmci_dev->intr_type = VMCI_INTR_TYPE_INTX;
 495         vmci_dev->exclusive_vectors = false;
 496         vmci_dev->iobase = iobase;
 497
 498         tasklet_init(&vmci_dev->datagram_tasklet,
 499                      vmci_dispatch_dgs, (unsigned long)vmci_dev);
 500         tasklet_init(&vmci_dev->bm_tasklet,
 501                      vmci_process_bitmap, (unsigned long)vmci_dev);
 502
 503         vmci_dev->data_buffer = vmalloc(VMCI_MAX_DG_SIZE);
 504         if (!vmci_dev->data_buffer) {
 505                 dev_err(&pdev->dev,
 506                         "Can't allocate memory for datagram buffer\n");
 507                 return -ENOMEM;
 508         }
 509
 510         pci_set_master(pdev);   /* To enable queue_pair functionality. */
 511
 512         /*
 513          * Verify that the VMCI Device supports the capabilities that
 514          * we need. If the device is missing capabilities that we would
 515          * like to use, check for fallback capabilities and use those
 516          * instead (so we can run a new VM on old hosts). Fail the load if
 517          * a required capability is missing and there is no fallback.
 518          *
 519          * Right now, we need datagrams. There are no fallbacks.
 520          */
 521         capabilities = ioread32(vmci_dev->iobase + VMCI_CAPS_ADDR);
 522         if (!(capabilities & VMCI_CAPS_DATAGRAM)) {
 523                 dev_err(&pdev->dev, "Device does not support datagrams\n");
 524                 error = -ENXIO;
 525                 goto err_free_data_buffer;
 526         }
 527
 528         /*
 529          * If the hardware supports notifications, we will use that as
 530          * well.
 531          */
 532         if (capabilities & VMCI_CAPS_NOTIFICATIONS) {
 533                 vmci_dev->notification_bitmap = dma_alloc_coherent(
 534                         &pdev->dev, PAGE_SIZE, &vmci_dev->notification_base,
 535                         GFP_KERNEL);
 536                 if (!vmci_dev->notification_bitmap) {
 537                         dev_warn(&pdev->dev,
 538                                  "Unable to allocate notification bitmap\n");
 539                 } else {
 540                         memset(vmci_dev->notification_bitmap, 0, PAGE_SIZE);
 541                         capabilities |= VMCI_CAPS_NOTIFICATIONS;
 542                 }
 543         }
 544
 545         dev_info(&pdev->dev, "Using capabilities 0x%x\n", capabilities);
 546
 547         /* Let the host know which capabilities we intend to use. */
 548         iowrite32(capabilities, vmci_dev->iobase + VMCI_CAPS_ADDR);
 549
 550         /* Set up global device so that we can start sending datagrams */
 551         spin_lock_irq(&vmci_dev_spinlock);
 552         vmci_dev_g = vmci_dev;
 553         vmci_pdev = pdev;
 554         spin_unlock_irq(&vmci_dev_spinlock);
 555
 556         /*
 557          * Register notification bitmap with device if that capability is
 558          * used.
 559          */
 560         if (capabilities & VMCI_CAPS_NOTIFICATIONS) {
 561                 unsigned long bitmap_ppn =
 562                         vmci_dev->notification_base >> PAGE_SHIFT;
 563                 if (!vmci_dbell_register_notification_bitmap(bitmap_ppn)) {
 564                         dev_warn(&pdev->dev,
 565                                  "VMCI device unable to register notification bitmap with PPN 0x%x\n",
 566                                  (u32) bitmap_ppn);
 567                         error = -ENXIO;
 568                         goto err_remove_vmci_dev_g;
 569                 }
 570         }
 571
 572         /* Check host capabilities. */
 573         error = vmci_check_host_caps(pdev);
 574         if (error)
 575                 goto err_remove_bitmap;
 576
 577         /* Enable device. */
 578
 579         /*
 580          * We subscribe to the VMCI_EVENT_CTX_ID_UPDATE here so we can
 581          * update the internal context id when needed.
 582          */
 583         vmci_err = vmci_event_subscribe(VMCI_EVENT_CTX_ID_UPDATE,
 584                                         vmci_guest_cid_update, NULL,
 585                                         &ctx_update_sub_id);
 586         if (vmci_err < VMCI_SUCCESS)
 587                 dev_warn(&pdev->dev,
 588                          "Failed to subscribe to event (type=%d): %d\n",
 589                          VMCI_EVENT_CTX_ID_UPDATE, vmci_err);
 590
 591         /*
 592          * Enable interrupts.  Try MSI-X first, then MSI, and then fallback on
 593          * legacy interrupts.
 594          */
 595         if (!vmci_disable_msix && !vmci_enable_msix(pdev, vmci_dev)) {
 596                 vmci_dev->intr_type = VMCI_INTR_TYPE_MSIX;
 597                 vmci_dev->irq = vmci_dev->msix_entries[0].vector;
 598         } else if (!vmci_disable_msi && !pci_enable_msi(pdev)) {
 599                 vmci_dev->intr_type = VMCI_INTR_TYPE_MSI;
 600                 vmci_dev->irq = pdev->irq;
 601         } else {
 602                 vmci_dev->intr_type = VMCI_INTR_TYPE_INTX;
 603                 vmci_dev->irq = pdev->irq;
 604         }
 605
 606         /*
 607          * Request IRQ for legacy or MSI interrupts, or for first
 608          * MSI-X vector.
 609          */
 610         error = request_irq(vmci_dev->irq, vmci_interrupt, IRQF_SHARED,
 611                             KBUILD_MODNAME, vmci_dev);
 612         if (error) {
 613                 dev_err(&pdev->dev, "Irq %u in use: %d\n",
 614                         vmci_dev->irq, error);
 615                 goto err_disable_msi;
 616         }
 617
 618         /*
 619          * For MSI-X with exclusive vectors we need to request an
 620          * interrupt for each vector so that we get a separate
 621          * interrupt handler routine.  This allows us to distinguish
 622          * between the vectors.
 623          */
 624         if (vmci_dev->exclusive_vectors) {
 625                 error = request_irq(vmci_dev->msix_entries[1].vector,
 626                                     vmci_interrupt_bm, 0, KBUILD_MODNAME,
 627                                     vmci_dev);
 628                 if (error) {
 629                         dev_err(&pdev->dev,
 630                                 "Failed to allocate irq %u: %d\n",
 631                                 vmci_dev->msix_entries[1].vector, error);
 632                         goto err_free_irq;
 633                 }
 634         }
 635
 636         dev_dbg(&pdev->dev, "Registered device\n");
 637
 638         atomic_inc(&vmci_num_guest_devices);
 639
 640         /* Enable specific interrupt bits. */
 641         cmd = VMCI_IMR_DATAGRAM;
 642         if (capabilities & VMCI_CAPS_NOTIFICATIONS)
 643                 cmd |= VMCI_IMR_NOTIFICATION;
 644         iowrite32(cmd, vmci_dev->iobase + VMCI_IMR_ADDR);
 645
 646         /* Enable interrupts. */
 647         iowrite32(VMCI_CONTROL_INT_ENABLE,
 648                   vmci_dev->iobase + VMCI_CONTROL_ADDR);
 649
 650         pci_set_drvdata(pdev, vmci_dev);
 651         return 0;
 652
 653 err_free_irq:
 654         free_irq(vmci_dev->irq, vmci_dev);
 655         tasklet_kill(&vmci_dev->datagram_tasklet);
 656         tasklet_kill(&vmci_dev->bm_tasklet);
 657
 658 err_disable_msi:
 659         if (vmci_dev->intr_type == VMCI_INTR_TYPE_MSIX)
 660                 pci_disable_msix(pdev);
 661         else if (vmci_dev->intr_type == VMCI_INTR_TYPE_MSI)
 662                 pci_disable_msi(pdev);
 663
 664         vmci_err = vmci_event_unsubscribe(ctx_update_sub_id);
 665         if (vmci_err < VMCI_SUCCESS)
 666                 dev_warn(&pdev->dev,
 667                          "Failed to unsubscribe from event (type=%d) with subscriber (ID=0x%x): %d\n",
 668                          VMCI_EVENT_CTX_ID_UPDATE, ctx_update_sub_id, vmci_err);
 669
 670 err_remove_bitmap:
 671         if (vmci_dev->notification_bitmap) {
 672                 iowrite32(VMCI_CONTROL_RESET,
 673                           vmci_dev->iobase + VMCI_CONTROL_ADDR);
 674                 dma_free_coherent(&pdev->dev, PAGE_SIZE,
 675                                   vmci_dev->notification_bitmap,
 676                                   vmci_dev->notification_base);
 677         }
 678
 679 err_remove_vmci_dev_g:
 680         spin_lock_irq(&vmci_dev_spinlock);
 681         vmci_pdev = NULL;
 682         vmci_dev_g = NULL;
 683         spin_unlock_irq(&vmci_dev_spinlock);
 684
 685 err_free_data_buffer:
 686         vfree(vmci_dev->data_buffer);
 687
 688         /* The rest are managed resources and will be freed by PCI core */
 689         return error;
 690 }
 691
 692 static void vmci_guest_remove_device(struct pci_dev *pdev)
 693 {
 694         struct vmci_guest_device *vmci_dev = pci_get_drvdata(pdev);
 695         int vmci_err;
 696
 697         dev_dbg(&pdev->dev, "Removing device\n");
 698
 699         atomic_dec(&vmci_num_guest_devices);
 700
 701         vmci_qp_guest_endpoints_exit();
 702
 703         vmci_err = vmci_event_unsubscribe(ctx_update_sub_id);
 704         if (vmci_err < VMCI_SUCCESS)
 705                 dev_warn(&pdev->dev,
 706                          "Failed to unsubscribe from event (type=%d) with subscriber (ID=0x%x): %d\n",
 707                          VMCI_EVENT_CTX_ID_UPDATE, ctx_update_sub_id, vmci_err);
 708
 709         spin_lock_irq(&vmci_dev_spinlock);
 710         vmci_dev_g = NULL;
 711         vmci_pdev = NULL;
 712         spin_unlock_irq(&vmci_dev_spinlock);
 713
 714         dev_dbg(&pdev->dev, "Resetting vmci device\n");
 715         iowrite32(VMCI_CONTROL_RESET, vmci_dev->iobase + VMCI_CONTROL_ADDR);
 716
 717         /*
 718          * Free IRQ and then disable MSI/MSI-X as appropriate.  For
 719          * MSI-X, we might have multiple vectors, each with their own
 720          * IRQ, which we must free too.
 721          */
 722         free_irq(vmci_dev->irq, vmci_dev);
 723         if (vmci_dev->intr_type == VMCI_INTR_TYPE_MSIX) {
 724                 if (vmci_dev->exclusive_vectors)
 725                         free_irq(vmci_dev->msix_entries[1].vector, vmci_dev);
 726                 pci_disable_msix(pdev);
 727         } else if (vmci_dev->intr_type == VMCI_INTR_TYPE_MSI) {
 728                 pci_disable_msi(pdev);
 729         }
 730
 731         tasklet_kill(&vmci_dev->datagram_tasklet);
 732         tasklet_kill(&vmci_dev->bm_tasklet);
 733
 734         if (vmci_dev->notification_bitmap) {
 735                 /*
 736                  * The device reset above cleared the bitmap state of the
 737                  * device, so we can safely free it here.
 738                  */
 739
 740                 dma_free_coherent(&pdev->dev, PAGE_SIZE,
 741                                   vmci_dev->notification_bitmap,
 742                                   vmci_dev->notification_base);
 743         }
 744
 745         vfree(vmci_dev->data_buffer);
 746
 747         /* The rest are managed resources and will be freed by PCI core */
 748 }
 749
 750 static const struct pci_device_id vmci_ids[] = {
 751         { PCI_DEVICE(PCI_VENDOR_ID_VMWARE, PCI_DEVICE_ID_VMWARE_VMCI), },
 752         { 0 },
 753 };
 754 MODULE_DEVICE_TABLE(pci, vmci_ids);
 755
 756 static struct pci_driver vmci_guest_driver = {
 757         .name           = KBUILD_MODNAME,
 758         .id_table       = vmci_ids,
 759         .probe          = vmci_guest_probe_device,
 760         .remove         = vmci_guest_remove_device,
 761 };
 762
 763 int __init vmci_guest_init(void)
 764 {
 765         return pci_register_driver(&vmci_guest_driver);
 766 }
 767
 768 void __exit vmci_guest_exit(void)
 769 {
 770         pci_unregister_driver(&vmci_guest_driver);
 771 }