root/drivers/misc/vmw_vmci/vmci_guest.c

DEFINITIONS

1. vmci_use_ppn64
2. vmci_guest_code_active
3. vmci_get_vm_context_id
4. vmci_send_datagram
5. vmci_guest_cid_update
6. vmci_check_host_caps
7. vmci_dispatch_dgs
8. vmci_process_bitmap
9. vmci_interrupt
10. vmci_interrupt_bm
11. vmci_guest_probe_device
12. vmci_guest_remove_device
13. vmci_guest_init
14. vmci_guest_exit

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * VMware VMCI Driver
   4  *
   5  * Copyright (C) 2012 VMware, Inc. All rights reserved.
   6  */
   7 
   8 #include <linux/vmw_vmci_defs.h>
   9 #include <linux/vmw_vmci_api.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/highmem.h>
  13 #include <linux/kernel.h>
  14 #include <linux/mm.h>
  15 #include <linux/module.h>
  16 #include <linux/sched.h>
  17 #include <linux/slab.h>
  18 #include <linux/init.h>
  19 #include <linux/pci.h>
  20 #include <linux/smp.h>
  21 #include <linux/io.h>
  22 #include <linux/vmalloc.h>
  23 
  24 #include "vmci_datagram.h"
  25 #include "vmci_doorbell.h"
  26 #include "vmci_context.h"
  27 #include "vmci_driver.h"
  28 #include "vmci_event.h"
  29 
  30 #define PCI_DEVICE_ID_VMWARE_VMCI       0x0740
  31 
  32 #define VMCI_UTIL_NUM_RESOURCES 1
  33 
  34 static bool vmci_disable_msi;
  35 module_param_named(disable_msi, vmci_disable_msi, bool, 0);
  36 MODULE_PARM_DESC(disable_msi, "Disable MSI use in driver - (default=0)");
  37 
  38 static bool vmci_disable_msix;
  39 module_param_named(disable_msix, vmci_disable_msix, bool, 0);
  40 MODULE_PARM_DESC(disable_msix, "Disable MSI-X use in driver - (default=0)");
  41 
  42 static u32 ctx_update_sub_id = VMCI_INVALID_ID;
  43 static u32 vm_context_id = VMCI_INVALID_ID;
  44 
  45 struct vmci_guest_device {
  46         struct device *dev;     /* PCI device we are attached to */
  47         void __iomem *iobase;
  48 
  49         bool exclusive_vectors;
  50 
  51         struct tasklet_struct datagram_tasklet;
  52         struct tasklet_struct bm_tasklet;
  53 
  54         void *data_buffer;
  55         void *notification_bitmap;
  56         dma_addr_t notification_base;
  57 };
  58 
  59 static bool use_ppn64;
  60 
  61 bool vmci_use_ppn64(void)
  62 {
  63         return use_ppn64;
  64 }
  65 
  66 /* vmci_dev singleton device and supporting data*/
  67 struct pci_dev *vmci_pdev;
  68 static struct vmci_guest_device *vmci_dev_g;
  69 static DEFINE_SPINLOCK(vmci_dev_spinlock);
  70 
  71 static atomic_t vmci_num_guest_devices = ATOMIC_INIT(0);
  72 
  73 bool vmci_guest_code_active(void)
  74 {
  75         return atomic_read(&vmci_num_guest_devices) != 0;
  76 }
  77 
  78 u32 vmci_get_vm_context_id(void)
  79 {
  80         if (vm_context_id == VMCI_INVALID_ID) {
  81                 struct vmci_datagram get_cid_msg;
  82                 get_cid_msg.dst =
  83                     vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
  84                                      VMCI_GET_CONTEXT_ID);
  85                 get_cid_msg.src = VMCI_ANON_SRC_HANDLE;
  86                 get_cid_msg.payload_size = 0;
  87                 vm_context_id = vmci_send_datagram(&get_cid_msg);
  88         }
  89         return vm_context_id;
  90 }
  91 
  92 /*
  93  * VM to hypervisor call mechanism. We use the standard VMware naming
  94  * convention since shared code is calling this function as well.
  95  */
  96 int vmci_send_datagram(struct vmci_datagram *dg)
  97 {
  98         unsigned long flags;
  99         int result;
 100 
 101         /* Check args. */
 102         if (dg == NULL)
 103                 return VMCI_ERROR_INVALID_ARGS;
 104 
 105         /*
 106          * Need to acquire spinlock on the device because the datagram
 107          * data may be spread over multiple pages and the monitor may
 108          * interleave device user rpc calls from multiple
 109          * VCPUs. Acquiring the spinlock precludes that
 110          * possibility. Disabling interrupts to avoid incoming
 111          * datagrams during a "rep out" and possibly landing up in
 112          * this function.
 113          */
 114         spin_lock_irqsave(&vmci_dev_spinlock, flags);
 115 
 116         if (vmci_dev_g) {
 117                 iowrite8_rep(vmci_dev_g->iobase + VMCI_DATA_OUT_ADDR,
 118                              dg, VMCI_DG_SIZE(dg));
 119                 result = ioread32(vmci_dev_g->iobase + VMCI_RESULT_LOW_ADDR);
 120         } else {
 121                 result = VMCI_ERROR_UNAVAILABLE;
 122         }
 123 
 124         spin_unlock_irqrestore(&vmci_dev_spinlock, flags);
 125 
 126         return result;
 127 }
 128 EXPORT_SYMBOL_GPL(vmci_send_datagram);
 129 
 130 /*
 131  * Gets called with the new context id if updated or resumed.
 132  * Context id.
 133  */
 134 static void vmci_guest_cid_update(u32 sub_id,
 135                                   const struct vmci_event_data *event_data,
 136                                   void *client_data)
 137 {
 138         const struct vmci_event_payld_ctx *ev_payload =
 139                                 vmci_event_data_const_payload(event_data);
 140 
 141         if (sub_id != ctx_update_sub_id) {
 142                 pr_devel("Invalid subscriber (ID=0x%x)\n", sub_id);
 143                 return;
 144         }
 145 
 146         if (!event_data || ev_payload->context_id == VMCI_INVALID_ID) {
 147                 pr_devel("Invalid event data\n");
 148                 return;
 149         }
 150 
 151         pr_devel("Updating context from (ID=0x%x) to (ID=0x%x) on event (type=%d)\n",
 152                  vm_context_id, ev_payload->context_id, event_data->event);
 153 
 154         vm_context_id = ev_payload->context_id;
 155 }
 156 
 157 /*
 158  * Verify that the host supports the hypercalls we need. If it does not,
 159  * try to find fallback hypercalls and use those instead.  Returns
 160  * true if required hypercalls (or fallback hypercalls) are
 161  * supported by the host, false otherwise.
 162  */
 163 static int vmci_check_host_caps(struct pci_dev *pdev)
 164 {
 165         bool result;
 166         struct vmci_resource_query_msg *msg;
 167         u32 msg_size = sizeof(struct vmci_resource_query_hdr) +
 168                                 VMCI_UTIL_NUM_RESOURCES * sizeof(u32);
 169         struct vmci_datagram *check_msg;
 170 
 171         check_msg = kmalloc(msg_size, GFP_KERNEL);
 172         if (!check_msg) {
 173                 dev_err(&pdev->dev, "%s: Insufficient memory\n", __func__);
 174                 return -ENOMEM;
 175         }
 176 
 177         check_msg->dst = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID,
 178                                           VMCI_RESOURCES_QUERY);
 179         check_msg->src = VMCI_ANON_SRC_HANDLE;
 180         check_msg->payload_size = msg_size - VMCI_DG_HEADERSIZE;
 181         msg = (struct vmci_resource_query_msg *)VMCI_DG_PAYLOAD(check_msg);
 182 
 183         msg->num_resources = VMCI_UTIL_NUM_RESOURCES;
 184         msg->resources[0] = VMCI_GET_CONTEXT_ID;
 185 
 186         /* Checks that hyper calls are supported */
 187         result = vmci_send_datagram(check_msg) == 0x01;
 188         kfree(check_msg);
 189 
 190         dev_dbg(&pdev->dev, "%s: Host capability check: %s\n",
 191                 __func__, result ? "PASSED" : "FAILED");
 192 
 193         /* We need the vector. There are no fallbacks. */
 194         return result ? 0 : -ENXIO;
 195 }
 196 
 197 /*
 198  * Reads datagrams from the data in port and dispatches them. We
 199  * always start reading datagrams into only the first page of the
 200  * datagram buffer. If the datagrams don't fit into one page, we
 201  * use the maximum datagram buffer size for the remainder of the
 202  * invocation. This is a simple heuristic for not penalizing
 203  * small datagrams.
 204  *
 205  * This function assumes that it has exclusive access to the data
 206  * in port for the duration of the call.
 207  */
 208 static void vmci_dispatch_dgs(unsigned long data)
 209 {
 210         struct vmci_guest_device *vmci_dev = (struct vmci_guest_device *)data;
 211         u8 *dg_in_buffer = vmci_dev->data_buffer;
 212         struct vmci_datagram *dg;
 213         size_t dg_in_buffer_size = VMCI_MAX_DG_SIZE;
 214         size_t current_dg_in_buffer_size = PAGE_SIZE;
 215         size_t remaining_bytes;
 216 
 217         BUILD_BUG_ON(VMCI_MAX_DG_SIZE < PAGE_SIZE);
 218 
 219         ioread8_rep(vmci_dev->iobase + VMCI_DATA_IN_ADDR,
 220                     vmci_dev->data_buffer, current_dg_in_buffer_size);
 221         dg = (struct vmci_datagram *)dg_in_buffer;
 222         remaining_bytes = current_dg_in_buffer_size;
 223 
 224         while (dg->dst.resource != VMCI_INVALID_ID ||
 225                remaining_bytes > PAGE_SIZE) {
 226                 unsigned dg_in_size;
 227 
 228                 /*
 229                  * When the input buffer spans multiple pages, a datagram can
 230                  * start on any page boundary in the buffer.
 231                  */
 232                 if (dg->dst.resource == VMCI_INVALID_ID) {
 233                         dg = (struct vmci_datagram *)roundup(
 234                                 (uintptr_t)dg + 1, PAGE_SIZE);
 235                         remaining_bytes =
 236                                 (size_t)(dg_in_buffer +
 237                                          current_dg_in_buffer_size -
 238                                          (u8 *)dg);
 239                         continue;
 240                 }
 241 
 242                 dg_in_size = VMCI_DG_SIZE_ALIGNED(dg);
 243 
 244                 if (dg_in_size <= dg_in_buffer_size) {
 245                         int result;
 246 
 247                         /*
 248                          * If the remaining bytes in the datagram
 249                          * buffer doesn't contain the complete
 250                          * datagram, we first make sure we have enough
 251                          * room for it and then we read the reminder
 252                          * of the datagram and possibly any following
 253                          * datagrams.
 254                          */
 255                         if (dg_in_size > remaining_bytes) {
 256                                 if (remaining_bytes !=
 257                                     current_dg_in_buffer_size) {
 258 
 259                                         /*
 260                                          * We move the partial
 261                                          * datagram to the front and
 262                                          * read the reminder of the
 263                                          * datagram and possibly
 264                                          * following calls into the
 265                                          * following bytes.
 266                                          */
 267                                         memmove(dg_in_buffer, dg_in_buffer +
 268                                                 current_dg_in_buffer_size -
 269                                                 remaining_bytes,
 270                                                 remaining_bytes);
 271                                         dg = (struct vmci_datagram *)
 272                                             dg_in_buffer;
 273                                 }
 274 
 275                                 if (current_dg_in_buffer_size !=
 276                                     dg_in_buffer_size)
 277                                         current_dg_in_buffer_size =
 278                                             dg_in_buffer_size;
 279 
 280                                 ioread8_rep(vmci_dev->iobase +
 281                                                 VMCI_DATA_IN_ADDR,
 282                                         vmci_dev->data_buffer +
 283                                                 remaining_bytes,
 284                                         current_dg_in_buffer_size -
 285                                                 remaining_bytes);
 286                         }
 287 
 288                         /*
 289                          * We special case event datagrams from the
 290                          * hypervisor.
 291                          */
 292                         if (dg->src.context == VMCI_HYPERVISOR_CONTEXT_ID &&
 293                             dg->dst.resource == VMCI_EVENT_HANDLER) {
 294                                 result = vmci_event_dispatch(dg);
 295                         } else {
 296                                 result = vmci_datagram_invoke_guest_handler(dg);
 297                         }
 298                         if (result < VMCI_SUCCESS)
 299                                 dev_dbg(vmci_dev->dev,
 300                                         "Datagram with resource (ID=0x%x) failed (err=%d)\n",
 301                                          dg->dst.resource, result);
 302 
 303                         /* On to the next datagram. */
 304                         dg = (struct vmci_datagram *)((u8 *)dg +
 305                                                       dg_in_size);
 306                 } else {
 307                         size_t bytes_to_skip;
 308 
 309                         /*
 310                          * Datagram doesn't fit in datagram buffer of maximal
 311                          * size. We drop it.
 312                          */
 313                         dev_dbg(vmci_dev->dev,
 314                                 "Failed to receive datagram (size=%u bytes)\n",
 315                                  dg_in_size);
 316 
 317                         bytes_to_skip = dg_in_size - remaining_bytes;
 318                         if (current_dg_in_buffer_size != dg_in_buffer_size)
 319                                 current_dg_in_buffer_size = dg_in_buffer_size;
 320 
 321                         for (;;) {
 322                                 ioread8_rep(vmci_dev->iobase +
 323                                                 VMCI_DATA_IN_ADDR,
 324                                         vmci_dev->data_buffer,
 325                                         current_dg_in_buffer_size);
 326                                 if (bytes_to_skip <= current_dg_in_buffer_size)
 327                                         break;
 328 
 329                                 bytes_to_skip -= current_dg_in_buffer_size;
 330                         }
 331                         dg = (struct vmci_datagram *)(dg_in_buffer +
 332                                                       bytes_to_skip);
 333                 }
 334 
 335                 remaining_bytes =
 336                     (size_t) (dg_in_buffer + current_dg_in_buffer_size -
 337                               (u8 *)dg);
 338 
 339                 if (remaining_bytes < VMCI_DG_HEADERSIZE) {
 340                         /* Get the next batch of datagrams. */
 341 
 342                         ioread8_rep(vmci_dev->iobase + VMCI_DATA_IN_ADDR,
 343                                     vmci_dev->data_buffer,
 344                                     current_dg_in_buffer_size);
 345                         dg = (struct vmci_datagram *)dg_in_buffer;
 346                         remaining_bytes = current_dg_in_buffer_size;
 347                 }
 348         }
 349 }
 350 
 351 /*
 352  * Scans the notification bitmap for raised flags, clears them
 353  * and handles the notifications.
 354  */
 355 static void vmci_process_bitmap(unsigned long data)
 356 {
 357         struct vmci_guest_device *dev = (struct vmci_guest_device *)data;
 358 
 359         if (!dev->notification_bitmap) {
 360                 dev_dbg(dev->dev, "No bitmap present in %s\n", __func__);
 361                 return;
 362         }
 363 
 364         vmci_dbell_scan_notification_entries(dev->notification_bitmap);
 365 }
 366 
 367 /*
 368  * Interrupt handler for legacy or MSI interrupt, or for first MSI-X
 369  * interrupt (vector VMCI_INTR_DATAGRAM).
 370  */
 371 static irqreturn_t vmci_interrupt(int irq, void *_dev)
 372 {
 373         struct vmci_guest_device *dev = _dev;
 374 
 375         /*
 376          * If we are using MSI-X with exclusive vectors then we simply schedule
 377          * the datagram tasklet, since we know the interrupt was meant for us.
 378          * Otherwise we must read the ICR to determine what to do.
 379          */
 380 
 381         if (dev->exclusive_vectors) {
 382                 tasklet_schedule(&dev->datagram_tasklet);
 383         } else {
 384                 unsigned int icr;
 385 
 386                 /* Acknowledge interrupt and determine what needs doing. */
 387                 icr = ioread32(dev->iobase + VMCI_ICR_ADDR);
 388                 if (icr == 0 || icr == ~0)
 389                         return IRQ_NONE;
 390 
 391                 if (icr & VMCI_ICR_DATAGRAM) {
 392                         tasklet_schedule(&dev->datagram_tasklet);
 393                         icr &= ~VMCI_ICR_DATAGRAM;
 394                 }
 395 
 396                 if (icr & VMCI_ICR_NOTIFICATION) {
 397                         tasklet_schedule(&dev->bm_tasklet);
 398                         icr &= ~VMCI_ICR_NOTIFICATION;
 399                 }
 400 
 401                 if (icr != 0)
 402                         dev_warn(dev->dev,
 403                                  "Ignoring unknown interrupt cause (%d)\n",
 404                                  icr);
 405         }
 406 
 407         return IRQ_HANDLED;
 408 }
 409 
 410 /*
 411  * Interrupt handler for MSI-X interrupt vector VMCI_INTR_NOTIFICATION,
 412  * which is for the notification bitmap.  Will only get called if we are
 413  * using MSI-X with exclusive vectors.
 414  */
 415 static irqreturn_t vmci_interrupt_bm(int irq, void *_dev)
 416 {
 417         struct vmci_guest_device *dev = _dev;
 418 
 419         /* For MSI-X we can just assume it was meant for us. */
 420         tasklet_schedule(&dev->bm_tasklet);
 421 
 422         return IRQ_HANDLED;
 423 }
 424 
 425 /*
 426  * Most of the initialization at module load time is done here.
 427  */
 428 static int vmci_guest_probe_device(struct pci_dev *pdev,
 429                                    const struct pci_device_id *id)
 430 {
 431         struct vmci_guest_device *vmci_dev;
 432         void __iomem *iobase;
 433         unsigned int capabilities;
 434         unsigned int caps_in_use;
 435         unsigned long cmd;
 436         int vmci_err;
 437         int error;
 438 
 439         dev_dbg(&pdev->dev, "Probing for vmci/PCI guest device\n");
 440 
 441         error = pcim_enable_device(pdev);
 442         if (error) {
 443                 dev_err(&pdev->dev,
 444                         "Failed to enable VMCI device: %d\n", error);
 445                 return error;
 446         }
 447 
 448         error = pcim_iomap_regions(pdev, 1 << 0, KBUILD_MODNAME);
 449         if (error) {
 450                 dev_err(&pdev->dev, "Failed to reserve/map IO regions\n");
 451                 return error;
 452         }
 453 
 454         iobase = pcim_iomap_table(pdev)[0];
 455 
 456         dev_info(&pdev->dev, "Found VMCI PCI device at %#lx, irq %u\n",
 457                  (unsigned long)iobase, pdev->irq);
 458 
 459         vmci_dev = devm_kzalloc(&pdev->dev, sizeof(*vmci_dev), GFP_KERNEL);
 460         if (!vmci_dev) {
 461                 dev_err(&pdev->dev,
 462                         "Can't allocate memory for VMCI device\n");
 463                 return -ENOMEM;
 464         }
 465 
 466         vmci_dev->dev = &pdev->dev;
 467         vmci_dev->exclusive_vectors = false;
 468         vmci_dev->iobase = iobase;
 469 
 470         tasklet_init(&vmci_dev->datagram_tasklet,
 471                      vmci_dispatch_dgs, (unsigned long)vmci_dev);
 472         tasklet_init(&vmci_dev->bm_tasklet,
 473                      vmci_process_bitmap, (unsigned long)vmci_dev);
 474 
 475         vmci_dev->data_buffer = vmalloc(VMCI_MAX_DG_SIZE);
 476         if (!vmci_dev->data_buffer) {
 477                 dev_err(&pdev->dev,
 478                         "Can't allocate memory for datagram buffer\n");
 479                 return -ENOMEM;
 480         }
 481 
 482         pci_set_master(pdev);   /* To enable queue_pair functionality. */
 483 
 484         /*
 485          * Verify that the VMCI Device supports the capabilities that
 486          * we need. If the device is missing capabilities that we would
 487          * like to use, check for fallback capabilities and use those
 488          * instead (so we can run a new VM on old hosts). Fail the load if
 489          * a required capability is missing and there is no fallback.
 490          *
 491          * Right now, we need datagrams. There are no fallbacks.
 492          */
 493         capabilities = ioread32(vmci_dev->iobase + VMCI_CAPS_ADDR);
 494         if (!(capabilities & VMCI_CAPS_DATAGRAM)) {
 495                 dev_err(&pdev->dev, "Device does not support datagrams\n");
 496                 error = -ENXIO;
 497                 goto err_free_data_buffer;
 498         }
 499         caps_in_use = VMCI_CAPS_DATAGRAM;
 500 
 501         /*
 502          * Use 64-bit PPNs if the device supports.
 503          *
 504          * There is no check for the return value of dma_set_mask_and_coherent
 505          * since this driver can handle the default mask values if
 506          * dma_set_mask_and_coherent fails.
 507          */
 508         if (capabilities & VMCI_CAPS_PPN64) {
 509                 dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
 510                 use_ppn64 = true;
 511                 caps_in_use |= VMCI_CAPS_PPN64;
 512         } else {
 513                 dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(44));
 514                 use_ppn64 = false;
 515         }
 516 
 517         /*
 518          * If the hardware supports notifications, we will use that as
 519          * well.
 520          */
 521         if (capabilities & VMCI_CAPS_NOTIFICATIONS) {
 522                 vmci_dev->notification_bitmap = dma_alloc_coherent(
 523                         &pdev->dev, PAGE_SIZE, &vmci_dev->notification_base,
 524                         GFP_KERNEL);
 525                 if (!vmci_dev->notification_bitmap) {
 526                         dev_warn(&pdev->dev,
 527                                  "Unable to allocate notification bitmap\n");
 528                 } else {
 529                         memset(vmci_dev->notification_bitmap, 0, PAGE_SIZE);
 530                         caps_in_use |= VMCI_CAPS_NOTIFICATIONS;
 531                 }
 532         }
 533 
 534         dev_info(&pdev->dev, "Using capabilities 0x%x\n", caps_in_use);
 535 
 536         /* Let the host know which capabilities we intend to use. */
 537         iowrite32(caps_in_use, vmci_dev->iobase + VMCI_CAPS_ADDR);
 538 
 539         /* Set up global device so that we can start sending datagrams */
 540         spin_lock_irq(&vmci_dev_spinlock);
 541         vmci_dev_g = vmci_dev;
 542         vmci_pdev = pdev;
 543         spin_unlock_irq(&vmci_dev_spinlock);
 544 
 545         /*
 546          * Register notification bitmap with device if that capability is
 547          * used.
 548          */
 549         if (caps_in_use & VMCI_CAPS_NOTIFICATIONS) {
 550                 unsigned long bitmap_ppn =
 551                         vmci_dev->notification_base >> PAGE_SHIFT;
 552                 if (!vmci_dbell_register_notification_bitmap(bitmap_ppn)) {
 553                         dev_warn(&pdev->dev,
 554                                  "VMCI device unable to register notification bitmap with PPN 0x%lx\n",
 555                                  bitmap_ppn);
 556                         error = -ENXIO;
 557                         goto err_remove_vmci_dev_g;
 558                 }
 559         }
 560 
 561         /* Check host capabilities. */
 562         error = vmci_check_host_caps(pdev);
 563         if (error)
 564                 goto err_remove_bitmap;
 565 
 566         /* Enable device. */
 567 
 568         /*
 569          * We subscribe to the VMCI_EVENT_CTX_ID_UPDATE here so we can
 570          * update the internal context id when needed.
 571          */
 572         vmci_err = vmci_event_subscribe(VMCI_EVENT_CTX_ID_UPDATE,
 573                                         vmci_guest_cid_update, NULL,
 574                                         &ctx_update_sub_id);
 575         if (vmci_err < VMCI_SUCCESS)
 576                 dev_warn(&pdev->dev,
 577                          "Failed to subscribe to event (type=%d): %d\n",
 578                          VMCI_EVENT_CTX_ID_UPDATE, vmci_err);
 579 
 580         /*
 581          * Enable interrupts.  Try MSI-X first, then MSI, and then fallback on
 582          * legacy interrupts.
 583          */
 584         error = pci_alloc_irq_vectors(pdev, VMCI_MAX_INTRS, VMCI_MAX_INTRS,
 585                         PCI_IRQ_MSIX);
 586         if (error < 0) {
 587                 error = pci_alloc_irq_vectors(pdev, 1, 1,
 588                                 PCI_IRQ_MSIX | PCI_IRQ_MSI | PCI_IRQ_LEGACY);
 589                 if (error < 0)
 590                         goto err_remove_bitmap;
 591         } else {
 592                 vmci_dev->exclusive_vectors = true;
 593         }
 594 
 595         /*
 596          * Request IRQ for legacy or MSI interrupts, or for first
 597          * MSI-X vector.
 598          */
 599         error = request_irq(pci_irq_vector(pdev, 0), vmci_interrupt,
 600                             IRQF_SHARED, KBUILD_MODNAME, vmci_dev);
 601         if (error) {
 602                 dev_err(&pdev->dev, "Irq %u in use: %d\n",
 603                         pci_irq_vector(pdev, 0), error);
 604                 goto err_disable_msi;
 605         }
 606 
 607         /*
 608          * For MSI-X with exclusive vectors we need to request an
 609          * interrupt for each vector so that we get a separate
 610          * interrupt handler routine.  This allows us to distinguish
 611          * between the vectors.
 612          */
 613         if (vmci_dev->exclusive_vectors) {
 614                 error = request_irq(pci_irq_vector(pdev, 1),
 615                                     vmci_interrupt_bm, 0, KBUILD_MODNAME,
 616                                     vmci_dev);
 617                 if (error) {
 618                         dev_err(&pdev->dev,
 619                                 "Failed to allocate irq %u: %d\n",
 620                                 pci_irq_vector(pdev, 1), error);
 621                         goto err_free_irq;
 622                 }
 623         }
 624 
 625         dev_dbg(&pdev->dev, "Registered device\n");
 626 
 627         atomic_inc(&vmci_num_guest_devices);
 628 
 629         /* Enable specific interrupt bits. */
 630         cmd = VMCI_IMR_DATAGRAM;
 631         if (caps_in_use & VMCI_CAPS_NOTIFICATIONS)
 632                 cmd |= VMCI_IMR_NOTIFICATION;
 633         iowrite32(cmd, vmci_dev->iobase + VMCI_IMR_ADDR);
 634 
 635         /* Enable interrupts. */
 636         iowrite32(VMCI_CONTROL_INT_ENABLE,
 637                   vmci_dev->iobase + VMCI_CONTROL_ADDR);
 638 
 639         pci_set_drvdata(pdev, vmci_dev);
 640         return 0;
 641 
 642 err_free_irq:
 643         free_irq(pci_irq_vector(pdev, 0), vmci_dev);
 644         tasklet_kill(&vmci_dev->datagram_tasklet);
 645         tasklet_kill(&vmci_dev->bm_tasklet);
 646 
 647 err_disable_msi:
 648         pci_free_irq_vectors(pdev);
 649 
 650         vmci_err = vmci_event_unsubscribe(ctx_update_sub_id);
 651         if (vmci_err < VMCI_SUCCESS)
 652                 dev_warn(&pdev->dev,
 653                          "Failed to unsubscribe from event (type=%d) with subscriber (ID=0x%x): %d\n",
 654                          VMCI_EVENT_CTX_ID_UPDATE, ctx_update_sub_id, vmci_err);
 655 
 656 err_remove_bitmap:
 657         if (vmci_dev->notification_bitmap) {
 658                 iowrite32(VMCI_CONTROL_RESET,
 659                           vmci_dev->iobase + VMCI_CONTROL_ADDR);
 660                 dma_free_coherent(&pdev->dev, PAGE_SIZE,
 661                                   vmci_dev->notification_bitmap,
 662                                   vmci_dev->notification_base);
 663         }
 664 
 665 err_remove_vmci_dev_g:
 666         spin_lock_irq(&vmci_dev_spinlock);
 667         vmci_pdev = NULL;
 668         vmci_dev_g = NULL;
 669         spin_unlock_irq(&vmci_dev_spinlock);
 670 
 671 err_free_data_buffer:
 672         vfree(vmci_dev->data_buffer);
 673 
 674         /* The rest are managed resources and will be freed by PCI core */
 675         return error;
 676 }
 677 
 678 static void vmci_guest_remove_device(struct pci_dev *pdev)
 679 {
 680         struct vmci_guest_device *vmci_dev = pci_get_drvdata(pdev);
 681         int vmci_err;
 682 
 683         dev_dbg(&pdev->dev, "Removing device\n");
 684 
 685         atomic_dec(&vmci_num_guest_devices);
 686 
 687         vmci_qp_guest_endpoints_exit();
 688 
 689         vmci_err = vmci_event_unsubscribe(ctx_update_sub_id);
 690         if (vmci_err < VMCI_SUCCESS)
 691                 dev_warn(&pdev->dev,
 692                          "Failed to unsubscribe from event (type=%d) with subscriber (ID=0x%x): %d\n",
 693                          VMCI_EVENT_CTX_ID_UPDATE, ctx_update_sub_id, vmci_err);
 694 
 695         spin_lock_irq(&vmci_dev_spinlock);
 696         vmci_dev_g = NULL;
 697         vmci_pdev = NULL;
 698         spin_unlock_irq(&vmci_dev_spinlock);
 699 
 700         dev_dbg(&pdev->dev, "Resetting vmci device\n");
 701         iowrite32(VMCI_CONTROL_RESET, vmci_dev->iobase + VMCI_CONTROL_ADDR);
 702 
 703         /*
 704          * Free IRQ and then disable MSI/MSI-X as appropriate.  For
 705          * MSI-X, we might have multiple vectors, each with their own
 706          * IRQ, which we must free too.
 707          */
 708         if (vmci_dev->exclusive_vectors)
 709                 free_irq(pci_irq_vector(pdev, 1), vmci_dev);
 710         free_irq(pci_irq_vector(pdev, 0), vmci_dev);
 711         pci_free_irq_vectors(pdev);
 712 
 713         tasklet_kill(&vmci_dev->datagram_tasklet);
 714         tasklet_kill(&vmci_dev->bm_tasklet);
 715 
 716         if (vmci_dev->notification_bitmap) {
 717                 /*
 718                  * The device reset above cleared the bitmap state of the
 719                  * device, so we can safely free it here.
 720                  */
 721 
 722                 dma_free_coherent(&pdev->dev, PAGE_SIZE,
 723                                   vmci_dev->notification_bitmap,
 724                                   vmci_dev->notification_base);
 725         }
 726 
 727         vfree(vmci_dev->data_buffer);
 728 
 729         /* The rest are managed resources and will be freed by PCI core */
 730 }
 731 
 732 static const struct pci_device_id vmci_ids[] = {
 733         { PCI_DEVICE(PCI_VENDOR_ID_VMWARE, PCI_DEVICE_ID_VMWARE_VMCI), },
 734         { 0 },
 735 };
 736 MODULE_DEVICE_TABLE(pci, vmci_ids);
 737 
 738 static struct pci_driver vmci_guest_driver = {
 739         .name           = KBUILD_MODNAME,
 740         .id_table       = vmci_ids,
 741         .probe          = vmci_guest_probe_device,
 742         .remove         = vmci_guest_remove_device,
 743 };
 744 
 745 int __init vmci_guest_init(void)
 746 {
 747         return pci_register_driver(&vmci_guest_driver);
 748 }
 749 
 750 void __exit vmci_guest_exit(void)
 751 {
 752         pci_unregister_driver(&vmci_guest_driver);
 753 }