sound/pci/asihpi/hpioctl.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*******************************************************************************
   3     AudioScience HPI driver
   4     Common Linux HPI ioctl and module probe/remove functions
   5
   6     Copyright (C) 1997-2014  AudioScience Inc. <support@audioscience.com>
   7
   8
   9 *******************************************************************************/
  10 #define SOURCEFILE_NAME "hpioctl.c"
  11
  12 #include "hpi_internal.h"
  13 #include "hpi_version.h"
  14 #include "hpimsginit.h"
  15 #include "hpidebug.h"
  16 #include "hpimsgx.h"
  17 #include "hpioctl.h"
  18 #include "hpicmn.h"
  19
  20 #include <linux/fs.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/slab.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/uaccess.h>
  25 #include <linux/pci.h>
  26 #include <linux/stringify.h>
  27 #include <linux/module.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/nospec.h>
  30
  31 #ifdef MODULE_FIRMWARE
  32 MODULE_FIRMWARE("asihpi/dsp5000.bin");
  33 MODULE_FIRMWARE("asihpi/dsp6200.bin");
  34 MODULE_FIRMWARE("asihpi/dsp6205.bin");
  35 MODULE_FIRMWARE("asihpi/dsp6400.bin");
  36 MODULE_FIRMWARE("asihpi/dsp6600.bin");
  37 MODULE_FIRMWARE("asihpi/dsp8700.bin");
  38 MODULE_FIRMWARE("asihpi/dsp8900.bin");
  39 #endif
  40
  41 static int prealloc_stream_buf;
  42 module_param(prealloc_stream_buf, int, 0444);
  43 MODULE_PARM_DESC(prealloc_stream_buf,
  44         "Preallocate size for per-adapter stream buffer");
  45
  46 /* Allow the debug level to be changed after module load.
  47  E.g.   echo 2 > /sys/module/asihpi/parameters/hpiDebugLevel
  48 */
  49 module_param(hpi_debug_level, int, 0644);
  50 MODULE_PARM_DESC(hpi_debug_level, "debug verbosity 0..5");
  51
  52 /* List of adapters found */
  53 static struct hpi_adapter adapters[HPI_MAX_ADAPTERS];
  54
  55 /* Wrapper function to HPI_Message to enable dumping of the
  56    message and response types.
  57 */
  58 static void hpi_send_recv_f(struct hpi_message *phm, struct hpi_response *phr,
  59         struct file *file)
  60 {
  61         if ((phm->adapter_index >= HPI_MAX_ADAPTERS)
  62                 && (phm->object != HPI_OBJ_SUBSYSTEM))
  63                 phr->error = HPI_ERROR_INVALID_OBJ_INDEX;
  64         else
  65                 hpi_send_recv_ex(phm, phr, file);
  66 }
  67
  68 /* This is called from hpifunc.c functions, called by ALSA
  69  * (or other kernel process) In this case there is no file descriptor
  70  * available for the message cache code
  71  */
  72 void hpi_send_recv(struct hpi_message *phm, struct hpi_response *phr)
  73 {
  74         hpi_send_recv_f(phm, phr, HOWNER_KERNEL);
  75 }
  76
  77 EXPORT_SYMBOL(hpi_send_recv);
  78 /* for radio-asihpi */
  79
  80 int asihpi_hpi_release(struct file *file)
  81 {
  82         struct hpi_message hm;
  83         struct hpi_response hr;
  84
  85 /* HPI_DEBUG_LOG(INFO,"hpi_release file %p, pid %d\n", file, current->pid); */
  86         /* close the subsystem just in case the application forgot to. */
  87         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
  88                 HPI_SUBSYS_CLOSE);
  89         hpi_send_recv_ex(&hm, &hr, file);
  90         return 0;
  91 }
  92
  93 long asihpi_hpi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
  94 {
  95         struct hpi_ioctl_linux __user *phpi_ioctl_data;
  96         void __user *puhm;
  97         void __user *puhr;
  98         union hpi_message_buffer_v1 *hm;
  99         union hpi_response_buffer_v1 *hr;
 100         u16 msg_size;
 101         u16 res_max_size;
 102         u32 uncopied_bytes;
 103         int err = 0;
 104
 105         if (cmd != HPI_IOCTL_LINUX)
 106                 return -EINVAL;
 107
 108         hm = kmalloc(sizeof(*hm), GFP_KERNEL);
 109         hr = kzalloc(sizeof(*hr), GFP_KERNEL);
 110         if (!hm || !hr) {
 111                 err = -ENOMEM;
 112                 goto out;
 113         }
 114
 115         phpi_ioctl_data = (struct hpi_ioctl_linux __user *)arg;
 116
 117         /* Read the message and response pointers from user space.  */
 118         if (get_user(puhm, &phpi_ioctl_data->phm)
 119                 || get_user(puhr, &phpi_ioctl_data->phr)) {
 120                 err = -EFAULT;
 121                 goto out;
 122         }
 123
 124         /* Now read the message size and data from user space.  */
 125         if (get_user(msg_size, (u16 __user *)puhm)) {
 126                 err = -EFAULT;
 127                 goto out;
 128         }
 129         if (msg_size > sizeof(*hm))
 130                 msg_size = sizeof(*hm);
 131
 132         /* printk(KERN_INFO "message size %d\n", hm->h.wSize); */
 133
 134         uncopied_bytes = copy_from_user(hm, puhm, msg_size);
 135         if (uncopied_bytes) {
 136                 HPI_DEBUG_LOG(ERROR, "uncopied bytes %d\n", uncopied_bytes);
 137                 err = -EFAULT;
 138                 goto out;
 139         }
 140
 141         /* Override h.size in case it is changed between two userspace fetches */
 142         hm->h.size = msg_size;
 143
 144         if (get_user(res_max_size, (u16 __user *)puhr)) {
 145                 err = -EFAULT;
 146                 goto out;
 147         }
 148         /* printk(KERN_INFO "user response size %d\n", res_max_size); */
 149         if (res_max_size < sizeof(struct hpi_response_header)) {
 150                 HPI_DEBUG_LOG(WARNING, "small res size %d\n", res_max_size);
 151                 err = -EFAULT;
 152                 goto out;
 153         }
 154
 155         res_max_size = min_t(size_t, res_max_size, sizeof(*hr));
 156
 157         switch (hm->h.function) {
 158         case HPI_SUBSYS_CREATE_ADAPTER:
 159         case HPI_ADAPTER_DELETE:
 160                 /* Application must not use these functions! */
 161                 hr->h.size = sizeof(hr->h);
 162                 hr->h.error = HPI_ERROR_INVALID_OPERATION;
 163                 hr->h.function = hm->h.function;
 164                 uncopied_bytes = copy_to_user(puhr, hr, hr->h.size);
 165                 if (uncopied_bytes)
 166                         err = -EFAULT;
 167                 else
 168                         err = 0;
 169                 goto out;
 170         }
 171
 172         hr->h.size = res_max_size;
 173         if (hm->h.object == HPI_OBJ_SUBSYSTEM) {
 174                 hpi_send_recv_f(&hm->m0, &hr->r0, file);
 175         } else {
 176                 u16 __user *ptr = NULL;
 177                 u32 size = 0;
 178                 /* -1=no data 0=read from user mem, 1=write to user mem */
 179                 int wrflag = -1;
 180                 struct hpi_adapter *pa = NULL;
 181
 182                 if (hm->h.adapter_index < ARRAY_SIZE(adapters))
 183                         pa = &adapters[array_index_nospec(hm->h.adapter_index,
 184                                                           ARRAY_SIZE(adapters))];
 185
 186                 if (!pa || !pa->adapter || !pa->adapter->type) {
 187                         hpi_init_response(&hr->r0, hm->h.object,
 188                                 hm->h.function, HPI_ERROR_BAD_ADAPTER_NUMBER);
 189
 190                         uncopied_bytes =
 191                                 copy_to_user(puhr, hr, sizeof(hr->h));
 192                         if (uncopied_bytes)
 193                                 err = -EFAULT;
 194                         else
 195                                 err = 0;
 196                         goto out;
 197                 }
 198
 199                 if (mutex_lock_interruptible(&pa->mutex)) {
 200                         err = -EINTR;
 201                         goto out;
 202                 }
 203
 204                 /* Dig out any pointers embedded in the message.  */
 205                 switch (hm->h.function) {
 206                 case HPI_OSTREAM_WRITE:
 207                 case HPI_ISTREAM_READ:{
 208                                 /* Yes, sparse, this is correct. */
 209                                 ptr = (u16 __user *)hm->m0.u.d.u.data.pb_data;
 210                                 size = hm->m0.u.d.u.data.data_size;
 211
 212                                 /* Allocate buffer according to application request.
 213                                    ?Is it better to alloc/free for the duration
 214                                    of the transaction?
 215                                  */
 216                                 if (pa->buffer_size < size) {
 217                                         HPI_DEBUG_LOG(DEBUG,
 218                                                 "Realloc adapter %d stream "
 219                                                 "buffer from %zd to %d\n",
 220                                                 hm->h.adapter_index,
 221                                                 pa->buffer_size, size);
 222                                         if (pa->p_buffer) {
 223                                                 pa->buffer_size = 0;
 224                                                 vfree(pa->p_buffer);
 225                                         }
 226                                         pa->p_buffer = vmalloc(size);
 227                                         if (pa->p_buffer)
 228                                                 pa->buffer_size = size;
 229                                         else {
 230                                                 HPI_DEBUG_LOG(ERROR,
 231                                                         "HPI could not allocate "
 232                                                         "stream buffer size %d\n",
 233                                                         size);
 234
 235                                                 mutex_unlock(&pa->mutex);
 236                                                 err = -EINVAL;
 237                                                 goto out;
 238                                         }
 239                                 }
 240
 241                                 hm->m0.u.d.u.data.pb_data = pa->p_buffer;
 242                                 if (hm->h.function == HPI_ISTREAM_READ)
 243                                         /* from card, WRITE to user mem */
 244                                         wrflag = 1;
 245                                 else
 246                                         wrflag = 0;
 247                                 break;
 248                         }
 249
 250                 default:
 251                         size = 0;
 252                         break;
 253                 }
 254
 255                 if (size && (wrflag == 0)) {
 256                         uncopied_bytes =
 257                                 copy_from_user(pa->p_buffer, ptr, size);
 258                         if (uncopied_bytes)
 259                                 HPI_DEBUG_LOG(WARNING,
 260                                         "Missed %d of %d "
 261                                         "bytes from user\n", uncopied_bytes,
 262                                         size);
 263                 }
 264
 265                 hpi_send_recv_f(&hm->m0, &hr->r0, file);
 266
 267                 if (size && (wrflag == 1)) {
 268                         uncopied_bytes =
 269                                 copy_to_user(ptr, pa->p_buffer, size);
 270                         if (uncopied_bytes)
 271                                 HPI_DEBUG_LOG(WARNING,
 272                                         "Missed %d of %d " "bytes to user\n",
 273                                         uncopied_bytes, size);
 274                 }
 275
 276                 mutex_unlock(&pa->mutex);
 277         }
 278
 279         /* on return response size must be set */
 280         /*printk(KERN_INFO "response size %d\n", hr->h.wSize); */
 281
 282         if (!hr->h.size) {
 283                 HPI_DEBUG_LOG(ERROR, "response zero size\n");
 284                 err = -EFAULT;
 285                 goto out;
 286         }
 287
 288         if (hr->h.size > res_max_size) {
 289                 HPI_DEBUG_LOG(ERROR, "response too big %d %d\n", hr->h.size,
 290                         res_max_size);
 291                 hr->h.error = HPI_ERROR_RESPONSE_BUFFER_TOO_SMALL;
 292                 hr->h.specific_error = hr->h.size;
 293                 hr->h.size = sizeof(hr->h);
 294         }
 295
 296         uncopied_bytes = copy_to_user(puhr, hr, hr->h.size);
 297         if (uncopied_bytes) {
 298                 HPI_DEBUG_LOG(ERROR, "uncopied bytes %d\n", uncopied_bytes);
 299                 err = -EFAULT;
 300                 goto out;
 301         }
 302
 303 out:
 304         kfree(hm);
 305         kfree(hr);
 306         return err;
 307 }
 308
 309 static int asihpi_irq_count;
 310
 311 static irqreturn_t asihpi_isr(int irq, void *dev_id)
 312 {
 313         struct hpi_adapter *a = dev_id;
 314         int handled;
 315
 316         if (!a->adapter->irq_query_and_clear) {
 317                 pr_err("asihpi_isr ASI%04X:%d no handler\n", a->adapter->type,
 318                         a->adapter->index);
 319                 return IRQ_NONE;
 320         }
 321
 322         handled = a->adapter->irq_query_and_clear(a->adapter, 0);
 323
 324         if (!handled)
 325                 return IRQ_NONE;
 326
 327         asihpi_irq_count++;
 328         /* printk(KERN_INFO "asihpi_isr %d ASI%04X:%d irq handled\n",
 329            asihpi_irq_count, a->adapter->type, a->adapter->index); */
 330
 331         if (a->interrupt_callback)
 332                 return IRQ_WAKE_THREAD;
 333
 334         return IRQ_HANDLED;
 335 }
 336
 337 static irqreturn_t asihpi_isr_thread(int irq, void *dev_id)
 338 {
 339         struct hpi_adapter *a = dev_id;
 340
 341         if (a->interrupt_callback)
 342                 a->interrupt_callback(a);
 343         return IRQ_HANDLED;
 344 }
 345
 346 int asihpi_adapter_probe(struct pci_dev *pci_dev,
 347                          const struct pci_device_id *pci_id)
 348 {
 349         int idx, nm, low_latency_mode = 0, irq_supported = 0;
 350         int adapter_index;
 351         unsigned int memlen;
 352         struct hpi_message hm;
 353         struct hpi_response hr;
 354         struct hpi_adapter adapter;
 355         struct hpi_pci pci = { 0 };
 356
 357         memset(&adapter, 0, sizeof(adapter));
 358
 359         dev_printk(KERN_DEBUG, &pci_dev->dev,
 360                 "probe %04x:%04x,%04x:%04x,%04x\n", pci_dev->vendor,
 361                 pci_dev->device, pci_dev->subsystem_vendor,
 362                 pci_dev->subsystem_device, pci_dev->devfn);
 363
 364         if (pci_enable_device(pci_dev) < 0) {
 365                 dev_err(&pci_dev->dev,
 366                         "pci_enable_device failed, disabling device\n");
 367                 return -EIO;
 368         }
 369
 370         pci_set_master(pci_dev);        /* also sets latency timer if < 16 */
 371
 372         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
 373                 HPI_SUBSYS_CREATE_ADAPTER);
 374         hpi_init_response(&hr, HPI_OBJ_SUBSYSTEM, HPI_SUBSYS_CREATE_ADAPTER,
 375                 HPI_ERROR_PROCESSING_MESSAGE);
 376
 377         hm.adapter_index = HPI_ADAPTER_INDEX_INVALID;
 378
 379         nm = HPI_MAX_ADAPTER_MEM_SPACES;
 380
 381         for (idx = 0; idx < nm; idx++) {
 382                 HPI_DEBUG_LOG(INFO, "resource %d %pR\n", idx,
 383                         &pci_dev->resource[idx]);
 384
 385                 if (pci_resource_flags(pci_dev, idx) & IORESOURCE_MEM) {
 386                         memlen = pci_resource_len(pci_dev, idx);
 387                         pci.ap_mem_base[idx] =
 388                                 ioremap(pci_resource_start(pci_dev, idx),
 389                                 memlen);
 390                         if (!pci.ap_mem_base[idx]) {
 391                                 HPI_DEBUG_LOG(ERROR,
 392                                         "ioremap failed, aborting\n");
 393                                 /* unmap previously mapped pci mem space */
 394                                 goto err;
 395                         }
 396                 }
 397         }
 398
 399         pci.pci_dev = pci_dev;
 400         hm.u.s.resource.bus_type = HPI_BUS_PCI;
 401         hm.u.s.resource.r.pci = &pci;
 402
 403         /* call CreateAdapterObject on the relevant hpi module */
 404         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 405         if (hr.error)
 406                 goto err;
 407
 408         adapter_index = hr.u.s.adapter_index;
 409         adapter.adapter = hpi_find_adapter(adapter_index);
 410
 411         if (prealloc_stream_buf) {
 412                 adapter.p_buffer = vmalloc(prealloc_stream_buf);
 413                 if (!adapter.p_buffer) {
 414                         HPI_DEBUG_LOG(ERROR,
 415                                 "HPI could not allocate "
 416                                 "kernel buffer size %d\n",
 417                                 prealloc_stream_buf);
 418                         goto err;
 419                 }
 420         }
 421
 422         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 423                 HPI_ADAPTER_OPEN);
 424         hm.adapter_index = adapter.adapter->index;
 425         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 426
 427         if (hr.error) {
 428                 HPI_DEBUG_LOG(ERROR, "HPI_ADAPTER_OPEN failed, aborting\n");
 429                 goto err;
 430         }
 431
 432         /* Check if current mode == Low Latency mode */
 433         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 434                 HPI_ADAPTER_GET_MODE);
 435         hm.adapter_index = adapter.adapter->index;
 436         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 437
 438         if (!hr.error
 439                 && hr.u.ax.mode.adapter_mode == HPI_ADAPTER_MODE_LOW_LATENCY)
 440                 low_latency_mode = 1;
 441         else
 442                 dev_info(&pci_dev->dev,
 443                         "Adapter at index %d is not in low latency mode\n",
 444                         adapter.adapter->index);
 445
 446         /* Check if IRQs are supported */
 447         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 448                 HPI_ADAPTER_GET_PROPERTY);
 449         hm.adapter_index = adapter.adapter->index;
 450         hm.u.ax.property_set.property = HPI_ADAPTER_PROPERTY_SUPPORTS_IRQ;
 451         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 452         if (hr.error || !hr.u.ax.property_get.parameter1) {
 453                 dev_info(&pci_dev->dev,
 454                         "IRQs not supported by adapter at index %d\n",
 455                         adapter.adapter->index);
 456         } else {
 457                 irq_supported = 1;
 458         }
 459
 460         /* WARNING can't init mutex in 'adapter'
 461          * and then copy it to adapters[] ?!?!
 462          */
 463         adapters[adapter_index] = adapter;
 464         mutex_init(&adapters[adapter_index].mutex);
 465         pci_set_drvdata(pci_dev, &adapters[adapter_index]);
 466
 467         if (low_latency_mode && irq_supported) {
 468                 if (!adapter.adapter->irq_query_and_clear) {
 469                         dev_err(&pci_dev->dev,
 470                                 "no IRQ handler for adapter %d, aborting\n",
 471                                 adapter.adapter->index);
 472                         goto err;
 473                 }
 474
 475                 /* Disable IRQ generation on DSP side by setting the rate to 0 */
 476                 hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 477                         HPI_ADAPTER_SET_PROPERTY);
 478                 hm.adapter_index = adapter.adapter->index;
 479                 hm.u.ax.property_set.property = HPI_ADAPTER_PROPERTY_IRQ_RATE;
 480                 hm.u.ax.property_set.parameter1 = 0;
 481                 hm.u.ax.property_set.parameter2 = 0;
 482                 hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 483                 if (hr.error) {
 484                         HPI_DEBUG_LOG(ERROR,
 485                                 "HPI_ADAPTER_GET_MODE failed, aborting\n");
 486                         goto err;
 487                 }
 488
 489                 /* Note: request_irq calls asihpi_isr here */
 490                 if (request_threaded_irq(pci_dev->irq, asihpi_isr,
 491                                          asihpi_isr_thread, IRQF_SHARED,
 492                                          "asihpi", &adapters[adapter_index])) {
 493                         dev_err(&pci_dev->dev, "request_irq(%d) failed\n",
 494                                 pci_dev->irq);
 495                         goto err;
 496                 }
 497
 498                 adapters[adapter_index].interrupt_mode = 1;
 499
 500                 dev_info(&pci_dev->dev, "using irq %d\n", pci_dev->irq);
 501                 adapters[adapter_index].irq = pci_dev->irq;
 502         } else {
 503                 dev_info(&pci_dev->dev, "using polled mode\n");
 504         }
 505
 506         dev_info(&pci_dev->dev, "probe succeeded for ASI%04X HPI index %d\n",
 507                  adapter.adapter->type, adapter_index);
 508
 509         return 0;
 510
 511 err:
 512         while (--idx >= 0) {
 513                 if (pci.ap_mem_base[idx]) {
 514                         iounmap(pci.ap_mem_base[idx]);
 515                         pci.ap_mem_base[idx] = NULL;
 516                 }
 517         }
 518
 519         if (adapter.p_buffer) {
 520                 adapter.buffer_size = 0;
 521                 vfree(adapter.p_buffer);
 522         }
 523
 524         HPI_DEBUG_LOG(ERROR, "adapter_probe failed\n");
 525         return -ENODEV;
 526 }
 527
 528 void asihpi_adapter_remove(struct pci_dev *pci_dev)
 529 {
 530         int idx;
 531         struct hpi_message hm;
 532         struct hpi_response hr;
 533         struct hpi_adapter *pa;
 534         struct hpi_pci pci;
 535
 536         pa = pci_get_drvdata(pci_dev);
 537         pci = pa->adapter->pci;
 538
 539         /* Disable IRQ generation on DSP side */
 540         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 541                 HPI_ADAPTER_SET_PROPERTY);
 542         hm.adapter_index = pa->adapter->index;
 543         hm.u.ax.property_set.property = HPI_ADAPTER_PROPERTY_IRQ_RATE;
 544         hm.u.ax.property_set.parameter1 = 0;
 545         hm.u.ax.property_set.parameter2 = 0;
 546         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 547
 548         hpi_init_message_response(&hm, &hr, HPI_OBJ_ADAPTER,
 549                 HPI_ADAPTER_DELETE);
 550         hm.adapter_index = pa->adapter->index;
 551         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 552
 553         /* unmap PCI memory space, mapped during device init. */
 554         for (idx = 0; idx < HPI_MAX_ADAPTER_MEM_SPACES; ++idx)
 555                 iounmap(pci.ap_mem_base[idx]);
 556
 557         if (pa->irq)
 558                 free_irq(pa->irq, pa);
 559
 560         vfree(pa->p_buffer);
 561
 562         if (1)
 563                 dev_info(&pci_dev->dev,
 564                          "remove %04x:%04x,%04x:%04x,%04x, HPI index %d\n",
 565                          pci_dev->vendor, pci_dev->device,
 566                          pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 567                          pci_dev->devfn, pa->adapter->index);
 568
 569         memset(pa, 0, sizeof(*pa));
 570 }
 571
 572 void __init asihpi_init(void)
 573 {
 574         struct hpi_message hm;
 575         struct hpi_response hr;
 576
 577         memset(adapters, 0, sizeof(adapters));
 578
 579         printk(KERN_INFO "ASIHPI driver " HPI_VER_STRING "\n");
 580
 581         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
 582                 HPI_SUBSYS_DRIVER_LOAD);
 583         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 584 }
 585
 586 void asihpi_exit(void)
 587 {
 588         struct hpi_message hm;
 589         struct hpi_response hr;
 590
 591         hpi_init_message_response(&hm, &hr, HPI_OBJ_SUBSYSTEM,
 592                 HPI_SUBSYS_DRIVER_UNLOAD);
 593         hpi_send_recv_ex(&hm, &hr, HOWNER_KERNEL);
 594 }