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