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Linux/sound/pci/asihpi/hpioctl.c

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  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 }
595 

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