1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
3
4#include <linux/kernel.h>
5#include <linux/nospec.h>
6#include "cc_driver.h"
7#include "cc_buffer_mgr.h"
8#include "cc_request_mgr.h"
9#include "cc_pm.h"
10
11#define CC_MAX_POLL_ITER 10
12/* The highest descriptor count in used */
13#define CC_MAX_DESC_SEQ_LEN 23
14
15struct cc_req_mgr_handle {
16 /* Request manager resources */
17 unsigned int hw_queue_size; /* HW capability */
18 unsigned int min_free_hw_slots;
19 unsigned int max_used_sw_slots;
20 struct cc_crypto_req req_queue[MAX_REQUEST_QUEUE_SIZE];
21 u32 req_queue_head;
22 u32 req_queue_tail;
23 u32 axi_completed;
24 u32 q_free_slots;
25 /* This lock protects access to HW register
26 * that must be single request at a time
27 */
28 spinlock_t hw_lock;
29 struct cc_hw_desc compl_desc;
30 u8 *dummy_comp_buff;
31 dma_addr_t dummy_comp_buff_dma;
32
33 /* backlog queue */
34 struct list_head backlog;
35 unsigned int bl_len;
36 spinlock_t bl_lock; /* protect backlog queue */
37
38#ifdef COMP_IN_WQ
39 struct workqueue_struct *workq;
40 struct delayed_work compwork;
41#else
42 struct tasklet_struct comptask;
43#endif
44};
45
46struct cc_bl_item {
47 struct cc_crypto_req creq;
48 struct cc_hw_desc desc[CC_MAX_DESC_SEQ_LEN];
49 unsigned int len;
50 struct list_head list;
51 bool notif;
52};
53
54static const u32 cc_cpp_int_masks[CC_CPP_NUM_ALGS][CC_CPP_NUM_SLOTS] = {
55 { BIT(CC_HOST_IRR_REE_OP_ABORTED_AES_0_INT_BIT_SHIFT),
56 BIT(CC_HOST_IRR_REE_OP_ABORTED_AES_1_INT_BIT_SHIFT),
57 BIT(CC_HOST_IRR_REE_OP_ABORTED_AES_2_INT_BIT_SHIFT),
58 BIT(CC_HOST_IRR_REE_OP_ABORTED_AES_3_INT_BIT_SHIFT),
59 BIT(CC_HOST_IRR_REE_OP_ABORTED_AES_4_INT_BIT_SHIFT),
60 BIT(CC_HOST_IRR_REE_OP_ABORTED_AES_5_INT_BIT_SHIFT),
61 BIT(CC_HOST_IRR_REE_OP_ABORTED_AES_6_INT_BIT_SHIFT),
62 BIT(CC_HOST_IRR_REE_OP_ABORTED_AES_7_INT_BIT_SHIFT) },
63 { BIT(CC_HOST_IRR_REE_OP_ABORTED_SM_0_INT_BIT_SHIFT),
64 BIT(CC_HOST_IRR_REE_OP_ABORTED_SM_1_INT_BIT_SHIFT),
65 BIT(CC_HOST_IRR_REE_OP_ABORTED_SM_2_INT_BIT_SHIFT),
66 BIT(CC_HOST_IRR_REE_OP_ABORTED_SM_3_INT_BIT_SHIFT),
67 BIT(CC_HOST_IRR_REE_OP_ABORTED_SM_4_INT_BIT_SHIFT),
68 BIT(CC_HOST_IRR_REE_OP_ABORTED_SM_5_INT_BIT_SHIFT),
69 BIT(CC_HOST_IRR_REE_OP_ABORTED_SM_6_INT_BIT_SHIFT),
70 BIT(CC_HOST_IRR_REE_OP_ABORTED_SM_7_INT_BIT_SHIFT) }
71};
72
73static void comp_handler(unsigned long devarg);
74#ifdef COMP_IN_WQ
75static void comp_work_handler(struct work_struct *work);
76#endif
77
78static inline u32 cc_cpp_int_mask(enum cc_cpp_alg alg, int slot)
79{
80 alg = array_index_nospec(alg, CC_CPP_NUM_ALGS);
81 slot = array_index_nospec(slot, CC_CPP_NUM_SLOTS);
82
83 return cc_cpp_int_masks[alg][slot];
84}
85
86void cc_req_mgr_fini(struct cc_drvdata *drvdata)
87{
88 struct cc_req_mgr_handle *req_mgr_h = drvdata->request_mgr_handle;
89 struct device *dev = drvdata_to_dev(drvdata);
90
91 if (!req_mgr_h)
92 return; /* Not allocated */
93
94 if (req_mgr_h->dummy_comp_buff_dma) {
95 dma_free_coherent(dev, size: sizeof(u32), cpu_addr: req_mgr_h->dummy_comp_buff,
96 dma_handle: req_mgr_h->dummy_comp_buff_dma);
97 }
98
99 dev_dbg(dev, "max_used_hw_slots=%d\n", (req_mgr_h->hw_queue_size -
100 req_mgr_h->min_free_hw_slots));
101 dev_dbg(dev, "max_used_sw_slots=%d\n", req_mgr_h->max_used_sw_slots);
102
103#ifdef COMP_IN_WQ
104 destroy_workqueue(req_mgr_h->workq);
105#else
106 /* Kill tasklet */
107 tasklet_kill(t: &req_mgr_h->comptask);
108#endif
109 kfree_sensitive(objp: req_mgr_h);
110 drvdata->request_mgr_handle = NULL;
111}
112
113int cc_req_mgr_init(struct cc_drvdata *drvdata)
114{
115 struct cc_req_mgr_handle *req_mgr_h;
116 struct device *dev = drvdata_to_dev(drvdata);
117 int rc = 0;
118
119 req_mgr_h = kzalloc(size: sizeof(*req_mgr_h), GFP_KERNEL);
120 if (!req_mgr_h) {
121 rc = -ENOMEM;
122 goto req_mgr_init_err;
123 }
124
125 drvdata->request_mgr_handle = req_mgr_h;
126
127 spin_lock_init(&req_mgr_h->hw_lock);
128 spin_lock_init(&req_mgr_h->bl_lock);
129 INIT_LIST_HEAD(list: &req_mgr_h->backlog);
130
131#ifdef COMP_IN_WQ
132 dev_dbg(dev, "Initializing completion workqueue\n");
133 req_mgr_h->workq = create_singlethread_workqueue("ccree");
134 if (!req_mgr_h->workq) {
135 dev_err(dev, "Failed creating work queue\n");
136 rc = -ENOMEM;
137 goto req_mgr_init_err;
138 }
139 INIT_DELAYED_WORK(&req_mgr_h->compwork, comp_work_handler);
140#else
141 dev_dbg(dev, "Initializing completion tasklet\n");
142 tasklet_init(t: &req_mgr_h->comptask, func: comp_handler,
143 data: (unsigned long)drvdata);
144#endif
145 req_mgr_h->hw_queue_size = cc_ioread(drvdata,
146 CC_REG(DSCRPTR_QUEUE_SRAM_SIZE));
147 dev_dbg(dev, "hw_queue_size=0x%08X\n", req_mgr_h->hw_queue_size);
148 if (req_mgr_h->hw_queue_size < MIN_HW_QUEUE_SIZE) {
149 dev_err(dev, "Invalid HW queue size = %u (Min. required is %u)\n",
150 req_mgr_h->hw_queue_size, MIN_HW_QUEUE_SIZE);
151 rc = -ENOMEM;
152 goto req_mgr_init_err;
153 }
154 req_mgr_h->min_free_hw_slots = req_mgr_h->hw_queue_size;
155 req_mgr_h->max_used_sw_slots = 0;
156
157 /* Allocate DMA word for "dummy" completion descriptor use */
158 req_mgr_h->dummy_comp_buff =
159 dma_alloc_coherent(dev, size: sizeof(u32),
160 dma_handle: &req_mgr_h->dummy_comp_buff_dma,
161 GFP_KERNEL);
162 if (!req_mgr_h->dummy_comp_buff) {
163 dev_err(dev, "Not enough memory to allocate DMA (%zu) dropped buffer\n",
164 sizeof(u32));
165 rc = -ENOMEM;
166 goto req_mgr_init_err;
167 }
168
169 /* Init. "dummy" completion descriptor */
170 hw_desc_init(pdesc: &req_mgr_h->compl_desc);
171 set_din_const(pdesc: &req_mgr_h->compl_desc, val: 0, size: sizeof(u32));
172 set_dout_dlli(pdesc: &req_mgr_h->compl_desc, addr: req_mgr_h->dummy_comp_buff_dma,
173 size: sizeof(u32), NS_BIT, last_ind: 1);
174 set_flow_mode(pdesc: &req_mgr_h->compl_desc, mode: BYPASS);
175 set_queue_last_ind(drvdata, pdesc: &req_mgr_h->compl_desc);
176
177 return 0;
178
179req_mgr_init_err:
180 cc_req_mgr_fini(drvdata);
181 return rc;
182}
183
184static void enqueue_seq(struct cc_drvdata *drvdata, struct cc_hw_desc seq[],
185 unsigned int seq_len)
186{
187 int i, w;
188 void __iomem *reg = drvdata->cc_base + CC_REG(DSCRPTR_QUEUE_WORD0);
189 struct device *dev = drvdata_to_dev(drvdata);
190
191 /*
192 * We do indeed write all 6 command words to the same
193 * register. The HW supports this.
194 */
195
196 for (i = 0; i < seq_len; i++) {
197 for (w = 0; w <= 5; w++)
198 writel_relaxed(seq[i].word[w], reg);
199
200 if (cc_dump_desc)
201 dev_dbg(dev, "desc[%02d]: 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X\n",
202 i, seq[i].word[0], seq[i].word[1],
203 seq[i].word[2], seq[i].word[3],
204 seq[i].word[4], seq[i].word[5]);
205 }
206}
207
208/**
209 * request_mgr_complete() - Completion will take place if and only if user
210 * requested completion by cc_send_sync_request().
211 *
212 * @dev: Device pointer
213 * @dx_compl_h: The completion event to signal
214 * @dummy: unused error code
215 */
216static void request_mgr_complete(struct device *dev, void *dx_compl_h,
217 int dummy)
218{
219 struct completion *this_compl = dx_compl_h;
220
221 complete(this_compl);
222}
223
224static int cc_queues_status(struct cc_drvdata *drvdata,
225 struct cc_req_mgr_handle *req_mgr_h,
226 unsigned int total_seq_len)
227{
228 unsigned long poll_queue;
229 struct device *dev = drvdata_to_dev(drvdata);
230
231 /* SW queue is checked only once as it will not
232 * be changed during the poll because the spinlock_bh
233 * is held by the thread
234 */
235 if (((req_mgr_h->req_queue_head + 1) & (MAX_REQUEST_QUEUE_SIZE - 1)) ==
236 req_mgr_h->req_queue_tail) {
237 dev_err(dev, "SW FIFO is full. req_queue_head=%d sw_fifo_len=%d\n",
238 req_mgr_h->req_queue_head, MAX_REQUEST_QUEUE_SIZE);
239 return -ENOSPC;
240 }
241
242 if (req_mgr_h->q_free_slots >= total_seq_len)
243 return 0;
244
245 /* Wait for space in HW queue. Poll constant num of iterations. */
246 for (poll_queue = 0; poll_queue < CC_MAX_POLL_ITER ; poll_queue++) {
247 req_mgr_h->q_free_slots =
248 cc_ioread(drvdata, CC_REG(DSCRPTR_QUEUE_CONTENT));
249 if (req_mgr_h->q_free_slots < req_mgr_h->min_free_hw_slots)
250 req_mgr_h->min_free_hw_slots = req_mgr_h->q_free_slots;
251
252 if (req_mgr_h->q_free_slots >= total_seq_len) {
253 /* If there is enough place return */
254 return 0;
255 }
256
257 dev_dbg(dev, "HW FIFO is full. q_free_slots=%d total_seq_len=%d\n",
258 req_mgr_h->q_free_slots, total_seq_len);
259 }
260 /* No room in the HW queue try again later */
261 dev_dbg(dev, "HW FIFO full, timeout. req_queue_head=%d sw_fifo_len=%d q_free_slots=%d total_seq_len=%d\n",
262 req_mgr_h->req_queue_head, MAX_REQUEST_QUEUE_SIZE,
263 req_mgr_h->q_free_slots, total_seq_len);
264 return -ENOSPC;
265}
266
267/**
268 * cc_do_send_request() - Enqueue caller request to crypto hardware.
269 * Need to be called with HW lock held and PM running
270 *
271 * @drvdata: Associated device driver context
272 * @cc_req: The request to enqueue
273 * @desc: The crypto sequence
274 * @len: The crypto sequence length
275 * @add_comp: If "true": add an artificial dout DMA to mark completion
276 *
277 */
278static void cc_do_send_request(struct cc_drvdata *drvdata,
279 struct cc_crypto_req *cc_req,
280 struct cc_hw_desc *desc, unsigned int len,
281 bool add_comp)
282{
283 struct cc_req_mgr_handle *req_mgr_h = drvdata->request_mgr_handle;
284 unsigned int used_sw_slots;
285 unsigned int total_seq_len = len; /*initial sequence length*/
286 struct device *dev = drvdata_to_dev(drvdata);
287
288 used_sw_slots = ((req_mgr_h->req_queue_head -
289 req_mgr_h->req_queue_tail) &
290 (MAX_REQUEST_QUEUE_SIZE - 1));
291 if (used_sw_slots > req_mgr_h->max_used_sw_slots)
292 req_mgr_h->max_used_sw_slots = used_sw_slots;
293
294 /* Enqueue request - must be locked with HW lock*/
295 req_mgr_h->req_queue[req_mgr_h->req_queue_head] = *cc_req;
296 req_mgr_h->req_queue_head = (req_mgr_h->req_queue_head + 1) &
297 (MAX_REQUEST_QUEUE_SIZE - 1);
298
299 dev_dbg(dev, "Enqueue request head=%u\n", req_mgr_h->req_queue_head);
300
301 /*
302 * We are about to push command to the HW via the command registers
303 * that may reference host memory. We need to issue a memory barrier
304 * to make sure there are no outstanding memory writes
305 */
306 wmb();
307
308 /* STAT_PHASE_4: Push sequence */
309
310 enqueue_seq(drvdata, seq: desc, seq_len: len);
311
312 if (add_comp) {
313 enqueue_seq(drvdata, seq: &req_mgr_h->compl_desc, seq_len: 1);
314 total_seq_len++;
315 }
316
317 if (req_mgr_h->q_free_slots < total_seq_len) {
318 /* This situation should never occur. Maybe indicating problem
319 * with resuming power. Set the free slot count to 0 and hope
320 * for the best.
321 */
322 dev_err(dev, "HW free slot count mismatch.");
323 req_mgr_h->q_free_slots = 0;
324 } else {
325 /* Update the free slots in HW queue */
326 req_mgr_h->q_free_slots -= total_seq_len;
327 }
328}
329
330static void cc_enqueue_backlog(struct cc_drvdata *drvdata,
331 struct cc_bl_item *bli)
332{
333 struct cc_req_mgr_handle *mgr = drvdata->request_mgr_handle;
334 struct device *dev = drvdata_to_dev(drvdata);
335
336 spin_lock_bh(lock: &mgr->bl_lock);
337 list_add_tail(new: &bli->list, head: &mgr->backlog);
338 ++mgr->bl_len;
339 dev_dbg(dev, "+++bl len: %d\n", mgr->bl_len);
340 spin_unlock_bh(lock: &mgr->bl_lock);
341 tasklet_schedule(t: &mgr->comptask);
342}
343
344static void cc_proc_backlog(struct cc_drvdata *drvdata)
345{
346 struct cc_req_mgr_handle *mgr = drvdata->request_mgr_handle;
347 struct cc_bl_item *bli;
348 struct cc_crypto_req *creq;
349 void *req;
350 struct device *dev = drvdata_to_dev(drvdata);
351 int rc;
352
353 spin_lock(lock: &mgr->bl_lock);
354
355 while (mgr->bl_len) {
356 bli = list_first_entry(&mgr->backlog, struct cc_bl_item, list);
357 dev_dbg(dev, "---bl len: %d\n", mgr->bl_len);
358
359 spin_unlock(lock: &mgr->bl_lock);
360
361
362 creq = &bli->creq;
363 req = creq->user_arg;
364
365 /*
366 * Notify the request we're moving out of the backlog
367 * but only if we haven't done so already.
368 */
369 if (!bli->notif) {
370 creq->user_cb(dev, req, -EINPROGRESS);
371 bli->notif = true;
372 }
373
374 spin_lock(lock: &mgr->hw_lock);
375
376 rc = cc_queues_status(drvdata, req_mgr_h: mgr, total_seq_len: bli->len);
377 if (rc) {
378 /*
379 * There is still no room in the FIFO for
380 * this request. Bail out. We'll return here
381 * on the next completion irq.
382 */
383 spin_unlock(lock: &mgr->hw_lock);
384 return;
385 }
386
387 cc_do_send_request(drvdata, cc_req: &bli->creq, desc: bli->desc, len: bli->len,
388 add_comp: false);
389 spin_unlock(lock: &mgr->hw_lock);
390
391 /* Remove ourselves from the backlog list */
392 spin_lock(lock: &mgr->bl_lock);
393 list_del(entry: &bli->list);
394 --mgr->bl_len;
395 kfree(objp: bli);
396 }
397
398 spin_unlock(lock: &mgr->bl_lock);
399}
400
401int cc_send_request(struct cc_drvdata *drvdata, struct cc_crypto_req *cc_req,
402 struct cc_hw_desc *desc, unsigned int len,
403 struct crypto_async_request *req)
404{
405 int rc;
406 struct cc_req_mgr_handle *mgr = drvdata->request_mgr_handle;
407 struct device *dev = drvdata_to_dev(drvdata);
408 bool backlog_ok = req->flags & CRYPTO_TFM_REQ_MAY_BACKLOG;
409 gfp_t flags = cc_gfp_flags(req);
410 struct cc_bl_item *bli;
411
412 rc = cc_pm_get(dev);
413 if (rc) {
414 dev_err(dev, "cc_pm_get returned %x\n", rc);
415 return rc;
416 }
417
418 spin_lock_bh(lock: &mgr->hw_lock);
419 rc = cc_queues_status(drvdata, req_mgr_h: mgr, total_seq_len: len);
420
421#ifdef CC_DEBUG_FORCE_BACKLOG
422 if (backlog_ok)
423 rc = -ENOSPC;
424#endif /* CC_DEBUG_FORCE_BACKLOG */
425
426 if (rc == -ENOSPC && backlog_ok) {
427 spin_unlock_bh(lock: &mgr->hw_lock);
428
429 bli = kmalloc(size: sizeof(*bli), flags);
430 if (!bli) {
431 cc_pm_put_suspend(dev);
432 return -ENOMEM;
433 }
434
435 memcpy(&bli->creq, cc_req, sizeof(*cc_req));
436 memcpy(&bli->desc, desc, len * sizeof(*desc));
437 bli->len = len;
438 bli->notif = false;
439 cc_enqueue_backlog(drvdata, bli);
440 return -EBUSY;
441 }
442
443 if (!rc) {
444 cc_do_send_request(drvdata, cc_req, desc, len, add_comp: false);
445 rc = -EINPROGRESS;
446 }
447
448 spin_unlock_bh(lock: &mgr->hw_lock);
449 return rc;
450}
451
452int cc_send_sync_request(struct cc_drvdata *drvdata,
453 struct cc_crypto_req *cc_req, struct cc_hw_desc *desc,
454 unsigned int len)
455{
456 int rc;
457 struct device *dev = drvdata_to_dev(drvdata);
458 struct cc_req_mgr_handle *mgr = drvdata->request_mgr_handle;
459
460 init_completion(x: &cc_req->seq_compl);
461 cc_req->user_cb = request_mgr_complete;
462 cc_req->user_arg = &cc_req->seq_compl;
463
464 rc = cc_pm_get(dev);
465 if (rc) {
466 dev_err(dev, "cc_pm_get returned %x\n", rc);
467 return rc;
468 }
469
470 while (true) {
471 spin_lock_bh(lock: &mgr->hw_lock);
472 rc = cc_queues_status(drvdata, req_mgr_h: mgr, total_seq_len: len + 1);
473
474 if (!rc)
475 break;
476
477 spin_unlock_bh(lock: &mgr->hw_lock);
478 wait_for_completion_interruptible(x: &drvdata->hw_queue_avail);
479 reinit_completion(x: &drvdata->hw_queue_avail);
480 }
481
482 cc_do_send_request(drvdata, cc_req, desc, len, add_comp: true);
483 spin_unlock_bh(lock: &mgr->hw_lock);
484 wait_for_completion(&cc_req->seq_compl);
485 return 0;
486}
487
488/**
489 * send_request_init() - Enqueue caller request to crypto hardware during init
490 * process.
491 * Assume this function is not called in the middle of a flow,
492 * since we set QUEUE_LAST_IND flag in the last descriptor.
493 *
494 * @drvdata: Associated device driver context
495 * @desc: The crypto sequence
496 * @len: The crypto sequence length
497 *
498 * Return:
499 * Returns "0" upon success
500 */
501int send_request_init(struct cc_drvdata *drvdata, struct cc_hw_desc *desc,
502 unsigned int len)
503{
504 struct cc_req_mgr_handle *req_mgr_h = drvdata->request_mgr_handle;
505 unsigned int total_seq_len = len; /*initial sequence length*/
506 int rc = 0;
507
508 /* Wait for space in HW and SW FIFO. Poll for as much as FIFO_TIMEOUT.
509 */
510 rc = cc_queues_status(drvdata, req_mgr_h, total_seq_len);
511 if (rc)
512 return rc;
513
514 set_queue_last_ind(drvdata, pdesc: &desc[(len - 1)]);
515
516 /*
517 * We are about to push command to the HW via the command registers
518 * that may reference host memory. We need to issue a memory barrier
519 * to make sure there are no outstanding memory writes
520 */
521 wmb();
522 enqueue_seq(drvdata, seq: desc, seq_len: len);
523
524 /* Update the free slots in HW queue */
525 req_mgr_h->q_free_slots =
526 cc_ioread(drvdata, CC_REG(DSCRPTR_QUEUE_CONTENT));
527
528 return 0;
529}
530
531void complete_request(struct cc_drvdata *drvdata)
532{
533 struct cc_req_mgr_handle *request_mgr_handle =
534 drvdata->request_mgr_handle;
535
536 complete(&drvdata->hw_queue_avail);
537#ifdef COMP_IN_WQ
538 queue_delayed_work(request_mgr_handle->workq,
539 &request_mgr_handle->compwork, 0);
540#else
541 tasklet_schedule(t: &request_mgr_handle->comptask);
542#endif
543}
544
545#ifdef COMP_IN_WQ
546static void comp_work_handler(struct work_struct *work)
547{
548 struct cc_drvdata *drvdata =
549 container_of(work, struct cc_drvdata, compwork.work);
550
551 comp_handler((unsigned long)drvdata);
552}
553#endif
554
555static void proc_completions(struct cc_drvdata *drvdata)
556{
557 struct cc_crypto_req *cc_req;
558 struct device *dev = drvdata_to_dev(drvdata);
559 struct cc_req_mgr_handle *request_mgr_handle =
560 drvdata->request_mgr_handle;
561 unsigned int *tail = &request_mgr_handle->req_queue_tail;
562 unsigned int *head = &request_mgr_handle->req_queue_head;
563 int rc;
564 u32 mask;
565
566 while (request_mgr_handle->axi_completed) {
567 request_mgr_handle->axi_completed--;
568
569 /* Dequeue request */
570 if (*head == *tail) {
571 /* We are supposed to handle a completion but our
572 * queue is empty. This is not normal. Return and
573 * hope for the best.
574 */
575 dev_err(dev, "Request queue is empty head == tail %u\n",
576 *head);
577 break;
578 }
579
580 cc_req = &request_mgr_handle->req_queue[*tail];
581
582 if (cc_req->cpp.is_cpp) {
583
584 dev_dbg(dev, "CPP request completion slot: %d alg:%d\n",
585 cc_req->cpp.slot, cc_req->cpp.alg);
586 mask = cc_cpp_int_mask(alg: cc_req->cpp.alg,
587 slot: cc_req->cpp.slot);
588 rc = (drvdata->irq & mask ? -EPERM : 0);
589 dev_dbg(dev, "Got mask: %x irq: %x rc: %d\n", mask,
590 drvdata->irq, rc);
591 } else {
592 dev_dbg(dev, "None CPP request completion\n");
593 rc = 0;
594 }
595
596 if (cc_req->user_cb)
597 cc_req->user_cb(dev, cc_req->user_arg, rc);
598 *tail = (*tail + 1) & (MAX_REQUEST_QUEUE_SIZE - 1);
599 dev_dbg(dev, "Dequeue request tail=%u\n", *tail);
600 dev_dbg(dev, "Request completed. axi_completed=%d\n",
601 request_mgr_handle->axi_completed);
602 cc_pm_put_suspend(dev);
603 }
604}
605
606static inline u32 cc_axi_comp_count(struct cc_drvdata *drvdata)
607{
608 return FIELD_GET(AXIM_MON_COMP_VALUE,
609 cc_ioread(drvdata, drvdata->axim_mon_offset));
610}
611
612/* Deferred service handler, run as interrupt-fired tasklet */
613static void comp_handler(unsigned long devarg)
614{
615 struct cc_drvdata *drvdata = (struct cc_drvdata *)devarg;
616 struct cc_req_mgr_handle *request_mgr_handle =
617 drvdata->request_mgr_handle;
618 struct device *dev = drvdata_to_dev(drvdata);
619 u32 irq;
620
621 dev_dbg(dev, "Completion handler called!\n");
622 irq = (drvdata->irq & drvdata->comp_mask);
623
624 /* To avoid the interrupt from firing as we unmask it,
625 * we clear it now
626 */
627 cc_iowrite(drvdata, CC_REG(HOST_ICR), val: irq);
628
629 /* Avoid race with above clear: Test completion counter once more */
630
631 request_mgr_handle->axi_completed += cc_axi_comp_count(drvdata);
632
633 dev_dbg(dev, "AXI completion after updated: %d\n",
634 request_mgr_handle->axi_completed);
635
636 while (request_mgr_handle->axi_completed) {
637 do {
638 drvdata->irq |= cc_ioread(drvdata, CC_REG(HOST_IRR));
639 irq = (drvdata->irq & drvdata->comp_mask);
640 proc_completions(drvdata);
641
642 /* At this point (after proc_completions()),
643 * request_mgr_handle->axi_completed is 0.
644 */
645 request_mgr_handle->axi_completed +=
646 cc_axi_comp_count(drvdata);
647 } while (request_mgr_handle->axi_completed > 0);
648
649 cc_iowrite(drvdata, CC_REG(HOST_ICR), val: irq);
650
651 request_mgr_handle->axi_completed += cc_axi_comp_count(drvdata);
652 }
653
654 /* after verifying that there is nothing to do,
655 * unmask AXI completion interrupt
656 */
657 cc_iowrite(drvdata, CC_REG(HOST_IMR),
658 val: cc_ioread(drvdata, CC_REG(HOST_IMR)) & ~drvdata->comp_mask);
659
660 cc_proc_backlog(drvdata);
661 dev_dbg(dev, "Comp. handler done.\n");
662}
663

source code of linux/drivers/crypto/ccree/cc_request_mgr.c