1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright 2020-2021 NXP
4  */
5 
6 #include <linux/init.h>
7 #include <linux/interconnect.h>
8 #include <linux/ioctl.h>
9 #include <linux/list.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/slab.h>
14 #include <linux/types.h>
15 #include <linux/delay.h>
16 #include <linux/vmalloc.h>
17 #include "vpu.h"
18 #include "vpu_defs.h"
19 #include "vpu_cmds.h"
20 #include "vpu_rpc.h"
21 #include "vpu_mbox.h"
22 
23 struct vpu_cmd_request {
24 	u32 request;
25 	u32 response;
26 	u32 handled;
27 };
28 
29 struct vpu_cmd_t {
30 	struct list_head list;
31 	u32 id;
32 	struct vpu_cmd_request *request;
33 	struct vpu_rpc_event *pkt;
34 	unsigned long key;
35 };
36 
37 static struct vpu_cmd_request vpu_cmd_requests[] = {
38 	{
39 		.request = VPU_CMD_ID_CONFIGURE_CODEC,
40 		.response = VPU_MSG_ID_MEM_REQUEST,
41 		.handled = 1,
42 	},
43 	{
44 		.request = VPU_CMD_ID_START,
45 		.response = VPU_MSG_ID_START_DONE,
46 		.handled = 0,
47 	},
48 	{
49 		.request = VPU_CMD_ID_STOP,
50 		.response = VPU_MSG_ID_STOP_DONE,
51 		.handled = 0,
52 	},
53 	{
54 		.request = VPU_CMD_ID_ABORT,
55 		.response = VPU_MSG_ID_ABORT_DONE,
56 		.handled = 0,
57 	},
58 	{
59 		.request = VPU_CMD_ID_RST_BUF,
60 		.response = VPU_MSG_ID_BUF_RST,
61 		.handled = 1,
62 	},
63 };
64 
65 static int vpu_cmd_send(struct vpu_core *core, struct vpu_rpc_event *pkt)
66 {
67 	int ret = 0;
68 
69 	ret = vpu_iface_send_cmd(core, pkt);
70 	if (ret)
71 		return ret;
72 
73 	/*write cmd data to cmd buffer before trigger a cmd interrupt*/
74 	mb();
75 	vpu_mbox_send_type(core, COMMAND);
76 
77 	return ret;
78 }
79 
80 static struct vpu_cmd_t *vpu_alloc_cmd(struct vpu_inst *inst, u32 id, void *data)
81 {
82 	struct vpu_cmd_t *cmd;
83 	int i;
84 	int ret;
85 
86 	cmd = vzalloc(sizeof(*cmd));
87 	if (!cmd)
88 		return NULL;
89 
90 	cmd->pkt = vzalloc(sizeof(*cmd->pkt));
91 	if (!cmd->pkt) {
92 		vfree(cmd);
93 		return NULL;
94 	}
95 
96 	cmd->id = id;
97 	ret = vpu_iface_pack_cmd(inst->core, cmd->pkt, inst->id, id, data);
98 	if (ret) {
99 		dev_err(inst->dev, "iface pack cmd %s fail\n", vpu_id_name(id));
100 		vfree(cmd->pkt);
101 		vfree(cmd);
102 		return NULL;
103 	}
104 	for (i = 0; i < ARRAY_SIZE(vpu_cmd_requests); i++) {
105 		if (vpu_cmd_requests[i].request == id) {
106 			cmd->request = &vpu_cmd_requests[i];
107 			break;
108 		}
109 	}
110 
111 	return cmd;
112 }
113 
114 static void vpu_free_cmd(struct vpu_cmd_t *cmd)
115 {
116 	if (!cmd)
117 		return;
118 	vfree(cmd->pkt);
119 	vfree(cmd);
120 }
121 
122 static int vpu_session_process_cmd(struct vpu_inst *inst, struct vpu_cmd_t *cmd)
123 {
124 	int ret;
125 
126 	dev_dbg(inst->dev, "[%d]send cmd %s\n", inst->id, vpu_id_name(cmd->id));
127 	vpu_iface_pre_send_cmd(inst);
128 	ret = vpu_cmd_send(inst->core, cmd->pkt);
129 	if (!ret) {
130 		vpu_iface_post_send_cmd(inst);
131 		vpu_inst_record_flow(inst, cmd->id);
132 	} else {
133 		dev_err(inst->dev, "[%d] iface send cmd %s fail\n", inst->id, vpu_id_name(cmd->id));
134 	}
135 
136 	return ret;
137 }
138 
139 static void vpu_process_cmd_request(struct vpu_inst *inst)
140 {
141 	struct vpu_cmd_t *cmd;
142 	struct vpu_cmd_t *tmp;
143 
144 	if (!inst || inst->pending)
145 		return;
146 
147 	list_for_each_entry_safe(cmd, tmp, &inst->cmd_q, list) {
148 		list_del_init(&cmd->list);
149 		if (vpu_session_process_cmd(inst, cmd))
150 			dev_err(inst->dev, "[%d] process cmd %s fail\n",
151 				inst->id, vpu_id_name(cmd->id));
152 		if (cmd->request) {
153 			inst->pending = (void *)cmd;
154 			break;
155 		}
156 		vpu_free_cmd(cmd);
157 	}
158 }
159 
160 static int vpu_request_cmd(struct vpu_inst *inst, u32 id, void *data,
161 			   unsigned long *key, int *sync)
162 {
163 	struct vpu_core *core;
164 	struct vpu_cmd_t *cmd;
165 
166 	if (!inst || !inst->core)
167 		return -EINVAL;
168 
169 	core = inst->core;
170 	cmd = vpu_alloc_cmd(inst, id, data);
171 	if (!cmd)
172 		return -ENOMEM;
173 
174 	mutex_lock(&core->cmd_lock);
175 	cmd->key = core->cmd_seq++;
176 	if (key)
177 		*key = cmd->key;
178 	if (sync)
179 		*sync = cmd->request ? true : false;
180 	list_add_tail(&cmd->list, &inst->cmd_q);
181 	vpu_process_cmd_request(inst);
182 	mutex_unlock(&core->cmd_lock);
183 
184 	return 0;
185 }
186 
187 static void vpu_clear_pending(struct vpu_inst *inst)
188 {
189 	if (!inst || !inst->pending)
190 		return;
191 
192 	vpu_free_cmd(inst->pending);
193 	wake_up_all(&inst->core->ack_wq);
194 	inst->pending = NULL;
195 }
196 
197 static bool vpu_check_response(struct vpu_cmd_t *cmd, u32 response, u32 handled)
198 {
199 	struct vpu_cmd_request *request;
200 
201 	if (!cmd || !cmd->request)
202 		return false;
203 
204 	request = cmd->request;
205 	if (request->response != response)
206 		return false;
207 	if (request->handled != handled)
208 		return false;
209 
210 	return true;
211 }
212 
213 int vpu_response_cmd(struct vpu_inst *inst, u32 response, u32 handled)
214 {
215 	struct vpu_core *core;
216 
217 	if (!inst || !inst->core)
218 		return -EINVAL;
219 
220 	core = inst->core;
221 	mutex_lock(&core->cmd_lock);
222 	if (vpu_check_response(inst->pending, response, handled))
223 		vpu_clear_pending(inst);
224 
225 	vpu_process_cmd_request(inst);
226 	mutex_unlock(&core->cmd_lock);
227 
228 	return 0;
229 }
230 
231 void vpu_clear_request(struct vpu_inst *inst)
232 {
233 	struct vpu_cmd_t *cmd;
234 	struct vpu_cmd_t *tmp;
235 
236 	mutex_lock(&inst->core->cmd_lock);
237 	if (inst->pending)
238 		vpu_clear_pending(inst);
239 
240 	list_for_each_entry_safe(cmd, tmp, &inst->cmd_q, list) {
241 		list_del_init(&cmd->list);
242 		vpu_free_cmd(cmd);
243 	}
244 	mutex_unlock(&inst->core->cmd_lock);
245 }
246 
247 static bool check_is_responsed(struct vpu_inst *inst, unsigned long key)
248 {
249 	struct vpu_core *core = inst->core;
250 	struct vpu_cmd_t *cmd;
251 	bool flag = true;
252 
253 	mutex_lock(&core->cmd_lock);
254 	cmd = inst->pending;
255 	if (cmd && key == cmd->key) {
256 		flag = false;
257 		goto exit;
258 	}
259 	list_for_each_entry(cmd, &inst->cmd_q, list) {
260 		if (key == cmd->key) {
261 			flag = false;
262 			break;
263 		}
264 	}
265 exit:
266 	mutex_unlock(&core->cmd_lock);
267 
268 	return flag;
269 }
270 
271 static int sync_session_response(struct vpu_inst *inst, unsigned long key, long timeout, int try)
272 {
273 	struct vpu_core *core;
274 
275 	if (!inst || !inst->core)
276 		return -EINVAL;
277 
278 	core = inst->core;
279 
280 	call_void_vop(inst, wait_prepare);
281 	wait_event_timeout(core->ack_wq, check_is_responsed(inst, key), timeout);
282 	call_void_vop(inst, wait_finish);
283 
284 	if (!check_is_responsed(inst, key)) {
285 		if (try)
286 			return -EINVAL;
287 		dev_err(inst->dev, "[%d] sync session timeout\n", inst->id);
288 		set_bit(inst->id, &core->hang_mask);
289 		mutex_lock(&inst->core->cmd_lock);
290 		vpu_clear_pending(inst);
291 		mutex_unlock(&inst->core->cmd_lock);
292 		return -EINVAL;
293 	}
294 
295 	return 0;
296 }
297 
298 static void vpu_core_keep_active(struct vpu_core *core)
299 {
300 	struct vpu_rpc_event pkt;
301 
302 	memset(&pkt, 0, sizeof(pkt));
303 	vpu_iface_pack_cmd(core, &pkt, 0, VPU_CMD_ID_NOOP, NULL);
304 
305 	dev_dbg(core->dev, "try to wake up\n");
306 	mutex_lock(&core->cmd_lock);
307 	if (vpu_cmd_send(core, &pkt))
308 		dev_err(core->dev, "fail to keep active\n");
309 	mutex_unlock(&core->cmd_lock);
310 }
311 
312 static int vpu_session_send_cmd(struct vpu_inst *inst, u32 id, void *data)
313 {
314 	unsigned long key;
315 	int sync = false;
316 	int ret;
317 
318 	if (inst->id < 0)
319 		return -EINVAL;
320 
321 	ret = vpu_request_cmd(inst, id, data, &key, &sync);
322 	if (ret)
323 		goto exit;
324 
325 	/* workaround for a firmware issue,
326 	 * firmware should be waked up by start or configure command,
327 	 * but there is a very small change that firmware failed to wakeup.
328 	 * in such case, try to wakeup firmware again by sending a noop command
329 	 */
330 	if (sync && (id == VPU_CMD_ID_CONFIGURE_CODEC || id == VPU_CMD_ID_START)) {
331 		if (sync_session_response(inst, key, VPU_TIMEOUT_WAKEUP, 1))
332 			vpu_core_keep_active(inst->core);
333 		else
334 			goto exit;
335 	}
336 
337 	if (sync)
338 		ret = sync_session_response(inst, key, VPU_TIMEOUT, 0);
339 
340 exit:
341 	if (ret)
342 		dev_err(inst->dev, "[%d] send cmd %s fail\n", inst->id, vpu_id_name(id));
343 
344 	return ret;
345 }
346 
347 int vpu_session_configure_codec(struct vpu_inst *inst)
348 {
349 	return vpu_session_send_cmd(inst, VPU_CMD_ID_CONFIGURE_CODEC, NULL);
350 }
351 
352 int vpu_session_start(struct vpu_inst *inst)
353 {
354 	vpu_trace(inst->dev, "[%d]\n", inst->id);
355 
356 	return vpu_session_send_cmd(inst, VPU_CMD_ID_START, NULL);
357 }
358 
359 int vpu_session_stop(struct vpu_inst *inst)
360 {
361 	int ret;
362 
363 	vpu_trace(inst->dev, "[%d]\n", inst->id);
364 
365 	ret = vpu_session_send_cmd(inst, VPU_CMD_ID_STOP, NULL);
366 	/* workaround for a firmware bug,
367 	 * if the next command is too close after stop cmd,
368 	 * the firmware may enter wfi wrongly.
369 	 */
370 	usleep_range(3000, 5000);
371 	return ret;
372 }
373 
374 int vpu_session_encode_frame(struct vpu_inst *inst, s64 timestamp)
375 {
376 	return vpu_session_send_cmd(inst, VPU_CMD_ID_FRAME_ENCODE, &timestamp);
377 }
378 
379 int vpu_session_alloc_fs(struct vpu_inst *inst, struct vpu_fs_info *fs)
380 {
381 	return vpu_session_send_cmd(inst, VPU_CMD_ID_FS_ALLOC, fs);
382 }
383 
384 int vpu_session_release_fs(struct vpu_inst *inst, struct vpu_fs_info *fs)
385 {
386 	return vpu_session_send_cmd(inst, VPU_CMD_ID_FS_RELEASE, fs);
387 }
388 
389 int vpu_session_abort(struct vpu_inst *inst)
390 {
391 	return vpu_session_send_cmd(inst, VPU_CMD_ID_ABORT, NULL);
392 }
393 
394 int vpu_session_rst_buf(struct vpu_inst *inst)
395 {
396 	return vpu_session_send_cmd(inst, VPU_CMD_ID_RST_BUF, NULL);
397 }
398 
399 int vpu_session_fill_timestamp(struct vpu_inst *inst, struct vpu_ts_info *info)
400 {
401 	return vpu_session_send_cmd(inst, VPU_CMD_ID_TIMESTAMP, info);
402 }
403 
404 int vpu_session_update_parameters(struct vpu_inst *inst, void *arg)
405 {
406 	if (inst->type & VPU_CORE_TYPE_DEC)
407 		vpu_iface_set_decode_params(inst, arg, 1);
408 	else
409 		vpu_iface_set_encode_params(inst, arg, 1);
410 
411 	return vpu_session_send_cmd(inst, VPU_CMD_ID_UPDATE_PARAMETER, arg);
412 }
413 
414 int vpu_session_debug(struct vpu_inst *inst)
415 {
416 	return vpu_session_send_cmd(inst, VPU_CMD_ID_DEBUG, NULL);
417 }
418 
419 int vpu_core_snapshot(struct vpu_core *core)
420 {
421 	struct vpu_inst *inst;
422 	int ret;
423 
424 	if (!core || list_empty(&core->instances))
425 		return 0;
426 
427 	inst = list_first_entry(&core->instances, struct vpu_inst, list);
428 
429 	reinit_completion(&core->cmp);
430 	ret = vpu_session_send_cmd(inst, VPU_CMD_ID_SNAPSHOT, NULL);
431 	if (ret)
432 		return ret;
433 	ret = wait_for_completion_timeout(&core->cmp, VPU_TIMEOUT);
434 	if (!ret) {
435 		dev_err(core->dev, "snapshot timeout\n");
436 		return -EINVAL;
437 	}
438 
439 	return 0;
440 }
441 
442 int vpu_core_sw_reset(struct vpu_core *core)
443 {
444 	struct vpu_rpc_event pkt;
445 	int ret;
446 
447 	memset(&pkt, 0, sizeof(pkt));
448 	vpu_iface_pack_cmd(core, &pkt, 0, VPU_CMD_ID_FIRM_RESET, NULL);
449 
450 	reinit_completion(&core->cmp);
451 	mutex_lock(&core->cmd_lock);
452 	ret = vpu_cmd_send(core, &pkt);
453 	mutex_unlock(&core->cmd_lock);
454 	if (ret)
455 		return ret;
456 	ret = wait_for_completion_timeout(&core->cmp, VPU_TIMEOUT);
457 	if (!ret) {
458 		dev_err(core->dev, "sw reset timeout\n");
459 		return -EINVAL;
460 	}
461 
462 	return 0;
463 }
464