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800f879a AT |
1 | /* |
2 | * Copyright 2010-2017 Intel Corporation. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License, version 2, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * Disclaimer: The codes contained in these modules may be specific to | |
14 | * the Intel Software Development Platform codenamed Knights Ferry, | |
15 | * and the Intel product codenamed Knights Corner, and are not backward | |
16 | * compatible with other Intel products. Additionally, Intel will NOT | |
17 | * support the codes or instruction set in future products. | |
18 | * | |
19 | * Intel offers no warranty of any kind regarding the code. This code is | |
20 | * licensed on an "AS IS" basis and Intel is not obligated to provide | |
21 | * any support, assistance, installation, training, or other services | |
22 | * of any kind. Intel is also not obligated to provide any updates, | |
23 | * enhancements or extensions. Intel specifically disclaims any warranty | |
24 | * of merchantability, non-infringement, fitness for any particular | |
25 | * purpose, and any other warranty. | |
26 | * | |
27 | * Further, Intel disclaims all liability of any kind, including but | |
28 | * not limited to liability for infringement of any proprietary rights, | |
29 | * relating to the use of the code, even if Intel is notified of the | |
30 | * possibility of such liability. Except as expressly stated in an Intel | |
31 | * license agreement provided with this code and agreed upon with Intel, | |
32 | * no license, express or implied, by estoppel or otherwise, to any | |
33 | * intellectual property rights is granted herein. | |
34 | */ | |
35 | ||
36 | #include <linux/init.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/workqueue.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/cdev.h> | |
41 | #include <linux/device.h> | |
42 | #include <scif.h> | |
43 | #include <mic/mic_pm.h> | |
44 | #include <mic/micscif.h> | |
45 | #include "pm_scif.h" | |
46 | ||
47 | #define PM_DB(fmt, ...) printk(KERN_ALERT"[ %s : %d ]:"fmt,__func__, __LINE__, ##__VA_ARGS__) | |
48 | #define FUNCTION_ENTRY PM_DB("==> %s\n", __func__) | |
49 | #define FUNCTION_EXIT PM_DB("<== %s\n", __func__) | |
50 | ||
51 | #define PM_SCIF_RETRY_COUNT 5 | |
52 | ||
53 | DEFINE_RWLOCK(pmscif_send); | |
54 | ||
55 | static atomic_t epinuse = ATOMIC_INIT(0); | |
56 | void pm_scif_exit(void); | |
57 | ||
58 | typedef struct _mic_pm_scif { | |
59 | scif_epd_t ep; | |
60 | int lport; | |
61 | struct scif_portID rport_id; | |
62 | struct workqueue_struct *pm_recvq; | |
63 | struct work_struct pm_recv; | |
64 | PM_CONNECTION_STATE con_state; | |
65 | } mic_pm_scif; | |
66 | ||
67 | mic_pm_scif *pm_scif; | |
68 | ||
69 | void | |
70 | pm_dump(char *buf, size_t len) | |
71 | { | |
72 | int i = 0; | |
73 | ||
74 | for ( i=0; i < len; i++) { | |
75 | ||
76 | if (i % 8) | |
77 | printk(KERN_ALERT"\n"); | |
78 | printk(KERN_ALERT"%x ", buf[i]); | |
79 | } | |
80 | } | |
81 | ||
82 | static void pm_handle_open (void *msg, size_t len) | |
83 | { | |
84 | FUNCTION_ENTRY; | |
85 | pm_dump((char*)msg, len); | |
86 | } | |
87 | ||
88 | static void pm_handle_test (void *msg, size_t len) | |
89 | { | |
90 | FUNCTION_ENTRY; | |
91 | pm_dump((char*)msg, len); | |
92 | ||
93 | } | |
94 | typedef void (*_pm_msg_handler)(void*, size_t); | |
95 | ||
96 | typedef struct _pm_msg_call { | |
97 | _pm_msg_handler handler; | |
98 | char *name; | |
99 | }pm_msg_call; | |
100 | ||
101 | #define PM_HANDLE_ADD(opcode, function) [(opcode)] = {(function), #function} | |
102 | ||
103 | pm_msg_call pm_msg_caller[PM_MESSAGE_MAX] = { | |
104 | PM_HANDLE_ADD(PM_MESSAGE_OPEN, pm_handle_open), | |
105 | PM_HANDLE_ADD(PM_MESSAGE_TEST, pm_handle_test) | |
106 | }; | |
107 | ||
108 | int | |
109 | pm_send_to_host(PM_MESSAGE opcode, void *msg, size_t len) | |
110 | { | |
111 | // FUNCTION_ENTRY; | |
112 | int err = 0; | |
113 | size_t psize = sizeof(pm_msg_header) + len; | |
114 | char *payload; | |
115 | unsigned long flags; | |
116 | ||
117 | if (pm_scif->con_state != PM_CONNECTED) { | |
118 | err = -EINVAL; | |
119 | goto error; | |
120 | } | |
121 | ||
122 | if (!(payload = kmalloc(psize, GFP_ATOMIC))) { | |
123 | err = -ENOMEM; | |
124 | goto error; | |
125 | } | |
126 | read_lock_irqsave(&pmscif_send,flags); | |
127 | ||
128 | if (atomic_xchg(&epinuse,1) != 0) { | |
129 | read_unlock_irqrestore(&pmscif_send,flags); | |
130 | kfree(payload); | |
131 | return -1; | |
132 | } | |
133 | ||
134 | ((pm_msg_header*)payload)->opcode = opcode; | |
135 | ((pm_msg_header*)payload)->len = len; | |
136 | if (len) | |
137 | memcpy((char*)payload + sizeof(pm_msg_header), msg, len); | |
138 | ||
139 | //0 for non blocking | |
140 | if ((err = scif_send(pm_scif->ep, payload, psize, 0)) < 0) { | |
141 | PM_DB("scif_recv failed\n"); | |
142 | } | |
143 | atomic_set(&epinuse,0); | |
144 | //for (i = 0; i < psize; i++) | |
145 | // printk(KERN_ALERT" buff: %X\n", payload[i]); | |
146 | read_unlock_irqrestore(&pmscif_send,flags); | |
147 | kfree(payload); | |
148 | // FUNCTION_EXIT; | |
149 | error: | |
150 | return err; | |
151 | } | |
152 | ||
153 | EXPORT_SYMBOL(pm_send_to_host); | |
154 | ||
155 | static struct mic_pmscif_handle micpmscif = { | |
156 | .pm_scif_uos2host = pm_send_to_host, | |
157 | .pm_scif_host2uos = NULL, | |
158 | .owner = THIS_MODULE, | |
159 | }; | |
160 | ||
161 | ||
162 | ||
163 | static void pm_send_to_uos(pm_msg_header *header, char *msg) | |
164 | { | |
165 | if(micpmscif.pm_scif_host2uos) { | |
166 | micpmscif.pm_scif_host2uos(header, msg); | |
167 | } | |
168 | } | |
169 | ||
170 | static void | |
171 | pm_recv_from_host(struct work_struct *work) | |
172 | { | |
173 | int err = 0; | |
174 | char *msg = NULL; | |
175 | pm_msg_header *header; | |
176 | mic_pm_scif *pm_scif_info = container_of(work, mic_pm_scif, pm_recv); | |
177 | ||
178 | FUNCTION_ENTRY; | |
179 | if (pm_scif->con_state != PM_CONNECTED) | |
180 | goto exit; | |
181 | ||
182 | header = kmalloc(sizeof(pm_msg_header), GFP_KERNEL); | |
183 | ||
184 | if ((err = scif_recv(pm_scif_info->ep, header, sizeof(pm_msg_header), | |
185 | SCIF_RECV_BLOCK)) < 0) { | |
186 | PM_DB("scif_recv failed\n"); | |
187 | goto end_con; | |
188 | } | |
189 | ||
190 | msg = kmalloc(header->len, GFP_KERNEL); | |
191 | ||
192 | if ((err = scif_recv(pm_scif_info->ep, msg, header->len, | |
193 | SCIF_RECV_BLOCK)) < 0) { | |
194 | PM_DB("scif_recv failed\n"); | |
195 | goto end_con; | |
196 | } | |
197 | if(header->opcode < PM_MESSAGE_MAX) { | |
198 | if ((header->opcode != PM_MESSAGE_CLOSE) && | |
199 | (header->opcode != PM_MESSAGE_CLOSE_ACK)) { | |
200 | if(pm_msg_caller[header->opcode].handler) | |
201 | pm_msg_caller[header->opcode].handler(msg, header->len); | |
202 | pm_send_to_uos(header, msg); | |
203 | } else { | |
204 | if (header->opcode == PM_MESSAGE_CLOSE) { | |
205 | pm_send_to_uos(header,msg); | |
206 | pm_send_to_host(PM_MESSAGE_CLOSE_ACK, NULL, 0); | |
207 | } | |
208 | pm_scif->con_state = PM_DISCONNECTING; | |
209 | goto end_con; | |
210 | } | |
211 | } | |
212 | else | |
213 | printk("pm_scif: Recvd scif message with bad opcode %d\n", | |
214 | header->opcode); | |
215 | kfree(header); | |
216 | kfree(msg); | |
217 | queue_work(pm_scif->pm_recvq, &pm_scif->pm_recv); | |
218 | return; | |
219 | ||
220 | end_con: | |
221 | kfree(header); | |
222 | kfree(msg); | |
223 | exit: | |
224 | FUNCTION_EXIT; | |
225 | } | |
226 | ||
227 | #ifdef PM_SCIF_IOCTL | |
228 | static int | |
229 | spm_ioctl(struct inode *in, struct file *f, unsigned int cmd, unsigned long arg) | |
230 | { | |
231 | int i = 0; | |
232 | uint32_t payload = 0xc0de0000; | |
233 | ||
234 | FUNCTION_ENTRY; | |
235 | for (i = 0; i < PM_MESSAGE_TEST; i++) { | |
236 | payload++; | |
237 | //PM_DB("sending %s with payload = %x \n", | |
238 | // pm_msg_caller[i].name, payload); | |
239 | pm_send_to_host(i, &payload, sizeof(payload)); | |
240 | } | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static long | |
246 | spm_unlocked_ioctl(struct file *f, unsigned int cmd, unsigned long arg) | |
247 | { | |
248 | return (long) spm_ioctl(f->f_path.dentry->d_inode, f, cmd, arg); | |
249 | } | |
250 | ||
251 | static int | |
252 | spm_release(struct inode *in, struct file *f) | |
253 | { | |
254 | return 0; | |
255 | } | |
256 | ||
257 | static char * | |
258 | spm_devnode(struct device *dev, mode_t *mode) | |
259 | { | |
260 | return kasprintf(GFP_KERNEL, "spm/%s", dev_name(dev)); | |
261 | } | |
262 | ||
263 | ||
264 | static int | |
265 | spm_open(struct inode *in, struct file *f) | |
266 | { | |
267 | return 0; | |
268 | } | |
269 | ||
270 | struct file_operations spm_ops = { | |
271 | .owner = THIS_MODULE, | |
272 | .unlocked_ioctl = spm_unlocked_ioctl, | |
273 | .open = spm_open, | |
274 | .release = spm_release, | |
275 | }; | |
276 | ||
277 | int spm_major; | |
278 | int spm_minor; | |
279 | dev_t spmdev; | |
280 | struct cdev spmcdev; | |
281 | struct class *spmclass; | |
282 | ||
283 | static void | |
284 | spm_dev_deinit(void) | |
285 | { | |
286 | device_destroy(spmclass,spmdev); | |
287 | class_destroy(spmclass); | |
288 | cdev_del(&spmcdev); | |
289 | unregister_chrdev_region(spmdev, 1); | |
290 | } | |
291 | ||
292 | static int | |
293 | spm_dev_init(void) | |
294 | { | |
295 | int err = 0; | |
296 | ||
297 | if (spm_major) { | |
298 | spmdev = MKDEV(spm_major, spm_minor); | |
299 | err = register_chrdev_region(spmdev, 1, "spm"); | |
300 | } | |
301 | else { | |
302 | err = alloc_chrdev_region(&spmdev, spm_minor, 1, "spm"); | |
303 | spm_major = MAJOR(spmdev); | |
304 | } | |
305 | ||
306 | if (err < 0) { | |
307 | unregister_chrdev_region(spmdev, 1); | |
308 | goto done; | |
309 | } | |
310 | ||
311 | spmdev = MKDEV(spm_major, spm_minor); | |
312 | cdev_init(&spmcdev, &spm_ops); | |
313 | spmcdev.owner = THIS_MODULE; | |
314 | err = cdev_add(&spmcdev, spmdev, 1); | |
315 | ||
316 | if (err) | |
317 | goto err; | |
318 | ||
319 | spmclass = class_create(THIS_MODULE, "spm"); | |
320 | if (IS_ERR(spmclass)) { | |
321 | err = PTR_ERR(spmclass); | |
322 | goto err; | |
323 | } | |
324 | ||
325 | spmclass->devnode = spm_devnode; | |
326 | device_create(spmclass, NULL, spmdev, NULL, "spm"); | |
327 | if (IS_ERR(spmclass)) { | |
328 | err = PTR_ERR(spmclass); | |
329 | goto err; | |
330 | } | |
331 | done: | |
332 | return err; | |
333 | err: | |
334 | spm_dev_deinit(); | |
335 | return err; | |
336 | } | |
337 | #endif | |
338 | ||
339 | int pm_scif_init(void) | |
340 | { | |
341 | int err = 1; | |
342 | int retry = 0; | |
343 | ||
344 | FUNCTION_ENTRY; | |
345 | PM_DB("pm_scif insmoded \n"); | |
346 | #ifdef PM_SCIF_IOCTL | |
347 | if ((err = spm_dev_init())) { | |
348 | PM_DB(" spm_dev_init failed\n"); | |
349 | goto done; | |
350 | } | |
351 | #endif | |
352 | atomic_set(&epinuse,0); | |
353 | pm_scif = kzalloc(sizeof(mic_pm_scif), GFP_KERNEL); | |
354 | ||
355 | if (!pm_scif) { | |
356 | err = -ENOMEM; | |
357 | goto end_con; | |
358 | } | |
359 | ||
360 | pm_scif_register(&micpmscif); | |
361 | ||
362 | if ((pm_scif->ep = scif_open()) == NULL) { | |
363 | PM_DB(" scif_open failed\n"); | |
364 | goto end_con; | |
365 | } | |
366 | ||
367 | if ((pm_scif->lport = scif_bind(pm_scif->ep, 0)) < 0) { | |
368 | PM_DB(" scif_bind failed\n"); | |
369 | goto end_con; | |
370 | } | |
371 | ||
372 | PM_DB(" scif_bind successfull. Local port number = %d, ep = \n", | |
373 | pm_scif->lport); | |
374 | dump_ep(pm_scif->ep, __func__,__LINE__); | |
375 | pm_scif->rport_id.node = 0; | |
376 | pm_scif->rport_id.port = SCIF_PM_PORT_0; | |
377 | ||
378 | while ((err = scif_connect(pm_scif->ep, &pm_scif->rport_id)) != 0) { | |
379 | PM_DB(" scif_connect failed with err = %d ep %p\n",err, | |
380 | pm_scif->ep); | |
381 | msleep(1000); | |
382 | if (retry++ > PM_SCIF_RETRY_COUNT) | |
383 | goto end_con; | |
384 | } | |
385 | ||
386 | pm_scif->pm_recvq = create_singlethread_workqueue("pm_recvq"); | |
387 | INIT_WORK(&pm_scif->pm_recv, pm_recv_from_host); | |
388 | queue_work(pm_scif->pm_recvq, &pm_scif->pm_recv); | |
389 | pm_scif->con_state = PM_CONNECTED; | |
390 | err = 0; | |
391 | #ifdef PM_SCIF_IOCTL | |
392 | done: | |
393 | #endif | |
394 | return err; | |
395 | end_con: | |
396 | pm_scif_exit(); | |
397 | FUNCTION_EXIT; | |
398 | return err; | |
399 | } | |
400 | EXPORT_SYMBOL(pm_scif_init); | |
401 | ||
402 | void pm_scif_exit(void) | |
403 | { | |
404 | unsigned long flags; | |
405 | ||
406 | FUNCTION_ENTRY; | |
407 | PM_DB("Good Bye!, pm scif \n"); | |
408 | ||
409 | pm_send_to_host(PM_MESSAGE_CLOSE, NULL, 0); | |
410 | write_lock_irqsave(&pmscif_send,flags); | |
411 | atomic_set(&epinuse,1); | |
412 | write_unlock_irqrestore(&pmscif_send,flags); | |
413 | ||
414 | if (pm_scif) { | |
415 | if(pm_scif->pm_recvq) { | |
416 | flush_workqueue(pm_scif->pm_recvq); | |
417 | PM_DB("calling destroy\n"); | |
418 | destroy_workqueue(pm_scif->pm_recvq); | |
419 | } | |
420 | ||
421 | PM_DB("closing ep \n"); | |
422 | if (pm_scif->ep) | |
423 | scif_close(pm_scif->ep); | |
424 | ||
425 | pm_scif_unregister(&micpmscif); | |
426 | pm_scif->con_state = PM_DISCONNECTED; | |
427 | kfree(pm_scif); | |
428 | } | |
429 | #ifdef PM_SCIF_IOCTL | |
430 | spm_dev_deinit(); | |
431 | #endif | |
432 | FUNCTION_EXIT; | |
433 | } | |
434 | ||
435 | EXPORT_SYMBOL(pm_scif_exit); | |
436 | ||
437 | module_init(pm_scif_init); | |
438 | module_exit(pm_scif_exit); | |
439 | MODULE_LICENSE("GPL"); |