summaryrefslogtreecommitdiff
path: root/drivers/misc/habanalabs/habanalabs_drv.c
blob: 748601463f111b5e7de0f7fcef0520fd829914e8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
// SPDX-License-Identifier: GPL-2.0

/*
 * Copyright 2016-2019 HabanaLabs, Ltd.
 * All Rights Reserved.
 *
 */

#include "habanalabs.h"

#include <linux/pci.h>
#include <linux/module.h>

#define HL_DRIVER_AUTHOR	"HabanaLabs Kernel Driver Team"

#define HL_DRIVER_DESC		"Driver for HabanaLabs's AI Accelerators"

MODULE_AUTHOR(HL_DRIVER_AUTHOR);
MODULE_DESCRIPTION(HL_DRIVER_DESC);
MODULE_LICENSE("GPL v2");

static int hl_major;
static struct class *hl_class;
static DEFINE_IDR(hl_devs_idr);
static DEFINE_MUTEX(hl_devs_idr_lock);

static int timeout_locked = 5;
static int reset_on_lockup = 1;

module_param(timeout_locked, int, 0444);
MODULE_PARM_DESC(timeout_locked,
	"Device lockup timeout in seconds (0 = disabled, default 5s)");

module_param(reset_on_lockup, int, 0444);
MODULE_PARM_DESC(reset_on_lockup,
	"Do device reset on lockup (0 = no, 1 = yes, default yes)");

#define PCI_VENDOR_ID_HABANALABS	0x1da3

#define PCI_IDS_GOYA			0x0001

static const struct pci_device_id ids[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_HABANALABS, PCI_IDS_GOYA), },
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, ids);

/*
 * get_asic_type - translate device id to asic type
 *
 * @device: id of the PCI device
 *
 * Translate device id to asic type.
 * In case of unidentified device, return -1
 */
static enum hl_asic_type get_asic_type(u16 device)
{
	enum hl_asic_type asic_type;

	switch (device) {
	case PCI_IDS_GOYA:
		asic_type = ASIC_GOYA;
		break;
	default:
		asic_type = ASIC_INVALID;
		break;
	}

	return asic_type;
}

/*
 * hl_device_open - open function for habanalabs device
 *
 * @inode: pointer to inode structure
 * @filp: pointer to file structure
 *
 * Called when process opens an habanalabs device.
 */
int hl_device_open(struct inode *inode, struct file *filp)
{
	struct hl_device *hdev;
	struct hl_fpriv *hpriv;
	int rc;

	mutex_lock(&hl_devs_idr_lock);
	hdev = idr_find(&hl_devs_idr, iminor(inode));
	mutex_unlock(&hl_devs_idr_lock);

	if (!hdev) {
		pr_err("Couldn't find device %d:%d\n",
			imajor(inode), iminor(inode));
		return -ENXIO;
	}

	mutex_lock(&hdev->fd_open_cnt_lock);

	if (hl_device_disabled_or_in_reset(hdev)) {
		dev_err_ratelimited(hdev->dev,
			"Can't open %s because it is disabled or in reset\n",
			dev_name(hdev->dev));
		mutex_unlock(&hdev->fd_open_cnt_lock);
		return -EPERM;
	}

	if (atomic_read(&hdev->fd_open_cnt)) {
		dev_info_ratelimited(hdev->dev,
			"Device %s is already attached to application\n",
			dev_name(hdev->dev));
		mutex_unlock(&hdev->fd_open_cnt_lock);
		return -EBUSY;
	}

	atomic_inc(&hdev->fd_open_cnt);

	mutex_unlock(&hdev->fd_open_cnt_lock);

	hpriv = kzalloc(sizeof(*hpriv), GFP_KERNEL);
	if (!hpriv) {
		rc = -ENOMEM;
		goto close_device;
	}

	hpriv->hdev = hdev;
	filp->private_data = hpriv;
	hpriv->filp = filp;
	mutex_init(&hpriv->restore_phase_mutex);
	kref_init(&hpriv->refcount);
	nonseekable_open(inode, filp);

	hl_cb_mgr_init(&hpriv->cb_mgr);
	hl_ctx_mgr_init(&hpriv->ctx_mgr);

	rc = hl_ctx_create(hdev, hpriv);
	if (rc) {
		dev_err(hdev->dev, "Failed to open FD (CTX fail)\n");
		goto out_err;
	}

	hpriv->taskpid = find_get_pid(current->pid);

	/*
	 * Device is IDLE at this point so it is legal to change PLLs. There
	 * is no need to check anything because if the PLL is already HIGH, the
	 * set function will return without doing anything
	 */
	hl_device_set_frequency(hdev, PLL_HIGH);

	hl_debugfs_add_file(hpriv);

	return 0;

out_err:
	filp->private_data = NULL;
	hl_ctx_mgr_fini(hpriv->hdev, &hpriv->ctx_mgr);
	hl_cb_mgr_fini(hpriv->hdev, &hpriv->cb_mgr);
	mutex_destroy(&hpriv->restore_phase_mutex);
	kfree(hpriv);

close_device:
	atomic_dec(&hdev->fd_open_cnt);
	return rc;
}

/*
 * create_hdev - create habanalabs device instance
 *
 * @dev: will hold the pointer to the new habanalabs device structure
 * @pdev: pointer to the pci device
 * @asic_type: in case of simulator device, which device is it
 * @minor: in case of simulator device, the minor of the device
 *
 * Allocate memory for habanalabs device and initialize basic fields
 * Identify the ASIC type
 * Allocate ID (minor) for the device (only for real devices)
 */
int create_hdev(struct hl_device **dev, struct pci_dev *pdev,
		enum hl_asic_type asic_type, int minor)
{
	struct hl_device *hdev;
	int rc;

	*dev = NULL;

	hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
	if (!hdev)
		return -ENOMEM;

	hdev->major = hl_major;
	hdev->reset_on_lockup = reset_on_lockup;

	/* Parameters for bring-up - set them to defaults */
	hdev->mmu_enable = 1;
	hdev->cpu_enable = 1;
	hdev->reset_pcilink = 0;
	hdev->cpu_queues_enable = 1;
	hdev->fw_loading = 1;
	hdev->pldm = 0;
	hdev->heartbeat = 1;

	/* If CPU is disabled, no point in loading FW */
	if (!hdev->cpu_enable)
		hdev->fw_loading = 0;

	/* If we don't load FW, no need to initialize CPU queues */
	if (!hdev->fw_loading)
		hdev->cpu_queues_enable = 0;

	/* If CPU queues not enabled, no way to do heartbeat */
	if (!hdev->cpu_queues_enable)
		hdev->heartbeat = 0;

	if (timeout_locked)
		hdev->timeout_jiffies = msecs_to_jiffies(timeout_locked * 1000);
	else
		hdev->timeout_jiffies = MAX_SCHEDULE_TIMEOUT;

	hdev->disabled = true;
	hdev->pdev = pdev; /* can be NULL in case of simulator device */

	if (asic_type == ASIC_AUTO_DETECT) {
		hdev->asic_type = get_asic_type(pdev->device);
		if (hdev->asic_type == ASIC_INVALID) {
			dev_err(&pdev->dev, "Unsupported ASIC\n");
			rc = -ENODEV;
			goto free_hdev;
		}
	} else {
		hdev->asic_type = asic_type;
	}

	mutex_lock(&hl_devs_idr_lock);

	if (minor == -1) {
		rc = idr_alloc(&hl_devs_idr, hdev, 0, HL_MAX_MINORS,
				GFP_KERNEL);
	} else {
		void *old_idr = idr_replace(&hl_devs_idr, hdev, minor);

		if (IS_ERR_VALUE(old_idr)) {
			rc = PTR_ERR(old_idr);
			pr_err("Error %d when trying to replace minor %d\n",
				rc, minor);
			mutex_unlock(&hl_devs_idr_lock);
			goto free_hdev;
		}
		rc = minor;
	}

	mutex_unlock(&hl_devs_idr_lock);

	if (rc < 0) {
		if (rc == -ENOSPC) {
			pr_err("too many devices in the system\n");
			rc = -EBUSY;
		}
		goto free_hdev;
	}

	hdev->id = rc;

	*dev = hdev;

	return 0;

free_hdev:
	kfree(hdev);
	return rc;
}

/*
 * destroy_hdev - destroy habanalabs device instance
 *
 * @dev: pointer to the habanalabs device structure
 *
 */
void destroy_hdev(struct hl_device *hdev)
{
	/* Remove device from the device list */
	mutex_lock(&hl_devs_idr_lock);
	idr_remove(&hl_devs_idr, hdev->id);
	mutex_unlock(&hl_devs_idr_lock);

	kfree(hdev);
}

static int hl_pmops_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct hl_device *hdev = pci_get_drvdata(pdev);

	pr_debug("Going to suspend PCI device\n");

	if (!hdev) {
		pr_err("device pointer is NULL in suspend\n");
		return 0;
	}

	return hl_device_suspend(hdev);
}

static int hl_pmops_resume(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct hl_device *hdev = pci_get_drvdata(pdev);

	pr_debug("Going to resume PCI device\n");

	if (!hdev) {
		pr_err("device pointer is NULL in resume\n");
		return 0;
	}

	return hl_device_resume(hdev);
}

/*
 * hl_pci_probe - probe PCI habanalabs devices
 *
 * @pdev: pointer to pci device
 * @id: pointer to pci device id structure
 *
 * Standard PCI probe function for habanalabs device.
 * Create a new habanalabs device and initialize it according to the
 * device's type
 */
static int hl_pci_probe(struct pci_dev *pdev,
				const struct pci_device_id *id)
{
	struct hl_device *hdev;
	int rc;

	dev_info(&pdev->dev, HL_NAME
		 " device found [%04x:%04x] (rev %x)\n",
		 (int)pdev->vendor, (int)pdev->device, (int)pdev->revision);

	rc = create_hdev(&hdev, pdev, ASIC_AUTO_DETECT, -1);
	if (rc)
		return rc;

	pci_set_drvdata(pdev, hdev);

	rc = hl_device_init(hdev, hl_class);
	if (rc) {
		dev_err(&pdev->dev, "Fatal error during habanalabs device init\n");
		rc = -ENODEV;
		goto disable_device;
	}

	return 0;

disable_device:
	pci_set_drvdata(pdev, NULL);
	destroy_hdev(hdev);

	return rc;
}

/*
 * hl_pci_remove - remove PCI habanalabs devices
 *
 * @pdev: pointer to pci device
 *
 * Standard PCI remove function for habanalabs device
 */
static void hl_pci_remove(struct pci_dev *pdev)
{
	struct hl_device *hdev;

	hdev = pci_get_drvdata(pdev);
	if (!hdev)
		return;

	hl_device_fini(hdev);
	pci_set_drvdata(pdev, NULL);

	destroy_hdev(hdev);
}

static const struct dev_pm_ops hl_pm_ops = {
	.suspend = hl_pmops_suspend,
	.resume = hl_pmops_resume,
};

static struct pci_driver hl_pci_driver = {
	.name = HL_NAME,
	.id_table = ids,
	.probe = hl_pci_probe,
	.remove = hl_pci_remove,
	.driver.pm = &hl_pm_ops,
};

/*
 * hl_init - Initialize the habanalabs kernel driver
 */
static int __init hl_init(void)
{
	int rc;
	dev_t dev;

	pr_info("loading driver\n");

	rc = alloc_chrdev_region(&dev, 0, HL_MAX_MINORS, HL_NAME);
	if (rc < 0) {
		pr_err("unable to get major\n");
		return rc;
	}

	hl_major = MAJOR(dev);

	hl_class = class_create(THIS_MODULE, HL_NAME);
	if (IS_ERR(hl_class)) {
		pr_err("failed to allocate class\n");
		rc = PTR_ERR(hl_class);
		goto remove_major;
	}

	hl_debugfs_init();

	rc = pci_register_driver(&hl_pci_driver);
	if (rc) {
		pr_err("failed to register pci device\n");
		goto remove_debugfs;
	}

	pr_debug("driver loaded\n");

	return 0;

remove_debugfs:
	hl_debugfs_fini();
	class_destroy(hl_class);
remove_major:
	unregister_chrdev_region(MKDEV(hl_major, 0), HL_MAX_MINORS);
	return rc;
}

/*
 * hl_exit - Release all resources of the habanalabs kernel driver
 */
static void __exit hl_exit(void)
{
	pci_unregister_driver(&hl_pci_driver);

	/*
	 * Removing debugfs must be after all devices or simulator devices
	 * have been removed because otherwise we get a bug in the
	 * debugfs module for referencing NULL objects
	 */
	hl_debugfs_fini();

	class_destroy(hl_class);
	unregister_chrdev_region(MKDEV(hl_major, 0), HL_MAX_MINORS);

	idr_destroy(&hl_devs_idr);

	pr_debug("driver removed\n");
}

module_init(hl_init);
module_exit(hl_exit);