aboutsummaryrefslogtreecommitdiff
path: root/drivers/misc/mic/host/mic_boot.c
blob: b75c6b5cc20fc7a908944291add52a5cada071ff (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
/*
 * Intel MIC Platform Software Stack (MPSS)
 *
 * Copyright(c) 2013 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Intel MIC Host driver.
 *
 */
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/pci.h>

#include <linux/mic_common.h>
#include "../common/mic_dev.h"
#include "mic_device.h"
#include "mic_smpt.h"
#include "mic_virtio.h"

/**
 * mic_reset - Reset the MIC device.
 * @mdev: pointer to mic_device instance
 */
static void mic_reset(struct mic_device *mdev)
{
	int i;

#define MIC_RESET_TO (45)

	reinit_completion(&mdev->reset_wait);
	mdev->ops->reset_fw_ready(mdev);
	mdev->ops->reset(mdev);

	for (i = 0; i < MIC_RESET_TO; i++) {
		if (mdev->ops->is_fw_ready(mdev))
			goto done;
		/*
		 * Resets typically take 10s of seconds to complete.
		 * Since an MMIO read is required to check if the
		 * firmware is ready or not, a 1 second delay works nicely.
		 */
		msleep(1000);
	}
	mic_set_state(mdev, MIC_RESET_FAILED);
done:
	complete_all(&mdev->reset_wait);
}

/* Initialize the MIC bootparams */
void mic_bootparam_init(struct mic_device *mdev)
{
	struct mic_bootparam *bootparam = mdev->dp;

	bootparam->magic = cpu_to_le32(MIC_MAGIC);
	bootparam->c2h_shutdown_db = mdev->shutdown_db;
	bootparam->h2c_shutdown_db = -1;
	bootparam->h2c_config_db = -1;
	bootparam->shutdown_status = 0;
	bootparam->shutdown_card = 0;
}

/**
 * mic_start - Start the MIC.
 * @mdev: pointer to mic_device instance
 * @buf: buffer containing boot string including firmware/ramdisk path.
 *
 * This function prepares an MIC for boot and initiates boot.
 * RETURNS: An appropriate -ERRNO error value on error, or zero for success.
 */
int mic_start(struct mic_device *mdev, const char *buf)
{
	int rc;
	mutex_lock(&mdev->mic_mutex);
retry:
	if (MIC_OFFLINE != mdev->state) {
		rc = -EINVAL;
		goto unlock_ret;
	}
	if (!mdev->ops->is_fw_ready(mdev)) {
		mic_reset(mdev);
		/*
		 * The state will either be MIC_OFFLINE if the reset succeeded
		 * or MIC_RESET_FAILED if the firmware reset failed.
		 */
		goto retry;
	}
	rc = mdev->ops->load_mic_fw(mdev, buf);
	if (rc)
		goto unlock_ret;
	mic_smpt_restore(mdev);
	mic_intr_restore(mdev);
	mdev->intr_ops->enable_interrupts(mdev);
	mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr);
	mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
	mdev->ops->send_firmware_intr(mdev);
	mic_set_state(mdev, MIC_ONLINE);
unlock_ret:
	mutex_unlock(&mdev->mic_mutex);
	return rc;
}

/**
 * mic_stop - Prepare the MIC for reset and trigger reset.
 * @mdev: pointer to mic_device instance
 * @force: force a MIC to reset even if it is already offline.
 *
 * RETURNS: None.
 */
void mic_stop(struct mic_device *mdev, bool force)
{
	mutex_lock(&mdev->mic_mutex);
	if (MIC_OFFLINE != mdev->state || force) {
		mic_virtio_reset_devices(mdev);
		mic_bootparam_init(mdev);
		mic_reset(mdev);
		if (MIC_RESET_FAILED == mdev->state)
			goto unlock;
		mic_set_shutdown_status(mdev, MIC_NOP);
		if (MIC_SUSPENDED != mdev->state)
			mic_set_state(mdev, MIC_OFFLINE);
	}
unlock:
	mutex_unlock(&mdev->mic_mutex);
}

/**
 * mic_shutdown - Initiate MIC shutdown.
 * @mdev: pointer to mic_device instance
 *
 * RETURNS: None.
 */
void mic_shutdown(struct mic_device *mdev)
{
	struct mic_bootparam *bootparam = mdev->dp;
	s8 db = bootparam->h2c_shutdown_db;

	mutex_lock(&mdev->mic_mutex);
	if (MIC_ONLINE == mdev->state && db != -1) {
		bootparam->shutdown_card = 1;
		mdev->ops->send_intr(mdev, db);
		mic_set_state(mdev, MIC_SHUTTING_DOWN);
	}
	mutex_unlock(&mdev->mic_mutex);
}

/**
 * mic_shutdown_work - Handle shutdown interrupt from MIC.
 * @work: The work structure.
 *
 * This work is scheduled whenever the host has received a shutdown
 * interrupt from the MIC.
 */
void mic_shutdown_work(struct work_struct *work)
{
	struct mic_device *mdev = container_of(work, struct mic_device,
			shutdown_work);
	struct mic_bootparam *bootparam = mdev->dp;

	mutex_lock(&mdev->mic_mutex);
	mic_set_shutdown_status(mdev, bootparam->shutdown_status);
	bootparam->shutdown_status = 0;

	/*
	 * if state is MIC_SUSPENDED, OSPM suspend is in progress. We do not
	 * change the state here so as to prevent users from booting the card
	 * during and after the suspend operation.
	 */
	if (MIC_SHUTTING_DOWN != mdev->state &&
	    MIC_SUSPENDED != mdev->state)
		mic_set_state(mdev, MIC_SHUTTING_DOWN);
	mutex_unlock(&mdev->mic_mutex);
}

/**
 * mic_reset_trigger_work - Trigger MIC reset.
 * @work: The work structure.
 *
 * This work is scheduled whenever the host wants to reset the MIC.
 */
void mic_reset_trigger_work(struct work_struct *work)
{
	struct mic_device *mdev = container_of(work, struct mic_device,
			reset_trigger_work);

	mic_stop(mdev, false);
}

/**
 * mic_complete_resume - Complete MIC Resume after an OSPM suspend/hibernate
 * event.
 * @mdev: pointer to mic_device instance
 *
 * RETURNS: None.
 */
void mic_complete_resume(struct mic_device *mdev)
{
	if (mdev->state != MIC_SUSPENDED) {
		dev_warn(mdev->sdev->parent, "state %d should be %d\n",
			 mdev->state, MIC_SUSPENDED);
		return;
	}

	/* Make sure firmware is ready */
	if (!mdev->ops->is_fw_ready(mdev))
		mic_stop(mdev, true);

	mutex_lock(&mdev->mic_mutex);
	mic_set_state(mdev, MIC_OFFLINE);
	mutex_unlock(&mdev->mic_mutex);
}

/**
 * mic_prepare_suspend - Handle suspend notification for the MIC device.
 * @mdev: pointer to mic_device instance
 *
 * RETURNS: None.
 */
void mic_prepare_suspend(struct mic_device *mdev)
{
	int rc;

#define MIC_SUSPEND_TIMEOUT (60 * HZ)

	mutex_lock(&mdev->mic_mutex);
	switch (mdev->state) {
	case MIC_OFFLINE:
		/*
		 * Card is already offline. Set state to MIC_SUSPENDED
		 * to prevent users from booting the card.
		 */
		mic_set_state(mdev, MIC_SUSPENDED);
		mutex_unlock(&mdev->mic_mutex);
		break;
	case MIC_ONLINE:
		/*
		 * Card is online. Set state to MIC_SUSPENDING and notify
		 * MIC user space daemon which will issue card
		 * shutdown and reset.
		 */
		mic_set_state(mdev, MIC_SUSPENDING);
		mutex_unlock(&mdev->mic_mutex);
		rc = wait_for_completion_timeout(&mdev->reset_wait,
						MIC_SUSPEND_TIMEOUT);
		/* Force reset the card if the shutdown completion timed out */
		if (!rc) {
			mutex_lock(&mdev->mic_mutex);
			mic_set_state(mdev, MIC_SUSPENDED);
			mutex_unlock(&mdev->mic_mutex);
			mic_stop(mdev, true);
		}
		break;
	case MIC_SHUTTING_DOWN:
		/*
		 * Card is shutting down. Set state to MIC_SUSPENDED
		 * to prevent further boot of the card.
		 */
		mic_set_state(mdev, MIC_SUSPENDED);
		mutex_unlock(&mdev->mic_mutex);
		rc = wait_for_completion_timeout(&mdev->reset_wait,
						MIC_SUSPEND_TIMEOUT);
		/* Force reset the card if the shutdown completion timed out */
		if (!rc)
			mic_stop(mdev, true);
		break;
	default:
		mutex_unlock(&mdev->mic_mutex);
		break;
	}
}

/**
 * mic_suspend - Initiate MIC suspend. Suspend merely issues card shutdown.
 * @mdev: pointer to mic_device instance
 *
 * RETURNS: None.
 */
void mic_suspend(struct mic_device *mdev)
{
	struct mic_bootparam *bootparam = mdev->dp;
	s8 db = bootparam->h2c_shutdown_db;

	mutex_lock(&mdev->mic_mutex);
	if (MIC_SUSPENDING == mdev->state && db != -1) {
		bootparam->shutdown_card = 1;
		mdev->ops->send_intr(mdev, db);
		mic_set_state(mdev, MIC_SUSPENDED);
	}
	mutex_unlock(&mdev->mic_mutex);
}