summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/udl/udl_main.c
blob: 1f6dbfd62c2a4336eb2c21bb0170e3738e6fbfd4 (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
/*
 * Copyright (C) 2012 Red Hat
 *
 * based in parts on udlfb.c:
 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License v2. See the file COPYING in the main directory of this archive for
 * more details.
 */
#include <drm/drmP.h>
#include "udl_drv.h"

/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
#define BULK_SIZE 512

#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
#define WRITES_IN_FLIGHT (4)
#define MAX_VENDOR_DESCRIPTOR_SIZE 256

#define GET_URB_TIMEOUT	HZ
#define FREE_URB_TIMEOUT (HZ*2)

static int udl_parse_vendor_descriptor(struct drm_device *dev,
				       struct usb_device *usbdev)
{
	struct udl_device *udl = dev->dev_private;
	char *desc;
	char *buf;
	char *desc_end;

	u8 total_len = 0;

	buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
	if (!buf)
		return false;
	desc = buf;

	total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
				    0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
	if (total_len > 5) {
		DRM_INFO("vendor descriptor length:%x data:%02x %02x %02x %02x" \
			"%02x %02x %02x %02x %02x %02x %02x\n",
			total_len, desc[0],
			desc[1], desc[2], desc[3], desc[4], desc[5], desc[6],
			desc[7], desc[8], desc[9], desc[10]);

		if ((desc[0] != total_len) || /* descriptor length */
		    (desc[1] != 0x5f) ||   /* vendor descriptor type */
		    (desc[2] != 0x01) ||   /* version (2 bytes) */
		    (desc[3] != 0x00) ||
		    (desc[4] != total_len - 2)) /* length after type */
			goto unrecognized;

		desc_end = desc + total_len;
		desc += 5; /* the fixed header we've already parsed */

		while (desc < desc_end) {
			u8 length;
			u16 key;

			key = le16_to_cpu(*((u16 *) desc));
			desc += sizeof(u16);
			length = *desc;
			desc++;

			switch (key) {
			case 0x0200: { /* max_area */
				u32 max_area;
				max_area = le32_to_cpu(*((u32 *)desc));
				DRM_DEBUG("DL chip limited to %d pixel modes\n",
					max_area);
				udl->sku_pixel_limit = max_area;
				break;
			}
			default:
				break;
			}
			desc += length;
		}
	}

	goto success;

unrecognized:
	/* allow udlfb to load for now even if firmware unrecognized */
	DRM_ERROR("Unrecognized vendor firmware descriptor\n");

success:
	kfree(buf);
	return true;
}

static void udl_release_urb_work(struct work_struct *work)
{
	struct urb_node *unode = container_of(work, struct urb_node,
					      release_urb_work.work);

	up(&unode->dev->urbs.limit_sem);
}

void udl_urb_completion(struct urb *urb)
{
	struct urb_node *unode = urb->context;
	struct udl_device *udl = unode->dev;
	unsigned long flags;

	/* sync/async unlink faults aren't errors */
	if (urb->status) {
		if (!(urb->status == -ENOENT ||
		    urb->status == -ECONNRESET ||
		    urb->status == -ESHUTDOWN)) {
			DRM_ERROR("%s - nonzero write bulk status received: %d\n",
				__func__, urb->status);
			atomic_set(&udl->lost_pixels, 1);
		}
	}

	urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */

	spin_lock_irqsave(&udl->urbs.lock, flags);
	list_add_tail(&unode->entry, &udl->urbs.list);
	udl->urbs.available++;
	spin_unlock_irqrestore(&udl->urbs.lock, flags);

#if 0
	/*
	 * When using fb_defio, we deadlock if up() is called
	 * while another is waiting. So queue to another process.
	 */
	if (fb_defio)
		schedule_delayed_work(&unode->release_urb_work, 0);
	else
#endif
		up(&udl->urbs.limit_sem);
}

static void udl_free_urb_list(struct drm_device *dev)
{
	struct udl_device *udl = dev->dev_private;
	int count = udl->urbs.count;
	struct list_head *node;
	struct urb_node *unode;
	struct urb *urb;
	int ret;
	unsigned long flags;

	DRM_DEBUG("Waiting for completes and freeing all render urbs\n");

	/* keep waiting and freeing, until we've got 'em all */
	while (count--) {

		/* Getting interrupted means a leak, but ok at shutdown*/
		ret = down_interruptible(&udl->urbs.limit_sem);
		if (ret)
			break;

		spin_lock_irqsave(&udl->urbs.lock, flags);

		node = udl->urbs.list.next; /* have reserved one with sem */
		list_del_init(node);

		spin_unlock_irqrestore(&udl->urbs.lock, flags);

		unode = list_entry(node, struct urb_node, entry);
		urb = unode->urb;

		/* Free each separately allocated piece */
		usb_free_coherent(urb->dev, udl->urbs.size,
				  urb->transfer_buffer, urb->transfer_dma);
		usb_free_urb(urb);
		kfree(node);
	}
	udl->urbs.count = 0;
}

static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
{
	struct udl_device *udl = dev->dev_private;
	int i = 0;
	struct urb *urb;
	struct urb_node *unode;
	char *buf;

	spin_lock_init(&udl->urbs.lock);

	udl->urbs.size = size;
	INIT_LIST_HEAD(&udl->urbs.list);

	while (i < count) {
		unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
		if (!unode)
			break;
		unode->dev = udl;

		INIT_DELAYED_WORK(&unode->release_urb_work,
			  udl_release_urb_work);

		urb = usb_alloc_urb(0, GFP_KERNEL);
		if (!urb) {
			kfree(unode);
			break;
		}
		unode->urb = urb;

		buf = usb_alloc_coherent(udl->ddev->usbdev, MAX_TRANSFER, GFP_KERNEL,
					 &urb->transfer_dma);
		if (!buf) {
			kfree(unode);
			usb_free_urb(urb);
			break;
		}

		/* urb->transfer_buffer_length set to actual before submit */
		usb_fill_bulk_urb(urb, udl->ddev->usbdev, usb_sndbulkpipe(udl->ddev->usbdev, 1),
			buf, size, udl_urb_completion, unode);
		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;

		list_add_tail(&unode->entry, &udl->urbs.list);

		i++;
	}

	sema_init(&udl->urbs.limit_sem, i);
	udl->urbs.count = i;
	udl->urbs.available = i;

	DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);

	return i;
}

struct urb *udl_get_urb(struct drm_device *dev)
{
	struct udl_device *udl = dev->dev_private;
	int ret = 0;
	struct list_head *entry;
	struct urb_node *unode;
	struct urb *urb = NULL;
	unsigned long flags;

	/* Wait for an in-flight buffer to complete and get re-queued */
	ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
	if (ret) {
		atomic_set(&udl->lost_pixels, 1);
		DRM_INFO("wait for urb interrupted: %x available: %d\n",
		       ret, udl->urbs.available);
		goto error;
	}

	spin_lock_irqsave(&udl->urbs.lock, flags);

	BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
	entry = udl->urbs.list.next;
	list_del_init(entry);
	udl->urbs.available--;

	spin_unlock_irqrestore(&udl->urbs.lock, flags);

	unode = list_entry(entry, struct urb_node, entry);
	urb = unode->urb;

error:
	return urb;
}

int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
{
	struct udl_device *udl = dev->dev_private;
	int ret;

	BUG_ON(len > udl->urbs.size);

	urb->transfer_buffer_length = len; /* set to actual payload len */
	ret = usb_submit_urb(urb, GFP_ATOMIC);
	if (ret) {
		udl_urb_completion(urb); /* because no one else will */
		atomic_set(&udl->lost_pixels, 1);
		DRM_ERROR("usb_submit_urb error %x\n", ret);
	}
	return ret;
}

int udl_driver_load(struct drm_device *dev, unsigned long flags)
{
	struct udl_device *udl;
	int ret;

	DRM_DEBUG("\n");
	udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
	if (!udl)
		return -ENOMEM;

	udl->ddev = dev;
	dev->dev_private = udl;

	if (!udl_parse_vendor_descriptor(dev, dev->usbdev)) {
		DRM_ERROR("firmware not recognized. Assume incompatible device\n");
		goto err;
	}

	if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
		ret = -ENOMEM;
		DRM_ERROR("udl_alloc_urb_list failed\n");
		goto err;
	}

	DRM_DEBUG("\n");
	ret = udl_modeset_init(dev);

	ret = udl_fbdev_init(dev);
	return 0;
err:
	kfree(udl);
	DRM_ERROR("%d\n", ret);
	return ret;
}

int udl_drop_usb(struct drm_device *dev)
{
	udl_free_urb_list(dev);
	return 0;
}

int udl_driver_unload(struct drm_device *dev)
{
	struct udl_device *udl = dev->dev_private;

	if (udl->urbs.count)
		udl_free_urb_list(dev);

	udl_fbdev_cleanup(dev);
	udl_modeset_cleanup(dev);
	kfree(udl);
	return 0;
}