1 /*
2 * Copyright (C) 2012 Red Hat
3 *
4 * based in parts on udlfb.c:
5 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
6 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
7 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
8 *
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License v2. See the file COPYING in the main directory of this archive for
11 * more details.
12 */
13 #include <drm/drmP.h>
14 #include "udl_drv.h"
15
16 /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
17 #define BULK_SIZE 512
18
19 #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
20 #define WRITES_IN_FLIGHT (4)
21 #define MAX_VENDOR_DESCRIPTOR_SIZE 256
22
23 #define GET_URB_TIMEOUT HZ
24 #define FREE_URB_TIMEOUT (HZ*2)
25
udl_parse_vendor_descriptor(struct drm_device * dev,struct usb_device * usbdev)26 static int udl_parse_vendor_descriptor(struct drm_device *dev,
27 struct usb_device *usbdev)
28 {
29 struct udl_device *udl = dev->dev_private;
30 char *desc;
31 char *buf;
32 char *desc_end;
33
34 u8 total_len = 0;
35
36 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);
37 if (!buf)
38 return false;
39 desc = buf;
40
41 total_len = usb_get_descriptor(usbdev, 0x5f, /* vendor specific */
42 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);
43 if (total_len > 5) {
44 DRM_INFO("vendor descriptor length:%x data:%11ph\n",
45 total_len, desc);
46
47 if ((desc[0] != total_len) || /* descriptor length */
48 (desc[1] != 0x5f) || /* vendor descriptor type */
49 (desc[2] != 0x01) || /* version (2 bytes) */
50 (desc[3] != 0x00) ||
51 (desc[4] != total_len - 2)) /* length after type */
52 goto unrecognized;
53
54 desc_end = desc + total_len;
55 desc += 5; /* the fixed header we've already parsed */
56
57 while (desc < desc_end) {
58 u8 length;
59 u16 key;
60
61 key = le16_to_cpu(*((u16 *) desc));
62 desc += sizeof(u16);
63 length = *desc;
64 desc++;
65
66 switch (key) {
67 case 0x0200: { /* max_area */
68 u32 max_area;
69 max_area = le32_to_cpu(*((u32 *)desc));
70 DRM_DEBUG("DL chip limited to %d pixel modes\n",
71 max_area);
72 udl->sku_pixel_limit = max_area;
73 break;
74 }
75 default:
76 break;
77 }
78 desc += length;
79 }
80 }
81
82 goto success;
83
84 unrecognized:
85 /* allow udlfb to load for now even if firmware unrecognized */
86 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
87
88 success:
89 kfree(buf);
90 return true;
91 }
92
udl_release_urb_work(struct work_struct * work)93 static void udl_release_urb_work(struct work_struct *work)
94 {
95 struct urb_node *unode = container_of(work, struct urb_node,
96 release_urb_work.work);
97
98 up(&unode->dev->urbs.limit_sem);
99 }
100
udl_urb_completion(struct urb * urb)101 void udl_urb_completion(struct urb *urb)
102 {
103 struct urb_node *unode = urb->context;
104 struct udl_device *udl = unode->dev;
105 unsigned long flags;
106
107 /* sync/async unlink faults aren't errors */
108 if (urb->status) {
109 if (!(urb->status == -ENOENT ||
110 urb->status == -ECONNRESET ||
111 urb->status == -ESHUTDOWN)) {
112 DRM_ERROR("%s - nonzero write bulk status received: %d\n",
113 __func__, urb->status);
114 atomic_set(&udl->lost_pixels, 1);
115 }
116 }
117
118 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
119
120 spin_lock_irqsave(&udl->urbs.lock, flags);
121 list_add_tail(&unode->entry, &udl->urbs.list);
122 udl->urbs.available++;
123 spin_unlock_irqrestore(&udl->urbs.lock, flags);
124
125 #if 0
126 /*
127 * When using fb_defio, we deadlock if up() is called
128 * while another is waiting. So queue to another process.
129 */
130 if (fb_defio)
131 schedule_delayed_work(&unode->release_urb_work, 0);
132 else
133 #endif
134 up(&udl->urbs.limit_sem);
135 }
136
udl_free_urb_list(struct drm_device * dev)137 static void udl_free_urb_list(struct drm_device *dev)
138 {
139 struct udl_device *udl = dev->dev_private;
140 int count = udl->urbs.count;
141 struct list_head *node;
142 struct urb_node *unode;
143 struct urb *urb;
144 unsigned long flags;
145
146 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
147
148 /* keep waiting and freeing, until we've got 'em all */
149 while (count--) {
150 down(&udl->urbs.limit_sem);
151
152 spin_lock_irqsave(&udl->urbs.lock, flags);
153
154 node = udl->urbs.list.next; /* have reserved one with sem */
155 list_del_init(node);
156
157 spin_unlock_irqrestore(&udl->urbs.lock, flags);
158
159 unode = list_entry(node, struct urb_node, entry);
160 urb = unode->urb;
161
162 /* Free each separately allocated piece */
163 usb_free_coherent(urb->dev, udl->urbs.size,
164 urb->transfer_buffer, urb->transfer_dma);
165 usb_free_urb(urb);
166 kfree(node);
167 }
168 udl->urbs.count = 0;
169 }
170
udl_alloc_urb_list(struct drm_device * dev,int count,size_t size)171 static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
172 {
173 struct udl_device *udl = dev->dev_private;
174 struct urb *urb;
175 struct urb_node *unode;
176 char *buf;
177 size_t wanted_size = count * size;
178
179 spin_lock_init(&udl->urbs.lock);
180
181 retry:
182 udl->urbs.size = size;
183 INIT_LIST_HEAD(&udl->urbs.list);
184
185 sema_init(&udl->urbs.limit_sem, 0);
186 udl->urbs.count = 0;
187 udl->urbs.available = 0;
188
189 while (udl->urbs.count * size < wanted_size) {
190 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
191 if (!unode)
192 break;
193 unode->dev = udl;
194
195 INIT_DELAYED_WORK(&unode->release_urb_work,
196 udl_release_urb_work);
197
198 urb = usb_alloc_urb(0, GFP_KERNEL);
199 if (!urb) {
200 kfree(unode);
201 break;
202 }
203 unode->urb = urb;
204
205 buf = usb_alloc_coherent(udl->udev, size, GFP_KERNEL,
206 &urb->transfer_dma);
207 if (!buf) {
208 kfree(unode);
209 usb_free_urb(urb);
210 if (size > PAGE_SIZE) {
211 size /= 2;
212 udl_free_urb_list(dev);
213 goto retry;
214 }
215 break;
216 }
217
218 /* urb->transfer_buffer_length set to actual before submit */
219 usb_fill_bulk_urb(urb, udl->udev, usb_sndbulkpipe(udl->udev, 1),
220 buf, size, udl_urb_completion, unode);
221 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
222
223 list_add_tail(&unode->entry, &udl->urbs.list);
224
225 up(&udl->urbs.limit_sem);
226 udl->urbs.count++;
227 udl->urbs.available++;
228 }
229
230 DRM_DEBUG("allocated %d %d byte urbs\n", udl->urbs.count, (int) size);
231
232 return udl->urbs.count;
233 }
234
udl_get_urb(struct drm_device * dev)235 struct urb *udl_get_urb(struct drm_device *dev)
236 {
237 struct udl_device *udl = dev->dev_private;
238 int ret = 0;
239 struct list_head *entry;
240 struct urb_node *unode;
241 struct urb *urb = NULL;
242 unsigned long flags;
243
244 /* Wait for an in-flight buffer to complete and get re-queued */
245 ret = down_timeout(&udl->urbs.limit_sem, GET_URB_TIMEOUT);
246 if (ret) {
247 atomic_set(&udl->lost_pixels, 1);
248 DRM_INFO("wait for urb interrupted: %x available: %d\n",
249 ret, udl->urbs.available);
250 goto error;
251 }
252
253 spin_lock_irqsave(&udl->urbs.lock, flags);
254
255 BUG_ON(list_empty(&udl->urbs.list)); /* reserved one with limit_sem */
256 entry = udl->urbs.list.next;
257 list_del_init(entry);
258 udl->urbs.available--;
259
260 spin_unlock_irqrestore(&udl->urbs.lock, flags);
261
262 unode = list_entry(entry, struct urb_node, entry);
263 urb = unode->urb;
264
265 error:
266 return urb;
267 }
268
udl_submit_urb(struct drm_device * dev,struct urb * urb,size_t len)269 int udl_submit_urb(struct drm_device *dev, struct urb *urb, size_t len)
270 {
271 struct udl_device *udl = dev->dev_private;
272 int ret;
273
274 BUG_ON(len > udl->urbs.size);
275
276 urb->transfer_buffer_length = len; /* set to actual payload len */
277 ret = usb_submit_urb(urb, GFP_ATOMIC);
278 if (ret) {
279 udl_urb_completion(urb); /* because no one else will */
280 atomic_set(&udl->lost_pixels, 1);
281 DRM_ERROR("usb_submit_urb error %x\n", ret);
282 }
283 return ret;
284 }
285
udl_driver_load(struct drm_device * dev,unsigned long flags)286 int udl_driver_load(struct drm_device *dev, unsigned long flags)
287 {
288 struct usb_device *udev = (void*)flags;
289 struct udl_device *udl;
290 int ret = -ENOMEM;
291
292 DRM_DEBUG("\n");
293 udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
294 if (!udl)
295 return -ENOMEM;
296
297 udl->udev = udev;
298 udl->ddev = dev;
299 dev->dev_private = udl;
300
301 if (!udl_parse_vendor_descriptor(dev, udl->udev)) {
302 ret = -ENODEV;
303 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
304 goto err;
305 }
306
307 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
308 DRM_ERROR("udl_alloc_urb_list failed\n");
309 goto err;
310 }
311
312 DRM_DEBUG("\n");
313 ret = udl_modeset_init(dev);
314 if (ret)
315 goto err;
316
317 ret = udl_fbdev_init(dev);
318 if (ret)
319 goto err;
320
321 ret = drm_vblank_init(dev, 1);
322 if (ret)
323 goto err_fb;
324
325 return 0;
326 err_fb:
327 udl_fbdev_cleanup(dev);
328 err:
329 if (udl->urbs.count)
330 udl_free_urb_list(dev);
331 kfree(udl);
332 DRM_ERROR("%d\n", ret);
333 return ret;
334 }
335
udl_drop_usb(struct drm_device * dev)336 int udl_drop_usb(struct drm_device *dev)
337 {
338 udl_free_urb_list(dev);
339 return 0;
340 }
341
udl_driver_unload(struct drm_device * dev)342 int udl_driver_unload(struct drm_device *dev)
343 {
344 struct udl_device *udl = dev->dev_private;
345
346 drm_vblank_cleanup(dev);
347
348 if (udl->urbs.count)
349 udl_free_urb_list(dev);
350
351 udl_fbdev_cleanup(dev);
352 udl_modeset_cleanup(dev);
353 kfree(udl);
354 return 0;
355 }
356