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 "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:%02x %02x %02x %02x" \
45 "%02x %02x %02x %02x %02x %02x %02x\n",
46 total_len, desc[0],
47 desc[1], desc[2], desc[3], desc[4], desc[5], desc[6],
48 desc[7], desc[8], desc[9], desc[10]);
49
50 if ((desc[0] != total_len) || /* descriptor length */
51 (desc[1] != 0x5f) || /* vendor descriptor type */
52 (desc[2] != 0x01) || /* version (2 bytes) */
53 (desc[3] != 0x00) ||
54 (desc[4] != total_len - 2)) /* length after type */
55 goto unrecognized;
56
57 desc_end = desc + total_len;
58 desc += 5; /* the fixed header we've already parsed */
59
60 while (desc < desc_end) {
61 u8 length;
62 u16 key;
63
64 key = *((u16 *) desc);
65 desc += sizeof(u16);
66 length = *desc;
67 desc++;
68
69 switch (key) {
70 case 0x0200: { /* max_area */
71 u32 max_area;
72 max_area = le32_to_cpu(*((u32 *)desc));
73 DRM_DEBUG("DL chip limited to %d pixel modes\n",
74 max_area);
75 udl->sku_pixel_limit = max_area;
76 break;
77 }
78 default:
79 break;
80 }
81 desc += length;
82 }
83 }
84
85 goto success;
86
87 unrecognized:
88 /* allow udlfb to load for now even if firmware unrecognized */
89 DRM_ERROR("Unrecognized vendor firmware descriptor\n");
90
91 success:
92 kfree(buf);
93 return true;
94 }
95
udl_release_urb_work(struct work_struct * work)96 static void udl_release_urb_work(struct work_struct *work)
97 {
98 struct urb_node *unode = container_of(work, struct urb_node,
99 release_urb_work.work);
100
101 up(&unode->dev->urbs.limit_sem);
102 }
103
udl_urb_completion(struct urb * urb)104 void udl_urb_completion(struct urb *urb)
105 {
106 struct urb_node *unode = urb->context;
107 struct udl_device *udl = unode->dev;
108 unsigned long flags;
109
110 /* sync/async unlink faults aren't errors */
111 if (urb->status) {
112 if (!(urb->status == -ENOENT ||
113 urb->status == -ECONNRESET ||
114 urb->status == -ESHUTDOWN)) {
115 DRM_ERROR("%s - nonzero write bulk status received: %d\n",
116 __func__, urb->status);
117 atomic_set(&udl->lost_pixels, 1);
118 }
119 }
120
121 urb->transfer_buffer_length = udl->urbs.size; /* reset to actual */
122
123 spin_lock_irqsave(&udl->urbs.lock, flags);
124 list_add_tail(&unode->entry, &udl->urbs.list);
125 udl->urbs.available++;
126 spin_unlock_irqrestore(&udl->urbs.lock, flags);
127
128 #if 0
129 /*
130 * When using fb_defio, we deadlock if up() is called
131 * while another is waiting. So queue to another process.
132 */
133 if (fb_defio)
134 schedule_delayed_work(&unode->release_urb_work, 0);
135 else
136 #endif
137 up(&udl->urbs.limit_sem);
138 }
139
udl_free_urb_list(struct drm_device * dev)140 static void udl_free_urb_list(struct drm_device *dev)
141 {
142 struct udl_device *udl = dev->dev_private;
143 int count = udl->urbs.count;
144 struct list_head *node;
145 struct urb_node *unode;
146 struct urb *urb;
147 int ret;
148 unsigned long flags;
149
150 DRM_DEBUG("Waiting for completes and freeing all render urbs\n");
151
152 /* keep waiting and freeing, until we've got 'em all */
153 while (count--) {
154
155 /* Getting interrupted means a leak, but ok at shutdown*/
156 ret = down_interruptible(&udl->urbs.limit_sem);
157 if (ret)
158 break;
159
160 spin_lock_irqsave(&udl->urbs.lock, flags);
161
162 node = udl->urbs.list.next; /* have reserved one with sem */
163 list_del_init(node);
164
165 spin_unlock_irqrestore(&udl->urbs.lock, flags);
166
167 unode = list_entry(node, struct urb_node, entry);
168 urb = unode->urb;
169
170 /* Free each separately allocated piece */
171 usb_free_coherent(urb->dev, udl->urbs.size,
172 urb->transfer_buffer, urb->transfer_dma);
173 usb_free_urb(urb);
174 kfree(node);
175 }
176 udl->urbs.count = 0;
177 }
178
udl_alloc_urb_list(struct drm_device * dev,int count,size_t size)179 static int udl_alloc_urb_list(struct drm_device *dev, int count, size_t size)
180 {
181 struct udl_device *udl = dev->dev_private;
182 int i = 0;
183 struct urb *urb;
184 struct urb_node *unode;
185 char *buf;
186
187 spin_lock_init(&udl->urbs.lock);
188
189 udl->urbs.size = size;
190 INIT_LIST_HEAD(&udl->urbs.list);
191
192 while (i < count) {
193 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
194 if (!unode)
195 break;
196 unode->dev = udl;
197
198 INIT_DELAYED_WORK(&unode->release_urb_work,
199 udl_release_urb_work);
200
201 urb = usb_alloc_urb(0, GFP_KERNEL);
202 if (!urb) {
203 kfree(unode);
204 break;
205 }
206 unode->urb = urb;
207
208 buf = usb_alloc_coherent(udl->ddev->usbdev, MAX_TRANSFER, GFP_KERNEL,
209 &urb->transfer_dma);
210 if (!buf) {
211 kfree(unode);
212 usb_free_urb(urb);
213 break;
214 }
215
216 /* urb->transfer_buffer_length set to actual before submit */
217 usb_fill_bulk_urb(urb, udl->ddev->usbdev, usb_sndbulkpipe(udl->ddev->usbdev, 1),
218 buf, size, udl_urb_completion, unode);
219 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
220
221 list_add_tail(&unode->entry, &udl->urbs.list);
222
223 i++;
224 }
225
226 sema_init(&udl->urbs.limit_sem, i);
227 udl->urbs.count = i;
228 udl->urbs.available = i;
229
230 DRM_DEBUG("allocated %d %d byte urbs\n", i, (int) size);
231
232 return i;
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 udl_device *udl;
289 int ret;
290
291 DRM_DEBUG("\n");
292 udl = kzalloc(sizeof(struct udl_device), GFP_KERNEL);
293 if (!udl)
294 return -ENOMEM;
295
296 udl->ddev = dev;
297 dev->dev_private = udl;
298
299 if (!udl_parse_vendor_descriptor(dev, dev->usbdev)) {
300 DRM_ERROR("firmware not recognized. Assume incompatible device\n");
301 goto err;
302 }
303
304 if (!udl_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
305 ret = -ENOMEM;
306 DRM_ERROR("udl_alloc_urb_list failed\n");
307 goto err;
308 }
309
310 DRM_DEBUG("\n");
311 ret = udl_modeset_init(dev);
312
313 ret = udl_fbdev_init(dev);
314 return 0;
315 err:
316 kfree(udl);
317 DRM_ERROR("%d\n", ret);
318 return ret;
319 }
320
udl_drop_usb(struct drm_device * dev)321 int udl_drop_usb(struct drm_device *dev)
322 {
323 udl_free_urb_list(dev);
324 return 0;
325 }
326
udl_driver_unload(struct drm_device * dev)327 int udl_driver_unload(struct drm_device *dev)
328 {
329 struct udl_device *udl = dev->dev_private;
330
331 if (udl->urbs.count)
332 udl_free_urb_list(dev);
333
334 udl_fbdev_cleanup(dev);
335 udl_modeset_cleanup(dev);
336 kfree(udl);
337 return 0;
338 }
339