1/**
2 * \file drm_drawable.c
3 * IOCTLs for drawables
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 * \author Michel D��nzer <michel@tungstengraphics.com>
8 */
9
10/*
11 * Created: Tue Feb  2 08:37:54 1999 by faith@valinux.com
12 *
13 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
14 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
15 * Copyright 2006 Tungsten Graphics, Inc., Bismarck, North Dakota.
16 * All Rights Reserved.
17 *
18 * Permission is hereby granted, free of charge, to any person obtaining a
19 * copy of this software and associated documentation files (the "Software"),
20 * to deal in the Software without restriction, including without limitation
21 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
22 * and/or sell copies of the Software, and to permit persons to whom the
23 * Software is furnished to do so, subject to the following conditions:
24 *
25 * The above copyright notice and this permission notice (including the next
26 * paragraph) shall be included in all copies or substantial portions of the
27 * Software.
28 *
29 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
30 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
31 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
32 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
33 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
34 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
35 * OTHER DEALINGS IN THE SOFTWARE.
36 */
37
38#include "drmP.h"
39
40/**
41 * Allocate drawable ID and memory to store information about it.
42 */
43int drm_adddraw(DRM_IOCTL_ARGS)
44{
45	DRM_DEVICE;
46	unsigned long irqflags;
47	int i, j;
48	u32 *bitfield = dev->drw_bitfield;
49	unsigned int bitfield_length = dev->drw_bitfield_length;
50	drm_drawable_info_t **info = dev->drw_info;
51	unsigned int info_length = dev->drw_info_length;
52	drm_draw_t draw;
53
54	for (i = 0, j = 0; i < bitfield_length; i++) {
55		if (bitfield[i] == ~0)
56			continue;
57
58		for (; j < 8 * sizeof(*bitfield); j++)
59			if (!(bitfield[i] & (1 << j)))
60				goto done;
61	}
62done:
63
64	if (i == bitfield_length) {
65		bitfield_length++;
66
67		bitfield = drm_alloc(bitfield_length * sizeof(*bitfield),
68				     DRM_MEM_BUFS);
69
70		if (!bitfield) {
71			DRM_ERROR("Failed to allocate new drawable bitfield\n");
72			return DRM_ERR(ENOMEM);
73		}
74
75		if (8 * sizeof(*bitfield) * bitfield_length > info_length) {
76			info_length += 8 * sizeof(*bitfield);
77
78			info = drm_alloc(info_length * sizeof(*info),
79					 DRM_MEM_BUFS);
80
81			if (!info) {
82				DRM_ERROR("Failed to allocate new drawable info"
83					  " array\n");
84
85				drm_free(bitfield,
86					 bitfield_length * sizeof(*bitfield),
87					 DRM_MEM_BUFS);
88				return DRM_ERR(ENOMEM);
89			}
90		}
91
92		bitfield[i] = 0;
93	}
94
95	draw.handle = i * 8 * sizeof(*bitfield) + j + 1;
96	DRM_DEBUG("%d\n", draw.handle);
97
98	spin_lock_irqsave(&dev->drw_lock, irqflags);
99
100	bitfield[i] |= 1 << j;
101	info[draw.handle - 1] = NULL;
102
103	if (bitfield != dev->drw_bitfield) {
104		memcpy(bitfield, dev->drw_bitfield, dev->drw_bitfield_length *
105		       sizeof(*bitfield));
106		drm_free(dev->drw_bitfield, sizeof(*bitfield) *
107			 dev->drw_bitfield_length, DRM_MEM_BUFS);
108		dev->drw_bitfield = bitfield;
109		dev->drw_bitfield_length = bitfield_length;
110	}
111
112	if (info != dev->drw_info) {
113		memcpy(info, dev->drw_info, dev->drw_info_length *
114		       sizeof(*info));
115		drm_free(dev->drw_info, sizeof(*info) * dev->drw_info_length,
116			 DRM_MEM_BUFS);
117		dev->drw_info = info;
118		dev->drw_info_length = info_length;
119	}
120
121	spin_unlock_irqrestore(&dev->drw_lock, irqflags);
122
123	DRM_COPY_TO_USER_IOCTL((drm_draw_t __user *)data, draw, sizeof(draw));
124
125	return 0;
126}
127
128/**
129 * Free drawable ID and memory to store information about it.
130 */
131int drm_rmdraw(DRM_IOCTL_ARGS)
132{
133	DRM_DEVICE;
134	drm_draw_t draw;
135 	int id, idx;
136 	unsigned int shift;
137	unsigned long irqflags;
138	u32 *bitfield = dev->drw_bitfield;
139	unsigned int bitfield_length = dev->drw_bitfield_length;
140	drm_drawable_info_t **info = dev->drw_info;
141	unsigned int info_length = dev->drw_info_length;
142
143	DRM_COPY_FROM_USER_IOCTL(draw, (drm_draw_t __user *) data,
144				 sizeof(draw));
145
146	id = draw.handle - 1;
147	idx = id / (8 * sizeof(*bitfield));
148	shift = id % (8 * sizeof(*bitfield));
149
150	if (idx < 0 || idx >= bitfield_length ||
151	    !(bitfield[idx] & (1 << shift))) {
152		DRM_DEBUG("No such drawable %d\n", draw.handle);
153		return 0;
154	}
155
156	spin_lock_irqsave(&dev->drw_lock, irqflags);
157
158	bitfield[idx] &= ~(1 << shift);
159
160	spin_unlock_irqrestore(&dev->drw_lock, irqflags);
161
162	if (info[id]) {
163		drm_free(info[id]->rects, info[id]->num_rects *
164			 sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
165		drm_free(info[id], sizeof(**info), DRM_MEM_BUFS);
166	}
167
168	/* Can we shrink the arrays? */
169	if (idx == bitfield_length - 1) {
170		while (idx >= 0 && !bitfield[idx])
171			--idx;
172
173		bitfield_length = idx + 1;
174
175		bitfield = NULL;
176
177		if (bitfield_length) {
178			if (bitfield_length != dev->drw_bitfield_length)
179				bitfield = drm_alloc(bitfield_length *
180						     sizeof(*bitfield),
181						     DRM_MEM_BUFS);
182
183			if (!bitfield) {
184				bitfield = dev->drw_bitfield;
185				bitfield_length = dev->drw_bitfield_length;
186			}
187		}
188	}
189
190	if (bitfield != dev->drw_bitfield) {
191		info_length = 8 * sizeof(*bitfield) * bitfield_length;
192
193		if (info_length) {
194			info = drm_alloc(info_length * sizeof(*info),
195					 DRM_MEM_BUFS);
196
197			if (!info) {
198				info = dev->drw_info;
199				info_length = dev->drw_info_length;
200			}
201		} else
202			info = NULL;
203
204		spin_lock_irqsave(&dev->drw_lock, irqflags);
205
206		if (bitfield)
207			memcpy(bitfield, dev->drw_bitfield, bitfield_length *
208			       sizeof(*bitfield));
209		drm_free(dev->drw_bitfield, sizeof(*bitfield) *
210			 dev->drw_bitfield_length, DRM_MEM_BUFS);
211		dev->drw_bitfield = bitfield;
212		dev->drw_bitfield_length = bitfield_length;
213
214		if (info != dev->drw_info) {
215			if (info)
216				memcpy(info, dev->drw_info, info_length *
217				       sizeof(*info));
218			drm_free(dev->drw_info, sizeof(*info) *
219				 dev->drw_info_length, DRM_MEM_BUFS);
220			dev->drw_info = info;
221			dev->drw_info_length = info_length;
222		}
223
224		spin_unlock_irqrestore(&dev->drw_lock, irqflags);
225	}
226
227	DRM_DEBUG("%d\n", draw.handle);
228	return 0;
229}
230
231int drm_update_drawable_info(DRM_IOCTL_ARGS) {
232	DRM_DEVICE;
233	drm_update_draw_t update;
234	unsigned int id, idx, shift;
235	u32 *bitfield = dev->drw_bitfield;
236	unsigned long irqflags, bitfield_length = dev->drw_bitfield_length;
237	drm_drawable_info_t *info;
238	drm_clip_rect_t *rects;
239	int err;
240
241	DRM_COPY_FROM_USER_IOCTL(update, (drm_update_draw_t __user *) data,
242				 sizeof(update));
243
244	id = update.handle - 1;
245	idx = id / (8 * sizeof(*bitfield));
246	shift = id % (8 * sizeof(*bitfield));
247
248	if (idx < 0 || idx >= bitfield_length ||
249	    !(bitfield[idx] & (1 << shift))) {
250		DRM_ERROR("No such drawable %d\n", update.handle);
251		return DRM_ERR(EINVAL);
252	}
253
254	info = dev->drw_info[id];
255
256	if (!info) {
257		info = drm_calloc(1, sizeof(drm_drawable_info_t), DRM_MEM_BUFS);
258
259		if (!info) {
260			DRM_ERROR("Failed to allocate drawable info memory\n");
261			return DRM_ERR(ENOMEM);
262		}
263	}
264
265	switch (update.type) {
266	case DRM_DRAWABLE_CLIPRECTS:
267		if (update.num != info->num_rects) {
268			rects = drm_alloc(update.num * sizeof(drm_clip_rect_t),
269					 DRM_MEM_BUFS);
270		} else
271			rects = info->rects;
272
273		if (update.num && !rects) {
274			DRM_ERROR("Failed to allocate cliprect memory\n");
275			err = DRM_ERR(ENOMEM);
276			goto error;
277		}
278
279		if (update.num && DRM_COPY_FROM_USER(rects,
280						     (drm_clip_rect_t __user *)
281						     (unsigned long)update.data,
282						     update.num *
283						     sizeof(*rects))) {
284			DRM_ERROR("Failed to copy cliprects from userspace\n");
285			err = DRM_ERR(EFAULT);
286			goto error;
287		}
288
289		spin_lock_irqsave(&dev->drw_lock, irqflags);
290
291		if (rects != info->rects) {
292			drm_free(info->rects, info->num_rects *
293				 sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
294		}
295
296		info->rects = rects;
297		info->num_rects = update.num;
298		dev->drw_info[id] = info;
299
300		spin_unlock_irqrestore(&dev->drw_lock, irqflags);
301
302		DRM_DEBUG("Updated %d cliprects for drawable %d\n",
303			  info->num_rects, id);
304		break;
305	default:
306		DRM_ERROR("Invalid update type %d\n", update.type);
307		return DRM_ERR(EINVAL);
308	}
309
310	return 0;
311
312error:
313	if (!dev->drw_info[id])
314		drm_free(info, sizeof(*info), DRM_MEM_BUFS);
315	else if (rects != dev->drw_info[id]->rects)
316		drm_free(rects, update.num *
317			 sizeof(drm_clip_rect_t), DRM_MEM_BUFS);
318
319	return err;
320}
321
322/**
323 * Caller must hold the drawable spinlock!
324 */
325drm_drawable_info_t *drm_get_drawable_info(drm_device_t *dev, drm_drawable_t id) {
326	u32 *bitfield = dev->drw_bitfield;
327	unsigned int idx, shift;
328
329	id--;
330	idx = id / (8 * sizeof(*bitfield));
331	shift = id % (8 * sizeof(*bitfield));
332
333	if (idx < 0 || idx >= dev->drw_bitfield_length ||
334	    !(bitfield[idx] & (1 << shift))) {
335		DRM_DEBUG("No such drawable %d\n", id);
336		return NULL;
337	}
338
339	return dev->drw_info[id];
340}
341EXPORT_SYMBOL(drm_get_drawable_info);
342