drm/vmwgfx: Treat out-of-range initial width and height as host errors
[linux-2.6.git] / drivers / gpu / drm / vmwgfx / vmwgfx_ldu.c
1 /**************************************************************************
2  *
3  * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
4  * All Rights Reserved.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the
8  * "Software"), to deal in the Software without restriction, including
9  * without limitation the rights to use, copy, modify, merge, publish,
10  * distribute, sub license, and/or sell copies of the Software, and to
11  * permit persons to whom the Software is furnished to do so, subject to
12  * the following conditions:
13  *
14  * The above copyright notice and this permission notice (including the
15  * next paragraph) shall be included in all copies or substantial portions
16  * of the Software.
17  *
18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24  * USE OR OTHER DEALINGS IN THE SOFTWARE.
25  *
26  **************************************************************************/
27
28 #include "vmwgfx_kms.h"
29
30
31 #define vmw_crtc_to_ldu(x) \
32         container_of(x, struct vmw_legacy_display_unit, base.crtc)
33 #define vmw_encoder_to_ldu(x) \
34         container_of(x, struct vmw_legacy_display_unit, base.encoder)
35 #define vmw_connector_to_ldu(x) \
36         container_of(x, struct vmw_legacy_display_unit, base.connector)
37
38 struct vmw_legacy_display {
39         struct list_head active;
40
41         unsigned num_active;
42         unsigned last_num_active;
43
44         struct vmw_framebuffer *fb;
45 };
46
47 /**
48  * Display unit using the legacy register interface.
49  */
50 struct vmw_legacy_display_unit {
51         struct vmw_display_unit base;
52
53         struct list_head active;
54 };
55
56 static void vmw_ldu_destroy(struct vmw_legacy_display_unit *ldu)
57 {
58         list_del_init(&ldu->active);
59         vmw_display_unit_cleanup(&ldu->base);
60         kfree(ldu);
61 }
62
63
64 /*
65  * Legacy Display Unit CRTC functions
66  */
67
68 static void vmw_ldu_crtc_destroy(struct drm_crtc *crtc)
69 {
70         vmw_ldu_destroy(vmw_crtc_to_ldu(crtc));
71 }
72
73 static int vmw_ldu_commit_list(struct vmw_private *dev_priv)
74 {
75         struct vmw_legacy_display *lds = dev_priv->ldu_priv;
76         struct vmw_legacy_display_unit *entry;
77         struct vmw_display_unit *du = NULL;
78         struct drm_framebuffer *fb = NULL;
79         struct drm_crtc *crtc = NULL;
80         int i = 0, ret;
81
82         /* If there is no display topology the host just assumes
83          * that the guest will set the same layout as the host.
84          */
85         if (!(dev_priv->capabilities & SVGA_CAP_DISPLAY_TOPOLOGY)) {
86                 int w = 0, h = 0;
87                 list_for_each_entry(entry, &lds->active, active) {
88                         crtc = &entry->base.crtc;
89                         w = max(w, crtc->x + crtc->mode.hdisplay);
90                         h = max(h, crtc->y + crtc->mode.vdisplay);
91                         i++;
92                 }
93
94                 if (crtc == NULL)
95                         return 0;
96                 fb = entry->base.crtc.fb;
97
98                 return vmw_kms_write_svga(dev_priv, w, h, fb->pitches[0],
99                                           fb->bits_per_pixel, fb->depth);
100         }
101
102         if (!list_empty(&lds->active)) {
103                 entry = list_entry(lds->active.next, typeof(*entry), active);
104                 fb = entry->base.crtc.fb;
105
106                 vmw_kms_write_svga(dev_priv, fb->width, fb->height, fb->pitches[0],
107                                    fb->bits_per_pixel, fb->depth);
108         }
109
110         /* Make sure we always show something. */
111         vmw_write(dev_priv, SVGA_REG_NUM_GUEST_DISPLAYS,
112                   lds->num_active ? lds->num_active : 1);
113
114         i = 0;
115         list_for_each_entry(entry, &lds->active, active) {
116                 crtc = &entry->base.crtc;
117
118                 vmw_write(dev_priv, SVGA_REG_DISPLAY_ID, i);
119                 vmw_write(dev_priv, SVGA_REG_DISPLAY_IS_PRIMARY, !i);
120                 vmw_write(dev_priv, SVGA_REG_DISPLAY_POSITION_X, crtc->x);
121                 vmw_write(dev_priv, SVGA_REG_DISPLAY_POSITION_Y, crtc->y);
122                 vmw_write(dev_priv, SVGA_REG_DISPLAY_WIDTH, crtc->mode.hdisplay);
123                 vmw_write(dev_priv, SVGA_REG_DISPLAY_HEIGHT, crtc->mode.vdisplay);
124                 vmw_write(dev_priv, SVGA_REG_DISPLAY_ID, SVGA_ID_INVALID);
125
126                 i++;
127         }
128
129         BUG_ON(i != lds->num_active);
130
131         lds->last_num_active = lds->num_active;
132
133
134         /* Find the first du with a cursor. */
135         list_for_each_entry(entry, &lds->active, active) {
136                 du = &entry->base;
137
138                 if (!du->cursor_dmabuf)
139                         continue;
140
141                 ret = vmw_cursor_update_dmabuf(dev_priv,
142                                                du->cursor_dmabuf,
143                                                64, 64,
144                                                du->hotspot_x,
145                                                du->hotspot_y);
146                 if (ret == 0)
147                         break;
148
149                 DRM_ERROR("Could not update cursor image\n");
150         }
151
152         return 0;
153 }
154
155 static int vmw_ldu_del_active(struct vmw_private *vmw_priv,
156                               struct vmw_legacy_display_unit *ldu)
157 {
158         struct vmw_legacy_display *ld = vmw_priv->ldu_priv;
159         if (list_empty(&ldu->active))
160                 return 0;
161
162         /* Must init otherwise list_empty(&ldu->active) will not work. */
163         list_del_init(&ldu->active);
164         if (--(ld->num_active) == 0) {
165                 BUG_ON(!ld->fb);
166                 if (ld->fb->unpin)
167                         ld->fb->unpin(ld->fb);
168                 ld->fb = NULL;
169         }
170
171         return 0;
172 }
173
174 static int vmw_ldu_add_active(struct vmw_private *vmw_priv,
175                               struct vmw_legacy_display_unit *ldu,
176                               struct vmw_framebuffer *vfb)
177 {
178         struct vmw_legacy_display *ld = vmw_priv->ldu_priv;
179         struct vmw_legacy_display_unit *entry;
180         struct list_head *at;
181
182         BUG_ON(!ld->num_active && ld->fb);
183         if (vfb != ld->fb) {
184                 if (ld->fb && ld->fb->unpin)
185                         ld->fb->unpin(ld->fb);
186                 if (vfb->pin)
187                         vfb->pin(vfb);
188                 ld->fb = vfb;
189         }
190
191         if (!list_empty(&ldu->active))
192                 return 0;
193
194         at = &ld->active;
195         list_for_each_entry(entry, &ld->active, active) {
196                 if (entry->base.unit > ldu->base.unit)
197                         break;
198
199                 at = &entry->active;
200         }
201
202         list_add(&ldu->active, at);
203
204         ld->num_active++;
205
206         return 0;
207 }
208
209 static int vmw_ldu_crtc_set_config(struct drm_mode_set *set)
210 {
211         struct vmw_private *dev_priv;
212         struct vmw_legacy_display_unit *ldu;
213         struct drm_connector *connector;
214         struct drm_display_mode *mode;
215         struct drm_encoder *encoder;
216         struct vmw_framebuffer *vfb;
217         struct drm_framebuffer *fb;
218         struct drm_crtc *crtc;
219
220         if (!set)
221                 return -EINVAL;
222
223         if (!set->crtc)
224                 return -EINVAL;
225
226         /* get the ldu */
227         crtc = set->crtc;
228         ldu = vmw_crtc_to_ldu(crtc);
229         vfb = set->fb ? vmw_framebuffer_to_vfb(set->fb) : NULL;
230         dev_priv = vmw_priv(crtc->dev);
231
232         if (set->num_connectors > 1) {
233                 DRM_ERROR("to many connectors\n");
234                 return -EINVAL;
235         }
236
237         if (set->num_connectors == 1 &&
238             set->connectors[0] != &ldu->base.connector) {
239                 DRM_ERROR("connector doesn't match %p %p\n",
240                         set->connectors[0], &ldu->base.connector);
241                 return -EINVAL;
242         }
243
244         /* ldu only supports one fb active at the time */
245         if (dev_priv->ldu_priv->fb && vfb &&
246             !(dev_priv->ldu_priv->num_active == 1 &&
247               !list_empty(&ldu->active)) &&
248             dev_priv->ldu_priv->fb != vfb) {
249                 DRM_ERROR("Multiple framebuffers not supported\n");
250                 return -EINVAL;
251         }
252
253         /* since they always map one to one these are safe */
254         connector = &ldu->base.connector;
255         encoder = &ldu->base.encoder;
256
257         /* should we turn the crtc off? */
258         if (set->num_connectors == 0 || !set->mode || !set->fb) {
259
260                 connector->encoder = NULL;
261                 encoder->crtc = NULL;
262                 crtc->fb = NULL;
263
264                 vmw_ldu_del_active(dev_priv, ldu);
265
266                 return vmw_ldu_commit_list(dev_priv);
267         }
268
269
270         /* we now know we want to set a mode */
271         mode = set->mode;
272         fb = set->fb;
273
274         if (set->x + mode->hdisplay > fb->width ||
275             set->y + mode->vdisplay > fb->height) {
276                 DRM_ERROR("set outside of framebuffer\n");
277                 return -EINVAL;
278         }
279
280         vmw_fb_off(dev_priv);
281
282         crtc->fb = fb;
283         encoder->crtc = crtc;
284         connector->encoder = encoder;
285         crtc->x = set->x;
286         crtc->y = set->y;
287         crtc->mode = *mode;
288
289         vmw_ldu_add_active(dev_priv, ldu, vfb);
290
291         return vmw_ldu_commit_list(dev_priv);
292 }
293
294 static struct drm_crtc_funcs vmw_legacy_crtc_funcs = {
295         .save = vmw_du_crtc_save,
296         .restore = vmw_du_crtc_restore,
297         .cursor_set = vmw_du_crtc_cursor_set,
298         .cursor_move = vmw_du_crtc_cursor_move,
299         .gamma_set = vmw_du_crtc_gamma_set,
300         .destroy = vmw_ldu_crtc_destroy,
301         .set_config = vmw_ldu_crtc_set_config,
302 };
303
304
305 /*
306  * Legacy Display Unit encoder functions
307  */
308
309 static void vmw_ldu_encoder_destroy(struct drm_encoder *encoder)
310 {
311         vmw_ldu_destroy(vmw_encoder_to_ldu(encoder));
312 }
313
314 static struct drm_encoder_funcs vmw_legacy_encoder_funcs = {
315         .destroy = vmw_ldu_encoder_destroy,
316 };
317
318 /*
319  * Legacy Display Unit connector functions
320  */
321
322 static void vmw_ldu_connector_destroy(struct drm_connector *connector)
323 {
324         vmw_ldu_destroy(vmw_connector_to_ldu(connector));
325 }
326
327 static struct drm_connector_funcs vmw_legacy_connector_funcs = {
328         .dpms = vmw_du_connector_dpms,
329         .save = vmw_du_connector_save,
330         .restore = vmw_du_connector_restore,
331         .detect = vmw_du_connector_detect,
332         .fill_modes = vmw_du_connector_fill_modes,
333         .set_property = vmw_du_connector_set_property,
334         .destroy = vmw_ldu_connector_destroy,
335 };
336
337 static int vmw_ldu_init(struct vmw_private *dev_priv, unsigned unit)
338 {
339         struct vmw_legacy_display_unit *ldu;
340         struct drm_device *dev = dev_priv->dev;
341         struct drm_connector *connector;
342         struct drm_encoder *encoder;
343         struct drm_crtc *crtc;
344
345         ldu = kzalloc(sizeof(*ldu), GFP_KERNEL);
346         if (!ldu)
347                 return -ENOMEM;
348
349         ldu->base.unit = unit;
350         crtc = &ldu->base.crtc;
351         encoder = &ldu->base.encoder;
352         connector = &ldu->base.connector;
353
354         INIT_LIST_HEAD(&ldu->active);
355
356         ldu->base.pref_active = (unit == 0);
357         ldu->base.pref_width = dev_priv->initial_width;
358         ldu->base.pref_height = dev_priv->initial_height;
359         ldu->base.pref_mode = NULL;
360         ldu->base.is_implicit = true;
361
362         drm_connector_init(dev, connector, &vmw_legacy_connector_funcs,
363                            DRM_MODE_CONNECTOR_VIRTUAL);
364         connector->status = vmw_du_connector_detect(connector, true);
365
366         drm_encoder_init(dev, encoder, &vmw_legacy_encoder_funcs,
367                          DRM_MODE_ENCODER_VIRTUAL);
368         drm_mode_connector_attach_encoder(connector, encoder);
369         encoder->possible_crtcs = (1 << unit);
370         encoder->possible_clones = 0;
371
372         drm_crtc_init(dev, crtc, &vmw_legacy_crtc_funcs);
373
374         drm_mode_crtc_set_gamma_size(crtc, 256);
375
376         drm_connector_attach_property(connector,
377                                       dev->mode_config.dirty_info_property,
378                                       1);
379
380         return 0;
381 }
382
383 int vmw_kms_init_legacy_display_system(struct vmw_private *dev_priv)
384 {
385         struct drm_device *dev = dev_priv->dev;
386         int i, ret;
387
388         if (dev_priv->ldu_priv) {
389                 DRM_INFO("ldu system already on\n");
390                 return -EINVAL;
391         }
392
393         dev_priv->ldu_priv = kmalloc(sizeof(*dev_priv->ldu_priv), GFP_KERNEL);
394         if (!dev_priv->ldu_priv)
395                 return -ENOMEM;
396
397         INIT_LIST_HEAD(&dev_priv->ldu_priv->active);
398         dev_priv->ldu_priv->num_active = 0;
399         dev_priv->ldu_priv->last_num_active = 0;
400         dev_priv->ldu_priv->fb = NULL;
401
402         /* for old hardware without multimon only enable one display */
403         if (dev_priv->capabilities & SVGA_CAP_MULTIMON)
404                 ret = drm_vblank_init(dev, VMWGFX_NUM_DISPLAY_UNITS);
405         else
406                 ret = drm_vblank_init(dev, 1);
407         if (ret != 0)
408                 goto err_free;
409
410         ret = drm_mode_create_dirty_info_property(dev);
411         if (ret != 0)
412                 goto err_vblank_cleanup;
413
414         if (dev_priv->capabilities & SVGA_CAP_MULTIMON)
415                 for (i = 0; i < VMWGFX_NUM_DISPLAY_UNITS; ++i)
416                         vmw_ldu_init(dev_priv, i);
417         else
418                 vmw_ldu_init(dev_priv, 0);
419
420         return 0;
421
422 err_vblank_cleanup:
423         drm_vblank_cleanup(dev);
424 err_free:
425         kfree(dev_priv->ldu_priv);
426         dev_priv->ldu_priv = NULL;
427         return ret;
428 }
429
430 int vmw_kms_close_legacy_display_system(struct vmw_private *dev_priv)
431 {
432         struct drm_device *dev = dev_priv->dev;
433
434         if (!dev_priv->ldu_priv)
435                 return -ENOSYS;
436
437         drm_vblank_cleanup(dev);
438
439         BUG_ON(!list_empty(&dev_priv->ldu_priv->active));
440
441         kfree(dev_priv->ldu_priv);
442
443         return 0;
444 }