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1/*
2 * Copyright (C) 2014 Intel Corporation
3 *
4 * DRM universal plane helper functions
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26#include <linux/list.h>
27
28#include <drm/drm_atomic.h>
29#include <drm/drm_atomic_helper.h>
30#include <drm/drm_atomic_uapi.h>
31#include <drm/drm_crtc_helper.h>
32#include <drm/drm_device.h>
33#include <drm/drm_encoder.h>
34#include <drm/drm_plane_helper.h>
35#include <drm/drm_rect.h>
36
37#define SUBPIXEL_MASK 0xffff
38
39/**
40 * DOC: overview
41 *
42 * This helper library has two parts. The first part has support to implement
43 * primary plane support on top of the normal CRTC configuration interface.
44 * Since the legacy &drm_mode_config_funcs.set_config interface ties the primary
45 * plane together with the CRTC state this does not allow userspace to disable
46 * the primary plane itself. The default primary plane only expose XRBG8888 and
47 * ARGB8888 as valid pixel formats for the attached framebuffer.
48 *
49 * Drivers are highly recommended to implement proper support for primary
50 * planes, and newly merged drivers must not rely upon these transitional
51 * helpers.
52 *
53 * The second part also implements transitional helpers which allow drivers to
54 * gradually switch to the atomic helper infrastructure for plane updates. Once
55 * that switch is complete drivers shouldn't use these any longer, instead using
56 * the proper legacy implementations for update and disable plane hooks provided
57 * by the atomic helpers.
58 *
59 * Again drivers are strongly urged to switch to the new interfaces.
60 *
61 * The plane helpers share the function table structures with other helpers,
62 * specifically also the atomic helpers. See &struct drm_plane_helper_funcs for
63 * the details.
64 */
65
66/*
67 * Returns the connectors currently associated with a CRTC. This function
68 * should be called twice: once with a NULL connector list to retrieve
69 * the list size, and once with the properly allocated list to be filled in.
70 */
71static int get_connectors_for_crtc(struct drm_crtc *crtc,
72 struct drm_connector **connector_list,
73 int num_connectors)
74{
75 struct drm_device *dev = crtc->dev;
76 struct drm_connector *connector;
77 struct drm_connector_list_iter conn_iter;
78 int count = 0;
79
80 /*
81 * Note: Once we change the plane hooks to more fine-grained locking we
82 * need to grab the connection_mutex here to be able to make these
83 * checks.
84 */
85 WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
86
87 drm_connector_list_iter_begin(dev, &conn_iter);
88 drm_for_each_connector_iter(connector, &conn_iter) {
89 if (connector->encoder && connector->encoder->crtc == crtc) {
90 if (connector_list != NULL && count < num_connectors)
91 *(connector_list++) = connector;
92
93 count++;
94 }
95 }
96 drm_connector_list_iter_end(&conn_iter);
97
98 return count;
99}
100
101static int drm_plane_helper_check_update(struct drm_plane *plane,
102 struct drm_crtc *crtc,
103 struct drm_framebuffer *fb,
104 struct drm_rect *src,
105 struct drm_rect *dst,
106 unsigned int rotation,
107 int min_scale,
108 int max_scale,
109 bool can_position,
110 bool can_update_disabled,
111 bool *visible)
112{
113 struct drm_plane_state plane_state = {
114 .plane = plane,
115 .crtc = crtc,
116 .fb = fb,
117 .src_x = src->x1,
118 .src_y = src->y1,
119 .src_w = drm_rect_width(src),
120 .src_h = drm_rect_height(src),
121 .crtc_x = dst->x1,
122 .crtc_y = dst->y1,
123 .crtc_w = drm_rect_width(dst),
124 .crtc_h = drm_rect_height(dst),
125 .rotation = rotation,
126 .visible = *visible,
127 };
128 struct drm_crtc_state crtc_state = {
129 .crtc = crtc,
130 .enable = crtc->enabled,
131 .mode = crtc->mode,
132 };
133 int ret;
134
135 ret = drm_atomic_helper_check_plane_state(&plane_state, &crtc_state,
136 min_scale, max_scale,
137 can_position,
138 can_update_disabled);
139 if (ret)
140 return ret;
141
142 *src = plane_state.src;
143 *dst = plane_state.dst;
144 *visible = plane_state.visible;
145
146 return 0;
147}
148
149static int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
150 struct drm_framebuffer *fb,
151 int crtc_x, int crtc_y,
152 unsigned int crtc_w, unsigned int crtc_h,
153 uint32_t src_x, uint32_t src_y,
154 uint32_t src_w, uint32_t src_h,
155 struct drm_modeset_acquire_ctx *ctx)
156{
157 struct drm_mode_set set = {
158 .crtc = crtc,
159 .fb = fb,
160 .mode = &crtc->mode,
161 .x = src_x >> 16,
162 .y = src_y >> 16,
163 };
164 struct drm_rect src = {
165 .x1 = src_x,
166 .y1 = src_y,
167 .x2 = src_x + src_w,
168 .y2 = src_y + src_h,
169 };
170 struct drm_rect dest = {
171 .x1 = crtc_x,
172 .y1 = crtc_y,
173 .x2 = crtc_x + crtc_w,
174 .y2 = crtc_y + crtc_h,
175 };
176 struct drm_connector **connector_list;
177 int num_connectors, ret;
178 bool visible;
179
180 ret = drm_plane_helper_check_update(plane, crtc, fb,
181 &src, &dest,
182 DRM_MODE_ROTATE_0,
183 DRM_PLANE_HELPER_NO_SCALING,
184 DRM_PLANE_HELPER_NO_SCALING,
185 false, false, &visible);
186 if (ret)
187 return ret;
188
189 if (!visible)
190 /*
191 * Primary plane isn't visible. Note that unless a driver
192 * provides their own disable function, this will just
193 * wind up returning -EINVAL to userspace.
194 */
195 return plane->funcs->disable_plane(plane, ctx);
196
197 /* Find current connectors for CRTC */
198 num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
199 BUG_ON(num_connectors == 0);
200 connector_list = kcalloc(num_connectors, sizeof(*connector_list),
201 GFP_KERNEL);
202 if (!connector_list)
203 return -ENOMEM;
204 get_connectors_for_crtc(crtc, connector_list, num_connectors);
205
206 set.connectors = connector_list;
207 set.num_connectors = num_connectors;
208
209 /*
210 * We call set_config() directly here rather than using
211 * drm_mode_set_config_internal. We're reprogramming the same
212 * connectors that were already in use, so we shouldn't need the extra
213 * cross-CRTC fb refcounting to accomodate stealing connectors.
214 * drm_mode_setplane() already handles the basic refcounting for the
215 * framebuffers involved in this operation.
216 */
217 ret = crtc->funcs->set_config(&set, ctx);
218
219 kfree(connector_list);
220 return ret;
221}
222
223static int drm_primary_helper_disable(struct drm_plane *plane,
224 struct drm_modeset_acquire_ctx *ctx)
225{
226 return -EINVAL;
227}
228
229/**
230 * drm_primary_helper_destroy() - Helper for primary plane destruction
231 * @plane: plane to destroy
232 *
233 * Provides a default plane destroy handler for primary planes. This handler
234 * is called during CRTC destruction. We disable the primary plane, remove
235 * it from the DRM plane list, and deallocate the plane structure.
236 */
237void drm_primary_helper_destroy(struct drm_plane *plane)
238{
239 drm_plane_cleanup(plane);
240 kfree(plane);
241}
242EXPORT_SYMBOL(drm_primary_helper_destroy);
243
244const struct drm_plane_funcs drm_primary_helper_funcs = {
245 .update_plane = drm_primary_helper_update,
246 .disable_plane = drm_primary_helper_disable,
247 .destroy = drm_primary_helper_destroy,
248};
249EXPORT_SYMBOL(drm_primary_helper_funcs);
1/*
2 * Copyright (C) 2014 Intel Corporation
3 *
4 * DRM universal plane helper functions
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 */
25
26#include <linux/list.h>
27#include <drm/drmP.h>
28#include <drm/drm_rect.h>
29
30#define SUBPIXEL_MASK 0xffff
31
32/*
33 * This is the minimal list of formats that seem to be safe for modeset use
34 * with all current DRM drivers. Most hardware can actually support more
35 * formats than this and drivers may specify a more accurate list when
36 * creating the primary plane. However drivers that still call
37 * drm_plane_init() will use this minimal format list as the default.
38 */
39const static uint32_t safe_modeset_formats[] = {
40 DRM_FORMAT_XRGB8888,
41 DRM_FORMAT_ARGB8888,
42};
43
44/*
45 * Returns the connectors currently associated with a CRTC. This function
46 * should be called twice: once with a NULL connector list to retrieve
47 * the list size, and once with the properly allocated list to be filled in.
48 */
49static int get_connectors_for_crtc(struct drm_crtc *crtc,
50 struct drm_connector **connector_list,
51 int num_connectors)
52{
53 struct drm_device *dev = crtc->dev;
54 struct drm_connector *connector;
55 int count = 0;
56
57 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
58 if (connector->encoder && connector->encoder->crtc == crtc) {
59 if (connector_list != NULL && count < num_connectors)
60 *(connector_list++) = connector;
61
62 count++;
63 }
64
65 return count;
66}
67
68/**
69 * drm_primary_helper_update() - Helper for primary plane update
70 * @plane: plane object to update
71 * @crtc: owning CRTC of owning plane
72 * @fb: framebuffer to flip onto plane
73 * @crtc_x: x offset of primary plane on crtc
74 * @crtc_y: y offset of primary plane on crtc
75 * @crtc_w: width of primary plane rectangle on crtc
76 * @crtc_h: height of primary plane rectangle on crtc
77 * @src_x: x offset of @fb for panning
78 * @src_y: y offset of @fb for panning
79 * @src_w: width of source rectangle in @fb
80 * @src_h: height of source rectangle in @fb
81 *
82 * Provides a default plane update handler for primary planes. This is handler
83 * is called in response to a userspace SetPlane operation on the plane with a
84 * non-NULL framebuffer. We call the driver's modeset handler to update the
85 * framebuffer.
86 *
87 * SetPlane() on a primary plane of a disabled CRTC is not supported, and will
88 * return an error.
89 *
90 * Note that we make some assumptions about hardware limitations that may not be
91 * true for all hardware --
92 * 1) Primary plane cannot be repositioned.
93 * 2) Primary plane cannot be scaled.
94 * 3) Primary plane must cover the entire CRTC.
95 * 4) Subpixel positioning is not supported.
96 * Drivers for hardware that don't have these restrictions can provide their
97 * own implementation rather than using this helper.
98 *
99 * RETURNS:
100 * Zero on success, error code on failure
101 */
102int drm_primary_helper_update(struct drm_plane *plane, struct drm_crtc *crtc,
103 struct drm_framebuffer *fb,
104 int crtc_x, int crtc_y,
105 unsigned int crtc_w, unsigned int crtc_h,
106 uint32_t src_x, uint32_t src_y,
107 uint32_t src_w, uint32_t src_h)
108{
109 struct drm_mode_set set = {
110 .crtc = crtc,
111 .fb = fb,
112 .mode = &crtc->mode,
113 .x = src_x >> 16,
114 .y = src_y >> 16,
115 };
116 struct drm_rect dest = {
117 .x1 = crtc_x,
118 .y1 = crtc_y,
119 .x2 = crtc_x + crtc_w,
120 .y2 = crtc_y + crtc_h,
121 };
122 struct drm_rect clip = {
123 .x2 = crtc->mode.hdisplay,
124 .y2 = crtc->mode.vdisplay,
125 };
126 struct drm_connector **connector_list;
127 struct drm_framebuffer *tmpfb;
128 int num_connectors, ret;
129
130 if (!crtc->enabled) {
131 DRM_DEBUG_KMS("Cannot update primary plane of a disabled CRTC.\n");
132 return -EINVAL;
133 }
134
135 /* Disallow subpixel positioning */
136 if ((src_x | src_y | src_w | src_h) & SUBPIXEL_MASK) {
137 DRM_DEBUG_KMS("Primary plane does not support subpixel positioning\n");
138 return -EINVAL;
139 }
140
141 /* Primary planes are locked to their owning CRTC */
142 if (plane->possible_crtcs != drm_crtc_mask(crtc)) {
143 DRM_DEBUG_KMS("Cannot change primary plane CRTC\n");
144 return -EINVAL;
145 }
146
147 /* Disallow scaling */
148 if (crtc_w != src_w || crtc_h != src_h) {
149 DRM_DEBUG_KMS("Can't scale primary plane\n");
150 return -EINVAL;
151 }
152
153 /* Make sure primary plane covers entire CRTC */
154 drm_rect_intersect(&dest, &clip);
155 if (dest.x1 != 0 || dest.y1 != 0 ||
156 dest.x2 != crtc->mode.hdisplay || dest.y2 != crtc->mode.vdisplay) {
157 DRM_DEBUG_KMS("Primary plane must cover entire CRTC\n");
158 return -EINVAL;
159 }
160
161 /* Framebuffer must be big enough to cover entire plane */
162 ret = drm_crtc_check_viewport(crtc, crtc_x, crtc_y, &crtc->mode, fb);
163 if (ret)
164 return ret;
165
166 /* Find current connectors for CRTC */
167 num_connectors = get_connectors_for_crtc(crtc, NULL, 0);
168 BUG_ON(num_connectors == 0);
169 connector_list = kzalloc(num_connectors * sizeof(*connector_list),
170 GFP_KERNEL);
171 if (!connector_list)
172 return -ENOMEM;
173 get_connectors_for_crtc(crtc, connector_list, num_connectors);
174
175 set.connectors = connector_list;
176 set.num_connectors = num_connectors;
177
178 /*
179 * set_config() adjusts crtc->primary->fb; however the DRM setplane
180 * code that called us expects to handle the framebuffer update and
181 * reference counting; save and restore the current fb before
182 * calling it.
183 *
184 * N.B., we call set_config() directly here rather than using
185 * drm_mode_set_config_internal. We're reprogramming the same
186 * connectors that were already in use, so we shouldn't need the extra
187 * cross-CRTC fb refcounting to accomodate stealing connectors.
188 * drm_mode_setplane() already handles the basic refcounting for the
189 * framebuffers involved in this operation.
190 */
191 tmpfb = plane->fb;
192 ret = crtc->funcs->set_config(&set);
193 plane->fb = tmpfb;
194
195 kfree(connector_list);
196 return ret;
197}
198EXPORT_SYMBOL(drm_primary_helper_update);
199
200/**
201 * drm_primary_helper_disable() - Helper for primary plane disable
202 * @plane: plane to disable
203 *
204 * Provides a default plane disable handler for primary planes. This is handler
205 * is called in response to a userspace SetPlane operation on the plane with a
206 * NULL framebuffer parameter. It unconditionally fails the disable call with
207 * -EINVAL the only way to disable the primary plane without driver support is
208 * to disable the entier CRTC. Which does not match the plane ->disable hook.
209 *
210 * Note that some hardware may be able to disable the primary plane without
211 * disabling the whole CRTC. Drivers for such hardware should provide their
212 * own disable handler that disables just the primary plane (and they'll likely
213 * need to provide their own update handler as well to properly re-enable a
214 * disabled primary plane).
215 *
216 * RETURNS:
217 * Unconditionally returns -EINVAL.
218 */
219int drm_primary_helper_disable(struct drm_plane *plane)
220{
221 return -EINVAL;
222}
223EXPORT_SYMBOL(drm_primary_helper_disable);
224
225/**
226 * drm_primary_helper_destroy() - Helper for primary plane destruction
227 * @plane: plane to destroy
228 *
229 * Provides a default plane destroy handler for primary planes. This handler
230 * is called during CRTC destruction. We disable the primary plane, remove
231 * it from the DRM plane list, and deallocate the plane structure.
232 */
233void drm_primary_helper_destroy(struct drm_plane *plane)
234{
235 plane->funcs->disable_plane(plane);
236 drm_plane_cleanup(plane);
237 kfree(plane);
238}
239EXPORT_SYMBOL(drm_primary_helper_destroy);
240
241const struct drm_plane_funcs drm_primary_helper_funcs = {
242 .update_plane = drm_primary_helper_update,
243 .disable_plane = drm_primary_helper_disable,
244 .destroy = drm_primary_helper_destroy,
245};
246EXPORT_SYMBOL(drm_primary_helper_funcs);
247
248/**
249 * drm_primary_helper_create_plane() - Create a generic primary plane
250 * @dev: drm device
251 * @formats: pixel formats supported, or NULL for a default safe list
252 * @num_formats: size of @formats; ignored if @formats is NULL
253 *
254 * Allocates and initializes a primary plane that can be used with the primary
255 * plane helpers. Drivers that wish to use driver-specific plane structures or
256 * provide custom handler functions may perform their own allocation and
257 * initialization rather than calling this function.
258 */
259struct drm_plane *drm_primary_helper_create_plane(struct drm_device *dev,
260 const uint32_t *formats,
261 int num_formats)
262{
263 struct drm_plane *primary;
264 int ret;
265
266 primary = kzalloc(sizeof(*primary), GFP_KERNEL);
267 if (primary == NULL) {
268 DRM_DEBUG_KMS("Failed to allocate primary plane\n");
269 return NULL;
270 }
271
272 if (formats == NULL) {
273 formats = safe_modeset_formats;
274 num_formats = ARRAY_SIZE(safe_modeset_formats);
275 }
276
277 /* possible_crtc's will be filled in later by crtc_init */
278 ret = drm_plane_init(dev, primary, 0, &drm_primary_helper_funcs,
279 formats, num_formats,
280 DRM_PLANE_TYPE_PRIMARY);
281 if (ret) {
282 kfree(primary);
283 primary = NULL;
284 }
285
286 return primary;
287}
288EXPORT_SYMBOL(drm_primary_helper_create_plane);
289
290/**
291 * drm_crtc_init - Legacy CRTC initialization function
292 * @dev: DRM device
293 * @crtc: CRTC object to init
294 * @funcs: callbacks for the new CRTC
295 *
296 * Initialize a CRTC object with a default helper-provided primary plane and no
297 * cursor plane.
298 *
299 * Returns:
300 * Zero on success, error code on failure.
301 */
302int drm_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
303 const struct drm_crtc_funcs *funcs)
304{
305 struct drm_plane *primary;
306
307 primary = drm_primary_helper_create_plane(dev, NULL, 0);
308 return drm_crtc_init_with_planes(dev, crtc, primary, NULL, funcs);
309}
310EXPORT_SYMBOL(drm_crtc_init);