]> Git Repo - linux.git/blob - drivers/gpu/drm/vkms/vkms_plane.c
Merge tag 'cxl-for-6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
[linux.git] / drivers / gpu / drm / vkms / vkms_plane.c
1 // SPDX-License-Identifier: GPL-2.0+
2
3 #include <linux/iosys-map.h>
4
5 #include <drm/drm_atomic.h>
6 #include <drm/drm_atomic_helper.h>
7 #include <drm/drm_fourcc.h>
8 #include <drm/drm_gem_atomic_helper.h>
9 #include <drm/drm_gem_framebuffer_helper.h>
10 #include <drm/drm_plane_helper.h>
11
12 #include "vkms_drv.h"
13
14 static const u32 vkms_formats[] = {
15         DRM_FORMAT_XRGB8888,
16 };
17
18 static const u32 vkms_plane_formats[] = {
19         DRM_FORMAT_ARGB8888,
20         DRM_FORMAT_XRGB8888
21 };
22
23 static struct drm_plane_state *
24 vkms_plane_duplicate_state(struct drm_plane *plane)
25 {
26         struct vkms_plane_state *vkms_state;
27         struct vkms_composer *composer;
28
29         vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
30         if (!vkms_state)
31                 return NULL;
32
33         composer = kzalloc(sizeof(*composer), GFP_KERNEL);
34         if (!composer) {
35                 DRM_DEBUG_KMS("Couldn't allocate composer\n");
36                 kfree(vkms_state);
37                 return NULL;
38         }
39
40         vkms_state->composer = composer;
41
42         __drm_gem_duplicate_shadow_plane_state(plane, &vkms_state->base);
43
44         return &vkms_state->base.base;
45 }
46
47 static void vkms_plane_destroy_state(struct drm_plane *plane,
48                                      struct drm_plane_state *old_state)
49 {
50         struct vkms_plane_state *vkms_state = to_vkms_plane_state(old_state);
51         struct drm_crtc *crtc = vkms_state->base.base.crtc;
52
53         if (crtc) {
54                 /* dropping the reference we acquired in
55                  * vkms_primary_plane_update()
56                  */
57                 if (drm_framebuffer_read_refcount(&vkms_state->composer->fb))
58                         drm_framebuffer_put(&vkms_state->composer->fb);
59         }
60
61         kfree(vkms_state->composer);
62         vkms_state->composer = NULL;
63
64         __drm_gem_destroy_shadow_plane_state(&vkms_state->base);
65         kfree(vkms_state);
66 }
67
68 static void vkms_plane_reset(struct drm_plane *plane)
69 {
70         struct vkms_plane_state *vkms_state;
71
72         if (plane->state) {
73                 vkms_plane_destroy_state(plane, plane->state);
74                 plane->state = NULL; /* must be set to NULL here */
75         }
76
77         vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
78         if (!vkms_state) {
79                 DRM_ERROR("Cannot allocate vkms_plane_state\n");
80                 return;
81         }
82
83         __drm_gem_reset_shadow_plane(plane, &vkms_state->base);
84 }
85
86 static const struct drm_plane_funcs vkms_plane_funcs = {
87         .update_plane           = drm_atomic_helper_update_plane,
88         .disable_plane          = drm_atomic_helper_disable_plane,
89         .reset                  = vkms_plane_reset,
90         .atomic_duplicate_state = vkms_plane_duplicate_state,
91         .atomic_destroy_state   = vkms_plane_destroy_state,
92 };
93
94 static void vkms_plane_atomic_update(struct drm_plane *plane,
95                                      struct drm_atomic_state *state)
96 {
97         struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
98                                                                            plane);
99         struct vkms_plane_state *vkms_plane_state;
100         struct drm_shadow_plane_state *shadow_plane_state;
101         struct drm_framebuffer *fb = new_state->fb;
102         struct vkms_composer *composer;
103
104         if (!new_state->crtc || !fb)
105                 return;
106
107         vkms_plane_state = to_vkms_plane_state(new_state);
108         shadow_plane_state = &vkms_plane_state->base;
109
110         composer = vkms_plane_state->composer;
111         memcpy(&composer->src, &new_state->src, sizeof(struct drm_rect));
112         memcpy(&composer->dst, &new_state->dst, sizeof(struct drm_rect));
113         memcpy(&composer->fb, fb, sizeof(struct drm_framebuffer));
114         memcpy(&composer->map, &shadow_plane_state->data, sizeof(composer->map));
115         drm_framebuffer_get(&composer->fb);
116         composer->offset = fb->offsets[0];
117         composer->pitch = fb->pitches[0];
118         composer->cpp = fb->format->cpp[0];
119 }
120
121 static int vkms_plane_atomic_check(struct drm_plane *plane,
122                                    struct drm_atomic_state *state)
123 {
124         struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
125                                                                                  plane);
126         struct drm_crtc_state *crtc_state;
127         bool can_position = false;
128         int ret;
129
130         if (!new_plane_state->fb || WARN_ON(!new_plane_state->crtc))
131                 return 0;
132
133         crtc_state = drm_atomic_get_crtc_state(state,
134                                                new_plane_state->crtc);
135         if (IS_ERR(crtc_state))
136                 return PTR_ERR(crtc_state);
137
138         if (plane->type != DRM_PLANE_TYPE_PRIMARY)
139                 can_position = true;
140
141         ret = drm_atomic_helper_check_plane_state(new_plane_state, crtc_state,
142                                                   DRM_PLANE_HELPER_NO_SCALING,
143                                                   DRM_PLANE_HELPER_NO_SCALING,
144                                                   can_position, true);
145         if (ret != 0)
146                 return ret;
147
148         /* for now primary plane must be visible and full screen */
149         if (!new_plane_state->visible && !can_position)
150                 return -EINVAL;
151
152         return 0;
153 }
154
155 static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = {
156         .atomic_update          = vkms_plane_atomic_update,
157         .atomic_check           = vkms_plane_atomic_check,
158         DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
159 };
160
161 struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev,
162                                    enum drm_plane_type type, int index)
163 {
164         struct drm_device *dev = &vkmsdev->drm;
165         const struct drm_plane_helper_funcs *funcs;
166         struct vkms_plane *plane;
167         const u32 *formats;
168         int nformats;
169
170         switch (type) {
171         case DRM_PLANE_TYPE_PRIMARY:
172                 formats = vkms_formats;
173                 nformats = ARRAY_SIZE(vkms_formats);
174                 funcs = &vkms_primary_helper_funcs;
175                 break;
176         case DRM_PLANE_TYPE_CURSOR:
177         case DRM_PLANE_TYPE_OVERLAY:
178                 formats = vkms_plane_formats;
179                 nformats = ARRAY_SIZE(vkms_plane_formats);
180                 funcs = &vkms_primary_helper_funcs;
181                 break;
182         default:
183                 formats = vkms_formats;
184                 nformats = ARRAY_SIZE(vkms_formats);
185                 funcs = &vkms_primary_helper_funcs;
186                 break;
187         }
188
189         plane = drmm_universal_plane_alloc(dev, struct vkms_plane, base, 1 << index,
190                                            &vkms_plane_funcs,
191                                            formats, nformats,
192                                            NULL, type, NULL);
193         if (IS_ERR(plane))
194                 return plane;
195
196         drm_plane_helper_add(&plane->base, funcs);
197
198         return plane;
199 }
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