1 // SPDX-License-Identifier: GPL-2.0+ 2 3 #include <drm/drm_atomic.h> 4 #include <drm/drm_atomic_helper.h> 5 #include <drm/drm_fourcc.h> 6 #include <drm/drm_gem_framebuffer_helper.h> 7 #include <drm/drm_plane_helper.h> 8 9 #include "vkms_drv.h" 10 11 static const u32 vkms_formats[] = { 12 DRM_FORMAT_XRGB8888, 13 }; 14 15 static const u32 vkms_cursor_formats[] = { 16 DRM_FORMAT_ARGB8888, 17 }; 18 19 static struct drm_plane_state * 20 vkms_plane_duplicate_state(struct drm_plane *plane) 21 { 22 struct vkms_plane_state *vkms_state; 23 struct vkms_composer *composer; 24 25 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 26 if (!vkms_state) 27 return NULL; 28 29 composer = kzalloc(sizeof(*composer), GFP_KERNEL); 30 if (!composer) { 31 DRM_DEBUG_KMS("Couldn't allocate composer\n"); 32 kfree(vkms_state); 33 return NULL; 34 } 35 36 vkms_state->composer = composer; 37 38 __drm_atomic_helper_plane_duplicate_state(plane, 39 &vkms_state->base); 40 41 return &vkms_state->base; 42 } 43 44 static void vkms_plane_destroy_state(struct drm_plane *plane, 45 struct drm_plane_state *old_state) 46 { 47 struct vkms_plane_state *vkms_state = to_vkms_plane_state(old_state); 48 struct drm_crtc *crtc = vkms_state->base.crtc; 49 50 if (crtc) { 51 /* dropping the reference we acquired in 52 * vkms_primary_plane_update() 53 */ 54 if (drm_framebuffer_read_refcount(&vkms_state->composer->fb)) 55 drm_framebuffer_put(&vkms_state->composer->fb); 56 } 57 58 kfree(vkms_state->composer); 59 vkms_state->composer = NULL; 60 61 __drm_atomic_helper_plane_destroy_state(old_state); 62 kfree(vkms_state); 63 } 64 65 static void vkms_plane_reset(struct drm_plane *plane) 66 { 67 struct vkms_plane_state *vkms_state; 68 69 if (plane->state) 70 vkms_plane_destroy_state(plane, plane->state); 71 72 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 73 if (!vkms_state) { 74 DRM_ERROR("Cannot allocate vkms_plane_state\n"); 75 return; 76 } 77 78 plane->state = &vkms_state->base; 79 plane->state->plane = plane; 80 } 81 82 static const struct drm_plane_funcs vkms_plane_funcs = { 83 .update_plane = drm_atomic_helper_update_plane, 84 .disable_plane = drm_atomic_helper_disable_plane, 85 .destroy = drm_plane_cleanup, 86 .reset = vkms_plane_reset, 87 .atomic_duplicate_state = vkms_plane_duplicate_state, 88 .atomic_destroy_state = vkms_plane_destroy_state, 89 }; 90 91 static void vkms_plane_atomic_update(struct drm_plane *plane, 92 struct drm_plane_state *old_state) 93 { 94 struct vkms_plane_state *vkms_plane_state; 95 struct drm_framebuffer *fb = plane->state->fb; 96 struct vkms_composer *composer; 97 98 if (!plane->state->crtc || !fb) 99 return; 100 101 vkms_plane_state = to_vkms_plane_state(plane->state); 102 103 composer = vkms_plane_state->composer; 104 memcpy(&composer->src, &plane->state->src, sizeof(struct drm_rect)); 105 memcpy(&composer->dst, &plane->state->dst, sizeof(struct drm_rect)); 106 memcpy(&composer->fb, fb, sizeof(struct drm_framebuffer)); 107 drm_framebuffer_get(&composer->fb); 108 composer->offset = fb->offsets[0]; 109 composer->pitch = fb->pitches[0]; 110 composer->cpp = fb->format->cpp[0]; 111 } 112 113 static int vkms_plane_atomic_check(struct drm_plane *plane, 114 struct drm_plane_state *state) 115 { 116 struct drm_crtc_state *crtc_state; 117 bool can_position = false; 118 int ret; 119 120 if (!state->fb | !state->crtc) 121 return 0; 122 123 crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc); 124 if (IS_ERR(crtc_state)) 125 return PTR_ERR(crtc_state); 126 127 if (plane->type == DRM_PLANE_TYPE_CURSOR) 128 can_position = true; 129 130 ret = drm_atomic_helper_check_plane_state(state, crtc_state, 131 DRM_PLANE_HELPER_NO_SCALING, 132 DRM_PLANE_HELPER_NO_SCALING, 133 can_position, true); 134 if (ret != 0) 135 return ret; 136 137 /* for now primary plane must be visible and full screen */ 138 if (!state->visible && !can_position) 139 return -EINVAL; 140 141 return 0; 142 } 143 144 static int vkms_prepare_fb(struct drm_plane *plane, 145 struct drm_plane_state *state) 146 { 147 struct drm_gem_object *gem_obj; 148 int ret; 149 150 if (!state->fb) 151 return 0; 152 153 gem_obj = drm_gem_fb_get_obj(state->fb, 0); 154 ret = vkms_gem_vmap(gem_obj); 155 if (ret) 156 DRM_ERROR("vmap failed: %d\n", ret); 157 158 return drm_gem_fb_prepare_fb(plane, state); 159 } 160 161 static void vkms_cleanup_fb(struct drm_plane *plane, 162 struct drm_plane_state *old_state) 163 { 164 struct drm_gem_object *gem_obj; 165 166 if (!old_state->fb) 167 return; 168 169 gem_obj = drm_gem_fb_get_obj(old_state->fb, 0); 170 vkms_gem_vunmap(gem_obj); 171 } 172 173 static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = { 174 .atomic_update = vkms_plane_atomic_update, 175 .atomic_check = vkms_plane_atomic_check, 176 .prepare_fb = vkms_prepare_fb, 177 .cleanup_fb = vkms_cleanup_fb, 178 }; 179 180 struct drm_plane *vkms_plane_init(struct vkms_device *vkmsdev, 181 enum drm_plane_type type, int index) 182 { 183 struct drm_device *dev = &vkmsdev->drm; 184 const struct drm_plane_helper_funcs *funcs; 185 struct drm_plane *plane; 186 const u32 *formats; 187 int ret, nformats; 188 189 plane = kzalloc(sizeof(*plane), GFP_KERNEL); 190 if (!plane) 191 return ERR_PTR(-ENOMEM); 192 193 if (type == DRM_PLANE_TYPE_CURSOR) { 194 formats = vkms_cursor_formats; 195 nformats = ARRAY_SIZE(vkms_cursor_formats); 196 funcs = &vkms_primary_helper_funcs; 197 } else { 198 formats = vkms_formats; 199 nformats = ARRAY_SIZE(vkms_formats); 200 funcs = &vkms_primary_helper_funcs; 201 } 202 203 ret = drm_universal_plane_init(dev, plane, 1 << index, 204 &vkms_plane_funcs, 205 formats, nformats, 206 NULL, type, NULL); 207 if (ret) { 208 kfree(plane); 209 return ERR_PTR(ret); 210 } 211 212 drm_plane_helper_add(plane, funcs); 213 214 return plane; 215 } 216