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_blend.h> 8 #include <drm/drm_fourcc.h> 9 #include <drm/drm_gem_atomic_helper.h> 10 #include <drm/drm_gem_framebuffer_helper.h> 11 12 #include "vkms_drv.h" 13 #include "vkms_formats.h" 14 15 static const u32 vkms_formats[] = { 16 DRM_FORMAT_ARGB8888, 17 DRM_FORMAT_XRGB8888, 18 DRM_FORMAT_XRGB16161616, 19 DRM_FORMAT_ARGB16161616, 20 DRM_FORMAT_RGB565 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_frame_info *frame_info; 28 29 vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL); 30 if (!vkms_state) 31 return NULL; 32 33 frame_info = kzalloc(sizeof(*frame_info), GFP_KERNEL); 34 if (!frame_info) { 35 DRM_DEBUG_KMS("Couldn't allocate frame_info\n"); 36 kfree(vkms_state); 37 return NULL; 38 } 39 40 vkms_state->frame_info = frame_info; 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 && vkms_state->frame_info->fb) { 54 /* dropping the reference we acquired in 55 * vkms_primary_plane_update() 56 */ 57 if (drm_framebuffer_read_refcount(vkms_state->frame_info->fb)) 58 drm_framebuffer_put(vkms_state->frame_info->fb); 59 } 60 61 kfree(vkms_state->frame_info); 62 vkms_state->frame_info = 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_frame_info *frame_info; 103 u32 fmt; 104 105 if (!new_state->crtc || !fb) 106 return; 107 108 fmt = fb->format->format; 109 vkms_plane_state = to_vkms_plane_state(new_state); 110 shadow_plane_state = &vkms_plane_state->base; 111 112 frame_info = vkms_plane_state->frame_info; 113 memcpy(&frame_info->src, &new_state->src, sizeof(struct drm_rect)); 114 memcpy(&frame_info->dst, &new_state->dst, sizeof(struct drm_rect)); 115 frame_info->fb = fb; 116 memcpy(&frame_info->map, &shadow_plane_state->data, sizeof(frame_info->map)); 117 drm_framebuffer_get(frame_info->fb); 118 frame_info->rotation = new_state->rotation; 119 120 vkms_plane_state->pixel_read_line = get_pixel_read_line_function(fmt); 121 } 122 123 static int vkms_plane_atomic_check(struct drm_plane *plane, 124 struct drm_atomic_state *state) 125 { 126 struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, 127 plane); 128 struct drm_crtc_state *crtc_state; 129 int ret; 130 131 if (!new_plane_state->fb || WARN_ON(!new_plane_state->crtc)) 132 return 0; 133 134 crtc_state = drm_atomic_get_crtc_state(state, 135 new_plane_state->crtc); 136 if (IS_ERR(crtc_state)) 137 return PTR_ERR(crtc_state); 138 139 ret = drm_atomic_helper_check_plane_state(new_plane_state, crtc_state, 140 DRM_PLANE_NO_SCALING, 141 DRM_PLANE_NO_SCALING, 142 true, true); 143 if (ret != 0) 144 return ret; 145 146 return 0; 147 } 148 149 static int vkms_prepare_fb(struct drm_plane *plane, 150 struct drm_plane_state *state) 151 { 152 struct drm_shadow_plane_state *shadow_plane_state; 153 struct drm_framebuffer *fb = state->fb; 154 int ret; 155 156 if (!fb) 157 return 0; 158 159 shadow_plane_state = to_drm_shadow_plane_state(state); 160 161 ret = drm_gem_plane_helper_prepare_fb(plane, state); 162 if (ret) 163 return ret; 164 165 return drm_gem_fb_vmap(fb, shadow_plane_state->map, shadow_plane_state->data); 166 } 167 168 static void vkms_cleanup_fb(struct drm_plane *plane, 169 struct drm_plane_state *state) 170 { 171 struct drm_shadow_plane_state *shadow_plane_state; 172 struct drm_framebuffer *fb = state->fb; 173 174 if (!fb) 175 return; 176 177 shadow_plane_state = to_drm_shadow_plane_state(state); 178 179 drm_gem_fb_vunmap(fb, shadow_plane_state->map); 180 } 181 182 static const struct drm_plane_helper_funcs vkms_plane_helper_funcs = { 183 .atomic_update = vkms_plane_atomic_update, 184 .atomic_check = vkms_plane_atomic_check, 185 .prepare_fb = vkms_prepare_fb, 186 .cleanup_fb = vkms_cleanup_fb, 187 }; 188 189 struct vkms_plane *vkms_plane_init(struct vkms_device *vkmsdev, 190 enum drm_plane_type type) 191 { 192 struct drm_device *dev = &vkmsdev->drm; 193 struct vkms_plane *plane; 194 195 plane = drmm_universal_plane_alloc(dev, struct vkms_plane, base, 0, 196 &vkms_plane_funcs, 197 vkms_formats, ARRAY_SIZE(vkms_formats), 198 NULL, type, NULL); 199 if (IS_ERR(plane)) 200 return plane; 201 202 drm_plane_helper_add(&plane->base, &vkms_plane_helper_funcs); 203 204 drm_plane_create_rotation_property(&plane->base, DRM_MODE_ROTATE_0, 205 DRM_MODE_ROTATE_MASK | DRM_MODE_REFLECT_MASK); 206 207 return plane; 208 } 209