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_edid.h> 7 #include <drm/drm_fourcc.h> 8 #include <drm/drm_writeback.h> 9 #include <drm/drm_probe_helper.h> 10 #include <drm/drm_atomic_helper.h> 11 #include <drm/drm_gem_framebuffer_helper.h> 12 #include <drm/drm_gem_shmem_helper.h> 13 14 #include "vkms_drv.h" 15 #include "vkms_formats.h" 16 17 static const u32 vkms_wb_formats[] = { 18 DRM_FORMAT_ARGB8888, 19 DRM_FORMAT_XRGB8888, 20 DRM_FORMAT_XRGB16161616, 21 DRM_FORMAT_ARGB16161616, 22 DRM_FORMAT_RGB565 23 }; 24 25 static const struct drm_connector_funcs vkms_wb_connector_funcs = { 26 .fill_modes = drm_helper_probe_single_connector_modes, 27 .reset = drm_atomic_helper_connector_reset, 28 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 29 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 30 }; 31 32 static int vkms_wb_atomic_check(struct drm_connector *connector, 33 struct drm_atomic_state *state) 34 { 35 struct drm_connector_state *conn_state = 36 drm_atomic_get_new_connector_state(state, connector); 37 struct drm_crtc_state *crtc_state; 38 struct drm_framebuffer *fb; 39 const struct drm_display_mode *mode; 40 int ret; 41 42 if (!conn_state->writeback_job || !conn_state->writeback_job->fb) 43 return 0; 44 45 if (!conn_state->crtc) 46 return 0; 47 48 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc); 49 mode = &crtc_state->mode; 50 51 fb = conn_state->writeback_job->fb; 52 if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) { 53 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n", 54 fb->width, fb->height); 55 return -EINVAL; 56 } 57 58 ret = drm_atomic_helper_check_wb_connector_state(connector, state); 59 if (ret < 0) 60 return ret; 61 62 return 0; 63 } 64 65 static int vkms_wb_connector_get_modes(struct drm_connector *connector) 66 { 67 struct drm_device *dev = connector->dev; 68 69 return drm_add_modes_noedid(connector, dev->mode_config.max_width, 70 dev->mode_config.max_height); 71 } 72 73 static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector, 74 struct drm_writeback_job *job) 75 { 76 struct vkms_writeback_job *vkmsjob; 77 int ret; 78 79 if (!job->fb) 80 return 0; 81 82 vkmsjob = kzalloc(sizeof(*vkmsjob), GFP_KERNEL); 83 if (!vkmsjob) 84 return -ENOMEM; 85 86 ret = drm_gem_fb_vmap(job->fb, vkmsjob->wb_frame_info.map, vkmsjob->data); 87 if (ret) { 88 DRM_ERROR("vmap failed: %d\n", ret); 89 goto err_kfree; 90 } 91 92 vkmsjob->wb_frame_info.fb = job->fb; 93 drm_framebuffer_get(vkmsjob->wb_frame_info.fb); 94 95 job->priv = vkmsjob; 96 97 return 0; 98 99 err_kfree: 100 kfree(vkmsjob); 101 return ret; 102 } 103 104 static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector, 105 struct drm_writeback_job *job) 106 { 107 struct vkms_writeback_job *vkmsjob = job->priv; 108 struct vkms_output *vkms_output = container_of(connector, 109 struct vkms_output, 110 wb_connector); 111 112 if (!job->fb) 113 return; 114 115 drm_gem_fb_vunmap(job->fb, vkmsjob->wb_frame_info.map); 116 117 drm_framebuffer_put(vkmsjob->wb_frame_info.fb); 118 119 vkms_set_composer(vkms_output, false); 120 kfree(vkmsjob); 121 } 122 123 static void vkms_wb_atomic_commit(struct drm_connector *conn, 124 struct drm_atomic_state *state) 125 { 126 struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state, 127 conn); 128 struct vkms_output *output = drm_crtc_to_vkms_output(connector_state->crtc); 129 struct drm_writeback_connector *wb_conn = &output->wb_connector; 130 struct drm_connector_state *conn_state = wb_conn->base.state; 131 struct vkms_crtc_state *crtc_state = output->composer_state; 132 struct drm_framebuffer *fb = connector_state->writeback_job->fb; 133 u16 crtc_height = crtc_state->base.mode.vdisplay; 134 u16 crtc_width = crtc_state->base.mode.hdisplay; 135 struct vkms_writeback_job *active_wb; 136 struct vkms_frame_info *wb_frame_info; 137 u32 wb_format = fb->format->format; 138 139 if (!conn_state) 140 return; 141 142 vkms_set_composer(output, true); 143 144 active_wb = conn_state->writeback_job->priv; 145 wb_frame_info = &active_wb->wb_frame_info; 146 147 spin_lock_irq(&output->composer_lock); 148 crtc_state->active_writeback = active_wb; 149 crtc_state->wb_pending = true; 150 spin_unlock_irq(&output->composer_lock); 151 drm_writeback_queue_job(wb_conn, connector_state); 152 active_wb->pixel_write = get_pixel_write_function(wb_format); 153 drm_rect_init(&wb_frame_info->src, 0, 0, crtc_width, crtc_height); 154 drm_rect_init(&wb_frame_info->dst, 0, 0, crtc_width, crtc_height); 155 } 156 157 static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = { 158 .get_modes = vkms_wb_connector_get_modes, 159 .prepare_writeback_job = vkms_wb_prepare_job, 160 .cleanup_writeback_job = vkms_wb_cleanup_job, 161 .atomic_commit = vkms_wb_atomic_commit, 162 .atomic_check = vkms_wb_atomic_check, 163 }; 164 165 int vkms_enable_writeback_connector(struct vkms_device *vkmsdev, 166 struct vkms_output *vkms_output) 167 { 168 struct drm_writeback_connector *wb = &vkms_output->wb_connector; 169 int ret; 170 171 ret = drmm_encoder_init(&vkmsdev->drm, &vkms_output->wb_encoder, 172 NULL, DRM_MODE_ENCODER_VIRTUAL, NULL); 173 if (ret) 174 return ret; 175 vkms_output->wb_encoder.possible_crtcs |= drm_crtc_mask(&vkms_output->crtc); 176 177 drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs); 178 179 return drmm_writeback_connector_init(&vkmsdev->drm, wb, 180 &vkms_wb_connector_funcs, 181 &vkms_output->wb_encoder, 182 vkms_wb_formats, 183 ARRAY_SIZE(vkms_wb_formats)); 184 } 185