1 // SPDX-License-Identifier: GPL-2.0+ 2 3 #include <linux/dma-buf-map.h> 4 5 #include <drm/drm_fourcc.h> 6 #include <drm/drm_writeback.h> 7 #include <drm/drm_probe_helper.h> 8 #include <drm/drm_atomic_helper.h> 9 #include <drm/drm_gem_framebuffer_helper.h> 10 #include <drm/drm_gem_shmem_helper.h> 11 12 #include "vkms_drv.h" 13 14 static const u32 vkms_wb_formats[] = { 15 DRM_FORMAT_XRGB8888, 16 }; 17 18 static const struct drm_connector_funcs vkms_wb_connector_funcs = { 19 .fill_modes = drm_helper_probe_single_connector_modes, 20 .destroy = drm_connector_cleanup, 21 .reset = drm_atomic_helper_connector_reset, 22 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 23 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 24 }; 25 26 static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder, 27 struct drm_crtc_state *crtc_state, 28 struct drm_connector_state *conn_state) 29 { 30 struct drm_framebuffer *fb; 31 const struct drm_display_mode *mode = &crtc_state->mode; 32 33 if (!conn_state->writeback_job || !conn_state->writeback_job->fb) 34 return 0; 35 36 fb = conn_state->writeback_job->fb; 37 if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) { 38 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n", 39 fb->width, fb->height); 40 return -EINVAL; 41 } 42 43 if (fb->format->format != vkms_wb_formats[0]) { 44 struct drm_format_name_buf format_name; 45 46 DRM_DEBUG_KMS("Invalid pixel format %s\n", 47 drm_get_format_name(fb->format->format, 48 &format_name)); 49 return -EINVAL; 50 } 51 52 return 0; 53 } 54 55 static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = { 56 .atomic_check = vkms_wb_encoder_atomic_check, 57 }; 58 59 static int vkms_wb_connector_get_modes(struct drm_connector *connector) 60 { 61 struct drm_device *dev = connector->dev; 62 63 return drm_add_modes_noedid(connector, dev->mode_config.max_width, 64 dev->mode_config.max_height); 65 } 66 67 static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector, 68 struct drm_writeback_job *job) 69 { 70 struct drm_gem_object *gem_obj; 71 struct dma_buf_map map; 72 int ret; 73 74 if (!job->fb) 75 return 0; 76 77 gem_obj = drm_gem_fb_get_obj(job->fb, 0); 78 ret = drm_gem_shmem_vmap(gem_obj, &map); 79 if (ret) { 80 DRM_ERROR("vmap failed: %d\n", ret); 81 return ret; 82 } 83 84 job->priv = map.vaddr; 85 86 return 0; 87 } 88 89 static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector, 90 struct drm_writeback_job *job) 91 { 92 struct drm_gem_object *gem_obj; 93 struct vkms_device *vkmsdev; 94 struct dma_buf_map map; 95 96 if (!job->fb) 97 return; 98 99 gem_obj = drm_gem_fb_get_obj(job->fb, 0); 100 dma_buf_map_set_vaddr(&map, job->priv); 101 drm_gem_shmem_vunmap(gem_obj, &map); 102 103 vkmsdev = drm_device_to_vkms_device(gem_obj->dev); 104 vkms_set_composer(&vkmsdev->output, false); 105 } 106 107 static void vkms_wb_atomic_commit(struct drm_connector *conn, 108 struct drm_connector_state *state) 109 { 110 struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev); 111 struct vkms_output *output = &vkmsdev->output; 112 struct drm_writeback_connector *wb_conn = &output->wb_connector; 113 struct drm_connector_state *conn_state = wb_conn->base.state; 114 struct vkms_crtc_state *crtc_state = output->composer_state; 115 116 if (!conn_state) 117 return; 118 119 vkms_set_composer(&vkmsdev->output, true); 120 121 spin_lock_irq(&output->composer_lock); 122 crtc_state->active_writeback = conn_state->writeback_job->priv; 123 crtc_state->wb_pending = true; 124 spin_unlock_irq(&output->composer_lock); 125 drm_writeback_queue_job(wb_conn, state); 126 } 127 128 static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = { 129 .get_modes = vkms_wb_connector_get_modes, 130 .prepare_writeback_job = vkms_wb_prepare_job, 131 .cleanup_writeback_job = vkms_wb_cleanup_job, 132 .atomic_commit = vkms_wb_atomic_commit, 133 }; 134 135 int vkms_enable_writeback_connector(struct vkms_device *vkmsdev) 136 { 137 struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector; 138 139 vkmsdev->output.wb_connector.encoder.possible_crtcs = 1; 140 drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs); 141 142 return drm_writeback_connector_init(&vkmsdev->drm, wb, 143 &vkms_wb_connector_funcs, 144 &vkms_wb_encoder_helper_funcs, 145 vkms_wb_formats, 146 ARRAY_SIZE(vkms_wb_formats)); 147 } 148