drm/vkms/vkms_writeback.c

0001 // SPDX-License-Identifier: GPL-2.0+
0002
0003 #include <linux/iosys-map.h>
0004
0005 #include <drm/drm_atomic.h>
0006 #include <drm/drm_edid.h>
0007 #include <drm/drm_fourcc.h>
0008 #include <drm/drm_writeback.h>
0009 #include <drm/drm_probe_helper.h>
0010 #include <drm/drm_atomic_helper.h>
0011 #include <drm/drm_gem_framebuffer_helper.h>
0012 #include <drm/drm_gem_shmem_helper.h>
0013
0014 #include "vkms_drv.h"
0015
0016 static const u32 vkms_wb_formats[] = {
0017     DRM_FORMAT_XRGB8888,
0018 };
0019
0020 static const struct drm_connector_funcs vkms_wb_connector_funcs = {
0021     .fill_modes = drm_helper_probe_single_connector_modes,
0022     .destroy = drm_connector_cleanup,
0023     .reset = drm_atomic_helper_connector_reset,
0024     .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
0025     .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
0026 };
0027
0028 static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
0029                     struct drm_crtc_state *crtc_state,
0030                     struct drm_connector_state *conn_state)
0031 {
0032     struct drm_framebuffer *fb;
0033     const struct drm_display_mode *mode = &crtc_state->mode;
0034
0035     if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
0036         return 0;
0037
0038     fb = conn_state->writeback_job->fb;
0039     if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
0040         DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
0041                   fb->width, fb->height);
0042         return -EINVAL;
0043     }
0044
0045     if (fb->format->format != vkms_wb_formats[0]) {
0046         DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
0047                   &fb->format->format);
0048         return -EINVAL;
0049     }
0050
0051     return 0;
0052 }
0053
0054 static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = {
0055     .atomic_check = vkms_wb_encoder_atomic_check,
0056 };
0057
0058 static int vkms_wb_connector_get_modes(struct drm_connector *connector)
0059 {
0060     struct drm_device *dev = connector->dev;
0061
0062     return drm_add_modes_noedid(connector, dev->mode_config.max_width,
0063                     dev->mode_config.max_height);
0064 }
0065
0066 static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
0067                    struct drm_writeback_job *job)
0068 {
0069     struct vkms_writeback_job *vkmsjob;
0070     int ret;
0071
0072     if (!job->fb)
0073         return 0;
0074
0075     vkmsjob = kzalloc(sizeof(*vkmsjob), GFP_KERNEL);
0076     if (!vkmsjob)
0077         return -ENOMEM;
0078
0079     ret = drm_gem_fb_vmap(job->fb, vkmsjob->map, vkmsjob->data);
0080     if (ret) {
0081         DRM_ERROR("vmap failed: %d\n", ret);
0082         goto err_kfree;
0083     }
0084
0085     job->priv = vkmsjob;
0086
0087     return 0;
0088
0089 err_kfree:
0090     kfree(vkmsjob);
0091     return ret;
0092 }
0093
0094 static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
0095                 struct drm_writeback_job *job)
0096 {
0097     struct vkms_writeback_job *vkmsjob = job->priv;
0098     struct vkms_device *vkmsdev;
0099
0100     if (!job->fb)
0101         return;
0102
0103     drm_gem_fb_vunmap(job->fb, vkmsjob->map);
0104
0105     vkmsdev = drm_device_to_vkms_device(job->fb->dev);
0106     vkms_set_composer(&vkmsdev->output, false);
0107     kfree(vkmsjob);
0108 }
0109
0110 static void vkms_wb_atomic_commit(struct drm_connector *conn,
0111                   struct drm_atomic_state *state)
0112 {
0113     struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
0114                                              conn);
0115     struct vkms_device *vkmsdev = drm_device_to_vkms_device(conn->dev);
0116     struct vkms_output *output = &vkmsdev->output;
0117     struct drm_writeback_connector *wb_conn = &output->wb_connector;
0118     struct drm_connector_state *conn_state = wb_conn->base.state;
0119     struct vkms_crtc_state *crtc_state = output->composer_state;
0120
0121     if (!conn_state)
0122         return;
0123
0124     vkms_set_composer(&vkmsdev->output, true);
0125
0126     spin_lock_irq(&output->composer_lock);
0127     crtc_state->active_writeback = conn_state->writeback_job->priv;
0128     crtc_state->wb_pending = true;
0129     spin_unlock_irq(&output->composer_lock);
0130     drm_writeback_queue_job(wb_conn, connector_state);
0131 }
0132
0133 static const struct drm_connector_helper_funcs vkms_wb_conn_helper_funcs = {
0134     .get_modes = vkms_wb_connector_get_modes,
0135     .prepare_writeback_job = vkms_wb_prepare_job,
0136     .cleanup_writeback_job = vkms_wb_cleanup_job,
0137     .atomic_commit = vkms_wb_atomic_commit,
0138 };
0139
0140 int vkms_enable_writeback_connector(struct vkms_device *vkmsdev)
0141 {
0142     struct drm_writeback_connector *wb = &vkmsdev->output.wb_connector;
0143
0144     drm_connector_helper_add(&wb->base, &vkms_wb_conn_helper_funcs);
0145
0146     return drm_writeback_connector_init(&vkmsdev->drm, wb,
0147                         &vkms_wb_connector_funcs,
0148                         &vkms_wb_encoder_helper_funcs,
0149                         vkms_wb_formats,
0150                         ARRAY_SIZE(vkms_wb_formats),
0151                         1);
0152 }