drivers/gpu/drm/vkms/vkms_writeback.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #include <linux/dma-buf-map.h>
   4
   5 #include <drm/drm_atomic.h>
   6 #include <drm/drm_fourcc.h>
   7 #include <drm/drm_writeback.h>
   8 #include <drm/drm_probe_helper.h>
   9 #include <drm/drm_atomic_helper.h>
  10 #include <drm/drm_gem_framebuffer_helper.h>
  11 #include <drm/drm_gem_shmem_helper.h>
  12
  13 #include "vkms_drv.h"
  14
  15 static const u32 vkms_wb_formats[] = {
  16         DRM_FORMAT_XRGB8888,
  17 };
  18
  19 static const struct drm_connector_funcs vkms_wb_connector_funcs = {
  20         .fill_modes = drm_helper_probe_single_connector_modes,
  21         .destroy = drm_connector_cleanup,
  22         .reset = drm_atomic_helper_connector_reset,
  23         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  24         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  25 };
  26
  27 static int vkms_wb_encoder_atomic_check(struct drm_encoder *encoder,
  28                                         struct drm_crtc_state *crtc_state,
  29                                         struct drm_connector_state *conn_state)
  30 {
  31         struct drm_framebuffer *fb;
  32         const struct drm_display_mode *mode = &crtc_state->mode;
  33
  34         if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
  35                 return 0;
  36
  37         fb = conn_state->writeback_job->fb;
  38         if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
  39                 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
  40                               fb->width, fb->height);
  41                 return -EINVAL;
  42         }
  43
  44         if (fb->format->format != vkms_wb_formats[0]) {
  45                 DRM_DEBUG_KMS("Invalid pixel format %p4cc\n",
  46                               &fb->format->format);
  47                 return -EINVAL;
  48         }
  49
  50         return 0;
  51 }
  52
  53 static const struct drm_encoder_helper_funcs vkms_wb_encoder_helper_funcs = {
  54         .atomic_check = vkms_wb_encoder_atomic_check,
  55 };
  56
  57 static int vkms_wb_connector_get_modes(struct drm_connector *connector)
  58 {
  59         struct drm_device *dev = connector->dev;
  60
  61         return drm_add_modes_noedid(connector, dev->mode_config.max_width,
  62                                     dev->mode_config.max_height);
  63 }
  64
  65 static int vkms_wb_prepare_job(struct drm_writeback_connector *wb_connector,
  66                                struct drm_writeback_job *job)
  67 {
  68         struct drm_gem_object *gem_obj;
  69         struct dma_buf_map map;
  70         int ret;
  71
  72         if (!job->fb)
  73                 return 0;
  74
  75         gem_obj = drm_gem_fb_get_obj(job->fb, 0);
  76         ret = drm_gem_shmem_vmap(gem_obj, &map);
  77         if (ret) {
  78                 DRM_ERROR("vmap failed: %d\n", ret);
  79                 return ret;
  80         }
  81
  82         job->priv = map.vaddr;
  83
  84         return 0;
  85 }
  86
  87 static void vkms_wb_cleanup_job(struct drm_writeback_connector *connector,
  88                                 struct drm_writeback_job *job)
  89 {
  90         struct drm_gem_object *gem_obj;
  91         struct vkms_device *vkmsdev;
  92         struct dma_buf_map map;
  93
  94         if (!job->fb)
  95                 return;
  96
  97         gem_obj = drm_gem_fb_get_obj(job->fb, 0);
  98         dma_buf_map_set_vaddr(&map, job->priv);
  99         drm_gem_shmem_vunmap(gem_obj, &map);
 100
 101         vkmsdev = drm_device_to_vkms_device(gem_obj->dev);
 102         vkms_set_composer(&vkmsdev->output, false);
 103 }
 104
 105 static void vkms_wb_atomic_commit(struct drm_connector *conn,
 106                                   struct drm_atomic_state *state)
 107 {
 108         struct drm_connector_state *connector_state = drm_atomic_get_new_connector_state(state,
 109                                                                                          conn);
 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, connector_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 }