drivers/gpu/drm/bochs/bochs_kms.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4
   5 #include <linux/moduleparam.h>
   6
   7 #include <drm/drm_atomic_helper.h>
   8 #include <drm/drm_gem_framebuffer_helper.h>
   9 #include <drm/drm_probe_helper.h>
  10 #include <drm/drm_vblank.h>
  11
  12 #include "bochs.h"
  13
  14 static int defx = 1024;
  15 static int defy = 768;
  16
  17 module_param(defx, int, 0444);
  18 module_param(defy, int, 0444);
  19 MODULE_PARM_DESC(defx, "default x resolution");
  20 MODULE_PARM_DESC(defy, "default y resolution");
  21
  22 /* ---------------------------------------------------------------------- */
  23
  24 static const uint32_t bochs_formats[] = {
  25         DRM_FORMAT_XRGB8888,
  26         DRM_FORMAT_BGRX8888,
  27 };
  28
  29 static void bochs_plane_update(struct bochs_device *bochs,
  30                                struct drm_plane_state *state)
  31 {
  32         struct drm_gem_vram_object *gbo;
  33
  34         if (!state->fb || !bochs->stride)
  35                 return;
  36
  37         gbo = drm_gem_vram_of_gem(state->fb->obj[0]);
  38         bochs_hw_setbase(bochs,
  39                          state->crtc_x,
  40                          state->crtc_y,
  41                          gbo->bo.offset);
  42         bochs_hw_setformat(bochs, state->fb->format);
  43 }
  44
  45 static void bochs_pipe_enable(struct drm_simple_display_pipe *pipe,
  46                               struct drm_crtc_state *crtc_state,
  47                               struct drm_plane_state *plane_state)
  48 {
  49         struct bochs_device *bochs = pipe->crtc.dev->dev_private;
  50
  51         bochs_hw_setmode(bochs, &crtc_state->mode);
  52         bochs_plane_update(bochs, plane_state);
  53 }
  54
  55 static void bochs_pipe_update(struct drm_simple_display_pipe *pipe,
  56                               struct drm_plane_state *old_state)
  57 {
  58         struct bochs_device *bochs = pipe->crtc.dev->dev_private;
  59         struct drm_crtc *crtc = &pipe->crtc;
  60
  61         bochs_plane_update(bochs, pipe->plane.state);
  62
  63         if (crtc->state->event) {
  64                 spin_lock_irq(&crtc->dev->event_lock);
  65                 drm_crtc_send_vblank_event(crtc, crtc->state->event);
  66                 crtc->state->event = NULL;
  67                 spin_unlock_irq(&crtc->dev->event_lock);
  68         }
  69 }
  70
  71 static int bochs_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
  72                                  struct drm_plane_state *new_state)
  73 {
  74         struct drm_gem_vram_object *gbo;
  75
  76         if (!new_state->fb)
  77                 return 0;
  78         gbo = drm_gem_vram_of_gem(new_state->fb->obj[0]);
  79         return drm_gem_vram_pin(gbo, DRM_GEM_VRAM_PL_FLAG_VRAM);
  80 }
  81
  82 static void bochs_pipe_cleanup_fb(struct drm_simple_display_pipe *pipe,
  83                                   struct drm_plane_state *old_state)
  84 {
  85         struct drm_gem_vram_object *gbo;
  86
  87         if (!old_state->fb)
  88                 return;
  89         gbo = drm_gem_vram_of_gem(old_state->fb->obj[0]);
  90         drm_gem_vram_unpin(gbo);
  91 }
  92
  93 static const struct drm_simple_display_pipe_funcs bochs_pipe_funcs = {
  94         .enable     = bochs_pipe_enable,
  95         .update     = bochs_pipe_update,
  96         .prepare_fb = bochs_pipe_prepare_fb,
  97         .cleanup_fb = bochs_pipe_cleanup_fb,
  98 };
  99
 100 static int bochs_connector_get_modes(struct drm_connector *connector)
 101 {
 102         struct bochs_device *bochs =
 103                 container_of(connector, struct bochs_device, connector);
 104         int count = 0;
 105
 106         if (bochs->edid)
 107                 count = drm_add_edid_modes(connector, bochs->edid);
 108
 109         if (!count) {
 110                 count = drm_add_modes_noedid(connector, 8192, 8192);
 111                 drm_set_preferred_mode(connector, defx, defy);
 112         }
 113         return count;
 114 }
 115
 116 static enum drm_mode_status bochs_connector_mode_valid(struct drm_connector *connector,
 117                                       struct drm_display_mode *mode)
 118 {
 119         struct bochs_device *bochs =
 120                 container_of(connector, struct bochs_device, connector);
 121         unsigned long size = mode->hdisplay * mode->vdisplay * 4;
 122
 123         /*
 124          * Make sure we can fit two framebuffers into video memory.
 125          * This allows up to 1600x1200 with 16 MB (default size).
 126          * If you want more try this:
 127          *     'qemu -vga std -global VGA.vgamem_mb=32 $otherargs'
 128          */
 129         if (size * 2 > bochs->fb_size)
 130                 return MODE_BAD;
 131
 132         return MODE_OK;
 133 }
 134
 135 static const struct drm_connector_helper_funcs bochs_connector_connector_helper_funcs = {
 136         .get_modes = bochs_connector_get_modes,
 137         .mode_valid = bochs_connector_mode_valid,
 138 };
 139
 140 static const struct drm_connector_funcs bochs_connector_connector_funcs = {
 141         .dpms = drm_helper_connector_dpms,
 142         .fill_modes = drm_helper_probe_single_connector_modes,
 143         .destroy = drm_connector_cleanup,
 144         .reset = drm_atomic_helper_connector_reset,
 145         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 146         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 147 };
 148
 149 static void bochs_connector_init(struct drm_device *dev)
 150 {
 151         struct bochs_device *bochs = dev->dev_private;
 152         struct drm_connector *connector = &bochs->connector;
 153
 154         drm_connector_init(dev, connector, &bochs_connector_connector_funcs,
 155                            DRM_MODE_CONNECTOR_VIRTUAL);
 156         drm_connector_helper_add(connector,
 157                                  &bochs_connector_connector_helper_funcs);
 158         drm_connector_register(connector);
 159
 160         bochs_hw_load_edid(bochs);
 161         if (bochs->edid) {
 162                 DRM_INFO("Found EDID data blob.\n");
 163                 drm_connector_attach_edid_property(connector);
 164                 drm_connector_update_edid_property(connector, bochs->edid);
 165         }
 166 }
 167
 168 static struct drm_framebuffer *
 169 bochs_gem_fb_create(struct drm_device *dev, struct drm_file *file,
 170                     const struct drm_mode_fb_cmd2 *mode_cmd)
 171 {
 172         if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888 &&
 173             mode_cmd->pixel_format != DRM_FORMAT_BGRX8888)
 174                 return ERR_PTR(-EINVAL);
 175
 176         return drm_gem_fb_create(dev, file, mode_cmd);
 177 }
 178
 179 const struct drm_mode_config_funcs bochs_mode_funcs = {
 180         .fb_create = bochs_gem_fb_create,
 181         .atomic_check = drm_atomic_helper_check,
 182         .atomic_commit = drm_atomic_helper_commit,
 183 };
 184
 185 int bochs_kms_init(struct bochs_device *bochs)
 186 {
 187         drm_mode_config_init(bochs->dev);
 188
 189         bochs->dev->mode_config.max_width = 8192;
 190         bochs->dev->mode_config.max_height = 8192;
 191
 192         bochs->dev->mode_config.fb_base = bochs->fb_base;
 193         bochs->dev->mode_config.preferred_depth = 24;
 194         bochs->dev->mode_config.prefer_shadow = 0;
 195         bochs->dev->mode_config.prefer_shadow_fbdev = 1;
 196         bochs->dev->mode_config.quirk_addfb_prefer_host_byte_order = true;
 197
 198         bochs->dev->mode_config.funcs = &bochs_mode_funcs;
 199
 200         bochs_connector_init(bochs->dev);
 201         drm_simple_display_pipe_init(bochs->dev,
 202                                      &bochs->pipe,
 203                                      &bochs_pipe_funcs,
 204                                      bochs_formats,
 205                                      ARRAY_SIZE(bochs_formats),
 206                                      NULL,
 207                                      &bochs->connector);
 208
 209         drm_mode_config_reset(bochs->dev);
 210
 211         return 0;
 212 }
 213
 214 void bochs_kms_fini(struct bochs_device *bochs)
 215 {
 216         drm_atomic_helper_shutdown(bochs->dev);
 217         drm_mode_config_cleanup(bochs->dev);
 218 }