drivers/gpu/drm/bochs/bochs_kms.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  */
   7
   8 #include "bochs.h"
   9 #include <drm/drm_plane_helper.h>
  10
  11 static int defx = 1024;
  12 static int defy = 768;
  13
  14 module_param(defx, int, 0444);
  15 module_param(defy, int, 0444);
  16 MODULE_PARM_DESC(defx, "default x resolution");
  17 MODULE_PARM_DESC(defy, "default y resolution");
  18
  19 /* ---------------------------------------------------------------------- */
  20
  21 static void bochs_crtc_dpms(struct drm_crtc *crtc, int mode)
  22 {
  23         switch (mode) {
  24         case DRM_MODE_DPMS_ON:
  25         case DRM_MODE_DPMS_STANDBY:
  26         case DRM_MODE_DPMS_SUSPEND:
  27         case DRM_MODE_DPMS_OFF:
  28         default:
  29                 return;
  30         }
  31 }
  32
  33 static int bochs_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
  34                                     struct drm_framebuffer *old_fb)
  35 {
  36         struct bochs_device *bochs =
  37                 container_of(crtc, struct bochs_device, crtc);
  38         struct bochs_framebuffer *bochs_fb;
  39         struct bochs_bo *bo;
  40         u64 gpu_addr = 0;
  41         int ret;
  42
  43         if (old_fb) {
  44                 bochs_fb = to_bochs_framebuffer(old_fb);
  45                 bo = gem_to_bochs_bo(bochs_fb->obj);
  46                 ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
  47                 if (ret) {
  48                         DRM_ERROR("failed to reserve old_fb bo\n");
  49                 } else {
  50                         bochs_bo_unpin(bo);
  51                         ttm_bo_unreserve(&bo->bo);
  52                 }
  53         }
  54
  55         if (WARN_ON(crtc->primary->fb == NULL))
  56                 return -EINVAL;
  57
  58         bochs_fb = to_bochs_framebuffer(crtc->primary->fb);
  59         bo = gem_to_bochs_bo(bochs_fb->obj);
  60         ret = ttm_bo_reserve(&bo->bo, true, false, NULL);
  61         if (ret)
  62                 return ret;
  63
  64         ret = bochs_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
  65         if (ret) {
  66                 ttm_bo_unreserve(&bo->bo);
  67                 return ret;
  68         }
  69
  70         ttm_bo_unreserve(&bo->bo);
  71         bochs_hw_setbase(bochs, x, y, gpu_addr);
  72         return 0;
  73 }
  74
  75 static int bochs_crtc_mode_set(struct drm_crtc *crtc,
  76                                struct drm_display_mode *mode,
  77                                struct drm_display_mode *adjusted_mode,
  78                                int x, int y, struct drm_framebuffer *old_fb)
  79 {
  80         struct bochs_device *bochs =
  81                 container_of(crtc, struct bochs_device, crtc);
  82
  83         bochs_hw_setmode(bochs, mode);
  84         bochs_crtc_mode_set_base(crtc, x, y, old_fb);
  85         return 0;
  86 }
  87
  88 static void bochs_crtc_prepare(struct drm_crtc *crtc)
  89 {
  90 }
  91
  92 static void bochs_crtc_commit(struct drm_crtc *crtc)
  93 {
  94 }
  95
  96 static int bochs_crtc_page_flip(struct drm_crtc *crtc,
  97                                 struct drm_framebuffer *fb,
  98                                 struct drm_pending_vblank_event *event,
  99                                 uint32_t page_flip_flags,
 100                                 struct drm_modeset_acquire_ctx *ctx)
 101 {
 102         struct bochs_device *bochs =
 103                 container_of(crtc, struct bochs_device, crtc);
 104         struct drm_framebuffer *old_fb = crtc->primary->fb;
 105         unsigned long irqflags;
 106
 107         crtc->primary->fb = fb;
 108         bochs_crtc_mode_set_base(crtc, 0, 0, old_fb);
 109         if (event) {
 110                 spin_lock_irqsave(&bochs->dev->event_lock, irqflags);
 111                 drm_crtc_send_vblank_event(crtc, event);
 112                 spin_unlock_irqrestore(&bochs->dev->event_lock, irqflags);
 113         }
 114         return 0;
 115 }
 116
 117 /* These provide the minimum set of functions required to handle a CRTC */
 118 static const struct drm_crtc_funcs bochs_crtc_funcs = {
 119         .set_config = drm_crtc_helper_set_config,
 120         .destroy = drm_crtc_cleanup,
 121         .page_flip = bochs_crtc_page_flip,
 122 };
 123
 124 static const struct drm_crtc_helper_funcs bochs_helper_funcs = {
 125         .dpms = bochs_crtc_dpms,
 126         .mode_set = bochs_crtc_mode_set,
 127         .mode_set_base = bochs_crtc_mode_set_base,
 128         .prepare = bochs_crtc_prepare,
 129         .commit = bochs_crtc_commit,
 130 };
 131
 132 static void bochs_crtc_init(struct drm_device *dev)
 133 {
 134         struct bochs_device *bochs = dev->dev_private;
 135         struct drm_crtc *crtc = &bochs->crtc;
 136
 137         drm_crtc_init(dev, crtc, &bochs_crtc_funcs);
 138         drm_crtc_helper_add(crtc, &bochs_helper_funcs);
 139 }
 140
 141 static void bochs_encoder_mode_set(struct drm_encoder *encoder,
 142                                    struct drm_display_mode *mode,
 143                                    struct drm_display_mode *adjusted_mode)
 144 {
 145 }
 146
 147 static void bochs_encoder_dpms(struct drm_encoder *encoder, int state)
 148 {
 149 }
 150
 151 static void bochs_encoder_prepare(struct drm_encoder *encoder)
 152 {
 153 }
 154
 155 static void bochs_encoder_commit(struct drm_encoder *encoder)
 156 {
 157 }
 158
 159 static const struct drm_encoder_helper_funcs bochs_encoder_helper_funcs = {
 160         .dpms = bochs_encoder_dpms,
 161         .mode_set = bochs_encoder_mode_set,
 162         .prepare = bochs_encoder_prepare,
 163         .commit = bochs_encoder_commit,
 164 };
 165
 166 static const struct drm_encoder_funcs bochs_encoder_encoder_funcs = {
 167         .destroy = drm_encoder_cleanup,
 168 };
 169
 170 static void bochs_encoder_init(struct drm_device *dev)
 171 {
 172         struct bochs_device *bochs = dev->dev_private;
 173         struct drm_encoder *encoder = &bochs->encoder;
 174
 175         encoder->possible_crtcs = 0x1;
 176         drm_encoder_init(dev, encoder, &bochs_encoder_encoder_funcs,
 177                          DRM_MODE_ENCODER_DAC, NULL);
 178         drm_encoder_helper_add(encoder, &bochs_encoder_helper_funcs);
 179 }
 180
 181
 182 static int bochs_connector_get_modes(struct drm_connector *connector)
 183 {
 184         int count;
 185
 186         count = drm_add_modes_noedid(connector, 8192, 8192);
 187         drm_set_preferred_mode(connector, defx, defy);
 188         return count;
 189 }
 190
 191 static enum drm_mode_status bochs_connector_mode_valid(struct drm_connector *connector,
 192                                       struct drm_display_mode *mode)
 193 {
 194         struct bochs_device *bochs =
 195                 container_of(connector, struct bochs_device, connector);
 196         unsigned long size = mode->hdisplay * mode->vdisplay * 4;
 197
 198         /*
 199          * Make sure we can fit two framebuffers into video memory.
 200          * This allows up to 1600x1200 with 16 MB (default size).
 201          * If you want more try this:
 202          *     'qemu -vga std -global VGA.vgamem_mb=32 $otherargs'
 203          */
 204         if (size * 2 > bochs->fb_size)
 205                 return MODE_BAD;
 206
 207         return MODE_OK;
 208 }
 209
 210 static struct drm_encoder *
 211 bochs_connector_best_encoder(struct drm_connector *connector)
 212 {
 213         int enc_id = connector->encoder_ids[0];
 214         /* pick the encoder ids */
 215         if (enc_id)
 216                 return drm_encoder_find(connector->dev, NULL, enc_id);
 217         return NULL;
 218 }
 219
 220 static const struct drm_connector_helper_funcs bochs_connector_connector_helper_funcs = {
 221         .get_modes = bochs_connector_get_modes,
 222         .mode_valid = bochs_connector_mode_valid,
 223         .best_encoder = bochs_connector_best_encoder,
 224 };
 225
 226 static const struct drm_connector_funcs bochs_connector_connector_funcs = {
 227         .dpms = drm_helper_connector_dpms,
 228         .fill_modes = drm_helper_probe_single_connector_modes,
 229         .destroy = drm_connector_cleanup,
 230 };
 231
 232 static void bochs_connector_init(struct drm_device *dev)
 233 {
 234         struct bochs_device *bochs = dev->dev_private;
 235         struct drm_connector *connector = &bochs->connector;
 236
 237         drm_connector_init(dev, connector, &bochs_connector_connector_funcs,
 238                            DRM_MODE_CONNECTOR_VIRTUAL);
 239         drm_connector_helper_add(connector,
 240                                  &bochs_connector_connector_helper_funcs);
 241         drm_connector_register(connector);
 242 }
 243
 244
 245 int bochs_kms_init(struct bochs_device *bochs)
 246 {
 247         drm_mode_config_init(bochs->dev);
 248         bochs->mode_config_initialized = true;
 249
 250         bochs->dev->mode_config.max_width = 8192;
 251         bochs->dev->mode_config.max_height = 8192;
 252
 253         bochs->dev->mode_config.fb_base = bochs->fb_base;
 254         bochs->dev->mode_config.preferred_depth = 24;
 255         bochs->dev->mode_config.prefer_shadow = 0;
 256
 257         bochs->dev->mode_config.funcs = &bochs_mode_funcs;
 258
 259         bochs_crtc_init(bochs->dev);
 260         bochs_encoder_init(bochs->dev);
 261         bochs_connector_init(bochs->dev);
 262         drm_connector_attach_encoder(&bochs->connector,
 263                                           &bochs->encoder);
 264
 265         return 0;
 266 }
 267
 268 void bochs_kms_fini(struct bochs_device *bochs)
 269 {
 270         if (bochs->mode_config_initialized) {
 271                 drm_mode_config_cleanup(bochs->dev);
 272                 bochs->mode_config_initialized = false;
 273         }
 274 }