drivers/gpu/drm/exynos/exynos_drm_fb.c

   1 /* exynos_drm_fb.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_crtc.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_fb_helper.h>
  19 #include <uapi/drm/exynos_drm.h>
  20
  21 #include "exynos_drm_drv.h"
  22 #include "exynos_drm_fb.h"
  23 #include "exynos_drm_gem.h"
  24 #include "exynos_drm_iommu.h"
  25 #include "exynos_drm_encoder.h"
  26
  27 #define to_exynos_fb(x) container_of(x, struct exynos_drm_fb, fb)
  28
  29 /*
  30  * exynos specific framebuffer structure.
  31  *
  32  * @fb: drm framebuffer obejct.
  33  * @buf_cnt: a buffer count to drm framebuffer.
  34  * @exynos_gem_obj: array of exynos specific gem object containing a gem object.
  35  */
  36 struct exynos_drm_fb {
  37         struct drm_framebuffer          fb;
  38         unsigned int                    buf_cnt;
  39         struct exynos_drm_gem_obj       *exynos_gem_obj[MAX_FB_BUFFER];
  40 };
  41
  42 static int check_fb_gem_memory_type(struct drm_device *drm_dev,
  43                                 struct exynos_drm_gem_obj *exynos_gem_obj)
  44 {
  45         unsigned int flags;
  46
  47         /*
  48          * if exynos drm driver supports iommu then framebuffer can use
  49          * all the buffer types.
  50          */
  51         if (is_drm_iommu_supported(drm_dev))
  52                 return 0;
  53
  54         flags = exynos_gem_obj->flags;
  55
  56         /*
  57          * without iommu support, not support physically non-continuous memory
  58          * for framebuffer.
  59          */
  60         if (IS_NONCONTIG_BUFFER(flags)) {
  61                 DRM_ERROR("cannot use this gem memory type for fb.\n");
  62                 return -EINVAL;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static void exynos_drm_fb_destroy(struct drm_framebuffer *fb)
  69 {
  70         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  71         unsigned int i;
  72
  73         DRM_DEBUG_KMS("%s\n", __FILE__);
  74
  75         /* make sure that overlay data are updated before relesing fb. */
  76         exynos_drm_encoder_complete_scanout(fb);
  77
  78         drm_framebuffer_cleanup(fb);
  79
  80         for (i = 0; i < ARRAY_SIZE(exynos_fb->exynos_gem_obj); i++) {
  81                 struct drm_gem_object *obj;
  82
  83                 if (exynos_fb->exynos_gem_obj[i] == NULL)
  84                         continue;
  85
  86                 obj = &exynos_fb->exynos_gem_obj[i]->base;
  87                 drm_gem_object_unreference_unlocked(obj);
  88         }
  89
  90         kfree(exynos_fb);
  91         exynos_fb = NULL;
  92 }
  93
  94 static int exynos_drm_fb_create_handle(struct drm_framebuffer *fb,
  95                                         struct drm_file *file_priv,
  96                                         unsigned int *handle)
  97 {
  98         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
  99
 100         DRM_DEBUG_KMS("%s\n", __FILE__);
 101
 102         return drm_gem_handle_create(file_priv,
 103                         &exynos_fb->exynos_gem_obj[0]->base, handle);
 104 }
 105
 106 static int exynos_drm_fb_dirty(struct drm_framebuffer *fb,
 107                                 struct drm_file *file_priv, unsigned flags,
 108                                 unsigned color, struct drm_clip_rect *clips,
 109                                 unsigned num_clips)
 110 {
 111         DRM_DEBUG_KMS("%s\n", __FILE__);
 112
 113         /* TODO */
 114
 115         return 0;
 116 }
 117
 118 static struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 119         .destroy        = exynos_drm_fb_destroy,
 120         .create_handle  = exynos_drm_fb_create_handle,
 121         .dirty          = exynos_drm_fb_dirty,
 122 };
 123
 124 void exynos_drm_fb_set_buf_cnt(struct drm_framebuffer *fb,
 125                                                 unsigned int cnt)
 126 {
 127         struct exynos_drm_fb *exynos_fb;
 128
 129         exynos_fb = to_exynos_fb(fb);
 130
 131         exynos_fb->buf_cnt = cnt;
 132 }
 133
 134 unsigned int exynos_drm_fb_get_buf_cnt(struct drm_framebuffer *fb)
 135 {
 136         struct exynos_drm_fb *exynos_fb;
 137
 138         exynos_fb = to_exynos_fb(fb);
 139
 140         return exynos_fb->buf_cnt;
 141 }
 142
 143 struct drm_framebuffer *
 144 exynos_drm_framebuffer_init(struct drm_device *dev,
 145                             struct drm_mode_fb_cmd2 *mode_cmd,
 146                             struct drm_gem_object *obj)
 147 {
 148         struct exynos_drm_fb *exynos_fb;
 149         struct exynos_drm_gem_obj *exynos_gem_obj;
 150         int ret;
 151
 152         exynos_gem_obj = to_exynos_gem_obj(obj);
 153
 154         ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 155         if (ret < 0) {
 156                 DRM_ERROR("cannot use this gem memory type for fb.\n");
 157                 return ERR_PTR(-EINVAL);
 158         }
 159
 160         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 161         if (!exynos_fb) {
 162                 DRM_ERROR("failed to allocate exynos drm framebuffer\n");
 163                 return ERR_PTR(-ENOMEM);
 164         }
 165
 166         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 167         exynos_fb->exynos_gem_obj[0] = exynos_gem_obj;
 168
 169         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 170         if (ret) {
 171                 DRM_ERROR("failed to initialize framebuffer\n");
 172                 return ERR_PTR(ret);
 173         }
 174
 175         return &exynos_fb->fb;
 176 }
 177
 178 static u32 exynos_drm_format_num_buffers(struct drm_mode_fb_cmd2 *mode_cmd)
 179 {
 180         unsigned int cnt = 0;
 181
 182         if (mode_cmd->pixel_format != DRM_FORMAT_NV12)
 183                 return drm_format_num_planes(mode_cmd->pixel_format);
 184
 185         while (cnt != MAX_FB_BUFFER) {
 186                 if (!mode_cmd->handles[cnt])
 187                         break;
 188                 cnt++;
 189         }
 190
 191         /*
 192          * check if NV12 or NV12M.
 193          *
 194          * NV12
 195          * handles[0] = base1, offsets[0] = 0
 196          * handles[1] = base1, offsets[1] = Y_size
 197          *
 198          * NV12M
 199          * handles[0] = base1, offsets[0] = 0
 200          * handles[1] = base2, offsets[1] = 0
 201          */
 202         if (cnt == 2) {
 203                 /*
 204                  * in case of NV12 format, offsets[1] is not 0 and
 205                  * handles[0] is same as handles[1].
 206                  */
 207                 if (mode_cmd->offsets[1] &&
 208                         mode_cmd->handles[0] == mode_cmd->handles[1])
 209                         cnt = 1;
 210         }
 211
 212         return cnt;
 213 }
 214
 215 static struct drm_framebuffer *
 216 exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 217                       struct drm_mode_fb_cmd2 *mode_cmd)
 218 {
 219         struct drm_gem_object *obj;
 220         struct exynos_drm_fb *exynos_fb;
 221         int i, ret;
 222
 223         DRM_DEBUG_KMS("%s\n", __FILE__);
 224
 225         obj = drm_gem_object_lookup(dev, file_priv, mode_cmd->handles[0]);
 226         if (!obj) {
 227                 DRM_ERROR("failed to lookup gem object\n");
 228                 return ERR_PTR(-ENOENT);
 229         }
 230
 231         exynos_fb = kzalloc(sizeof(*exynos_fb), GFP_KERNEL);
 232         if (!exynos_fb) {
 233                 DRM_ERROR("failed to allocate exynos drm framebuffer\n");
 234                 return ERR_PTR(-ENOMEM);
 235         }
 236
 237         drm_helper_mode_fill_fb_struct(&exynos_fb->fb, mode_cmd);
 238         exynos_fb->exynos_gem_obj[0] = to_exynos_gem_obj(obj);
 239         exynos_fb->buf_cnt = exynos_drm_format_num_buffers(mode_cmd);
 240
 241         DRM_DEBUG_KMS("buf_cnt = %d\n", exynos_fb->buf_cnt);
 242
 243         for (i = 1; i < exynos_fb->buf_cnt; i++) {
 244                 struct exynos_drm_gem_obj *exynos_gem_obj;
 245                 int ret;
 246
 247                 obj = drm_gem_object_lookup(dev, file_priv,
 248                                 mode_cmd->handles[i]);
 249                 if (!obj) {
 250                         DRM_ERROR("failed to lookup gem object\n");
 251                         kfree(exynos_fb);
 252                         return ERR_PTR(-ENOENT);
 253                 }
 254
 255                 exynos_gem_obj = to_exynos_gem_obj(obj);
 256
 257                 ret = check_fb_gem_memory_type(dev, exynos_gem_obj);
 258                 if (ret < 0) {
 259                         DRM_ERROR("cannot use this gem memory type for fb.\n");
 260                         kfree(exynos_fb);
 261                         return ERR_PTR(ret);
 262                 }
 263
 264                 exynos_fb->exynos_gem_obj[i] = to_exynos_gem_obj(obj);
 265         }
 266
 267         ret = drm_framebuffer_init(dev, &exynos_fb->fb, &exynos_drm_fb_funcs);
 268         if (ret) {
 269                 for (i = 0; i < exynos_fb->buf_cnt; i++) {
 270                         struct exynos_drm_gem_obj *gem_obj;
 271
 272                         gem_obj = exynos_fb->exynos_gem_obj[i];
 273                         drm_gem_object_unreference_unlocked(&gem_obj->base);
 274                 }
 275
 276                 kfree(exynos_fb);
 277                 return ERR_PTR(ret);
 278         }
 279
 280         return &exynos_fb->fb;
 281 }
 282
 283 struct exynos_drm_gem_buf *exynos_drm_fb_buffer(struct drm_framebuffer *fb,
 284                                                 int index)
 285 {
 286         struct exynos_drm_fb *exynos_fb = to_exynos_fb(fb);
 287         struct exynos_drm_gem_buf *buffer;
 288
 289         DRM_DEBUG_KMS("%s\n", __FILE__);
 290
 291         if (index >= MAX_FB_BUFFER)
 292                 return NULL;
 293
 294         buffer = exynos_fb->exynos_gem_obj[index]->buffer;
 295         if (!buffer)
 296                 return NULL;
 297
 298         DRM_DEBUG_KMS("dma_addr = 0x%lx\n", (unsigned long)buffer->dma_addr);
 299
 300         return buffer;
 301 }
 302
 303 static void exynos_drm_output_poll_changed(struct drm_device *dev)
 304 {
 305         struct exynos_drm_private *private = dev->dev_private;
 306         struct drm_fb_helper *fb_helper = private->fb_helper;
 307
 308         if (fb_helper)
 309                 drm_fb_helper_hotplug_event(fb_helper);
 310 }
 311
 312 static const struct drm_mode_config_funcs exynos_drm_mode_config_funcs = {
 313         .fb_create = exynos_user_fb_create,
 314         .output_poll_changed = exynos_drm_output_poll_changed,
 315 };
 316
 317 void exynos_drm_mode_config_init(struct drm_device *dev)
 318 {
 319         dev->mode_config.min_width = 0;
 320         dev->mode_config.min_height = 0;
 321
 322         /*
 323          * set max width and height as default value(4096x4096).
 324          * this value would be used to check framebuffer size limitation
 325          * at drm_mode_addfb().
 326          */
 327         dev->mode_config.max_width = 4096;
 328         dev->mode_config.max_height = 4096;
 329
 330         dev->mode_config.funcs = &exynos_drm_mode_config_funcs;
 331 }