drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* Hisilicon Hibmc SoC drm driver
   3  *
   4  * Based on the bochs drm driver.
   5  *
   6  * Copyright (c) 2016 Huawei Limited.
   7  *
   8  * Author:
   9  *      Rongrong Zou <zourongrong@huawei.com>
  10  *      Rongrong Zou <zourongrong@gmail.com>
  11  *      Jianhua Li <lijianhua@huawei.com>
  12  */
  13
  14 #include <linux/pci.h>
  15
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_gem.h>
  18 #include <drm/drm_gem_framebuffer_helper.h>
  19 #include <drm/drm_gem_vram_helper.h>
  20 #include <drm/drm_print.h>
  21
  22 #include "hibmc_drm_drv.h"
  23
  24 int hibmc_mm_init(struct hibmc_drm_private *hibmc)
  25 {
  26         struct drm_vram_mm *vmm;
  27         int ret;
  28         struct drm_device *dev = hibmc->dev;
  29
  30         vmm = drm_vram_helper_alloc_mm(dev,
  31                                        pci_resource_start(dev->pdev, 0),
  32                                        hibmc->fb_size);
  33         if (IS_ERR(vmm)) {
  34                 ret = PTR_ERR(vmm);
  35                 DRM_ERROR("Error initializing VRAM MM; %d\n", ret);
  36                 return ret;
  37         }
  38
  39         return 0;
  40 }
  41
  42 void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
  43 {
  44         if (!hibmc->dev->vram_mm)
  45                 return;
  46
  47         drm_vram_helper_release_mm(hibmc->dev);
  48 }
  49
  50 int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
  51                      struct drm_gem_object **obj)
  52 {
  53         struct drm_gem_vram_object *gbo;
  54         int ret;
  55
  56         *obj = NULL;
  57
  58         size = roundup(size, PAGE_SIZE);
  59         if (size == 0)
  60                 return -EINVAL;
  61
  62         gbo = drm_gem_vram_create(dev, &dev->vram_mm->bdev, size, 0, false);
  63         if (IS_ERR(gbo)) {
  64                 ret = PTR_ERR(gbo);
  65                 if (ret != -ERESTARTSYS)
  66                         DRM_ERROR("failed to allocate GEM object: %d\n", ret);
  67                 return ret;
  68         }
  69         *obj = &gbo->bo.base;
  70         return 0;
  71 }
  72
  73 int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
  74                       struct drm_mode_create_dumb *args)
  75 {
  76         struct drm_gem_object *gobj;
  77         u32 handle;
  78         int ret;
  79
  80         args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 16);
  81         args->size = args->pitch * args->height;
  82
  83         ret = hibmc_gem_create(dev, args->size, false,
  84                                &gobj);
  85         if (ret) {
  86                 DRM_ERROR("failed to create GEM object: %d\n", ret);
  87                 return ret;
  88         }
  89
  90         ret = drm_gem_handle_create(file, gobj, &handle);
  91         drm_gem_object_put_unlocked(gobj);
  92         if (ret) {
  93                 DRM_ERROR("failed to unreference GEM object: %d\n", ret);
  94                 return ret;
  95         }
  96
  97         args->handle = handle;
  98         return 0;
  99 }
 100
 101 const struct drm_mode_config_funcs hibmc_mode_funcs = {
 102         .atomic_check = drm_atomic_helper_check,
 103         .atomic_commit = drm_atomic_helper_commit,
 104         .fb_create = drm_gem_fb_create,
 105 };