drivers/gpu/drm/msm/msm_fbdev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2013 Red Hat
   4  * Author: Rob Clark <robdclark@gmail.com>
   5  */
   6
   7 #include <drm/drm_crtc.h>
   8 #include <drm/drm_fb_helper.h>
   9
  10 #include "msm_drv.h"
  11 #include "msm_kms.h"
  12
  13 extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
  14                                         struct vm_area_struct *vma);
  15 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
  16
  17 /*
  18  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  19  */
  20
  21 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
  22
  23 struct msm_fbdev {
  24         struct drm_fb_helper base;
  25         struct drm_framebuffer *fb;
  26 };
  27
  28 static struct fb_ops msm_fb_ops = {
  29         .owner = THIS_MODULE,
  30         DRM_FB_HELPER_DEFAULT_OPS,
  31
  32         /* Note: to properly handle manual update displays, we wrap the
  33          * basic fbdev ops which write to the framebuffer
  34          */
  35         .fb_read = drm_fb_helper_sys_read,
  36         .fb_write = drm_fb_helper_sys_write,
  37         .fb_fillrect = drm_fb_helper_sys_fillrect,
  38         .fb_copyarea = drm_fb_helper_sys_copyarea,
  39         .fb_imageblit = drm_fb_helper_sys_imageblit,
  40         .fb_mmap = msm_fbdev_mmap,
  41 };
  42
  43 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
  44 {
  45         struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
  46         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  47         struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
  48         int ret = 0;
  49
  50         ret = drm_gem_mmap_obj(bo, bo->size, vma);
  51         if (ret) {
  52                 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
  53                 return ret;
  54         }
  55
  56         return msm_gem_mmap_obj(bo, vma);
  57 }
  58
  59 static int msm_fbdev_create(struct drm_fb_helper *helper,
  60                 struct drm_fb_helper_surface_size *sizes)
  61 {
  62         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  63         struct drm_device *dev = helper->dev;
  64         struct msm_drm_private *priv = dev->dev_private;
  65         struct drm_framebuffer *fb = NULL;
  66         struct drm_gem_object *bo;
  67         struct fb_info *fbi = NULL;
  68         uint64_t paddr;
  69         uint32_t format;
  70         int ret, pitch;
  71
  72         format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
  73
  74         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  75                         sizes->surface_height, sizes->surface_bpp,
  76                         sizes->fb_width, sizes->fb_height);
  77
  78         pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
  79         fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
  80                         sizes->surface_height, pitch, format);
  81
  82         if (IS_ERR(fb)) {
  83                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
  84                 return PTR_ERR(fb);
  85         }
  86
  87         bo = msm_framebuffer_bo(fb, 0);
  88
  89         mutex_lock(&dev->struct_mutex);
  90
  91         /*
  92          * NOTE: if we can be guaranteed to be able to map buffer
  93          * in panic (ie. lock-safe, etc) we could avoid pinning the
  94          * buffer now:
  95          */
  96         ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
  97         if (ret) {
  98                 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
  99                 goto fail_unlock;
 100         }
 101
 102         fbi = drm_fb_helper_alloc_fbi(helper);
 103         if (IS_ERR(fbi)) {
 104                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
 105                 ret = PTR_ERR(fbi);
 106                 goto fail_unlock;
 107         }
 108
 109         DBG("fbi=%p, dev=%p", fbi, dev);
 110
 111         fbdev->fb = fb;
 112         helper->fb = fb;
 113
 114         fbi->fbops = &msm_fb_ops;
 115
 116         drm_fb_helper_fill_info(fbi, helper, sizes);
 117
 118         dev->mode_config.fb_base = paddr;
 119
 120         fbi->screen_base = msm_gem_get_vaddr(bo);
 121         if (IS_ERR(fbi->screen_base)) {
 122                 ret = PTR_ERR(fbi->screen_base);
 123                 goto fail_unlock;
 124         }
 125         fbi->screen_size = bo->size;
 126         fbi->fix.smem_start = paddr;
 127         fbi->fix.smem_len = bo->size;
 128
 129         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 130         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 131
 132         mutex_unlock(&dev->struct_mutex);
 133
 134         return 0;
 135
 136 fail_unlock:
 137         mutex_unlock(&dev->struct_mutex);
 138         drm_framebuffer_remove(fb);
 139         return ret;
 140 }
 141
 142 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 143         .fb_probe = msm_fbdev_create,
 144 };
 145
 146 /* initialize fbdev helper */
 147 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 148 {
 149         struct msm_drm_private *priv = dev->dev_private;
 150         struct msm_fbdev *fbdev = NULL;
 151         struct drm_fb_helper *helper;
 152         int ret;
 153
 154         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 155         if (!fbdev)
 156                 goto fail;
 157
 158         helper = &fbdev->base;
 159
 160         drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
 161
 162         ret = drm_fb_helper_init(dev, helper, priv->num_connectors);
 163         if (ret) {
 164                 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
 165                 goto fail;
 166         }
 167
 168         ret = drm_fb_helper_single_add_all_connectors(helper);
 169         if (ret)
 170                 goto fini;
 171
 172         ret = drm_fb_helper_initial_config(helper, 32);
 173         if (ret)
 174                 goto fini;
 175
 176         priv->fbdev = helper;
 177
 178         return helper;
 179
 180 fini:
 181         drm_fb_helper_fini(helper);
 182 fail:
 183         kfree(fbdev);
 184         return NULL;
 185 }
 186
 187 void msm_fbdev_free(struct drm_device *dev)
 188 {
 189         struct msm_drm_private *priv = dev->dev_private;
 190         struct drm_fb_helper *helper = priv->fbdev;
 191         struct msm_fbdev *fbdev;
 192
 193         DBG();
 194
 195         drm_fb_helper_unregister_fbi(helper);
 196
 197         drm_fb_helper_fini(helper);
 198
 199         fbdev = to_msm_fbdev(priv->fbdev);
 200
 201         /* this will free the backing object */
 202         if (fbdev->fb) {
 203                 struct drm_gem_object *bo =
 204                         msm_framebuffer_bo(fbdev->fb, 0);
 205                 msm_gem_put_vaddr(bo);
 206                 drm_framebuffer_remove(fbdev->fb);
 207         }
 208
 209         kfree(fbdev);
 210
 211         priv->fbdev = NULL;
 212 }