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 #include <drm/drm_fourcc.h>
  10
  11 #include "msm_drv.h"
  12 #include "msm_kms.h"
  13
  14 extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
  15                                         struct vm_area_struct *vma);
  16 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
  17
  18 /*
  19  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  20  */
  21
  22 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
  23
  24 struct msm_fbdev {
  25         struct drm_fb_helper base;
  26         struct drm_framebuffer *fb;
  27 };
  28
  29 static const struct fb_ops msm_fb_ops = {
  30         .owner = THIS_MODULE,
  31         DRM_FB_HELPER_DEFAULT_OPS,
  32
  33         /* Note: to properly handle manual update displays, we wrap the
  34          * basic fbdev ops which write to the framebuffer
  35          */
  36         .fb_read = drm_fb_helper_sys_read,
  37         .fb_write = drm_fb_helper_sys_write,
  38         .fb_fillrect = drm_fb_helper_sys_fillrect,
  39         .fb_copyarea = drm_fb_helper_sys_copyarea,
  40         .fb_imageblit = drm_fb_helper_sys_imageblit,
  41         .fb_mmap = msm_fbdev_mmap,
  42 };
  43
  44 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
  45 {
  46         struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
  47         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  48         struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
  49         int ret = 0;
  50
  51         ret = drm_gem_mmap_obj(bo, bo->size, vma);
  52         if (ret) {
  53                 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
  54                 return ret;
  55         }
  56
  57         return msm_gem_mmap_obj(bo, vma);
  58 }
  59
  60 static int msm_fbdev_create(struct drm_fb_helper *helper,
  61                 struct drm_fb_helper_surface_size *sizes)
  62 {
  63         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  64         struct drm_device *dev = helper->dev;
  65         struct msm_drm_private *priv = dev->dev_private;
  66         struct drm_framebuffer *fb = NULL;
  67         struct drm_gem_object *bo;
  68         struct fb_info *fbi = NULL;
  69         uint64_t paddr;
  70         uint32_t format;
  71         int ret, pitch;
  72
  73         format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
  74
  75         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  76                         sizes->surface_height, sizes->surface_bpp,
  77                         sizes->fb_width, sizes->fb_height);
  78
  79         pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
  80         fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
  81                         sizes->surface_height, pitch, format);
  82
  83         if (IS_ERR(fb)) {
  84                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
  85                 return PTR_ERR(fb);
  86         }
  87
  88         bo = msm_framebuffer_bo(fb, 0);
  89
  90         mutex_lock(&dev->struct_mutex);
  91
  92         /*
  93          * NOTE: if we can be guaranteed to be able to map buffer
  94          * in panic (ie. lock-safe, etc) we could avoid pinning the
  95          * buffer now:
  96          */
  97         ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
  98         if (ret) {
  99                 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 100                 goto fail_unlock;
 101         }
 102
 103         fbi = drm_fb_helper_alloc_fbi(helper);
 104         if (IS_ERR(fbi)) {
 105                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
 106                 ret = PTR_ERR(fbi);
 107                 goto fail_unlock;
 108         }
 109
 110         DBG("fbi=%p, dev=%p", fbi, dev);
 111
 112         fbdev->fb = fb;
 113         helper->fb = fb;
 114
 115         fbi->fbops = &msm_fb_ops;
 116
 117         drm_fb_helper_fill_info(fbi, helper, sizes);
 118
 119         dev->mode_config.fb_base = paddr;
 120
 121         fbi->screen_base = msm_gem_get_vaddr(bo);
 122         if (IS_ERR(fbi->screen_base)) {
 123                 ret = PTR_ERR(fbi->screen_base);
 124                 goto fail_unlock;
 125         }
 126         fbi->screen_size = bo->size;
 127         fbi->fix.smem_start = paddr;
 128         fbi->fix.smem_len = bo->size;
 129
 130         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 131         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 132
 133         mutex_unlock(&dev->struct_mutex);
 134
 135         return 0;
 136
 137 fail_unlock:
 138         mutex_unlock(&dev->struct_mutex);
 139         drm_framebuffer_remove(fb);
 140         return ret;
 141 }
 142
 143 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 144         .fb_probe = msm_fbdev_create,
 145 };
 146
 147 /* initialize fbdev helper */
 148 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 149 {
 150         struct msm_drm_private *priv = dev->dev_private;
 151         struct msm_fbdev *fbdev = NULL;
 152         struct drm_fb_helper *helper;
 153         int ret;
 154
 155         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 156         if (!fbdev)
 157                 goto fail;
 158
 159         helper = &fbdev->base;
 160
 161         drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
 162
 163         ret = drm_fb_helper_init(dev, helper);
 164         if (ret) {
 165                 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
 166                 goto fail;
 167         }
 168
 169         /* the fw fb could be anywhere in memory */
 170         drm_fb_helper_remove_conflicting_framebuffers(NULL, "msm", false);
 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 }