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_gem.h"
  13 #include "msm_kms.h"
  14
  15 extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
  16                                         struct vm_area_struct *vma);
  17 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
  18
  19 /*
  20  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  21  */
  22
  23 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
  24
  25 struct msm_fbdev {
  26         struct drm_fb_helper base;
  27         struct drm_framebuffer *fb;
  28 };
  29
  30 static const struct fb_ops msm_fb_ops = {
  31         .owner = THIS_MODULE,
  32         DRM_FB_HELPER_DEFAULT_OPS,
  33
  34         /* Note: to properly handle manual update displays, we wrap the
  35          * basic fbdev ops which write to the framebuffer
  36          */
  37         .fb_read = drm_fb_helper_sys_read,
  38         .fb_write = drm_fb_helper_sys_write,
  39         .fb_fillrect = drm_fb_helper_sys_fillrect,
  40         .fb_copyarea = drm_fb_helper_sys_copyarea,
  41         .fb_imageblit = drm_fb_helper_sys_imageblit,
  42         .fb_mmap = msm_fbdev_mmap,
  43 };
  44
  45 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
  46 {
  47         struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
  48         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  49         struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
  50         int ret = 0;
  51
  52         ret = drm_gem_mmap_obj(bo, bo->size, vma);
  53         if (ret) {
  54                 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
  55                 return ret;
  56         }
  57
  58         return msm_gem_mmap_obj(bo, vma);
  59 }
  60
  61 static int msm_fbdev_create(struct drm_fb_helper *helper,
  62                 struct drm_fb_helper_surface_size *sizes)
  63 {
  64         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  65         struct drm_device *dev = helper->dev;
  66         struct msm_drm_private *priv = dev->dev_private;
  67         struct drm_framebuffer *fb = NULL;
  68         struct drm_gem_object *bo;
  69         struct fb_info *fbi = NULL;
  70         uint64_t paddr;
  71         uint32_t format;
  72         int ret, pitch;
  73
  74         format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
  75
  76         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  77                         sizes->surface_height, sizes->surface_bpp,
  78                         sizes->fb_width, sizes->fb_height);
  79
  80         pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
  81         fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
  82                         sizes->surface_height, pitch, format);
  83
  84         if (IS_ERR(fb)) {
  85                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
  86                 return PTR_ERR(fb);
  87         }
  88
  89         bo = msm_framebuffer_bo(fb, 0);
  90
  91         mutex_lock(&dev->struct_mutex);
  92
  93         /*
  94          * NOTE: if we can be guaranteed to be able to map buffer
  95          * in panic (ie. lock-safe, etc) we could avoid pinning the
  96          * buffer now:
  97          */
  98         ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
  99         if (ret) {
 100                 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 101                 goto fail_unlock;
 102         }
 103
 104         fbi = drm_fb_helper_alloc_fbi(helper);
 105         if (IS_ERR(fbi)) {
 106                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
 107                 ret = PTR_ERR(fbi);
 108                 goto fail_unlock;
 109         }
 110
 111         DBG("fbi=%p, dev=%p", fbi, dev);
 112
 113         fbdev->fb = fb;
 114         helper->fb = fb;
 115
 116         fbi->fbops = &msm_fb_ops;
 117
 118         drm_fb_helper_fill_info(fbi, helper, sizes);
 119
 120         dev->mode_config.fb_base = paddr;
 121
 122         fbi->screen_base = msm_gem_get_vaddr(bo);
 123         if (IS_ERR(fbi->screen_base)) {
 124                 ret = PTR_ERR(fbi->screen_base);
 125                 goto fail_unlock;
 126         }
 127         fbi->screen_size = bo->size;
 128         fbi->fix.smem_start = paddr;
 129         fbi->fix.smem_len = bo->size;
 130
 131         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 132         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 133
 134         mutex_unlock(&dev->struct_mutex);
 135
 136         return 0;
 137
 138 fail_unlock:
 139         mutex_unlock(&dev->struct_mutex);
 140         drm_framebuffer_remove(fb);
 141         return ret;
 142 }
 143
 144 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 145         .fb_probe = msm_fbdev_create,
 146 };
 147
 148 /* initialize fbdev helper */
 149 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 150 {
 151         struct msm_drm_private *priv = dev->dev_private;
 152         struct msm_fbdev *fbdev = NULL;
 153         struct drm_fb_helper *helper;
 154         int ret;
 155
 156         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 157         if (!fbdev)
 158                 goto fail;
 159
 160         helper = &fbdev->base;
 161
 162         drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
 163
 164         ret = drm_fb_helper_init(dev, helper);
 165         if (ret) {
 166                 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
 167                 goto fail;
 168         }
 169
 170         /* the fw fb could be anywhere in memory */
 171         drm_fb_helper_remove_conflicting_framebuffers(NULL, "msm", false);
 172
 173         ret = drm_fb_helper_initial_config(helper, 32);
 174         if (ret)
 175                 goto fini;
 176
 177         priv->fbdev = helper;
 178
 179         return helper;
 180
 181 fini:
 182         drm_fb_helper_fini(helper);
 183 fail:
 184         kfree(fbdev);
 185         return NULL;
 186 }
 187
 188 void msm_fbdev_free(struct drm_device *dev)
 189 {
 190         struct msm_drm_private *priv = dev->dev_private;
 191         struct drm_fb_helper *helper = priv->fbdev;
 192         struct msm_fbdev *fbdev;
 193
 194         DBG();
 195
 196         drm_fb_helper_unregister_fbi(helper);
 197
 198         drm_fb_helper_fini(helper);
 199
 200         fbdev = to_msm_fbdev(priv->fbdev);
 201
 202         /* this will free the backing object */
 203         if (fbdev->fb) {
 204                 struct drm_gem_object *bo =
 205                         msm_framebuffer_bo(fbdev->fb, 0);
 206                 msm_gem_put_vaddr(bo);
 207                 drm_framebuffer_remove(fbdev->fb);
 208         }
 209
 210         kfree(fbdev);
 211
 212         priv->fbdev = NULL;
 213 }