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_aperture.h>
   8 #include <drm/drm_crtc.h>
   9 #include <drm/drm_fb_helper.h>
  10 #include <drm/drm_fourcc.h>
  11
  12 #include "msm_drv.h"
  13 #include "msm_gem.h"
  14 #include "msm_kms.h"
  15
  16 extern int msm_gem_mmap_obj(struct drm_gem_object *obj,
  17                                         struct vm_area_struct *vma);
  18 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
  19
  20 /*
  21  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  22  */
  23
  24 #define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
  25
  26 struct msm_fbdev {
  27         struct drm_fb_helper base;
  28         struct drm_framebuffer *fb;
  29 };
  30
  31 static const struct fb_ops msm_fb_ops = {
  32         .owner = THIS_MODULE,
  33         DRM_FB_HELPER_DEFAULT_OPS,
  34
  35         /* Note: to properly handle manual update displays, we wrap the
  36          * basic fbdev ops which write to the framebuffer
  37          */
  38         .fb_read = drm_fb_helper_sys_read,
  39         .fb_write = drm_fb_helper_sys_write,
  40         .fb_fillrect = drm_fb_helper_sys_fillrect,
  41         .fb_copyarea = drm_fb_helper_sys_copyarea,
  42         .fb_imageblit = drm_fb_helper_sys_imageblit,
  43         .fb_mmap = msm_fbdev_mmap,
  44 };
  45
  46 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
  47 {
  48         struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
  49         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  50         struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
  51         int ret = 0;
  52
  53         ret = drm_gem_mmap_obj(bo, bo->size, vma);
  54         if (ret) {
  55                 pr_err("%s:drm_gem_mmap_obj fail\n", __func__);
  56                 return ret;
  57         }
  58
  59         return msm_gem_mmap_obj(bo, vma);
  60 }
  61
  62 static int msm_fbdev_create(struct drm_fb_helper *helper,
  63                 struct drm_fb_helper_surface_size *sizes)
  64 {
  65         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  66         struct drm_device *dev = helper->dev;
  67         struct msm_drm_private *priv = dev->dev_private;
  68         struct drm_framebuffer *fb = NULL;
  69         struct drm_gem_object *bo;
  70         struct fb_info *fbi = NULL;
  71         uint64_t paddr;
  72         uint32_t format;
  73         int ret, pitch;
  74
  75         format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
  76
  77         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  78                         sizes->surface_height, sizes->surface_bpp,
  79                         sizes->fb_width, sizes->fb_height);
  80
  81         pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
  82         fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
  83                         sizes->surface_height, pitch, format);
  84
  85         if (IS_ERR(fb)) {
  86                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
  87                 return PTR_ERR(fb);
  88         }
  89
  90         bo = msm_framebuffer_bo(fb, 0);
  91
  92         mutex_lock(&dev->struct_mutex);
  93
  94         /*
  95          * NOTE: if we can be guaranteed to be able to map buffer
  96          * in panic (ie. lock-safe, etc) we could avoid pinning the
  97          * buffer now:
  98          */
  99         ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
 100         if (ret) {
 101                 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 102                 goto fail_unlock;
 103         }
 104
 105         fbi = drm_fb_helper_alloc_fbi(helper);
 106         if (IS_ERR(fbi)) {
 107                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
 108                 ret = PTR_ERR(fbi);
 109                 goto fail_unlock;
 110         }
 111
 112         DBG("fbi=%p, dev=%p", fbi, dev);
 113
 114         fbdev->fb = fb;
 115         helper->fb = fb;
 116
 117         fbi->fbops = &msm_fb_ops;
 118
 119         drm_fb_helper_fill_info(fbi, helper, sizes);
 120
 121         dev->mode_config.fb_base = paddr;
 122
 123         fbi->screen_base = msm_gem_get_vaddr(bo);
 124         if (IS_ERR(fbi->screen_base)) {
 125                 ret = PTR_ERR(fbi->screen_base);
 126                 goto fail_unlock;
 127         }
 128         fbi->screen_size = bo->size;
 129         fbi->fix.smem_start = paddr;
 130         fbi->fix.smem_len = bo->size;
 131
 132         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 133         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 134
 135         mutex_unlock(&dev->struct_mutex);
 136
 137         return 0;
 138
 139 fail_unlock:
 140         mutex_unlock(&dev->struct_mutex);
 141         drm_framebuffer_remove(fb);
 142         return ret;
 143 }
 144
 145 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 146         .fb_probe = msm_fbdev_create,
 147 };
 148
 149 /* initialize fbdev helper */
 150 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 151 {
 152         struct msm_drm_private *priv = dev->dev_private;
 153         struct msm_fbdev *fbdev = NULL;
 154         struct drm_fb_helper *helper;
 155         int ret;
 156
 157         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 158         if (!fbdev)
 159                 goto fail;
 160
 161         helper = &fbdev->base;
 162
 163         drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
 164
 165         ret = drm_fb_helper_init(dev, helper);
 166         if (ret) {
 167                 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
 168                 goto fail;
 169         }
 170
 171         /* the fw fb could be anywhere in memory */
 172         ret = drm_aperture_remove_framebuffers(false, "msm");
 173         if (ret)
 174                 goto fini;
 175
 176         ret = drm_fb_helper_initial_config(helper, 32);
 177         if (ret)
 178                 goto fini;
 179
 180         priv->fbdev = helper;
 181
 182         return helper;
 183
 184 fini:
 185         drm_fb_helper_fini(helper);
 186 fail:
 187         kfree(fbdev);
 188         return NULL;
 189 }
 190
 191 void msm_fbdev_free(struct drm_device *dev)
 192 {
 193         struct msm_drm_private *priv = dev->dev_private;
 194         struct drm_fb_helper *helper = priv->fbdev;
 195         struct msm_fbdev *fbdev;
 196
 197         DBG();
 198
 199         drm_fb_helper_unregister_fbi(helper);
 200
 201         drm_fb_helper_fini(helper);
 202
 203         fbdev = to_msm_fbdev(priv->fbdev);
 204
 205         /* this will free the backing object */
 206         if (fbdev->fb) {
 207                 struct drm_gem_object *bo =
 208                         msm_framebuffer_bo(fbdev->fb, 0);
 209                 msm_gem_put_vaddr(bo);
 210                 drm_framebuffer_remove(fbdev->fb);
 211         }
 212
 213         kfree(fbdev);
 214
 215         priv->fbdev = NULL;
 216 }