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 #include <drm/drm_prime.h>
  12
  13 #include "msm_drv.h"
  14 #include "msm_gem.h"
  15 #include "msm_kms.h"
  16
  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
  51         return drm_gem_prime_mmap(bo, vma);
  52 }
  53
  54 static int msm_fbdev_create(struct drm_fb_helper *helper,
  55                 struct drm_fb_helper_surface_size *sizes)
  56 {
  57         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  58         struct drm_device *dev = helper->dev;
  59         struct msm_drm_private *priv = dev->dev_private;
  60         struct drm_framebuffer *fb = NULL;
  61         struct drm_gem_object *bo;
  62         struct fb_info *fbi = NULL;
  63         uint64_t paddr;
  64         uint32_t format;
  65         int ret, pitch;
  66
  67         format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
  68
  69         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  70                         sizes->surface_height, sizes->surface_bpp,
  71                         sizes->fb_width, sizes->fb_height);
  72
  73         pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
  74         fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
  75                         sizes->surface_height, pitch, format);
  76
  77         if (IS_ERR(fb)) {
  78                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
  79                 return PTR_ERR(fb);
  80         }
  81
  82         bo = msm_framebuffer_bo(fb, 0);
  83
  84         mutex_lock(&dev->struct_mutex);
  85
  86         /*
  87          * NOTE: if we can be guaranteed to be able to map buffer
  88          * in panic (ie. lock-safe, etc) we could avoid pinning the
  89          * buffer now:
  90          */
  91         ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
  92         if (ret) {
  93                 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
  94                 goto fail_unlock;
  95         }
  96
  97         fbi = drm_fb_helper_alloc_fbi(helper);
  98         if (IS_ERR(fbi)) {
  99                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
 100                 ret = PTR_ERR(fbi);
 101                 goto fail_unlock;
 102         }
 103
 104         DBG("fbi=%p, dev=%p", fbi, dev);
 105
 106         fbdev->fb = fb;
 107         helper->fb = fb;
 108
 109         fbi->fbops = &msm_fb_ops;
 110
 111         drm_fb_helper_fill_info(fbi, helper, sizes);
 112
 113         dev->mode_config.fb_base = paddr;
 114
 115         fbi->screen_base = msm_gem_get_vaddr(bo);
 116         if (IS_ERR(fbi->screen_base)) {
 117                 ret = PTR_ERR(fbi->screen_base);
 118                 goto fail_unlock;
 119         }
 120         fbi->screen_size = bo->size;
 121         fbi->fix.smem_start = paddr;
 122         fbi->fix.smem_len = bo->size;
 123
 124         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 125         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 126
 127         mutex_unlock(&dev->struct_mutex);
 128
 129         return 0;
 130
 131 fail_unlock:
 132         mutex_unlock(&dev->struct_mutex);
 133         drm_framebuffer_remove(fb);
 134         return ret;
 135 }
 136
 137 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 138         .fb_probe = msm_fbdev_create,
 139 };
 140
 141 /* initialize fbdev helper */
 142 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 143 {
 144         struct msm_drm_private *priv = dev->dev_private;
 145         struct msm_fbdev *fbdev = NULL;
 146         struct drm_fb_helper *helper;
 147         int ret;
 148
 149         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 150         if (!fbdev)
 151                 goto fail;
 152
 153         helper = &fbdev->base;
 154
 155         drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
 156
 157         ret = drm_fb_helper_init(dev, helper);
 158         if (ret) {
 159                 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
 160                 goto fail;
 161         }
 162
 163         /* the fw fb could be anywhere in memory */
 164         ret = drm_aperture_remove_framebuffers(false, dev->driver);
 165         if (ret)
 166                 goto fini;
 167
 168         ret = drm_fb_helper_initial_config(helper, 32);
 169         if (ret)
 170                 goto fini;
 171
 172         priv->fbdev = helper;
 173
 174         return helper;
 175
 176 fini:
 177         drm_fb_helper_fini(helper);
 178 fail:
 179         kfree(fbdev);
 180         return NULL;
 181 }
 182
 183 void msm_fbdev_free(struct drm_device *dev)
 184 {
 185         struct msm_drm_private *priv = dev->dev_private;
 186         struct drm_fb_helper *helper = priv->fbdev;
 187         struct msm_fbdev *fbdev;
 188
 189         DBG();
 190
 191         drm_fb_helper_unregister_fbi(helper);
 192
 193         drm_fb_helper_fini(helper);
 194
 195         fbdev = to_msm_fbdev(priv->fbdev);
 196
 197         /* this will free the backing object */
 198         if (fbdev->fb) {
 199                 struct drm_gem_object *bo =
 200                         msm_framebuffer_bo(fbdev->fb, 0);
 201                 msm_gem_put_vaddr(bo);
 202                 drm_framebuffer_remove(fbdev->fb);
 203         }
 204
 205         kfree(fbdev);
 206
 207         priv->fbdev = NULL;
 208 }