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_framebuffer.h>
  12 #include <drm/drm_prime.h>
  13
  14 #include "msm_drv.h"
  15 #include "msm_gem.h"
  16 #include "msm_kms.h"
  17
  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
  52         return drm_gem_prime_mmap(bo, vma);
  53 }
  54
  55 static int msm_fbdev_create(struct drm_fb_helper *helper,
  56                 struct drm_fb_helper_surface_size *sizes)
  57 {
  58         struct msm_fbdev *fbdev = to_msm_fbdev(helper);
  59         struct drm_device *dev = helper->dev;
  60         struct msm_drm_private *priv = dev->dev_private;
  61         struct drm_framebuffer *fb = NULL;
  62         struct drm_gem_object *bo;
  63         struct fb_info *fbi = NULL;
  64         uint64_t paddr;
  65         uint32_t format;
  66         int ret, pitch;
  67
  68         format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
  69
  70         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
  71                         sizes->surface_height, sizes->surface_bpp,
  72                         sizes->fb_width, sizes->fb_height);
  73
  74         pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
  75         fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
  76                         sizes->surface_height, pitch, format);
  77
  78         if (IS_ERR(fb)) {
  79                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
  80                 return PTR_ERR(fb);
  81         }
  82
  83         bo = msm_framebuffer_bo(fb, 0);
  84
  85         /*
  86          * NOTE: if we can be guaranteed to be able to map buffer
  87          * in panic (ie. lock-safe, etc) we could avoid pinning the
  88          * buffer now:
  89          */
  90         ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
  91         if (ret) {
  92                 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
  93                 goto fail;
  94         }
  95
  96         fbi = drm_fb_helper_alloc_info(helper);
  97         if (IS_ERR(fbi)) {
  98                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
  99                 ret = PTR_ERR(fbi);
 100                 goto fail;
 101         }
 102
 103         DBG("fbi=%p, dev=%p", fbi, dev);
 104
 105         fbdev->fb = fb;
 106         helper->fb = fb;
 107
 108         fbi->fbops = &msm_fb_ops;
 109
 110         drm_fb_helper_fill_info(fbi, helper, sizes);
 111
 112         fbi->screen_base = msm_gem_get_vaddr(bo);
 113         if (IS_ERR(fbi->screen_base)) {
 114                 ret = PTR_ERR(fbi->screen_base);
 115                 goto fail;
 116         }
 117         fbi->screen_size = bo->size;
 118         fbi->fix.smem_start = paddr;
 119         fbi->fix.smem_len = bo->size;
 120
 121         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 122         DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
 123
 124         return 0;
 125
 126 fail:
 127         drm_framebuffer_remove(fb);
 128         return ret;
 129 }
 130
 131 static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
 132         .fb_probe = msm_fbdev_create,
 133 };
 134
 135 /* initialize fbdev helper */
 136 struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
 137 {
 138         struct msm_drm_private *priv = dev->dev_private;
 139         struct msm_fbdev *fbdev;
 140         struct drm_fb_helper *helper;
 141         int ret;
 142
 143         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 144         if (!fbdev)
 145                 return NULL;
 146
 147         helper = &fbdev->base;
 148
 149         drm_fb_helper_prepare(dev, helper, 32, &msm_fb_helper_funcs);
 150
 151         ret = drm_fb_helper_init(dev, helper);
 152         if (ret) {
 153                 DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
 154                 goto fail;
 155         }
 156
 157         /* the fw fb could be anywhere in memory */
 158         ret = drm_aperture_remove_framebuffers(false, dev->driver);
 159         if (ret)
 160                 goto fini;
 161
 162         ret = drm_fb_helper_initial_config(helper);
 163         if (ret)
 164                 goto fini;
 165
 166         priv->fbdev = helper;
 167
 168         return helper;
 169
 170 fini:
 171         drm_fb_helper_fini(helper);
 172 fail:
 173         drm_fb_helper_unprepare(helper);
 174         kfree(fbdev);
 175         return NULL;
 176 }
 177
 178 void msm_fbdev_free(struct drm_device *dev)
 179 {
 180         struct msm_drm_private *priv = dev->dev_private;
 181         struct drm_fb_helper *helper = priv->fbdev;
 182         struct msm_fbdev *fbdev;
 183
 184         DBG();
 185
 186         drm_fb_helper_unregister_info(helper);
 187
 188         drm_fb_helper_fini(helper);
 189
 190         fbdev = to_msm_fbdev(priv->fbdev);
 191
 192         /* this will free the backing object */
 193         if (fbdev->fb) {
 194                 struct drm_gem_object *bo =
 195                         msm_framebuffer_bo(fbdev->fb, 0);
 196                 msm_gem_put_vaddr(bo);
 197                 drm_framebuffer_remove(fbdev->fb);
 198         }
 199
 200         drm_fb_helper_unprepare(helper);
 201         kfree(fbdev);
 202
 203         priv->fbdev = NULL;
 204 }