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 <[email protected]>
   5  */
   6
   7 #include <linux/fb.h>
   8
   9 #include <drm/drm_drv.h>
  10 #include <drm/drm_crtc_helper.h>
  11 #include <drm/drm_fb_helper.h>
  12 #include <drm/drm_fourcc.h>
  13 #include <drm/drm_framebuffer.h>
  14 #include <drm/drm_prime.h>
  15
  16 #include "msm_drv.h"
  17 #include "msm_gem.h"
  18 #include "msm_kms.h"
  19
  20 static bool fbdev = true;
  21 MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer");
  22 module_param(fbdev, bool, 0600);
  23
  24 /*
  25  * fbdev funcs, to implement legacy fbdev interface on top of drm driver
  26  */
  27
  28 FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev,
  29                                    drm_fb_helper_damage_range,
  30                                    drm_fb_helper_damage_area)
  31
  32 static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
  33 {
  34         struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
  35         struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0);
  36
  37         return drm_gem_prime_mmap(bo, vma);
  38 }
  39
  40 static void msm_fbdev_fb_destroy(struct fb_info *info)
  41 {
  42         struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
  43         struct drm_framebuffer *fb = helper->fb;
  44         struct drm_gem_object *bo = msm_framebuffer_bo(fb, 0);
  45
  46         DBG();
  47
  48         drm_fb_helper_fini(helper);
  49
  50         /* this will free the backing object */
  51         msm_gem_put_vaddr(bo);
  52         drm_framebuffer_remove(fb);
  53
  54         drm_client_release(&helper->client);
  55         drm_fb_helper_unprepare(helper);
  56         kfree(helper);
  57 }
  58
  59 static const struct fb_ops msm_fb_ops = {
  60         .owner = THIS_MODULE,
  61         __FB_DEFAULT_DEFERRED_OPS_RDWR(msm_fbdev),
  62         DRM_FB_HELPER_DEFAULT_OPS,
  63         __FB_DEFAULT_DEFERRED_OPS_DRAW(msm_fbdev),
  64         .fb_mmap = msm_fbdev_mmap,
  65         .fb_destroy = msm_fbdev_fb_destroy,
  66 };
  67
  68 static int msm_fbdev_fb_dirty(struct drm_fb_helper *helper,
  69                               struct drm_clip_rect *clip)
  70 {
  71         struct drm_device *dev = helper->dev;
  72         int ret;
  73
  74         /* Call damage handlers only if necessary */
  75         if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
  76                 return 0;
  77
  78         if (helper->fb->funcs->dirty) {
  79                 ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
  80                 if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))
  81                         return ret;
  82         }
  83
  84         return 0;
  85 }
  86
  87 static const struct drm_fb_helper_funcs msm_fbdev_helper_funcs = {
  88         .fb_dirty = msm_fbdev_fb_dirty,
  89 };
  90
  91 int msm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
  92                                  struct drm_fb_helper_surface_size *sizes)
  93 {
  94         struct drm_device *dev = helper->dev;
  95         struct msm_drm_private *priv = dev->dev_private;
  96         struct drm_framebuffer *fb = NULL;
  97         struct drm_gem_object *bo;
  98         struct fb_info *fbi = NULL;
  99         uint64_t paddr;
 100         uint32_t format;
 101         int ret, pitch;
 102
 103         format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
 104
 105         DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
 106                         sizes->surface_height, sizes->surface_bpp,
 107                         sizes->fb_width, sizes->fb_height);
 108
 109         pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
 110         fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
 111                         sizes->surface_height, pitch, format);
 112
 113         if (IS_ERR(fb)) {
 114                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
 115                 return PTR_ERR(fb);
 116         }
 117
 118         bo = msm_framebuffer_bo(fb, 0);
 119
 120         /*
 121          * NOTE: if we can be guaranteed to be able to map buffer
 122          * in panic (ie. lock-safe, etc) we could avoid pinning the
 123          * buffer now:
 124          */
 125         ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
 126         if (ret) {
 127                 DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
 128                 goto fail;
 129         }
 130
 131         fbi = drm_fb_helper_alloc_info(helper);
 132         if (IS_ERR(fbi)) {
 133                 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
 134                 ret = PTR_ERR(fbi);
 135                 goto fail;
 136         }
 137
 138         DBG("fbi=%p, dev=%p", fbi, dev);
 139
 140         helper->funcs = &msm_fbdev_helper_funcs;
 141         helper->fb = fb;
 142
 143         fbi->fbops = &msm_fb_ops;
 144
 145         drm_fb_helper_fill_info(fbi, helper, sizes);
 146
 147         fbi->screen_buffer = msm_gem_get_vaddr(bo);
 148         if (IS_ERR(fbi->screen_buffer)) {
 149                 ret = PTR_ERR(fbi->screen_buffer);
 150                 goto fail;
 151         }
 152         fbi->screen_size = bo->size;
 153         fbi->fix.smem_start = paddr;
 154         fbi->fix.smem_len = bo->size;
 155
 156         DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
 157         DBG("allocated %dx%d fb", fb->width, fb->height);
 158
 159         return 0;
 160
 161 fail:
 162         drm_framebuffer_remove(fb);
 163         return ret;
 164 }