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 <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
20static bool fbdev = true;
21MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer");
22module_param(fbdev, bool, 0600);
23
24/*
25 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
26 */
27
28FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev,
29 drm_fb_helper_damage_range,
30 drm_fb_helper_damage_area)
31
32static 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(fb: helper->fb, plane: 0);
36
37 return drm_gem_prime_mmap(obj: bo, vma);
38}
39
40static 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, plane: 0);
45
46 DBG();
47
48 drm_fb_helper_fini(helper);
49
50 /* this will free the backing object */
51 msm_gem_put_vaddr(obj: bo);
52 drm_framebuffer_remove(fb);
53
54 drm_client_release(client: &helper->client);
55 drm_fb_helper_unprepare(fb_helper: helper);
56 kfree(objp: helper);
57}
58
59static 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
68static 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
87static const struct drm_fb_helper_funcs msm_fbdev_helper_funcs = {
88 .fb_dirty = msm_fbdev_fb_dirty,
89};
90
91int 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(bpp: sizes->surface_bpp, depth: 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(width: sizes->surface_width, bpp: sizes->surface_bpp);
110 fb = msm_alloc_stolen_fb(dev, w: sizes->surface_width,
111 h: sizes->surface_height, p: pitch, format);
112
113 if (IS_ERR(ptr: fb)) {
114 DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
115 return PTR_ERR(ptr: fb);
116 }
117
118 bo = msm_framebuffer_bo(fb, plane: 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(obj: bo, aspace: priv->kms->aspace, iova: &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(fb_helper: helper);
132 if (IS_ERR(ptr: fbi)) {
133 DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
134 ret = PTR_ERR(ptr: 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(info: fbi, fb_helper: helper, sizes);
146
147 fbi->screen_buffer = msm_gem_get_vaddr(obj: bo);
148 if (IS_ERR(ptr: fbi->screen_buffer)) {
149 ret = PTR_ERR(ptr: 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
161fail:
162 drm_framebuffer_remove(fb);
163 return ret;
164}
165

source code of linux/drivers/gpu/drm/msm/msm_fbdev.c