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192 lines · 5.2 KiB

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_file.h>
13#include <drm/drm_fourcc.h>
14#include <drm/drm_framebuffer.h>
15#include <drm/drm_prime.h>
16
17#include "msm_drv.h"
18#include "msm_gem.h"
19#include "msm_kms.h"
20
21static bool fbdev = true;
22MODULE_PARM_DESC(fbdev, "Enable fbdev compat layer");
23module_param(fbdev, bool, 0600);
24
25/*
26 * fbdev funcs, to implement legacy fbdev interface on top of drm driver
27 */
28
29FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(msm_fbdev,
30 drm_fb_helper_damage_range,
31 drm_fb_helper_damage_area)
32
33static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
34{
35 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
36 struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0);
37
38 return drm_gem_prime_mmap(bo, vma);
39}
40
41static void msm_fbdev_fb_destroy(struct fb_info *info)
42{
43 struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
44 struct drm_gem_object *bo = msm_framebuffer_bo(helper->fb, 0);
45
46 DBG();
47
48 drm_fb_helper_fini(helper);
49
50 msm_gem_put_vaddr(bo);
51
52 drm_client_buffer_delete(helper->buffer);
53 drm_client_release(&helper->client);
54}
55
56static const struct fb_ops msm_fb_ops = {
57 .owner = THIS_MODULE,
58 __FB_DEFAULT_DEFERRED_OPS_RDWR(msm_fbdev),
59 DRM_FB_HELPER_DEFAULT_OPS,
60 __FB_DEFAULT_DEFERRED_OPS_DRAW(msm_fbdev),
61 .fb_mmap = msm_fbdev_mmap,
62 .fb_destroy = msm_fbdev_fb_destroy,
63};
64
65static int msm_fbdev_fb_dirty(struct drm_fb_helper *helper,
66 struct drm_clip_rect *clip)
67{
68 struct drm_device *dev = helper->dev;
69 int ret;
70
71 /* Call damage handlers only if necessary */
72 if (!(clip->x1 < clip->x2 && clip->y1 < clip->y2))
73 return 0;
74
75 if (helper->fb->funcs->dirty) {
76 ret = helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, clip, 1);
77 if (drm_WARN_ONCE(dev, ret, "Dirty helper failed: ret=%d\n", ret))
78 return ret;
79 }
80
81 return 0;
82}
83
84static const struct drm_fb_helper_funcs msm_fbdev_helper_funcs = {
85 .fb_dirty = msm_fbdev_fb_dirty,
86};
87
88int msm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
89 struct drm_fb_helper_surface_size *sizes)
90{
91 struct drm_client_dev *client = &helper->client;
92 struct drm_device *dev = client->dev;
93 struct drm_file *file = client->file;
94 struct msm_drm_private *priv = dev->dev_private;
95 struct fb_info *fbi = helper->info;
96 const struct drm_format_info *format;
97 u32 fourcc, pitch, handle;
98 u64 size;
99 struct drm_gem_object *bo;
100 struct drm_client_buffer *buffer;
101 uint64_t paddr;
102 int ret;
103
104 DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
105 sizes->surface_height, sizes->surface_bpp,
106 sizes->fb_width, sizes->fb_height);
107
108 fourcc = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
109 format = drm_get_format_info(dev, fourcc, DRM_FORMAT_MOD_LINEAR);
110 /* adreno needs pitch aligned to 32 pixels: */
111 pitch = drm_format_info_min_pitch(format, 0, ALIGN(sizes->surface_width, 32));
112 size = ALIGN(pitch * sizes->surface_height, PAGE_SIZE);
113
114 /* allocate backing bo */
115 DBG("allocating %llu bytes for fb %d", size, dev->primary->index);
116 bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC | MSM_BO_STOLEN, NULL);
117 if (IS_ERR(bo)) {
118 drm_warn(dev, "could not allocate stolen bo\n");
119 /* try regular bo: */
120 bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | MSM_BO_WC, NULL);
121 if (IS_ERR(bo)) {
122 drm_err(dev, "failed to allocate buffer object\n");
123 return PTR_ERR(bo);
124 }
125 }
126
127 msm_gem_object_set_name(bo, "stolenfb");
128
129 ret = drm_gem_handle_create(file, bo, &handle);
130 if (ret)
131 goto err_drm_gem_object_put;
132
133 buffer = drm_client_buffer_create(client, sizes->surface_width, sizes->surface_height,
134 fourcc, handle, pitch);
135 if (IS_ERR(buffer)) {
136 ret = PTR_ERR(buffer);
137 goto err_drm_gem_handle_delete;
138 }
139
140 /*
141 * NOTE: if we can be guaranteed to be able to map buffer
142 * in panic (ie. lock-safe, etc) we could avoid pinning the
143 * buffer now:
144 */
145 ret = msm_gem_get_and_pin_iova(bo, priv->kms->vm, &paddr);
146 if (ret) {
147 drm_err(dev, "failed to get buffer obj iova: %d\n", ret);
148 goto err_drm_client_buffer_delete;
149 }
150
151 DBG("fbi=%p, dev=%p", fbi, dev);
152
153 helper->funcs = &msm_fbdev_helper_funcs;
154 helper->buffer = buffer;
155 helper->fb = buffer->fb;
156
157 fbi->fbops = &msm_fb_ops;
158 fbi->flags |= FBINFO_VIRTFB; /* system memory */
159
160 drm_fb_helper_fill_info(fbi, helper, sizes);
161
162 fbi->screen_buffer = msm_gem_get_vaddr(bo);
163 if (IS_ERR(fbi->screen_buffer)) {
164 ret = PTR_ERR(fbi->screen_buffer);
165 goto err_msm_gem_unpin;
166 }
167 fbi->screen_size = bo->size;
168 fbi->fix.smem_start = paddr;
169 fbi->fix.smem_len = bo->size;
170
171 DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
172 DBG("allocated %dx%d fb", buffer->fb->width, buffer->fb->height);
173
174 /* The handle is only needed for creating the framebuffer. */
175 drm_gem_handle_delete(file, handle);
176
177 /* The framebuffer still holds a reference on the GEM object. */
178 drm_gem_object_put(bo);
179
180 return 0;
181
182err_msm_gem_unpin:
183 msm_gem_unpin_iova(bo, priv->kms->vm);
184 msm_gem_vma_put(bo);
185err_drm_client_buffer_delete:
186 drm_client_buffer_delete(buffer);
187err_drm_gem_handle_delete:
188 drm_gem_handle_delete(file, handle);
189err_drm_gem_object_put:
190 drm_gem_object_put(bo);
191 return ret;
192}