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1a02ea43 DV |
1 | /* |
2 | * Copyright (c) 2006-2008 Intel Corporation | |
3 | * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> | |
4 | * Copyright (c) 2008 Red Hat Inc. | |
5 | * Copyright (c) 2016 Intel Corporation | |
6 | * | |
7 | * Permission to use, copy, modify, distribute, and sell this software and its | |
8 | * documentation for any purpose is hereby granted without fee, provided that | |
9 | * the above copyright notice appear in all copies and that both that copyright | |
10 | * notice and this permission notice appear in supporting documentation, and | |
11 | * that the name of the copyright holders not be used in advertising or | |
12 | * publicity pertaining to distribution of the software without specific, | |
13 | * written prior permission. The copyright holders make no representations | |
14 | * about the suitability of this software for any purpose. It is provided "as | |
15 | * is" without express or implied warranty. | |
16 | * | |
17 | * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, | |
18 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO | |
19 | * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR | |
20 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, | |
21 | * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER | |
22 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE | |
23 | * OF THIS SOFTWARE. | |
24 | */ | |
25 | ||
0500c04e SR |
26 | #include <drm/drm_device.h> |
27 | #include <drm/drm_drv.h> | |
0be8d63a | 28 | #include <drm/drm_gem.h> |
0500c04e | 29 | #include <drm/drm_mode.h> |
1a02ea43 DV |
30 | |
31 | #include "drm_crtc_internal.h" | |
32 | ||
33 | /** | |
4f93624e | 34 | * DOC: overview |
1a02ea43 | 35 | * |
4f93624e DV |
36 | * The KMS API doesn't standardize backing storage object creation and leaves it |
37 | * to driver-specific ioctls. Furthermore actually creating a buffer object even | |
38 | * for GEM-based drivers is done through a driver-specific ioctl - GEM only has | |
39 | * a common userspace interface for sharing and destroying objects. While not an | |
40 | * issue for full-fledged graphics stacks that include device-specific userspace | |
41 | * components (in libdrm for instance), this limit makes DRM-based early boot | |
42 | * graphics unnecessarily complex. | |
1a02ea43 | 43 | * |
4f93624e DV |
44 | * Dumb objects partly alleviate the problem by providing a standard API to |
45 | * create dumb buffers suitable for scanout, which can then be used to create | |
46 | * KMS frame buffers. | |
1a02ea43 | 47 | * |
0be8d63a NT |
48 | * To support dumb objects drivers must implement the &drm_driver.dumb_create |
49 | * operation. &drm_driver.dumb_destroy defaults to drm_gem_dumb_destroy() if | |
50 | * not set and &drm_driver.dumb_map_offset defaults to | |
51 | * drm_gem_dumb_map_offset(). See the callbacks for further details. | |
1a02ea43 | 52 | * |
4f93624e DV |
53 | * Note that dumb objects may not be used for gpu acceleration, as has been |
54 | * attempted on some ARM embedded platforms. Such drivers really must have | |
55 | * a hardware-specific ioctl to allocate suitable buffer objects. | |
1a02ea43 | 56 | */ |
4f93624e | 57 | |
d30827ce NT |
58 | int drm_mode_create_dumb(struct drm_device *dev, |
59 | struct drm_mode_create_dumb *args, | |
60 | struct drm_file *file_priv) | |
1a02ea43 | 61 | { |
1a02ea43 DV |
62 | u32 cpp, stride, size; |
63 | ||
64 | if (!dev->driver->dumb_create) | |
65 | return -ENOSYS; | |
66 | if (!args->width || !args->height || !args->bpp) | |
67 | return -EINVAL; | |
68 | ||
69 | /* overflow checks for 32bit size calculations */ | |
2b620729 DC |
70 | if (args->bpp > U32_MAX - 8) |
71 | return -EINVAL; | |
1a02ea43 | 72 | cpp = DIV_ROUND_UP(args->bpp, 8); |
2b620729 | 73 | if (cpp > U32_MAX / args->width) |
1a02ea43 DV |
74 | return -EINVAL; |
75 | stride = cpp * args->width; | |
2b620729 | 76 | if (args->height > U32_MAX / stride) |
1a02ea43 DV |
77 | return -EINVAL; |
78 | ||
79 | /* test for wrap-around */ | |
80 | size = args->height * stride; | |
81 | if (PAGE_ALIGN(size) == 0) | |
82 | return -EINVAL; | |
83 | ||
84 | /* | |
85 | * handle, pitch and size are output parameters. Zero them out to | |
86 | * prevent drivers from accidentally using uninitialized data. Since | |
87 | * not all existing userspace is clearing these fields properly we | |
88 | * cannot reject IOCTL with garbage in them. | |
89 | */ | |
90 | args->handle = 0; | |
91 | args->pitch = 0; | |
92 | args->size = 0; | |
93 | ||
94 | return dev->driver->dumb_create(file_priv, dev, args); | |
95 | } | |
96 | ||
d30827ce NT |
97 | int drm_mode_create_dumb_ioctl(struct drm_device *dev, |
98 | void *data, struct drm_file *file_priv) | |
99 | { | |
100 | return drm_mode_create_dumb(dev, data, file_priv); | |
101 | } | |
102 | ||
1a02ea43 DV |
103 | /** |
104 | * drm_mode_mmap_dumb_ioctl - create an mmap offset for a dumb backing storage buffer | |
105 | * @dev: DRM device | |
106 | * @data: ioctl data | |
107 | * @file_priv: DRM file info | |
108 | * | |
109 | * Allocate an offset in the drm device node's address space to be able to | |
110 | * memory map a dumb buffer. | |
111 | * | |
112 | * Called by the user via ioctl. | |
113 | * | |
114 | * Returns: | |
115 | * Zero on success, negative errno on failure. | |
116 | */ | |
117 | int drm_mode_mmap_dumb_ioctl(struct drm_device *dev, | |
118 | void *data, struct drm_file *file_priv) | |
119 | { | |
120 | struct drm_mode_map_dumb *args = data; | |
121 | ||
0be8d63a | 122 | if (!dev->driver->dumb_create) |
1a02ea43 DV |
123 | return -ENOSYS; |
124 | ||
0be8d63a NT |
125 | if (dev->driver->dumb_map_offset) |
126 | return dev->driver->dumb_map_offset(file_priv, dev, | |
127 | args->handle, | |
128 | &args->offset); | |
129 | else | |
130 | return drm_gem_dumb_map_offset(file_priv, dev, args->handle, | |
131 | &args->offset); | |
1a02ea43 DV |
132 | } |
133 | ||
d30827ce NT |
134 | int drm_mode_destroy_dumb(struct drm_device *dev, u32 handle, |
135 | struct drm_file *file_priv) | |
1a02ea43 | 136 | { |
0be8d63a | 137 | if (!dev->driver->dumb_create) |
1a02ea43 DV |
138 | return -ENOSYS; |
139 | ||
0be8d63a | 140 | if (dev->driver->dumb_destroy) |
d30827ce | 141 | return dev->driver->dumb_destroy(file_priv, dev, handle); |
0be8d63a | 142 | else |
d30827ce | 143 | return drm_gem_dumb_destroy(file_priv, dev, handle); |
1a02ea43 DV |
144 | } |
145 | ||
d30827ce NT |
146 | int drm_mode_destroy_dumb_ioctl(struct drm_device *dev, |
147 | void *data, struct drm_file *file_priv) | |
148 | { | |
149 | struct drm_mode_destroy_dumb *args = data; | |
150 | ||
151 | return drm_mode_destroy_dumb(dev, args->handle, file_priv); | |
152 | } |