1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <wlr/interfaces/wlr_buffer.h>
#include <wlr/render/allocator.h>
#include <wlr/util/log.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "backend/backend.h"
#include "render/allocator/allocator.h"
#include "render/allocator/drm_dumb.h"
#include "render/allocator/gbm.h"
#include "render/allocator/shm.h"
#include "render/wlr_renderer.h"
void wlr_allocator_init(struct wlr_allocator *alloc,
const struct wlr_allocator_interface *impl, uint32_t buffer_caps) {
assert(impl && impl->destroy && impl->create_buffer);
alloc->impl = impl;
alloc->buffer_caps = buffer_caps;
wl_signal_init(&alloc->events.destroy);
}
/* Re-open the DRM node to avoid GEM handle ref'counting issues. See:
* https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/110
*/
static int reopen_drm_node(int drm_fd, bool allow_render_node) {
if (drmIsMaster(drm_fd)) {
// Only recent kernels support empty leases
uint32_t lessee_id;
int lease_fd = drmModeCreateLease(drm_fd, NULL, 0, O_CLOEXEC, &lessee_id);
if (lease_fd >= 0) {
return lease_fd;
} else if (lease_fd != -EINVAL && lease_fd != -EOPNOTSUPP) {
wlr_log_errno(WLR_ERROR, "drmModeCreateLease failed");
return -1;
}
wlr_log(WLR_DEBUG, "drmModeCreateLease failed, "
"falling back to plain open");
}
char *name = NULL;
if (allow_render_node) {
name = drmGetRenderDeviceNameFromFd(drm_fd);
}
if (name == NULL) {
// Either the DRM device has no render node, either the caller wants
// a primary node
name = drmGetDeviceNameFromFd2(drm_fd);
if (name == NULL) {
wlr_log(WLR_ERROR, "drmGetDeviceNameFromFd2 failed");
return -1;
}
}
int new_fd = open(name, O_RDWR | O_CLOEXEC);
if (new_fd < 0) {
wlr_log_errno(WLR_ERROR, "Failed to open DRM node '%s'", name);
free(name);
return -1;
}
free(name);
// If we're using a DRM primary node (e.g. because we're running under the
// DRM backend, or because we're on split render/display machine), we need
// to use the legacy DRM authentication mechanism to have the permission to
// manipulate buffers.
if (drmGetNodeTypeFromFd(new_fd) == DRM_NODE_PRIMARY) {
drm_magic_t magic;
if (drmGetMagic(new_fd, &magic) < 0) {
wlr_log_errno(WLR_ERROR, "drmGetMagic failed");
close(new_fd);
return -1;
}
if (drmAuthMagic(drm_fd, magic) < 0) {
wlr_log_errno(WLR_ERROR, "drmAuthMagic failed");
close(new_fd);
return -1;
}
}
return new_fd;
}
struct wlr_allocator *allocator_autocreate_with_drm_fd(
struct wlr_backend *backend, struct wlr_renderer *renderer,
int drm_fd) {
uint32_t backend_caps = backend_get_buffer_caps(backend);
uint32_t renderer_caps = renderer_get_render_buffer_caps(renderer);
struct wlr_allocator *alloc = NULL;
uint32_t gbm_caps = WLR_BUFFER_CAP_DMABUF;
if ((backend_caps & gbm_caps) && (renderer_caps & gbm_caps)
&& drm_fd >= 0) {
wlr_log(WLR_DEBUG, "Trying to create gbm allocator");
int gbm_fd = reopen_drm_node(drm_fd, true);
if (gbm_fd < 0) {
return NULL;
}
if ((alloc = wlr_gbm_allocator_create(gbm_fd)) != NULL) {
return alloc;
}
close(gbm_fd);
wlr_log(WLR_DEBUG, "Failed to create gbm allocator");
}
uint32_t shm_caps = WLR_BUFFER_CAP_SHM | WLR_BUFFER_CAP_DATA_PTR;
if ((backend_caps & shm_caps) && (renderer_caps & shm_caps)) {
wlr_log(WLR_DEBUG, "Trying to create shm allocator");
if ((alloc = wlr_shm_allocator_create()) != NULL) {
return alloc;
}
wlr_log(WLR_DEBUG, "Failed to create shm allocator");
}
uint32_t drm_caps = WLR_BUFFER_CAP_DMABUF | WLR_BUFFER_CAP_DATA_PTR;
if ((backend_caps & drm_caps) && (renderer_caps & drm_caps)
&& drm_fd >= 0 && drmIsMaster(drm_fd)) {
wlr_log(WLR_DEBUG, "Trying to create drm dumb allocator");
int dumb_fd = reopen_drm_node(drm_fd, false);
if (dumb_fd < 0) {
return NULL;
}
if ((alloc = wlr_drm_dumb_allocator_create(dumb_fd)) != NULL) {
return alloc;
}
close(dumb_fd);
wlr_log(WLR_DEBUG, "Failed to create drm dumb allocator");
}
wlr_log(WLR_ERROR, "Failed to create allocator");
return NULL;
}
struct wlr_allocator *wlr_allocator_autocreate(struct wlr_backend *backend,
struct wlr_renderer *renderer) {
// Note, drm_fd may be negative if unavailable
int drm_fd = wlr_backend_get_drm_fd(backend);
if (drm_fd < 0) {
drm_fd = wlr_renderer_get_drm_fd(renderer);
}
return allocator_autocreate_with_drm_fd(backend, renderer, drm_fd);
}
void wlr_allocator_destroy(struct wlr_allocator *alloc) {
if (alloc == NULL) {
return;
}
wl_signal_emit(&alloc->events.destroy, NULL);
alloc->impl->destroy(alloc);
}
struct wlr_buffer *wlr_allocator_create_buffer(struct wlr_allocator *alloc,
int width, int height, const struct wlr_drm_format *format) {
struct wlr_buffer *buffer =
alloc->impl->create_buffer(alloc, width, height, format);
if (buffer == NULL) {
return NULL;
}
if (alloc->buffer_caps & WLR_BUFFER_CAP_DATA_PTR) {
assert(buffer->impl->begin_data_ptr_access &&
buffer->impl->end_data_ptr_access);
}
if (alloc->buffer_caps & WLR_BUFFER_CAP_DMABUF) {
assert(buffer->impl->get_dmabuf);
}
if (alloc->buffer_caps & WLR_BUFFER_CAP_SHM) {
assert(buffer->impl->get_shm);
}
return buffer;
}
|
