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
|
#include <cstring>
#include <cerrno>
#include <stdexcept>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <linux/dma-buf.h>
#include <kms++/kms++.h>
using namespace std;
namespace kms
{
DmabufFramebuffer::DmabufFramebuffer(Card& card, uint32_t width, uint32_t height, PixelFormat format,
vector<int> fds, vector<uint32_t> pitches, vector<uint32_t> offsets, vector<uint64_t> modifiers)
: Framebuffer(card, width, height)
{
int r;
m_format = format;
const PixelFormatInfo& format_info = get_pixel_format_info(format);
m_num_planes = format_info.num_planes;
if (fds.size() != m_num_planes || pitches.size() != m_num_planes || offsets.size() != m_num_planes)
throw std::invalid_argument("the size of fds, pitches and offsets has to match number of planes");
for (int i = 0; i < format_info.num_planes; ++i) {
FramebufferPlane& plane = m_planes.at(i);
plane.prime_fd = fds[i];
r = drmPrimeFDToHandle(card.fd(), fds[i], &plane.handle);
if (r)
throw invalid_argument(string("drmPrimeFDToHandle: ") + strerror(errno));
plane.stride = pitches[i];
plane.offset = offsets[i];
plane.modifier = modifiers.empty() ? 0 : modifiers[i];
plane.size = plane.stride * height;
plane.map = 0;
}
uint32_t id;
uint32_t bo_handles[4] = { m_planes[0].handle, m_planes[1].handle, m_planes[2].handle, m_planes[3].handle };
pitches.resize(4);
offsets.resize(4);
if (modifiers.empty()) {
r = drmModeAddFB2(card.fd(), width, height, (uint32_t)format,
bo_handles, pitches.data(), offsets.data(), &id, 0);
if (r)
throw invalid_argument(string("drmModeAddFB2 failed: ") + strerror(errno));
}
else {
modifiers.resize(4);
r = drmModeAddFB2WithModifiers(card.fd(), width, height, (uint32_t)format,
bo_handles, pitches.data(), offsets.data(), modifiers.data(), &id, DRM_MODE_FB_MODIFIERS);
if (r)
throw invalid_argument(string("drmModeAddFB2WithModifiers failed: ") + strerror(errno));
}
set_id(id);
}
DmabufFramebuffer::~DmabufFramebuffer()
{
drmModeRmFB(card().fd(), id());
}
uint8_t* DmabufFramebuffer::map(unsigned plane)
{
FramebufferPlane& p = m_planes.at(plane);
if (p.map)
return p.map;
p.map = (uint8_t *)mmap(0, p.size, PROT_READ | PROT_WRITE, MAP_SHARED,
p.prime_fd, 0);
if (p.map == MAP_FAILED)
throw invalid_argument(string("mmap failed: ") + strerror(errno));
return p.map;
}
int DmabufFramebuffer::prime_fd(unsigned plane)
{
FramebufferPlane& p = m_planes.at(plane);
return p.prime_fd;
}
void DmabufFramebuffer::begin_cpu_access(CpuAccess access)
{
if (m_sync_flags != 0)
throw runtime_error("begin_cpu sync already started");
switch (access) {
case CpuAccess::Read:
m_sync_flags = DMA_BUF_SYNC_READ;
break;
case CpuAccess::Write:
m_sync_flags = DMA_BUF_SYNC_WRITE;
break;
case CpuAccess::ReadWrite:
m_sync_flags = DMA_BUF_SYNC_RW;
break;
}
dma_buf_sync dbs {
.flags = DMA_BUF_SYNC_START | m_sync_flags
};
for (uint32_t p = 0; p < m_num_planes; ++p) {
int r = ioctl(prime_fd(p), DMA_BUF_IOCTL_SYNC, &dbs);
if (r)
throw runtime_error("DMA_BUF_IOCTL_SYNC failed");
}
}
void DmabufFramebuffer::end_cpu_access()
{
if (m_sync_flags == 0)
throw runtime_error("begin_cpu sync not started");
dma_buf_sync dbs {
.flags = DMA_BUF_SYNC_END | m_sync_flags
};
for (uint32_t p = 0; p < m_num_planes; ++p) {
int r = ioctl(prime_fd(p), DMA_BUF_IOCTL_SYNC, &dbs);
if (r)
throw runtime_error("DMA_BUF_IOCTL_SYNC failed");
}
m_sync_flags = 0;
}
}
|
