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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
#define _PCILIB_DMA_IPE_C
#define _BSD_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sched.h>
#include <sys/time.h>
#include <arpa/inet.h>
#include "pci.h"
#include "pcilib.h"
#include "error.h"
#include "tools.h"
#include "debug.h"
#include "ipe.h"
#include "ipe_private.h"
typedef struct {
size_t size;
size_t pos;
pcilib_dma_flags_t flags;
} dma_ipe_skim_callback_context_t;
static int dma_ipe_skim_callback(void *arg, pcilib_dma_flags_t flags, size_t bufsize, void *buf) {
dma_ipe_skim_callback_context_t *ctx = (dma_ipe_skim_callback_context_t*)arg;
ctx->pos += bufsize;
if (flags & PCILIB_DMA_FLAG_EOP) {
if ((ctx->pos < ctx->size)&&(ctx->flags&PCILIB_DMA_FLAG_MULTIPACKET)) {
if (ctx->flags&PCILIB_DMA_FLAG_WAIT) return PCILIB_STREAMING_WAIT;
else return PCILIB_STREAMING_CONTINUE;
}
return PCILIB_STREAMING_STOP;
}
return PCILIB_STREAMING_REQ_FRAGMENT;
}
int dma_ipe_skim_dma_custom(pcilib_t *ctx, pcilib_dma_engine_t dma, uintptr_t addr, size_t size, pcilib_dma_flags_t flags, pcilib_timeout_t timeout, void *buf, size_t *read_bytes) {
int err;
dma_ipe_skim_callback_context_t opts = {
size, 0, flags
};
err = pcilib_stream_dma(ctx, dma, addr, size, flags, timeout, dma_ipe_skim_callback, &opts);
if (read_bytes) *read_bytes = opts.pos;
return err;
}
double dma_ipe_benchmark(pcilib_dma_context_t *vctx, pcilib_dma_engine_addr_t dma, uintptr_t addr, size_t size, size_t iterations, pcilib_dma_direction_t direction) {
int err = 0;
ipe_dma_t *ctx = (ipe_dma_t*)vctx;
int iter;
size_t us = 0;
struct timeval start, cur;
void *buf;
size_t bytes, rbytes;
int (*read_dma)(pcilib_t *ctx, pcilib_dma_engine_t dma, uintptr_t addr, size_t size, pcilib_dma_flags_t flags, pcilib_timeout_t timeout, void *buf, size_t *read_bytes);
if ((direction == PCILIB_DMA_TO_DEVICE)||(direction == PCILIB_DMA_BIDIRECTIONAL)) return -1.;
if ((dma != PCILIB_DMA_ENGINE_INVALID)&&(dma > 1)) return -1.;
if (size%IPEDMA_PAGE_SIZE) size = (1 + size / IPEDMA_PAGE_SIZE) * IPEDMA_PAGE_SIZE;
err = dma_ipe_start(vctx, 0, PCILIB_DMA_FLAGS_DEFAULT);
if (err) return err;
if (getenv("PCILIB_BENCHMARK_HARDWARE"))
read_dma = dma_ipe_skim_dma_custom;
else
read_dma = pcilib_read_dma_custom;
// There is no significant difference and we can remove this when testing phase is over.
if (getenv("PCILIB_BENCHMARK_STREAMING")) {
size_t dma_buffer_space;
pcilib_dma_engine_status_t dma_status;
if (read_dma == pcilib_read_dma_custom)
pcilib_info_once("Benchmarking the DMA streaming (with memcpy)");
else
pcilib_info_once("Benchmarking the DMA streaming (without memcpy)");
// Starting DMA
WR(IPEDMA_REG_CONTROL, 0x1);
gettimeofday(&start, NULL);
pcilib_calc_deadline(&start, IPEDMA_DMA_TIMEOUT * IPEDMA_DMA_PAGES);
#ifdef IPEDMA_BUG_LAST_READ
dma_buffer_space = (IPEDMA_DMA_PAGES - 2) * IPEDMA_PAGE_SIZE;
#else /* IPEDMA_BUG_LAST_READ */
dma_buffer_space = (IPEDMA_DMA_PAGES - 1) * IPEDMA_PAGE_SIZE;
#endif /* IPEDMA_BUG_LAST_READ */
// Allocate memory and prepare data
buf = malloc(size + dma_buffer_space);
if (!buf) return -1;
// Wait all DMA buffers are filled
memset(&dma_status, 0, sizeof(dma_status));
do {
usleep(10 * IPEDMA_NODATA_SLEEP);
err = dma_ipe_get_status(vctx, dma, &dma_status, 0, NULL);
} while ((!err)&&(dma_status.written_bytes < dma_buffer_space)&&(pcilib_calc_time_to_deadline(&start) > 0));
if (err) {
pcilib_error("Error (%i) getting dma status", err);
return -1;
} else if (dma_status.written_bytes < dma_buffer_space) {
pcilib_error("Timeout while waiting DMA engine to feel the buffer space completely, only %zu bytes of %zu written", dma_status.written_bytes, dma_buffer_space);
return -1;
}
gettimeofday(&start, NULL);
for (iter = 0; iter < iterations; iter++) {
for (bytes = 0; bytes < (size + dma_buffer_space); bytes += rbytes) {
err = read_dma(ctx->dmactx.pcilib, 0, addr, size + dma_buffer_space - bytes, PCILIB_DMA_FLAG_MULTIPACKET, PCILIB_DMA_TIMEOUT, buf + bytes, &rbytes);
if (err) {
pcilib_error("Can't read data from DMA, error %i", err);
return -1;
}
}
dma_buffer_space = 0;
}
gettimeofday(&cur, NULL);
us += ((cur.tv_sec - start.tv_sec)*1000000 + (cur.tv_usec - start.tv_usec));
// Stopping DMA
WR(IPEDMA_REG_CONTROL, 0x0);
pcilib_skip_dma(ctx->dmactx.pcilib, 0);
} else {
if (read_dma == dma_ipe_skim_dma_custom)
pcilib_info_once("Benchmarking the DMA hardware (without memcpy)");
WR(IPEDMA_REG_CONTROL, 0x0);
/*
err = pcilib_skip_dma(ctx->dmactx.pcilib, 0);
if (err) {
pcilib_error("Can't start benchmark, devices continuously writes unexpected data using DMA engine");
return -1;
}
*/
// Allocate memory and prepare data
buf = malloc(size);
if (!buf) return -1;
for (iter = 0; iter < iterations; iter++) {
gettimeofday(&start, NULL);
// Starting DMA
WR(IPEDMA_REG_CONTROL, 0x1);
for (bytes = 0; bytes < size; bytes += rbytes) {
err = read_dma(ctx->dmactx.pcilib, 0, addr, size - bytes, PCILIB_DMA_FLAG_MULTIPACKET, PCILIB_DMA_TIMEOUT, buf + bytes, &rbytes);
if (err) {
pcilib_error("Can't read data from DMA, error %i", err);
return -1;
}
}
// Stopping DMA
WR(IPEDMA_REG_CONTROL, 0x0);
if (err) break;
gettimeofday(&cur, NULL);
us += ((cur.tv_sec - start.tv_sec)*1000000 + (cur.tv_usec - start.tv_usec));
/*
err = pcilib_skip_dma(ctx->dmactx.pcilib, 0);
if (err) {
pcilib_error("Can't start iteration, devices continuously writes unexpected data using DMA engine");
break;
}
*/
}
}
free(buf);
return err?-1:((1. * size * iterations * 1000000) / (1024. * 1024. * us));
}
|
