1 /*
2 * Copyright © 2014 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 #include "gem_ring.h"
25
26 #include <signal.h>
27 #include <sys/ioctl.h>
28 #include <sys/time.h>
29
30 #include "intel_reg.h"
31 #include "drmtest.h"
32 #include "ioctl_wrappers.h"
33 #include "igt_dummyload.h"
34 #include "igt_gt.h"
35
__execbuf(int fd,struct drm_i915_gem_execbuffer2 * execbuf)36 static int __execbuf(int fd, struct drm_i915_gem_execbuffer2 *execbuf)
37 {
38 int err;
39
40 err = 0;
41 if (ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, execbuf))
42 err = -errno;
43
44 errno = 0;
45 return err;
46 }
47
alarm_handler(int sig)48 static void alarm_handler(int sig)
49 {
50 }
51
52 static unsigned int
__gem_measure_ring_inflight(int fd,unsigned int engine,enum measure_ring_flags flags)53 __gem_measure_ring_inflight(int fd, unsigned int engine, enum measure_ring_flags flags)
54 {
55 struct sigaction old_sa, sa = { .sa_handler = alarm_handler };
56 struct drm_i915_gem_exec_object2 obj[2];
57 struct drm_i915_gem_execbuffer2 execbuf;
58 const uint32_t bbe = MI_BATCH_BUFFER_END;
59 unsigned int last[2]= { -1, -1 }, count;
60 struct itimerval itv;
61 IGT_CORK_HANDLE(cork);
62
63 memset(obj, 0, sizeof(obj));
64 obj[1].handle = gem_create(fd, 4096);
65 gem_write(fd, obj[1].handle, 0, &bbe, sizeof(bbe));
66
67 memset(&execbuf, 0, sizeof(execbuf));
68 execbuf.buffers_ptr = to_user_pointer(&obj[1]);
69 execbuf.buffer_count = 1;
70 execbuf.flags = engine;
71 gem_execbuf(fd, &execbuf);
72 gem_sync(fd, obj[1].handle);
73
74 obj[0].handle = igt_cork_plug(&cork, fd);
75
76 execbuf.buffers_ptr = to_user_pointer(obj);
77 execbuf.buffer_count = 2;
78
79 if (flags & MEASURE_RING_NEW_CTX)
80 execbuf.rsvd1 = gem_context_create(fd);
81
82 sigaction(SIGALRM, &sa, &old_sa);
83 itv.it_interval.tv_sec = 0;
84 itv.it_interval.tv_usec = 1000;
85 itv.it_value.tv_sec = 0;
86 itv.it_value.tv_usec = 10000;
87 setitimer(ITIMER_REAL, &itv, NULL);
88
89 count = 0;
90 do {
91 if (__execbuf(fd, &execbuf) == 0) {
92 count++;
93 continue;
94 }
95
96 if (last[1] == count)
97 break;
98
99 /* sleep until the next timer interrupt (woken on signal) */
100 pause();
101 last[1] = last[0];
102 last[0] = count;
103 } while (1);
104
105 igt_assert_eq(__execbuf(fd, &execbuf), -EINTR);
106 igt_assert(count > 1);
107
108 memset(&itv, 0, sizeof(itv));
109 setitimer(ITIMER_REAL, &itv, NULL);
110 sigaction(SIGALRM, &old_sa, NULL);
111
112 igt_cork_unplug(&cork);
113 gem_close(fd, obj[0].handle);
114 gem_close(fd, obj[1].handle);
115
116 if (flags & MEASURE_RING_NEW_CTX)
117 gem_context_destroy(fd, execbuf.rsvd1);
118
119 gem_quiescent_gpu(fd);
120
121 /* Be conservative in case we must wrap later */
122 return count - 1;
123 }
124
125 /**
126 * gem_measure_ring_inflight:
127 * @fd: open i915 drm file descriptor
128 * @engine: execbuf engine flag. Use macro ALL_ENGINES to get the minimum
129 * size across all physical engines.
130 * @flags: flags to affect measurement:
131 * - MEASURE_RING_NEW_CTX: use a new context to account for the space
132 * used by the lrc init.
133 *
134 * This function calculates the maximum number of batches that can be inserted
135 * at the same time in the ring on the selected engine.
136 *
137 * Returns:
138 * Number of batches that fit in the ring
139 */
140 unsigned int
gem_measure_ring_inflight(int fd,unsigned int engine,enum measure_ring_flags flags)141 gem_measure_ring_inflight(int fd, unsigned int engine, enum measure_ring_flags flags)
142 {
143 if (engine == ALL_ENGINES) {
144 unsigned int global_min = ~0u;
145
146 for_each_physical_engine(fd, engine) {
147 unsigned int engine_min = __gem_measure_ring_inflight(fd, engine, flags);
148
149 if (engine_min < global_min)
150 global_min = engine_min;
151 }
152
153 return global_min;
154 }
155
156 return __gem_measure_ring_inflight(fd, engine, flags);
157 }
158