diff options
Diffstat (limited to 'include/os/linux/timers.c')
-rw-r--r-- | include/os/linux/timers.c | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/include/os/linux/timers.c b/include/os/linux/timers.c new file mode 100644 index 0000000..018fd2d --- /dev/null +++ b/include/os/linux/timers.c | |||
@@ -0,0 +1,269 @@ | |||
1 | /* | ||
2 | * Copyright (c) 2016-2018, NVIDIA CORPORATION. All rights reserved. | ||
3 | * | ||
4 | * This program is free software; you can redistribute it and/or modify it | ||
5 | * under the terms and conditions of the GNU General Public License, | ||
6 | * version 2, as published by the Free Software Foundation. | ||
7 | * | ||
8 | * This program is distributed in the hope it will be useful, but WITHOUT | ||
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | ||
11 | * more details. | ||
12 | * | ||
13 | * You should have received a copy of the GNU General Public License | ||
14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
15 | */ | ||
16 | |||
17 | #include <linux/ktime.h> | ||
18 | #include <linux/delay.h> | ||
19 | |||
20 | #include <nvgpu/timers.h> | ||
21 | #include <nvgpu/soc.h> | ||
22 | #include <nvgpu/gk20a.h> | ||
23 | |||
24 | #include "platform_gk20a.h" | ||
25 | |||
26 | /* | ||
27 | * Returns 1 if the platform is pre-Si and should ignore the timeout checking. | ||
28 | * Setting %NVGPU_TIMER_NO_PRE_SI will make this always return 0 (i.e do the | ||
29 | * timeout check regardless of platform). | ||
30 | */ | ||
31 | static int nvgpu_timeout_is_pre_silicon(struct nvgpu_timeout *timeout) | ||
32 | { | ||
33 | if (timeout->flags & NVGPU_TIMER_NO_PRE_SI) | ||
34 | return 0; | ||
35 | |||
36 | return !nvgpu_platform_is_silicon(timeout->g); | ||
37 | } | ||
38 | |||
39 | /** | ||
40 | * nvgpu_timeout_init - Init timer. | ||
41 | * | ||
42 | * @g - nvgpu device. | ||
43 | * @timeout - The timer. | ||
44 | * @duration - Timeout in milliseconds or number of retries. | ||
45 | * @flags - Flags for timer. | ||
46 | * | ||
47 | * This configures the timeout to start the timeout duration now, i.e: when this | ||
48 | * function is called. Available flags to pass to @flags: | ||
49 | * | ||
50 | * %NVGPU_TIMER_CPU_TIMER | ||
51 | * %NVGPU_TIMER_RETRY_TIMER | ||
52 | * %NVGPU_TIMER_NO_PRE_SI | ||
53 | * %NVGPU_TIMER_SILENT_TIMEOUT | ||
54 | * | ||
55 | * If neither %NVGPU_TIMER_CPU_TIMER or %NVGPU_TIMER_RETRY_TIMER is passed then | ||
56 | * a CPU timer is used by default. | ||
57 | */ | ||
58 | int nvgpu_timeout_init(struct gk20a *g, struct nvgpu_timeout *timeout, | ||
59 | u32 duration, unsigned long flags) | ||
60 | { | ||
61 | if (flags & ~NVGPU_TIMER_FLAG_MASK) | ||
62 | return -EINVAL; | ||
63 | |||
64 | memset(timeout, 0, sizeof(*timeout)); | ||
65 | |||
66 | timeout->g = g; | ||
67 | timeout->flags = flags; | ||
68 | |||
69 | if (flags & NVGPU_TIMER_RETRY_TIMER) | ||
70 | timeout->retries.max = duration; | ||
71 | else | ||
72 | timeout->time = ktime_to_ns(ktime_add_ns(ktime_get(), | ||
73 | (s64)NSEC_PER_MSEC * duration)); | ||
74 | |||
75 | return 0; | ||
76 | } | ||
77 | |||
78 | static int __nvgpu_timeout_expired_msg_cpu(struct nvgpu_timeout *timeout, | ||
79 | void *caller, | ||
80 | const char *fmt, va_list args) | ||
81 | { | ||
82 | struct gk20a *g = timeout->g; | ||
83 | ktime_t now = ktime_get(); | ||
84 | |||
85 | if (nvgpu_timeout_is_pre_silicon(timeout)) | ||
86 | return 0; | ||
87 | |||
88 | if (ktime_after(now, ns_to_ktime(timeout->time))) { | ||
89 | if (!(timeout->flags & NVGPU_TIMER_SILENT_TIMEOUT)) { | ||
90 | char buf[128]; | ||
91 | |||
92 | vsnprintf(buf, sizeof(buf), fmt, args); | ||
93 | |||
94 | nvgpu_err(g, "Timeout detected @ %pF %s", caller, buf); | ||
95 | } | ||
96 | |||
97 | return -ETIMEDOUT; | ||
98 | } | ||
99 | |||
100 | return 0; | ||
101 | } | ||
102 | |||
103 | static int __nvgpu_timeout_expired_msg_retry(struct nvgpu_timeout *timeout, | ||
104 | void *caller, | ||
105 | const char *fmt, va_list args) | ||
106 | { | ||
107 | struct gk20a *g = timeout->g; | ||
108 | |||
109 | if (nvgpu_timeout_is_pre_silicon(timeout)) | ||
110 | return 0; | ||
111 | |||
112 | if (timeout->retries.attempted >= timeout->retries.max) { | ||
113 | if (!(timeout->flags & NVGPU_TIMER_SILENT_TIMEOUT)) { | ||
114 | char buf[128]; | ||
115 | |||
116 | vsnprintf(buf, sizeof(buf), fmt, args); | ||
117 | |||
118 | nvgpu_err(g, "No more retries @ %pF %s", caller, buf); | ||
119 | } | ||
120 | |||
121 | return -ETIMEDOUT; | ||
122 | } | ||
123 | |||
124 | timeout->retries.attempted++; | ||
125 | |||
126 | return 0; | ||
127 | } | ||
128 | |||
129 | /** | ||
130 | * __nvgpu_timeout_expired_msg - Check if a timeout has expired. | ||
131 | * | ||
132 | * @timeout - The timeout to check. | ||
133 | * @caller - Address of the caller of this function. | ||
134 | * @fmt - The fmt string. | ||
135 | * | ||
136 | * Returns -ETIMEDOUT if the timeout has expired, 0 otherwise. | ||
137 | * | ||
138 | * If a timeout occurs and %NVGPU_TIMER_SILENT_TIMEOUT is not set in the timeout | ||
139 | * then a message is printed based on %fmt. | ||
140 | */ | ||
141 | int __nvgpu_timeout_expired_msg(struct nvgpu_timeout *timeout, | ||
142 | void *caller, const char *fmt, ...) | ||
143 | { | ||
144 | int ret; | ||
145 | va_list args; | ||
146 | |||
147 | va_start(args, fmt); | ||
148 | if (timeout->flags & NVGPU_TIMER_RETRY_TIMER) | ||
149 | ret = __nvgpu_timeout_expired_msg_retry(timeout, caller, fmt, | ||
150 | args); | ||
151 | else | ||
152 | ret = __nvgpu_timeout_expired_msg_cpu(timeout, caller, fmt, | ||
153 | args); | ||
154 | va_end(args); | ||
155 | |||
156 | return ret; | ||
157 | } | ||
158 | |||
159 | /** | ||
160 | * nvgpu_timeout_peek_expired - Check the status of a timeout. | ||
161 | * | ||
162 | * @timeout - The timeout to check. | ||
163 | * | ||
164 | * Returns non-zero if the timeout is expired, zero otherwise. In the case of | ||
165 | * retry timers this will not increment the underlying retry count. Also if the | ||
166 | * timer has expired no messages will be printed. | ||
167 | * | ||
168 | * This function honors the pre-Si check as well. | ||
169 | */ | ||
170 | int nvgpu_timeout_peek_expired(struct nvgpu_timeout *timeout) | ||
171 | { | ||
172 | if (nvgpu_timeout_is_pre_silicon(timeout)) | ||
173 | return 0; | ||
174 | |||
175 | if (timeout->flags & NVGPU_TIMER_RETRY_TIMER) | ||
176 | return timeout->retries.attempted >= timeout->retries.max; | ||
177 | else | ||
178 | return ktime_after(ktime_get(), ns_to_ktime(timeout->time)); | ||
179 | } | ||
180 | |||
181 | /** | ||
182 | * nvgpu_udelay - Delay for some number of microseconds. | ||
183 | * | ||
184 | * @usecs - Microseconds to wait for. | ||
185 | * | ||
186 | * Wait for at least @usecs microseconds. This is not guaranteed to be perfectly | ||
187 | * accurate. This is normally backed by a busy-loop so this means waits should | ||
188 | * be kept short, below 100us. If longer delays are necessary then | ||
189 | * nvgpu_msleep() should be preferred. | ||
190 | * | ||
191 | * Alternatively, on some platforms, nvgpu_usleep_range() is usable. This | ||
192 | * function will attempt to not use a busy-loop. | ||
193 | */ | ||
194 | void nvgpu_udelay(unsigned int usecs) | ||
195 | { | ||
196 | udelay(usecs); | ||
197 | } | ||
198 | |||
199 | /** | ||
200 | * nvgpu_usleep_range - Sleep for a range of microseconds. | ||
201 | * | ||
202 | * @min_us - Minimum wait time. | ||
203 | * @max_us - Maximum wait time. | ||
204 | * | ||
205 | * Wait for some number of microseconds between @min_us and @max_us. This, | ||
206 | * unlike nvgpu_udelay(), will attempt to sleep for the passed number of | ||
207 | * microseconds instead of busy looping. Not all platforms support this, | ||
208 | * and in that case this reduces to nvgpu_udelay(min_us). | ||
209 | * | ||
210 | * Linux note: this is not safe to use in atomic context. If you are in | ||
211 | * atomic context you must use nvgpu_udelay(). | ||
212 | */ | ||
213 | void nvgpu_usleep_range(unsigned int min_us, unsigned int max_us) | ||
214 | { | ||
215 | usleep_range(min_us, max_us); | ||
216 | } | ||
217 | |||
218 | /** | ||
219 | * nvgpu_msleep - Sleep for some milliseconds. | ||
220 | * | ||
221 | * @msecs - Sleep for at least this many milliseconds. | ||
222 | * | ||
223 | * Sleep for at least @msecs of milliseconds. For small @msecs (less than 20 ms | ||
224 | * or so) the sleep will be significantly longer due to scheduling overhead and | ||
225 | * mechanics. | ||
226 | */ | ||
227 | void nvgpu_msleep(unsigned int msecs) | ||
228 | { | ||
229 | msleep(msecs); | ||
230 | } | ||
231 | |||
232 | /** | ||
233 | * nvgpu_current_time_ms - Time in milliseconds from a monotonic clock. | ||
234 | * | ||
235 | * Return a clock in millisecond units. The start time of the clock is | ||
236 | * unspecified; the time returned can be compared with older ones to measure | ||
237 | * durations. The source clock does not jump when the system clock is adjusted. | ||
238 | */ | ||
239 | s64 nvgpu_current_time_ms(void) | ||
240 | { | ||
241 | return ktime_to_ms(ktime_get()); | ||
242 | } | ||
243 | |||
244 | /** | ||
245 | * nvgpu_current_time_ns - Time in nanoseconds from a monotonic clock. | ||
246 | * | ||
247 | * Return a clock in nanosecond units. The start time of the clock is | ||
248 | * unspecified; the time returned can be compared with older ones to measure | ||
249 | * durations. The source clock does not jump when the system clock is adjusted. | ||
250 | */ | ||
251 | s64 nvgpu_current_time_ns(void) | ||
252 | { | ||
253 | return ktime_to_ns(ktime_get()); | ||
254 | } | ||
255 | |||
256 | /** | ||
257 | * nvgpu_hr_timestamp - Opaque 'high resolution' time stamp. | ||
258 | * | ||
259 | * Return a "high resolution" time stamp. It does not really matter exactly what | ||
260 | * it is, so long as it generally returns unique values and monotonically | ||
261 | * increases - wrap around _is_ possible though in a system running for long | ||
262 | * enough. | ||
263 | * | ||
264 | * Note: what high resolution means is system dependent. | ||
265 | */ | ||
266 | u64 nvgpu_hr_timestamp(void) | ||
267 | { | ||
268 | return get_cycles(); | ||
269 | } | ||