diff options
author | Alex Waterman <alexw@nvidia.com> | 2016-11-11 17:35:54 -0500 |
---|---|---|
committer | mobile promotions <svcmobile_promotions@nvidia.com> | 2016-12-05 19:16:16 -0500 |
commit | d8fd0e64678997b535c3208ce8cc081b1cac7fa9 (patch) | |
tree | 25b93f0c10de6bfe2450b9e189bb4ee5bff28182 /drivers/gpu/nvgpu/common/linux | |
parent | 37d4b649d43e1024859d56becfaaa25a0a41868c (diff) |
gpu: nvgpu: Add timeout API
Add a timeout API to nvgpu since this is a common operation done all
across the nvgpu driver.
Also add two new directories for this common code:
drivers/gpu/nvgpu/common
drivers/gpu/nvgpu/include/nvgpu
The common directory is for common C code. The include directory is for
common include files.
Bug 1799159
Change-Id: I8b710eecaa75c0707df83f859fb28484525185a6
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/1255864
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Diffstat (limited to 'drivers/gpu/nvgpu/common/linux')
-rw-r--r-- | drivers/gpu/nvgpu/common/linux/timers.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/drivers/gpu/nvgpu/common/linux/timers.c b/drivers/gpu/nvgpu/common/linux/timers.c new file mode 100644 index 00000000..e1e08f82 --- /dev/null +++ b/drivers/gpu/nvgpu/common/linux/timers.c | |||
@@ -0,0 +1,177 @@ | |||
1 | /* | ||
2 | * Copyright (c) 2016, 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/jiffies.h> | ||
18 | |||
19 | #include <nvgpu/timers.h> | ||
20 | |||
21 | #include "gk20a/gk20a.h" | ||
22 | |||
23 | /* | ||
24 | * Returns 1 if the platform is pre-Si and should ignore the timeout checking. | ||
25 | * Setting %NVGPU_TIMER_NO_PRE_SI will make this always return 0 (i.e do the | ||
26 | * timeout check regardless of platform). | ||
27 | */ | ||
28 | static int nvgpu_timeout_is_pre_silicon(struct nvgpu_timeout *timeout) | ||
29 | { | ||
30 | if (timeout->flags & NVGPU_TIMER_NO_PRE_SI) | ||
31 | return 0; | ||
32 | |||
33 | return !tegra_platform_is_silicon(); | ||
34 | } | ||
35 | |||
36 | /** | ||
37 | * nvgpu_timeout_init - Init timer. | ||
38 | * | ||
39 | * @g - nvgpu device. | ||
40 | * @timeout - The timer. | ||
41 | * @duration - Timeout in milliseconds or number of retries. | ||
42 | * @flags - Flags for timer. | ||
43 | * | ||
44 | * This configures the timeout to start the timeout duration now, i.e: when this | ||
45 | * function is called. Available flags to pass to @flags: | ||
46 | * | ||
47 | * %NVGPU_TIMER_CPU_TIMER | ||
48 | * %NVGPU_TIMER_RETRY_TIMER | ||
49 | * %NVGPU_TIMER_NO_PRE_SI | ||
50 | * %NVGPU_TIMER_SILENT_TIMEOUT | ||
51 | * | ||
52 | * If neither %NVGPU_TIMER_CPU_TIMER or %NVGPU_TIMER_RETRY_TIMER is passed then | ||
53 | * a CPU timer is used by default. | ||
54 | */ | ||
55 | int nvgpu_timeout_init(struct gk20a *g, struct nvgpu_timeout *timeout, | ||
56 | int duration, unsigned long flags) | ||
57 | { | ||
58 | if (flags & ~NVGPU_TIMER_FLAG_MASK) | ||
59 | return -EINVAL; | ||
60 | |||
61 | memset(timeout, 0, sizeof(*timeout)); | ||
62 | |||
63 | timeout->g = g; | ||
64 | timeout->flags = flags; | ||
65 | |||
66 | if (flags & NVGPU_TIMER_RETRY_TIMER) | ||
67 | timeout->retries.max = duration; | ||
68 | else | ||
69 | timeout->time = jiffies + msecs_to_jiffies(duration); | ||
70 | |||
71 | return 0; | ||
72 | } | ||
73 | |||
74 | static int __nvgpu_timeout_check_msg_cpu(struct nvgpu_timeout *timeout, | ||
75 | void *caller, | ||
76 | const char *fmt, va_list args) | ||
77 | { | ||
78 | struct gk20a *g = timeout->g; | ||
79 | unsigned long now = jiffies; | ||
80 | |||
81 | if (nvgpu_timeout_is_pre_silicon(timeout)) | ||
82 | return 0; | ||
83 | |||
84 | if (time_after(now, (unsigned long)timeout->time)) { | ||
85 | if (!(timeout->flags & NVGPU_TIMER_SILENT_TIMEOUT)) { | ||
86 | char buf[128]; | ||
87 | |||
88 | vsnprintf(buf, sizeof(buf), fmt, args); | ||
89 | |||
90 | dev_err(dev_from_gk20a(g), | ||
91 | "Timeout detected @ 0x%pF %s\n", caller, buf); | ||
92 | } | ||
93 | |||
94 | return -ETIMEDOUT; | ||
95 | } | ||
96 | |||
97 | return 0; | ||
98 | } | ||
99 | |||
100 | static int __nvgpu_timeout_check_msg_retry(struct nvgpu_timeout *timeout, | ||
101 | void *caller, | ||
102 | const char *fmt, va_list args) | ||
103 | { | ||
104 | struct gk20a *g = timeout->g; | ||
105 | |||
106 | if (nvgpu_timeout_is_pre_silicon(timeout)) | ||
107 | return 0; | ||
108 | |||
109 | if (timeout->retries.attempted >= timeout->retries.max) { | ||
110 | if (!(timeout->flags & NVGPU_TIMER_SILENT_TIMEOUT)) { | ||
111 | char buf[128]; | ||
112 | |||
113 | vsnprintf(buf, sizeof(buf), fmt, args); | ||
114 | |||
115 | dev_err(dev_from_gk20a(g), | ||
116 | "No more retries @ 0x%pF %s\n", caller, buf); | ||
117 | } | ||
118 | |||
119 | return -ETIMEDOUT; | ||
120 | } | ||
121 | |||
122 | timeout->retries.attempted++; | ||
123 | |||
124 | return 0; | ||
125 | } | ||
126 | |||
127 | /** | ||
128 | * __nvgpu_timeout_check_msg - Check if a timeout has expired. | ||
129 | * | ||
130 | * @timeout - The timeout to check. | ||
131 | * @caller - Address of the caller of this function. | ||
132 | * @fmt - The fmt string. | ||
133 | * | ||
134 | * Returns -ETIMEDOUT if the timeout has expired, 0 otherwise. | ||
135 | * | ||
136 | * If a timeout occurs and %NVGPU_TIMER_SILENT_TIMEOUT is not set in the timeout | ||
137 | * then a message is printed based on %fmt. | ||
138 | */ | ||
139 | int __nvgpu_timeout_check_msg(struct nvgpu_timeout *timeout, | ||
140 | void *caller, const char *fmt, ...) | ||
141 | { | ||
142 | int ret; | ||
143 | va_list args; | ||
144 | |||
145 | va_start(args, fmt); | ||
146 | if (timeout->flags & NVGPU_TIMER_RETRY_TIMER) | ||
147 | ret = __nvgpu_timeout_check_msg_retry(timeout, caller, fmt, | ||
148 | args); | ||
149 | else | ||
150 | ret = __nvgpu_timeout_check_msg_cpu(timeout, caller, fmt, | ||
151 | args); | ||
152 | va_end(args); | ||
153 | |||
154 | return ret; | ||
155 | } | ||
156 | |||
157 | /** | ||
158 | * nvgpu_timeout_peek - Check the status of a timeout. | ||
159 | * | ||
160 | * @timeout - The timeout to check. | ||
161 | * | ||
162 | * Returns non-zero if the timeout is expired, zero otherwise. In the case of | ||
163 | * retry timers this will not increment the underlying retry count. Also if the | ||
164 | * timer has expired no messages will be printed. | ||
165 | * | ||
166 | * This function honors the pre-Si check as well. | ||
167 | */ | ||
168 | int nvgpu_timeout_peek(struct nvgpu_timeout *timeout) | ||
169 | { | ||
170 | if (nvgpu_timeout_is_pre_silicon(timeout)) | ||
171 | return 0; | ||
172 | |||
173 | if (timeout->flags & NVGPU_TIMER_RETRY_TIMER) | ||
174 | return timeout->retries.attempted >= timeout->retries.max; | ||
175 | else | ||
176 | return time_after(jiffies, (unsigned long)timeout->time); | ||
177 | } | ||