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gpu: nvgpu: support per-channel wdt timeouts

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Replace the padding in nvgpu_channel_wdt_args with a timeout value in
milliseconds, and add NVGPU_IOCTL_CHANNEL_WDT_FLAG_SET_TIMEOUT to
signify the existence of this new field. When the new flag is included
in the value of wdt_status, the field is used to set a per-channel
timeout to override the per-GPU default.

Add NVGPU_IOCTL_CHANNEL_WDT_FLAG_DISABLE_DUMP to disable the long debug
dump when a timed out channel gets recovered by the watchdog. Printing
the dump to serial console takes easily several seconds. (Note that
there is NVGPU_TIMEOUT_FLAG_DISABLE_DUMP about ctxsw timeout separately
for NVGPU_IOCTL_CHANNEL_SET_TIMEOUT_EX as well.)

The behaviour of NVGPU_IOCTL_CHANNEL_WDT is changed so that either
NVGPU_IOCTL_CHANNEL_ENABLE_WDT or NVGPU_IOCTL_CHANNEL_DISABLE_WDT has to
be set. The old behaviour was that other values were silently ignored.

The usage of the global default debugfs-controlled ch_wdt_timeout_ms is
changed so that its value takes effect only for newly opened channels
instead of in realtime. Also, zero value no longer means that the
watchdog is disabled; there is a separate flag for that after all.

gk20a_fifo_recover_tsg used to ignore the value of "verbose" when no
engines were found. Correct this.

Bug 1982826
Bug 1985845
Jira NVGPU-73

Change-Id: Iea6213a646a66cb7c631ed7d7c91d8c2ba8a92a4
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1510898
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Konsta Holtta
2018-02-21 16:42:37 +02:00
committed by mobile promotions
parent 4f9368522e
commit cb6ed949e2
7 changed files with 50 additions and 30 deletions
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10
include/uapi/linux/nvgpu.h
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@@ -1577,13 +1577,15 @@ struct nvgpu_cycle_stats_snapshot_args {
#define NVGPU_IOCTL_CHANNEL_CYCLE_STATS_SNAPSHOT_CMD_ATTACH 1
#define NVGPU_IOCTL_CHANNEL_CYCLE_STATS_SNAPSHOT_CMD_DETACH 2
/* disable watchdog per-channel */
/* configure watchdog per-channel */
struct nvgpu_channel_wdt_args {
__u32 wdt_status;
__u32 padding;
__u32 timeout_ms;
};
#define NVGPU_IOCTL_CHANNEL_DISABLE_WDT 1
#define NVGPU_IOCTL_CHANNEL_ENABLE_WDT 2
#define NVGPU_IOCTL_CHANNEL_DISABLE_WDT (1 << 0)
#define NVGPU_IOCTL_CHANNEL_ENABLE_WDT (1 << 1)
#define NVGPU_IOCTL_CHANNEL_WDT_FLAG_SET_TIMEOUT (1 << 2)
#define NVGPU_IOCTL_CHANNEL_WDT_FLAG_DISABLE_DUMP (1 << 3)
/*
* Interleaving channels in a runlist is an approach to improve