gpu: nvgpu: support per-channel wdt timeouts

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/channel.c b/drivers/gpu/nvgpu/common/linux/channel.c
index 8bfa4cfc..ea294738 100644
--- a/drivers/gpu/nvgpu/common/linux/channel.c
+++ b/drivers/gpu/nvgpu/common/linux/channel.c
@@ -753,7 +753,7 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
          */
         need_job_tracking = (flags & NVGPU_SUBMIT_GPFIFO_FLAGS_FENCE_WAIT) ||
                         (flags & NVGPU_SUBMIT_GPFIFO_FLAGS_FENCE_GET) ||
-                        c->wdt_enabled ||
+                        c->timeout.enabled ||
                         (g->can_railgate && !c->deterministic) ||
                         !skip_buffer_refcounting;
 
@@ -791,7 +791,7 @@ int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
                  */
                 need_deferred_cleanup = !c->deterministic ||
                                         need_sync_framework ||
-                                        c->wdt_enabled ||
+                                        c->timeout.enabled ||
                                         (g->can_railgate &&
                                          !c->deterministic) ||
                                         !skip_buffer_refcounting;