diff options
| author | Oded Gabbay <oded.gabbay@gmail.com> | 2019-02-28 10:46:21 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-28 13:07:52 +0100 |
| commit | af5f7eea45e1b177db961c4706625f4cf545c063 (patch) | |
| tree | a59b3f71bb2aa0dbd1f7e39129f5e30b75a11a4e /drivers/misc/habanalabs/command_submission.c | |
| parent | efaa281219fd37cb1ee5cdef483aa67a16b0a087 (diff) | |
| download | lwn-af5f7eea45e1b177db961c4706625f4cf545c063.tar.gz lwn-af5f7eea45e1b177db961c4706625f4cf545c063.zip | |
habanalabs: soft-reset device if context-switch fails
This patch fix a bug in the driver, where if the TPC or MME remains in
non-IDLE even after all the command submissions are done (due to user bug
or malicious user), then future command submissions will fail in the
context-switch stage and the driver will remain in "stuck" mode.
The fix is to do a soft-reset of the device in case the context-switch
fails, because the device should be IDLE during context-switch. If it is
not IDLE, then something is wrong and we should reset the compute engines.
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/habanalabs/command_submission.c')
| -rw-r--r-- | drivers/misc/habanalabs/command_submission.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/drivers/misc/habanalabs/command_submission.c b/drivers/misc/habanalabs/command_submission.c index 25ad9d805cfa..3525236ed8d9 100644 --- a/drivers/misc/habanalabs/command_submission.c +++ b/drivers/misc/habanalabs/command_submission.c @@ -622,13 +622,15 @@ int hl_cs_ioctl(struct hl_fpriv *hpriv, void *data) "Failed to switch to context %d, rejecting CS! %d\n", ctx->asid, rc); /* - * If we timedout, we need to soft-reset because - * QMAN is probably stuck. However, we can't - * call to reset here directly because of - * deadlock, so need to do it at the very end - * of this function + * If we timedout, or if the device is not IDLE + * while we want to do context-switch (-EBUSY), + * we need to soft-reset because QMAN is + * probably stuck. However, we can't call to + * reset here directly because of deadlock, so + * need to do it at the very end of this + * function */ - if (rc == -ETIMEDOUT) + if ((rc == -ETIMEDOUT) || (rc == -EBUSY)) need_soft_reset = true; mutex_unlock(&hpriv->restore_phase_mutex); goto out; @@ -706,7 +708,7 @@ out: args->out.seq = cs_seq; } - if ((rc == -ETIMEDOUT) && (need_soft_reset)) + if (((rc == -ETIMEDOUT) || (rc == -EBUSY)) && (need_soft_reset)) hl_device_reset(hdev, false, false); return rc; |