From 681a22f55f1506023da06ebf660a4a252b35bc93 Mon Sep 17 00:00:00 2001 From: Oded Gabbay Date: Mon, 7 Sep 2020 18:08:51 +0300 Subject: [PATCH] habanalabs: allow to wait on CS without sleep The user sometimes wants to check if a CS has completed to clean resources. In that case, the user doesn't want to sleep but just to check if the CS has finished and continue with his code. Add a new definition to the API of the wait on CS. The new definition says that if the timeout is 0, the driver won't sleep at all but return immediately after checking if the CS has finished. Signed-off-by: Oded Gabbay --- drivers/misc/habanalabs/common/command_submission.c | 7 +++++-- include/uapi/misc/habanalabs.h | 3 +++ 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/misc/habanalabs/common/command_submission.c b/drivers/misc/habanalabs/common/command_submission.c index 470bffb..b2b974e 100644 --- a/drivers/misc/habanalabs/common/command_submission.c +++ b/drivers/misc/habanalabs/common/command_submission.c @@ -1180,8 +1180,11 @@ static long _hl_cs_wait_ioctl(struct hl_device *hdev, "Can't wait on CS %llu because current CS is at seq %llu\n", seq, ctx->cs_sequence); } else if (fence) { - rc = wait_for_completion_interruptible_timeout( - &fence->completion, timeout); + if (!timeout_us) + rc = completion_done(&fence->completion); + else + rc = wait_for_completion_interruptible_timeout( + &fence->completion, timeout); if (fence->error == -ETIMEDOUT) rc = -ETIMEDOUT; diff --git a/include/uapi/misc/habanalabs.h b/include/uapi/misc/habanalabs.h index 69fb44d..d449f8a 100644 --- a/include/uapi/misc/habanalabs.h +++ b/include/uapi/misc/habanalabs.h @@ -914,6 +914,9 @@ struct hl_debug_args { * inside the kernel until the CS has finished or until the user-requested * timeout has expired. * + * If the timeout value is 0, the driver won't sleep at all. It will check + * the status of the CS and return immediately + * * The return value of the IOCTL is a standard Linux error code. The possible * values are: * -- 2.7.4