linux-kernel - [PATCH 13/26] habanalabs: adjacent timestamps should be more accurate

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Date:   Thu,  8 Dec 2022 17:13:37 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Tamir Gilad-Raz <tgiladraz@...ana.ai>
Subject: [PATCH 13/26] habanalabs: adjacent timestamps should be more accurate

From: Tamir Gilad-Raz <tgiladraz@...ana.ai>

timestamp events that expire on the same interrupt will get the same
timestamp value

Signed-off-by: Tamir Gilad-Raz <tgiladraz@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/irq.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/habanalabs/common/irq.c b/drivers/misc/habanalabs/common/irq.c
index 94d537fd4fde..8bbcc223df91 100644
--- a/drivers/misc/habanalabs/common/irq.c
+++ b/drivers/misc/habanalabs/common/irq.c
@@ -228,7 +228,7 @@ static void hl_ts_free_objects(struct work_struct *work)
  * list to a dedicated workqueue to do the actual put.
  */
 static int handle_registration_node(struct hl_device *hdev, struct hl_user_pending_interrupt *pend,
-						struct list_head **free_list)
+						struct list_head **free_list, ktime_t now)
 {
 	struct timestamp_reg_free_node *free_node;
 	u64 timestamp;
@@ -246,7 +246,7 @@ static int handle_registration_node(struct hl_device *hdev, struct hl_user_pendi
 	if (!free_node)
 		return -ENOMEM;
 
-	timestamp = ktime_get_ns();
+	timestamp = ktime_to_ns(now);
 
 	*pend->ts_reg_info.timestamp_kernel_addr = timestamp;
 
@@ -298,7 +298,7 @@ static void handle_user_interrupt(struct hl_device *hdev, struct hl_user_interru
 			if (pend->ts_reg_info.buf) {
 				if (!reg_node_handle_fail) {
 					rc = handle_registration_node(hdev, pend,
-									&ts_reg_free_list_head);
+								&ts_reg_free_list_head, now);
 					if (rc)
 						reg_node_handle_fail = true;
 				}
-- 
2.25.1