linux-kernel - [PATCH 6/7] habanalabs: add hard reset timeout for PLDM

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Message-Id: <20210609150343.4712-6-ogabbay@kernel.org>
Date:   Wed,  9 Jun 2021 18:03:42 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Omer Shpigelman <oshpigelman@...ana.ai>
Subject: [PATCH 6/7] habanalabs: add hard reset timeout for PLDM

From: Omer Shpigelman <oshpigelman@...ana.ai>

Hard reset flow on PLDM might take more than 2 minutes.
Hence add a dedicated hard reset timeout of 6 minutes for PLDM.

Signed-off-by: Omer Shpigelman <oshpigelman@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/device.c     | 9 +++++++--
 drivers/misc/habanalabs/common/habanalabs.h | 1 +
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index 46fcab1bf873..cbdf75b24cb4 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -1501,6 +1501,7 @@ int hl_device_init(struct hl_device *hdev, struct class *hclass)
 void hl_device_fini(struct hl_device *hdev)
 {
 	ktime_t timeout;
+	u64 reset_sec;
 	int i, rc;
 
 	dev_info(hdev->dev, "Removing device\n");
@@ -1508,6 +1509,11 @@ void hl_device_fini(struct hl_device *hdev)
 	hdev->device_fini_pending = 1;
 	flush_delayed_work(&hdev->device_reset_work.reset_work);
 
+	if (hdev->pldm)
+		reset_sec = HL_PLDM_HARD_RESET_MAX_TIMEOUT;
+	else
+		reset_sec = HL_HARD_RESET_MAX_TIMEOUT;
+
 	/*
 	 * This function is competing with the reset function, so try to
 	 * take the reset atomic and if we are already in middle of reset,
@@ -1516,8 +1522,7 @@ void hl_device_fini(struct hl_device *hdev)
 	 * ports, the hard reset could take between 10-30 seconds
 	 */
 
-	timeout = ktime_add_us(ktime_get(),
-				HL_HARD_RESET_MAX_TIMEOUT * 1000 * 1000);
+	timeout = ktime_add_us(ktime_get(), reset_sec * 1000 * 1000);
 	rc = atomic_cmpxchg(&hdev->in_reset, 0, 1);
 	while (rc) {
 		usleep_range(50, 200);
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index bc5a1b45270f..244fbf209d34 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -48,6 +48,7 @@
 #define HL_PENDING_RESET_LONG_SEC	60
 
 #define HL_HARD_RESET_MAX_TIMEOUT	120
+#define HL_PLDM_HARD_RESET_MAX_TIMEOUT	(HL_HARD_RESET_MAX_TIMEOUT * 3)
 
 #define HL_DEVICE_TIMEOUT_USEC		1000000 /* 1 s */
 
-- 
2.25.1