linux-kernel - [PATCH 3/3] habanalabs: disable FW events on device removal

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Message-Id: <20210118185217.4389-3-ogabbay@kernel.org>
Date:   Mon, 18 Jan 2021 20:52:17 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] habanalabs: disable FW events on device removal

When device is removed, we need to make sure the F/W won't send us
any more events because during the remove process we disable the
interrupts.

Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/device.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index 1ea57d86caa3..69d04eca767f 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -1487,6 +1487,15 @@ void hl_device_fini(struct hl_device *hdev)
 		}
 	}
 
+	/* Disable PCI access from device F/W so it won't send us additional
+	 * interrupts. We disable MSI/MSI-X at the halt_engines function and we
+	 * can't have the F/W sending us interrupts after that. We need to
+	 * disable the access here because if the device is marked disable, the
+	 * message won't be send. Also, in case of heartbeat, the device CPU is
+	 * marked as disable so this message won't be sent
+	 */
+	hl_fw_send_pci_access_msg(hdev,	CPUCP_PACKET_DISABLE_PCI_ACCESS);
+
 	/* Mark device as disabled */
 	hdev->disabled = true;
 
-- 
2.25.1