linux-kernel - [PATCH 5.10 53/57] habanalabs: disable FW events on device removal

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Date:   Fri,  5 Feb 2021 15:07:19 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oded Gabbay <ogabbay@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 53/57] habanalabs: disable FW events on device removal

From: Oded Gabbay <ogabbay@...nel.org>

[ Upstream commit 2dc4a6d79168e7e426e8ddf8e7219c9ffd13b2b1 ]

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>
Signed-off-by: Sasha Levin <sashal@...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 09c328ee65da8..71b3a4d5adc65 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -1425,6 +1425,15 @@ 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;
 
-- 
2.27.0