linux-kernel - [PATCH 06/13] habanalabs/gaudi2: add device unavailable notification

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Date:   Thu,  6 Oct 2022 11:23:01 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Tal Cohen <talcohen@...ana.ai>
Subject: [PATCH 06/13] habanalabs/gaudi2: add device unavailable notification

From: Tal Cohen <talcohen@...ana.ai>

Device unavailable notifies the user that there isn't an option to
retrieve debug information from the device.
When a critical device error occurs and the f/w performs the device
reset, a device unavailable notification shall be sent to the user
process.

Signed-off-by: Tal Cohen <talcohen@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/gaudi2/gaudi2.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/gaudi2/gaudi2.c b/drivers/misc/habanalabs/gaudi2/gaudi2.c
index 90e1d7fcb17a..e05ffaa047a2 100644
--- a/drivers/misc/habanalabs/gaudi2/gaudi2.c
+++ b/drivers/misc/habanalabs/gaudi2/gaudi2.c
@@ -8576,7 +8576,7 @@ static void gaudi2_handle_eqe(struct hl_device *hdev, struct hl_eq_entry *eq_ent
 {
 	u32 ctl, reset_flags = HL_DRV_RESET_HARD | HL_DRV_RESET_DELAY;
 	struct gaudi2_device *gaudi2 = hdev->asic_specific;
-	bool reset_required = false, skip_reset = false;
+	bool reset_required = false, skip_reset = false, is_critical = false;
 	int index, sbte_index;
 	u64 event_mask = 0;
 	u16 event_type;
@@ -8602,6 +8602,7 @@ static void gaudi2_handle_eqe(struct hl_device *hdev, struct hl_eq_entry *eq_ent
 		reset_flags |= HL_DRV_RESET_FW_FATAL_ERR;
 		event_mask |= HL_NOTIFIER_EVENT_GENERAL_HW_ERR;
 		reset_required = gaudi2_handle_ecc_event(hdev, event_type, &eq_entry->ecc_data);
+		is_critical = eq_entry->ecc_data.is_critical;
 		break;
 
 	case GAUDI2_EVENT_TPC0_QM ... GAUDI2_EVENT_PDMA1_QM:
@@ -8976,9 +8977,16 @@ static void gaudi2_handle_eqe(struct hl_device *hdev, struct hl_eq_entry *eq_ent
 	return;
 
 reset_device:
-	if (hdev->hard_reset_on_fw_events) {
+	if (hdev->asic_prop.fw_security_enabled && is_critical) {
+		reset_flags = HL_DRV_RESET_HARD | HL_DRV_RESET_BYPASS_REQ_TO_FW;
+
+		/* notify on device unavailable while the reset triggered by fw */
+		event_mask |= (HL_NOTIFIER_EVENT_DEVICE_RESET |
+					HL_NOTIFIER_EVENT_DEVICE_UNAVAILABLE);
 		hl_device_reset(hdev, reset_flags);
+	} else if (hdev->hard_reset_on_fw_events) {
 		event_mask |= HL_NOTIFIER_EVENT_DEVICE_RESET;
+		hl_device_reset(hdev, reset_flags);
 	} else {
 		if (!gaudi2_irq_map_table[event_type].msg)
 			hl_fw_unmask_irq(hdev, event_type);
-- 
2.25.1