linux-kernel - [PATCH 15/20] habanalabs/gaudi2: return to reset upon SM SEI BRESP error

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Date:   Thu, 17 Nov 2022 18:19:46 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Tomer Tayar <ttayar@...ana.ai>
Subject: [PATCH 15/20] habanalabs/gaudi2: return to reset upon SM SEI BRESP error

From: Tomer Tayar <ttayar@...ana.ai>

Due to a H/W issue in the LBW path to the PCIE_DBI MSI-X doorbell, there
were false sporadic error responses in SM when it was configured to
write to there, and hence no reset was done as part of handling the
relevant event.
Now that the virtual MSI-X doorbell is used, such errors in SM are not
expected and reset shouldn't be skipped.

Signed-off-by: Tomer Tayar <ttayar@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/gaudi2/gaudi2.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/drivers/misc/habanalabs/gaudi2/gaudi2.c b/drivers/misc/habanalabs/gaudi2/gaudi2.c
index d5efec347bc1..f0f2f77f56de 100644
--- a/drivers/misc/habanalabs/gaudi2/gaudi2.c
+++ b/drivers/misc/habanalabs/gaudi2/gaudi2.c
@@ -8300,11 +8300,10 @@ static void gaudi2_handle_mmu_spi_sei_generic(struct hl_device *hdev, const char
 	WREG32(mmu_base + MMU_INTERRUPT_CLR_OFFSET, interrupt_clr);
 }
 
-static bool gaudi2_handle_sm_err(struct hl_device *hdev, u8 sm_index)
+static void gaudi2_handle_sm_err(struct hl_device *hdev, u8 sm_index)
 {
 	u32 sei_cause_addr, sei_cause_val, sei_cause_cause, sei_cause_log;
 	u32 cq_intr_addr, cq_intr_val, cq_intr_queue_index;
-	bool reset = true;
 	int i;
 
 	sei_cause_addr = mmDCORE0_SYNC_MNGR_GLBL_SM_SEI_CAUSE + DCORE_OFFSET * sm_index;
@@ -8329,10 +8328,6 @@ static bool gaudi2_handle_sm_err(struct hl_device *hdev, u8 sm_index)
 					gaudi2_sm_sei_cause[i].cause_name,
 					gaudi2_sm_sei_cause[i].log_name,
 					sei_cause_log & gaudi2_sm_sei_cause[i].log_mask);
-
-			/* Due to a potential H/W issue, do not reset upon BRESP errors */
-			if (i == 2)
-				reset = false;
 			break;
 		}
 
@@ -8352,8 +8347,6 @@ static bool gaudi2_handle_sm_err(struct hl_device *hdev, u8 sm_index)
 		/* Clear CQ_INTR */
 		WREG32(cq_intr_addr, 0);
 	}
-
-	return reset;
 }
 
 static void gaudi2_handle_mmu_spi_sei_err(struct hl_device *hdev, u16 event_type, u64 *event_mask)
@@ -8755,8 +8748,8 @@ static void hl_arc_event_handle(struct hl_device *hdev,
 
 static void gaudi2_handle_eqe(struct hl_device *hdev, struct hl_eq_entry *eq_entry)
 {
-	bool reset_required = false, skip_reset = false, is_critical = false;
 	struct gaudi2_device *gaudi2 = hdev->asic_specific;
+	bool reset_required = false, is_critical = false;
 	u32 ctl, reset_flags = HL_DRV_RESET_HARD;
 	int index, sbte_index;
 	u64 event_mask = 0;
@@ -9113,7 +9106,7 @@ static void gaudi2_handle_eqe(struct hl_device *hdev, struct hl_eq_entry *eq_ent
 
 	case GAUDI2_EVENT_SM0_AXI_ERROR_RESPONSE ... GAUDI2_EVENT_SM3_AXI_ERROR_RESPONSE:
 		index = event_type - GAUDI2_EVENT_SM0_AXI_ERROR_RESPONSE;
-		skip_reset = !gaudi2_handle_sm_err(hdev, index);
+		gaudi2_handle_sm_err(hdev, index);
 		event_mask |= HL_NOTIFIER_EVENT_USER_ENGINE_ERR;
 		break;
 
@@ -9153,9 +9146,9 @@ static void gaudi2_handle_eqe(struct hl_device *hdev, struct hl_eq_entry *eq_ent
 						event_type);
 	}
 
-	if ((gaudi2_irq_map_table[event_type].reset || reset_required) && !skip_reset &&
-			(hdev->hard_reset_on_fw_events ||
-			(hdev->asic_prop.fw_security_enabled && is_critical)))
+	if ((gaudi2_irq_map_table[event_type].reset || reset_required) &&
+				(hdev->hard_reset_on_fw_events ||
+				(hdev->asic_prop.fw_security_enabled && is_critical)))
 		goto reset_device;
 
 	/* Send unmask irq only for interrupts not classified as MSG */
-- 
2.25.1