[PATCH 1/4] accel/habanalabs: ignore false positive razwi

[Oded Gabbay <ogabbay@kernel.org>]

From: Tal Cohen <talcohen@habana.ai>

In Gaudi2 asic, PSOC RAZWI may cause in HBW or LBW. The address that
caused the error is read from HW register and printed by the Driver.
There are cases where the Driver receives an indication on PSOC
RAZWI error but the address value is zero. In that case, the indication
is a false positive.
The Driver should not "count" a PSOC RAZWI event error when the
caused the address is zeroed.

Signed-off-by: Tal Cohen <talcohen@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
---
 drivers/accel/habanalabs/gaudi2/gaudi2.c | 43 +++++++++++++++---------
 1 file changed, 27 insertions(+), 16 deletions(-)

diff --git a/drivers/accel/habanalabs/gaudi2/gaudi2.c b/drivers/accel/habanalabs/gaudi2/gaudi2.c
index b778cf764a68..6f05aa230376 100644
--- a/drivers/accel/habanalabs/gaudi2/gaudi2.c
+++ b/drivers/accel/habanalabs/gaudi2/gaudi2.c
@@ -8251,6 +8251,7 @@ static bool gaudi2_handle_psoc_razwi_happened(struct hl_device *hdev, u32 razwi_
 	u16 num_of_eng, eng_id[PSOC_RAZWI_MAX_ENG_PER_RTR];
 	char eng_name_str[PSOC_RAZWI_ENG_STR_SIZE];
 	bool razwi_happened = false;
+	u64 addr;
 	int i;
 
 	num_of_eng = gaudi2_psoc_razwi_get_engines(common_razwi_info, ARRAY_SIZE(common_razwi_info),
@@ -8269,43 +8270,53 @@ static bool gaudi2_handle_psoc_razwi_happened(struct hl_device *hdev, u32 razwi_
 		if (RREG32(base[i] + DEC_RAZWI_HBW_AW_SET)) {
 			addr_hi = RREG32(base[i] + DEC_RAZWI_HBW_AW_ADDR_HI);
 			addr_lo = RREG32(base[i] + DEC_RAZWI_HBW_AW_ADDR_LO);
-			dev_err(hdev->dev,
+			addr = ((u64)addr_hi << 32) + addr_lo;
+			if (addr) {
+				dev_err(hdev->dev,
 					"PSOC HBW AW RAZWI: %s, address (aligned to 128 byte): 0x%llX\n",
-					eng_name_str, ((u64)addr_hi << 32) + addr_lo);
-			hl_handle_razwi(hdev, ((u64)addr_hi << 32) + addr_lo, &eng_id[0],
+					eng_name_str, addr);
+				hl_handle_razwi(hdev, addr, &eng_id[0],
 					num_of_eng, HL_RAZWI_HBW | HL_RAZWI_WRITE, event_mask);
-			razwi_happened = true;
+				razwi_happened = true;
+			}
 		}
 
 		if (RREG32(base[i] + DEC_RAZWI_HBW_AR_SET)) {
 			addr_hi = RREG32(base[i] + DEC_RAZWI_HBW_AR_ADDR_HI);
 			addr_lo = RREG32(base[i] + DEC_RAZWI_HBW_AR_ADDR_LO);
-			dev_err(hdev->dev,
+			addr = ((u64)addr_hi << 32) + addr_lo;
+			if (addr) {
+				dev_err(hdev->dev,
 					"PSOC HBW AR RAZWI: %s, address (aligned to 128 byte): 0x%llX\n",
-					eng_name_str, ((u64)addr_hi << 32) + addr_lo);
-			hl_handle_razwi(hdev, ((u64)addr_hi << 32) + addr_lo, &eng_id[0],
+					eng_name_str, addr);
+				hl_handle_razwi(hdev, addr, &eng_id[0],
 					num_of_eng, HL_RAZWI_HBW | HL_RAZWI_READ, event_mask);
-			razwi_happened = true;
+				razwi_happened = true;
+			}
 		}
 
 		if (RREG32(base[i] + DEC_RAZWI_LBW_AW_SET)) {
 			addr_lo = RREG32(base[i] + DEC_RAZWI_LBW_AW_ADDR);
-			dev_err(hdev->dev,
+			if (addr_lo) {
+				dev_err(hdev->dev,
 					"PSOC LBW AW RAZWI: %s, address (aligned to 128 byte): 0x%X\n",
 					eng_name_str, addr_lo);
-			hl_handle_razwi(hdev, addr_lo, &eng_id[0],
+				hl_handle_razwi(hdev, addr_lo, &eng_id[0],
 					num_of_eng, HL_RAZWI_LBW | HL_RAZWI_WRITE, event_mask);
-			razwi_happened = true;
+				razwi_happened = true;
+			}
 		}
 
 		if (RREG32(base[i] + DEC_RAZWI_LBW_AR_SET)) {
 			addr_lo = RREG32(base[i] + DEC_RAZWI_LBW_AR_ADDR);
-			dev_err(hdev->dev,
-					"PSOC LBW AR RAZWI: %s, address (aligned to 128 byte): 0x%X\n",
-					eng_name_str, addr_lo);
-			hl_handle_razwi(hdev, addr_lo, &eng_id[0],
+			if (addr_lo) {
+				dev_err(hdev->dev,
+						"PSOC LBW AR RAZWI: %s, address (aligned to 128 byte): 0x%X\n",
+						eng_name_str, addr_lo);
+				hl_handle_razwi(hdev, addr_lo, &eng_id[0],
 					num_of_eng, HL_RAZWI_LBW | HL_RAZWI_READ, event_mask);
-			razwi_happened = true;
+				razwi_happened = true;
+			}
 		}
 		/* In common case the loop will break, when there is only one engine id, or
 		 * several engines with the same router. The exceptional case is with psoc razwi
-- 
2.40.0