linux-kernel - [PATCH 02/10] habanalabs/gaudi2: print page fault axi transaction id

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Message-Id: <20230119103339.718430-2-ogabbay@kernel.org>
Date:   Thu, 19 Jan 2023 12:33:31 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Dani Liberman <dliberman@...ana.ai>
Subject: [PATCH 02/10] habanalabs/gaudi2: print page fault axi transaction id

From: Dani Liberman <dliberman@...ana.ai>

AXI transaction id holds information about the initiator which caused
the page fault. In the future it will be translated automatically by
driver to an initiator name.

Signed-off-by: Dani Liberman <dliberman@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/accel/habanalabs/gaudi2/gaudi2.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/accel/habanalabs/gaudi2/gaudi2.c b/drivers/accel/habanalabs/gaudi2/gaudi2.c
index 8c0cbd3b4a0c..72e08c1eae22 100644
--- a/drivers/accel/habanalabs/gaudi2/gaudi2.c
+++ b/drivers/accel/habanalabs/gaudi2/gaudi2.c
@@ -8287,7 +8287,7 @@ static int gaudi2_handle_hif_fatal(struct hl_device *hdev, u16 event_type, u64 i
 static void gaudi2_handle_page_error(struct hl_device *hdev, u64 mmu_base, bool is_pmmu,
 					u64 *event_mask)
 {
-	u32 valid, val;
+	u32 valid, val, axid_l, axid_h;
 	u64 addr;
 
 	valid = RREG32(mmu_base + MMU_OFFSET(mmDCORE0_HMMU0_MMU_ACCESS_PAGE_ERROR_VALID));
@@ -8300,8 +8300,11 @@ static void gaudi2_handle_page_error(struct hl_device *hdev, u64 mmu_base, bool
 	addr <<= 32;
 	addr |= RREG32(mmu_base + MMU_OFFSET(mmDCORE0_HMMU0_MMU_PAGE_ERROR_CAPTURE_VA));
 
-	dev_err_ratelimited(hdev->dev, "%s page fault on va 0x%llx\n",
-				is_pmmu ? "PMMU" : "HMMU", addr);
+	axid_l = RREG32(mmu_base + MMU_OFFSET(mmDCORE0_HMMU0_MMU_PAGE_FAULT_ID_LSB));
+	axid_h = RREG32(mmu_base + MMU_OFFSET(mmDCORE0_HMMU0_MMU_PAGE_FAULT_ID_MSB));
+
+	dev_err_ratelimited(hdev->dev, "%s page fault on va 0x%llx, transaction id 0x%llX\n",
+				is_pmmu ? "PMMU" : "HMMU", addr, ((u64)axid_h << 32) + axid_l);
 	hl_handle_page_fault(hdev, addr, 0, is_pmmu, event_mask);
 
 	WREG32(mmu_base + MMU_OFFSET(mmDCORE0_HMMU0_MMU_PAGE_ERROR_CAPTURE), 0);
-- 
2.25.1