linux-kernel - [PATCH 01/16] habanalabs/gaudi: scrub HBM to a specific value

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Date:   Wed, 18 Aug 2021 16:39:07 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ofir Bitton <obitton@...ana.ai>
Subject: [PATCH 01/16] habanalabs/gaudi: scrub HBM to a specific value

From: Ofir Bitton <obitton@...ana.ai>

In order to enhance debuggability, we will scrub the whole HBM to
a specific value, in case HBM scrubbing is enabled. Scrubbing will be
performed after reset and after user closes the FD.

Signed-off-by: Ofir Bitton <obitton@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/gaudi/gaudi.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index 4ea45bdb9a71..6852bb8e55db 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -4194,6 +4194,11 @@ static int gaudi_hw_init(struct hl_device *hdev)
 		goto disable_msi;
 	}
 
+	/* Scrub both SRAM and DRAM */
+	rc = hdev->asic_funcs->scrub_device_mem(hdev, 0, 0);
+	if (rc)
+		return rc;
+
 	/* Perform read from the device to flush all configuration */
 	RREG32(mmHW_STATE);
 
@@ -4758,8 +4763,8 @@ static int gaudi_hbm_scrubbing(struct hl_device *hdev)
 				"Doing HBM scrubbing for 0x%09llx - 0x%09llx\n",
 				cur_addr, cur_addr + chunk_size);
 
-			WREG32(mmDMA0_CORE_SRC_BASE_LO + dma_offset, 0);
-			WREG32(mmDMA0_CORE_SRC_BASE_HI + dma_offset, 0);
+			WREG32(mmDMA0_CORE_SRC_BASE_LO + dma_offset, 0xdeadbeaf);
+			WREG32(mmDMA0_CORE_SRC_BASE_HI + dma_offset, 0xdeadbeaf);
 			WREG32(mmDMA0_CORE_DST_BASE_LO + dma_offset,
 						lower_32_bits(cur_addr));
 			WREG32(mmDMA0_CORE_DST_BASE_HI + dma_offset,
-- 
2.17.1