linux-kernel - [PATCH 16/16] habanalabs/gaudi: invalidate PMMU mem cache on init

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Message-Id: <20210818133922.63637-16-ogabbay@kernel.org>
Date:   Wed, 18 Aug 2021 16:39:22 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Subject: [PATCH 16/16] habanalabs/gaudi: invalidate PMMU mem cache on init

This must be done to clear the internal mem cache so we won't get
ecc errors on the first invalidation.

Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/gaudi/gaudi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/misc/habanalabs/gaudi/gaudi.c b/drivers/misc/habanalabs/gaudi/gaudi.c
index f244a1b8abca..ca9c3b9f08a1 100644
--- a/drivers/misc/habanalabs/gaudi/gaudi.c
+++ b/drivers/misc/habanalabs/gaudi/gaudi.c
@@ -3906,6 +3906,9 @@ static int gaudi_mmu_init(struct hl_device *hdev)
 	WREG32(mmSTLB_CACHE_INV_BASE_39_8, MMU_CACHE_MNG_ADDR >> 8);
 	WREG32(mmSTLB_CACHE_INV_BASE_49_40, MMU_CACHE_MNG_ADDR >> 40);
 
+	/* mem cache invalidation */
+	WREG32(mmSTLB_MEM_CACHE_INVALIDATION, 1);
+
 	hdev->asic_funcs->mmu_invalidate_cache(hdev, true, 0);
 
 	WREG32(mmMMU_UP_MMU_ENABLE, 1);
-- 
2.17.1