linux-kernel - [PATCH 5.15 123/171] octeontx2-pf: cn10k: Ensure valid pointers are freed to aura

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Message-Id: <20220131105234.195446079@linuxfoundation.org>
Date:   Mon, 31 Jan 2022 11:56:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Geetha sowjanya <gakula@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>,
        Sunil Goutham <sgoutham@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 123/171] octeontx2-pf: cn10k: Ensure valid pointers are freed to aura

From: Geetha sowjanya <gakula@...vell.com>

[ Upstream commit c5d731c54a17677939bd59ee8be4ed74d7485ba4 ]

While freeing SQB pointers to aura, driver first memcpy to
target address and then triggers lmtst operation to free pointer
to the aura. We need to ensure(by adding dmb barrier)that memcpy
is finished before pointers are freed to the aura. This patch also
adds the missing sq context structure entry in debugfs.

Fixes: ef6c8da71eaf ("octeontx2-pf: cn10K: Reserve LMTST lines per core")
Signed-off-by: Geetha sowjanya <gakula@...vell.com>
Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c  | 2 ++
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
index 49d822a98adab..f001579569a2b 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_debugfs.c
@@ -1131,6 +1131,8 @@ static void print_nix_cn10k_sq_ctx(struct seq_file *m,
 	seq_printf(m, "W3: head_offset\t\t\t%d\nW3: smenq_next_sqb_vld\t\t%d\n\n",
 		   sq_ctx->head_offset, sq_ctx->smenq_next_sqb_vld);
 
+	seq_printf(m, "W3: smq_next_sq_vld\t\t%d\nW3: smq_pend\t\t\t%d\n",
+		   sq_ctx->smq_next_sq_vld, sq_ctx->smq_pend);
 	seq_printf(m, "W4: next_sqb \t\t\t%llx\n\n", sq_ctx->next_sqb);
 	seq_printf(m, "W5: tail_sqb \t\t\t%llx\n\n", sq_ctx->tail_sqb);
 	seq_printf(m, "W6: smenq_sqb \t\t\t%llx\n\n", sq_ctx->smenq_sqb);
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
index a51ecd771d075..637450de189c8 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
@@ -591,6 +591,7 @@ static inline void __cn10k_aura_freeptr(struct otx2_nic *pfvf, u64 aura,
 			size++;
 		tar_addr |=  ((size - 1) & 0x7) << 4;
 	}
+	dma_wmb();
 	memcpy((u64 *)lmt_info->lmt_addr, ptrs, sizeof(u64) * num_ptrs);
 	/* Perform LMTST flush */
 	cn10k_lmt_flush(val, tar_addr);
-- 
2.34.1