netdev - [PATCH v3,net-next,1/4] octeontx2-pf: move asm code to include/linux/soc

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Message-ID: <20200917132835.28325-2-schalla@marvell.com>
Date:   Thu, 17 Sep 2020 18:58:32 +0530
From:   Srujana Challa <schalla@...vell.com>
To:     <herbert@...dor.apana.org.au>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <kuba@...nel.org>, <sgoutham@...vell.com>, <gakula@...vell.com>,
        <sbhatta@...vell.com>, <schandran@...vell.com>,
        <pathreya@...vell.com>, Srujana Challa <schalla@...vell.com>
Subject: [PATCH v3,net-next,1/4] octeontx2-pf: move asm code to include/linux/soc

On OcteonTX2 platform CPT instruction enqueue and NIX
packet send are only possible via LMTST operations which
uses LDEOR instruction. This patch moves the asm code
from OcteonTX2 nic driver to include/linux/soc as it
will be used by OcteonTX2 CPT and NIC driver for
LMTST.

Signed-off-by: Srujana Challa <schalla@...vell.com>
---
 MAINTAINERS                                   |  2 ++
 .../marvell/octeontx2/nic/otx2_common.h       | 13 +--------
 include/linux/soc/marvell/octeontx2/asm.h     | 29 +++++++++++++++++++
 3 files changed, 32 insertions(+), 12 deletions(-)
 create mode 100644 include/linux/soc/marvell/octeontx2/asm.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 9a545a631f0d..95ddbb4f1a89 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10431,6 +10431,7 @@ M:	Srujana Challa <schalla@...vell.com>
 L:	linux-crypto@...r.kernel.org
 S:	Maintained
 F:	drivers/crypto/marvell/
+F:	include/linux/soc/marvell/octeontx2/
 
 MARVELL GIGABIT ETHERNET DRIVERS (skge/sky2)
 M:	Mirko Lindner <mlindner@...vell.com>
@@ -10503,6 +10504,7 @@ M:	hariprasad <hkelam@...vell.com>
 L:	netdev@...r.kernel.org
 S:	Supported
 F:	drivers/net/ethernet/marvell/octeontx2/nic/
+F:	include/linux/soc/marvell/octeontx2/
 
 MARVELL OCTEONTX2 RVU ADMIN FUNCTION DRIVER
 M:	Sunil Goutham <sgoutham@...vell.com>
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
index ac47762cce9b..12311964d9d6 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
@@ -16,6 +16,7 @@
 #include <linux/net_tstamp.h>
 #include <linux/ptp_clock_kernel.h>
 #include <linux/timecounter.h>
+#include <linux/soc/marvell/octeontx2/asm.h>
 
 #include <mbox.h>
 #include "otx2_reg.h"
@@ -420,21 +421,9 @@ static inline u64 otx2_atomic64_add(u64 incr, u64 *ptr)
 	return result;
 }
 
-static inline u64 otx2_lmt_flush(uint64_t addr)
-{
-	u64 result = 0;
-
-	__asm__ volatile(".cpu  generic+lse\n"
-			 "ldeor xzr,%x[rf],[%[rs]]"
-			 : [rf]"=r"(result)
-			 : [rs]"r"(addr));
-	return result;
-}
-
 #else
 #define otx2_write128(lo, hi, addr)
 #define otx2_atomic64_add(incr, ptr)		({ *ptr += incr; })
-#define otx2_lmt_flush(addr)			({ 0; })
 #endif
 
 /* Alloc pointer from pool/aura */
diff --git a/include/linux/soc/marvell/octeontx2/asm.h b/include/linux/soc/marvell/octeontx2/asm.h
new file mode 100644
index 000000000000..ae2279fe830a
--- /dev/null
+++ b/include/linux/soc/marvell/octeontx2/asm.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ * Copyright (C) 2020 Marvell.
+ */
+
+#ifndef __SOC_OTX2_ASM_H
+#define __SOC_OTX2_ASM_H
+
+#if defined(CONFIG_ARM64)
+/*
+ * otx2_lmt_flush is used for LMT store operation.
+ * On octeontx2 platform CPT instruction enqueue and
+ * NIX packet send are only possible via LMTST
+ * operations and it uses LDEOR instruction targeting
+ * the coprocessor address.
+ */
+#define otx2_lmt_flush(ioaddr)                          \
+({                                                      \
+	u64 result = 0;                                 \
+	__asm__ volatile(".cpu  generic+lse\n"          \
+			 "ldeor xzr, %x[rf], [%[rs]]"   \
+			 : [rf]"=r" (result)            \
+			 : [rs]"r" (ioaddr));           \
+	(result);                                       \
+})
+#else
+#define otx2_lmt_flush(ioaddr)          ({ 0; })
+#endif
+
+#endif /* __SOC_OTX2_ASM_H */
-- 
2.28.0