linux-kernel - [PATCH 09/33] powerpc/64s/exception: Add ISIDE option

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Date:   Tue, 12 Nov 2019 17:52:07 +0100
From:   Michal Suchanek <msuchanek@...e.de>
To:     linuxppc-dev@...ts.ozlabs.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Oleg Nesterov <oleg@...hat.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian@...uner.io>,
        Nicholas Piggin <npiggin@...il.com>,
        Allison Randal <allison@...utok.net>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Michal Suchanek <msuchanek@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Breno Leitao <leitao@...ian.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Claudio Carvalho <cclaudio@...ux.ibm.com>,
        Russell Currey <ruscur@...sell.cc>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Firoz Khan <firoz.khan@...aro.org>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Andrew Donnellan <andrew.donnellan@....ibm.com>,
        Nicolai Stange <nstange@...e.de>,
        Valentin Schneider <valentin.schneider@....com>,
        Diana Craciun <diana.craciun@....com>,
        Daniel Axtens <dja@...ens.net>,
        Michael Neuling <mikey@...ling.org>,
        Gustavo Romero <gromero@...ux.ibm.com>,
        Mathieu Malaterre <malat@...ian.org>,
        "Steven Rostedt" <rostedt@...dmis.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        David Howells <dhowells@...hat.com>,
        Brajeswar Ghosh <brajeswar.linux@...il.com>,
        Jagadeesh Pagadala <jagdsh.linux@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 09/33] powerpc/64s/exception: Add ISIDE option

From: Nicholas Piggin <npiggin@...il.com>

Rather than using DAR=2 to select the i-side registers, add an
explicit option.

Signed-off-by: Nicholas Piggin <npiggin@...il.com>
---
 arch/powerpc/kernel/exceptions-64s.S | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index bef0c2eee7dc..b8588618cdc3 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -199,6 +199,7 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
 #define IVEC		.L_IVEC_\name\()
 #define IHSRR		.L_IHSRR_\name\()
 #define IAREA		.L_IAREA_\name\()
+#define IISIDE		.L_IISIDE_\name\()
 #define IDAR		.L_IDAR_\name\()
 #define IDSISR		.L_IDSISR_\name\()
 #define ISET_RI		.L_ISET_RI_\name\()
@@ -231,6 +232,9 @@ do_define_int n
 	.ifndef IAREA
 		IAREA=PACA_EXGEN
 	.endif
+	.ifndef IISIDE
+		IISIDE=0
+	.endif
 	.ifndef IDAR
 		IDAR=0
 	.endif
@@ -542,7 +546,7 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
 	 */
 	GET_SCRATCH0(r10)
 	std	r10,IAREA+EX_R13(r13)
-	.if IDAR == 1
+	.if IDAR && !IISIDE
 	.if IHSRR
 	mfspr	r10,SPRN_HDAR
 	.else
@@ -550,7 +554,7 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
 	.endif
 	std	r10,IAREA+EX_DAR(r13)
 	.endif
-	.if IDSISR == 1
+	.if IDSISR && !IISIDE
 	.if IHSRR
 	mfspr	r10,SPRN_HDSISR
 	.else
@@ -625,16 +629,18 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
 	std	r9,GPR11(r1)
 	std	r10,GPR12(r1)
 	std	r11,GPR13(r1)
+
 	.if IDAR
-	.if IDAR == 2
+	.if IISIDE
 	ld	r10,_NIP(r1)
 	.else
 	ld	r10,IAREA+EX_DAR(r13)
 	.endif
 	std	r10,_DAR(r1)
 	.endif
+
 	.if IDSISR
-	.if IDSISR == 2
+	.if IISIDE
 	ld	r10,_MSR(r1)
 	lis	r11,DSISR_SRR1_MATCH_64S@h
 	and	r10,r10,r11
@@ -643,6 +649,7 @@ END_FTR_SECTION_NESTED(CPU_FTR_HAS_PPR,CPU_FTR_HAS_PPR,948)
 	.endif
 	std	r10,_DSISR(r1)
 	.endif
+
 BEGIN_FTR_SECTION_NESTED(66)
 	ld	r10,IAREA+EX_CFAR(r13)
 	std	r10,ORIG_GPR3(r1)
@@ -1311,8 +1318,9 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
 
 INT_DEFINE_BEGIN(instruction_access)
 	IVEC=0x400
-	IDAR=2
-	IDSISR=2
+	IISIDE=1
+	IDAR=1
+	IDSISR=1
 	IKVM_REAL=1
 INT_DEFINE_END(instruction_access)
 
@@ -1341,7 +1349,8 @@ INT_DEFINE_BEGIN(instruction_access_slb)
 	IVEC=0x480
 	IAREA=PACA_EXSLB
 	IRECONCILE=0
-	IDAR=2
+	IISIDE=1
+	IDAR=1
 	IKVM_REAL=1
 INT_DEFINE_END(instruction_access_slb)
 
-- 
2.23.0