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From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>,
	Nicholas Piggin <npiggin@gmail.com>,
	Aravinda Prasad <aravinda@linux.vnet.ibm.com>
Subject: [PATCH v2 13/16] powerpc/64s/exception: simplify machine check early path
Date: Thu, 11 Jul 2019 01:19:47 +1000	[thread overview]
Message-ID: <20190710151950.31906-14-npiggin@gmail.com> (raw)
In-Reply-To: <20190710151950.31906-1-npiggin@gmail.com>

machine_check_handle_early_common can reach machine_check_handle_early
directly now that it runs at the relocated address, so just branch
directly.

The rfi sequence is required to enable MSR[ME] but that step is moved
into a helper function, making the code easier to follow.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/kernel/exceptions-64s.S | 31 ++++++++++++++++++++--------
 1 file changed, 22 insertions(+), 9 deletions(-)

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 9bb8c89e9e77..2a17275296d5 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -1006,16 +1006,13 @@ EXC_COMMON_BEGIN(machine_check_early_common)
 	std	r3,_DAR(r1)
 	std	r4,_DSISR(r1)
 
-	mfmsr	r11			/* get MSR value */
 BEGIN_FTR_SECTION
-	ori	r11,r11,MSR_ME		/* turn on ME bit */
+	bl	enable_machine_check
 END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
-	ori	r11,r11,MSR_RI		/* turn on RI bit */
-	LOAD_HANDLER(r12, machine_check_handle_early)
-1:	mtspr	SPRN_SRR0,r12
-	mtspr	SPRN_SRR1,r11
-	RFI_TO_KERNEL
-	b	.	/* prevent speculative execution */
+	li	r10,MSR_RI
+	mtmsrd	r10,1
+	b	machine_check_handle_early
+
 2:
 	/* Stack overflow. Stay on emergency stack and panic.
 	 * Keep the ME bit off while panic-ing, so that if we hit
@@ -1026,7 +1023,9 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
 	LOAD_HANDLER(r12, unrecover_mce)
 	li	r10,MSR_ME
 	andc	r11,r11,r10		/* Turn off MSR_ME */
-	b	1b
+	mtspr	SPRN_SRR0,r12
+	mtspr	SPRN_SRR1,r11
+	RFI_TO_KERNEL
 	b	.	/* prevent speculative execution */
 
 EXC_COMMON_BEGIN(machine_check_common)
@@ -2270,6 +2269,20 @@ CLOSE_FIXED_SECTION(virt_trampolines);
 
 USE_TEXT_SECTION()
 
+/* MSR[RI] should be clear because this uses SRR[01] */
+enable_machine_check:
+	mflr	r0
+	bcl	20,31,$+4
+0:	mflr	r3
+	addi	r3,r3,(1f - 0b)
+	mtspr	SPRN_SRR0,r3
+	mfmsr	r3
+	ori	r3,r3,MSR_ME
+	mtspr	SPRN_SRR1,r3
+	RFI_TO_KERNEL
+1:	mtlr	r0
+	blr
+
 /*
  * Hash table stuff
  */
-- 
2.20.1


  parent reply	other threads:[~2019-07-10 16:02 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-10 15:19 [PATCH v2 00/16] powerpc/64s: machine check cleanup series Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 01/16] powerpc/64s/exception: machine check fwnmi remove HV case Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 02/16] powerpc/64s/exception: machine check remove bitrotted comment Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 03/16] powerpc/64s/exception: machine check fix KVM guest test Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 04/16] powerpc/64s/exception: machine check adjust RFI target Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 05/16] powerpc/64s/exception: machine check pseries should always run the early handler Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 06/16] powerpc/64s/exception: machine check remove machine_check_pSeries_0 branch Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 07/16] powerpc/64s/exception: machine check use correct cfar for late handler Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 08/16] powerpc/64s/powernv: machine check dump SLB contents Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 09/16] powerpc/64s/pseries: machine check convert to use common event code Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 10/16] powerpc/64s/exception: machine check pseries should skip the late handler for host kernel MCEs Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 11/16] powerpc/64s/exception: machine check restructure to reuse common macros Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 12/16] powerpc/64s/exception: machine check move tramp code Nicholas Piggin
2019-07-10 15:19 ` Nicholas Piggin [this message]
2019-07-10 15:19 ` [PATCH v2 14/16] powerpc/64s/exception: machine check move unrecoverable handling out of line Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 15/16] powerpc/64s/exception: untangle early machine check handler branch Nicholas Piggin
2019-07-10 15:19 ` [PATCH v2 16/16] powerpc/64s/exception: machine check improve labels and comments Nicholas Piggin

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