This is a note to let you know that I've just added the patch titled
powerpc/mm: Switch obsolete dssall to .long
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-mm-switch-obsolete-dssall-to-.long.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d51f86cfd8e378d4907958db77da3074f6dce3ba Mon Sep 17 00:00:00 2001
From: Alexey Kardashevskiy <aik@xxxxxxxxx>
Date: Tue, 21 Dec 2021 16:59:03 +1100
Subject: powerpc/mm: Switch obsolete dssall to .long
From: Alexey Kardashevskiy <aik@xxxxxxxxx>
commit d51f86cfd8e378d4907958db77da3074f6dce3ba upstream.
The dssall ("Data Stream Stop All") instruction is obsolete altogether
with other Data Cache Instructions since ISA 2.03 (year 2006).
LLVM IAS does not support it but PPC970 seems to be using it.
This switches dssall to .long as there is no much point in fixing LLVM.
Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20211221055904.555763-6-aik@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/ppc-opcode.h | 2 ++
arch/powerpc/kernel/idle.c | 2 +-
arch/powerpc/kernel/idle_6xx.S | 2 +-
arch/powerpc/kernel/l2cr_6xx.S | 6 +++---
arch/powerpc/kernel/swsusp_32.S | 2 +-
arch/powerpc/kernel/swsusp_asm64.S | 2 +-
arch/powerpc/mm/mmu_context.c | 2 +-
arch/powerpc/platforms/powermac/cache.S | 4 ++--
8 files changed, 12 insertions(+), 10 deletions(-)
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -249,6 +249,7 @@
#define PPC_INST_COPY 0x7c20060c
#define PPC_INST_DCBA 0x7c0005ec
#define PPC_INST_DCBA_MASK 0xfc0007fe
+#define PPC_INST_DSSALL 0x7e00066c
#define PPC_INST_ISEL 0x7c00001e
#define PPC_INST_ISEL_MASK 0xfc00003e
#define PPC_INST_LSWI 0x7c0004aa
@@ -576,6 +577,7 @@
#define PPC_DCBZL(a, b) stringify_in_c(.long PPC_RAW_DCBZL(a, b))
#define PPC_DIVDE(t, a, b) stringify_in_c(.long PPC_RAW_DIVDE(t, a, b))
#define PPC_DIVDEU(t, a, b) stringify_in_c(.long PPC_RAW_DIVDEU(t, a, b))
+#define PPC_DSSALL stringify_in_c(.long PPC_INST_DSSALL)
#define PPC_LQARX(t, a, b, eh) stringify_in_c(.long PPC_RAW_LQARX(t, a, b, eh))
#define PPC_STQCX(t, a, b) stringify_in_c(.long PPC_RAW_STQCX(t, a, b))
#define PPC_MADDHD(t, a, b, c) stringify_in_c(.long PPC_RAW_MADDHD(t, a, b, c))
--- a/arch/powerpc/kernel/idle.c
+++ b/arch/powerpc/kernel/idle.c
@@ -82,7 +82,7 @@ void power4_idle(void)
return;
if (cpu_has_feature(CPU_FTR_ALTIVEC))
- asm volatile("DSSALL ; sync" ::: "memory");
+ asm volatile(PPC_DSSALL " ; sync" ::: "memory");
power4_idle_nap();
--- a/arch/powerpc/kernel/idle_6xx.S
+++ b/arch/powerpc/kernel/idle_6xx.S
@@ -129,7 +129,7 @@ BEGIN_FTR_SECTION
END_FTR_SECTION_IFCLR(CPU_FTR_NO_DPM)
mtspr SPRN_HID0,r4
BEGIN_FTR_SECTION
- DSSALL
+ PPC_DSSALL
sync
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
lwz r8,TI_LOCAL_FLAGS(r2) /* set napping bit */
--- a/arch/powerpc/kernel/l2cr_6xx.S
+++ b/arch/powerpc/kernel/l2cr_6xx.S
@@ -96,7 +96,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_L2CR)
/* Stop DST streams */
BEGIN_FTR_SECTION
- DSSALL
+ PPC_DSSALL
sync
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
@@ -292,7 +292,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_L3CR)
isync
/* Stop DST streams */
- DSSALL
+ PPC_DSSALL
sync
/* Get the current enable bit of the L3CR into r4 */
@@ -401,7 +401,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_L3CR)
_GLOBAL(__flush_disable_L1)
/* Stop pending alitvec streams and memory accesses */
BEGIN_FTR_SECTION
- DSSALL
+ PPC_DSSALL
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
sync
--- a/arch/powerpc/kernel/swsusp_32.S
+++ b/arch/powerpc/kernel/swsusp_32.S
@@ -181,7 +181,7 @@ _GLOBAL(swsusp_arch_resume)
#ifdef CONFIG_ALTIVEC
/* Stop pending alitvec streams and memory accesses */
BEGIN_FTR_SECTION
- DSSALL
+ PPC_DSSALL
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
#endif
sync
--- a/arch/powerpc/kernel/swsusp_asm64.S
+++ b/arch/powerpc/kernel/swsusp_asm64.S
@@ -142,7 +142,7 @@ END_FW_FTR_SECTION_IFCLR(FW_FEATURE_LPAR
_GLOBAL(swsusp_arch_resume)
/* Stop pending alitvec streams and memory accesses */
BEGIN_FTR_SECTION
- DSSALL
+ PPC_DSSALL
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
sync
--- a/arch/powerpc/mm/mmu_context.c
+++ b/arch/powerpc/mm/mmu_context.c
@@ -81,7 +81,7 @@ void switch_mm_irqs_off(struct mm_struct
* context
*/
if (cpu_has_feature(CPU_FTR_ALTIVEC))
- asm volatile ("dssall");
+ asm volatile (PPC_DSSALL);
if (!new_on_cpu)
membarrier_arch_switch_mm(prev, next, tsk);
--- a/arch/powerpc/platforms/powermac/cache.S
+++ b/arch/powerpc/platforms/powermac/cache.S
@@ -48,7 +48,7 @@ flush_disable_75x:
/* Stop DST streams */
BEGIN_FTR_SECTION
- DSSALL
+ PPC_DSSALL
sync
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
@@ -197,7 +197,7 @@ flush_disable_745x:
isync
/* Stop prefetch streams */
- DSSALL
+ PPC_DSSALL
sync
/* Disable L2 prefetching */
Patches currently in stable-queue which might be from aik@xxxxxxxxx are
queue-5.15/powerpc-mm-switch-obsolete-dssall-to-.long.patch
