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powerpc: Remove IBM405 Erratum #77 

This erratum is dedicated to IBM 405GP and STB03xxx
which are now gone.

Remove this erratum.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/44dbc08e9034681eb28324cbabc086e97044c36c.1590079969.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2020-05-21 16:56:02 +00:00 committed by Michael Ellerman
parent 59fb463b48
commit 455531e9d8
10 changed files with 0 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
arch/powerpc/include/asm/asm-405.h
View File

@ -1,19 +0,0 @@
#ifndef _ASM_POWERPC_ASM_405_H
#define _ASM_POWERPC_ASM_405_H
#include <asm/asm-const.h>
#ifdef __KERNEL__
#ifdef CONFIG_IBM405_ERR77
/* Erratum #77 on the 405 means we need a sync or dcbt before every
* stwcx. The old ATOMIC_SYNC_FIX covered some but not all of this.
*/
#define PPC405_ERR77(ra,rb) stringify_in_c(dcbt ra, rb;)
#define PPC405_ERR77_SYNC stringify_in_c(sync;)
#else
#define PPC405_ERR77(ra,rb)
#define PPC405_ERR77_SYNC
#endif
#endif
#endif /* _ASM_POWERPC_ASM_405_H */

11
arch/powerpc/include/asm/atomic.h
View File

@ -10,7 +10,6 @@
#include <linux/types.h>
#include <asm/cmpxchg.h>
#include <asm/barrier.h>
#include <asm/asm-405.h>
#define ATOMIC_INIT(i) { (i) }
@ -47,7 +46,6 @@ static __inline__ void atomic_##op(int a, atomic_t *v) \
__asm__ __volatile__( \
"1: lwarx %0,0,%3 # atomic_" #op "\n" \
#asm_op " %0,%2,%0\n" \
PPC405_ERR77(0,%3) \
" stwcx. %0,0,%3 \n" \
" bne- 1b\n" \
: "=&r" (t), "+m" (v->counter) \
@ -63,7 +61,6 @@ static inline int atomic_##op##_return_relaxed(int a, atomic_t *v) \
__asm__ __volatile__( \
"1: lwarx %0,0,%3 # atomic_" #op "_return_relaxed\n" \
#asm_op " %0,%2,%0\n" \
PPC405_ERR77(0, %3) \
" stwcx. %0,0,%3\n" \
" bne- 1b\n" \
: "=&r" (t), "+m" (v->counter) \
@ -81,7 +78,6 @@ static inline int atomic_fetch_##op##_relaxed(int a, atomic_t *v) \
__asm__ __volatile__( \
"1: lwarx %0,0,%4 # atomic_fetch_" #op "_relaxed\n" \
#asm_op " %1,%3,%0\n" \
PPC405_ERR77(0, %4) \
" stwcx. %1,0,%4\n" \
" bne- 1b\n" \
: "=&r" (res), "=&r" (t), "+m" (v->counter) \
@ -130,7 +126,6 @@ static __inline__ void atomic_inc(atomic_t *v)
__asm__ __volatile__(
"1: lwarx %0,0,%2 # atomic_inc\n\
addic %0,%0,1\n"
PPC405_ERR77(0,%2)
" stwcx. %0,0,%2 \n\
bne- 1b"
: "=&r" (t), "+m" (v->counter)
@ -146,7 +141,6 @@ static __inline__ int atomic_inc_return_relaxed(atomic_t *v)
__asm__ __volatile__(
"1: lwarx %0,0,%2 # atomic_inc_return_relaxed\n"
" addic %0,%0,1\n"
PPC405_ERR77(0, %2)
" stwcx. %0,0,%2\n"
" bne- 1b"
: "=&r" (t), "+m" (v->counter)
@ -163,7 +157,6 @@ static __inline__ void atomic_dec(atomic_t *v)
__asm__ __volatile__(
"1: lwarx %0,0,%2 # atomic_dec\n\
addic %0,%0,-1\n"
PPC405_ERR77(0,%2)\
" stwcx. %0,0,%2\n\
bne- 1b"
: "=&r" (t), "+m" (v->counter)
@ -179,7 +172,6 @@ static __inline__ int atomic_dec_return_relaxed(atomic_t *v)
__asm__ __volatile__(
"1: lwarx %0,0,%2 # atomic_dec_return_relaxed\n"
" addic %0,%0,-1\n"
PPC405_ERR77(0, %2)
" stwcx. %0,0,%2\n"
" bne- 1b"
: "=&r" (t), "+m" (v->counter)
@ -220,7 +212,6 @@ static __inline__ int atomic_fetch_add_unless(atomic_t *v, int a, int u)
cmpw 0,%0,%3 \n\
beq 2f \n\
add %0,%2,%0 \n"
PPC405_ERR77(0,%2)
" stwcx. %0,0,%1 \n\
bne- 1b \n"
PPC_ATOMIC_EXIT_BARRIER
@ -251,7 +242,6 @@ static __inline__ int atomic_inc_not_zero(atomic_t *v)
cmpwi 0,%0,0\n\
beq- 2f\n\
addic %1,%0,1\n"
PPC405_ERR77(0,%2)
" stwcx. %1,0,%2\n\
bne- 1b\n"
PPC_ATOMIC_EXIT_BARRIER
@ -280,7 +270,6 @@ static __inline__ int atomic_dec_if_positive(atomic_t *v)
cmpwi %0,1\n\
addi %0,%0,-1\n\
blt- 2f\n"
PPC405_ERR77(0,%1)
" stwcx. %0,0,%1\n\
bne- 1b"
PPC_ATOMIC_EXIT_BARRIER

4
arch/powerpc/include/asm/bitops.h
View File

@ -41,7 +41,6 @@
#include <linux/compiler.h>
#include <asm/asm-compat.h>
#include <asm/synch.h>
#include <asm/asm-405.h>
/* PPC bit number conversion */
#define PPC_BITLSHIFT(be) (BITS_PER_LONG - 1 - (be))
@ -73,7 +72,6 @@ static inline void fn(unsigned long mask, \
prefix \
"1:" PPC_LLARX(%0,0,%3,0) "\n" \
stringify_in_c(op) "%0,%0,%2\n" \
PPC405_ERR77(0,%3) \
PPC_STLCX "%0,0,%3\n" \
"bne- 1b\n" \
: "=&r" (old), "+m" (*p) \
@ -119,7 +117,6 @@ static inline unsigned long fn( \
prefix \
"1:" PPC_LLARX(%0,0,%3,eh) "\n" \
stringify_in_c(op) "%1,%0,%2\n" \
PPC405_ERR77(0,%3) \
PPC_STLCX "%1,0,%3\n" \
"bne- 1b\n" \
postfix \
@ -175,7 +172,6 @@ clear_bit_unlock_return_word(int nr, volatile unsigned long *addr)
PPC_RELEASE_BARRIER
"1:" PPC_LLARX(%0,0,%3,0) "\n"
"andc %1,%0,%2\n"
PPC405_ERR77(0,%3)
PPC_STLCX "%1,0,%3\n"
"bne- 1b\n"
: "=&r" (old), "=&r" (t)

11
arch/powerpc/include/asm/cmpxchg.h
View File

@ -6,7 +6,6 @@
#include <linux/compiler.h>
#include <asm/synch.h>
#include <linux/bug.h>
#include <asm/asm-405.h>
#ifdef __BIG_ENDIAN
#define BITOFF_CAL(size, off) ((sizeof(u32) - size - off) * BITS_PER_BYTE)
@ -29,7 +28,6 @@ static inline u32 __xchg_##type##sfx(volatile void *p, u32 val) \
"1: lwarx %0,0,%3\n" \
" andc %1,%0,%5\n" \
" or %1,%1,%4\n" \
PPC405_ERR77(0,%3) \
" stwcx. %1,0,%3\n" \
" bne- 1b\n" \
: "=&r" (prev), "=&r" (tmp), "+m" (*(u32*)p) \
@ -60,7 +58,6 @@ u32 __cmpxchg_##type##sfx(volatile void *p, u32 old, u32 new) \
" bne- 2f\n" \
" andc %1,%0,%6\n" \
" or %1,%1,%5\n" \
PPC405_ERR77(0,%3) \
" stwcx. %1,0,%3\n" \
" bne- 1b\n" \
br2 \
@ -92,7 +89,6 @@ __xchg_u32_local(volatile void *p, unsigned long val)
__asm__ __volatile__(
"1: lwarx %0,0,%2 \n"
PPC405_ERR77(0,%2)
" stwcx. %3,0,%2 \n\
bne- 1b"
: "=&r" (prev), "+m" (*(volatile unsigned int *)p)
@ -109,7 +105,6 @@ __xchg_u32_relaxed(u32 *p, unsigned long val)
__asm__ __volatile__(
"1: lwarx %0,0,%2\n"
PPC405_ERR77(0, %2)
" stwcx. %3,0,%2\n"
" bne- 1b"
: "=&r" (prev), "+m" (*p)
@ -127,7 +122,6 @@ __xchg_u64_local(volatile void *p, unsigned long val)
__asm__ __volatile__(
"1: ldarx %0,0,%2 \n"
PPC405_ERR77(0,%2)
" stdcx. %3,0,%2 \n\
bne- 1b"
: "=&r" (prev), "+m" (*(volatile unsigned long *)p)
@ -144,7 +138,6 @@ __xchg_u64_relaxed(u64 *p, unsigned long val)
__asm__ __volatile__(
"1: ldarx %0,0,%2\n"
PPC405_ERR77(0, %2)
" stdcx. %3,0,%2\n"
" bne- 1b"
: "=&r" (prev), "+m" (*p)
@ -229,7 +222,6 @@ __cmpxchg_u32(volatile unsigned int *p, unsigned long old, unsigned long new)
"1: lwarx %0,0,%2 # __cmpxchg_u32\n\
cmpw 0,%0,%3\n\
bne- 2f\n"
PPC405_ERR77(0,%2)
" stwcx. %4,0,%2\n\
bne- 1b"
PPC_ATOMIC_EXIT_BARRIER
@ -252,7 +244,6 @@ __cmpxchg_u32_local(volatile unsigned int *p, unsigned long old,
"1: lwarx %0,0,%2 # __cmpxchg_u32\n\
cmpw 0,%0,%3\n\
bne- 2f\n"
PPC405_ERR77(0,%2)
" stwcx. %4,0,%2\n\
bne- 1b"
"\n\
@ -273,7 +264,6 @@ __cmpxchg_u32_relaxed(u32 *p, unsigned long old, unsigned long new)
"1: lwarx %0,0,%2 # __cmpxchg_u32_relaxed\n"
" cmpw 0,%0,%3\n"
" bne- 2f\n"
PPC405_ERR77(0, %2)
" stwcx. %4,0,%2\n"
" bne- 1b\n"
"2:"
@ -301,7 +291,6 @@ __cmpxchg_u32_acquire(u32 *p, unsigned long old, unsigned long new)
"1: lwarx %0,0,%2 # __cmpxchg_u32_acquire\n"
" cmpw 0,%0,%3\n"
" bne- 2f\n"
PPC405_ERR77(0, %2)
" stwcx. %4,0,%2\n"
" bne- 1b\n"
PPC_ACQUIRE_BARRIER

3
arch/powerpc/include/asm/futex.h
View File

@ -8,14 +8,12 @@
#include <linux/uaccess.h>
#include <asm/errno.h>
#include <asm/synch.h>
#include <asm/asm-405.h>
#define __futex_atomic_op(insn, ret, oldval, uaddr, oparg) \
__asm__ __volatile ( \
PPC_ATOMIC_ENTRY_BARRIER \
"1: lwarx %0,0,%2\n" \
insn \
PPC405_ERR77(0, %2) \
"2: stwcx. %1,0,%2\n" \
"bne- 1b\n" \
PPC_ATOMIC_EXIT_BARRIER \
@ -82,7 +80,6 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
"1: lwarx %1,0,%3 # futex_atomic_cmpxchg_inatomic\n\
cmpw 0,%1,%4\n\
bne- 3f\n"
PPC405_ERR77(0,%3)
"2: stwcx. %5,0,%3\n\
bne- 1b\n"
PPC_ATOMIC_EXIT_BARRIER

1
arch/powerpc/include/asm/nohash/32/pgtable.h
View File

@ -9,7 +9,6 @@
#include <linux/sched.h>
#include <linux/threads.h>
#include <asm/mmu.h> /* For sub-arch specific PPC_PIN_SIZE */
#include <asm/asm-405.h>
#ifdef CONFIG_44x
extern int icache_44x_need_flush;

4
arch/powerpc/include/asm/spinlock.h
View File

@ -23,7 +23,6 @@
#endif
#include <asm/synch.h>
#include <asm/ppc-opcode.h>
#include <asm/asm-405.h>
#ifdef CONFIG_PPC64
/* use 0x800000yy when locked, where yy == CPU number */
@ -210,7 +209,6 @@ static inline long __arch_read_trylock(arch_rwlock_t *rw)
__DO_SIGN_EXTEND
" addic. %0,%0,1\n\
ble- 2f\n"
PPC405_ERR77(0,%1)
" stwcx. %0,0,%1\n\
bne- 1b\n"
PPC_ACQUIRE_BARRIER
@ -234,7 +232,6 @@ static inline long __arch_write_trylock(arch_rwlock_t *rw)
"1: " PPC_LWARX(%0,0,%2,1) "\n\
cmpwi 0,%0,0\n\
bne- 2f\n"
PPC405_ERR77(0,%1)
" stwcx. %1,0,%2\n\
bne- 1b\n"
PPC_ACQUIRE_BARRIER
@ -292,7 +289,6 @@ static inline void arch_read_unlock(arch_rwlock_t *rw)
PPC_RELEASE_BARRIER
"1: lwarx %0,0,%1\n\
addic %0,%0,-1\n"
PPC405_ERR77(0,%1)
" stwcx. %0,0,%1\n\
bne- 1b"
: "=&r"(tmp)

11
arch/powerpc/kernel/entry_32.S
View File

@ -28,7 +28,6 @@
#include <asm/unistd.h>
#include <asm/ptrace.h>
#include <asm/export.h>
#include <asm/asm-405.h>
#include <asm/feature-fixups.h>
#include <asm/barrier.h>
#include <asm/kup.h>
@ -541,9 +540,6 @@ syscall_exit_work:
addi r12,r2,TI_FLAGS
3: lwarx r8,0,r12
andc r8,r8,r11
#ifdef CONFIG_IBM405_ERR77
dcbt 0,r12
#endif
stwcx. r8,0,r12
bne- 3b
@ -918,9 +914,6 @@ resume_kernel:
addi r5,r2,TI_FLAGS
0: lwarx r8,0,r5
andc r8,r8,r11
#ifdef CONFIG_IBM405_ERR77
dcbt 0,r5
#endif
stwcx. r8,0,r5
bne- 0b
1:
@ -997,7 +990,6 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_47x)
mtspr SPRN_XER,r10
mtctr r11
PPC405_ERR77(0,r1)
BEGIN_FTR_SECTION
lwarx r11,0,r1
END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
@ -1066,7 +1058,6 @@ exc_exit_start:
lwz r1,GPR1(r1)
.globl exc_exit_restart_end
exc_exit_restart_end:
PPC405_ERR77_SYNC
rfi
b . /* prevent prefetch past rfi */
@ -1109,7 +1100,6 @@ exc_exit_restart_end:
lwz r11,_CTR(r1); \
mtspr SPRN_XER,r10; \
mtctr r11; \
PPC405_ERR77(0,r1); \
stwcx. r0,0,r1; /* to clear the reservation */ \
lwz r11,_LINK(r1); \
mtlr r11; \
@ -1129,7 +1119,6 @@ exc_exit_restart_end:
lwz r10,GPR10(r1); \
lwz r11,GPR11(r1); \
lwz r1,GPR1(r1); \
PPC405_ERR77_SYNC; \
exc_lvl_rfi; \
b .; /* prevent prefetch past exc_lvl_rfi */

3
arch/powerpc/kernel/head_40x.S
View File

@ -36,7 +36,6 @@
#include <asm/asm-offsets.h>
#include <asm/ptrace.h>
#include <asm/export.h>
#include <asm/asm-405.h>
#include "head_32.h"
@ -487,7 +486,6 @@ _ENTRY(saved_ksp_limit)
lwz r12,GPR12(r11)
lwz r10,crit_r10@l(0)
lwz r11,crit_r11@l(0)
PPC405_ERR77_SYNC
rfci
b .
@ -569,7 +567,6 @@ finish_tlb_load:
mfspr r12, SPRN_SPRG_SCRATCH3
mfspr r11, SPRN_SPRG_SCRATCH1
mfspr r10, SPRN_SPRG_SCRATCH0
PPC405_ERR77_SYNC
rfi /* Should sync shadow TLBs */
b . /* prevent prefetch past rfi */

6
arch/powerpc/platforms/40x/Kconfig
View File

@ -69,12 +69,6 @@ config PPC4xx_GPIO
help
Enable gpiolib support for ppc40x based boards
# 40x errata/workaround config symbols, selected by the CPU models above
# All 405-based cores up until the 405GPR and 405EP have this errata.
config IBM405_ERR77
bool
config APM8018X
bool "APM8018X"
depends on 40x