On the Loongson-2G/2H/3A/3B there is a hardware flaw that ll/sc and
lld/scd is very weak ordering. We should add sync instructions before
each ll/lld and after the last sc/scd to workaround. Otherwise, this
flaw will cause deadlock occationally (e.g. when doing heavy load test
with LTP).
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
---
arch/mips/include/asm/atomic.h | 107 ++++++++++
arch/mips/include/asm/bitops.h | 273 +++++++++++++++++++------
arch/mips/include/asm/cmpxchg.h | 54 +++++
arch/mips/include/asm/edac.h | 33 ++-
arch/mips/include/asm/futex.h | 62 ++++++
arch/mips/include/asm/local.h | 34 +++
arch/mips/include/asm/mach-cavium-octeon/war.h | 1 +
arch/mips/include/asm/mach-generic/war.h | 1 +
arch/mips/include/asm/mach-ip22/war.h | 1 +
arch/mips/include/asm/mach-ip27/war.h | 1 +
arch/mips/include/asm/mach-ip28/war.h | 1 +
arch/mips/include/asm/mach-ip32/war.h | 1 +
arch/mips/include/asm/mach-loongson64/war.h | 26 +++
arch/mips/include/asm/mach-malta/war.h | 1 +
arch/mips/include/asm/mach-pmcs-msp71xx/war.h | 1 +
arch/mips/include/asm/mach-rc32434/war.h | 1 +
arch/mips/include/asm/mach-rm/war.h | 1 +
arch/mips/include/asm/mach-sibyte/war.h | 1 +
arch/mips/include/asm/mach-tx49xx/war.h | 1 +
arch/mips/include/asm/pgtable.h | 19 ++
arch/mips/include/asm/spinlock.h | 142 +++++++++++++
arch/mips/include/asm/war.h | 8 +
arch/mips/kernel/syscall.c | 34 +++
arch/mips/loongson64/Platform | 3 +
arch/mips/mm/tlbex.c | 17 ++
25 files changed, 757 insertions(+), 67 deletions(-)
create mode 100644 arch/mips/include/asm/mach-loongson64/war.h
diff --git a/arch/mips/include/asm/atomic.h b/arch/mips/include/asm/atomic.h
index 0ab176b..e0002c58 100644
--- a/arch/mips/include/asm/atomic.h
+++ b/arch/mips/include/asm/atomic.h
@@ -56,6 +56,22 @@ static __inline__ void atomic_##op(int i, atomic_t * v) \
" .set mips0 \n" \
: "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (v->counter) \
: "Ir" (i)); \
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) { \
+ int temp; \
+ \
+ do { \
+ __asm__ __volatile__( \
+ " .set "MIPS_ISA_LEVEL" \n" \
+ __WEAK_LLSC_MB \
+ " ll %0, %1 # atomic_" #op "\n" \
+ " " #asm_op " %0, %2 \n" \
+ " sc %0, %1 \n" \
+ " .set mips0 \n" \
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (v->counter) \
+ : "Ir" (i)); \
+ } while (unlikely(!temp)); \
+ \
+ smp_llsc_mb(); \
} else if (kernel_uses_llsc) { \
int temp; \
\
@@ -97,6 +113,23 @@ static __inline__ int atomic_##op##_return_relaxed(int i, atomic_t * v) \
: "=&r" (result), "=&r" (temp), \
"+" GCC_OFF_SMALL_ASM() (v->counter) \
: "Ir" (i)); \
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) { \
+ int temp; \
+ \
+ do { \
+ __asm__ __volatile__( \
+ " .set "MIPS_ISA_LEVEL" \n" \
+ __WEAK_LLSC_MB \
+ " ll %1, %2 # atomic_" #op "_return \n" \
+ " " #asm_op " %0, %1, %3 \n" \
+ " sc %0, %2 \n" \
+ " .set mips0 \n" \
+ : "=&r" (result), "=&r" (temp), \
+ "+" GCC_OFF_SMALL_ASM() (v->counter) \
+ : "Ir" (i)); \
+ } while (unlikely(!result)); \
+ \
+ result = temp; result c_op i; \
} else if (kernel_uses_llsc) { \
int temp; \
\
@@ -237,6 +270,26 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
"+" GCC_OFF_SMALL_ASM() (v->counter)
: "Ir" (i), GCC_OFF_SMALL_ASM() (v->counter)
: "memory");
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ int temp;
+
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_LEVEL" \n"
+ "1: # atomic_sub_if_positive\n"
+ __WEAK_LLSC_MB
+ " ll %1, %2 \n"
+ " subu %0, %1, %3 \n"
+ " bltz %0, 1f \n"
+ " sc %0, %2 \n"
+ " .set noreorder \n"
+ " beqz %0, 1b \n"
+ " subu %0, %1, %3 \n"
+ " .set reorder \n"
+ "1: \n"
+ " .set mips0 \n"
+ : "=&r" (result), "=&r" (temp),
+ "+" GCC_OFF_SMALL_ASM() (v->counter)
+ : "Ir" (i));
} else if (kernel_uses_llsc) {
int temp;
@@ -398,6 +451,22 @@ static __inline__ void atomic64_##op(long i, atomic64_t * v) \
" .set mips0 \n" \
: "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (v->counter) \
: "Ir" (i)); \
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) { \
+ long temp; \
+ \
+ do { \
+ __asm__ __volatile__( \
+ " .set "MIPS_ISA_LEVEL" \n" \
+ __WEAK_LLSC_MB \
+ " lld %0, %1 # atomic64_" #op "\n" \
+ " " #asm_op " %0, %2 \n" \
+ " scd %0, %1 \n" \
+ " .set mips0 \n" \
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (v->counter) \
+ : "Ir" (i)); \
+ } while (unlikely(!temp)); \
+ \
+ smp_llsc_mb(); \
} else if (kernel_uses_llsc) { \
long temp; \
\
@@ -439,6 +508,24 @@ static __inline__ long atomic64_##op##_return_relaxed(long i, atomic64_t * v) \
: "=&r" (result), "=&r" (temp), \
"+" GCC_OFF_SMALL_ASM() (v->counter) \
: "Ir" (i)); \
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) { \
+ long temp; \
+ \
+ do { \
+ __asm__ __volatile__( \
+ " .set "MIPS_ISA_LEVEL" \n" \
+ __WEAK_LLSC_MB \
+ " lld %1, %2 # atomic64_" #op "_return\n" \
+ " " #asm_op " %0, %1, %3 \n" \
+ " scd %0, %2 \n" \
+ " .set mips0 \n" \
+ : "=&r" (result), "=&r" (temp), \
+ "=" GCC_OFF_SMALL_ASM() (v->counter) \
+ : "Ir" (i), GCC_OFF_SMALL_ASM() (v->counter) \
+ : "memory"); \
+ } while (unlikely(!result)); \
+ \
+ result = temp; result c_op i; \
} else if (kernel_uses_llsc) { \
long temp; \
\
@@ -582,6 +669,26 @@ static __inline__ long atomic64_sub_if_positive(long i, atomic64_t * v)
"=" GCC_OFF_SMALL_ASM() (v->counter)
: "Ir" (i), GCC_OFF_SMALL_ASM() (v->counter)
: "memory");
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ long temp;
+
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_LEVEL" \n"
+ "1: # atomic64_sub_if_positive\n"
+ __WEAK_LLSC_MB
+ " lld %1, %2 \n"
+ " dsubu %0, %1, %3 \n"
+ " bltz %0, 1f \n"
+ " scd %0, %2 \n"
+ " .set noreorder \n"
+ " beqz %0, 1b \n"
+ " dsubu %0, %1, %3 \n"
+ " .set reorder \n"
+ "1: \n"
+ " .set mips0 \n"
+ : "=&r" (result), "=&r" (temp),
+ "+" GCC_OFF_SMALL_ASM() (v->counter)
+ : "Ir" (i));
} else if (kernel_uses_llsc) {
long temp;
diff --git a/arch/mips/include/asm/bitops.h b/arch/mips/include/asm/bitops.h
index fa57cef..6bef54a 100644
--- a/arch/mips/include/asm/bitops.h
+++ b/arch/mips/include/asm/bitops.h
@@ -68,26 +68,54 @@ static inline void set_bit(unsigned long nr, volatile unsigned long *addr)
: "ir" (1UL << bit), GCC_OFF_SMALL_ASM() (*m));
#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
} else if (kernel_uses_llsc && __builtin_constant_p(bit)) {
- do {
- __asm__ __volatile__(
- " " __LL "%0, %1 # set_bit \n"
- " " __INS "%0, %3, %2, 1 \n"
- " " __SC "%0, %1 \n"
- : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
- : "ir" (bit), "r" (~0));
- } while (unlikely(!temp));
+ if (LOONGSON_LLSC_WAR) {
+ do {
+ __asm__ __volatile__(
+ __WEAK_LLSC_MB
+ " " __LL "%0, %1 # set_bit \n"
+ " " __INS "%0, %3, %2, 1 \n"
+ " " __SC "%0, %1 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
+ : "ir" (bit), "r" (~0));
+ } while (unlikely(!temp));
+ smp_llsc_mb();
+ } else {
+ do {
+ __asm__ __volatile__(
+ " " __LL "%0, %1 # set_bit \n"
+ " " __INS "%0, %3, %2, 1 \n"
+ " " __SC "%0, %1 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
+ : "ir" (bit), "r" (~0));
+ } while (unlikely(!temp));
+ }
#endif /* CONFIG_CPU_MIPSR2 || CONFIG_CPU_MIPSR6 */
} else if (kernel_uses_llsc) {
- do {
- __asm__ __volatile__(
- " .set "MIPS_ISA_ARCH_LEVEL" \n"
- " " __LL "%0, %1 # set_bit \n"
- " or %0, %2 \n"
- " " __SC "%0, %1 \n"
- " .set mips0 \n"
- : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
- : "ir" (1UL << bit));
- } while (unlikely(!temp));
+ if (LOONGSON_LLSC_WAR) {
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ __WEAK_LLSC_MB
+ " " __LL "%0, %1 # set_bit \n"
+ " or %0, %2 \n"
+ " " __SC "%0, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
+ : "ir" (1UL << bit));
+ } while (unlikely(!temp));
+ smp_llsc_mb();
+ } else {
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ " " __LL "%0, %1 # set_bit \n"
+ " or %0, %2 \n"
+ " " __SC "%0, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
+ : "ir" (1UL << bit));
+ } while (unlikely(!temp));
+ }
} else
__mips_set_bit(nr, addr);
}
@@ -120,26 +148,54 @@ static inline void clear_bit(unsigned long nr, volatile unsigned long *addr)
: "ir" (~(1UL << bit)));
#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6)
} else if (kernel_uses_llsc && __builtin_constant_p(bit)) {
- do {
- __asm__ __volatile__(
- " " __LL "%0, %1 # clear_bit \n"
- " " __INS "%0, $0, %2, 1 \n"
- " " __SC "%0, %1 \n"
- : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
- : "ir" (bit));
- } while (unlikely(!temp));
+ if (LOONGSON_LLSC_WAR) {
+ do {
+ __asm__ __volatile__(
+ __WEAK_LLSC_MB
+ " " __LL "%0, %1 # clear_bit \n"
+ " " __INS "%0, $0, %2, 1 \n"
+ " " __SC "%0, %1 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
+ : "ir" (bit));
+ } while (unlikely(!temp));
+ smp_llsc_mb();
+ } else {
+ do {
+ __asm__ __volatile__(
+ " " __LL "%0, %1 # clear_bit \n"
+ " " __INS "%0, $0, %2, 1 \n"
+ " " __SC "%0, %1 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
+ : "ir" (bit));
+ } while (unlikely(!temp));
+ }
#endif /* CONFIG_CPU_MIPSR2 || CONFIG_CPU_MIPSR6 */
} else if (kernel_uses_llsc) {
- do {
- __asm__ __volatile__(
- " .set "MIPS_ISA_ARCH_LEVEL" \n"
- " " __LL "%0, %1 # clear_bit \n"
- " and %0, %2 \n"
- " " __SC "%0, %1 \n"
- " .set mips0 \n"
- : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
- : "ir" (~(1UL << bit)));
- } while (unlikely(!temp));
+ if (LOONGSON_LLSC_WAR) {
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ __WEAK_LLSC_MB
+ " " __LL "%0, %1 # clear_bit \n"
+ " and %0, %2 \n"
+ " " __SC "%0, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
+ : "ir" (~(1UL << bit)));
+ } while (unlikely(!temp));
+ smp_llsc_mb();
+ } else {
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ " " __LL "%0, %1 # clear_bit \n"
+ " and %0, %2 \n"
+ " " __SC "%0, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
+ : "ir" (~(1UL << bit)));
+ } while (unlikely(!temp));
+ }
} else
__mips_clear_bit(nr, addr);
}
@@ -184,6 +240,23 @@ static inline void change_bit(unsigned long nr, volatile unsigned long *addr)
" .set mips0 \n"
: "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
: "ir" (1UL << bit));
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
+ unsigned long temp;
+
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ __WEAK_LLSC_MB
+ " " __LL "%0, %1 # change_bit \n"
+ " xor %0, %2 \n"
+ " " __SC "%0, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m)
+ : "ir" (1UL << bit));
+ } while (unlikely(!temp));
+
+ smp_llsc_mb();
} else if (kernel_uses_llsc) {
unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
unsigned long temp;
@@ -233,6 +306,24 @@ static inline int test_and_set_bit(unsigned long nr,
: "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
: "r" (1UL << bit)
: "memory");
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
+ unsigned long temp;
+
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ __WEAK_LLSC_MB
+ " " __LL "%0, %1 # test_and_set_bit \n"
+ " or %2, %0, %3 \n"
+ " " __SC "%2, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
+ : "r" (1UL << bit)
+ : "memory");
+ } while (unlikely(!res));
+
+ res = temp & (1UL << bit);
} else if (kernel_uses_llsc) {
unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
unsigned long temp;
@@ -287,6 +378,24 @@ static inline int test_and_set_bit_lock(unsigned long nr,
: "=&r" (temp), "+m" (*m), "=&r" (res)
: "r" (1UL << bit)
: "memory");
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
+ unsigned long temp;
+
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ __WEAK_LLSC_MB
+ " " __LL "%0, %1 # test_and_set_bit \n"
+ " or %2, %0, %3 \n"
+ " " __SC "%2, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
+ : "r" (1UL << bit)
+ : "memory");
+ } while (unlikely(!res));
+
+ res = temp & (1UL << bit);
} else if (kernel_uses_llsc) {
unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
unsigned long temp;
@@ -348,33 +457,63 @@ static inline int test_and_clear_bit(unsigned long nr,
unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
unsigned long temp;
- do {
- __asm__ __volatile__(
- " " __LL "%0, %1 # test_and_clear_bit \n"
- " " __EXT "%2, %0, %3, 1 \n"
- " " __INS "%0, $0, %3, 1 \n"
- " " __SC "%0, %1 \n"
- : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
- : "ir" (bit)
- : "memory");
- } while (unlikely(!temp));
+ if (LOONGSON_LLSC_WAR) {
+ do {
+ __asm__ __volatile__(
+ __WEAK_LLSC_MB
+ " " __LL "%0, %1 # test_and_clear_bit \n"
+ " " __EXT "%2, %0, %3, 1 \n"
+ " " __INS "%0, $0, %3, 1 \n"
+ " " __SC "%0, %1 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
+ : "ir" (bit)
+ : "memory");
+ } while (unlikely(!temp));
+ } else {
+ do {
+ __asm__ __volatile__(
+ " " __LL "%0, %1 # test_and_clear_bit \n"
+ " " __EXT "%2, %0, %3, 1 \n"
+ " " __INS "%0, $0, %3, 1 \n"
+ " " __SC "%0, %1 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
+ : "ir" (bit)
+ : "memory");
+ } while (unlikely(!temp));
+ }
#endif
} else if (kernel_uses_llsc) {
unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
unsigned long temp;
- do {
- __asm__ __volatile__(
- " .set "MIPS_ISA_ARCH_LEVEL" \n"
- " " __LL "%0, %1 # test_and_clear_bit \n"
- " or %2, %0, %3 \n"
- " xor %2, %3 \n"
- " " __SC "%2, %1 \n"
- " .set mips0 \n"
- : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
- : "r" (1UL << bit)
- : "memory");
- } while (unlikely(!res));
+ if (LOONGSON_LLSC_WAR) {
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ __WEAK_LLSC_MB
+ " " __LL "%0, %1 # test_and_clear_bit \n"
+ " or %2, %0, %3 \n"
+ " xor %2, %3 \n"
+ " " __SC "%2, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
+ : "r" (1UL << bit)
+ : "memory");
+ } while (unlikely(!res));
+ } else {
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ " " __LL "%0, %1 # test_and_clear_bit \n"
+ " or %2, %0, %3 \n"
+ " xor %2, %3 \n"
+ " " __SC "%2, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
+ : "r" (1UL << bit)
+ : "memory");
+ } while (unlikely(!res));
+ }
res = temp & (1UL << bit);
} else
@@ -416,6 +555,24 @@ static inline int test_and_change_bit(unsigned long nr,
: "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
: "r" (1UL << bit)
: "memory");
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
+ unsigned long temp;
+
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ __WEAK_LLSC_MB
+ " " __LL "%0, %1 # test_and_change_bit \n"
+ " xor %2, %0, %3 \n"
+ " " __SC "\t%2, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "+" GCC_OFF_SMALL_ASM() (*m), "=&r" (res)
+ : "r" (1UL << bit)
+ : "memory");
+ } while (unlikely(!res));
+
+ res = temp & (1UL << bit);
} else if (kernel_uses_llsc) {
unsigned long *m = ((unsigned long *) addr) + (nr >> SZLONG_LOG);
unsigned long temp;
diff --git a/arch/mips/include/asm/cmpxchg.h b/arch/mips/include/asm/cmpxchg.h
index b71ab4a..5bfd70d 100644
--- a/arch/mips/include/asm/cmpxchg.h
+++ b/arch/mips/include/asm/cmpxchg.h
@@ -34,6 +34,24 @@ static inline unsigned long __xchg_u32(volatile int * m, unsigned int val)
: "=&r" (retval), "=" GCC_OFF_SMALL_ASM() (*m), "=&r" (dummy)
: GCC_OFF_SMALL_ASM() (*m), "Jr" (val)
: "memory");
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ unsigned long dummy;
+
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ __WEAK_LLSC_MB
+ " ll %0, %3 # xchg_u32 \n"
+ " .set mips0 \n"
+ " move %2, %z4 \n"
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ " sc %2, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (retval), "=" GCC_OFF_SMALL_ASM() (*m),
+ "=&r" (dummy)
+ : GCC_OFF_SMALL_ASM() (*m), "Jr" (val)
+ : "memory");
+ } while (unlikely(!dummy));
} else if (kernel_uses_llsc) {
unsigned long dummy;
@@ -85,6 +103,22 @@ static inline __u64 __xchg_u64(volatile __u64 * m, __u64 val)
: "=&r" (retval), "=" GCC_OFF_SMALL_ASM() (*m), "=&r" (dummy)
: GCC_OFF_SMALL_ASM() (*m), "Jr" (val)
: "memory");
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ unsigned long dummy;
+
+ do {
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ __WEAK_LLSC_MB
+ " lld %0, %3 # xchg_u64 \n"
+ " move %2, %z4 \n"
+ " scd %2, %1 \n"
+ " .set mips0 \n"
+ : "=&r" (retval), "=" GCC_OFF_SMALL_ASM() (*m),
+ "=&r" (dummy)
+ : GCC_OFF_SMALL_ASM() (*m), "Jr" (val)
+ : "memory");
+ } while (unlikely(!dummy));
} else if (kernel_uses_llsc) {
unsigned long dummy;
@@ -159,6 +193,26 @@ static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int siz
: "=&r" (__ret), "=" GCC_OFF_SMALL_ASM() (*m) \
: GCC_OFF_SMALL_ASM() (*m), "Jr" (old), "Jr" (new) \
: "memory"); \
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) { \
+ __asm__ __volatile__( \
+ " .set push \n" \
+ " .set noat \n" \
+ " .set "MIPS_ISA_ARCH_LEVEL" \n" \
+ "1: # __cmpxchg_asm \n" \
+ __WEAK_LLSC_MB \
+ " " ld " %0, %2 \n" \
+ " bne %0, %z3, 2f \n" \
+ " .set mips0 \n" \
+ " move $1, %z4 \n" \
+ " .set "MIPS_ISA_ARCH_LEVEL" \n" \
+ " " st " $1, %1 \n" \
+ " beqz $1, 1b \n" \
+ " .set pop \n" \
+ "2: \n" \
+ __WEAK_LLSC_MB \
+ : "=&r" (__ret), "=" GCC_OFF_SMALL_ASM() (*m) \
+ : GCC_OFF_SMALL_ASM() (*m), "Jr" (old), "Jr" (new) \
+ : "memory"); \
} else if (kernel_uses_llsc) { \
__asm__ __volatile__( \
" .set push \n" \
diff --git a/arch/mips/include/asm/edac.h b/arch/mips/include/asm/edac.h
index 980b165..a864aa9 100644
--- a/arch/mips/include/asm/edac.h
+++ b/arch/mips/include/asm/edac.h
@@ -19,15 +19,30 @@ static inline void edac_atomic_scrub(void *va, u32 size)
* Intel: asm("lock; addl $0, %0"::"m"(*virt_addr));
*/
- __asm__ __volatile__ (
- " .set mips2 \n"
- "1: ll %0, %1 # edac_atomic_scrub \n"
- " addu %0, $0 \n"
- " sc %0, %1 \n"
- " beqz %0, 1b \n"
- " .set mips0 \n"
- : "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
- : GCC_OFF_SMALL_ASM() (*virt_addr));
+ if (LOONGSON_LLSC_WAR) {
+ __asm__ __volatile__ (
+ " .set mips2 \n"
+ "1: # edac_atomic_scrub \n"
+ __WEAK_LLSC_MB
+ " ll %0, %1 \n"
+ " addu %0, $0 \n"
+ " sc %0, %1 \n"
+ " beqz %0, 1b \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
+ : GCC_OFF_SMALL_ASM() (*virt_addr));
+ smp_llsc_mb();
+ } else {
+ __asm__ __volatile__ (
+ " .set mips2 \n"
+ "1: ll %0, %1 # edac_atomic_scrub \n"
+ " addu %0, $0 \n"
+ " sc %0, %1 \n"
+ " beqz %0, 1b \n"
+ " .set mips0 \n"
+ : "=&r" (temp), "=" GCC_OFF_SMALL_ASM() (*virt_addr)
+ : GCC_OFF_SMALL_ASM() (*virt_addr));
+ }
virt_addr++;
}
diff --git a/arch/mips/include/asm/futex.h b/arch/mips/include/asm/futex.h
index 1de190b..3e2741f 100644
--- a/arch/mips/include/asm/futex.h
+++ b/arch/mips/include/asm/futex.h
@@ -49,6 +49,37 @@
: "0" (0), GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oparg), \
"i" (-EFAULT) \
: "memory"); \
+ } else if (cpu_has_llsc && LOONGSON_LLSC_WAR) { \
+ __asm__ __volatile__( \
+ " .set push \n" \
+ " .set noat \n" \
+ " .set "MIPS_ISA_ARCH_LEVEL" \n" \
+ "1: # __futex_atomic_op\n" \
+ __WEAK_LLSC_MB \
+ " "user_ll("%1", "%4")" \n" \
+ " .set mips0 \n" \
+ " " insn " \n" \
+ " .set "MIPS_ISA_ARCH_LEVEL" \n" \
+ "2: "user_sc("$1", "%2")" \n" \
+ " beqz $1, 1b \n" \
+ __WEAK_LLSC_MB \
+ "3: \n" \
+ " .insn \n" \
+ " .set pop \n" \
+ " .set mips0 \n" \
+ " .section .fixup,\"ax\" \n" \
+ "4: li %0, %6 \n" \
+ " j 3b \n" \
+ " .previous \n" \
+ " .section __ex_table,\"a\" \n" \
+ " "__UA_ADDR "\t(1b + 4), 4b \n" \
+ " "__UA_ADDR "\t(2b + 0), 4b \n" \
+ " .previous \n" \
+ : "=r" (ret), "=&r" (oldval), \
+ "=" GCC_OFF_SMALL_ASM() (*uaddr) \
+ : "0" (0), GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oparg), \
+ "i" (-EFAULT) \
+ : "memory"); \
} else if (cpu_has_llsc) { \
__asm__ __volatile__( \
" .set push \n" \
@@ -178,6 +209,37 @@ futex_atomic_cmpxchg_inatomic(u32 *uval, u32 __user *uaddr,
: GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oldval), "Jr" (newval),
"i" (-EFAULT)
: "memory");
+ } else if (cpu_has_llsc && LOONGSON_LLSC_WAR) {
+ __asm__ __volatile__(
+ "# futex_atomic_cmpxchg_inatomic \n"
+ " .set push \n"
+ " .set noat \n"
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ "1: \n"
+ __WEAK_LLSC_MB
+ " "user_ll("%1", "%3")" \n"
+ " bne %1, %z4, 3f \n"
+ " .set mips0 \n"
+ " move $1, %z5 \n"
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ "2: "user_sc("$1", "%2")" \n"
+ " beqz $1, 1b \n"
+ __WEAK_LLSC_MB
+ "3: \n"
+ " .insn \n"
+ " .set pop \n"
+ " .section .fixup,\"ax\" \n"
+ "4: li %0, %6 \n"
+ " j 3b \n"
+ " .previous \n"
+ " .section __ex_table,\"a\" \n"
+ " "__UA_ADDR "\t(1b + 4), 4b \n"
+ " "__UA_ADDR "\t(2b + 0), 4b \n"
+ " .previous \n"
+ : "+r" (ret), "=&r" (val), "=" GCC_OFF_SMALL_ASM() (*uaddr)
+ : GCC_OFF_SMALL_ASM() (*uaddr), "Jr" (oldval), "Jr" (newval),
+ "i" (-EFAULT)
+ : "memory");
} else if (cpu_has_llsc) {
__asm__ __volatile__(
"# futex_atomic_cmpxchg_inatomic \n"
diff --git a/arch/mips/include/asm/local.h b/arch/mips/include/asm/local.h
index 8feaed6..a6e9d06 100644
--- a/arch/mips/include/asm/local.h
+++ b/arch/mips/include/asm/local.h
@@ -44,6 +44,23 @@ static __inline__ long local_add_return(long i, local_t * l)
: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
: "Ir" (i), "m" (l->a.counter)
: "memory");
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ unsigned long temp;
+
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ "1: \n"
+ __WEAK_LLSC_MB
+ __LL "%1, %2 # local_add_return \n"
+ " addu %0, %1, %3 \n"
+ __SC "%0, %2 \n"
+ " beqz %0, 1b \n"
+ " addu %0, %1, %3 \n"
+ " .set mips0 \n"
+ : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
+ : "Ir" (i), "m" (l->a.counter)
+ : "memory");
+ smp_llsc_mb();
} else if (kernel_uses_llsc) {
unsigned long temp;
@@ -89,6 +106,23 @@ static __inline__ long local_sub_return(long i, local_t * l)
: "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
: "Ir" (i), "m" (l->a.counter)
: "memory");
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ unsigned long temp;
+
+ __asm__ __volatile__(
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ "1: \n"
+ __WEAK_LLSC_MB
+ __LL "%1, %2 # local_sub_return \n"
+ " subu %0, %1, %3 \n"
+ __SC "%0, %2 \n"
+ " beqz %0, 1b \n"
+ " subu %0, %1, %3 \n"
+ " .set mips0 \n"
+ : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
+ : "Ir" (i), "m" (l->a.counter)
+ : "memory");
+ smp_llsc_mb();
} else if (kernel_uses_llsc) {
unsigned long temp;
diff --git a/arch/mips/include/asm/mach-cavium-octeon/war.h b/arch/mips/include/asm/mach-cavium-octeon/war.h
index 35c80be..1c43fb2 100644
--- a/arch/mips/include/asm/mach-cavium-octeon/war.h
+++ b/arch/mips/include/asm/mach-cavium-octeon/war.h
@@ -20,6 +20,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#define CAVIUM_OCTEON_DCACHE_PREFETCH_WAR \
diff --git a/arch/mips/include/asm/mach-generic/war.h b/arch/mips/include/asm/mach-generic/war.h
index a1bc2e7..2dd9bf5 100644
--- a/arch/mips/include/asm/mach-generic/war.h
+++ b/arch/mips/include/asm/mach-generic/war.h
@@ -19,6 +19,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#endif /* __ASM_MACH_GENERIC_WAR_H */
diff --git a/arch/mips/include/asm/mach-ip22/war.h b/arch/mips/include/asm/mach-ip22/war.h
index fba6405..66ddafa 100644
--- a/arch/mips/include/asm/mach-ip22/war.h
+++ b/arch/mips/include/asm/mach-ip22/war.h
@@ -23,6 +23,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#endif /* __ASM_MIPS_MACH_IP22_WAR_H */
diff --git a/arch/mips/include/asm/mach-ip27/war.h b/arch/mips/include/asm/mach-ip27/war.h
index 4ee0e4b..63ee1e5 100644
--- a/arch/mips/include/asm/mach-ip27/war.h
+++ b/arch/mips/include/asm/mach-ip27/war.h
@@ -19,6 +19,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 1
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#endif /* __ASM_MIPS_MACH_IP27_WAR_H */
diff --git a/arch/mips/include/asm/mach-ip28/war.h b/arch/mips/include/asm/mach-ip28/war.h
index 4821c7b..e455320 100644
--- a/arch/mips/include/asm/mach-ip28/war.h
+++ b/arch/mips/include/asm/mach-ip28/war.h
@@ -19,6 +19,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 1
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#endif /* __ASM_MIPS_MACH_IP28_WAR_H */
diff --git a/arch/mips/include/asm/mach-ip32/war.h b/arch/mips/include/asm/mach-ip32/war.h
index 9807ecd..2bd4caf 100644
--- a/arch/mips/include/asm/mach-ip32/war.h
+++ b/arch/mips/include/asm/mach-ip32/war.h
@@ -19,6 +19,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 1
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#endif /* __ASM_MIPS_MACH_IP32_WAR_H */
diff --git a/arch/mips/include/asm/mach-loongson64/war.h b/arch/mips/include/asm/mach-loongson64/war.h
new file mode 100644
index 0000000..c5f9aaa
--- /dev/null
+++ b/arch/mips/include/asm/mach-loongson64/war.h
@@ -0,0 +1,26 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2002, 2004, 2007 by Ralf Baechle <ralf@xxxxxxxxxxxxxx>
+ * Copyright (C) 2015, 2016 by Huacai Chen <chenhc@xxxxxxxxxx>
+ */
+#ifndef __ASM_MIPS_MACH_LOONGSON64_WAR_H
+#define __ASM_MIPS_MACH_LOONGSON64_WAR_H
+
+#define R4600_V1_INDEX_ICACHEOP_WAR 0
+#define R4600_V1_HIT_CACHEOP_WAR 0
+#define R4600_V2_HIT_CACHEOP_WAR 0
+#define R5432_CP0_INTERRUPT_WAR 0
+#define BCM1250_M3_WAR 0
+#define SIBYTE_1956_WAR 0
+#define MIPS4K_ICACHE_REFILL_WAR 0
+#define MIPS_CACHE_SYNC_WAR 0
+#define TX49XX_ICACHE_INDEX_INV_WAR 0
+#define ICACHE_REFILLS_WORKAROUND_WAR 0
+#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR IS_ENABLED(CONFIG_CPU_LOONGSON3)
+#define MIPS34K_MISSED_ITLB_WAR 0
+
+#endif /* __ASM_MIPS_MACH_LOONGSON64_WAR_H */
diff --git a/arch/mips/include/asm/mach-malta/war.h b/arch/mips/include/asm/mach-malta/war.h
index d068fc4..c380825 100644
--- a/arch/mips/include/asm/mach-malta/war.h
+++ b/arch/mips/include/asm/mach-malta/war.h
@@ -19,6 +19,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 1
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#endif /* __ASM_MIPS_MACH_MIPS_WAR_H */
diff --git a/arch/mips/include/asm/mach-pmcs-msp71xx/war.h b/arch/mips/include/asm/mach-pmcs-msp71xx/war.h
index a60bf9d..8c5f396 100644
--- a/arch/mips/include/asm/mach-pmcs-msp71xx/war.h
+++ b/arch/mips/include/asm/mach-pmcs-msp71xx/war.h
@@ -19,6 +19,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#if defined(CONFIG_PMC_MSP7120_EVAL) || defined(CONFIG_PMC_MSP7120_GW) || \
defined(CONFIG_PMC_MSP7120_FPGA)
#define MIPS34K_MISSED_ITLB_WAR 1
diff --git a/arch/mips/include/asm/mach-rc32434/war.h b/arch/mips/include/asm/mach-rc32434/war.h
index 1bfd489a..72d2926 100644
--- a/arch/mips/include/asm/mach-rc32434/war.h
+++ b/arch/mips/include/asm/mach-rc32434/war.h
@@ -19,6 +19,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#endif /* __ASM_MIPS_MACH_MIPS_WAR_H */
diff --git a/arch/mips/include/asm/mach-rm/war.h b/arch/mips/include/asm/mach-rm/war.h
index a3dde98..5683389 100644
--- a/arch/mips/include/asm/mach-rm/war.h
+++ b/arch/mips/include/asm/mach-rm/war.h
@@ -23,6 +23,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#endif /* __ASM_MIPS_MACH_RM_WAR_H */
diff --git a/arch/mips/include/asm/mach-sibyte/war.h b/arch/mips/include/asm/mach-sibyte/war.h
index 520f8fc..b9d7bcb 100644
--- a/arch/mips/include/asm/mach-sibyte/war.h
+++ b/arch/mips/include/asm/mach-sibyte/war.h
@@ -34,6 +34,7 @@ extern int sb1250_m3_workaround_needed(void);
#define TX49XX_ICACHE_INDEX_INV_WAR 0
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#endif /* __ASM_MIPS_MACH_SIBYTE_WAR_H */
diff --git a/arch/mips/include/asm/mach-tx49xx/war.h b/arch/mips/include/asm/mach-tx49xx/war.h
index a8e2c58..fd44710 100644
--- a/arch/mips/include/asm/mach-tx49xx/war.h
+++ b/arch/mips/include/asm/mach-tx49xx/war.h
@@ -19,6 +19,7 @@
#define TX49XX_ICACHE_INDEX_INV_WAR 1
#define ICACHE_REFILLS_WORKAROUND_WAR 0
#define R10000_LLSC_WAR 0
+#define LOONGSON_LLSC_WAR 0
#define MIPS34K_MISSED_ITLB_WAR 0
#endif /* __ASM_MIPS_MACH_TX49XX_WAR_H */
diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index 9e9e944..d534185 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -228,6 +228,25 @@ static inline void set_pte(pte_t *ptep, pte_t pteval)
" .set mips0 \n"
: [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
: [global] "r" (page_global));
+ } else if (kernel_uses_llsc && LOONGSON_LLSC_WAR) {
+ __asm__ __volatile__ (
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ " .set push \n"
+ " .set noreorder \n"
+ "1: \n"
+ __WEAK_LLSC_MB
+ __LL "%[tmp], %[buddy] \n"
+ " bnez %[tmp], 2f \n"
+ " or %[tmp], %[tmp], %[global] \n"
+ __SC "%[tmp], %[buddy] \n"
+ " beqz %[tmp], 1b \n"
+ " nop \n"
+ "2: \n"
+ " .set pop \n"
+ " .set mips0 \n"
+ : [buddy] "+m" (buddy->pte), [tmp] "=&r" (tmp)
+ : [global] "r" (page_global));
+ smp_llsc_mb();
} else if (kernel_uses_llsc) {
__asm__ __volatile__ (
" .set "MIPS_ISA_ARCH_LEVEL" \n"
diff --git a/arch/mips/include/asm/spinlock.h b/arch/mips/include/asm/spinlock.h
index a8df44d..1e44b76 100644
--- a/arch/mips/include/asm/spinlock.h
+++ b/arch/mips/include/asm/spinlock.h
@@ -114,6 +114,41 @@ static inline void arch_spin_lock(arch_spinlock_t *lock)
[ticket] "=&r" (tmp),
[my_ticket] "=&r" (my_ticket)
: [inc] "r" (inc));
+ } else if (LOONGSON_LLSC_WAR) {
+ __asm__ __volatile__ (
+ " .set push # arch_spin_lock \n"
+ " .set noreorder \n"
+ " \n"
+ "1: \n"
+ __WEAK_LLSC_MB
+ " ll %[ticket], %[ticket_ptr] \n"
+ " addu %[my_ticket], %[ticket], %[inc] \n"
+ " sc %[my_ticket], %[ticket_ptr] \n"
+ " beqz %[my_ticket], 1b \n"
+ " srl %[my_ticket], %[ticket], 16 \n"
+ " andi %[ticket], %[ticket], 0xffff \n"
+ " bne %[ticket], %[my_ticket], 4f \n"
+ " subu %[ticket], %[my_ticket], %[ticket] \n"
+ "2: \n"
+ " .subsection 2 \n"
+ "4: andi %[ticket], %[ticket], 0xffff \n"
+ " sll %[ticket], 5 \n"
+ " \n"
+ "6: bnez %[ticket], 6b \n"
+ " subu %[ticket], 1 \n"
+ " \n"
+ " lhu %[ticket], %[serving_now_ptr] \n"
+ " beq %[ticket], %[my_ticket], 2b \n"
+ " subu %[ticket], %[my_ticket], %[ticket] \n"
+ " b 4b \n"
+ " subu %[ticket], %[ticket], 1 \n"
+ " .previous \n"
+ " .set pop \n"
+ : [ticket_ptr] "+" GCC_OFF_SMALL_ASM() (lock->lock),
+ [serving_now_ptr] "+m" (lock->h.serving_now),
+ [ticket] "=&r" (tmp),
+ [my_ticket] "=&r" (my_ticket)
+ : [inc] "r" (inc));
} else {
__asm__ __volatile__ (
" .set push # arch_spin_lock \n"
@@ -189,6 +224,32 @@ static inline unsigned int arch_spin_trylock(arch_spinlock_t *lock)
[my_ticket] "=&r" (tmp2),
[now_serving] "=&r" (tmp3)
: [inc] "r" (inc));
+ } if (LOONGSON_LLSC_WAR) {
+ __asm__ __volatile__ (
+ " .set push # arch_spin_trylock \n"
+ " .set noreorder \n"
+ " \n"
+ "1: \n"
+ __WEAK_LLSC_MB
+ " ll %[ticket], %[ticket_ptr] \n"
+ " srl %[my_ticket], %[ticket], 16 \n"
+ " andi %[now_serving], %[ticket], 0xffff \n"
+ " bne %[my_ticket], %[now_serving], 3f \n"
+ " addu %[ticket], %[ticket], %[inc] \n"
+ " sc %[ticket], %[ticket_ptr] \n"
+ " beqz %[ticket], 1b \n"
+ " li %[ticket], 1 \n"
+ "2: \n"
+ " .subsection 2 \n"
+ "3: b 2b \n"
+ " li %[ticket], 0 \n"
+ " .previous \n"
+ " .set pop \n"
+ : [ticket_ptr] "+" GCC_OFF_SMALL_ASM() (lock->lock),
+ [ticket] "=&r" (tmp),
+ [my_ticket] "=&r" (tmp2),
+ [now_serving] "=&r" (tmp3)
+ : [inc] "r" (inc));
} else {
__asm__ __volatile__ (
" .set push # arch_spin_trylock \n"
@@ -258,6 +319,19 @@ static inline void arch_read_lock(arch_rwlock_t *rw)
: "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp)
: GCC_OFF_SMALL_ASM() (rw->lock)
: "memory");
+ } else if (LOONGSON_LLSC_WAR) {
+ do {
+ __asm__ __volatile__(
+ "1: # arch_read_lock \n"
+ __WEAK_LLSC_MB
+ " ll %1, %2 \n"
+ " bltz %1, 1b \n"
+ " addu %1, 1 \n"
+ "2: sc %1, %0 \n"
+ : "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp)
+ : GCC_OFF_SMALL_ASM() (rw->lock)
+ : "memory");
+ } while (unlikely(!tmp));
} else {
do {
__asm__ __volatile__(
@@ -289,6 +363,20 @@ static inline void arch_read_unlock(arch_rwlock_t *rw)
: "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp)
: GCC_OFF_SMALL_ASM() (rw->lock)
: "memory");
+ } else if (LOONGSON_LLSC_WAR) {
+ do {
+ __asm__ __volatile__(
+ "1: # arch_read_unlock \n"
+ __WEAK_LLSC_MB
+ " ll %1, %2 \n"
+ " addiu %1, -1 \n"
+ " sc %1, %0 \n"
+ : "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp)
+ : GCC_OFF_SMALL_ASM() (rw->lock)
+ : "memory");
+ } while (unlikely(!tmp));
+
+ smp_llsc_mb();
} else {
do {
__asm__ __volatile__(
@@ -319,6 +407,19 @@ static inline void arch_write_lock(arch_rwlock_t *rw)
: "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp)
: GCC_OFF_SMALL_ASM() (rw->lock)
: "memory");
+ } else if (LOONGSON_LLSC_WAR) {
+ do {
+ __asm__ __volatile__(
+ "1: # arch_write_lock \n"
+ __WEAK_LLSC_MB
+ " ll %1, %2 \n"
+ " bnez %1, 1b \n"
+ " lui %1, 0x8000 \n"
+ "2: sc %1, %0 \n"
+ : "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp)
+ : GCC_OFF_SMALL_ASM() (rw->lock)
+ : "memory");
+ } while (unlikely(!tmp));
} else {
do {
__asm__ __volatile__(
@@ -345,6 +446,8 @@ static inline void arch_write_unlock(arch_rwlock_t *rw)
: "=m" (rw->lock)
: "m" (rw->lock)
: "memory");
+
+ nudge_writes();
}
static inline int arch_read_trylock(arch_rwlock_t *rw)
@@ -369,6 +472,27 @@ static inline int arch_read_trylock(arch_rwlock_t *rw)
: "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp), "=&r" (ret)
: GCC_OFF_SMALL_ASM() (rw->lock)
: "memory");
+ } else if (LOONGSON_LLSC_WAR) {
+ __asm__ __volatile__(
+ " .set noreorder # arch_read_trylock \n"
+ " li %2, 0 \n"
+ "1: \n"
+ __WEAK_LLSC_MB
+ " ll %1, %3 \n"
+ " bltz %1, 2f \n"
+ " addu %1, 1 \n"
+ " sc %1, %0 \n"
+ " beqz %1, 1b \n"
+ " nop \n"
+ " .set reorder \n"
+ __WEAK_LLSC_MB
+ " li %2, 1 \n"
+ "2: \n"
+ : "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp), "=&r" (ret)
+ : GCC_OFF_SMALL_ASM() (rw->lock)
+ : "memory");
+
+ smp_llsc_mb();
} else {
__asm__ __volatile__(
" .set noreorder # arch_read_trylock \n"
@@ -413,6 +537,24 @@ static inline int arch_write_trylock(arch_rwlock_t *rw)
: "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp), "=&r" (ret)
: GCC_OFF_SMALL_ASM() (rw->lock)
: "memory");
+ } else if (LOONGSON_LLSC_WAR) {
+ do {
+ __asm__ __volatile__(
+ __WEAK_LLSC_MB
+ " ll %1, %3 # arch_write_trylock \n"
+ " li %2, 0 \n"
+ " bnez %1, 2f \n"
+ " lui %1, 0x8000 \n"
+ " sc %1, %0 \n"
+ " li %2, 1 \n"
+ "2: \n"
+ : "=" GCC_OFF_SMALL_ASM() (rw->lock), "=&r" (tmp),
+ "=&r" (ret)
+ : GCC_OFF_SMALL_ASM() (rw->lock)
+ : "memory");
+ } while (unlikely(!tmp));
+
+ smp_llsc_mb();
} else {
do {
__asm__ __volatile__(
diff --git a/arch/mips/include/asm/war.h b/arch/mips/include/asm/war.h
index 9344e24..2fe696a 100644
--- a/arch/mips/include/asm/war.h
+++ b/arch/mips/include/asm/war.h
@@ -227,6 +227,14 @@
#endif
/*
+ * On the Loongson-2G/2H/3A/3B there is a bug that ll / sc and lld / scd is
+ * very weak ordering.
+ */
+#ifndef LOONGSON_LLSC_WAR
+#error Check setting of LOONGSON_LLSC_WAR for your platform
+#endif
+
+/*
* 34K core erratum: "Problems Executing the TLBR Instruction"
*/
#ifndef MIPS34K_MISSED_ITLB_WAR
diff --git a/arch/mips/kernel/syscall.c b/arch/mips/kernel/syscall.c
index 58c6f63..8dd8cb8 100644
--- a/arch/mips/kernel/syscall.c
+++ b/arch/mips/kernel/syscall.c
@@ -128,6 +128,40 @@ static inline int mips_atomic_set(unsigned long addr, unsigned long new)
[new] "r" (new),
[efault] "i" (-EFAULT)
: "memory");
+ } else if (cpu_has_llsc && LOONGSON_LLSC_WAR) {
+ __asm__ __volatile__ (
+ " .set "MIPS_ISA_ARCH_LEVEL" \n"
+ " li %[err], 0 \n"
+ "1: \n"
+ __WEAK_LLSC_MB
+ " ll %[old], (%[addr]) \n"
+ " move %[tmp], %[new] \n"
+ "2: sc %[tmp], (%[addr]) \n"
+ " beqz %[tmp], 4f \n"
+ "3: \n"
+ " .insn \n"
+ " .subsection 2 \n"
+ "4: b 1b \n"
+ " .previous \n"
+ " \n"
+ " .section .fixup,\"ax\" \n"
+ "5: li %[err], %[efault] \n"
+ " j 3b \n"
+ " .previous \n"
+ " .section __ex_table,\"a\" \n"
+ " "STR(PTR)" (1b + 4), 5b \n"
+ " "STR(PTR)" (2b + 0), 5b \n"
+ " .previous \n"
+ " .set mips0 \n"
+ : [old] "=&r" (old),
+ [err] "=&r" (err),
+ [tmp] "=&r" (tmp)
+ : [addr] "r" (addr),
+ [new] "r" (new),
+ [efault] "i" (-EFAULT)
+ : "memory");
+
+ smp_llsc_mb();
} else if (cpu_has_llsc) {
__asm__ __volatile__ (
" .set "MIPS_ISA_ARCH_LEVEL" \n"
diff --git a/arch/mips/loongson64/Platform b/arch/mips/loongson64/Platform
index 0fce460..3700dcf 100644
--- a/arch/mips/loongson64/Platform
+++ b/arch/mips/loongson64/Platform
@@ -23,6 +23,9 @@ ifdef CONFIG_CPU_LOONGSON2F_WORKAROUNDS
endif
cflags-$(CONFIG_CPU_LOONGSON3) += -Wa,--trap
+ifneq ($(call as-option,-Wa$(comma)-mfix-loongson3-llsc,),)
+ cflags-$(CONFIG_CPU_LOONGSON3) += -Wa$(comma)-mno-fix-loongson3-llsc
+endif
#
# binutils from v2.25 on and gcc starting from v4.9.0 treat -march=loongson3a
# as MIPS64 R2; older versions as just R1. This leaves the possibility open
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c
index ed1c529..2ed9a88 100644
--- a/arch/mips/mm/tlbex.c
+++ b/arch/mips/mm/tlbex.c
@@ -92,6 +92,11 @@ static inline int __maybe_unused r10000_llsc_war(void)
return R10000_LLSC_WAR;
}
+static inline int __maybe_unused loongson_llsc_war(void)
+{
+ return LOONGSON_LLSC_WAR;
+}
+
static int use_bbit_insns(void)
{
switch (current_cpu_type()) {
@@ -936,6 +941,8 @@ build_get_pgd_vmalloc64(u32 **p, struct uasm_label **l, struct uasm_reloc **r,
* to mimic that here by taking a load/istream page
* fault.
*/
+ if (loongson_llsc_war())
+ uasm_i_sync(p, 0);
UASM_i_LA(p, ptr, (unsigned long)tlb_do_page_fault_0);
uasm_i_jr(p, ptr);
@@ -1561,6 +1568,8 @@ static void build_loongson3_tlb_refill_handler(void)
if (check_for_high_segbits) {
uasm_l_large_segbits_fault(&l, p);
+ if (loongson_llsc_war())
+ uasm_i_sync(&p, 0);
UASM_i_LA(&p, K1, (unsigned long)tlb_do_page_fault_0);
uasm_i_jr(&p, K1);
uasm_i_nop(&p);
@@ -1661,6 +1670,8 @@ static void
iPTE_LW(u32 **p, unsigned int pte, unsigned int ptr)
{
#ifdef CONFIG_SMP
+ if (loongson_llsc_war())
+ uasm_i_sync(p, 0);
# ifdef CONFIG_PHYS_ADDR_T_64BIT
if (cpu_has_64bits)
uasm_i_lld(p, pte, 0, ptr);
@@ -2242,6 +2253,8 @@ static void build_r4000_tlb_load_handler(void)
#endif
uasm_l_nopage_tlbl(&l, p);
+ if (loongson_llsc_war())
+ uasm_i_sync(&p, 0);
build_restore_work_registers(&p);
#ifdef CONFIG_CPU_MICROMIPS
if ((unsigned long)tlb_do_page_fault_0 & 1) {
@@ -2297,6 +2310,8 @@ static void build_r4000_tlb_store_handler(void)
#endif
uasm_l_nopage_tlbs(&l, p);
+ if (loongson_llsc_war())
+ uasm_i_sync(&p, 0);
build_restore_work_registers(&p);
#ifdef CONFIG_CPU_MICROMIPS
if ((unsigned long)tlb_do_page_fault_1 & 1) {
@@ -2353,6 +2368,8 @@ static void build_r4000_tlb_modify_handler(void)
#endif
uasm_l_nopage_tlbm(&l, p);
+ if (loongson_llsc_war())
+ uasm_i_sync(&p, 0);
build_restore_work_registers(&p);
#ifdef CONFIG_CPU_MICROMIPS
if ((unsigned long)tlb_do_page_fault_1 & 1) {
--
2.7.0
