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-rw-r--r--arch/powerpc/Kconfig3
-rw-r--r--arch/powerpc/Makefile4
-rw-r--r--arch/powerpc/include/asm/atomic.h24
-rw-r--r--arch/powerpc/include/asm/io.h37
-rw-r--r--arch/powerpc/include/asm/uaccess.h28
-rw-r--r--arch/powerpc/kernel/trace/ftrace.c2
-rw-r--r--arch/powerpc/platforms/Kconfig.cputype20
7 files changed, 112 insertions, 6 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 3fb2c2766139..109c00bd91db 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -4,6 +4,9 @@ source "arch/powerpc/platforms/Kconfig.cputype"
config CC_HAS_ELFV2
def_bool PPC64 && $(cc-option, -mabi=elfv2)
+config CC_HAS_PREFIXED
+ def_bool PPC64 && $(cc-option, -mcpu=power10 -mprefixed)
+
config 32BIT
bool
default y if PPC32
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 4343cca57cb3..9fb770d3b409 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -180,7 +180,11 @@ ifdef CONFIG_476FPE_ERR46
endif
# No prefix or pcrel
+ifdef CONFIG_PPC_KERNEL_PREFIXED
+KBUILD_CFLAGS += $(call cc-option,-mprefixed)
+else
KBUILD_CFLAGS += $(call cc-option,-mno-prefixed)
+endif
KBUILD_CFLAGS += $(call cc-option,-mno-pcrel)
# No AltiVec or VSX or MMA instructions when building kernel
diff --git a/arch/powerpc/include/asm/atomic.h b/arch/powerpc/include/asm/atomic.h
index b3a53830446b..47228b177478 100644
--- a/arch/powerpc/include/asm/atomic.h
+++ b/arch/powerpc/include/asm/atomic.h
@@ -27,14 +27,22 @@ static __inline__ int arch_atomic_read(const atomic_t *v)
{
int t;
- __asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m<>"(v->counter));
+ /* -mprefixed can generate offsets beyond range, fall back hack */
+ if (IS_ENABLED(CONFIG_PPC_KERNEL_PREFIXED))
+ __asm__ __volatile__("lwz %0,0(%1)" : "=r"(t) : "b"(&v->counter));
+ else
+ __asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m<>"(v->counter));
return t;
}
static __inline__ void arch_atomic_set(atomic_t *v, int i)
{
- __asm__ __volatile__("stw%U0%X0 %1,%0" : "=m<>"(v->counter) : "r"(i));
+ /* -mprefixed can generate offsets beyond range, fall back hack */
+ if (IS_ENABLED(CONFIG_PPC_KERNEL_PREFIXED))
+ __asm__ __volatile__("stw %1,0(%2)" : "=m"(v->counter) : "r"(i), "b"(&v->counter));
+ else
+ __asm__ __volatile__("stw%U0%X0 %1,%0" : "=m<>"(v->counter) : "r"(i));
}
#define ATOMIC_OP(op, asm_op, suffix, sign, ...) \
@@ -197,14 +205,22 @@ static __inline__ s64 arch_atomic64_read(const atomic64_t *v)
{
s64 t;
- __asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m<>"(v->counter));
+ /* -mprefixed can generate offsets beyond range, fall back hack */
+ if (IS_ENABLED(CONFIG_PPC_KERNEL_PREFIXED))
+ __asm__ __volatile__("ld %0,0(%1)" : "=r"(t) : "b"(&v->counter));
+ else
+ __asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m<>"(v->counter));
return t;
}
static __inline__ void arch_atomic64_set(atomic64_t *v, s64 i)
{
- __asm__ __volatile__("std%U0%X0 %1,%0" : "=m<>"(v->counter) : "r"(i));
+ /* -mprefixed can generate offsets beyond range, fall back hack */
+ if (IS_ENABLED(CONFIG_PPC_KERNEL_PREFIXED))
+ __asm__ __volatile__("std %1,0(%2)" : "=m"(v->counter) : "r"(i), "b"(&v->counter));
+ else
+ __asm__ __volatile__("std%U0%X0 %1,%0" : "=m<>"(v->counter) : "r"(i));
}
#define ATOMIC64_OP(op, asm_op) \
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index fc112a91d0c2..f1e657c9bbe8 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -97,6 +97,42 @@ extern bool isa_io_special;
*
*/
+/* -mprefixed can generate offsets beyond range, fall back hack */
+#ifdef CONFIG_PPC_KERNEL_PREFIXED
+#define DEF_MMIO_IN_X(name, size, insn) \
+static inline u##size name(const volatile u##size __iomem *addr) \
+{ \
+ u##size ret; \
+ __asm__ __volatile__("sync;"#insn" %0,0,%1;twi 0,%0,0;isync" \
+ : "=r" (ret) : "r" (addr) : "memory"); \
+ return ret; \
+}
+
+#define DEF_MMIO_OUT_X(name, size, insn) \
+static inline void name(volatile u##size __iomem *addr, u##size val) \
+{ \
+ __asm__ __volatile__("sync;"#insn" %1,0,%0" \
+ : : "r" (addr), "r" (val) : "memory"); \
+ mmiowb_set_pending(); \
+}
+
+#define DEF_MMIO_IN_D(name, size, insn) \
+static inline u##size name(const volatile u##size __iomem *addr) \
+{ \
+ u##size ret; \
+ __asm__ __volatile__("sync;"#insn" %0,0(%1);twi 0,%0,0;isync"\
+ : "=r" (ret) : "b" (addr) : "memory"); \
+ return ret; \
+}
+
+#define DEF_MMIO_OUT_D(name, size, insn) \
+static inline void name(volatile u##size __iomem *addr, u##size val) \
+{ \
+ __asm__ __volatile__("sync;"#insn" %1,0(%0)" \
+ : : "b" (addr), "r" (val) : "memory"); \
+ mmiowb_set_pending(); \
+}
+#else
#define DEF_MMIO_IN_X(name, size, insn) \
static inline u##size name(const volatile u##size __iomem *addr) \
{ \
@@ -130,6 +166,7 @@ static inline void name(volatile u##size __iomem *addr, u##size val) \
: "=m<>" (*addr) : "r" (val) : "memory"); \
mmiowb_set_pending(); \
}
+#endif
DEF_MMIO_IN_D(in_8, 8, lbz);
DEF_MMIO_OUT_D(out_8, 8, stb);
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 52378e641d38..a2d255aa9627 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -71,14 +71,26 @@ __pu_failed: \
* because we do not write to any memory gcc knows about, so there
* are no aliasing issues.
*/
+/* -mprefixed can generate offsets beyond range, fall back hack */
+#ifdef CONFIG_PPC_KERNEL_PREFIXED
+#define __put_user_asm_goto(x, addr, label, op) \
+ asm_volatile_goto( \
+ "1: " op " %0,0(%1) # put_user\n" \
+ EX_TABLE(1b, %l2) \
+ : \
+ : "r" (x), "b" (addr) \
+ : \
+ : label)
+#else
#define __put_user_asm_goto(x, addr, label, op) \
asm_volatile_goto( \
"1: " op "%U1%X1 %0,%1 # put_user\n" \
EX_TABLE(1b, %l2) \
: \
- : "r" (x), "m<>" (*addr) \
+ : "r" (x), "m<>" (*addr) \
: \
: label)
+#endif
#ifdef __powerpc64__
#define __put_user_asm2_goto(x, ptr, label) \
@@ -131,14 +143,26 @@ do { \
#ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
+/* -mprefixed can generate offsets beyond range, fall back hack */
+#ifdef CONFIG_PPC_KERNEL_PREFIXED
+#define __get_user_asm_goto(x, addr, label, op) \
+ asm_volatile_goto( \
+ "1: "op" %0,0(%1) # get_user\n" \
+ EX_TABLE(1b, %l2) \
+ : "=r" (x) \
+ : "b" (addr) \
+ : \
+ : label)
+#else
#define __get_user_asm_goto(x, addr, label, op) \
asm_volatile_goto( \
"1: "op"%U1%X1 %0, %1 # get_user\n" \
EX_TABLE(1b, %l2) \
: "=r" (x) \
- : "m<>" (*addr) \
+ : "m<>" (*addr) \
: \
: label)
+#endif
#ifdef __powerpc64__
#define __get_user_asm2_goto(x, addr, label) \
diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c
index 7b85c3b460a3..72864fb7a6cc 100644
--- a/arch/powerpc/kernel/trace/ftrace.c
+++ b/arch/powerpc/kernel/trace/ftrace.c
@@ -194,6 +194,8 @@ __ftrace_make_nop(struct module *mod,
* get corrupted.
*
* Use a b +8 to jump over the load.
+ * XXX: could make PCREL depend on MPROFILE_KERNEL
+ * XXX: check PCREL && MPROFILE_KERNEL calling sequence
*/
if (IS_ENABLED(CONFIG_MPROFILE_KERNEL) || IS_ENABLED(CONFIG_PPC32))
pop = ppc_inst(PPC_RAW_NOP());
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 046b571496b1..1ff0d2818da6 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -180,6 +180,7 @@ config POWER10_CPU
bool "POWER10"
depends on PPC_BOOK3S_64
select ARCH_HAS_FAST_MULTIPLIER
+ select PPC_HAVE_PREFIXED_SUPPORT
config E5500_CPU
bool "Freescale e5500"
@@ -454,6 +455,22 @@ config PPC_RADIX_MMU_DEFAULT
If you're unsure, say Y.
+config PPC_KERNEL_PREFIXED
+ depends on PPC_HAVE_PREFIXED_SUPPORT
+ depends on CC_HAS_PREFIXED
+ default n
+ bool "Build Kernel with Prefixed Instructions"
+ help
+ POWER10 and later CPUs support prefixed instructions, 8 byte
+ instructions that include large immediate, pc relative addressing,
+ and various floating point, vector, MMA.
+
+ This option builds the kernel with prefixed instructions, and
+ allows a pc relative addressing option to be selected.
+
+ Kernel support for prefixed instructions in applications and guests
+ is not affected by this option.
+
config PPC_KUEP
bool "Kernel Userspace Execution Prevention" if !40x
default y if !40x
@@ -490,6 +507,9 @@ config PPC_MMU_NOHASH
config PPC_HAVE_PMU_SUPPORT
bool
+config PPC_HAVE_PREFIXED_SUPPORT
+ bool
+
config PMU_SYSFS
bool "Create PMU SPRs sysfs file"
default n
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-11 23:48:22 +0100