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authorPeter Zijlstra <peterz@infradead.org>2015-07-24 15:09:55 +0200
committerIngo Molnar <mingo@kernel.org>2015-08-03 11:34:15 +0200
commit11276d5306b8e5b438a36bbff855fe792d7eaa61 (patch)
tree9ddfc5e1bec6174e838cce8eb67af9e911c4e5f8
parent706249c222f68471b6f8e9e8e9b77665c404b226 (diff)
locking/static_keys: Add a new static_key interface
There are various problems and short-comings with the current static_key interface: - static_key_{true,false}() read like a branch depending on the key value, instead of the actual likely/unlikely branch depending on init value. - static_key_{true,false}() are, as stated above, tied to the static_key init values STATIC_KEY_INIT_{TRUE,FALSE}. - we're limited to the 2 (out of 4) possible options that compile to a default NOP because that's what our arch_static_branch() assembly emits. So provide a new static_key interface: DEFINE_STATIC_KEY_TRUE(name); DEFINE_STATIC_KEY_FALSE(name); Which define a key of different types with an initial true/false value. Then allow: static_branch_likely() static_branch_unlikely() to take a key of either type and emit the right instruction for the case. This means adding a second arch_static_branch_jump() assembly helper which emits a JMP per default. In order to determine the right instruction for the right state, encode the branch type in the LSB of jump_entry::key. This is the final step in removing the naming confusion that has led to a stream of avoidable bugs such as: a833581e372a ("x86, perf: Fix static_key bug in load_mm_cr4()") ... but it also allows new static key combinations that will give us performance enhancements in the subsequent patches. Tested-by: Rabin Vincent <rabin@rab.in> # arm Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> # ppc Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> # s390 Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r--arch/arm/include/asm/jump_label.h25
-rw-r--r--arch/arm64/include/asm/jump_label.h18
-rw-r--r--arch/mips/include/asm/jump_label.h19
-rw-r--r--arch/powerpc/include/asm/jump_label.h19
-rw-r--r--arch/s390/include/asm/jump_label.h19
-rw-r--r--arch/sparc/include/asm/jump_label.h35
-rw-r--r--arch/x86/include/asm/jump_label.h21
-rw-r--r--include/linux/jump_label.h149
-rw-r--r--kernel/jump_label.c37
9 files changed, 298 insertions, 44 deletions
diff --git a/arch/arm/include/asm/jump_label.h b/arch/arm/include/asm/jump_label.h
index 5f337dc5c108..34f7b6980d21 100644
--- a/arch/arm/include/asm/jump_label.h
+++ b/arch/arm/include/asm/jump_label.h
@@ -4,23 +4,32 @@
#ifndef __ASSEMBLY__
#include <linux/types.h>
+#include <asm/unified.h>
#define JUMP_LABEL_NOP_SIZE 4
-#ifdef CONFIG_THUMB2_KERNEL
-#define JUMP_LABEL_NOP "nop.w"
-#else
-#define JUMP_LABEL_NOP "nop"
-#endif
+static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
+{
+ asm_volatile_goto("1:\n\t"
+ WASM(nop) "\n\t"
+ ".pushsection __jump_table, \"aw\"\n\t"
+ ".word 1b, %l[l_yes], %c0\n\t"
+ ".popsection\n\t"
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
+ return false;
+l_yes:
+ return true;
+}
-static __always_inline bool arch_static_branch(struct static_key *key)
+static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
{
asm_volatile_goto("1:\n\t"
- JUMP_LABEL_NOP "\n\t"
+ WASM(b) " %l[l_yes]\n\t"
".pushsection __jump_table, \"aw\"\n\t"
".word 1b, %l[l_yes], %c0\n\t"
".popsection\n\t"
- : : "i" (key) : : l_yes);
+ : : "i" (&((char *)key)[branch]) : : l_yes);
return false;
l_yes:
diff --git a/arch/arm64/include/asm/jump_label.h b/arch/arm64/include/asm/jump_label.h
index c0e5165c2f76..1b5e0e843c3a 100644
--- a/arch/arm64/include/asm/jump_label.h
+++ b/arch/arm64/include/asm/jump_label.h
@@ -26,14 +26,28 @@
#define JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE
-static __always_inline bool arch_static_branch(struct static_key *key)
+static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
asm goto("1: nop\n\t"
".pushsection __jump_table, \"aw\"\n\t"
".align 3\n\t"
".quad 1b, %l[l_yes], %c0\n\t"
".popsection\n\t"
- : : "i"(key) : : l_yes);
+ : : "i"(&((char *)key)[branch]) : : l_yes);
+
+ return false;
+l_yes:
+ return true;
+}
+
+static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
+{
+ asm goto("1: b %l[l_yes]\n\t"
+ ".pushsection __jump_table, \"aw\"\n\t"
+ ".align 3\n\t"
+ ".quad 1b, %l[l_yes], %c0\n\t"
+ ".popsection\n\t"
+ : : "i"(&((char *)key)[branch]) : : l_yes);
return false;
l_yes:
diff --git a/arch/mips/include/asm/jump_label.h b/arch/mips/include/asm/jump_label.h
index 608aa57799c8..e77672539e8e 100644
--- a/arch/mips/include/asm/jump_label.h
+++ b/arch/mips/include/asm/jump_label.h
@@ -26,14 +26,29 @@
#define NOP_INSN "nop"
#endif
-static __always_inline bool arch_static_branch(struct static_key *key)
+static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
asm_volatile_goto("1:\t" NOP_INSN "\n\t"
"nop\n\t"
".pushsection __jump_table, \"aw\"\n\t"
WORD_INSN " 1b, %l[l_yes], %0\n\t"
".popsection\n\t"
- : : "i" (key) : : l_yes);
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
+ return false;
+l_yes:
+ return true;
+}
+
+static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
+{
+ asm_volatile_goto("1:\tj %l[l_yes]\n\t"
+ "nop\n\t"
+ ".pushsection __jump_table, \"aw\"\n\t"
+ WORD_INSN " 1b, %l[l_yes], %0\n\t"
+ ".popsection\n\t"
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
return false;
l_yes:
return true;
diff --git a/arch/powerpc/include/asm/jump_label.h b/arch/powerpc/include/asm/jump_label.h
index efbf9a322a23..47e155f15433 100644
--- a/arch/powerpc/include/asm/jump_label.h
+++ b/arch/powerpc/include/asm/jump_label.h
@@ -18,14 +18,29 @@
#define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG)
#define JUMP_LABEL_NOP_SIZE 4
-static __always_inline bool arch_static_branch(struct static_key *key)
+static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
asm_volatile_goto("1:\n\t"
"nop\n\t"
".pushsection __jump_table, \"aw\"\n\t"
JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
".popsection \n\t"
- : : "i" (key) : : l_yes);
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
+ return false;
+l_yes:
+ return true;
+}
+
+static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
+{
+ asm_volatile_goto("1:\n\t"
+ "b %l[l_yes]\n\t"
+ ".pushsection __jump_table, \"aw\"\n\t"
+ JUMP_ENTRY_TYPE "1b, %l[l_yes], %c0\n\t"
+ ".popsection \n\t"
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
return false;
l_yes:
return true;
diff --git a/arch/s390/include/asm/jump_label.h b/arch/s390/include/asm/jump_label.h
index 69972b7957ee..7f9fd5e3f1bf 100644
--- a/arch/s390/include/asm/jump_label.h
+++ b/arch/s390/include/asm/jump_label.h
@@ -12,14 +12,29 @@
* We use a brcl 0,2 instruction for jump labels at compile time so it
* can be easily distinguished from a hotpatch generated instruction.
*/
-static __always_inline bool arch_static_branch(struct static_key *key)
+static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
asm_volatile_goto("0: brcl 0,"__stringify(JUMP_LABEL_NOP_OFFSET)"\n"
".pushsection __jump_table, \"aw\"\n"
".balign 8\n"
".quad 0b, %l[label], %0\n"
".popsection\n"
- : : "X" (key) : : label);
+ : : "X" (&((char *)key)[branch]) : : label);
+
+ return false;
+label:
+ return true;
+}
+
+static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
+{
+ asm_volatile_goto("0: brcl 15, %l[label]\n"
+ ".pushsection __jump_table, \"aw\"\n"
+ ".balign 8\n"
+ ".quad 0b, %l[label], %0\n"
+ ".popsection\n"
+ : : "X" (&((char *)key)[branch]) : : label);
+
return false;
label:
return true;
diff --git a/arch/sparc/include/asm/jump_label.h b/arch/sparc/include/asm/jump_label.h
index cc9b04a2b11b..62d0354d1727 100644
--- a/arch/sparc/include/asm/jump_label.h
+++ b/arch/sparc/include/asm/jump_label.h
@@ -7,16 +7,33 @@
#define JUMP_LABEL_NOP_SIZE 4
-static __always_inline bool arch_static_branch(struct static_key *key)
+static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
- asm_volatile_goto("1:\n\t"
- "nop\n\t"
- "nop\n\t"
- ".pushsection __jump_table, \"aw\"\n\t"
- ".align 4\n\t"
- ".word 1b, %l[l_yes], %c0\n\t"
- ".popsection \n\t"
- : : "i" (key) : : l_yes);
+ asm_volatile_goto("1:\n\t"
+ "nop\n\t"
+ "nop\n\t"
+ ".pushsection __jump_table, \"aw\"\n\t"
+ ".align 4\n\t"
+ ".word 1b, %l[l_yes], %c0\n\t"
+ ".popsection \n\t"
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
+ return false;
+l_yes:
+ return true;
+}
+
+static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
+{
+ asm_volatile_goto("1:\n\t"
+ "b %l[l_yes]\n\t"
+ "nop\n\t"
+ ".pushsection __jump_table, \"aw\"\n\t"
+ ".align 4\n\t"
+ ".word 1b, %l[l_yes], %c0\n\t"
+ ".popsection \n\t"
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
return false;
l_yes:
return true;
diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h
index a4c1cf7e93f8..28d7a857f9d1 100644
--- a/arch/x86/include/asm/jump_label.h
+++ b/arch/x86/include/asm/jump_label.h
@@ -16,7 +16,7 @@
# define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC
#endif
-static __always_inline bool arch_static_branch(struct static_key *key)
+static __always_inline bool arch_static_branch(struct static_key *key, bool branch)
{
asm_volatile_goto("1:"
".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t"
@@ -24,7 +24,24 @@ static __always_inline bool arch_static_branch(struct static_key *key)
_ASM_ALIGN "\n\t"
_ASM_PTR "1b, %l[l_yes], %c0 \n\t"
".popsection \n\t"
- : : "i" (key) : : l_yes);
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
+ return false;
+l_yes:
+ return true;
+}
+
+static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch)
+{
+ asm_volatile_goto("1:"
+ ".byte 0xe9\n\t .long %l[l_yes] - 2f\n\t"
+ "2:\n\t"
+ ".pushsection __jump_table, \"aw\" \n\t"
+ _ASM_ALIGN "\n\t"
+ _ASM_PTR "1b, %l[l_yes], %c0 \n\t"
+ ".popsection \n\t"
+ : : "i" (&((char *)key)[branch]) : : l_yes);
+
return false;
l_yes:
return true;
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index 65f0ebac63cf..e337a1961933 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -107,12 +107,12 @@ static inline int static_key_count(struct static_key *key)
static __always_inline bool static_key_false(struct static_key *key)
{
- return arch_static_branch(key);
+ return arch_static_branch(key, false);
}
static __always_inline bool static_key_true(struct static_key *key)
{
- return !static_key_false(key);
+ return !arch_static_branch(key, true);
}
extern struct jump_entry __start___jump_table[];
@@ -130,12 +130,12 @@ extern void static_key_slow_inc(struct static_key *key);
extern void static_key_slow_dec(struct static_key *key);
extern void jump_label_apply_nops(struct module *mod);
-#define STATIC_KEY_INIT_TRUE ((struct static_key) \
+#define STATIC_KEY_INIT_TRUE \
{ .enabled = ATOMIC_INIT(1), \
- .entries = (void *)JUMP_TYPE_TRUE })
-#define STATIC_KEY_INIT_FALSE ((struct static_key) \
+ .entries = (void *)JUMP_TYPE_TRUE }
+#define STATIC_KEY_INIT_FALSE \
{ .enabled = ATOMIC_INIT(0), \
- .entries = (void *)JUMP_TYPE_FALSE })
+ .entries = (void *)JUMP_TYPE_FALSE }
#else /* !HAVE_JUMP_LABEL */
@@ -183,10 +183,8 @@ static inline int jump_label_apply_nops(struct module *mod)
return 0;
}
-#define STATIC_KEY_INIT_TRUE ((struct static_key) \
- { .enabled = ATOMIC_INIT(1) })
-#define STATIC_KEY_INIT_FALSE ((struct static_key) \
- { .enabled = ATOMIC_INIT(0) })
+#define STATIC_KEY_INIT_TRUE { .enabled = ATOMIC_INIT(1) }
+#define STATIC_KEY_INIT_FALSE { .enabled = ATOMIC_INIT(0) }
#endif /* HAVE_JUMP_LABEL */
@@ -218,6 +216,137 @@ static inline void static_key_disable(struct static_key *key)
static_key_slow_dec(key);
}
+/* -------------------------------------------------------------------------- */
+
+/*
+ * Two type wrappers around static_key, such that we can use compile time
+ * type differentiation to emit the right code.
+ *
+ * All the below code is macros in order to play type games.
+ */
+
+struct static_key_true {
+ struct static_key key;
+};
+
+struct static_key_false {
+ struct static_key key;
+};
+
+#define STATIC_KEY_TRUE_INIT (struct static_key_true) { .key = STATIC_KEY_INIT_TRUE, }
+#define STATIC_KEY_FALSE_INIT (struct static_key_false){ .key = STATIC_KEY_INIT_FALSE, }
+
+#define DEFINE_STATIC_KEY_TRUE(name) \
+ struct static_key_true name = STATIC_KEY_TRUE_INIT
+
+#define DEFINE_STATIC_KEY_FALSE(name) \
+ struct static_key_false name = STATIC_KEY_FALSE_INIT
+
+#ifdef HAVE_JUMP_LABEL
+
+/*
+ * Combine the right initial value (type) with the right branch order
+ * to generate the desired result.
+ *
+ *
+ * type\branch| likely (1) | unlikely (0)
+ * -----------+-----------------------+------------------
+ * | |
+ * true (1) | ... | ...
+ * | NOP | JMP L
+ * | <br-stmts> | 1: ...
+ * | L: ... |
+ * | |
+ * | | L: <br-stmts>
+ * | | jmp 1b
+ * | |
+ * -----------+-----------------------+------------------
+ * | |
+ * false (0) | ... | ...
+ * | JMP L | NOP
+ * | <br-stmts> | 1: ...
+ * | L: ... |
+ * | |
+ * | | L: <br-stmts>
+ * | | jmp 1b
+ * | |
+ * -----------+-----------------------+------------------
+ *
+ * The initial value is encoded in the LSB of static_key::entries,
+ * type: 0 = false, 1 = true.
+ *
+ * The branch type is encoded in the LSB of jump_entry::key,
+ * branch: 0 = unlikely, 1 = likely.
+ *
+ * This gives the following logic table:
+ *
+ * enabled type branch instuction
+ * -----------------------------+-----------
+ * 0 0 0 | NOP
+ * 0 0 1 | JMP
+ * 0 1 0 | NOP
+ * 0 1 1 | JMP
+ *
+ * 1 0 0 | JMP
+ * 1 0 1 | NOP
+ * 1 1 0 | JMP
+ * 1 1 1 | NOP
+ *
+ * Which gives the following functions:
+ *
+ * dynamic: instruction = enabled ^ branch
+ * static: instruction = type ^ branch
+ *
+ * See jump_label_type() / jump_label_init_type().
+ */
+
+extern bool ____wrong_branch_error(void);
+
+#define static_branch_likely(x) \
+({ \
+ bool branch; \
+ if (__builtin_types_compatible_p(typeof(*x), struct static_key_true)) \
+ branch = !arch_static_branch(&(x)->key, true); \
+ else if (__builtin_types_compatible_p(typeof(*x), struct static_key_false)) \
+ branch = !arch_static_branch_jump(&(x)->key, true); \
+ else \
+ branch = ____wrong_branch_error(); \
+ branch; \
+})
+
+#define static_branch_unlikely(x) \
+({ \
+ bool branch; \
+ if (__builtin_types_compatible_p(typeof(*x), struct static_key_true)) \
+ branch = arch_static_branch_jump(&(x)->key, false); \
+ else if (__builtin_types_compatible_p(typeof(*x), struct static_key_false)) \
+ branch = arch_static_branch(&(x)->key, false); \
+ else \
+ branch = ____wrong_branch_error(); \
+ branch; \
+})
+
+#else /* !HAVE_JUMP_LABEL */
+
+#define static_branch_likely(x) likely(static_key_enabled(&(x)->key))
+#define static_branch_unlikely(x) unlikely(static_key_enabled(&(x)->key))
+
+#endif /* HAVE_JUMP_LABEL */
+
+/*
+ * Advanced usage; refcount, branch is enabled when: count != 0
+ */
+
+#define static_branch_inc(x) static_key_slow_inc(&(x)->key)
+#define static_branch_dec(x) static_key_slow_dec(&(x)->key)
+
+/*
+ * Normal usage; boolean enable/disable.
+ */
+
+#define static_branch_enable(x) static_key_enable(&(x)->key)
+#define static_branch_disable(x) static_key_disable(&(x)->key)
+
#endif /* _LINUX_JUMP_LABEL_H */
#endif /* __ASSEMBLY__ */
diff --git a/kernel/jump_label.c b/kernel/jump_label.c
index 2e7cc1e4b4b5..8fd00d892286 100644
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -165,16 +165,22 @@ static inline bool static_key_type(struct static_key *key)
static inline struct static_key *jump_entry_key(struct jump_entry *entry)
{
- return (struct static_key *)((unsigned long)entry->key);
+ return (struct static_key *)((unsigned long)entry->key & ~1UL);
+}
+
+static bool jump_entry_branch(struct jump_entry *entry)
+{
+ return (unsigned long)entry->key & 1UL;
}
static enum jump_label_type jump_label_type(struct jump_entry *entry)
{
struct static_key *key = jump_entry_key(entry);
bool enabled = static_key_enabled(key);
- bool type = static_key_type(key);
+ bool branch = jump_entry_branch(entry);
- return enabled ^ type;
+ /* See the comment in linux/jump_label.h */
+ return enabled ^ branch;
}
static void __jump_label_update(struct static_key *key,
@@ -205,7 +211,10 @@ void __init jump_label_init(void)
for (iter = iter_start; iter < iter_stop; iter++) {
struct static_key *iterk;
- arch_jump_label_transform_static(iter, jump_label_type(iter));
+ /* rewrite NOPs */
+ if (jump_label_type(iter) == JUMP_LABEL_NOP)
+ arch_jump_label_transform_static(iter, JUMP_LABEL_NOP);
+
iterk = jump_entry_key(iter);
if (iterk == key)
continue;
@@ -225,6 +234,16 @@ void __init jump_label_init(void)
#ifdef CONFIG_MODULES
+static enum jump_label_type jump_label_init_type(struct jump_entry *entry)
+{
+ struct static_key *key = jump_entry_key(entry);
+ bool type = static_key_type(key);
+ bool branch = jump_entry_branch(entry);
+
+ /* See the comment in linux/jump_label.h */
+ return type ^ branch;
+}
+
struct static_key_mod {
struct static_key_mod *next;
struct jump_entry *entries;
@@ -276,8 +295,11 @@ void jump_label_apply_nops(struct module *mod)
if (iter_start == iter_stop)
return;
- for (iter = iter_start; iter < iter_stop; iter++)
- arch_jump_label_transform_static(iter, JUMP_LABEL_NOP);
+ for (iter = iter_start; iter < iter_stop; iter++) {
+ /* Only write NOPs for arch_branch_static(). */
+ if (jump_label_init_type(iter) == JUMP_LABEL_NOP)
+ arch_jump_label_transform_static(iter, JUMP_LABEL_NOP);
+ }
}
static int jump_label_add_module(struct module *mod)
@@ -318,7 +340,8 @@ static int jump_label_add_module(struct module *mod)
jlm->next = key->next;
key->next = jlm;
- if (jump_label_type(iter) == JUMP_LABEL_JMP)
+ /* Only update if we've changed from our initial state */
+ if (jump_label_type(iter) != jump_label_init_type(iter))
__jump_label_update(key, iter, iter_stop);
}