[tip: perf/core] perf: Enhance perf_reg_validate() with simd_enabled argument
From: tip-bot2 for Dapeng Mi
Date: Tue Sep 08 2026 - 18:38:34 EST
The following commit has been merged into the perf/core branch of tip:
Commit-ID: a2c64c74c02957ca11975b5355e70210f7b934ad
Gitweb: https://git.kernel.org/tip/a2c64c74c02957ca11975b5355e70210f7b934ad
Author: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
AuthorDate: Mon, 24 Aug 2026 16:27:25 +08:00
Committer: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Wed, 02 Sep 2026 13:10:45 +02:00
perf: Enhance perf_reg_validate() with simd_enabled argument
The upcoming patch will support x86 APX eGPRs sampling by using the
reclaimed XMM register space to represent eGPRs in sample_regs_* fields.
To differentiate between XMM and eGPRs in sample_regs_* fields, an
additional argument, simd_enabled, is introduced to the
perf_reg_validate() helper. If simd_enabled is set to 1, it indicates
that eGPRs are represented in sample_regs_* fields for the x86 platform;
otherwise, XMM registers are represented.
Signed-off-by: Dapeng Mi <dapeng1.mi@xxxxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Link: https://patch.msgid.link/20260824082731.1013973-18-dapeng1.mi@xxxxxxxxxxxxxxx
---
arch/arm/kernel/perf_regs.c | 2 +-
arch/arm64/kernel/perf_regs.c | 2 +-
arch/csky/kernel/perf_regs.c | 2 +-
arch/loongarch/kernel/perf_regs.c | 2 +-
arch/mips/kernel/perf_regs.c | 2 +-
arch/parisc/kernel/perf_regs.c | 2 +-
arch/powerpc/perf/perf_regs.c | 2 +-
arch/riscv/kernel/perf_regs.c | 2 +-
arch/s390/kernel/perf_regs.c | 2 +-
arch/x86/kernel/perf_regs.c | 4 ++--
include/linux/perf_regs.h | 2 +-
kernel/events/core.c | 8 +++++---
12 files changed, 17 insertions(+), 15 deletions(-)
diff --git a/arch/arm/kernel/perf_regs.c b/arch/arm/kernel/perf_regs.c
index d575a4c..838d701 100644
--- a/arch/arm/kernel/perf_regs.c
+++ b/arch/arm/kernel/perf_regs.c
@@ -18,7 +18,7 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
#define REG_RESERVED (~((1ULL << PERF_REG_ARM_MAX) - 1))
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
if (!mask || mask & REG_RESERVED)
return -EINVAL;
diff --git a/arch/arm64/kernel/perf_regs.c b/arch/arm64/kernel/perf_regs.c
index 70e2f13..71a3e02 100644
--- a/arch/arm64/kernel/perf_regs.c
+++ b/arch/arm64/kernel/perf_regs.c
@@ -77,7 +77,7 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
#define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1))
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
u64 reserved_mask = REG_RESERVED;
diff --git a/arch/csky/kernel/perf_regs.c b/arch/csky/kernel/perf_regs.c
index 94601f3..c932a96 100644
--- a/arch/csky/kernel/perf_regs.c
+++ b/arch/csky/kernel/perf_regs.c
@@ -18,7 +18,7 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
#define REG_RESERVED (~((1ULL << PERF_REG_CSKY_MAX) - 1))
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
if (!mask || mask & REG_RESERVED)
return -EINVAL;
diff --git a/arch/loongarch/kernel/perf_regs.c b/arch/loongarch/kernel/perf_regs.c
index 8dd604f..164514f 100644
--- a/arch/loongarch/kernel/perf_regs.c
+++ b/arch/loongarch/kernel/perf_regs.c
@@ -25,7 +25,7 @@ u64 perf_reg_abi(struct task_struct *tsk)
}
#endif /* CONFIG_32BIT */
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
if (!mask)
return -EINVAL;
diff --git a/arch/mips/kernel/perf_regs.c b/arch/mips/kernel/perf_regs.c
index 7736d3c..00a5201 100644
--- a/arch/mips/kernel/perf_regs.c
+++ b/arch/mips/kernel/perf_regs.c
@@ -28,7 +28,7 @@ u64 perf_reg_abi(struct task_struct *tsk)
}
#endif /* CONFIG_32BIT */
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
if (!mask)
return -EINVAL;
diff --git a/arch/parisc/kernel/perf_regs.c b/arch/parisc/kernel/perf_regs.c
index b9fe1f2..4f21aab 100644
--- a/arch/parisc/kernel/perf_regs.c
+++ b/arch/parisc/kernel/perf_regs.c
@@ -34,7 +34,7 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
#define REG_RESERVED (~((1ULL << PERF_REG_PARISC_MAX) - 1))
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
if (!mask || mask & REG_RESERVED)
return -EINVAL;
diff --git a/arch/powerpc/perf/perf_regs.c b/arch/powerpc/perf/perf_regs.c
index 350dccb..a01d8a9 100644
--- a/arch/powerpc/perf/perf_regs.c
+++ b/arch/powerpc/perf/perf_regs.c
@@ -125,7 +125,7 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
return regs_get_register(regs, pt_regs_offset[idx]);
}
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
if (!mask || mask & REG_RESERVED)
return -EINVAL;
diff --git a/arch/riscv/kernel/perf_regs.c b/arch/riscv/kernel/perf_regs.c
index 3bba8de..1ecc876 100644
--- a/arch/riscv/kernel/perf_regs.c
+++ b/arch/riscv/kernel/perf_regs.c
@@ -18,7 +18,7 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
#define REG_RESERVED (~((1ULL << PERF_REG_RISCV_MAX) - 1))
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
if (!mask || mask & REG_RESERVED)
return -EINVAL;
diff --git a/arch/s390/kernel/perf_regs.c b/arch/s390/kernel/perf_regs.c
index 7b305f1..6496fd2 100644
--- a/arch/s390/kernel/perf_regs.c
+++ b/arch/s390/kernel/perf_regs.c
@@ -34,7 +34,7 @@ u64 perf_reg_value(struct pt_regs *regs, int idx)
#define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1))
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
if (!mask || mask & REG_RESERVED)
return -EINVAL;
diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c
index 87297da..494e065 100644
--- a/arch/x86/kernel/perf_regs.c
+++ b/arch/x86/kernel/perf_regs.c
@@ -198,7 +198,7 @@ int perf_simd_reg_validate(u16 vec_qwords, u64 vec_mask,
(1ULL << PERF_REG_X86_R14) | \
(1ULL << PERF_REG_X86_R15))
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
/* The mask could be 0 if only the SIMD registers are interested */
if (mask & (REG_NOSUPPORT | PERF_REG_X86_RESERVED))
@@ -218,7 +218,7 @@ u64 perf_reg_abi(struct task_struct *task)
(1ULL << PERF_REG_X86_FS) | \
(1ULL << PERF_REG_X86_GS))
-int perf_reg_validate(u64 mask)
+int perf_reg_validate(u64 mask, bool simd_enabled)
{
/* The mask could be 0 if only the SIMD registers are interested */
if (mask & (REG_NOSUPPORT | PERF_REG_X86_RESERVED))
diff --git a/include/linux/perf_regs.h b/include/linux/perf_regs.h
index 518f28c..09dbc2f 100644
--- a/include/linux/perf_regs.h
+++ b/include/linux/perf_regs.h
@@ -10,7 +10,7 @@ struct perf_regs {
};
u64 perf_reg_value(struct pt_regs *regs, int idx);
-int perf_reg_validate(u64 mask);
+int perf_reg_validate(u64 mask, bool simd_enabled);
u64 perf_reg_abi(struct task_struct *task);
void perf_get_regs_user(struct perf_regs *regs_user,
struct pt_regs *regs);
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 2f84f50..e053d8c 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7823,7 +7823,7 @@ u64 __weak perf_reg_value(struct pt_regs *regs, int idx)
return 0;
}
-int __weak perf_reg_validate(u64 mask)
+int __weak perf_reg_validate(u64 mask, bool simd_enabled)
{
return mask ? -ENOSYS : 0;
}
@@ -13804,7 +13804,8 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr,
}
if (attr->sample_type & PERF_SAMPLE_REGS_USER) {
- ret = perf_reg_validate(attr->sample_regs_user);
+ ret = perf_reg_validate(attr->sample_regs_user,
+ attr->sample_simd_regs_enabled);
if (ret)
return ret;
if (attr->sample_simd_regs_enabled) {
@@ -13836,7 +13837,8 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr,
attr->sample_max_stack = sysctl_perf_event_max_stack;
if (attr->sample_type & PERF_SAMPLE_REGS_INTR) {
- ret = perf_reg_validate(attr->sample_regs_intr);
+ ret = perf_reg_validate(attr->sample_regs_intr,
+ attr->sample_simd_regs_enabled);
if (ret)
return ret;
if (attr->sample_simd_regs_enabled) {