Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Daniel Borkmann says:

====================
pull-request: bpf 2017-12-06

The following pull-request contains BPF updates for your *net* tree.

The main changes are:

1) Fixing broken uapi for BPF tracing programs for s390 and arm64
   architectures due to pt_regs being in-kernel only, and not part
   of uapi right now. A wrapper is added that exports pt_regs in
   an asm-generic way. For arm64 this maps to existing user_pt_regs
   structure and for s390 a user_pt_regs structure exporting the
   beginning of pt_regs is added and uapi-exported, thus fixing the
   BPF issues seen in perf (and BPF selftests), all from Hendrik.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/alpha/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
+
+generic-y += bpf_perf_event.h

arch/arc/include/uapi/asm/Kbuild

@@ -3,6 +3,7 @@ include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/arm/include/uapi/asm/Kbuild

@@ -7,6 +7,7 @@ generated-y += unistd-oabi.h
 generated-y += unistd-eabi.h
 
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += ioctl.h
 generic-y += ipcbuf.h

arch/arm64/include/asm/perf_event.h

@@ -18,6 +18,7 @@
 #define __ASM_PERF_EVENT_H
 
 #include <asm/stack_pointer.h>
+#include <asm/ptrace.h>
 
 #define	ARMV8_PMU_MAX_COUNTERS	32
 #define	ARMV8_PMU_COUNTER_MASK	(ARMV8_PMU_MAX_COUNTERS - 1)
@@ -79,6 +80,7 @@ struct pt_regs;
 extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
 extern unsigned long perf_misc_flags(struct pt_regs *regs);
 #define perf_misc_flags(regs)	perf_misc_flags(regs)
+#define perf_arch_bpf_user_pt_regs(regs) &regs->user_regs
 #endif
 
 #define perf_arch_fetch_caller_regs(regs, __ip) { \

arch/arm64/include/uapi/asm/bpf_perf_event.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_BPF_PERF_EVENT_H__
+
+#include <asm/ptrace.h>
+
+typedef struct user_pt_regs bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */

arch/blackfin/include/uapi/asm/Kbuild

@@ -3,6 +3,7 @@ include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += ioctl.h
 generic-y += ipcbuf.h

arch/c6x/include/uapi/asm/Kbuild

@@ -3,6 +3,7 @@ include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/cris/include/uapi/asm/Kbuild

@@ -3,6 +3,7 @@ include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/frv/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
+
+generic-y += bpf_perf_event.h

arch/h8300/include/uapi/asm/Kbuild

@@ -2,6 +2,7 @@
 include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/hexagon/include/uapi/asm/Kbuild

@@ -2,6 +2,7 @@
 include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/ia64/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generic-y += bpf_perf_event.h
 generic-y += kvm_para.h

arch/m32r/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generic-y += bpf_perf_event.h
 generic-y += kvm_para.h
 generic-y += siginfo.h

arch/m68k/include/uapi/asm/Kbuild

@@ -3,6 +3,7 @@ include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += ioctl.h
 generic-y += ipcbuf.h

arch/metag/include/uapi/asm/Kbuild

@@ -3,6 +3,7 @@ include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/microblaze/include/uapi/asm/Kbuild

@@ -2,6 +2,7 @@
 include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/mips/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generic-y += bpf_perf_event.h
 generic-y += ipcbuf.h

arch/mn10300/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generic-y	+= bpf_perf_event.h
 generic-y	+= siginfo.h

arch/nios2/include/uapi/asm/Kbuild

@@ -3,6 +3,7 @@ include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/openrisc/include/uapi/asm/Kbuild

@@ -3,6 +3,7 @@ include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/parisc/include/uapi/asm/Kbuild

@@ -2,6 +2,7 @@
 include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
+generic-y += bpf_perf_event.h
 generic-y += kvm_para.h
 generic-y += param.h
 generic-y += poll.h

arch/powerpc/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generic-y += bpf_perf_event.h
 generic-y += param.h
 generic-y += poll.h
 generic-y += resource.h

arch/riscv/include/uapi/asm/Kbuild

@@ -3,6 +3,7 @@ include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += setup.h
 generic-y += unistd.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/s390/include/asm/perf_event.h

@@ -40,6 +40,7 @@ struct pt_regs;
 extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
 extern unsigned long perf_misc_flags(struct pt_regs *regs);
 #define perf_misc_flags(regs) perf_misc_flags(regs)
+#define perf_arch_bpf_user_pt_regs(regs) &regs->user_regs
 
 /* Perf pt_regs extension for sample-data-entry indicators */
 struct perf_sf_sde_regs {

arch/s390/include/asm/ptrace.h

@@ -74,9 +74,14 @@ enum {
  */
 struct pt_regs 
 {
-	unsigned long args[1];
-	psw_t psw;
-	unsigned long gprs[NUM_GPRS];
+	union {
+		user_pt_regs user_regs;
+		struct {
+			unsigned long args[1];
+			psw_t psw;
+			unsigned long gprs[NUM_GPRS];
+		};
+	};
 	unsigned long orig_gpr2;
 	unsigned int int_code;
 	unsigned int int_parm;

arch/s390/include/uapi/asm/bpf_perf_event.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_BPF_PERF_EVENT_H__
+
+#include <asm/ptrace.h>
+
+typedef user_pt_regs bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */

arch/s390/include/uapi/asm/ptrace.h

@@ -162,7 +162,7 @@
 #define GPR_SIZE	8
 #define CR_SIZE		8
 
-#define STACK_FRAME_OVERHEAD    160      /* size of minimum stack frame */
+#define STACK_FRAME_OVERHEAD	160	 /* size of minimum stack frame */
 
 #endif /* __s390x__ */
 
@@ -179,17 +179,16 @@
 #define ACR_SIZE	4
 
 
-#define PTRACE_OLDSETOPTIONS         21
+#define PTRACE_OLDSETOPTIONS	     21
 
 #ifndef __ASSEMBLY__
 #include <linux/stddef.h>
 #include <linux/types.h>
 
-typedef union
-{
-	float   f;
-	double  d;
-        __u64   ui;
+typedef union {
+	float	f;
+	double	d;
+	__u64	ui;
 	struct
 	{
 		__u32 hi;
@@ -197,23 +196,21 @@ typedef union
 	} fp;
 } freg_t;
 
-typedef struct
-{
-	__u32   fpc;
+typedef struct {
+	__u32	fpc;
 	__u32	pad;
-	freg_t  fprs[NUM_FPRS];              
+	freg_t	fprs[NUM_FPRS];
 } s390_fp_regs;
 
-#define FPC_EXCEPTION_MASK      0xF8000000
-#define FPC_FLAGS_MASK          0x00F80000
-#define FPC_DXC_MASK            0x0000FF00
-#define FPC_RM_MASK             0x00000003
+#define FPC_EXCEPTION_MASK	0xF8000000
+#define FPC_FLAGS_MASK		0x00F80000
+#define FPC_DXC_MASK		0x0000FF00
+#define FPC_RM_MASK		0x00000003
 
 /* this typedef defines how a Program Status Word looks like */
-typedef struct 
-{
-        unsigned long mask;
-        unsigned long addr;
+typedef struct {
+	unsigned long mask;
+	unsigned long addr;
 } __attribute__ ((aligned(8))) psw_t;
 
 #ifndef __s390x__
@@ -282,33 +279,40 @@ typedef struct
 /*
  * The s390_regs structure is used to define the elf_gregset_t.
  */
-typedef struct
-{
+typedef struct {
 	psw_t psw;
 	unsigned long gprs[NUM_GPRS];
 	unsigned int  acrs[NUM_ACRS];
 	unsigned long orig_gpr2;
 } s390_regs;
 
+/*
+ * The user_pt_regs structure exports the beginning of
+ * the in-kernel pt_regs structure to user space.
+ */
+typedef struct {
+	unsigned long args[1];
+	psw_t psw;
+	unsigned long gprs[NUM_GPRS];
+} user_pt_regs;
+
 /*
  * Now for the user space program event recording (trace) definitions.
  * The following structures are used only for the ptrace interface, don't
  * touch or even look at it if you don't want to modify the user-space
  * ptrace interface. In particular stay away from it for in-kernel PER.
  */
-typedef struct
-{
+typedef struct {
 	unsigned long cr[NUM_CR_WORDS];
 } per_cr_words;
 
 #define PER_EM_MASK 0xE8000000UL
 
-typedef	struct
-{
+typedef struct {
 #ifdef __s390x__
-	unsigned                       : 32;
+	unsigned		       : 32;
 #endif /* __s390x__ */
-	unsigned em_branching          : 1;
+	unsigned em_branching	       : 1;
 	unsigned em_instruction_fetch  : 1;
 	/*
 	 * Switching on storage alteration automatically fixes
@@ -317,44 +321,41 @@ typedef	struct
 	unsigned em_storage_alteration : 1;
 	unsigned em_gpr_alt_unused     : 1;
 	unsigned em_store_real_address : 1;
-	unsigned                       : 3;
+	unsigned		       : 3;
 	unsigned branch_addr_ctl       : 1;
-	unsigned                       : 1;
+	unsigned		       : 1;
 	unsigned storage_alt_space_ctl : 1;
-	unsigned                       : 21;
+	unsigned		       : 21;
 	unsigned long starting_addr;
 	unsigned long ending_addr;
 } per_cr_bits;
 
-typedef struct
-{
+typedef struct {
 	unsigned short perc_atmid;
 	unsigned long address;
 	unsigned char access_id;
 } per_lowcore_words;
 
-typedef struct
-{
-	unsigned perc_branching          : 1;
+typedef struct {
+	unsigned perc_branching		 : 1;
 	unsigned perc_instruction_fetch  : 1;
 	unsigned perc_storage_alteration : 1;
-	unsigned perc_gpr_alt_unused     : 1;
+	unsigned perc_gpr_alt_unused	 : 1;
 	unsigned perc_store_real_address : 1;
-	unsigned                         : 3;
-	unsigned atmid_psw_bit_31        : 1;
-	unsigned atmid_validity_bit      : 1;
-	unsigned atmid_psw_bit_32        : 1;
-	unsigned atmid_psw_bit_5         : 1;
-	unsigned atmid_psw_bit_16        : 1;
-	unsigned atmid_psw_bit_17        : 1;
-	unsigned si                      : 2;
+	unsigned			 : 3;
+	unsigned atmid_psw_bit_31	 : 1;
+	unsigned atmid_validity_bit	 : 1;
+	unsigned atmid_psw_bit_32	 : 1;
+	unsigned atmid_psw_bit_5	 : 1;
+	unsigned atmid_psw_bit_16	 : 1;
+	unsigned atmid_psw_bit_17	 : 1;
+	unsigned si			 : 2;
 	unsigned long address;
-	unsigned                         : 4;
-	unsigned access_id               : 4;
+	unsigned			 : 4;
+	unsigned access_id		 : 4;
 } per_lowcore_bits;
 
-typedef struct
-{
+typedef struct {
 	union {
 		per_cr_words   words;
 		per_cr_bits    bits;
@@ -364,9 +365,9 @@ typedef struct
 	 * the kernel always sets them to zero. To enable single
 	 * stepping use ptrace(PTRACE_SINGLESTEP) instead.
 	 */
-	unsigned  single_step       : 1;
+	unsigned  single_step	    : 1;
 	unsigned  instruction_fetch : 1;
-	unsigned                    : 30;
+	unsigned		    : 30;
 	/*
 	 * These addresses are copied into cr10 & cr11 if single
 	 * stepping is switched off
@@ -376,11 +377,10 @@ typedef struct
 	union {
 		per_lowcore_words words;
 		per_lowcore_bits  bits;
-	} lowcore; 
+	} lowcore;
 } per_struct;
 
-typedef struct
-{
+typedef struct {
 	unsigned int  len;
 	unsigned long kernel_addr;
 	unsigned long process_addr;
@@ -390,12 +390,12 @@ typedef struct
  * S/390 specific non posix ptrace requests. I chose unusual values so
  * they are unlikely to clash with future ptrace definitions.
  */
-#define PTRACE_PEEKUSR_AREA           0x5000
-#define PTRACE_POKEUSR_AREA           0x5001
+#define PTRACE_PEEKUSR_AREA	      0x5000
+#define PTRACE_POKEUSR_AREA	      0x5001
 #define PTRACE_PEEKTEXT_AREA	      0x5002
 #define PTRACE_PEEKDATA_AREA	      0x5003
 #define PTRACE_POKETEXT_AREA	      0x5004
-#define PTRACE_POKEDATA_AREA 	      0x5005
+#define PTRACE_POKEDATA_AREA	      0x5005
 #define PTRACE_GET_LAST_BREAK	      0x5006
 #define PTRACE_PEEK_SYSTEM_CALL       0x5007
 #define PTRACE_POKE_SYSTEM_CALL	      0x5008
@@ -413,21 +413,19 @@ typedef struct
  * PT_PROT definition is loosely based on hppa bsd definition in
  * gdb/hppab-nat.c
  */
-#define PTRACE_PROT                       21
+#define PTRACE_PROT			  21
 
-typedef enum
-{
+typedef enum {
 	ptprot_set_access_watchpoint,
 	ptprot_set_write_watchpoint,
 	ptprot_disable_watchpoint
 } ptprot_flags;
 
-typedef struct
-{
+typedef struct {
 	unsigned long lowaddr;
 	unsigned long hiaddr;
 	ptprot_flags prot;
-} ptprot_area;                     
+} ptprot_area;
 
 /* Sequence of bytes for breakpoint illegal instruction.  */
 #define S390_BREAKPOINT     {0x0,0x1}
@@ -439,8 +437,7 @@ typedef struct
  * The user_regs_struct defines the way the user registers are
  * store on the stack for signal handling.
  */
-struct user_regs_struct
-{
+struct user_regs_struct {
 	psw_t psw;
 	unsigned long gprs[NUM_GPRS];
 	unsigned int  acrs[NUM_ACRS];

arch/score/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generic-y	+= bpf_perf_event.h
 generic-y	+= siginfo.h

arch/sh/include/uapi/asm/Kbuild

@@ -2,6 +2,7 @@
 include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/sparc/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generic-y += bpf_perf_event.h
 generic-y += types.h

arch/tile/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/unicore32/include/uapi/asm/Kbuild

@@ -3,6 +3,7 @@ include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += auxvec.h
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

arch/x86/include/uapi/asm/Kbuild

 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
+generic-y += bpf_perf_event.h
 generated-y += unistd_32.h
 generated-y += unistd_64.h
 generated-y += unistd_x32.h

arch/xtensa/include/uapi/asm/Kbuild

@@ -2,6 +2,7 @@
 include include/uapi/asm-generic/Kbuild.asm
 
 generic-y += bitsperlong.h
+generic-y += bpf_perf_event.h
 generic-y += errno.h
 generic-y += fcntl.h
 generic-y += ioctl.h

include/linux/perf_event.h

@@ -15,6 +15,7 @@
 #define _LINUX_PERF_EVENT_H
 
 #include <uapi/linux/perf_event.h>
+#include <uapi/linux/bpf_perf_event.h>
 
 /*
  * Kernel-internal data types and definitions:
@@ -787,7 +788,7 @@ struct perf_output_handle {
 };
 
 struct bpf_perf_event_data_kern {
-	struct pt_regs *regs;
+	bpf_user_pt_regs_t *regs;
 	struct perf_sample_data *data;
 	struct perf_event *event;
 };
@@ -1177,6 +1178,9 @@ extern void perf_bp_event(struct perf_event *event, void *data);
 		(user_mode(regs) ? PERF_RECORD_MISC_USER : PERF_RECORD_MISC_KERNEL)
 # define perf_instruction_pointer(regs)	instruction_pointer(regs)
 #endif
+#ifndef perf_arch_bpf_user_pt_regs
+# define perf_arch_bpf_user_pt_regs(regs) regs
+#endif
 
 static inline bool has_branch_stack(struct perf_event *event)
 {

include/uapi/asm-generic/bpf_perf_event.h

+#ifndef _UAPI__ASM_GENERIC_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_GENERIC_BPF_PERF_EVENT_H__
+
+#include <linux/ptrace.h>
+
+/* Export kernel pt_regs structure */
+typedef struct pt_regs bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_GENERIC_BPF_PERF_EVENT_H__ */

include/uapi/linux/bpf_perf_event.h

@@ -8,11 +8,10 @@
 #ifndef _UAPI__LINUX_BPF_PERF_EVENT_H__
 #define _UAPI__LINUX_BPF_PERF_EVENT_H__
 
-#include <linux/types.h>
-#include <linux/ptrace.h>
+#include <asm/bpf_perf_event.h>
 
 struct bpf_perf_event_data {
-	struct pt_regs regs;
+	bpf_user_pt_regs_t regs;
 	__u64 sample_period;
 };
 

kernel/events/core.c

@@ -7987,11 +7987,11 @@ static void bpf_overflow_handler(struct perf_event *event,
 {
 	struct bpf_perf_event_data_kern ctx = {
 		.data = data,
-		.regs = regs,
 		.event = event,
 	};
 	int ret = 0;
 
+	ctx.regs = perf_arch_bpf_user_pt_regs(regs);
 	preempt_disable();
 	if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1))
 		goto out;

tools/arch/arm64/include/uapi/asm/bpf_perf_event.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_BPF_PERF_EVENT_H__
+
+#include <asm/ptrace.h>
+
+typedef struct user_pt_regs bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */

tools/arch/s390/include/uapi/asm/bpf_perf_event.h

+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_BPF_PERF_EVENT_H__
+
+#include <asm/ptrace.h>
+
+typedef user_pt_regs bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */

tools/include/uapi/asm-generic/bpf_perf_event.h

+#ifndef _UAPI__ASM_GENERIC_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_GENERIC_BPF_PERF_EVENT_H__
+
+#include <linux/ptrace.h>
+
+/* Export kernel pt_regs structure */
+typedef struct pt_regs bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_GENERIC_BPF_PERF_EVENT_H__ */

tools/include/uapi/linux/bpf_perf_event.h

+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 /* Copyright (c) 2016 Facebook
  *
  * This program is free software; you can redistribute it and/or
@@ -7,11 +8,10 @@
 #ifndef _UAPI__LINUX_BPF_PERF_EVENT_H__
 #define _UAPI__LINUX_BPF_PERF_EVENT_H__
 
-#include <linux/types.h>
-#include <linux/ptrace.h>
+#include <asm/bpf_perf_event.h>
 
 struct bpf_perf_event_data {
-	struct pt_regs regs;
+	bpf_user_pt_regs_t regs;
 	__u64 sample_period;
 };
 

tools/perf/arch/s390/Makefile

@@ -2,3 +2,4 @@ ifndef NO_DWARF
 PERF_HAVE_DWARF_REGS := 1
 endif
 HAVE_KVM_STAT_SUPPORT := 1
+PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET := 1

tools/perf/arch/s390/util/dwarf-regs.c

@@ -2,17 +2,43 @@
 /*
  * Mapping of DWARF debug register numbers into register names.
  *
- *    Copyright IBM Corp. 2010
- *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
+ * Copyright IBM Corp. 2010, 2017
+ * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>,
+ *	      Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
  *
  */
 
+#include <errno.h>
 #include <stddef.h>
-#include <dwarf-regs.h>
+#include <stdlib.h>
 #include <linux/kernel.h>
+#include <asm/ptrace.h>
+#include <string.h>
+#include <dwarf-regs.h>
 #include "dwarf-regs-table.h"
 
 const char *get_arch_regstr(unsigned int n)
 {
 	return (n >= ARRAY_SIZE(s390_dwarf_regs)) ? NULL : s390_dwarf_regs[n];
 }
+
+/*
+ * Convert the register name into an offset to struct pt_regs (kernel).
+ * This is required by the BPF prologue generator.  The BPF
+ * program is called in the BPF overflow handler in the perf
+ * core.
+ */
+int regs_query_register_offset(const char *name)
+{
+	unsigned long gpr;
+
+	if (!name || strncmp(name, "%r", 2))
+		return -EINVAL;
+
+	errno = 0;
+	gpr = strtoul(name + 2, NULL, 10);
+	if (errno || gpr >= 16)
+		return -EINVAL;
+
+	return offsetof(user_pt_regs, gprs) + 8 * gpr;
+}

tools/perf/check-headers.sh

@@ -30,6 +30,7 @@ arch/x86/include/uapi/asm/vmx.h
 arch/powerpc/include/uapi/asm/kvm.h
 arch/s390/include/uapi/asm/kvm.h
 arch/s390/include/uapi/asm/kvm_perf.h
+arch/s390/include/uapi/asm/ptrace.h
 arch/s390/include/uapi/asm/sie.h
 arch/arm/include/uapi/asm/kvm.h
 arch/arm64/include/uapi/asm/kvm.h

tools/testing/selftests/bpf/Makefile

 # SPDX-License-Identifier: GPL-2.0
+
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+endif
+include $(srctree)/tools/scripts/Makefile.arch
+
+$(call detected_var,SRCARCH)
+
 LIBDIR := ../../../lib
 BPFDIR := $(LIBDIR)/bpf
 APIDIR := ../../../include/uapi
+ASMDIR:= ../../../arch/$(ARCH)/include/uapi
 GENDIR := ../../../../include/generated
 GENHDR := $(GENDIR)/autoconf.h
 
@@ -9,7 +21,7 @@ ifneq ($(wildcard $(GENHDR)),)
   GENFLAGS := -DHAVE_GENHDR
 endif
 
-CFLAGS += -Wall -O2 -I$(APIDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include
+CFLAGS += -Wall -O2 -I$(APIDIR) -I$(ASMDIR) -I$(LIBDIR) -I$(GENDIR) $(GENFLAGS) -I../../../include
 LDLIBS += -lcap -lelf
 
 TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test_progs \