linux-kernel - [PATCH v2 3/6] arm64/bpf: correct broken uapi for BPF_PROG_TYPE_PERF

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Message-Id: <1512381409-19775-4-git-send-email-brueckner@linux.vnet.ibm.com>
Date:   Mon,  4 Dec 2017 10:56:46 +0100
From:   Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Will Deacon <will.deacon@....com>,
        Ingo Molnar <mingo@...hat.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH v2 3/6] arm64/bpf: correct broken uapi for BPF_PROG_TYPE_PERF_EVENT program type

Correct the broken uapi for the BPF_PROG_TYPE_PERF_EVENT program type
by exporting the user_pt_regs structure instead of the pt_regs structure
that is in-kernel only.

Signed-off-by: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
Reviewed-by: Thomas Richter <tmricht@...ux.vnet.ibm.com>
Acked-by: Alexei Starovoitov <ast@...nel.org>
Cc: Will Deacon <will.deacon@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
---
 arch/arm64/include/asm/perf_event.h          | 2 ++
 arch/arm64/include/uapi/asm/bpf_perf_event.h | 9 +++++++++
 2 files changed, 11 insertions(+)
 create mode 100644 arch/arm64/include/uapi/asm/bpf_perf_event.h

diff --git a/arch/arm64/include/asm/perf_event.h b/arch/arm64/include/asm/perf_event.h
index 8d5cbec..f9ccc36 100644
--- a/arch/arm64/include/asm/perf_event.h
+++ b/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 @@
 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) { \
diff --git a/arch/arm64/include/uapi/asm/bpf_perf_event.h b/arch/arm64/include/uapi/asm/bpf_perf_event.h
new file mode 100644
index 0000000..b551b74
--- /dev/null
+++ b/arch/arm64/include/uapi/asm/bpf_perf_event.h
@@ -0,0 +1,9 @@
+/* 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__ */
-- 
1.8.3.1