[PATCH] ARC: bpf: define uapi for BPF_PROG_TYPE_PERF_EVENT program type

[PATCH] ARC: bpf: define uapi for BPF_PROG_TYPE_PERF_EVENT program type

[Sergey Matyukevich]

From: Sergey Matyukevich <sergey.matyukevich@synopsys.com>

Define appropriate uapi for the BPF_PROG_TYPE_PERF_EVENT program type
by exporting the user_regs_struct structure instead of the pt_regs
structure that is in-kernel only.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com>
---

Originally I sent this patch via linux-snps-arc mailing list: see [1].
However this patch accompanies ARC support for libbpf bpf_tracing.h
accepted to bpf kernel tree: see [2].

So it looks like it makes sense to post this patch here as well.
I will also update linux-snps-arc patch series accordingly.

Regards,
Sergey

[1] https://lore.kernel.org/linux-snps-arc/20220408155804.587197-1-geomatsi@gmail.com/
[2] https://lore.kernel.org/bpf/20220408224442.599566-1-geomatsi@gmail.com/ 


 arch/arc/include/asm/perf_event.h          | 4 ++++
 arch/arc/include/uapi/asm/bpf_perf_event.h | 9 +++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 arch/arc/include/uapi/asm/bpf_perf_event.h

diff --git a/arch/arc/include/asm/perf_event.h b/arch/arc/include/asm/perf_event.h
index 4c919c0f4b30..d5719a260864 100644
--- a/arch/arc/include/asm/perf_event.h
+++ b/arch/arc/include/asm/perf_event.h
@@ -63,4 +63,8 @@ struct arc_reg_cc_build {
 
 #define PERF_COUNT_ARC_HW_MAX	(PERF_COUNT_HW_MAX + 8)
 
+#ifdef CONFIG_PERF_EVENTS
+#define perf_arch_bpf_user_pt_regs(regs) (struct user_regs_struct *)regs
+#endif
+
 #endif /* __ASM_PERF_EVENT_H */
diff --git a/arch/arc/include/uapi/asm/bpf_perf_event.h b/arch/arc/include/uapi/asm/bpf_perf_event.h
new file mode 100644
index 000000000000..6cb1c2823288
--- /dev/null
+++ b/arch/arc/include/uapi/asm/bpf_perf_event.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_BPF_PERF_EVENT_H__
+
+#include <asm/ptrace.h>
+
+typedef struct user_regs_struct bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */
-- 
2.35.1

Re: [PATCH] ARC: bpf: define uapi for BPF_PROG_TYPE_PERF_EVENT program type

[Vineet Gupta]

On 4/14/22 01:11, Sergey Matyukevich wrote:
> From: Sergey Matyukevich <sergey.matyukevich@synopsys.com>
>
> Define appropriate uapi for the BPF_PROG_TYPE_PERF_EVENT program type
> by exporting the user_regs_struct structure instead of the pt_regs
> structure that is in-kernel only.
>
> Signed-off-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com>
> ---
>
> Originally I sent this patch via linux-snps-arc mailing list: see [1].
> However this patch accompanies ARC support for libbpf bpf_tracing.h
> accepted to bpf kernel tree: see [2].
>
> So it looks like it makes sense to post this patch here as well.
> I will also update linux-snps-arc patch series accordingly.
>
> Regards,
> Sergey

Applied !

Thx,
-Vineet

>
> [1] https://lore.kernel.org/linux-snps-arc/20220408155804.587197-1-geomatsi@gmail.com/
> [2] https://lore.kernel.org/bpf/20220408224442.599566-1-geomatsi@gmail.com/
>
>
>   arch/arc/include/asm/perf_event.h          | 4 ++++
>   arch/arc/include/uapi/asm/bpf_perf_event.h | 9 +++++++++
>   2 files changed, 13 insertions(+)
>   create mode 100644 arch/arc/include/uapi/asm/bpf_perf_event.h
>
> diff --git a/arch/arc/include/asm/perf_event.h b/arch/arc/include/asm/perf_event.h
> index 4c919c0f4b30..d5719a260864 100644
> --- a/arch/arc/include/asm/perf_event.h
> +++ b/arch/arc/include/asm/perf_event.h
> @@ -63,4 +63,8 @@ struct arc_reg_cc_build {
>   
>   #define PERF_COUNT_ARC_HW_MAX	(PERF_COUNT_HW_MAX + 8)
>   
> +#ifdef CONFIG_PERF_EVENTS
> +#define perf_arch_bpf_user_pt_regs(regs) (struct user_regs_struct *)regs
> +#endif
> +
>   #endif /* __ASM_PERF_EVENT_H */
> diff --git a/arch/arc/include/uapi/asm/bpf_perf_event.h b/arch/arc/include/uapi/asm/bpf_perf_event.h
> new file mode 100644
> index 000000000000..6cb1c2823288
> --- /dev/null
> +++ b/arch/arc/include/uapi/asm/bpf_perf_event.h
> @@ -0,0 +1,9 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
> +#define _UAPI__ASM_BPF_PERF_EVENT_H__
> +
> +#include <asm/ptrace.h>
> +
> +typedef struct user_regs_struct bpf_user_pt_regs_t;
> +
> +#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */