From nobody Sun Apr 5 16:31:34 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 95CD9ECAAD3 for ; Fri, 16 Sep 2022 02:56:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229771AbiIPC4B (ORCPT ); Thu, 15 Sep 2022 22:56:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229588AbiIPCzv (ORCPT ); Thu, 15 Sep 2022 22:55:51 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5DD229A6BF for ; Thu, 15 Sep 2022 19:55:50 -0700 (PDT) Received: from localhost.localdomain (unknown [113.200.148.30]) by localhost.localdomain (Coremail) with SMTP id AQAAf8CxbWul5SNj08gaAA--.56059S8; Fri, 16 Sep 2022 10:55:42 +0800 (CST) From: Qing Zhang To: Huacai Chen , Steven Rostedt , Ingo Molnar Cc: WANG Xuerui , loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v4 06/10] LoongArch/ftrace: Add HAVE_DYNAMIC_FTRACE_WITH_ARGS support Date: Fri, 16 Sep 2022 10:55:29 +0800 Message-Id: <20220916025533.18771-7-zhangqing@loongson.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220916025533.18771-1-zhangqing@loongson.cn> References: <20220916025533.18771-1-zhangqing@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf8CxbWul5SNj08gaAA--.56059S8 X-Coremail-Antispam: 1UD129KBjvJXoWxZrW3XFW3WrykGFWrWw13XFb_yoW5AF1DpF yIy3Z8JF47uFsa9asF9Fy5Wrs8Jr97C34avayxJa4rAr1DXFyUZr1xZr1DXFyUt3s7G3yI vFyrKwnxCF45X3JanT9S1TB71UUUUUJqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUmqb7Iv0xC_tr1lb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI 8067AKxVWUAVCq3wA2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28C jxkF64kEwVA0rcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVW7JVWDJwA2z4x0Y4vE2Ix0cI 8IcVCY1x0267AKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vE x4A2jsIEc7CjxVAFwI0_GcCE3s1ln4kS14v26r1Y6r17M2AIxVAIcxkEcVAq07x20xvEnc xIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r126r1DMcIj6I8E 87Iv67AKxVW8JVWxJwAm72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lc2xSY4 AK67AK6r4UMxAIw28IcxkI7VAKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMxCIbckI1I0E 14v26r1Y6r17MI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_JrI_JrWlx4 CE17CEb7AF67AKxVWUAVWUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14v26r4j6ryU MIIF0xvE2Ix0cI8IcVCY1x0267AKxVWxJVW8Jr1lIxAIcVCF04k26cxKx2IYs7xG6r1j6r 1xMIIF0xvEx4A2jsIE14v26r4j6F4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr1j6F4UJbIY CTnIWIevJa73UjIFyTuYvjxU4JKsUUUUU X-CM-SenderInfo: x2kd0wptlqwqxorr0wxvrqhubq/ Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Allow for arguments to be passed in to ftrace_regs by default, If this is set, then arguments and stack can be found from the pt_regs. 1. HAVE_DYNAMIC_FTRACE_WITH_ARGS don't need special hook for graph tracer entry point, but instead we can use graph_ops::func function to install the return_hooker. 2. Livepatch requires this option in the future. Signed-off-by: Qing Zhang --- arch/loongarch/Kconfig | 1 + arch/loongarch/include/asm/ftrace.h | 17 +++++++++++++++++ arch/loongarch/kernel/ftrace_dyn.c | 12 ++++++++++++ 3 files changed, 30 insertions(+) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 2f70f98b18be..40bbc9a08969 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -89,6 +89,7 @@ config LOONGARCH select HAVE_DEBUG_STACKOVERFLOW select HAVE_DMA_CONTIGUOUS select HAVE_DYNAMIC_FTRACE + select HAVE_DYNAMIC_FTRACE_WITH_ARGS select HAVE_DYNAMIC_FTRACE_WITH_REGS select HAVE_EBPF_JIT select HAVE_EXIT_THREAD diff --git a/arch/loongarch/include/asm/ftrace.h b/arch/loongarch/include/a= sm/ftrace.h index a3f974a7a5ce..5cc13ae48164 100644 --- a/arch/loongarch/include/asm/ftrace.h +++ b/arch/loongarch/include/asm/ftrace.h @@ -15,6 +15,23 @@ extern void _mcount(void); #define mcount _mcount #endif =20 +#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS +struct ftrace_ops; + +struct ftrace_regs { + struct pt_regs regs; +}; + +static __always_inline struct pt_regs *arch_ftrace_get_regs(struct ftrace_= regs *fregs) +{ + return &fregs->regs; +} + +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs); +#define ftrace_graph_func ftrace_graph_func +#endif + #ifdef CONFIG_DYNAMIC_FTRACE static inline unsigned long ftrace_call_adjust(unsigned long addr) { diff --git a/arch/loongarch/kernel/ftrace_dyn.c b/arch/loongarch/kernel/ftr= ace_dyn.c index ec3d951be50c..f538829312d7 100644 --- a/arch/loongarch/kernel/ftrace_dyn.c +++ b/arch/loongarch/kernel/ftrace_dyn.c @@ -144,6 +144,17 @@ void prepare_ftrace_return(unsigned long self_addr, un= signed long *parent) *parent =3D return_hooker; } =20 +#ifdef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS +void ftrace_graph_func(unsigned long ip, unsigned long parent_ip, + struct ftrace_ops *op, struct ftrace_regs *fregs) +{ + struct pt_regs *regs =3D &fregs->regs; + unsigned long *parent =3D (unsigned long *)®s->regs[1]; + + prepare_ftrace_return(ip, (unsigned long *)parent); +} +#else + static int ftrace_modify_graph_caller(bool enable) { unsigned long pc, func; @@ -170,4 +181,5 @@ int ftrace_disable_ftrace_graph_caller(void) { return ftrace_modify_graph_caller(false); } +#endif /* CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS */ #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ --=20 2.36.1