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(unknown [180.110.112.93]) by APP-05 (Coremail) with SMTP id zQCowACHjeVp9pRmxFxsAw--.40406S2; Mon, 15 Jul 2024 18:14:02 +0800 (CST) From: Zhu Hengbo To: Paul Walmsley , Palmer Dabbelt , Albert Ou , Zhu Hengbo , Suren Baghdasaryan , Alexandre Ghiti , Andrew Morton , Kefeng Wang , "Matthew Wilcox (Oracle)" , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] riscv: add tracepoints for page fault Date: Mon, 15 Jul 2024 10:13:55 +0000 Message-Id: <20240715101400.39103-1-zhuhengbo@iscas.ac.cn> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: zQCowACHjeVp9pRmxFxsAw--.40406S2 X-Coremail-Antispam: 1UD129KBjvJXoWxWF45Gr18ZrWrKw1rtw17trb_yoWrZr4rpF nFkF95Gr47Xwsa93yxuw1qyF15AanYyayjgry7Gw4Yvw4IqryUAws2vrWDtryxGr1kGFyI 9F4Yyrya9w15u3JanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvj14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r1j6r1xM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0 I7IYx2IY67AKxVWUAVWUtwAv7VC2z280aVAFwI0_Cr0_Gr1UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2 Y2ka0xkIwI1l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4 xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43 MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I 0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY6I8E87Iv67AKxVWU JVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjfUwr WFUUUUU X-CM-SenderInfo: x2kxxvpqje0q5lvft2wodfhubq/ Content-Type: text/plain; charset="utf-8" Introduce page_fault_user and page_fault_kernel for riscv page fault. Help to get more detail information when page fault happen. --- Simple test go below: root@riscv-ubuntu2204 ~ # bin/perf list | grep exceptions exceptions:page_fault_kernel [Tracepoint event] exceptions:page_fault_user [Tracepoint event] root@riscv-ubuntu2204 ~ # bin/perf record -e exceptions:page_fault_kernel -= e exceptions:page_fault_user [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.091 MB perf.data (19 samples) ] perf report tracepoint: perf 826 [007] 894.795520: exceptions:page_fault_user: user page fa= ult, address=3D0x7fff95af4400 cause=3D0xd perf 826 [007] 894.795970: exceptions:page_fault_user: user page fa= ult, address=3D0x7fff95a73400 cause=3D0xd perf 826 [007] 894.796738: exceptions:page_fault_user: user page fa= ult, address=3D0x7fff959f2400 cause=3D0xd perf 826 [007] 894.797088: exceptions:page_fault_user: user page fa= ult, address=3D0x7fff95971400 cause=3D0xd perf 826 [007] 894.797273: exceptions:page_fault_user: user page fa= ult, address=3D0x7fff958f0400 cause=3D0xd perf 826 [007] 894.797445: exceptions:page_fault_user: user page fa= ult, address=3D0x7fff9586f400 cause=3D0xd perf 826 [007] 894.797998: exceptions:page_fault_kernel: kernel page = fault, address=3D0x7fff95870000 cause=3D0xd Signed-off-by: Zhu Hengbo --- arch/riscv/include/asm/trace/exceptions.h | 60 +++++++++++++++++++++++ arch/riscv/mm/fault.c | 15 ++++++ 2 files changed, 75 insertions(+) create mode 100644 arch/riscv/include/asm/trace/exceptions.h diff --git a/arch/riscv/include/asm/trace/exceptions.h b/arch/riscv/include= /asm/trace/exceptions.h new file mode 100644 index 000000000000..a9a68d471703 --- /dev/null +++ b/arch/riscv/include/asm/trace/exceptions.h @@ -0,0 +1,60 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Tracepoints for RISC-V exceptions + * + * Copyright (C) 2024 ISCAS. All rights reserved + * + */ + +#if !defined(_TRACE_PAGE_FAULT_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_PAGE_FAULT_H + +#include + +#undef TRACE_SYSTEM +#define TRACE_SYSTEM exceptions + +TRACE_EVENT(page_fault_user, + TP_PROTO(struct pt_regs *regs), + TP_ARGS(regs), + + TP_STRUCT__entry( + __field(unsigned long, address) + __field(unsigned long, cause) + ), + + TP_fast_assign( + __entry->address =3D regs->badaddr; + __entry->cause =3D regs->cause; + ), + + TP_printk("user page fault, address=3D%ps cause=3D0x%lx", + (void *)__entry->address, __entry->cause) +); + +TRACE_EVENT(page_fault_kernel, + TP_PROTO(struct pt_regs *regs), + TP_ARGS(regs), + + TP_STRUCT__entry( + __field(unsigned long, address) + __field(unsigned long, cause) + ), + + TP_fast_assign( + __entry->address =3D regs->badaddr; + __entry->cause =3D regs->cause; + ), + + TP_printk("kernel page fault, address=3D%ps cause=3D0x%lx", + (void *)__entry->address, __entry->cause) +); + +#undef TRACE_INCLUDE_PATH +#undef TRACE_INCLUDE_FILE +#define TRACE_INCLUDE_PATH asm/trace/ +#define TRACE_INCLUDE_FILE exceptions +#endif /* _TRACE_PAGE_FAULT_H */ + +/* This part must be outside protection */ +#include diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index 5224f3733802..22874074c5bc 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -22,6 +22,10 @@ =20 #include "../kernel/head.h" =20 + +#define CREATE_TRACE_POINTS +#include + static void die_kernel_fault(const char *msg, unsigned long addr, struct pt_regs *regs) { @@ -215,6 +219,15 @@ static inline bool access_error(unsigned long cause, s= truct vm_area_struct *vma) return false; } =20 + +static inline void trace_page_fault(struct pt_regs *regs) +{ + if (user_mode(regs)) + trace_page_fault_user(regs); + else + trace_page_fault_kernel(regs); +} + /* * This routine handles page faults. It determines the address and the * problem, and then passes it off to one of the appropriate routines. @@ -235,6 +248,8 @@ void handle_page_fault(struct pt_regs *regs) tsk =3D current; mm =3D tsk->mm; =20 + trace_page_fault(regs); + if (kprobe_page_fault(regs, cause)) return; =20 --=20 2.34.1