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Tue, 22 Jul 2025 08:57:00 +0000 (GMT) From: Aditya Bodkhe To: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, rostedt@goodmis.org, mhiramat@kernel.org, mark.rutland@arm.com, venkat88@linux.ibm.com, Hari Bathini , Aditya Bodkhe Subject: [PATCH v2 2/2] powerpc/fprobe: fix updated fprobe for function-graph tracer Date: Tue, 22 Jul 2025 14:26:48 +0530 Message-ID: <20250722085648.1640-2-adityab1@linux.ibm.com> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250722085648.1640-1-adityab1@linux.ibm.com> References: <20250722085648.1640-1-adityab1@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzIyMDA3MSBTYWx0ZWRfX+j3SfIQTa1HU dyh+hlxgIT1HFy4bkK9Jm6O8wQjES4X2iM6ZRjdVCKsS2CiGO6Yk+FeQ2c0X0X2AsNVSddBj8aq rFTDSkHpXcHOYE4nUMFis2viuoCLu2LxDwkDfptGF5y1HSnb4BALLea0shm3xjMVw2BtB3Drqg+ e8wyftxHKddariMVxfe/xps8fXCn10/W7q+D5QkakJQe14n6c2IbpXJeSEBtd781ipBkwV3eYO3 1t189Wh3Jew7AyF5WiAbjj4yaXTWk3mFvPkb0Y8WCngr0NnNcgUObyVTq/YYvX/4JEfy4Pkw0ze EtgHUL9vmQcvsTJ/6BkP0m4zl7pfrTVl2ZH/8g9PQEp64oRsKoRzyd5lF/DJCUVUy7u/aVTB6P0 +B/wYqcn1dtrvSIsGG+0sOyXGP+4N8XNejhpEr+dABIaqXmFDAVrngMZREE6CMlstGEqYK3a X-Proofpoint-ORIG-GUID: k5Pq5Gutfr422_L3YlQ_jpgECrKiYigz X-Authority-Analysis: v=2.4 cv=cIDgskeN c=1 sm=1 tr=0 ts=687f5263 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=Wb1JkmetP80A:10 a=VnNF1IyMAAAA:8 a=eJdZZeSqwtc_5qrUTOUA:9 X-Proofpoint-GUID: 0h7k1LtYsY36usoiqbCTrOIEOf02aPNa X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-07-22_01,2025-07-21_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 mlxlogscore=633 mlxscore=0 spamscore=0 suspectscore=0 adultscore=0 phishscore=0 impostorscore=0 bulkscore=0 lowpriorityscore=0 priorityscore=1501 clxscore=1015 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507220071 From: Hari Bathini Since commit 4346ba160409 ("fprobe: Rewrite fprobe on function-graph tracer"), FPROBE depends on HAVE_FUNCTION_GRAPH_FREGS. With previous patch adding HAVE_FUNCTION_GRAPH_FREGS for powerpc, FPROBE can be enabled on powerpc. But with the commit b5fa903b7f7c ("fprobe: Add fprobe_header encoding feature"), asm/fprobe.h header is needed to define arch dependent encode/decode macros. The fprobe header MSB pattern on powerpc is not 0xf. So, define FPROBE_HEADER_MSB_PATTERN expected on powerpc. Also, commit 762abbc0d09f ("fprobe: Use ftrace_regs in fprobe exit handler") introduced HAVE_FTRACE_REGS_HAVING_PT_REGS for archs that have pt_regs in ftrace_regs. Advertise that on powerpc to reuse common definitions like ftrace_partial_regs(). Signed-off-by: Hari Bathini Signed-off-by: Aditya Bodkhe --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/fprobe.h | 12 ++++++++++++ 2 files changed, 13 insertions(+) create mode 100644 arch/powerpc/include/asm/fprobe.h diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 9163521bc4b9..2203e4fb64c1 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -246,6 +246,7 @@ config PPC select HAVE_EFFICIENT_UNALIGNED_ACCESS select HAVE_GUP_FAST select HAVE_FTRACE_GRAPH_FUNC + select HAVE_FTRACE_REGS_HAVING_PT_REGS select HAVE_FTRACE_MCOUNT_RECORD select HAVE_FUNCTION_ARG_ACCESS_API select HAVE_FUNCTION_DESCRIPTORS if PPC64_ELF_ABI_V1 diff --git a/arch/powerpc/include/asm/fprobe.h b/arch/powerpc/include/asm/fprobe.h new file mode 100644 index 000000000000..d64bc28fb3d3 --- /dev/null +++ b/arch/powerpc/include/asm/fprobe.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_PPC_FPROBE_H +#define _ASM_PPC_FPROBE_H + +#include + +#ifdef CONFIG_64BIT +#undef FPROBE_HEADER_MSB_PATTERN +#define FPROBE_HEADER_MSB_PATTERN (PAGE_OFFSET & ~FPROBE_HEADER_MSB_MASK) +#endif + +#endif /* _ASM_PPC_FPROBE_H */ -- 2.50.0