From nobody Tue Feb 10 04:12:30 2026 Received: from invmail4.hynix.com (exvmail4.hynix.com [166.125.252.92]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 7B04E2459F9; Tue, 13 May 2025 10:07:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=166.125.252.92 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747130873; cv=none; b=RidrudEs4mygV3ub85GrONb6nOBegA7euC6NMZz4tJaPIHk2Djgv8pizSr0ZBQL4TqA1io8SFl70jCp2SMTD5s8USuK+cXz/LNIQd5itGIQq9RyfheQgbDZKkAUD4eXO81KbDfim8TfT/hSk4CCdF6BW51CHSB6QB5ynt5hQnUs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747130873; c=relaxed/simple; bh=8SxiXT7aMr/Jndlc0Cvu8YV+kxqp+XaubTMN75I/AOI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=s/XujMkl7vYkARKsDXnclsC95OaUaVlEn89AEmbsJEx+E4dNO4kk4aWyiLgZ1Onbl8h0lYlcKL6wOORL7/VFOy9Cute4OerJdsCtED8NlO9+InwF6AjExpFOvvUumVXIunY2DqO8s2iXCt3F9cmxDXOxXZsxOoeyLdXRE1hJe8o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com; spf=pass smtp.mailfrom=sk.com; arc=none smtp.client-ip=166.125.252.92 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sk.com X-AuditID: a67dfc5b-669ff7000002311f-3a-682319ee2425 From: Byungchul Park To: linux-kernel@vger.kernel.org Cc: kernel_team@skhynix.com, torvalds@linux-foundation.org, damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, gregkh@linuxfoundation.org, kernel-team@lge.com, linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org, jglisse@redhat.com, dennis@kernel.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com, harry.yoo@oracle.com, chris.p.wilson@intel.com, gwan-gyeong.mun@intel.com, max.byungchul.park@gmail.com, boqun.feng@gmail.com, longman@redhat.com, yskelg@gmail.com, yunseong.kim@ericsson.com, yeoreum.yun@arm.com, netdev@vger.kernel.org, matthew.brost@intel.com, her0gyugyu@gmail.com Subject: [PATCH v15 08/43] x86_64, dept: add support CONFIG_ARCH_HAS_DEPT_SUPPORT to x86_64 Date: Tue, 13 May 2025 19:06:55 +0900 Message-Id: <20250513100730.12664-9-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250513100730.12664-1-byungchul@sk.com> References: <20250513100730.12664-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSf0yMcRzHfZ/nued5Op09O60eMj/O7yjOwmeG+TlPYtPMJmXc9NTdVHKX fthYp6McJaaiX65wpS7qyuRHLZnTj8nRqSShEamrKXeTfnDV/PPZa+/3e+/PP28aF5sEM2lF eCSvDJeFSkghIbQ653r2zZgvX/k1eznYfiUSkHXPQIL5bhECQ7kag+7nO6DF3otg+OUrHNJT zQhyP3/AodzUgaCy4AwJTV+mgcXWT0Jd6gUS4m/eI+F1zwgG7WlXMCgy7oaP+i4CGlLyMEjv JiEzPR5znO8YDOkLKdDHLYTOggwKRj5Loa6jWQCVbcvgek47CU8q6wgwVXRi0PQoi4QOw18B NJhqCbAnu4P5cpIAivvySOix63HQ2/opeFOtw8Ckc4USjaPw3OCYAF4kVWNw7lYpBpZ3jxFU JX7CwGhoJuGZrReDMmMqDn/ynyPoTLZScPbiEAWZ6mQEF86mEaBpXw3Dvx2fs39JQX2jhIDi 0Wa0aQNnyDEg7llvP85pyqK5P7a3JFdp1xFcfR7LPcz4QHGaqjaK0xlPcGUFHtzNJ90Ylztg E3DGwvMkZxy4QnFaqwXj+hobqT2zDgjXB/GhiiheuWLjYaH8fbaViKh3iRmOv03EoR+MFjnR LOPNjlVU4FpET/DVDNW4TDKL2dbWIXycXZi5bFlSl0CLhDTONE9lW7LfoXFjOhPAtr+6PMEE s5AdffuGGGcRs5rV3C8kJ/vnsEUl1RNFTswadjS/cSIjdmRSdEXEZCbdidVqAid5Bvu0oJVI QSIdmlKIxIrwqDCZItTbSx4brojxOnIszIgc69KfGgmoQAPmvTWIoZHEWVTbPU8uFsiiVLFh NYilcYmLSP3AIYmCZLEneeWxQ8oTobyqBrnThMRNtMoeHSRmQmSR/FGej+CV/12MdpoZhzbn otYd0cHO/KVFWRFyc+m6+VcX+H3p2pU2drg3sC/zdv3swaUtu65vOe0rjftWXrI1MWrfwYQx ssU9xI+S7p7+LdBS5W89Xmq9FlwTktCY8D0ksmrY37s4z37np327xc0n2H9n24G1SzLNXU3B i7b2bHztk+/rrMY9Xfm95/3o/dskhEouk3rgSpXsH/5nLBBZAwAA X-Brightmail-Tracker: H4sIAAAAAAAAAzWSfUzMcRzH+/6eO85+O+GHeegsNs1DKJ8ta4bNz0NiszE2+uE3d1yX3Sll Q7nTuJSKUyKucKUOuSvloZxaqVDRM+eomUlPG91NKrna/PPea+/3e+/PPx8Gl90jZzFK9XFR oxZUckpCSLYF65b0z1ygWP7y41RwDZ4n4MZDCwWNDwoQWIriMeiu2ght7l4Ew28bcEg3NiLI 7vyEQ1G1E0FZ3lkKmr5OgWbXAAW1xkQKdLcfUvCuZwQDx9U0DAqsofDZ/I2A1yk5GKR3U3A9 XYd55DsGQ+Z8GsxxftCVl0nDSGcA1DpbSajMqiWh7IM/XLvpoOB5WS0B1aVdGDQ9vUGB0zJG wuvqGgLcybOhMTWJhPv9ORT0uM04mF0DNLy3mzCoNk2HQr1nNeHXXxJeJdkxSLjzCIPmjmcI ys9/wcBqaaWg0tWLgc1qxOFPbhWCruQ+Gs5dHKLhenwygsRzVwnQOwJh+LfnctZgAMTfKiTg /mgrWhvCW25aEF/ZO4DzetsJ/o+rheLL3CaCr8vh+CeZn2heX/6B5k3WKN6Wt5i//bwb47N/ ukjemn+B4q0/02je0NeM8f319fT2OXskaw6JKmW0qFkWEi5RfMzqI47V+cQM6+4ScegHa0AM w7GruCuZWgPyZih2EdfePoSPsw87n7MlfSMNSMLgbOskri2rA40HU9m9nKMhdYIJ1o8bbXlP jLOUDeT0xfnUOHPsPK6g0D4x5M0GcaO59RMdmaeTYiogUpDEhLzykY9SHR0hKFWBS7VHFbFq ZczSg5ERVuR5IPOpkdRSNNi0sQKxDJJPltZ0+ypkpBCtjY2oQByDy32k8SUeS3pIiD0paiL3 a6JUorYCzWYI+Qzp5l1iuIw9LBwXj4riMVHzP8UY71lx6G34iqQx4U1iKCl2SMYafgcFdBaf znGE+Knc61cnvBLCDGe3rseJfQvb645sSF/rP6YxFmUoHkdNNr/w3Tv3R+i9B7kzttXonU5Z VUOYXT3lUm4LOcfrb3ByYqqC3Gn0kqbp/M94hx6YtmTHyjbXulLp1y12v9X2gchN5ZdtGSW7 5YRWIQQsxjVa4R+GEGaMPAMAAA== X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" dept needs to notice every entrance from user to kernel mode to treat every kernel context independently when tracking wait-event dependencies. Roughly, system call and user oriented fault are the cases. Make dept aware of the entrances of x86_64 and add support CONFIG_ARCH_HAS_DEPT_SUPPORT to x86_64. Signed-off-by: Byungchul Park --- arch/x86/Kconfig | 1 + arch/x86/entry/syscall_64.c | 7 +++++++ arch/x86/mm/fault.c | 7 +++++++ 3 files changed, 15 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5873c9e39919..4b6d9e59d96c 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -38,6 +38,7 @@ config X86_64 select ARCH_HAS_ELFCORE_COMPAT select ZONE_DMA32 select EXECMEM if DYNAMIC_FTRACE + select ARCH_HAS_DEPT_SUPPORT =20 config FORCE_DYNAMIC_FTRACE def_bool y diff --git a/arch/x86/entry/syscall_64.c b/arch/x86/entry/syscall_64.c index b6e68ea98b83..66bd5af5aff1 100644 --- a/arch/x86/entry/syscall_64.c +++ b/arch/x86/entry/syscall_64.c @@ -8,6 +8,7 @@ #include #include #include +#include =20 #define __SYSCALL(nr, sym) extern long __x64_##sym(const struct pt_regs *); #define __SYSCALL_NORETURN(nr, sym) extern long __noreturn __x64_##sym(con= st struct pt_regs *); @@ -86,6 +87,12 @@ static __always_inline bool do_syscall_x32(struct pt_reg= s *regs, int nr) /* Returns true to return using SYSRET, or false to use IRET */ __visible noinstr bool do_syscall_64(struct pt_regs *regs, int nr) { + /* + * This is a system call from user mode. Make dept work with a + * new kernel mode context. + */ + dept_update_cxt(); + add_random_kstack_offset(); nr =3D syscall_enter_from_user_mode(regs, nr); =20 diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 296d294142c8..241537ce47fe 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -20,6 +20,7 @@ #include #include /* find_and_lock_vma() */ #include +#include =20 #include /* boot_cpu_has, ... */ #include /* dotraplinkage, ... */ @@ -1220,6 +1221,12 @@ void do_user_addr_fault(struct pt_regs *regs, tsk =3D current; mm =3D tsk->mm; =20 + /* + * This fault comes from user mode. Make dept work with a new + * kernel mode context. + */ + dept_update_cxt(); + if (unlikely((error_code & (X86_PF_USER | X86_PF_INSTR)) =3D=3D X86_PF_IN= STR)) { /* * Whoops, this is kernel mode code trying to execute from --=20 2.17.1