From 27600805e62f800bacf990354632eae4e487d34c Mon Sep 17 00:00:00 2001 From: Yazen Ghannam Date: Thu, 3 Sep 2026 10:43:25 -0500 Subject: x86/amd_node: Fix PCI device reference counting in amd_smn_init() The local "root" pointer is a temporary variable used during the device search. Therefore, refcount related to the search iterators should be cleaned up after the search is complete. Use the __free() cleanup macro to ensure the refcount is decremented when the temporary pointer goes out of scope. Additionally, increment the refcount when caching a root pointer. This ensures the in-use refcount is separate from the temporary search refcounting. Finally, drop the redundant "root = NULL" before the second search loop. The pci_get_class() iterator always decrements the refcount of its "from" argument, so the first loop can only fall through with "root" already NULL. Fixes: 0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching") Closes: https://sashiko.dev/#/patchset/20260806160159.230453-1-jason.andryuk%40amd.com Reported-by: Sashiko Assisted-by: LLM Signed-off-by: Yazen Ghannam Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Mario Limonciello (AMD) Cc: Link: https://patch.msgid.link/20260903154325.74343-1-yazen.ghannam@amd.com --- include/trace/events/cgroup.h | 263 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 263 insertions(+) create mode 100644 include/trace/events/cgroup.h (limited to 'include/trace/events/cgroup.h') diff --git a/include/trace/events/cgroup.h b/include/trace/events/cgroup.h new file mode 100644 index 000000000..b736da063 --- /dev/null +++ b/include/trace/events/cgroup.h @@ -0,0 +1,263 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM cgroup + +#if !defined(_TRACE_CGROUP_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_CGROUP_H + +#include +#include + +DECLARE_EVENT_CLASS(cgroup_root, + + TP_PROTO(struct cgroup_root *root), + + TP_ARGS(root), + + TP_STRUCT__entry( + __field( int, root ) + __field( u32, ss_mask ) + __string( name, root->name ) + ), + + TP_fast_assign( + __entry->root = root->hierarchy_id; + __entry->ss_mask = root->subsys_mask; + __assign_str(name); + ), + + TP_printk("root=%d ss_mask=%#x name=%s", + __entry->root, __entry->ss_mask, __get_str(name)) +); + +DEFINE_EVENT(cgroup_root, cgroup_setup_root, + + TP_PROTO(struct cgroup_root *root), + + TP_ARGS(root) +); + +DEFINE_EVENT(cgroup_root, cgroup_destroy_root, + + TP_PROTO(struct cgroup_root *root), + + TP_ARGS(root) +); + +DEFINE_EVENT(cgroup_root, cgroup_remount, + + TP_PROTO(struct cgroup_root *root), + + TP_ARGS(root) +); + +DECLARE_EVENT_CLASS(cgroup, + + TP_PROTO(struct cgroup *cgrp, const char *path), + + TP_ARGS(cgrp, path), + + TP_STRUCT__entry( + __field( int, root ) + __field( int, level ) + __field( u64, id ) + __string( path, path ) + ), + + TP_fast_assign( + __entry->root = cgrp->root->hierarchy_id; + __entry->id = cgroup_id(cgrp); + __entry->level = cgrp->level; + __assign_str(path); + ), + + TP_printk("root=%d id=%llu level=%d path=%s", + __entry->root, __entry->id, __entry->level, __get_str(path)) +); + +DEFINE_EVENT(cgroup, cgroup_mkdir, + + TP_PROTO(struct cgroup *cgrp, const char *path), + + TP_ARGS(cgrp, path) +); + +DEFINE_EVENT(cgroup, cgroup_rmdir, + + TP_PROTO(struct cgroup *cgrp, const char *path), + + TP_ARGS(cgrp, path) +); + +DEFINE_EVENT(cgroup, cgroup_release, + + TP_PROTO(struct cgroup *cgrp, const char *path), + + TP_ARGS(cgrp, path) +); + +DEFINE_EVENT(cgroup, cgroup_rename, + + TP_PROTO(struct cgroup *cgrp, const char *path), + + TP_ARGS(cgrp, path) +); + +DEFINE_EVENT(cgroup, cgroup_freeze, + + TP_PROTO(struct cgroup *cgrp, const char *path), + + TP_ARGS(cgrp, path) +); + +DEFINE_EVENT(cgroup, cgroup_unfreeze, + + TP_PROTO(struct cgroup *cgrp, const char *path), + + TP_ARGS(cgrp, path) +); + +DECLARE_EVENT_CLASS(cgroup_migrate, + + TP_PROTO(struct cgroup *dst_cgrp, const char *path, + struct task_struct *task, bool threadgroup), + + TP_ARGS(dst_cgrp, path, task, threadgroup), + + TP_STRUCT__entry( + __field( int, dst_root ) + __field( int, dst_level ) + __field( u64, dst_id ) + __field( int, pid ) + __string( dst_path, path ) + __string( comm, task->comm ) + ), + + TP_fast_assign( + __entry->dst_root = dst_cgrp->root->hierarchy_id; + __entry->dst_id = cgroup_id(dst_cgrp); + __entry->dst_level = dst_cgrp->level; + __assign_str(dst_path); + __entry->pid = task->pid; + __assign_str(comm); + ), + + TP_printk("dst_root=%d dst_id=%llu dst_level=%d dst_path=%s pid=%d comm=%s", + __entry->dst_root, __entry->dst_id, __entry->dst_level, + __get_str(dst_path), __entry->pid, __get_str(comm)) +); + +DEFINE_EVENT(cgroup_migrate, cgroup_attach_task, + + TP_PROTO(struct cgroup *dst_cgrp, const char *path, + struct task_struct *task, bool threadgroup), + + TP_ARGS(dst_cgrp, path, task, threadgroup) +); + +DEFINE_EVENT(cgroup_migrate, cgroup_transfer_tasks, + + TP_PROTO(struct cgroup *dst_cgrp, const char *path, + struct task_struct *task, bool threadgroup), + + TP_ARGS(dst_cgrp, path, task, threadgroup) +); + +DECLARE_EVENT_CLASS(cgroup_event, + + TP_PROTO(struct cgroup *cgrp, const char *path, int val), + + TP_ARGS(cgrp, path, val), + + TP_STRUCT__entry( + __field( int, root ) + __field( int, level ) + __field( u64, id ) + __string( path, path ) + __field( int, val ) + ), + + TP_fast_assign( + __entry->root = cgrp->root->hierarchy_id; + __entry->id = cgroup_id(cgrp); + __entry->level = cgrp->level; + __assign_str(path); + __entry->val = val; + ), + + TP_printk("root=%d id=%llu level=%d path=%s val=%d", + __entry->root, __entry->id, __entry->level, __get_str(path), + __entry->val) +); + +DEFINE_EVENT(cgroup_event, cgroup_notify_populated, + + TP_PROTO(struct cgroup *cgrp, const char *path, int val), + + TP_ARGS(cgrp, path, val) +); + +DEFINE_EVENT(cgroup_event, cgroup_notify_frozen, + + TP_PROTO(struct cgroup *cgrp, const char *path, int val), + + TP_ARGS(cgrp, path, val) +); + +DECLARE_EVENT_CLASS(cgroup_rstat, + + TP_PROTO(struct cgroup *cgrp, int cpu, bool contended), + + TP_ARGS(cgrp, cpu, contended), + + TP_STRUCT__entry( + __field( int, root ) + __field( int, level ) + __field( u64, id ) + __field( int, cpu ) + __field( bool, contended ) + ), + + TP_fast_assign( + __entry->root = cgrp->root->hierarchy_id; + __entry->id = cgroup_id(cgrp); + __entry->level = cgrp->level; + __entry->cpu = cpu; + __entry->contended = contended; + ), + + TP_printk("root=%d id=%llu level=%d cpu=%d lock contended:%d", + __entry->root, __entry->id, __entry->level, + __entry->cpu, __entry->contended) +); + +/* + * Related to locks: + * global rstat_base_lock for base stats + * cgroup_subsys::rstat_ss_lock for subsystem stats + */ +DEFINE_EVENT(cgroup_rstat, cgroup_rstat_lock_contended, + + TP_PROTO(struct cgroup *cgrp, int cpu, bool contended), + + TP_ARGS(cgrp, cpu, contended) +); + +DEFINE_EVENT(cgroup_rstat, cgroup_rstat_locked, + + TP_PROTO(struct cgroup *cgrp, int cpu, bool contended), + + TP_ARGS(cgrp, cpu, contended) +); + +DEFINE_EVENT(cgroup_rstat, cgroup_rstat_unlock, + + TP_PROTO(struct cgroup *cgrp, int cpu, bool contended), + + TP_ARGS(cgrp, cpu, contended) +); + +#endif /* _TRACE_CGROUP_H */ + +/* This part must be outside protection */ +#include -- cgit v1.3.1