From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9B6C9EE0205 for ; Tue, 30 Dec 2025 14:51:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=n859BdEuwKS+6j4Y/EGhHOIlP+eLomPbIsCkep9GDto=; b=ATs/yHpq1gqbcjD9ZQ8WWF+za7 +KOHy/l4hTGSEYMNS2eQLVN5zrnon+WkJ8SxEjtfAYwlYG6x5vV/d0Ny/9EMLoV3861doJX6WUmyN S+UcKc9k5CMIvh361H4ysvjPn5ug2ApxYAhO85Xv4k+5w1fA/DbTeaLtlyZcpkmLSKzmiE/UgheH+ l/AKC5L9IfacDw4ppZtGW+SOGnbYmbdhEyPhAlaeNtBssIBEy3WRmonPTFujgfTBnTzJS9c2psN9c jhan7GY6cIOWRKHnyqRw990ii4plsgHazHEZtniNNHuONLWthwc3+qLbFtwLUJ6kjMtnKh6Fb0qBe wyQddh5A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vab4R-00000004xVW-2ZVy; Tue, 30 Dec 2025 14:51:35 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vab4P-00000004xUC-457Q for linux-arm-kernel@lists.infradead.org; Tue, 30 Dec 2025 14:51:35 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 9778740C36; Tue, 30 Dec 2025 14:51:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C56CC4CEFB; Tue, 30 Dec 2025 14:51:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767106293; bh=Uw3/OEC2/SCHoYg3eLb7b4j+KpXYYCXkh5XjmDruH2k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MUBp280VlhNgP5lkeFCtjKh3/nBgd1UN6zEcv9UtsAyQoBiBZit37hL2uPUKWVTk2 gm0g0y2KgCN2+qhFrljdqPjbwFWeM38YArWqGDp62nF6trFM+dA2KnFz4mCEK1wk6G d/rfkMfEupPzhZYqgfX1qjqde+doOIsIfTWOry5Ag3fTssZnzMcylhr/51bmUzNleg GEKNJPXDcZ8GMOtscAfGB/Tr/04xZwkr1R3vCfy5w5YZSNzUG7BH6P4X9w1Vf4x6p4 vUBnpgdUDaN9MiczabpOtNUPuztA1FNWfgvfWvGGqfVIuXMCL6DkC/aBRACV13lkVk ttnT2yIbTWIhw== From: Jiri Olsa To: Steven Rostedt , Florent Revest , Mark Rutland Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Menglong Dong , Song Liu Subject: [PATCHv6 bpf-next 7/9] bpf: Add trampoline ip hash table Date: Tue, 30 Dec 2025 15:50:08 +0100 Message-ID: <20251230145010.103439-8-jolsa@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251230145010.103439-1-jolsa@kernel.org> References: <20251230145010.103439-1-jolsa@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251230_065134_048300_B705A389 X-CRM114-Status: GOOD ( 15.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Following changes need to lookup trampoline based on its ip address, adding hash table for that. Signed-off-by: Jiri Olsa --- include/linux/bpf.h | 7 +++++-- kernel/bpf/trampoline.c | 30 +++++++++++++++++++----------- 2 files changed, 24 insertions(+), 13 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 4e7d72dfbcd4..c85677aae865 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1325,14 +1325,17 @@ struct bpf_tramp_image { }; struct bpf_trampoline { - /* hlist for trampoline_table */ - struct hlist_node hlist; + /* hlist for trampoline_key_table */ + struct hlist_node hlist_key; + /* hlist for trampoline_ip_table */ + struct hlist_node hlist_ip; struct ftrace_ops *fops; /* serializes access to fields of this trampoline */ struct mutex mutex; refcount_t refcnt; u32 flags; u64 key; + unsigned long ip; struct { struct btf_func_model model; void *addr; diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c index 789ff4e1f40b..bdac9d673776 100644 --- a/kernel/bpf/trampoline.c +++ b/kernel/bpf/trampoline.c @@ -24,9 +24,10 @@ const struct bpf_prog_ops bpf_extension_prog_ops = { #define TRAMPOLINE_HASH_BITS 10 #define TRAMPOLINE_TABLE_SIZE (1 << TRAMPOLINE_HASH_BITS) -static struct hlist_head trampoline_table[TRAMPOLINE_TABLE_SIZE]; +static struct hlist_head trampoline_key_table[TRAMPOLINE_TABLE_SIZE]; +static struct hlist_head trampoline_ip_table[TRAMPOLINE_TABLE_SIZE]; -/* serializes access to trampoline_table */ +/* serializes access to trampoline tables */ static DEFINE_MUTEX(trampoline_mutex); #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS @@ -135,15 +136,15 @@ void bpf_image_ksym_del(struct bpf_ksym *ksym) PAGE_SIZE, true, ksym->name); } -static struct bpf_trampoline *bpf_trampoline_lookup(u64 key) +static struct bpf_trampoline *bpf_trampoline_lookup(u64 key, unsigned long ip) { struct bpf_trampoline *tr; struct hlist_head *head; int i; mutex_lock(&trampoline_mutex); - head = &trampoline_table[hash_64(key, TRAMPOLINE_HASH_BITS)]; - hlist_for_each_entry(tr, head, hlist) { + head = &trampoline_key_table[hash_64(key, TRAMPOLINE_HASH_BITS)]; + hlist_for_each_entry(tr, head, hlist_key) { if (tr->key == key) { refcount_inc(&tr->refcnt); goto out; @@ -164,8 +165,12 @@ static struct bpf_trampoline *bpf_trampoline_lookup(u64 key) #endif tr->key = key; - INIT_HLIST_NODE(&tr->hlist); - hlist_add_head(&tr->hlist, head); + tr->ip = ftrace_location(ip); + INIT_HLIST_NODE(&tr->hlist_key); + INIT_HLIST_NODE(&tr->hlist_ip); + hlist_add_head(&tr->hlist_key, head); + head = &trampoline_ip_table[hash_64(tr->ip, TRAMPOLINE_HASH_BITS)]; + hlist_add_head(&tr->hlist_ip, head); refcount_set(&tr->refcnt, 1); mutex_init(&tr->mutex); for (i = 0; i < BPF_TRAMP_MAX; i++) @@ -846,7 +851,7 @@ void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog) prog->aux->attach_btf_id); bpf_lsm_find_cgroup_shim(prog, &bpf_func); - tr = bpf_trampoline_lookup(key); + tr = bpf_trampoline_lookup(key, 0); if (WARN_ON_ONCE(!tr)) return; @@ -866,7 +871,7 @@ struct bpf_trampoline *bpf_trampoline_get(u64 key, { struct bpf_trampoline *tr; - tr = bpf_trampoline_lookup(key); + tr = bpf_trampoline_lookup(key, tgt_info->tgt_addr); if (!tr) return NULL; @@ -902,7 +907,8 @@ void bpf_trampoline_put(struct bpf_trampoline *tr) * fexit progs. The fentry-only trampoline will be freed via * multiple rcu callbacks. */ - hlist_del(&tr->hlist); + hlist_del(&tr->hlist_key); + hlist_del(&tr->hlist_ip); if (tr->fops) { ftrace_free_filter(tr->fops); kfree(tr->fops); @@ -1175,7 +1181,9 @@ static int __init init_trampolines(void) int i; for (i = 0; i < TRAMPOLINE_TABLE_SIZE; i++) - INIT_HLIST_HEAD(&trampoline_table[i]); + INIT_HLIST_HEAD(&trampoline_key_table[i]); + for (i = 0; i < TRAMPOLINE_TABLE_SIZE; i++) + INIT_HLIST_HEAD(&trampoline_ip_table[i]); return 0; } late_initcall(init_trampolines); -- 2.52.0