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 8384AD5B86D for ; Mon, 15 Dec 2025 21:15:54 +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=28n1amLV60Xl1tRQrkwP/i7pGJXQ241age168E9CdcQ=; b=JqfZgEd0IdgiZwlYv7gOg17jEJ DEoHWqeWAfnyRufxMQi7MUlGGSs3gjM/1KBIUja23HdA89EPL5I2PsZ5Ncw8LFglAk5G498EgU7EO FOPd5XBvodw/4V4tT58wXvGP79dNVAENKp+NKVHjHxvdgRGB/GXCVwRW6TnHiNi+bsNP9fP6KsT9C Gaibcnrxym0KoiyY1t+wwicfwzp5Pem+PoP/+BZf5bMQjlGcsv30VOtAiLyzAEXgGRHAvCRu6gYAR HanOzDuaUUutrrDF+yfCj/Dgi48SqKMPusmqWFoNAUCYVSfljqucYdejid8pcoLGOQ4k4u9D05nvw Ojjq78Mw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vVFv4-00000004GcX-3qWm; Mon, 15 Dec 2025 21:15:50 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vVFv3-00000004GbO-2G7T for linux-arm-kernel@lists.infradead.org; Mon, 15 Dec 2025 21:15:49 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id EC8DF60183; Mon, 15 Dec 2025 21:15:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84B31C16AAE; Mon, 15 Dec 2025 21:15:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1765833318; bh=p6gqLffg23UILKDsdjUK8VuxMZVSEGZ26VdVvM6E4Fc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Af6OpNzq71MMfPjqgppB3DbyU1JFHnVbLu7u99k3Fr1SdUKtHcDJGXmpxRn40xMiQ pjuHBGySCVEXLLBXBL4iFFCHeryRxDJmIhfF+5w6edhWhhiWZZnPr4zIz//MCBAyVN j3DMzV3tdMqUij5mAbwo5nDW6G6KmYkCgaftGzyM8noRwKpcgZGK0D95geAg6pqCBa DnwxfsQTy8vctJwstW3F3wTXq22AdwtiCC04luxMnsSgoE9P/viKWRxys/Y6AiClOw 9q/rLqt1SGc0hLYDx0oVdOWPx+mklPwZCYfwZzpVLcOQL5Ld8vVtA5KS1rVVEQvCd3 65RC8yoyu5s+g== 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: [PATCHv5 bpf-next 6/9] ftrace: Add update_ftrace_direct_mod function Date: Mon, 15 Dec 2025 22:13:59 +0100 Message-ID: <20251215211402.353056-7-jolsa@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251215211402.353056-1-jolsa@kernel.org> References: <20251215211402.353056-1-jolsa@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 Adding update_ftrace_direct_mod function that modifies all entries (ip -> direct) provided in hash argument to direct ftrace ops and updates its attachments. The difference to current modify_ftrace_direct is: - hash argument that allows to modify multiple ip -> direct entries at once This change will allow us to have simple ftrace_ops for all bpf direct interface users in following changes. Signed-off-by: Jiri Olsa --- include/linux/ftrace.h | 6 ++++ kernel/trace/ftrace.c | 72 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 78 insertions(+) diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index ac4b473c7fd3..c3bf9cede1fe 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -545,6 +545,7 @@ int modify_ftrace_direct_nolock(struct ftrace_ops *ops, unsigned long addr); int update_ftrace_direct_add(struct ftrace_ops *ops, struct ftrace_hash *hash); int update_ftrace_direct_del(struct ftrace_ops *ops, struct ftrace_hash *hash); +int update_ftrace_direct_mod(struct ftrace_ops *ops, struct ftrace_hash *hash, bool do_direct_lock); void ftrace_stub_direct_tramp(void); @@ -582,6 +583,11 @@ static inline int update_ftrace_direct_del(struct ftrace_ops *ops, struct ftrace return -ENODEV; } +static inline int update_ftrace_direct_mod(struct ftrace_ops *ops, struct ftrace_hash *hash, bool do_direct_lock) +{ + return -ENODEV; +} + /* * This must be implemented by the architecture. * It is the way the ftrace direct_ops helper, when called diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 48dc0de5f2ce..95a38fb18ed7 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -6489,6 +6489,78 @@ int update_ftrace_direct_del(struct ftrace_ops *ops, struct ftrace_hash *hash) return err; } +int update_ftrace_direct_mod(struct ftrace_ops *ops, struct ftrace_hash *hash, bool do_direct_lock) +{ + struct ftrace_func_entry *entry, *tmp; + static struct ftrace_ops tmp_ops = { + .func = ftrace_stub, + .flags = FTRACE_OPS_FL_STUB, + }; + struct ftrace_hash *orig_hash; + unsigned long size, i; + int err = -EINVAL; + + if (!hash_count(hash)) + return -EINVAL; + if (check_direct_multi(ops)) + return -EINVAL; + if (!(ops->flags & FTRACE_OPS_FL_ENABLED)) + return -EINVAL; + if (direct_functions == EMPTY_HASH) + return -EINVAL; + + if (do_direct_lock) + mutex_lock(&direct_mutex); + + orig_hash = ops->func_hash ? ops->func_hash->filter_hash : NULL; + if (!orig_hash) + goto unlock; + + /* Enable the tmp_ops to have the same functions as the direct ops */ + ftrace_ops_init(&tmp_ops); + tmp_ops.func_hash = ops->func_hash; + + err = register_ftrace_function_nolock(&tmp_ops); + if (err) + goto unlock; + + /* + * Call __ftrace_hash_update_ipmodify() here, so that we can call + * ops->ops_func for the ops. This is needed because the above + * register_ftrace_function_nolock() worked on tmp_ops. + */ + err = __ftrace_hash_update_ipmodify(ops, orig_hash, orig_hash, true); + if (err) + goto out; + + /* + * Now the ftrace_ops_list_func() is called to do the direct callers. + * We can safely change the direct functions attached to each entry. + */ + mutex_lock(&ftrace_lock); + + size = 1 << hash->size_bits; + for (i = 0; i < size; i++) { + hlist_for_each_entry(entry, &hash->buckets[i], hlist) { + tmp = __ftrace_lookup_ip(direct_functions, entry->ip); + if (!tmp) + continue; + tmp->direct = entry->direct; + } + } + + mutex_unlock(&ftrace_lock); + +out: + /* Removing the tmp_ops will add the updated direct callers to the functions */ + unregister_ftrace_function(&tmp_ops); + +unlock: + if (do_direct_lock) + mutex_unlock(&direct_mutex); + return err; +} + #endif /* CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS */ /** -- 2.52.0