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 4F004CFA441 for ; Thu, 20 Nov 2025 21:25:13 +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=d/k3hFI0N3PlwrJyVpQxt9lqtw/kGAH3LEtJUbafSJU=; b=c1wYrtFNIPFvgxajwLNssKPIfy /Eri7YWDpsz8fcaWsMyTSTi+C3lq32BpIG9Fq1MdDpFGi2AFt2WUHfeJIr/SSxLSQ5Esp3Y5iIgnZ 4JbRIljp7yrUNPqGhXLGrKDnjZIo6lQPq+tRCb8NiqZaCyEkTkwPI1QAhWQ54lx8PATr4jWvtzERr 0uhw5YfAF+3Bwc0RBiAImM0/QND+1xa+f9HRYWtyWMY7uW1zmwfASNd/dbF4U8ziA4t0pyhePFh+9 llD4N9JGS0vlMpMaEbS/7CqBwJ5ARn1R44kP2VkKpI+LNar67YY/AncEmHxIt6qxkhc2zND+OHuEO XpZeqGiQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vMC9M-00000007Roq-1HCe; Thu, 20 Nov 2025 21:25:08 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vMC9K-00000007Rnx-1kUf for linux-arm-kernel@lists.infradead.org; Thu, 20 Nov 2025 21:25:06 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 6473C6016D; Thu, 20 Nov 2025 21:25:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10B4DC4CEF1; Thu, 20 Nov 2025 21:25:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763673905; bh=Xs4AEFpvDY6JzCUFXkOpJeETRBiY34vm/qu0XZbAVcM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tGU9vA0ucsFWp6B9XXnY7o7XV791mPu6UI5szkwx4hc5qI4Ar7mkhIRSUqfHcfWLw WnyL2dfOIy7ul01z8SglOlCdK0BGZRvpqJoU54BdFa0Q2PIPhuM1JR7EsvAI92A5av FxJkl5TpFwECRDlW1t8ARXeNNkjehxMCh2PeMj7P/dDSIKoztchSBJse5w2EN/ZLym j68/uoJcKgzVGhGO25iu2VlMeCZ7GpgNSCojS7IJO1eIhLIKtauyBFVJ4+g3qhh2D2 D36tKfXrrYv/bPlcVgn3C47WYTGeX0GrI5ngPKba7e5YnfftsvAMWNhbs93w8F452J neOuUbAWEmc5g== 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: [PATCHv3 bpf-next 5/8] ftrace: Add update_ftrace_direct_mod function Date: Thu, 20 Nov 2025 22:23:59 +0100 Message-ID: <20251120212402.466524-6-jolsa@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251120212402.466524-1-jolsa@kernel.org> References: <20251120212402.466524-1-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 | 68 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 74 insertions(+) diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index c571deeff840..4e2c0ed769fc 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -552,6 +552,7 @@ 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); @@ -589,6 +590,11 @@ 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 cc730a8fd087..5243aefb6096 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -6486,6 +6486,74 @@ 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_hash *orig_hash = ops->func_hash->filter_hash; + struct ftrace_func_entry *entry, *tmp; + static struct ftrace_ops tmp_ops = { + .func = ftrace_stub, + .flags = FTRACE_OPS_FL_STUB, + }; + unsigned long size, i; + int err; + + 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); + + /* 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 */ /** -- 2.51.1