From patchwork Tue Feb 7 18:21:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florent Revest X-Patchwork-Id: 13131981 X-Patchwork-Delegate: bpf@iogearbox.net 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 63541C64EC4 for ; Tue, 7 Feb 2023 18:22:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232377AbjBGSW4 (ORCPT ); Tue, 7 Feb 2023 13:22:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42174 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230391AbjBGSWj (ORCPT ); Tue, 7 Feb 2023 13:22:39 -0500 Received: from mail-wm1-x330.google.com (mail-wm1-x330.google.com [IPv6:2a00:1450:4864:20::330]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 054063FF39 for ; Tue, 7 Feb 2023 10:22:08 -0800 (PST) Received: by mail-wm1-x330.google.com with SMTP id l37-20020a05600c1d2500b003dfe46a9801so10694239wms.0 for ; Tue, 07 Feb 2023 10:22:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=J5NwLdTe9+0vZLgVBry/0OWW8ooKZkaJGOHBRX4ufN8=; b=fRASL2UGIcRNBlf/7ae//8RHK3T5XjSoyr3hRCQQ/pNn5tg2MlxAaLTHUyrgXCZpKU AHPIQD8hI/OFXApHVT6ZRDjG9/QWKH7JrARdfDNLfSpOI8BsnkXlG47EYE5JYOHPQGyJ x4yiblaJF2UM7yX6fO6T+866rFk5FSIG2vfvw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=J5NwLdTe9+0vZLgVBry/0OWW8ooKZkaJGOHBRX4ufN8=; b=NqI/W/Ub7rjQozwzwRKA+rmxserhZp0earXwj8NeX54xbI5zFs57gqYfVMfviI1+JL 02rwUrGyZiLDd8dcoxjusNQ+oXt2PzE7ZfMQK9fk2yRakL2803uE5k+NnpT918uA6kTI 0UWesiNMa8/JIvwCnFoZWtUlAQbY0vtlQT7occnt2kZvWNJvyscHB8YHK2cvFMkRuvCr csueR5tEy3px5m/7fzSzx7/r4i5xswObmtAtOq++oeD7oUQwrduMI3mrYoZL/hH4XSYA G8n5ubWYTCe/qA14KxG4ozCAV5bnk6s0jkaE5JfZgfrdeYh1CaGxP8CyGGrgfRtJI2hM 3y6Q== X-Gm-Message-State: AO0yUKV8XeXhGzR83SWKLBk4ymU+l/OH+UCVKtQba267Zs9Afk5wjb0k xBGVMiSGeh4n3U4TqKni/FuhAQ== X-Google-Smtp-Source: AK7set+wZC1fFBJBT4Cz/9WP5hkX0pcI5J1C2FNWlCc4Z6sReHQy8htf+UrUwjq3Yg4xjlzO15lQnQ== X-Received: by 2002:a05:600c:30ca:b0:3df:c284:7e78 with SMTP id h10-20020a05600c30ca00b003dfc2847e78mr4149127wmn.38.1675794126436; Tue, 07 Feb 2023 10:22:06 -0800 (PST) Received: from revest.zrh.corp.google.com ([2a00:79e0:9d:6:5307:c0c0:ff97:80de]) by smtp.gmail.com with ESMTPSA id n6-20020a05600c4f8600b003daf672a616sm15578369wmq.22.2023.02.07.10.22.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Feb 2023 10:22:06 -0800 (PST) From: Florent Revest To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org Cc: catalin.marinas@arm.com, will@kernel.org, rostedt@goodmis.org, mhiramat@kernel.org, mark.rutland@arm.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kpsingh@kernel.org, jolsa@kernel.org, xukuohai@huaweicloud.com, lihuafei1@huawei.com, Florent Revest Subject: [PATCH v2 04/10] ftrace: Store direct called addresses in their ops Date: Tue, 7 Feb 2023 19:21:29 +0100 Message-Id: <20230207182135.2671106-5-revest@chromium.org> X-Mailer: git-send-email 2.39.1.519.gcb327c4b5f-goog In-Reply-To: <20230207182135.2671106-1-revest@chromium.org> References: <20230207182135.2671106-1-revest@chromium.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org All direct calls are now registered using the register_ftrace_direct API so each ops can jump to only one direct-called trampoline. By storing the direct called trampoline address directly in the ops we can save one hashmap lookup in the direct call ops and implement arm64 direct calls on top of call ops. Signed-off-by: Florent Revest --- include/linux/ftrace.h | 3 +++ kernel/trace/ftrace.c | 6 ++++-- 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h index a7dbd307c3a4..84f717f8959e 100644 --- a/include/linux/ftrace.h +++ b/include/linux/ftrace.h @@ -321,6 +321,9 @@ struct ftrace_ops { unsigned long trampoline_size; struct list_head list; ftrace_ops_func_t ops_func; +#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS + unsigned long direct_call; +#endif #endif }; diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index cb77a0a208c7..dfa5f34ec320 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2577,9 +2577,8 @@ ftrace_add_rec_direct(unsigned long ip, unsigned long addr, static void call_direct_funcs(unsigned long ip, unsigned long pip, struct ftrace_ops *ops, struct ftrace_regs *fregs) { - unsigned long addr; + unsigned long addr = ops->direct_call; - addr = ftrace_find_rec_direct(ip); if (!addr) return; @@ -5375,6 +5374,7 @@ int register_ftrace_direct(struct ftrace_ops *ops, unsigned long addr) ops->func = call_direct_funcs; ops->flags = MULTI_FLAGS; ops->trampoline = FTRACE_REGS_ADDR; + ops->direct_call = addr; err = register_ftrace_function_nolock(ops); @@ -5445,6 +5445,7 @@ __modify_ftrace_direct(struct ftrace_ops *ops, unsigned long addr) /* 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; + tmp_ops.direct_call = addr; err = register_ftrace_function_nolock(&tmp_ops); if (err) @@ -5466,6 +5467,7 @@ __modify_ftrace_direct(struct ftrace_ops *ops, unsigned long addr) entry->direct = addr; } } + WRITE_ONCE(ops->direct_call, addr); mutex_unlock(&ftrace_lock);