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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 766A1C433F5 for ; Tue, 1 Mar 2022 16:46:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236204AbiCAQrd (ORCPT ); Tue, 1 Mar 2022 11:47:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52370 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233634AbiCAQrb (ORCPT ); Tue, 1 Mar 2022 11:47:31 -0500 Received: from mail-io1-xd35.google.com (mail-io1-xd35.google.com [IPv6:2607:f8b0:4864:20::d35]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E7776DF90 for ; Tue, 1 Mar 2022 08:46:49 -0800 (PST) Received: by mail-io1-xd35.google.com with SMTP id h16so19061568iol.11 for ; Tue, 01 Mar 2022 08:46:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=I1DKkFkTD51crlgMGLdpYJpND0N6pwdsFJPVoE5cl6o=; b=jEPhltpGhYcqAq57XkAAn66Kov5OWMOzOGhPUapIU2W5R+8LDIKiQXjhzEK561SyQo 6N+iLEMORuUO2QCZ/IA6jXaXN+R39vV/86n08B/6hwSkRM7Q3xFgIL56RbEZ8RT4NRcs 4bPPlOQkCX9qDbVvKpfbtb5FaD0ef8AEeLLn9Aocksq7fKVAKk8VVFLeYzAWK77llleb 9kW2am6M5Fd4C37wTrEXDi7wd2MwGNXaEQ6BT5FQrIRqtkjaWAm09bIGIKGnU2Pp7u9K iE+zqate6yY9iBSW2Lock8xbkvA3vojZ+Br9HhzRxdDiP2FU5uZj81qf5tN4G1Jh4E1G 53Jw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=I1DKkFkTD51crlgMGLdpYJpND0N6pwdsFJPVoE5cl6o=; b=gJo+KdgmWZVIScx888+XaIME44H8mWtn9unNrpgMzbuugGv2ahaACGttbc7DHmyUhz j1w1kqiVQ3EfSdkUVJPFqHA3P2+8t4PJYGYPiBAuSSbasjB4bLEjj8jHHQyX+XAxa2ri V+uw6MSU3xqiyCjGu/XcNMzUqAaVV64k6NzoPsbLpDpnXrVJAG1gyFlw3hi7mvXOzIgE hVH8fWckR03WtQ8F5nMAFf9EdTx87ZnMmvHtvFF4gR/I3y2iMzzmZnsO2nMLMKwFF6V4 vGrx9+nV9IwC/SnEpxeSvwrzjg0FkcNtpIR64zweVK6CTu42GLXxEUOwSv+eqoIpBhQu vINA== X-Gm-Message-State: AOAM533lawMj1zReK6REdJIDKayffiBGPHMoPbb82Zk4JAeVqsAX/6j+ l0IjGzhvOk3ETUvZV8jPmdA= X-Google-Smtp-Source: ABdhPJwc3IPrO6b8RuyjrC3bbWDPNt8/BFUm757dn432bTjFTSza1QlncnWOpq0GGb7foTgAqGxYRw== X-Received: by 2002:a05:6638:204d:b0:314:a290:48c with SMTP id t13-20020a056638204d00b00314a290048cmr22222271jaj.264.1646153209259; Tue, 01 Mar 2022 08:46:49 -0800 (PST) Received: from frodo.hsd1.co.comcast.net ([2601:284:8204:2010::f10e]) by smtp.googlemail.com with ESMTPSA id o3-20020a6b5a03000000b00640a33c5b0dsm7272411iob.17.2022.03.01.08.46.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 01 Mar 2022 08:46:48 -0800 (PST) From: Jim Cromie To: jbaron@akamai.com, gregkh@linuxfoundation.org, daniel.vetter@ffwll.ch, seanpaul@chromium.org, robdclark@gmail.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org Cc: Jim Cromie Subject: [PATCH 00/12] use dynamic-debug under drm.debug api Date: Tue, 1 Mar 2022 09:46:16 -0700 Message-Id: <20220301164629.3814634-1-jim.cromie@gmail.com> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org hi Jason, Greg, Daniel, DRM-everyone drm.debug api provides ~23 macros to issue 10 categories of debug messages, each enabled by a bit in /sys/module/drm/parameters/debug. drm_debug_enabled(category) tests these bits at runtime; while cheap individually, the costs accumulate. Daniel, I think this revision addresses most of your early review, a lot has changed since. Heres the link: https://patchwork.freedesktop.org/patch/443989/ For CONFIG_DRM_USE_DYNAMIC_DEBUG=y, this patchset obsoletes those runtime tests (inside drm_*dbg) by wrapping the 2 fns in one of the dynamic_func_call* Factory macros. The config dependence is due to the .data footprint cost of the tables; AMDGPU has ~4k callsites, at 56 bytes each. This patchset creates entries in /proc/dynamic_debug/control for each callsite, and each has .class_id = macros' category. Those entries, and a new query keyword, allow (1st): # 1=DRM_UT_KMS (iirc) #> echo "module drm class 1 +p > /proc/dynamic_debug/control Then equivalently: # except it also clears other flags #> echo 0x01 > /sys/module/drm/parameters/debug series overview: dyndbg: - fix a bug in dyndbg static_key toggling, @stable cc'd - adds support for distinct classes to dyndbg (new,unused feature) - add DECLARE_DYNAMIC_DEBUG_CLASSBITS macro and callbacks to implement bitmap -> classid sysfs knob dyndbg: - drops exported fn: dynamic_debug_exec_queries() any potential users would just use macro, or a tweak on it. - improve info-msg to print both "old -> new" flags drm: - adapts drm debug category to dyndbg.class_id - wraps drm_*dbg() in a dyndbg Factory macro to get NOOP optimized debugs this disconnects drm.debug sysfs knob - uses DECLARE_DYNAMIC_DEBUG_CLASSBITS macro this reconnects sysfs knob This could be -v12, but the focus and subject has wandered a bit, and patchwork CI had multiple different notions of the version. Noteworthy changes: - no tracefs stuff here, refocus In contrast, the previous drm.debug approach: - replaced drm_dbg & drm_devdbg with calls to pr_debug & dev_dbg this preserved the optional decorations: module:function:line: - used DRM_UT_CORE => "drm:core:" prefix-string, cpp cat'd to formats this made sites selectable by matching to that format prefix This version: - .class_id is easier to explain, and no config/format-string diffs - wraps drm_dbg & drm_devdbg callsites for jumplabel enablement efficiency was original goal. - loses the optional decorations. drm has its own logmsg standards, doesn't need decorations slapped on later: could recast flags for drm specific decorations This is based on 5.17-rc4, for no particular reason. Its also here: in (dd-drm branch) ghlinux-ro https://github.com/jimc/linux.git (fetch) Jim Cromie (13): dyndbg: fix static_branch manipulation @stable dyndbg: add class_id field and query support dyndbg: add DEFINE_DYNAMIC_DEBUG_CLASSBITS macro and callbacks dyndbg: drop EXPORTed dynamic_debug_exec_queries dyndbg: improve change-info to have old and new dyndbg: abstract dyndbg_site_is_printing drm_print: condense enum drm_debug_category drm_print: interpose drm_*dbg with forwarding macros drm_print: wrap drm_*_dbg in dyndbg jumplabel drm_print: refine drm_debug_enabled for dyndbg+jump-label drm_print: prefer bare printk KERN_DEBUG on generic fn drm_print: add _ddebug desc to drm_*dbg prototypes drm_print: use DEFINE_DYNAMIC_DEBUG_CLASSBITS for drm.debug .../admin-guide/dynamic-debug-howto.rst | 7 + drivers/gpu/drm/Kconfig | 12 ++ drivers/gpu/drm/Makefile | 2 + drivers/gpu/drm/drm_print.c | 56 ++++--- include/drm/drm_print.h | 80 +++++++--- include/linux/dynamic_debug.h | 113 +++++++++++--- lib/dynamic_debug.c | 140 ++++++++++++++---- 7 files changed, 323 insertions(+), 87 deletions(-) -- 2.35.1