From patchwork Thu Mar 20 08:20:56 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Pan-Doh X-Patchwork-Id: 14023511 X-Patchwork-Delegate: bhelgaas@google.com Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 37C662147F2 for ; Thu, 20 Mar 2025 08:21:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742458884; cv=none; b=rWEjG4t/mDrHqtIUbL/mYCAIcvdkHVEOu0iBVLVLM/Z0B/GZ4rBeJP98O1MZ0O7xTroxLbHVq9gXe2pd2b9Ar24++/p0hA1S5dWrQBUZD7Px2XnpHDIfgAI1d7VkZ58z41B6KJn1TsMf84gEEQA+Z6hfGhGm2enGjdCFtWAu5do= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742458884; c=relaxed/simple; bh=yoUiQSYGpSGekAoG2O4E8f17ta3m6ARia8UOtVAr6JI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=qyEdpxyLnWwQIgaNEAbMSBqb6wfeOzmS69jO/yHb4RwKncIWhjew8ZW47zVC2H70jIOz3p9Hd0wPI4ggskCFlpL9TdxZdU5zrsTb8+GMMVUca2Lb2QqcZkNjvov1w3Hww46Ur5CVfyhQ3NGsCXFhecvgWjt1Syu0+8IMFGmL+ys= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--pandoh.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=JhTBIPc3; arc=none smtp.client-ip=209.85.216.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--pandoh.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="JhTBIPc3" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-2ff581215f7so691273a91.3 for ; Thu, 20 Mar 2025 01:21:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1742458882; x=1743063682; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=Pqyah9gjao8rMiwTqNmziiGpp43wpvz0+2z6DdoovpM=; b=JhTBIPc32I8Fq9FxNPo17w+h285Fc+VTGbAcq9S/o8LXGvoTqbTxwm0TsOEGJeJNq7 Obe6c3Mo/eIidk7Qrt8ggHDbZPHKrMZxni+8+8fdnlZ+FYzM37UR0QlDNtOkomV+Edhq zHF+wCdi8Yx3kYT43D0lDO++GsSSAWUH5YHMQnWNGljds6lof9VUfGNpuy54m6Gcijtr CHQXEYWhT7o1NF4lKC/3wL+oMptvtPv7Vn1oCDz+cdCNq0bqcKEmIau3IGetH9LXU/F0 NRi1glNIZNrko/q+OfBq0MrH4WmZI/YIev+sxXb+LPfw3F7DmscfmwvAgz8vJaYwIhl2 8vlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1742458882; x=1743063682; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=Pqyah9gjao8rMiwTqNmziiGpp43wpvz0+2z6DdoovpM=; b=A+FEsJPVVGPI1kc5/NAlM5SA7vk94ugdyQ5dZ10/x3lw+fRxCrck+WPIGTk75cv9+D /rSfLHxpZzxxh4h+QUSIfg7NJ3eDW+OZPrlCSd39UPC6XNBs07Mc0OtAXx/kKAUEnyFp efF2cMHAWb2pSCNBz3kC+bUp4pNkMqqZr8ZEP1zvL3BP8ShM9NQxhuV2Rwy3xm4toNGd 49jYc44F9LM4+sBBDvtQ/TsMWrD+oPAd+r+sC6HfmuQlGjyYtQrZkbKIHO0IOFRq3M4U 2LbMan9CNHvpK22LokN8toB31hWAXI6zz49z8cPNJ5trJNuVzhK8yi5JB701QtQM+Tc1 cB5Q== X-Gm-Message-State: AOJu0Yzz/MAiNzTmoRwD0NynF/kP1XSgrNmmQrgNSz82GLuhK8rWUPxr wfec/PU1YjaKLS/XKAD29irTCFnz3aB/Ki+0K83UczddMY8NB4Fy4Q56Wwc/HzN2ATnowr+OPb7 jmg== X-Google-Smtp-Source: AGHT+IH/o1u1mFbEa/B+GyrhmD3YYeil4k1yDaWCytnQgmgCp6TV83vyISw4wc+d5IAipkFRli4zitaJNwM= X-Received: from pjbli18.prod.google.com ([2002:a17:90b:48d2:b0:2ff:6e58:89f7]) (user=pandoh job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90a:e7c4:b0:2ff:5ed8:83d0 with SMTP id 98e67ed59e1d1-301d52c0657mr3852034a91.16.1742458882425; Thu, 20 Mar 2025 01:21:22 -0700 (PDT) Date: Thu, 20 Mar 2025 01:20:56 -0700 In-Reply-To: <20250320082057.622983-1-pandoh@google.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250320082057.622983-1-pandoh@google.com> X-Mailer: git-send-email 2.49.0.rc1.451.g8f38331e32-goog Message-ID: <20250320082057.622983-7-pandoh@google.com> Subject: [PATCH v4 6/7] PCI/AER: Add ratelimits to PCI AER Documentation From: Jon Pan-Doh To: Bjorn Helgaas , Karolina Stolarek Cc: linux-pci@vger.kernel.org, Martin Petersen , Ben Fuller , Drew Walton , Anil Agrawal , Tony Luck , " =?utf-8?q?Ilpo_J=C3=A4rvinen?= " , Sathyanarayanan Kuppuswamy , Lukas Wunner , Jonathan Cameron , Terry Bowman , Jon Pan-Doh Add ratelimits section for rationale and defaults. Signed-off-by: Karolina Stolarek Signed-off-by: Jon Pan-Doh Reviewed-by: Kuppuswamy Sathyanarayanan --- Documentation/PCI/pcieaer-howto.rst | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/PCI/pcieaer-howto.rst b/Documentation/PCI/pcieaer-howto.rst index f013f3b27c82..896d2a232a90 100644 --- a/Documentation/PCI/pcieaer-howto.rst +++ b/Documentation/PCI/pcieaer-howto.rst @@ -85,6 +85,17 @@ In the example, 'Requester ID' means the ID of the device that sent the error message to the Root Port. Please refer to PCIe specs for other fields. +AER Ratelimits +-------------- + +Since error messages can be generated for each transaction, we may see +large volumes of errors reported. To prevent spammy devices from flooding +the console/stalling execution, messages are throttled by device and error +type (correctable vs. uncorrectable). + +AER uses the default ratelimit of DEFAULT_RATELIMIT_BURST (10 events) over +DEFAULT_RATELIMIT_INTERVAL (5 seconds). + AER Statistics / Counters -------------------------