From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-m15588.qiye.163.com (mail-m15588.qiye.163.com [101.71.155.88]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5DEDE35C6AB for ; Wed, 9 Sep 2026 05:30:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=101.71.155.88 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788931858; cv=none; b=SG/xspXewwiNQb6bEnaqIwhBvG80uMf0SmD4znTlby8v4+v9r/DQDruIACaS+WXg2Z+rWZYEZ73hnEPBv9gNFAZRymae7UvqRmjls3KYo+hSxrgz4yqNa2BW0de2SG/taj7YHiBi5ZTxAb4LhEECKOWLGg0RMT8kQPZlLHwGr1M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788931858; c=relaxed/simple; bh=0uEessHzcSfxsC9/R4E/G5cHhOHZfHSBc4M8wjJU3EI=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=WAlfSwl71a5uYdQYaqngkd2yAy68DCCFPdfFpI8f6HaJ70D2E41O2w7UeSxIgpDiMLC2qSS9x4vnd1kQ7cLxKjaKCnU0adPIMKC5ZuRYP4ZJHXiYykcDfv3n/EtrkZEeFMJGReQ+3mrANbuu7jTYDDT6NcK+rpRarNxNACrJrWM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=hj-micro.com; spf=pass smtp.mailfrom=hj-micro.com; dkim=pass (1024-bit key) header.d=hj-micro.com header.i=@hj-micro.com header.b=a8vY9GZL; arc=none smtp.client-ip=101.71.155.88 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=hj-micro.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=hj-micro.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hj-micro.com header.i=@hj-micro.com header.b="a8vY9GZL" Received: from [127.0.0.1] (unknown [122.224.241.34]) by smtp.qiye.163.com (Hmail) with ESMTP id 4d0ba6a2f; Wed, 9 Sep 2026 10:01:22 +0800 (GMT+08:00) Message-ID: Date: Wed, 9 Sep 2026 10:01:22 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] perf/arm-cmn: Fix {wp_dev_sel2, wp_dev_sel} limited to 0/1 when MXP_MULTIPLE_DTM_EN is TRUE To: Robin Murphy , will@kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, mark.rutland@arm.com, peter.du@hj-micro.com, andy.xu@hj-micro.com, allen.wang@hj-micro.com References: <20260819105443.668784-1-allen.wang@hj-micro.com> <58adffd2-6ef4-4a4c-ba3a-3f510522d928@arm.com> Content-Language: en-US From: "allen.wang" In-Reply-To: <58adffd2-6ef4-4a4c-ba3a-3f510522d928@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-HM-Tid: 0aa083e5fbc009d8kunme32fd7ee3c8753 X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFITzdXWRgWCB1ZQUpXWS1ZQUlXWQ8JGhUIEh9ZQVlDThoeVkofQxgYSUJPTh5NHlYVFA kWGhdVEwETFhoSFyQUDg9ZV1kYEgtZQVlKSUlVSUlPVUlPSlVIT1lXWRYaDxIVHRRZQVlPS0hVQk JJTktVSktLVUpCS0JZBg++ DKIM-Signature: a=rsa-sha256; b=a8vY9GZLrLFJA9Epxm8DFpwotP6Ktm3Iv64lfTXz0NlLfQ8OZ7jl/dPdtyJ6kZaxEVLGF8cpv/ODOehuhRhUE/VACwMMcH8KrFCKmWZDGcm1wercTeuFL7GSn5bADXqReIKm/HEE4Syr7vjctGHZgqtKOa8uQuImylIGGx3DDi8=; c=relaxed/relaxed; s=default; d=hj-micro.com; v=1; bh=0uEessHzcSfxsC9/R4E/G5cHhOHZfHSBc4M8wjJU3EI=; h=date:mime-version:subject:message-id:from; Hi Robin: Yes, that's exactly what I'm saying. I've tested this on actual multi-DTM hardware, and the hardware does not ignore wp_dev_sel2 automatically — it must be correctly configured by software. Thanks! Allen On 9/8/2026 11:04 PM, Robin Murphy wrote: > https://support.arm.com/documentation/102308/0307/Debug-trace-and-PMU/ > Debug-Trace-system-overview/DTM-watchpoint?lang=en