From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f174.google.com (mail-pl1-f174.google.com [209.85.214.174]) (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 DE3E0126F1E; Tue, 26 Mar 2024 18:30:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.174 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711477844; cv=none; b=YeWKXdoVCMc8l07WBO2mV03AK0M0SETDNoYEkUAtEBU5imquXnnlBkEuhuAXF/DeFejx8rGrotJ1iMLMM7q6atuHc47bTtgN0YMryDXWV4SQAPBqRuZfojon3YWQd2vCSvueo5I4yCnFVIsDeNtvJneH7SSsiKaE2DUQTXaWBlc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711477844; c=relaxed/simple; bh=sAyOUEKczk4vCaBI7fCgM6yZpeBEglMUpPYimbD3Wuk=; h=From:Date:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=KbCqMNDzkTV3vlv/bpARPKNj/RfxUO+XmQR/dgmVFbjT4yvI4ZYNeUuILT4y2F/yFNJzwdSB/KUV/tnatDUtpYkNQb24rn9P6dfVX5YsmyXgwOkp5Fd8tIbXpRDzuAM85ffy6Ezu0OjIzfHIqrn+Wl2MuSsY+Odi72X5W4y7wxQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=kdvVyUnw; arc=none smtp.client-ip=209.85.214.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="kdvVyUnw" Received: by mail-pl1-f174.google.com with SMTP id d9443c01a7336-1e0411c0a52so43850265ad.0; Tue, 26 Mar 2024 11:30:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1711477842; x=1712082642; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:date:from:from:to:cc:subject:date:message-id:reply-to; bh=iUdKOd7rx0WMRV6Jyf1lEVlg1MEyH9tPtK2n/H0R3Jk=; b=kdvVyUnwuw/NoXtocv9KZPkO6Q0B00DUWa3qUrgcUIB+nZxDOiGb76T5hk3T/0Fxs1 meuoUDt6m1Tj1UYAAzyfzNvWkb6KJU/lqgMpfq/HEke3RIPM2gEtfeoTXdV4QME4ZASL UyFrB6v7Ft5rapQ7Tz6au2wI43/Y+NaTdeBMN8gZjiKe4pLI32ijmsDj6qC7BisvS3+Y yvmAkdVTeSmM6gglnd8rvVhzdvL6quf2RKTty2clFP/yfVT08ziQcCGqHU4pk+JQ6vDt LpdJ2jKqI07wmijtDwBEATzhx7ux/YKm72qGCxMuBpaotz5qy/8SaWMhFDWTpAx0s6Vq jz5A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1711477842; x=1712082642; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:date:from:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=iUdKOd7rx0WMRV6Jyf1lEVlg1MEyH9tPtK2n/H0R3Jk=; b=RsYjdf+kWbt+yMrqQyTDwBp/u+Mbyw5gJPxIN6+3JVwMseo/WO9GydJnhLsFiOVdcj xK1L/kKoklMp8hMty9f/wkfhYFO5Ej9GINSyRTZfWq/RUi+Q9dHzWiOI41RM8WH6J7v8 VLGxf6rXI+G+AZKCtSzFXANjzo74ejw2uV1WvshIuQcaWsKPEgkgQCWdDpnli8bRXnhf jchcp+CCwWBODsn7ccDMkrBYfT+hUPcaXJe08CaZlpbzogJ3NMFroBcsHdCY2z+U0ETQ rssSyb9WTSxUV56MQKpeHeBB51+n9eyeZUMT7mEK2tzMTRLonypzdjuUcKo9Lm9vY+hO MXOw== X-Forwarded-Encrypted: i=1; AJvYcCW/EIxbmPZg9RY8R5tB1JFn7XQlcgR4HCPdBTXq8O3xsnxTjD+nIp4JEs8CTz04lxFEmRjrP/BM9j9yocNNn4CQhJ+1ZNWM++6/6mnh6DuGS1GlC4t2ML1HFJw7nlVrrJXpci3L7LU81ytxcBFewNKblE7/o1tfYdeV9A7R7M1taz+/PUw= X-Gm-Message-State: AOJu0Yza8mOB9A8V4627snxwLKjRalbdEm/owkMgSKlooYnWoO0uUAUH Nd8/REnGVoYHrhvC221Z5JuhiiKNu5rqwum3OgAZXkNZI+5oLjh7 X-Google-Smtp-Source: AGHT+IHh6JX3lwXrIJoiJWTgBiw0gt3RVc2+M2dHJ2GjDbmxIo2EmZBN6zLFVtqAVrcjEF8ZgUfndA== X-Received: by 2002:a17:902:da8c:b0:1e0:b60e:1a1f with SMTP id j12-20020a170902da8c00b001e0b60e1a1fmr7673040plx.8.1711477841957; Tue, 26 Mar 2024 11:30:41 -0700 (PDT) Received: from debian ([2601:641:300:14de:69a2:b1ff:1efd:f4a9]) by smtp.gmail.com with ESMTPSA id x3-20020a170902ec8300b001e035cecd27sm7185044plg.129.2024.03.26.11.30.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Mar 2024 11:30:41 -0700 (PDT) From: fan X-Google-Original-From: fan Date: Tue, 26 Mar 2024 11:30:38 -0700 To: Davidlohr Bueso Cc: ira.weiny@intel.com, Dave Jiang , Fan Ni , Jonathan Cameron , Navneet Singh , Dan Williams , Alison Schofield , Vishal Verma , linux-btrfs@vger.kernel.org, linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 08/26] cxl/mem: Expose device dynamic capacity capabilities Message-ID: References: <20240324-dcd-type2-upstream-v1-0-b7b00d623625@intel.com> <20240324-dcd-type2-upstream-v1-8-b7b00d623625@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, Mar 25, 2024 at 04:40:16PM -0700, Davidlohr Bueso wrote: > On Sun, 24 Mar 2024, ira.weiny@intel.com wrote: > > > +What: /sys/bus/cxl/devices/memX/dc/region_count > > +Date: June, 2024 > > +KernelVersion: v6.10 > > +Contact: linux-cxl@vger.kernel.org > > +Description: > > + (RO) Number of Dynamic Capacity (DC) regions supported on the > > + device. May be 0 if the device does not support Dynamic > > + Capacity. > > If dcd is not supported then we should not have the dc/ directory > altogether. > > Thanks, > Davidlohr I also think so. However, I also noticed one thing (not DCD related). Even for a PMEM device, for example, we have a ram directory under the device directory. =================== root@DT:~# cxl list [ { "memdev":"mem0", "pmem_size":536870912, "serial":0, "host":"0000:0d:00.0" } ] root@DT:~# ls /sys/bus/cxl/devices/mem0/ dc dev driver firmware firmware_version label_storage_size numa_node payload_max pmem pmem0 ram security serial subsystem trigger_poison_list uevent root@DT:~# =================== Fan