From patchwork Wed Sep 25 02:46:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Ying" X-Patchwork-Id: 13811558 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.19]) (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 973C8149DF7; Wed, 25 Sep 2024 02:47:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.19 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727232447; cv=none; b=q981fXf05DynEuGHMG0bmOmucseLK6g+SNPYbWENtaOJJwgm5Sv8mrBl487YDCIHezxesSDcKT/OTeCdwt3+MQVd9OmRaRo98lZMe9NT06ARmDZpYN4K+aNDP380uK2fdFVZ8TLlDt2jLEHqS+1qhmY/nZbo6NIsRfL+5sSdlLU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727232447; c=relaxed/simple; bh=fiHK4fG65Xon9kkcXibHaO9Hg0EgB8moOgev/gWVaq0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=QbFfEMDeRBVdfOARzZWootiO15dQWIDlFN4XQIfq1bFb6cQxWP+gFcpAfagYt/6fMMzQrdHT9RVzX9AG6lj3yhluEg1MHNAHzeWQcMOSynnPYpYels0NjhEluGU2nFSn1NHzW8PzDTXS7UgTsFo+3IRmPa/tg11iN3lJ6KkOqc8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=F01CkFB8; arc=none smtp.client-ip=198.175.65.19 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="F01CkFB8" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1727232446; x=1758768446; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=fiHK4fG65Xon9kkcXibHaO9Hg0EgB8moOgev/gWVaq0=; b=F01CkFB8UgT9Zdz+YaGj0yIfv+REVvgYkSMrDj371N+LUaZp2WsotZIL ZndZkLvkhrsMX6hWTCo/h9fQJ+IprkdrB0iyGabrCeIDKSo6jYQteb/Rn CeSJiWwIXkyIqDmMASV2WmEXEAh+AeekPYH7DE5TzBeM0HgJa0LwF1xFt /PIzn87kfPHVV9vRyk8YHrM2yZSGPf98J4uHc5RSMx/rPuIKKoiVSkuZa qGyBH+0FMSlj/uuirPOPGhUza3ppq45v/adb5nQqnwrINR0IMF2auwZBb xxiueLPZhqY8BdIAJrPofGiAuUpXfqDoQctOtIE+Mu43cZ49ItPTwU+B8 Q==; X-CSE-ConnectionGUID: hDIZOXMpTlGBwS7Jo/BI6w== X-CSE-MsgGUID: vIOnRRAyQ361nmUje2JJeg== X-IronPort-AV: E=McAfee;i="6700,10204,11205"; a="26132074" X-IronPort-AV: E=Sophos;i="6.10,256,1719903600"; d="scan'208";a="26132074" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa111.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2024 19:47:25 -0700 X-CSE-ConnectionGUID: moQoaoE4S9m+ypWf8ECacg== X-CSE-MsgGUID: 6WX5nXaVQaOAq5hfkePxAg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,256,1719903600"; d="scan'208";a="102389059" Received: from yhuang6-mobl2.sh.intel.com ([10.238.3.32]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2024 19:47:22 -0700 From: Huang Ying To: Dan Williams , Dave Jiang Cc: linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, Huang Ying , Davidlohr Bueso , Jonathan Cameron , Alison Schofield , Vishal Verma , Ira Weiny , Alejandro Lucero Subject: [RFC 5/5] cxl: Avoid to create dax regions for type2 accelerators Date: Wed, 25 Sep 2024 10:46:47 +0800 Message-Id: <20240925024647.46735-6-ying.huang@intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240925024647.46735-1-ying.huang@intel.com> References: <20240925024647.46735-1-ying.huang@intel.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The memory range of a type2 accelerator should be managed by the type2 accelerator specific driver instead of the common dax region drivers, as discussed in [1]. [1] https://lore.kernel.org/linux-cxl/66469ff1b8fbc_2c2629427@dwillia2-xfh.jf.intel.com.notmuch/ So, in this patch, we skip dax regions creation for type2 accelerator device memory regions. Based on: https://lore.kernel.org/linux-cxl/168592159835.1948938.1647215579839222774.stgit@dwillia2-xfh.jf.intel.com/ Signed-off-by: "Huang, Ying" Co-developed-by: Dan Williams Signed-off-by: Dan Williams Cc: Davidlohr Bueso Cc: Jonathan Cameron Cc: Dave Jiang Cc: Alison Schofield Cc: Vishal Verma Cc: Ira Weiny Cc: Alejandro Lucero Reviewed-by: Gregory Price --- drivers/cxl/core/region.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index 9c68ec445128..b276752c38da 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -3466,6 +3466,14 @@ static int cxl_region_probe(struct device *dev) p->res->start, p->res->end, cxlr, is_system_ram) > 0) return 0; + /* + * Accelerator regions have specific usage, skip + * device-dax registration. + */ + if (cxlr->type == CXL_DECODER_ACCEL) + return 0; + + /* Expander routes to device-dax */ return devm_cxl_add_dax_region(cxlr); default: dev_dbg(&cxlr->dev, "unsupported region mode: %d\n",