From nobody Thu Oct 2 12:05:11 2025 Received: from mailout3.samsung.com (mailout3.samsung.com [203.254.224.33]) (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 6B05F337EBA for ; Wed, 17 Sep 2025 13:31:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=203.254.224.33 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758115864; cv=none; b=sZIABJUx4kOkf71Tzf4OTi4uGBle3bhpTk9v7c8EUybKHqm/xq4NytI3DsGpzIOPKwSgvH17mq8eQad9bzdAW3SYzbhA+8lGbKyVwr29EUQ+xfWijfc6ylznkMMSuk0Bslp7tl50lTCQ+Kmki/Kt4mrQlPthKfr+xQ2uePXHwQY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758115864; c=relaxed/simple; bh=bBNRVqm0xNP2bUegYaeeW1aFmcjZpJaGNmJt5fBNr4k=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:MIME-Version: Content-Type:References; b=eD3CDnoU54f00KBGSiVPQ3dLnioIkkhlSRxdsMi2xDt4+rZapMXEvd856W++2T8GcvIs3gL23GKv2X10hXGEwUus87F0noRcZTn9DWMmLLAx/aO0Y2YYInHxUnlkVhxM0/W7IlsKiyEVsNt3Wf30TaddPqz0t4gArcV8iHuuBrs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com; spf=pass smtp.mailfrom=samsung.com; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b=XtU4Ii6g; arc=none smtp.client-ip=203.254.224.33 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=samsung.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="XtU4Ii6g" Received: from epcas5p4.samsung.com (unknown [182.195.41.42]) by mailout3.samsung.com (KnoxPortal) with ESMTP id 20250917133100epoutp03e2155352856987734354f2c4f81c4dd4~mFQ9vtN0B2740227402epoutp03k for ; Wed, 17 Sep 2025 13:31:00 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout3.samsung.com 20250917133100epoutp03e2155352856987734354f2c4f81c4dd4~mFQ9vtN0B2740227402epoutp03k DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1758115860; bh=47MZ+V0NL7IUSooPzfSTYCMJEyy6bhIfvUpbYlXE654=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XtU4Ii6gEkq3cyherUoMp08oJJU1mSIB8eGsFC01rzVXVTdCPFjHo6qgVYSxU5WGF NQGYDA4G3rpHYM6XD8u4tOw29EPqlCV/ZecOhtFALG+W36lgS6NhzEVkcyU33MJ8uw CDkmpo57HJxZAl2N31TBKF3J0+vtRv1r46pcsgp8= Received: from epsnrtp03.localdomain (unknown [182.195.42.155]) by epcas5p1.samsung.com (KnoxPortal) with ESMTPS id 20250917133100epcas5p15b7f82eba259bafd644edd73bfd21166~mFQ9eHgPs0664606646epcas5p1i; Wed, 17 Sep 2025 13:31:00 +0000 (GMT) Received: from epcas5p2.samsung.com (unknown [182.195.38.92]) by epsnrtp03.localdomain (Postfix) with ESMTP id 4cRfmM238jz3hhT3; Wed, 17 Sep 2025 13:30:59 +0000 (GMT) Received: from epsmtip1.samsung.com (unknown [182.195.34.30]) by epcas5p3.samsung.com (KnoxPortal) with ESMTPA id 20250917133058epcas5p33af456c574a095b53001521358bae67a~mFQ7yAc3P3265832658epcas5p31; Wed, 17 Sep 2025 13:30:58 +0000 (GMT) Received: from test-PowerEdge-R740xd.samsungds.net (unknown [107.99.41.79]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20250917133057epsmtip1baab1e8cb410c08fbf3884b7465c5bea~mFQ6ti_NF0528605286epsmtip1v; Wed, 17 Sep 2025 13:30:57 +0000 (GMT) From: Neeraj Kumar To: linux-cxl@vger.kernel.org, nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org, gost.dev@samsung.com Cc: a.manzanares@samsung.com, vishak.g@samsung.com, neeraj.kernel@gmail.com, Neeraj Kumar Subject: [PATCH V3 20/20] cxl/pmem: Add CXL LSA 2.1 support in cxl pmem Date: Wed, 17 Sep 2025 18:59:40 +0530 Message-Id: <20250917132940.1566437-21-s.neeraj@samsung.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250917132940.1566437-1-s.neeraj@samsung.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CMS-MailID: 20250917133058epcas5p33af456c574a095b53001521358bae67a X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 105P cpgsPolicy: CPGSC10-542,Y X-CFilter-Loop: Reflected X-CMS-RootMailID: 20250917133058epcas5p33af456c574a095b53001521358bae67a References: <20250917132940.1566437-1-s.neeraj@samsung.com> Add support of CXL LSA 2.1 using NDD_REGION_LABELING flag. It creates cxl region based on region information parsed from LSA. Signed-off-by: Neeraj Kumar --- drivers/cxl/core/pmem_region.c | 53 ++++++++++++++++++++++++++++++++++ drivers/cxl/cxl.h | 4 +++ drivers/cxl/pmem.c | 2 ++ 3 files changed, 59 insertions(+) diff --git a/drivers/cxl/core/pmem_region.c b/drivers/cxl/core/pmem_region.c index 665b603c907b..3ef9c7d15041 100644 --- a/drivers/cxl/core/pmem_region.c +++ b/drivers/cxl/core/pmem_region.c @@ -290,3 +290,56 @@ int devm_cxl_add_pmem_region(struct cxl_region *cxlr) return rc; } EXPORT_SYMBOL_NS_GPL(devm_cxl_add_pmem_region, "CXL"); + +static int match_free_ep_decoder(struct device *dev, const void *data) +{ + struct cxl_decoder *cxld =3D to_cxl_decoder(dev); + + return !cxld->region; +} + +static struct cxl_decoder *cxl_find_free_ep_decoder(struct cxl_port *port) +{ + struct device *dev; + + dev =3D device_find_child(&port->dev, NULL, match_free_ep_decoder); + if (!dev) + return NULL; + + /* Release device ref taken via device_find_child() */ + put_device(dev); + return to_cxl_decoder(dev); +} + +void create_pmem_region(struct nvdimm *nvdimm) +{ + struct cxl_nvdimm *cxl_nvd; + struct cxl_memdev *cxlmd; + struct cxl_pmem_region_params *params; + struct cxl_root_decoder *cxlrd; + struct cxl_decoder *cxld; + struct cxl_region *cxlr; + + if (!nvdimm_has_cxl_region(nvdimm)) + return; + + lockdep_assert_held(&cxl_rwsem.region); + cxl_nvd =3D nvdimm_provider_data(nvdimm); + params =3D nvdimm_get_cxl_region_param(nvdimm); + cxlmd =3D cxl_nvd->cxlmd; + cxlrd =3D cxlmd->cxlrd; + + /* TODO: Region creation support only for interleave way =3D=3D 1 */ + if (!(params->nlabel =3D=3D 1)) + dev_info(&cxlmd->dev, + "Region Creation is not supported with iw > 1\n"); + else { + cxld =3D cxl_find_free_ep_decoder(cxlmd->endpoint); + cxlr =3D cxl_create_region(cxlrd, CXL_PARTMODE_PMEM, + atomic_read(&cxlrd->region_id), + params, cxld); + if (IS_ERR(cxlr)) + dev_info(&cxlmd->dev, "Region Creation failed\n"); + } +} +EXPORT_SYMBOL_NS_GPL(create_pmem_region, "CXL"); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index f01f8c942fdf..0a87ea79742a 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -910,6 +910,7 @@ cxl_create_region(struct cxl_root_decoder *cxlrd, bool is_cxl_pmem_region(struct device *dev); struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev); int devm_cxl_add_pmem_region(struct cxl_region *cxlr); +void create_pmem_region(struct nvdimm *nvdimm); #else static inline bool is_cxl_pmem_region(struct device *dev) { @@ -923,6 +924,9 @@ static inline int devm_cxl_add_pmem_region(struct cxl_r= egion *cxlr) { return 0; } +static inline void create_pmem_region(struct nvdimm *nvdimm) +{ +} #endif =20 void cxl_endpoint_parse_cdat(struct cxl_port *port); diff --git a/drivers/cxl/pmem.c b/drivers/cxl/pmem.c index 38a5bcdc68ce..0cdef01dbc68 100644 --- a/drivers/cxl/pmem.c +++ b/drivers/cxl/pmem.c @@ -135,6 +135,7 @@ static int cxl_nvdimm_probe(struct device *dev) return rc; =20 set_bit(NDD_LABELING, &flags); + set_bit(NDD_REGION_LABELING, &flags); set_bit(NDD_REGISTER_SYNC, &flags); set_bit(ND_CMD_GET_CONFIG_SIZE, &cmd_mask); set_bit(ND_CMD_GET_CONFIG_DATA, &cmd_mask); @@ -155,6 +156,7 @@ static int cxl_nvdimm_probe(struct device *dev) return -ENOMEM; =20 dev_set_drvdata(dev, nvdimm); + create_pmem_region(nvdimm); return devm_add_action_or_reset(dev, unregister_nvdimm, nvdimm); } =20 --=20 2.34.1