From patchwork Mon Aug 9 22:28:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12427365 Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) (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 1E22B6D00 for ; Mon, 9 Aug 2021 22:28:36 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10070"; a="278543815" X-IronPort-AV: E=Sophos;i="5.84,308,1620716400"; d="scan'208";a="278543815" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Aug 2021 15:28:35 -0700 X-IronPort-AV: E=Sophos;i="5.84,308,1620716400"; d="scan'208";a="444726830" Received: from dwillia2-desk3.jf.intel.com (HELO dwillia2-desk3.amr.corp.intel.com) ([10.54.39.25]) by fmsmga007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Aug 2021 15:28:35 -0700 Subject: [PATCH 09/23] libnvdimm/labels: Add address-abstraction uuid definitions From: Dan Williams To: linux-cxl@vger.kernel.org Cc: nvdimm@lists.linux.dev, Jonathan.Cameron@huawei.com, ben.widawsky@intel.com, vishal.l.verma@intel.com, alison.schofield@intel.com, ira.weiny@intel.com Date: Mon, 09 Aug 2021 15:28:35 -0700 Message-ID: <162854811511.1980150.3921515741758120378.stgit@dwillia2-desk3.amr.corp.intel.com> In-Reply-To: <162854806653.1980150.3354618413963083778.stgit@dwillia2-desk3.amr.corp.intel.com> References: <162854806653.1980150.3354618413963083778.stgit@dwillia2-desk3.amr.corp.intel.com> User-Agent: StGit/0.18-3-g996c Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The EFI definition of the labels represents the Linux "claim class" with a GUID. The CXL definition of the labels stores the same identifier in UUID byte order. In preparation for adding CXL label support, enable the claim class to optionally handle uuids. Signed-off-by: Dan Williams Reviewed-by: Jonathan Cameron --- drivers/nvdimm/label.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 52 insertions(+), 2 deletions(-) diff --git a/drivers/nvdimm/label.c b/drivers/nvdimm/label.c index 7f473f9db300..2ba31b883b28 100644 --- a/drivers/nvdimm/label.c +++ b/drivers/nvdimm/label.c @@ -17,6 +17,11 @@ static guid_t nvdimm_btt2_guid; static guid_t nvdimm_pfn_guid; static guid_t nvdimm_dax_guid; +static uuid_t nvdimm_btt_uuid; +static uuid_t nvdimm_btt2_uuid; +static uuid_t nvdimm_pfn_uuid; +static uuid_t nvdimm_dax_uuid; + static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0"; static u32 best_seq(u32 a, u32 b) @@ -724,7 +729,7 @@ static unsigned long nd_label_offset(struct nvdimm_drvdata *ndd, - (unsigned long) to_namespace_index(ndd, 0); } -static enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid) +static enum nvdimm_claim_class guid_to_nvdimm_cclass(guid_t *guid) { if (guid_equal(guid, &nvdimm_btt_guid)) return NVDIMM_CCLASS_BTT; @@ -740,6 +745,23 @@ static enum nvdimm_claim_class to_nvdimm_cclass(guid_t *guid) return NVDIMM_CCLASS_UNKNOWN; } +/* CXL labels store UUIDs instead of GUIDs for the same data */ +enum nvdimm_claim_class uuid_to_nvdimm_cclass(uuid_t *uuid) +{ + if (uuid_equal(uuid, &nvdimm_btt_uuid)) + return NVDIMM_CCLASS_BTT; + else if (uuid_equal(uuid, &nvdimm_btt2_uuid)) + return NVDIMM_CCLASS_BTT2; + else if (uuid_equal(uuid, &nvdimm_pfn_uuid)) + return NVDIMM_CCLASS_PFN; + else if (uuid_equal(uuid, &nvdimm_dax_uuid)) + return NVDIMM_CCLASS_DAX; + else if (uuid_equal(uuid, &uuid_null)) + return NVDIMM_CCLASS_NONE; + + return NVDIMM_CCLASS_UNKNOWN; +} + static const guid_t *to_abstraction_guid(enum nvdimm_claim_class claim_class, guid_t *target) { @@ -761,6 +783,29 @@ static const guid_t *to_abstraction_guid(enum nvdimm_claim_class claim_class, return &guid_null; } +/* CXL labels store UUIDs instead of GUIDs for the same data */ +__maybe_unused +static const uuid_t *to_abstraction_uuid(enum nvdimm_claim_class claim_class, + uuid_t *target) +{ + if (claim_class == NVDIMM_CCLASS_BTT) + return &nvdimm_btt_uuid; + else if (claim_class == NVDIMM_CCLASS_BTT2) + return &nvdimm_btt2_uuid; + else if (claim_class == NVDIMM_CCLASS_PFN) + return &nvdimm_pfn_uuid; + else if (claim_class == NVDIMM_CCLASS_DAX) + return &nvdimm_dax_uuid; + else if (claim_class == NVDIMM_CCLASS_UNKNOWN) { + /* + * If we're modifying a namespace for which we don't + * know the claim_class, don't touch the existing uuid. + */ + return target; + } else + return &uuid_null; +} + static void reap_victim(struct nd_mapping *nd_mapping, struct nd_label_ent *victim) { @@ -808,7 +853,7 @@ enum nvdimm_claim_class nsl_get_claim_class(struct nvdimm_drvdata *ndd, { if (!namespace_label_has(ndd, abstraction_guid)) return NVDIMM_CCLASS_NONE; - return to_nvdimm_cclass(&nd_label->abstraction_guid); + return guid_to_nvdimm_cclass(&nd_label->abstraction_guid); } static int __pmem_label_update(struct nd_region *nd_region, @@ -1395,5 +1440,10 @@ int __init nd_label_init(void) WARN_ON(guid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_guid)); WARN_ON(guid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_guid)); + WARN_ON(uuid_parse(NVDIMM_BTT_GUID, &nvdimm_btt_uuid)); + WARN_ON(uuid_parse(NVDIMM_BTT2_GUID, &nvdimm_btt2_uuid)); + WARN_ON(uuid_parse(NVDIMM_PFN_GUID, &nvdimm_pfn_uuid)); + WARN_ON(uuid_parse(NVDIMM_DAX_GUID, &nvdimm_dax_uuid)); + return 0; }