From patchwork Thu Feb 20 19:42:44 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Jiang X-Patchwork-Id: 13984452 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 80AA62638AE for ; Thu, 20 Feb 2025 19:44:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740080689; cv=none; b=EQlXgRuT5BzMkWmvCYOv2wLiCegNhmQL9UkludaIcAxlx3ierTVRS5QMGoHCj3SV+lXnoS1p9P4UK+B6kBv5D6oQemU9Ze6kn/29aFgtLvkLRIFzMvLf77vRvA4KftDI7Faag6lUxvKkECOHg/bH+Ff71XWzKeh1CO300kDDKL0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740080689; c=relaxed/simple; bh=yAauHhOj6GQ4QdqND1tst8enxYRl/4gGiqyV6stfv5g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gKciR3wtRHXWK/VCLgS0ell5sBOqw+tw2q+g8r8edxQ/krql9DEOzAuxXzFed+qeg6wiwZgG9XxY3jOzSTiVL7zh9HlIc5rs4Rq1gaLEjJFVte/zXTpnpwZJtPq6O3fhX/oxmMjBEFX4enLl8kPVd5PHxSir8huEVD41NEwhJjg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 46A0CC4CED1; Thu, 20 Feb 2025 19:44:49 +0000 (UTC) From: Dave Jiang To: linux-cxl@vger.kernel.org Cc: dan.j.williams@intel.com, ira.weiny@intel.com, vishal.l.verma@intel.com, alison.schofield@intel.com, Jonathan.Cameron@huawei.com, dave@stgolabs.net, jgg@nvidia.com, shiju.jose@huawei.com, Li Ming Subject: [PATCH v7 06/14] cxl: Setup exclusive CXL features that are reserved for the kernel Date: Thu, 20 Feb 2025 12:42:44 -0700 Message-ID: <20250220194438.2281088-7-dave.jiang@intel.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250220194438.2281088-1-dave.jiang@intel.com> References: <20250220194438.2281088-1-dave.jiang@intel.com> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Certain features will be exclusively used by components such as in kernel RAS driver. Setup an exclusion list that can be used to detect if a feature is exclusive to the kernel. Reviewed-by: Jonathan Cameron Reviewed-by: Dan Williams Reviewed-by: Li Ming Tested-by: Shiju Jose Signed-off-by: Dave Jiang --- drivers/cxl/core/features.c | 28 ++++++++++++++++++++++++++++ include/cxl/features.h | 34 ++++++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+) diff --git a/drivers/cxl/core/features.c b/drivers/cxl/core/features.c index 17a82734a340..048ba4fc3538 100644 --- a/drivers/cxl/core/features.c +++ b/drivers/cxl/core/features.c @@ -7,6 +7,28 @@ #include "core.h" #include "cxlmem.h" +/* All the features below are exclusive to the kernel */ +static const uuid_t cxl_exclusive_feats[] = { + CXL_FEAT_PATROL_SCRUB_UUID, + CXL_FEAT_ECS_UUID, + CXL_FEAT_SPPR_UUID, + CXL_FEAT_HPPR_UUID, + CXL_FEAT_CACHELINE_SPARING_UUID, + CXL_FEAT_ROW_SPARING_UUID, + CXL_FEAT_BANK_SPARING_UUID, + CXL_FEAT_RANK_SPARING_UUID, +}; + +static bool is_cxl_feature_exclusive(struct cxl_feat_entry *entry) +{ + for (int i = 0; i < ARRAY_SIZE(cxl_exclusive_feats); i++) { + if (uuid_equal(&entry->uuid, &cxl_exclusive_feats[i])) + return true; + } + + return false; +} + inline struct cxl_features_state *to_cxlfs(struct cxl_dev_state *cxlds) { return cxlds->cxlfs; @@ -47,6 +69,7 @@ get_supported_features(struct cxl_features_state *cxlfs) struct cxl_mbox_get_sup_feats_in mbox_in; struct cxl_feat_entry *entry; struct cxl_mbox_cmd mbox_cmd; + int user_feats = 0; int count; count = cxl_get_supported_features_count(cxl_mbox); @@ -121,6 +144,10 @@ get_supported_features(struct cxl_features_state *cxlfs) return NULL; memcpy(entry, mbox_out->ents, retrieved); + for (int i = 0; i < num_entries; i++) { + if (!is_cxl_feature_exclusive(entry + i)) + user_feats++; + } entry += num_entries; /* * If the number of output entries is less than expected, add the @@ -131,6 +158,7 @@ get_supported_features(struct cxl_features_state *cxlfs) } while (remain_feats); entries->num_features = count; + entries->num_user_features = user_feats; return no_free_ptr(entries); } diff --git a/include/cxl/features.h b/include/cxl/features.h index ae56ef7ec9ab..d2cde46b0fec 100644 --- a/include/cxl/features.h +++ b/include/cxl/features.h @@ -5,6 +5,39 @@ #include +/* Feature UUIDs used by the kernel */ +#define CXL_FEAT_PATROL_SCRUB_UUID \ + UUID_INIT(0x96dad7d6, 0xfde8, 0x482b, 0xa7, 0x33, 0x75, 0x77, 0x4e, \ + 0x06, 0xdb, 0x8a) + +#define CXL_FEAT_ECS_UUID \ + UUID_INIT(0xe5b13f22, 0x2328, 0x4a14, 0xb8, 0xba, 0xb9, 0x69, 0x1e, \ + 0x89, 0x33, 0x86) + +#define CXL_FEAT_SPPR_UUID \ + UUID_INIT(0x892ba475, 0xfad8, 0x474e, 0x9d, 0x3e, 0x69, 0x2c, 0x91, \ + 0x75, 0x68, 0xbb) + +#define CXL_FEAT_HPPR_UUID \ + UUID_INIT(0x80ea4521, 0x786f, 0x4127, 0xaf, 0xb1, 0xec, 0x74, 0x59, \ + 0xfb, 0x0e, 0x24) + +#define CXL_FEAT_CACHELINE_SPARING_UUID \ + UUID_INIT(0x96C33386, 0x91dd, 0x44c7, 0x9e, 0xcb, 0xfd, 0xaf, 0x65, \ + 0x03, 0xba, 0xc4) + +#define CXL_FEAT_ROW_SPARING_UUID \ + UUID_INIT(0x450ebf67, 0xb135, 0x4f97, 0xa4, 0x98, 0xc2, 0xd5, 0x7f, \ + 0x27, 0x9b, 0xed) + +#define CXL_FEAT_BANK_SPARING_UUID \ + UUID_INIT(0x78b79636, 0x90ac, 0x4b64, 0xa4, 0xef, 0xfa, 0xac, 0x5d, \ + 0x18, 0xa8, 0x63) + +#define CXL_FEAT_RANK_SPARING_UUID \ + UUID_INIT(0x34dbaff5, 0x0552, 0x4281, 0x8f, 0x76, 0xda, 0x0b, 0x5e, \ + 0x7a, 0x76, 0xa7) + /* Feature commands capability supported by a device */ enum cxl_features_capability { CXL_FEATURES_NONE = 0, @@ -134,6 +167,7 @@ struct cxl_features_state { struct cxl_dev_state *cxlds; struct cxl_feat_entries { int num_features; + int num_user_features; struct cxl_feat_entry ent[] __counted_by(num_features); } *entries; };