From nobody Sat Feb 7 07:11:23 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1770207224; cv=none; d=zohomail.com; s=zohoarc; b=XYxNM5PQKFAHqfvpIWl7ngIkfAfvoT12U/49dV4WYJXBwtFScuSSiejOcxmV56pPT6Bz5/5osN1j6fa/tJZ9vq2PliQFyUitKOF2/cF4R6fqh+MUE3c8n+/H5ANjcJATLIZi3mw4b+xgko0C+oGFx7LWdYuFNMMeCFUdvH+nyKU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1770207224; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Reply-To:Reply-To:References:Sender:Subject:Subject:To:To:Message-Id; bh=xG6PP9MpCmgnNj0hOROWGZwUGMPmNW28NyI7rz/lRrY=; b=acZJXsDDzFFFSu+HnilIbWsXElXM7C0BcwkeNsbhMdktmmI9ZTUdHYGiognaXl8hWTdaCbnR9TlfzSRb/ibix4RBQBw7g5A1PfRcZEJCkG8EVuudV/HiCdIcSrIypP3Uiqic6D1M6/IufX9xzb7kxjNm8LueEgATPkdleHCj0vM= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1770207224539977.5931114804307; Wed, 4 Feb 2026 04:13:44 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vnblF-0006Uc-H5; Wed, 04 Feb 2026 07:13:33 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vnblB-0006SH-Ls for qemu-devel@nongnu.org; Wed, 04 Feb 2026 07:13:29 -0500 Received: from frasgout.his.huawei.com ([185.176.79.56]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vnbl9-0007Jk-Cb for qemu-devel@nongnu.org; Wed, 04 Feb 2026 07:13:29 -0500 Received: from mail.maildlp.com (unknown [172.18.224.150]) by frasgout.his.huawei.com (SkyGuard) with ESMTPS id 4f5fP40DtdzHnGj0; Wed, 4 Feb 2026 20:12:24 +0800 (CST) Received: from dubpeml500005.china.huawei.com (unknown [7.214.145.207]) by mail.maildlp.com (Postfix) with ESMTPS id 5085F40565; Wed, 4 Feb 2026 20:13:25 +0800 (CST) Received: from SecurePC-101-06.huawei.com (10.122.19.247) by dubpeml500005.china.huawei.com (7.214.145.207) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Wed, 4 Feb 2026 12:13:23 +0000 To: Michael Tsirkin , , Davidlohr Bueso CC: , , Ravi Shankar , Marcel Apfelbaum , Markus Armbruster , Michael Roth Subject: [PATCH qemu v6 2/7] hw/cxl: Refactor component register initialization Date: Wed, 4 Feb 2026 12:12:10 +0000 Message-ID: <20260204121215.68897-3-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260204121215.68897-1-Jonathan.Cameron@huawei.com> References: <20260204121215.68897-1-Jonathan.Cameron@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.122.19.247] X-ClientProxiedBy: lhrpeml500012.china.huawei.com (7.191.174.4) To dubpeml500005.china.huawei.com (7.214.145.207) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=185.176.79.56; envelope-from=jonathan.cameron@huawei.com; helo=frasgout.his.huawei.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Jonathan Cameron From: Jonathan Cameron via qemu development Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1770207226715154100 Content-Type: text/plain; charset="utf-8" From: Ira Weiny CXL 3.2 8.2.4 Table 8-22 defines which capabilities are mandatory, not permitted, or optional for each type of device. cxl_component_register_init_common() uses a rather odd 'fall through' mechanism to define each component register set. This assumes that any device or capability being added builds on the previous devices capabilities. This is not true as there are mutually exclusive capabilities defined. For example, downstream ports can not have snoop but it can have Back Invalidate capable decoders. Refactor this code to make it easier to add individual capabilities as defined by a device type. Any capability which is not specified by the type is left NULL'ed out which complies with the packed nature of the register array. Update all spec references to 3.2. No functional changes should be seen with this patch. Signed-off-by: Ira Weiny Tested-by: Dongjoo Seo [rebased, no RAS for HBs, r3.2 references] Signed-off-by: Davidlohr Bueso Signed-off-by: Jonathan Cameron --- include/hw/cxl/cxl_component.h | 33 ++++++++++----- hw/cxl/cxl-component-utils.c | 75 +++++++++++----------------------- 2 files changed, 46 insertions(+), 62 deletions(-) diff --git a/include/hw/cxl/cxl_component.h b/include/hw/cxl/cxl_component.h index b0f2aa791431..1f167d3ef79b 100644 --- a/include/hw/cxl/cxl_component.h +++ b/include/hw/cxl/cxl_component.h @@ -32,10 +32,20 @@ enum reg_type { }; =20 /* - * Capability registers are defined at the top of the CXL.cache/mem region= and - * are packed. For our purposes we will always define the caps in the same - * order. - * CXL r3.1 Table 8-22: CXL_CAPABILITY_ID Assignment for details. + * CXL r3.2 - 8.2.4 Table 8-22 and 8-23 + * + * Capability registers are defined at the top of the CXL.cache/mem region. + * They are defined to be packed and at variable offsets. However, NULL + * capabilities can be added to the packed array. To facilitate easier ac= cess + * within the QEMU code, define these at specified offsets. Then NULL out= any + * capabilities for devices which don't (or can't) have a particular capab= ility + * (see cxl_component_register_init_common). NULL capabilities are to be + * ignored by software. + * + * 'offsets' are based on index's which can then be used to report the arr= ay + * size in CXL Capability Header Register (index/offset 0). + * + * See CXL r3.2 Table 8-25 for an example of allowing a 'NULL' header. */ =20 /* CXL r3.1 Section 8.2.4.1: CXL Capability Header Register */ @@ -46,16 +56,17 @@ REG32(CXL_CAPABILITY_HEADER, 0) FIELD(CXL_CAPABILITY_HEADER, CACHE_MEM_VERSION, 20, 4) FIELD(CXL_CAPABILITY_HEADER, ARRAY_SIZE, 24, 8) =20 -#define CXLx_CAPABILITY_HEADER(type, offset) \ - REG32(CXL_##type##_CAPABILITY_HEADER, offset) \ +#define CXLx_CAPABILITY_HEADER(type, idx) \ + enum { CXL_##type##_CAP_HDR_IDX =3D idx }; \ + REG32(CXL_##type##_CAPABILITY_HEADER, (idx * 0x4)) \ FIELD(CXL_##type##_CAPABILITY_HEADER, ID, 0, 16) \ FIELD(CXL_##type##_CAPABILITY_HEADER, VERSION, 16, 4) \ FIELD(CXL_##type##_CAPABILITY_HEADER, PTR, 20, 12) -CXLx_CAPABILITY_HEADER(RAS, 0x4) -CXLx_CAPABILITY_HEADER(LINK, 0x8) -CXLx_CAPABILITY_HEADER(HDM, 0xc) -CXLx_CAPABILITY_HEADER(EXTSEC, 0x10) -CXLx_CAPABILITY_HEADER(SNOOP, 0x14) +CXLx_CAPABILITY_HEADER(RAS, 1) +CXLx_CAPABILITY_HEADER(LINK, 2) +CXLx_CAPABILITY_HEADER(HDM, 3) +CXLx_CAPABILITY_HEADER(EXTSEC, 4) +CXLx_CAPABILITY_HEADER(SNOOP, 5) =20 /* * Capability structures contain the actual registers that the CXL compone= nt diff --git a/hw/cxl/cxl-component-utils.c b/hw/cxl/cxl-component-utils.c index 473895948b3d..91770f103a85 100644 --- a/hw/cxl/cxl-component-utils.c +++ b/hw/cxl/cxl-component-utils.c @@ -284,32 +284,6 @@ void cxl_component_register_init_common(uint32_t *reg_= state, { int caps =3D 0; =20 - /* - * In CXL 2.0 the capabilities required for each CXL component are such - * that, with the ordering chosen here, a single number can be used to - * define which capabilities should be provided. - */ - switch (type) { - case CXL2_DOWNSTREAM_PORT: - case CXL2_DEVICE: - /* RAS, Link */ - caps =3D 2; - break; - case CXL2_UPSTREAM_PORT: - case CXL2_TYPE3_DEVICE: - case CXL2_LOGICAL_DEVICE: - /* + HDM */ - caps =3D 3; - break; - case CXL2_ROOT_PORT: - case CXL2_RC: - /* + Extended Security, + Snoop */ - caps =3D 5; - break; - default: - abort(); - } - memset(reg_state, 0, CXL2_COMPONENT_CM_REGION_SIZE); =20 /* CXL Capability Header Register */ @@ -317,11 +291,12 @@ void cxl_component_register_init_common(uint32_t *reg= _state, ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, VERSION, CXL_CAPABILITY_VERSION); ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, CACHE_MEM_VERSION, = 1); - ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, ARRAY_SIZE, caps); =20 #define init_cap_reg(reg, id, version) = \ do { = \ - int which =3D R_CXL_##reg##_CAPABILITY_HEADER; = \ + int which =3D CXL_##reg##_CAP_HDR_IDX; = \ + if (CXL_##reg##_CAP_HDR_IDX > caps) = \ + caps =3D CXL_##reg##_CAP_HDR_IDX; = \ reg_state[which] =3D FIELD_DP32(reg_state[which], = \ CXL_##reg##_CAPABILITY_HEADER, ID, i= d); \ reg_state[which] =3D = \ @@ -332,37 +307,35 @@ void cxl_component_register_init_common(uint32_t *reg= _state, CXL_##reg##_REGISTERS_OFFSET); = \ } while (0) =20 + /* CXL r3.2 8.2.4 Table 8-22 */ switch (type) { - case CXL2_DEVICE: - case CXL2_TYPE3_DEVICE: - case CXL2_LOGICAL_DEVICE: case CXL2_ROOT_PORT: + case CXL2_RC: + /* + Extended Security, + Snoop */ + init_cap_reg(EXTSEC, 6, 1); + init_cap_reg(SNOOP, 8, 1); + /* fallthrough */ case CXL2_UPSTREAM_PORT: + case CXL2_TYPE3_DEVICE: + case CXL2_LOGICAL_DEVICE: + /* + HDM */ + init_cap_reg(HDM, 5, 1); + hdm_init_common(reg_state, write_msk, type); + /* fallthrough */ case CXL2_DOWNSTREAM_PORT: - init_cap_reg(RAS, 2, CXL_RAS_CAPABILITY_VERSION); - ras_init_common(reg_state, write_msk); + case CXL2_DEVICE: + /* RAS, Link */ + if (type !=3D CXL2_RC) { + init_cap_reg(RAS, 2, 2); + ras_init_common(reg_state, write_msk); + } + init_cap_reg(LINK, 4, 2); break; default: - break; - } - - init_cap_reg(LINK, 4, CXL_LINK_CAPABILITY_VERSION); - - if (caps < 3) { - return; - } - - if (type !=3D CXL2_ROOT_PORT) { - init_cap_reg(HDM, 5, CXL_HDM_CAPABILITY_VERSION); - hdm_init_common(reg_state, write_msk, type); - } - if (caps < 5) { - return; + abort(); } =20 - init_cap_reg(EXTSEC, 6, CXL_EXTSEC_CAP_VERSION); - init_cap_reg(SNOOP, 8, CXL_SNOOP_CAP_VERSION); - + ARRAY_FIELD_DP32(reg_state, CXL_CAPABILITY_HEADER, ARRAY_SIZE, caps); #undef init_cap_reg } =20 --=20 2.51.0