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De Francesco" , Terry Bowman , Joshua Hahn , Robert Richter Subject: [PATCH v9 02/13] cxl/region: Store root decoder in struct cxl_region Date: Sat, 10 Jan 2026 12:46:47 +0100 Message-ID: <20260110114705.681676-3-rrichter@amd.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260110114705.681676-1-rrichter@amd.com> References: <20260110114705.681676-1-rrichter@amd.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-ClientProxiedBy: satlexmb07.amd.com (10.181.42.216) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF000397B4:EE_|BY5PR12MB4049:EE_ X-MS-Office365-Filtering-Correlation-Id: e6713d01-9922-458e-4629-08de503e0960 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|36860700013|1800799024|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?804DTDVuX4XOyUyVBjP4HCjQnL+dYV4y2YlUfiBtTzu39w0Up208F3BlKHGn?= =?us-ascii?Q?NT/eOIeRSEmxbQnIba4i2hLUeqgbluSm5Mvu+SEXGyHZ9+VIyus22Meg4Lc2?= =?us-ascii?Q?PH40W1McHbqYCorKDwy1awQjy14tN2DOmaqWc0Y4DRh0O0vwtcSgUqxm14Z1?= =?us-ascii?Q?lozowVODst7UEgknWRKwmeX/ncF2SPrruoeyPqxQNFLTtRoDQtueB/hYBxvf?= =?us-ascii?Q?c9safQgb6M41kxNH/wIbC/u96Av3iaf/2wiozodU3W8EYIOyDhvS6QIfkt3d?= =?us-ascii?Q?Yd1UZwWesQk1KLSCZ4qyjhWmGl+ErB4KkI+2I0ANgM5RQEfS+i9mguWI/GR6?= =?us-ascii?Q?WfPFvvr5ljJ3STQGnkNNxyXK1IMD4F9fsM2qEpPAgl7D3rUls+6njRTxnjhv?= =?us-ascii?Q?msqRVmAfGrhNVdiUtRmp4aXTH/CS+S8l4YT5PhOvdw0KmP/k/i0uQgVS89T5?= =?us-ascii?Q?XOhBJZZRWAM8AK0Ve9cVrEq+T/gtiJKJ1foBBdLw+Jeju+IjtmPkj/RvffAs?= =?us-ascii?Q?aUG0lG8ivvxP4K0F9pMbTzvfhbrLYPfnX8rb7+F/nxJmHuoWmSvhKu+1Gtuf?= =?us-ascii?Q?ubRyW5QLeJBdsWAo0DT/96T8WJLqT9RvOLnA2kpDDingoeAmPpyETOdlxa9s?= =?us-ascii?Q?6ZR0P2RSIp9HngqOAa/pS86dxV0MYSg/4rPo9rpDKTSnqCJIHniMAa/62oT5?= =?us-ascii?Q?qJTZOBnAJXkQPtgEs2uZFcfoxWAu67hSDF2Z1dVHQtTwN00uLPeJasvW6r4F?= =?us-ascii?Q?DxudsVCaHNneAhhkZTtDsAyc6c0ASt49a5U8vb8WiC2GZOt3Vy+vOq+9YRZM?= =?us-ascii?Q?Pg7UM+eEOiNIfBN2AdgunbwE7oFdCchg72lv77afcz4mj3eEMB9cOVsQ1ska?= =?us-ascii?Q?8kZxP+aGRbRlxZ348jAY0P19k31rd2rcsoumEXe++dhay2TvBDMQa1w6fDv0?= =?us-ascii?Q?oIjRrqUhH+WywOdSAn8hbcvcxHmvahO4TmWgKkEvh2VG9gzEhR6yiuUPs07d?= =?us-ascii?Q?DraII3NOf7YGXA01aWHV06WKoO07YbXf4cMlul78ZwW3pg9VpmPZ0tZfLeO/?= =?us-ascii?Q?uJZXmgmsqI9K7Lh4dyPx51jBpIB6S/RdbngYpB8qMyIJNq0rB6/M5ob42Ig1?= =?us-ascii?Q?c9uHtm0lMtXyeNqhqKx0Zu0ezlvTszVyVQmfjx6gXtaJzUvzLrUZcL9+XGrR?= =?us-ascii?Q?aukE46AqJOzYLlTmSDYoErMWhu9vnf17WYWyaBjIhFml+ts4e2+6PlvPezPn?= =?us-ascii?Q?VHIPRK0p2E9TD1WVpBNInwxyqVcpkBVUr+xNMJFVMYUlrO/ny8szBnQS22aN?= =?us-ascii?Q?wuu6b+Ng8v00GMEJQcSOmqbI5RDkHHW49KI3ZMWudqWZZ/Q6F6t2mMAC9duN?= =?us-ascii?Q?RNYDJRwdij8fK7NqBLNKPbAZGZpYwDxsFktEJlzyqI+soAkbFCeCOtqmRWy9?= =?us-ascii?Q?cNG4/ZuDZWmGZPlaI2ieUW5cvRSdXNV+hNU+ZlnEMYSecvnTCus9qVJWk0iR?= =?us-ascii?Q?vNcyv+GbESzVbN/dIoA3nRpeJmyQ5labJ2/NoztDrl3YZIfg8NhBFPOvwgC8?= =?us-ascii?Q?I1ZjenzpFcDTCUBGlxE=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(7416014)(36860700013)(1800799024)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jan 2026 11:47:30.8085 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e6713d01-9922-458e-4629-08de503e0960 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF000397B4.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4049 Content-Type: text/plain; charset="utf-8" A region is always bound to a root decoder. The region's associated root decoder is often needed. Add it to struct cxl_region. This simplifies the code by removing dynamic lookups and the root decoder argument from the function argument list where possible. Patch is a prerequisite to implement address translation which uses struct cxl_region to store all relevant region and interleaving parameters. It changes the argument list of __construct_region() in preparation of adding a context argument. Additionally the arg list of cxl_region_attach_position() is simplified and the use of to_cxl_root_decoder() removed, which always reconstructs and checks the pointer. The pointer never changes and is frequently used. Code becomes more readable as this amphazises the binding between both objects. Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Reviewed-by: Gregory Price Signed-off-by: Robert Richter Reviewed-by: Alison Schofield --- drivers/cxl/core/region.c | 37 +++++++++++++++++++------------------ drivers/cxl/cxl.h | 2 ++ 2 files changed, 21 insertions(+), 18 deletions(-) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index 51f1a5545324..22bd8ff37cef 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -489,9 +489,9 @@ static ssize_t interleave_ways_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { - struct cxl_root_decoder *cxlrd =3D to_cxl_root_decoder(dev->parent); - struct cxl_decoder *cxld =3D &cxlrd->cxlsd.cxld; struct cxl_region *cxlr =3D to_cxl_region(dev); + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; + struct cxl_decoder *cxld =3D &cxlrd->cxlsd.cxld; struct cxl_region_params *p =3D &cxlr->params; unsigned int val, save; int rc; @@ -552,9 +552,9 @@ static ssize_t interleave_granularity_store(struct devi= ce *dev, struct device_attribute *attr, const char *buf, size_t len) { - struct cxl_root_decoder *cxlrd =3D to_cxl_root_decoder(dev->parent); - struct cxl_decoder *cxld =3D &cxlrd->cxlsd.cxld; struct cxl_region *cxlr =3D to_cxl_region(dev); + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; + struct cxl_decoder *cxld =3D &cxlrd->cxlsd.cxld; struct cxl_region_params *p =3D &cxlr->params; int rc, val; u16 ig; @@ -628,7 +628,7 @@ static DEVICE_ATTR_RO(mode); =20 static int alloc_hpa(struct cxl_region *cxlr, resource_size_t size) { - struct cxl_root_decoder *cxlrd =3D to_cxl_root_decoder(cxlr->dev.parent); + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; struct cxl_region_params *p =3D &cxlr->params; struct resource *res; u64 remainder =3D 0; @@ -1373,7 +1373,7 @@ static int cxl_port_setup_targets(struct cxl_port *po= rt, struct cxl_region *cxlr, struct cxl_endpoint_decoder *cxled) { - struct cxl_root_decoder *cxlrd =3D to_cxl_root_decoder(cxlr->dev.parent); + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; int parent_iw, parent_ig, ig, iw, rc, pos =3D cxled->pos; struct cxl_port *parent_port =3D to_cxl_port(port->dev.parent); struct cxl_region_ref *cxl_rr =3D cxl_rr_load(port, cxlr); @@ -1731,10 +1731,10 @@ static int cxl_region_validate_position(struct cxl_= region *cxlr, } =20 static int cxl_region_attach_position(struct cxl_region *cxlr, - struct cxl_root_decoder *cxlrd, struct cxl_endpoint_decoder *cxled, const struct cxl_dport *dport, int pos) { + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; struct cxl_memdev *cxlmd =3D cxled_to_memdev(cxled); struct cxl_switch_decoder *cxlsd =3D &cxlrd->cxlsd; struct cxl_decoder *cxld =3D &cxlsd->cxld; @@ -1971,7 +1971,7 @@ static int cxl_region_sort_targets(struct cxl_region = *cxlr) static int cxl_region_attach(struct cxl_region *cxlr, struct cxl_endpoint_decoder *cxled, int pos) { - struct cxl_root_decoder *cxlrd =3D to_cxl_root_decoder(cxlr->dev.parent); + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; struct cxl_memdev *cxlmd =3D cxled_to_memdev(cxled); struct cxl_dev_state *cxlds =3D cxlmd->cxlds; struct cxl_region_params *p =3D &cxlr->params; @@ -2076,8 +2076,7 @@ static int cxl_region_attach(struct cxl_region *cxlr, ep_port =3D cxled_to_port(cxled); dport =3D cxl_find_dport_by_dev(root_port, ep_port->host_bridge); - rc =3D cxl_region_attach_position(cxlr, cxlrd, cxled, - dport, i); + rc =3D cxl_region_attach_position(cxlr, cxled, dport, i); if (rc) return rc; } @@ -2100,7 +2099,7 @@ static int cxl_region_attach(struct cxl_region *cxlr, if (rc) return rc; =20 - rc =3D cxl_region_attach_position(cxlr, cxlrd, cxled, dport, pos); + rc =3D cxl_region_attach_position(cxlr, cxled, dport, pos); if (rc) return rc; =20 @@ -2396,8 +2395,8 @@ static const struct attribute_group *region_groups[] = =3D { =20 static void cxl_region_release(struct device *dev) { - struct cxl_root_decoder *cxlrd =3D to_cxl_root_decoder(dev->parent); struct cxl_region *cxlr =3D to_cxl_region(dev); + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; int id =3D atomic_read(&cxlrd->region_id); =20 /* @@ -2480,10 +2479,12 @@ static struct cxl_region *cxl_region_alloc(struct c= xl_root_decoder *cxlrd, int i * region id allocations */ get_device(dev->parent); + cxlr->cxlrd =3D cxlrd; + cxlr->id =3D id; + device_set_pm_not_required(dev); dev->bus =3D &cxl_bus_type; dev->type =3D &cxl_region_type; - cxlr->id =3D id; cxl_region_set_lock(cxlr, &cxlrd->cxlsd.cxld); =20 return cxlr; @@ -3115,7 +3116,7 @@ EXPORT_SYMBOL_FOR_MODULES(cxl_calculate_hpa_offset, "= cxl_translate"); u64 cxl_dpa_to_hpa(struct cxl_region *cxlr, const struct cxl_memdev *cxlmd, u64 dpa) { - struct cxl_root_decoder *cxlrd =3D to_cxl_root_decoder(cxlr->dev.parent); + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; struct cxl_region_params *p =3D &cxlr->params; struct cxl_endpoint_decoder *cxled =3D NULL; u64 dpa_offset, hpa_offset, hpa; @@ -3168,7 +3169,7 @@ static int region_offset_to_dpa_result(struct cxl_reg= ion *cxlr, u64 offset, struct dpa_result *result) { struct cxl_region_params *p =3D &cxlr->params; - struct cxl_root_decoder *cxlrd =3D to_cxl_root_decoder(cxlr->dev.parent); + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; struct cxl_endpoint_decoder *cxled; u64 hpa, hpa_offset, dpa_offset; u16 eig =3D 0; @@ -3522,7 +3523,7 @@ static int match_region_by_range(struct device *dev, = const void *data) static int cxl_extended_linear_cache_resize(struct cxl_region *cxlr, struct resource *res) { - struct cxl_root_decoder *cxlrd =3D to_cxl_root_decoder(cxlr->dev.parent); + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; struct cxl_region_params *p =3D &cxlr->params; resource_size_t size =3D resource_size(res); resource_size_t cache_size, start; @@ -3558,9 +3559,9 @@ static int cxl_extended_linear_cache_resize(struct cx= l_region *cxlr, } =20 static int __construct_region(struct cxl_region *cxlr, - struct cxl_root_decoder *cxlrd, struct cxl_endpoint_decoder *cxled) { + struct cxl_root_decoder *cxlrd =3D cxlr->cxlrd; struct cxl_memdev *cxlmd =3D cxled_to_memdev(cxled); struct range *hpa_range =3D &cxled->cxld.hpa_range; struct cxl_region_params *p; @@ -3656,7 +3657,7 @@ static struct cxl_region *construct_region(struct cxl= _root_decoder *cxlrd, return cxlr; } =20 - rc =3D __construct_region(cxlr, cxlrd, cxled); + rc =3D __construct_region(cxlr, cxled); if (rc) { devm_release_action(port->uport_dev, unregister_region, cxlr); return ERR_PTR(rc); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index ba17fa86d249..10ce9c3a8a55 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -529,6 +529,7 @@ enum cxl_partition_mode { * struct cxl_region - CXL region * @dev: This region's device * @id: This region's id. Id is globally unique across all regions + * @cxlrd: Region's root decoder * @mode: Operational mode of the mapped capacity * @type: Endpoint decoder target type * @cxl_nvb: nvdimm bridge for coordinating @cxlr_pmem setup / shutdown @@ -542,6 +543,7 @@ enum cxl_partition_mode { struct cxl_region { struct device dev; int id; + struct cxl_root_decoder *cxlrd; enum cxl_partition_mode mode; enum cxl_decoder_type type; struct cxl_nvdimm_bridge *cxl_nvb; --=20 2.47.3