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client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C Received: from SATLEXMB03.amd.com (165.204.84.17) by SA2PEPF00003AE8.mail.protection.outlook.com (10.167.248.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8880.14 via Frontend Transport; Tue, 24 Jun 2025 14:14:45 +0000 Received: from SATLEXMB03.amd.com (10.181.40.144) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Tue, 24 Jun 2025 09:14:41 -0500 Received: from xcbalucerop40x.xilinx.com (10.180.168.240) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39 via Frontend Transport; Tue, 24 Jun 2025 09:14:40 -0500 From: To: , , , , , , , , CC: Alejandro Lucero , Jonathan Cameron Subject: [PATCH v17 18/22] cxl: Allow region creation by type2 drivers Date: Tue, 24 Jun 2025 15:13:51 +0100 Message-ID: <20250624141355.269056-19-alejandro.lucero-palau@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250624141355.269056-1-alejandro.lucero-palau@amd.com> References: <20250624141355.269056-1-alejandro.lucero-palau@amd.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Received-SPF: None (SATLEXMB03.amd.com: alejandro.lucero-palau@amd.com does not designate permitted sender hosts) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF00003AE8:EE_|CH3PR12MB9145:EE_ X-MS-Office365-Filtering-Correlation-Id: 2c3e9634-d046-4134-aa1e-08ddb329785c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|376014; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jun 2025 14:14:45.0173 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2c3e9634-d046-4134-aa1e-08ddb329785c 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=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00003AE8.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9145 From: Alejandro Lucero Creating a CXL region requires userspace intervention through the cxl sysfs files. Type2 support should allow accelerator drivers to create such cxl region from kernel code. Adding that functionality and integrating it with current support for memory expanders. Support an action by the type2 driver to be linked to the created region for unwinding the resources allocated properly. Based on https://lore.kernel.org/linux-cxl/168592159835.1948938.1647215579839222774.stgit@dwillia2-xfh.jf.intel.com/ Signed-off-by: Alejandro Lucero Reviewed-by: Jonathan Cameron --- drivers/cxl/core/region.c | 152 ++++++++++++++++++++++++++++++++++++-- drivers/cxl/port.c | 5 +- include/cxl/cxl.h | 5 ++ 3 files changed, 153 insertions(+), 9 deletions(-) diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index 21cf8c11efe3..4ca5ade54ad9 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -2319,6 +2319,12 @@ static int cxl_region_detach(struct cxl_endpoint_decoder *cxled) return rc; } +/** + * cxl_decoder_kill_region - detach a region from device + * + * @cxled: endpoint decoder to detach the region from. + * + */ void cxl_decoder_kill_region(struct cxl_endpoint_decoder *cxled) { down_write(&cxl_region_rwsem); @@ -2326,6 +2332,7 @@ void cxl_decoder_kill_region(struct cxl_endpoint_decoder *cxled) cxl_region_detach(cxled); up_write(&cxl_region_rwsem); } +EXPORT_SYMBOL_NS_GPL(cxl_decoder_kill_region, "CXL"); static int attach_target(struct cxl_region *cxlr, struct cxl_endpoint_decoder *cxled, int pos, @@ -2825,6 +2832,14 @@ cxl_find_region_by_name(struct cxl_root_decoder *cxlrd, const char *name) return to_cxl_region(region_dev); } +static void drop_region(struct cxl_region *cxlr) +{ + struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(cxlr->dev.parent); + struct cxl_port *port = cxlrd_to_port(cxlrd); + + devm_release_action(port->uport_dev, unregister_region, cxlr); +} + static ssize_t delete_region_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) @@ -3529,14 +3544,12 @@ static int __construct_region(struct cxl_region *cxlr, return 0; } -/* Establish an empty region covering the given HPA range */ -static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd, - struct cxl_endpoint_decoder *cxled) +static struct cxl_region *construct_region_begin(struct cxl_root_decoder *cxlrd, + struct cxl_endpoint_decoder *cxled) { struct cxl_memdev *cxlmd = cxled_to_memdev(cxled); - struct cxl_port *port = cxlrd_to_port(cxlrd); struct cxl_dev_state *cxlds = cxlmd->cxlds; - int rc, part = READ_ONCE(cxled->part); + int part = READ_ONCE(cxled->part); struct cxl_region *cxlr; do { @@ -3545,13 +3558,24 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd, cxled->cxld.target_type); } while (IS_ERR(cxlr) && PTR_ERR(cxlr) == -EBUSY); - if (IS_ERR(cxlr)) { + if (IS_ERR(cxlr)) dev_err(cxlmd->dev.parent, "%s:%s: %s failed assign region: %ld\n", dev_name(&cxlmd->dev), dev_name(&cxled->cxld.dev), __func__, PTR_ERR(cxlr)); - return cxlr; - } + + return cxlr; +} + +/* Establish an empty region covering the given HPA range */ +static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd, + struct cxl_endpoint_decoder *cxled) +{ + struct cxl_port *port = cxlrd_to_port(cxlrd); + struct cxl_region *cxlr; + int rc; + + cxlr = construct_region_begin(cxlrd, cxled); rc = __construct_region(cxlr, cxlrd, cxled); if (rc) { @@ -3562,6 +3586,118 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd, return cxlr; } +static struct cxl_region * +__construct_new_region(struct cxl_root_decoder *cxlrd, + struct cxl_endpoint_decoder **cxled, int ways) +{ + struct cxl_memdev *cxlmd = cxled_to_memdev(cxled[0]); + struct cxl_decoder *cxld = &cxlrd->cxlsd.cxld; + struct cxl_region_params *p; + resource_size_t size = 0; + struct cxl_region *cxlr; + int rc, i; + + cxlr = construct_region_begin(cxlrd, cxled[0]); + if (IS_ERR(cxlr)) + return cxlr; + + guard(rwsem_write)(&cxl_region_rwsem); + + /* + * Sanity check. This should not happen with an accel driver handling + * the region creation. + */ + p = &cxlr->params; + if (p->state >= CXL_CONFIG_INTERLEAVE_ACTIVE) { + dev_err(cxlmd->dev.parent, + "%s:%s: %s unexpected region state\n", + dev_name(&cxlmd->dev), dev_name(&cxled[0]->cxld.dev), + __func__); + rc = -EBUSY; + goto err; + } + + rc = set_interleave_ways(cxlr, ways); + if (rc) + goto err; + + rc = set_interleave_granularity(cxlr, cxld->interleave_granularity); + if (rc) + goto err; + + scoped_guard(rwsem_read, &cxl_dpa_rwsem) { + for (i = 0; i < ways; i++) { + if (!cxled[i]->dpa_res) + break; + size += resource_size(cxled[i]->dpa_res); + } + } + + if (i < ways) + goto err; + + rc = alloc_hpa(cxlr, size); + if (rc) + goto err; + + scoped_guard(rwsem_read, &cxl_dpa_rwsem) { + for (i = 0; i < ways; i++) { + rc = cxl_region_attach(cxlr, cxled[i], 0); + if (rc) + goto err; + } + } + + if (rc) + goto err; + + rc = cxl_region_decode_commit(cxlr); + if (rc) + goto err; + + p->state = CXL_CONFIG_COMMIT; + + return cxlr; +err: + drop_region(cxlr); + return ERR_PTR(rc); +} + +/** + * cxl_create_region - Establish a region given an endpoint decoder + * @cxlrd: root decoder to allocate HPA + * @cxled: endpoint decoder with reserved DPA capacity + * @ways: interleave ways required + * + * Returns a fully formed region in the commit state and attached to the + * cxl_region driver. + */ +struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, + struct cxl_endpoint_decoder **cxled, + int ways, void (*action)(void *), + void *data) +{ + struct cxl_region *cxlr; + + scoped_guard(mutex, &cxlrd->range_lock) { + cxlr = __construct_new_region(cxlrd, cxled, ways); + if (IS_ERR(cxlr)) + return cxlr; + } + + if (device_attach(&cxlr->dev) <= 0) { + dev_err(&cxlr->dev, "failed to create region\n"); + drop_region(cxlr); + return ERR_PTR(-ENODEV); + } + + if (action) + devm_add_action_or_reset(&cxlr->dev, action, data); + + return cxlr; +} +EXPORT_SYMBOL_NS_GPL(cxl_create_region, "CXL"); + int cxl_add_to_region(struct cxl_port *root, struct cxl_endpoint_decoder *cxled) { struct cxl_memdev *cxlmd = cxled_to_memdev(cxled); diff --git a/drivers/cxl/port.c b/drivers/cxl/port.c index a35fc5552845..69b8d8344029 100644 --- a/drivers/cxl/port.c +++ b/drivers/cxl/port.c @@ -33,6 +33,7 @@ static void schedule_detach(void *cxlmd) static int discover_region(struct device *dev, void *root) { struct cxl_endpoint_decoder *cxled; + struct cxl_memdev *cxlmd; int rc; if (!is_endpoint_decoder(dev)) @@ -42,7 +43,9 @@ static int discover_region(struct device *dev, void *root) if ((cxled->cxld.flags & CXL_DECODER_F_ENABLE) == 0) return 0; - if (cxled->state != CXL_DECODER_STATE_AUTO) + cxlmd = cxled_to_memdev(cxled); + if (cxled->state != CXL_DECODER_STATE_AUTO || + cxlmd->cxlds->type == CXL_DEVTYPE_DEVMEM) return 0; /* diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h index a2f3e683724a..5067f71143ef 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -252,4 +252,9 @@ struct cxl_endpoint_decoder *cxl_request_dpa(struct cxl_memdev *cxlmd, enum cxl_partition_mode mode, resource_size_t alloc); int cxl_dpa_free(struct cxl_endpoint_decoder *cxled); +struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd, + struct cxl_endpoint_decoder **cxled, + int ways, void (*action)(void *), + void *data); +void cxl_decoder_kill_region(struct cxl_endpoint_decoder *cxled); #endif /* __CXL_CXL_H__ */ -- 2.34.1