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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jun 2025 14:14:23.0252 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 25960905-4578-44a5-5acf-08ddb3296b4b 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CE9.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8765 From: Alejandro Lucero Type3 relies on mailbox CXL_MBOX_OP_IDENTIFY command for initializing memdev state params which end up being used for DPA initialization. Allow a Type2 driver to initialize DPA simply by giving the size of its volatile hardware partition. Signed-off-by: Alejandro Lucero ยบ --- drivers/cxl/core/mbox.c | 17 +++++++++++++++++ include/cxl/cxl.h | 1 + 2 files changed, 18 insertions(+) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index d78f6039f997..d3b4ba5214d5 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -1284,6 +1284,23 @@ static void add_part(struct cxl_dpa_info *info, u64 start, u64 size, enum cxl_pa info->nr_partitions++; } +/** + * cxl_set_capacity: initialize dpa by a driver without a mailbox. + * + * @cxlds: pointer to cxl_dev_state + * @capacity: device volatile memory size + */ +void cxl_set_capacity(struct cxl_dev_state *cxlds, u64 capacity) +{ + struct cxl_dpa_info range_info = { + .size = capacity, + }; + + add_part(&range_info, 0, capacity, CXL_PARTMODE_RAM); + cxl_dpa_setup(cxlds, &range_info); +} +EXPORT_SYMBOL_NS_GPL(cxl_set_capacity, "CXL"); + int cxl_mem_dpa_fetch(struct cxl_memdev_state *mds, struct cxl_dpa_info *info) { struct cxl_dev_state *cxlds = &mds->cxlds; diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h index 0810c18d7aef..4975ead488b4 100644 --- a/include/cxl/cxl.h +++ b/include/cxl/cxl.h @@ -231,4 +231,5 @@ struct cxl_dev_state *_devm_cxl_dev_state_create(struct device *dev, int cxl_map_component_regs(const struct cxl_register_map *map, struct cxl_component_regs *regs, unsigned long map_mask); +void cxl_set_capacity(struct cxl_dev_state *cxlds, u64 capacity); #endif /* __CXL_CXL_H__ */ -- 2.34.1