diff options
| -rw-r--r-- | Documentation/driver-api/cxl/memory-devices.rst | 2 | ||||
| -rw-r--r-- | drivers/cxl/core/pmem.c | 30 |
2 files changed, 29 insertions, 3 deletions
diff --git a/Documentation/driver-api/cxl/memory-devices.rst b/Documentation/driver-api/cxl/memory-devices.rst index 46847d8c70a0..df799cdf1c3f 100644 --- a/Documentation/driver-api/cxl/memory-devices.rst +++ b/Documentation/driver-api/cxl/memory-devices.rst @@ -40,7 +40,7 @@ CXL Core :doc: cxl core .. kernel-doc:: drivers/cxl/core/pmem.c - :internal: + :doc: cxl pmem .. kernel-doc:: drivers/cxl/core/regs.c :internal: diff --git a/drivers/cxl/core/pmem.c b/drivers/cxl/core/pmem.c index 69c97cc0d945..d24570f5b8ba 100644 --- a/drivers/cxl/core/pmem.c +++ b/drivers/cxl/core/pmem.c @@ -1,13 +1,25 @@ // SPDX-License-Identifier: GPL-2.0-only /* Copyright(c) 2020 Intel Corporation. */ - #include <linux/device.h> #include <linux/slab.h> #include <cxlmem.h> #include <cxl.h> - #include "core.h" +/** + * DOC: cxl pmem + * + * The core CXL PMEM infrastructure supports persistent memory + * provisioning and serves as a bridge to the LIBNVDIMM subsystem. A CXL + * 'bridge' device is added at the root of a CXL device topology if + * platform firmware advertises at least one persistent memory capable + * CXL window. That root-level bridge corresponds to a LIBNVDIMM 'bus' + * device. Then for each cxl_memdev in the CXL device topology a bridge + * device is added to host a LIBNVDIMM dimm object. When these bridges + * are registered native LIBNVDIMM uapis are translated to CXL + * operations, for example, namespace label access commands. + */ + static void cxl_nvdimm_bridge_release(struct device *dev) { struct cxl_nvdimm_bridge *cxl_nvb = to_cxl_nvdimm_bridge(dev); @@ -85,6 +97,13 @@ static void unregister_nvb(void *_cxl_nvb) device_unregister(&cxl_nvb->dev); } +/** + * devm_cxl_add_nvdimm_bridge() - add the root of a LIBNVDIMM topology + * @host: platform firmware root device + * @port: CXL port at the root of a CXL topology + * + * Return: bridge device that can host cxl_nvdimm objects + */ struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host, struct cxl_port *port) { @@ -173,6 +192,13 @@ static struct cxl_nvdimm *cxl_nvdimm_alloc(struct cxl_memdev *cxlmd) return cxl_nvd; } +/** + * devm_cxl_add_nvdimm() - add a bridge between a cxl_memdev and an nvdimm + * @host: same host as @cxlmd + * @cxlmd: cxl_memdev instance that will perform LIBNVDIMM operations + * + * Return: 0 on success negative error code on failure. + */ int devm_cxl_add_nvdimm(struct device *host, struct cxl_memdev *cxlmd) { struct cxl_nvdimm *cxl_nvd; |