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| author | Dan Williams <dan.j.williams@intel.com> | 2022-01-11 19:06:40 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-07-26 22:23:01 +0300 |
| commit | 04ad63f086d1a9649b8b082748cbc7a570ade461 (patch) | |
| tree | b9bfa0e0a44ce367490fbabe100a0ccde8960fc3 /drivers/cxl/cxl.h | |
| parent | 99183d26ed6191010fca09518dae34d6aff3cd14 (diff) | |
| download | linux-04ad63f086d1a9649b8b082748cbc7a570ade461.tar.xz | |
cxl/region: Introduce cxl_pmem_region objects
The LIBNVDIMM subsystem is a platform agnostic representation of system
NVDIMM / persistent memory resources. To date, the CXL subsystem's
interaction with LIBNVDIMM has been to register an nvdimm-bridge device
and cxl_nvdimm objects to proxy CXL capabilities into existing LIBNVDIMM
subsystem mechanics.
With regions the approach is the same. Create a new cxl_pmem_region
object to proxy CXL region details into a LIBNVDIMM definition. With
this enabling LIBNVDIMM can partition CXL persistent memory regions with
legacy namespace labels. A follow-on patch will add CXL region label and
CXL namespace label support to persist region configurations across
driver reload / system-reset events.
Co-developed-by: Ben Widawsky <bwidawsk@kernel.org>
Signed-off-by: Ben Widawsky <bwidawsk@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165784340111.1758207.3036498385188290968.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/cxl.h')
| -rw-r--r-- | drivers/cxl/cxl.h | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 46d3f173a700..75674400cc8d 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -419,6 +419,25 @@ struct cxl_nvdimm { struct device dev; struct cxl_memdev *cxlmd; struct cxl_nvdimm_bridge *bridge; + struct cxl_pmem_region *region; +}; + +struct cxl_pmem_region_mapping { + struct cxl_memdev *cxlmd; + struct cxl_nvdimm *cxl_nvd; + u64 start; + u64 size; + int position; +}; + +struct cxl_pmem_region { + struct device dev; + struct cxl_region *cxlr; + struct nd_region *nd_region; + struct cxl_nvdimm_bridge *bridge; + struct range hpa_range; + int nr_mappings; + struct cxl_pmem_region_mapping mapping[]; }; /** @@ -601,6 +620,7 @@ void cxl_driver_unregister(struct cxl_driver *cxl_drv); #define CXL_DEVICE_ROOT 4 #define CXL_DEVICE_MEMORY_EXPANDER 5 #define CXL_DEVICE_REGION 6 +#define CXL_DEVICE_PMEM_REGION 7 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*") #define CXL_MODALIAS_FMT "cxl:t%d" @@ -612,7 +632,21 @@ struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev); bool is_cxl_nvdimm(struct device *dev); bool is_cxl_nvdimm_bridge(struct device *dev); int devm_cxl_add_nvdimm(struct device *host, struct cxl_memdev *cxlmd); -struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct cxl_nvdimm *cxl_nvd); +struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct device *dev); + +#ifdef CONFIG_CXL_REGION +bool is_cxl_pmem_region(struct device *dev); +struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev); +#else +static inline bool is_cxl_pmem_region(struct device *dev) +{ + return false; +} +static inline struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev) +{ + return NULL; +} +#endif /* * Unit test builds overrides this to __weak, find the 'strong' version |