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cxl/region: Introduce cxl_pmem_region objects

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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>
This commit is contained in:
Dan Williams
2022-01-11 08:06:40 -08:00
parent 99183d26ed
commit 04ad63f086
8 changed files with 446 additions and 12 deletions
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5
include/linux/libnvdimm.h
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@@ -59,6 +59,9 @@ enum {
/* Platform provides asynchronous flush mechanism */
ND_REGION_ASYNC = 3,
/* Region was created by CXL subsystem */
ND_REGION_CXL = 4,
/* mark newly adjusted resources as requiring a label update */
DPA_RESOURCE_ADJUSTED = 1 << 0,
};
@@ -122,6 +125,7 @@ struct nd_region_desc {
int numa_node;
int target_node;
unsigned long flags;
int memregion;
struct device_node *of_node;
int (*flush)(struct nd_region *nd_region, struct bio *bio);
};
@@ -259,6 +263,7 @@ static inline struct nvdimm *nvdimm_create(struct nvdimm_bus *nvdimm_bus,
cmd_mask, num_flush, flush_wpq, NULL, NULL, NULL);
}
void nvdimm_delete(struct nvdimm *nvdimm);
void nvdimm_region_delete(struct nd_region *nd_region);
const struct nd_cmd_desc *nd_cmd_dimm_desc(int cmd);
const struct nd_cmd_desc *nd_cmd_bus_desc(int cmd);