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| author | Dan Williams <dan.j.williams@intel.com> | 2022-05-23 12:15:35 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-07-21 17:19:23 -0700 |
| commit | 2c8669033f16f5d791e10a5bdd42e39c7380da57 (patch) | |
| tree | 56607c894bdaf54da1f0d7a197263f8879e33a8e /drivers/cxl/cxl.h | |
| parent | 9c57cde0dcbd0f76f649d152b83a2b9316277b22 (diff) | |
| download | linux-2c8669033f16f5d791e10a5bdd42e39c7380da57.tar.bz2 | |
cxl/hdm: Add 'mode' attribute to decoder objects
Recall that the Device Physical Address (DPA) space of a CXL Memory
Expander is potentially partitioned into a volatile and persistent
portion. A decoder maps a Host Physical Address (HPA) range to a DPA
range and that translation depends on the value of all previous (lower
instance number) decoders before the current one.
In preparation for allowing dynamic provisioning of regions, decoders
need an ABI to indicate which DPA partition a decoder targets. This ABI
needs to be prepared for the possibility that some other agent committed
and locked a decoder that spans the partition boundary.
Add 'decoderX.Y/mode' to endpoint decoders that indicates which
partition 'ram' / 'pmem' the decoder targets, or 'mixed' if the decoder
currently spans the partition boundary.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165603881967.551046.6007594190951596439.stgit@dwillia2-xfh
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/cxl.h')
| -rw-r--r-- | drivers/cxl/cxl.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 5fe8b59a0b18..afaa76f065f9 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -241,16 +241,25 @@ struct cxl_decoder { unsigned long flags; }; +enum cxl_decoder_mode { + CXL_DECODER_NONE, + CXL_DECODER_RAM, + CXL_DECODER_PMEM, + CXL_DECODER_MIXED, +}; + /** * struct cxl_endpoint_decoder - Endpoint / SPA to DPA decoder * @cxld: base cxl_decoder_object * @dpa_res: actively claimed DPA span of this decoder * @skip: offset into @dpa_res where @cxld.hpa_range maps + * @mode: which memory type / access-mode-partition this decoder targets */ struct cxl_endpoint_decoder { struct cxl_decoder cxld; struct resource *dpa_res; resource_size_t skip; + enum cxl_decoder_mode mode; }; /** |