tools/testing/cxl: Introduce a mock memory device + driver

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Introduce an emulated device-set plus driver to register CXL memory
devices, 'struct cxl_memdev' instances, in the mock cxl_test topology.
This enables the development of HDM Decoder (Host-managed Device Memory
Decoder) programming flow (region provisioning) in an environment that
can be updated alongside the kernel as it gains more functionality.

Whereas the cxl_pci module looks for CXL memory expanders on the 'pci'
bus, the cxl_mock_mem module attaches to CXL expanders on the platform
bus emitted by cxl_test.

Acked-by: Ben Widawsky <ben.widawsky@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/163116440099.2460985.10692549614409346604.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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This commit is contained in:

Dan Williams 2021-09-08 22:13:21 -07:00

parent 49be6dd807

commit 7d3eb23c4c

8 changed files with 359 additions and 6 deletions

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6

drivers/cxl/core/pmem.c

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2

drivers/cxl/cxl.h

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drivers/cxl/pmem.c

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tools/testing/cxl/Kbuild

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tools/testing/cxl/mock_pmem.c

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tools/testing/cxl/test/Kbuild

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tools/testing/cxl/test/cxl.c

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tools/testing/cxl/test/mem.c

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