cxl/hdm: Create emulated cxl_hdm for devices that do not have HDM decoders

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CXL rev3 spec 8.1.3

RCDs may not have HDM register blocks. Create a fake HDM with information
from the CXL PCIe DVSEC registers. The decoder count will be set to the
HDM count retrieved from the DVSEC cap register.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/167640368994.935665.15831225724059704620.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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This commit is contained in:

Dave Jiang 2023-02-14 11:41:30 -08:00 • committed by Dan Williams

parent b777e9bec9

commit 4474ce565e

7 changed files with 66 additions and 20 deletions

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58

drivers/cxl/core/hdm.c

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9

drivers/cxl/core/pci.c

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3

drivers/cxl/cxl.h

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2

drivers/cxl/port.c

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3

tools/testing/cxl/test/cxl.c

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8

tools/testing/cxl/test/mock.c

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3

tools/testing/cxl/test/mock.h

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