cxl/pci: Add (hopeful) error handling support

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Add nominal error handling that tears down CXL.mem in response to error
notifications that imply a device reset. Given some CXL.mem may be
operating as System RAM, there is a high likelihood that these error
events are fatal. However, if the system survives the notification the
expectation is that the driver behavior is equivalent to a hot-unplug
and re-plug of an endpoint.

Note that this does not change the mask values from the default. That
awaits CXL _OSC support to determine whether platform firmware is in
control of the mask registers.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/166974413966.1608150.15522782911404473932.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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This commit is contained in:

Dan Williams 2022-11-29 10:48:59 -07:00

parent 2f6e9c3051

commit 2905cb5236

4 changed files with 141 additions and 0 deletions

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1

drivers/cxl/core/memdev.c

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1

drivers/cxl/cxl.h

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2

drivers/cxl/cxlmem.h

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137

drivers/cxl/pci.c

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