cxl/mbox: Initialize the poison state

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Driver reads of the poison list are synchronized to ensure that a
reader does not get an incomplete list because their request
overlapped (was interrupted or preceded by) another read request
of the same DPA range. (CXL Spec 3.0 Section 8.2.9.8.4.1). The
driver maintains state information to achieve this goal.

To initialize the state, first recognize the poison commands in
the CEL (Command Effects Log). If the device supports Get Poison
List, allocate a single buffer for the poison list and protect it
with a lock.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Link: https://lore.kernel.org/r/9078d180769be28a5087288b38cdfc827cae58bf.1681838291.git.alison.schofield@intel.com
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

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Alison Schofield 2023-04-18 10:39:03 -07:00 • committed by Dan Williams

parent dec441d32a

commit d0abf5787a

3 changed files with 117 additions and 2 deletions

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81

drivers/cxl/core/mbox.c

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34

drivers/cxl/cxlmem.h

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4

drivers/cxl/pci.c

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