linux

iv/linux

History

Robert Richter 0312171289 cxl/pci: Fix disabling memory if DVSEC CXL Range does not match a CFMWS window

commit 0cab687205986491302cd2e440ef1d253031c221 upstream.

The Linux CXL subsystem is built on the assumption that HPA == SPA.
That is, the host physical address (HPA) the HDM decoder registers are
programmed with are system physical addresses (SPA).

During HDM decoder setup, the DVSEC CXL range registers (cxl-3.1,
8.1.3.8) are checked if the memory is enabled and the CXL range is in
a HPA window that is described in a CFMWS structure of the CXL host
bridge (cxl-3.1, 9.18.1.3).

Now, if the HPA is not an SPA, the CXL range does not match a CFMWS
window and the CXL memory range will be disabled then. The HDM decoder
stops working which causes system memory being disabled and further a
system hang during HDM decoder initialization, typically when a CXL
enabled kernel boots.

Prevent a system hang and do not disable the HDM decoder if the
decoder's CXL range is not found in a CFMWS window.

Note the change only fixes a hardware hang, but does not implement
HPA/SPA translation. Support for this can be added in a follow on
patch series.

Signed-off-by: Robert Richter <rrichter@amd.com>
Fixes: 34e37b4c432c ("cxl/port: Enable HDM Capability after validating DVSEC Ranges")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20240216160113.407141-1-rrichter@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2024-03-01 13:26:31 +01:00

core

cxl/pci: Fix disabling memory if DVSEC CXL Range does not match a CFMWS window

2024-03-01 13:26:31 +01:00

acpi.c

cxl: Unify debug messages when calling devm_cxl_add_port()

2023-11-28 17:07:17 +00:00

cxl.h

tools/testing/cxl: Define a fixed volatile configuration to parse

2023-11-28 17:07:17 +00:00

cxlmem.h

tools/testing/cxl: Define a fixed volatile configuration to parse