6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Robert Richter <rrichter@xxxxxxx>
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@xxxxxxx>
Fixes: 34e37b4c432c ("cxl/port: Enable HDM Capability after validating DVSEC Ranges")
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240216160113.407141-1-rrichter@xxxxxxx
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/cxl/core/pci.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -475,9 +475,9 @@ int cxl_hdm_decode_init(struct cxl_dev_s
allowed++;
}
- if (!allowed) {
- cxl_set_mem_enable(cxlds, 0);
- info->mem_enabled = 0;
+ if (!allowed && info->mem_enabled) {
+ dev_err(dev, "Range register decodes outside platform defined CXL ranges.\n");
+ return -ENXIO;
}
/*
