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cxl/region: Fix passthrough-decoder detection

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commit 711442e29f16f0d39dd0e2460c9baacfccb9d5a7 upstream.

A passthrough decoder is a decoder that maps only 1 target. It is a
special case because it does not impose any constraints on the
interleave-math as compared to a decoder with multiple targets. Extend
the passthrough case to multi-target-capable decoders that only have one
target selected. I.e. the current code was only considering passthrough
*ports* which are only a subset of the potential passthrough decoder
scenarios.

Fixes: e4f6dfa9ef75 ("cxl/region: Fix 'distance' calculation with passthrough ports")
Cc: <stable@vger.kernel.org>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/167564540422.847146.13816934143225777888.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Williams 2023-02-07 11:04:30 -08:00 committed by Greg Kroah-Hartman
parent a04c7d062b
commit 15f9f8eb3b
1 changed files with 2 additions and 2 deletions
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4
drivers/cxl/core/region.c
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@ -993,10 +993,10 @@ static int cxl_port_setup_targets(struct cxl_port *port,
int i, distance;
/*
* Passthrough ports impose no distance requirements between
* Passthrough decoders impose no distance requirements between
* peers
*/
if (port->nr_dports == 1)
if (cxl_rr->nr_targets == 1)
distance = 0;
else
distance = p->nr_targets / cxl_rr->nr_targets;