[PATCH v3 10/14] cxl/region: Collect host bridge decoders

[Ben Widawsky <ben.widawsky@intel.com>]

Part of host bridge verification in the CXL Type 3 Memory Device
Software Guide calculates the host bridge interleave target list (6th
step in the flow chart), ie. verification and state update are done in
the same step. Host bridge verification is already in place, so go ahead
and store the decoders with their target lists.

Switches are implemented in a separate patch.

Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
---
 drivers/cxl/region.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/cxl/region.c b/drivers/cxl/region.c
index 145d7bb02714..b8982be13bfe 100644
--- a/drivers/cxl/region.c
+++ b/drivers/cxl/region.c
@@ -428,6 +428,7 @@ static bool region_hb_rp_config_valid(struct cxl_region *cxlr,
 		return simple_config(cxlr, hbs[0]);
 
 	for (i = 0; i < hb_count; i++) {
+		struct cxl_decoder *cxld;
 		int idx, position_mask;
 		struct cxl_dport *rp;
 		struct cxl_port *hb;
@@ -486,6 +487,18 @@ static bool region_hb_rp_config_valid(struct cxl_region *cxlr,
 						"One or more devices are not connected to the correct Host Bridge Root Port\n");
 					goto err;
 				}
+
+				if (!state_update)
+					continue;
+
+				if (dev_WARN_ONCE(&cxld->dev,
+						  port_grouping >= cxld->nr_targets,
+						  "Invalid port grouping %d/%d\n",
+						  port_grouping, cxld->nr_targets))
+					goto err;
+
+				cxld->interleave_ways++;
+				cxld->target[port_grouping] = get_rp(ep);
 			}
 		}
 	}
@@ -538,7 +551,7 @@ static bool rootd_valid(const struct cxl_region *cxlr,
 
 struct rootd_context {
 	const struct cxl_region *cxlr;
-	struct cxl_port *hbs[CXL_DECODER_MAX_INTERLEAVE];
+	const struct cxl_port *hbs[CXL_DECODER_MAX_INTERLEAVE];
 	int count;
 };
 
@@ -564,7 +577,7 @@ static struct cxl_decoder *find_rootd(const struct cxl_region *cxlr,
 	struct rootd_context ctx;
 	struct device *ret;
 
-	ctx.cxlr = cxlr;
+	ctx.cxlr = (struct cxl_region *)cxlr;
 
 	ret = device_find_child((struct device *)&root->dev, &ctx, rootd_match);
 	if (ret)
-- 
2.35.0