cxl/region: Move HPA setup to cxl_region_attach()

A recent bug fix added the setup of the endpoint decoder interleave
geometry settings to cxl_region_attach(). Move the HPA setup there as
well to keep all endpoint decoder parameter setting in a central
location.

For symmetry, move endpoint HPA teardown to cxl_region_detach(), and for
switches move HPA setup / teardown to cxl_port_{setup,reset}_targets().

Cc: Jonathan Cameron <[e-mail]>
Signed-off-by: Vishal Verma <[e-mail]>
Reviewed-by: Ira Weiny <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dan Williams <[e-mail]>

drivers/cxl/core/hdm.c

···
 			  CXL_HDM_DECODER0_CTRL_TYPE);
 }
 
-static void cxld_set_hpa(struct cxl_decoder *cxld, u64 *base, u64 *size)
-{
-	struct cxl_region *cxlr = cxld->region;
-	struct cxl_region_params *p = &cxlr->params;
-
-	cxld->hpa_range = (struct range) {
-		.start = p->res->start,
-		.end = p->res->end,
-	};
-
-	*base = p->res->start;
-	*size = resource_size(p->res);
-}
-
-static void cxld_clear_hpa(struct cxl_decoder *cxld)
-{
-	cxld->hpa_range = (struct range) {
-		.start = 0,
-		.end = -1,
-	};
-}
-
 static int cxlsd_set_targets(struct cxl_switch_decoder *cxlsd, u64 *tgt)
 {
 	struct cxl_dport **t = &cxlsd->target[0];
···
 	ctrl = readl(hdm + CXL_HDM_DECODER0_CTRL_OFFSET(cxld->id));
 	cxld_set_interleave(cxld, &ctrl);
 	cxld_set_type(cxld, &ctrl);
-	cxld_set_hpa(cxld, &base, &size);
+	base = cxld->hpa_range.start;
+	size = range_len(&cxld->hpa_range);
 
 	writel(upper_32_bits(base), hdm + CXL_HDM_DECODER0_BASE_HIGH_OFFSET(id));
 	writel(lower_32_bits(base), hdm + CXL_HDM_DECODER0_BASE_LOW_OFFSET(id));
···
 	ctrl &= ~CXL_HDM_DECODER0_CTRL_COMMIT;
 	writel(ctrl, hdm + CXL_HDM_DECODER0_CTRL_OFFSET(id));
 
-	cxld_clear_hpa(cxld);
 	writel(0, hdm + CXL_HDM_DECODER0_SIZE_HIGH_OFFSET(id));
 	writel(0, hdm + CXL_HDM_DECODER0_SIZE_LOW_OFFSET(id));
 	writel(0, hdm + CXL_HDM_DECODER0_BASE_HIGH_OFFSET(id));

drivers/cxl/core/region.c

···
 
 	cxld->interleave_ways = iw;
 	cxld->interleave_granularity = ig;
+	cxld->hpa_range = (struct range) {
+		.start = p->res->start,
+		.end = p->res->end,
+	};
 	dev_dbg(&cxlr->dev, "%s:%s iw: %d ig: %d\n", dev_name(port->uport),
 		dev_name(&port->dev), iw, ig);
 add_target:
···
 				   struct cxl_region *cxlr)
 {
 	struct cxl_region_ref *cxl_rr = cxl_rr_load(port, cxlr);
+	struct cxl_decoder *cxld;
 
 	/*
 	 * After the last endpoint has been detached the entire cxl_rr may now
 	 * be gone.
 	 */
-	if (cxl_rr)
-		cxl_rr->nr_targets_set = 0;
+	if (!cxl_rr)
+		return;
+	cxl_rr->nr_targets_set = 0;
+
+	cxld = cxl_rr->decoder;
+	cxld->hpa_range = (struct range) {
+		.start = 0,
+		.end = -1,
+	};
 }
 
 static void cxl_region_teardown_targets(struct cxl_region *cxlr)
···
 
 	cxled->cxld.interleave_ways = p->interleave_ways;
 	cxled->cxld.interleave_granularity = p->interleave_granularity;
+	cxled->cxld.hpa_range = (struct range) {
+		.start = p->res->start,
+		.end = p->res->end,
+	};
 
 	return 0;
 
···
 	}
 	p->targets[cxled->pos] = NULL;
 	p->nr_targets--;
+	cxled->cxld.hpa_range = (struct range) {
+		.start = 0,
+		.end = -1,
+	};
 
 	/* notify the region driver that one of its targets has departed */
 	up_write(&cxl_region_rwsem);