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Message-ID: <20251006155836.791418-2-fabio.m.de.francesco@linux.intel.com>
Date: Mon, 6 Oct 2025 17:58:04 +0200
From: "Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>
To: linux-cxl@...r.kernel.org
Cc: Davidlohr Bueso <dave@...olabs.net>,
Jonathan Cameron <jonathan.cameron@...wei.com>,
Dave Jiang <dave.jiang@...el.com>,
Alison Schofield <alison.schofield@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>,
Ira Weiny <ira.weiny@...el.com>,
Dan Williams <dan.j.williams@...el.com>,
Jonathan Corbet <corbet@....net>,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
Gregory Price <gourry@...rry.net>,
Robert Richter <rrichter@....com>,
Cheatham Benjamin <benjamin.cheatham@....com>,
"Fabio M. De Francesco" <fabio.m.de.francesco@...ux.intel.com>
Subject: [PATCH 1/4 v5] cxl/core: Change match_*_by_range() signatures
Replace struct range parameter with struct cxl_endpoint_decoder of
which range is a member in the match_*_by_range() functions and rename
them according to their semantics.
This is in preparation for expanding these helpers to perform arch
specific Root Decoders and Region matchings with
cxl_endpoint_decoder(s).
Cc: Alison Schofield <alison.schofield@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Ira Weiny <ira.weiny@...el.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>
Signed-off-by: Fabio M. De Francesco <fabio.m.de.francesco@...ux.intel.com>
---
drivers/cxl/core/region.c | 62 ++++++++++++++++++++++-----------------
1 file changed, 35 insertions(+), 27 deletions(-)
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index e14c1d305b22..43a854036202 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -1766,27 +1766,29 @@ static int cmp_interleave_pos(const void *a, const void *b)
return cxled_a->pos - cxled_b->pos;
}
-static int match_switch_decoder_by_range(struct device *dev,
- const void *data)
+static int match_cxlsd_to_cxled_by_range(struct device *dev, const void *data)
{
+ const struct cxl_endpoint_decoder *cxled = data;
struct cxl_switch_decoder *cxlsd;
- const struct range *r1, *r2 = data;
-
+ const struct range *r1, *r2;
if (!is_switch_decoder(dev))
return 0;
cxlsd = to_cxl_switch_decoder(dev);
r1 = &cxlsd->cxld.hpa_range;
+ r2 = &cxled->cxld.hpa_range;
if (is_root_decoder(dev))
return range_contains(r1, r2);
return (r1->start == r2->start && r1->end == r2->end);
}
-static int find_pos_and_ways(struct cxl_port *port, struct range *range,
- int *pos, int *ways)
+static int find_pos_and_ways(struct cxl_port *port,
+ struct cxl_endpoint_decoder *cxled, int *pos,
+ int *ways)
{
+ struct range *range = &cxled->cxld.hpa_range;
struct cxl_switch_decoder *cxlsd;
struct cxl_port *parent;
struct device *dev;
@@ -1796,8 +1798,8 @@ static int find_pos_and_ways(struct cxl_port *port, struct range *range,
if (!parent)
return rc;
- dev = device_find_child(&parent->dev, range,
- match_switch_decoder_by_range);
+ dev = device_find_child(&parent->dev, cxled,
+ match_cxlsd_to_cxled_by_range);
if (!dev) {
dev_err(port->uport_dev,
"failed to find decoder mapping %#llx-%#llx\n",
@@ -1883,7 +1885,7 @@ static int cxl_calc_interleave_pos(struct cxl_endpoint_decoder *cxled)
if (is_cxl_root(iter))
break;
- rc = find_pos_and_ways(iter, range, &parent_pos, &parent_ways);
+ rc = find_pos_and_ways(iter, cxled, &parent_pos, &parent_ways);
if (rc)
return rc;
@@ -3342,24 +3344,30 @@ static int devm_cxl_add_dax_region(struct cxl_region *cxlr)
return rc;
}
-static int match_decoder_by_range(struct device *dev, const void *data)
+static int match_cxlrd_to_cxled_by_range(struct device *dev, const void *data)
{
- const struct range *r1, *r2 = data;
- struct cxl_decoder *cxld;
+ const struct cxl_endpoint_decoder *cxled = data;
+ struct cxl_root_decoder *cxlrd;
+ const struct range *r1, *r2;
- if (!is_switch_decoder(dev))
+ if (!is_root_decoder(dev))
return 0;
- cxld = to_cxl_decoder(dev);
- r1 = &cxld->hpa_range;
+ cxlrd = to_cxl_root_decoder(dev);
+ r1 = &cxlrd->cxlsd.cxld.hpa_range;
+ r2 = &cxled->cxld.hpa_range;
+
return range_contains(r1, r2);
}
static struct cxl_decoder *
-cxl_port_find_switch_decoder(struct cxl_port *port, struct range *hpa)
+cxl_port_find_root_decoder(struct cxl_port *port,
+ struct cxl_endpoint_decoder *cxled)
{
- struct device *cxld_dev = device_find_child(&port->dev, hpa,
- match_decoder_by_range);
+ struct device *cxld_dev;
+
+ cxld_dev = device_find_child(&port->dev, cxled,
+ match_cxlrd_to_cxled_by_range);
return cxld_dev ? to_cxl_decoder(cxld_dev) : NULL;
}
@@ -3371,9 +3379,8 @@ cxl_find_root_decoder(struct cxl_endpoint_decoder *cxled)
struct cxl_port *port = cxled_to_port(cxled);
struct cxl_root *cxl_root __free(put_cxl_root) = find_cxl_root(port);
struct cxl_decoder *root, *cxld = &cxled->cxld;
- struct range *hpa = &cxld->hpa_range;
- root = cxl_port_find_switch_decoder(&cxl_root->port, hpa);
+ root = cxl_port_find_root_decoder(&cxl_root->port, cxled);
if (!root) {
dev_err(cxlmd->dev.parent,
"%s:%s no CXL window for range %#llx:%#llx\n",
@@ -3385,11 +3392,12 @@ cxl_find_root_decoder(struct cxl_endpoint_decoder *cxled)
return to_cxl_root_decoder(&root->dev);
}
-static int match_region_by_range(struct device *dev, const void *data)
+static int match_region_to_cxled_by_range(struct device *dev, const void *data)
{
+ const struct cxl_endpoint_decoder *cxled = data;
+ const struct range *r = &cxled->cxld.hpa_range;
struct cxl_region_params *p;
struct cxl_region *cxlr;
- const struct range *r = data;
if (!is_cxl_region(dev))
return 0;
@@ -3547,12 +3555,13 @@ static struct cxl_region *construct_region(struct cxl_root_decoder *cxlrd,
}
static struct cxl_region *
-cxl_find_region_by_range(struct cxl_root_decoder *cxlrd, struct range *hpa)
+cxl_find_region_by_range(struct cxl_root_decoder *cxlrd,
+ struct cxl_endpoint_decoder *cxled)
{
struct device *region_dev;
- region_dev = device_find_child(&cxlrd->cxlsd.cxld.dev, hpa,
- match_region_by_range);
+ region_dev = device_find_child(&cxlrd->cxlsd.cxld.dev, cxled,
+ match_region_to_cxled_by_range);
if (!region_dev)
return NULL;
@@ -3561,7 +3570,6 @@ cxl_find_region_by_range(struct cxl_root_decoder *cxlrd, struct range *hpa)
int cxl_add_to_region(struct cxl_endpoint_decoder *cxled)
{
- struct range *hpa = &cxled->cxld.hpa_range;
struct cxl_region_params *p;
bool attach = false;
int rc;
@@ -3577,7 +3585,7 @@ int cxl_add_to_region(struct cxl_endpoint_decoder *cxled)
*/
mutex_lock(&cxlrd->range_lock);
struct cxl_region *cxlr __free(put_cxl_region) =
- cxl_find_region_by_range(cxlrd, hpa);
+ cxl_find_region_by_range(cxlrd, cxled);
if (!cxlr)
cxlr = construct_region(cxlrd, cxled);
mutex_unlock(&cxlrd->range_lock);
--
2.50.1
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