linux-kernel - [PATCH v4 11/23] cxl/port: Store the downstream port's Component Register mappings in struct cxl

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Message-ID: <20230523232214.55282-12-terry.bowman@amd.com>
Date:   Tue, 23 May 2023 18:22:02 -0500
From:   Terry Bowman <terry.bowman@....com>
To:     <alison.schofield@...el.com>, <vishal.l.verma@...el.com>,
        <ira.weiny@...el.com>, <bwidawsk@...nel.org>,
        <dan.j.williams@...el.com>, <dave.jiang@...el.com>,
        <Jonathan.Cameron@...wei.com>, <linux-cxl@...r.kernel.org>
CC:     <terry.bowman@....com>, <rrichter@....com>,
        <linux-kernel@...r.kernel.org>, <bhelgaas@...gle.com>
Subject: [PATCH v4 11/23] cxl/port: Store the downstream port's Component Register mappings in struct cxl_dport

From: Robert Richter <rrichter@....com>

Same as for ports, also store the downstream port's Component Register
mappings, use struct cxl_dport for that.

Signed-off-by: Robert Richter <rrichter@....com>
Signed-off-by: Terry Bowman <terry.bowman@....com>
---
 drivers/cxl/core/port.c | 11 +++++++++++
 drivers/cxl/cxl.h       |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 34e929f1723b..db2ba0c886e2 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -708,6 +708,13 @@ static inline int cxl_port_setup_regs(struct cxl_port *port,
 				   component_reg_phys);
 }
 
+static inline int cxl_dport_setup_regs(struct cxl_dport *dport,
+				       resource_size_t component_reg_phys)
+{
+	return cxl_setup_comp_regs(dport->dev, &dport->comp_map,
+				   component_reg_phys);
+}
+
 static struct cxl_port *__devm_cxl_add_port(struct device *host,
 					    struct device *uport,
 					    resource_size_t component_reg_phys,
@@ -986,6 +993,10 @@ __devm_cxl_add_dport(struct cxl_port *port, struct device *dport_dev,
 	dport->port = port;
 	dport->rcrb.base = rcrb;
 
+	rc = cxl_dport_setup_regs(dport, component_reg_phys);
+	if (rc && rc != -ENODEV)
+		return ERR_PTR(rc);
+
 	cond_cxl_root_lock(port);
 	rc = add_dport(port, dport);
 	cond_cxl_root_unlock(port);
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index c76e1f84ba61..dc83c1d0396e 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -601,6 +601,7 @@ struct cxl_rcrb_info {
  * struct cxl_dport - CXL downstream port
  * @dev: PCI bridge or firmware device representing the downstream link
  * @port: reference to cxl_port that contains this downstream port
+ * @comp_map: component register capability mappings
  * @port_id: unique hardware identifier for dport in decoder target list
  * @component_reg_phys: downstream port component registers
  * @rch: Indicate whether this dport was enumerated in RCH or VH mode
@@ -609,6 +610,7 @@ struct cxl_rcrb_info {
 struct cxl_dport {
 	struct device *dev;
 	struct cxl_port *port;
+	struct cxl_register_map comp_map;
 	int port_id;
 	resource_size_t component_reg_phys;
 	bool rch;
-- 
2.34.1