cxl/core/port: Remove @host argument for dport + decoder enumeration

Now that dport and decoder enumeration is centralized in the port
driver, the @host argument for these helpers can be made implicit. For
the root port the host is the port's uport device (ACPI0017 for
cxl_acpi), and for all other descendant ports the devm context is the
parent of @port.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Ben Widawsky <ben.widawsky@intel.com>
Link: https://lore.kernel.org/r/164375043390.484143.17617734732003230076.stgit@dwillia2-desk3.amr.corp.intel.comSigned-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/cxl/acpi.c

@@ -256,7 +256,7 @@ static int add_host_bridge_dport(struct device *match, void *arg)
 		return 0;
 	}
 
-	dport = devm_cxl_add_dport(host, root_port, match, uid, ctx.chbcr);
+	dport = devm_cxl_add_dport(root_port, match, uid, ctx.chbcr);
 	if (IS_ERR(dport)) {
 		dev_err(host, "failed to add downstream port: %s\n",
 			dev_name(match));

drivers/cxl/core/hdm.c

@@ -44,7 +44,7 @@ static int add_hdm_decoder(struct cxl_port *port, struct cxl_decoder *cxld,
  * are claimed and passed to the single dport. Disable the range until the first
  * CXL region is enumerated / activated.
  */
-int devm_cxl_add_passthrough_decoder(struct device *host, struct cxl_port *port)
+int devm_cxl_add_passthrough_decoder(struct cxl_port *port)
 {
 	struct cxl_decoder *cxld;
 	struct cxl_dport *dport;
@@ -93,21 +93,20 @@ static void __iomem *map_hdm_decoder_regs(struct cxl_port *port,
 
 /**
  * devm_cxl_setup_hdm - map HDM decoder component registers
- * @host: devm context for allocations
  * @port: cxl_port to map
  */
-struct cxl_hdm *devm_cxl_setup_hdm(struct device *host, struct cxl_port *port)
+struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port)
 {
 	struct device *dev = &port->dev;
 	void __iomem *crb, *hdm;
 	struct cxl_hdm *cxlhdm;
 
-	cxlhdm = devm_kzalloc(host, sizeof(*cxlhdm), GFP_KERNEL);
+	cxlhdm = devm_kzalloc(dev, sizeof(*cxlhdm), GFP_KERNEL);
 	if (!cxlhdm)
 		return ERR_PTR(-ENOMEM);
 
 	cxlhdm->port = port;
-	crb = devm_cxl_iomap_block(host, port->component_reg_phys,
+	crb = devm_cxl_iomap_block(dev, port->component_reg_phys,
 				   CXL_COMPONENT_REG_BLOCK_SIZE);
 	if (!crb) {
 		dev_err(dev, "No component registers mapped\n");
@@ -195,10 +194,9 @@ static void init_hdm_decoder(struct cxl_decoder *cxld, int *target_map,
 
 /**
  * devm_cxl_enumerate_decoders - add decoder objects per HDM register set
- * @host: devm allocation context
  * @cxlhdm: Structure to populate with HDM capabilities
  */
-int devm_cxl_enumerate_decoders(struct device *host, struct cxl_hdm *cxlhdm)
+int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm)
 {
 	void __iomem *hdm = cxlhdm->regs.hdm_decoder;
 	struct cxl_port *port = cxlhdm->port;

drivers/cxl/core/pci.c

@@ -15,7 +15,6 @@
 
 struct cxl_walk_context {
 	struct pci_bus *bus;
-	struct device *host;
 	struct cxl_port *port;
 	int type;
 	int error;
@@ -47,7 +46,7 @@ static int match_add_dports(struct pci_dev *pdev, void *data)
 		dev_dbg(&port->dev, "failed to find component registers\n");
 
 	port_num = FIELD_GET(PCI_EXP_LNKCAP_PN, lnkcap);
-	dport = devm_cxl_add_dport(ctx->host, port, &pdev->dev, port_num,
+	dport = devm_cxl_add_dport(port, &pdev->dev, port_num,
 				   cxl_regmap_to_base(pdev, &map));
 	if (IS_ERR(dport)) {
 		ctx->error = PTR_ERR(dport);
@@ -62,13 +61,12 @@ static int match_add_dports(struct pci_dev *pdev, void *data)
 
 /**
  * devm_cxl_port_enumerate_dports - enumerate downstream ports of the upstream port
- * @host: devm context
  * @port: cxl_port whose ->uport is the upstream of dports to be enumerated
  *
  * Returns a positive number of dports enumerated or a negative error
  * code.
  */
-int devm_cxl_port_enumerate_dports(struct device *host, struct cxl_port *port)
+int devm_cxl_port_enumerate_dports(struct cxl_port *port)
 {
 	struct pci_bus *bus = cxl_port_to_pci_bus(port);
 	struct cxl_walk_context ctx;
@@ -83,7 +81,6 @@ int devm_cxl_port_enumerate_dports(struct device *host, struct cxl_port *port)
 		type = PCI_EXP_TYPE_DOWNSTREAM;
 
 	ctx = (struct cxl_walk_context) {
-		.host = host,
 		.port = port,
 		.bus = bus,
 		.type = type,

drivers/cxl/core/port.c

@@ -576,7 +576,6 @@ static void cxl_dport_unlink(void *data)
 
 /**
  * devm_cxl_add_dport - append downstream port data to a cxl_port
- * @host: devm context for allocations
  * @port: the cxl_port that references this dport
  * @dport_dev: firmware or PCI device representing the dport
  * @port_id: identifier for this dport in a decoder's target list
@@ -586,14 +585,20 @@ static void cxl_dport_unlink(void *data)
  * either the port's host (for root ports), or the port itself (for
  * switch ports)
  */
-struct cxl_dport *devm_cxl_add_dport(struct device *host, struct cxl_port *port,
+struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
 				     struct device *dport_dev, int port_id,
 				     resource_size_t component_reg_phys)
 {
 	char link_name[CXL_TARGET_STRLEN];
 	struct cxl_dport *dport;
+	struct device *host;
 	int rc;
 
+	if (is_cxl_root(port))
+		host = port->uport;
+	else
+		host = &port->dev;
+
 	if (!host->driver) {
 		dev_WARN_ONCE(&port->dev, 1, "dport:%s bad devm context\n",
 			      dev_name(dport_dev));

drivers/cxl/cxl.h

@@ -313,7 +313,7 @@ struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport,
 				   resource_size_t component_reg_phys,
 				   struct cxl_port *parent_port);
 struct cxl_port *find_cxl_root(struct device *dev);
-struct cxl_dport *devm_cxl_add_dport(struct device *host, struct cxl_port *port,
+struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
 				     struct device *dport, int port_id,
 				     resource_size_t component_reg_phys);
 struct cxl_decoder *to_cxl_decoder(struct device *dev);
@@ -327,9 +327,9 @@ int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map);
 int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map);
 int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld);
 struct cxl_hdm;
-struct cxl_hdm *devm_cxl_setup_hdm(struct device *host, struct cxl_port *port);
-int devm_cxl_enumerate_decoders(struct device *host, struct cxl_hdm *cxlhdm);
-int devm_cxl_add_passthrough_decoder(struct device *host, struct cxl_port *port);
+struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port);
+int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm);
+int devm_cxl_add_passthrough_decoder(struct cxl_port *port);
 
 extern struct bus_type cxl_bus_type;
 

drivers/cxl/cxlpci.h

@@ -58,5 +58,5 @@ static inline resource_size_t cxl_regmap_to_base(struct pci_dev *pdev,
 	return pci_resource_start(pdev, map->barno) + map->block_offset;
 }
 
-int devm_cxl_port_enumerate_dports(struct device *host, struct cxl_port *port);
+int devm_cxl_port_enumerate_dports(struct cxl_port *port);
 #endif /* __CXL_PCI_H__ */

drivers/cxl/port.c

@@ -31,18 +31,18 @@ static int cxl_port_probe(struct device *dev)
 	struct cxl_hdm *cxlhdm;
 	int rc;
 
-	rc = devm_cxl_port_enumerate_dports(dev, port);
+	rc = devm_cxl_port_enumerate_dports(port);
 	if (rc < 0)
 		return rc;
 
 	if (rc == 1)
-		return devm_cxl_add_passthrough_decoder(dev, port);
+		return devm_cxl_add_passthrough_decoder(port);
 
-	cxlhdm = devm_cxl_setup_hdm(dev, port);
+	cxlhdm = devm_cxl_setup_hdm(port);
 	if (IS_ERR(cxlhdm))
 		return PTR_ERR(cxlhdm);
 
-	rc = devm_cxl_enumerate_decoders(dev, cxlhdm);
+	rc = devm_cxl_enumerate_decoders(cxlhdm);
 	if (rc) {
 		dev_err(dev, "Couldn't enumerate decoders (%d)\n", rc);
 		return rc;

tools/testing/cxl/test/cxl.c

@@ -399,8 +399,7 @@ static struct acpi_pci_root *mock_acpi_pci_find_root(acpi_handle handle)
 	return &mock_pci_root[host_bridge_index(adev)];
 }
 
-static struct cxl_hdm *mock_cxl_setup_hdm(struct device *host,
-					  struct cxl_port *port)
+static struct cxl_hdm *mock_cxl_setup_hdm(struct cxl_port *port)
 {
 	struct cxl_hdm *cxlhdm = devm_kzalloc(&port->dev, sizeof(*cxlhdm), GFP_KERNEL);
 
@@ -411,21 +410,18 @@ static struct cxl_hdm *mock_cxl_setup_hdm(struct device *host,
 	return cxlhdm;
 }
 
-static int mock_cxl_add_passthrough_decoder(struct device *host,
-					    struct cxl_port *port)
+static int mock_cxl_add_passthrough_decoder(struct cxl_port *port)
 {
 	dev_err(&port->dev, "unexpected passthrough decoder for cxl_test\n");
 	return -EOPNOTSUPP;
 }
 
-static int mock_cxl_enumerate_decoders(struct device *host,
-				       struct cxl_hdm *cxlhdm)
+static int mock_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm)
 {
 	return 0;
 }
 
-static int mock_cxl_port_enumerate_dports(struct device *host,
-					  struct cxl_port *port)
+static int mock_cxl_port_enumerate_dports(struct cxl_port *port)
 {
 	struct device *dev = &port->dev;
 	int i;
@@ -437,7 +433,7 @@ static int mock_cxl_port_enumerate_dports(struct device *host,
 		if (pdev->dev.parent != port->uport)
 			continue;
 
-		dport = devm_cxl_add_dport(host, port, &pdev->dev, pdev->id,
+		dport = devm_cxl_add_dport(port, &pdev->dev, pdev->id,
 					   CXL_RESOURCE_NONE);
 
 		if (IS_ERR(dport)) {

tools/testing/cxl/test/mock.c

@@ -131,66 +131,62 @@ __wrap_nvdimm_bus_register(struct device *dev,
 }
 EXPORT_SYMBOL_GPL(__wrap_nvdimm_bus_register);
 
-struct cxl_hdm *__wrap_devm_cxl_setup_hdm(struct device *host,
-					  struct cxl_port *port)
+struct cxl_hdm *__wrap_devm_cxl_setup_hdm(struct cxl_port *port)
 {
 	int index;
 	struct cxl_hdm *cxlhdm;
 	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
 
 	if (ops && ops->is_mock_port(port->uport))
-		cxlhdm = ops->devm_cxl_setup_hdm(host, port);
+		cxlhdm = ops->devm_cxl_setup_hdm(port);
 	else
-		cxlhdm = devm_cxl_setup_hdm(host, port);
+		cxlhdm = devm_cxl_setup_hdm(port);
 	put_cxl_mock_ops(index);
 
 	return cxlhdm;
 }
 EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_setup_hdm, CXL);
 
-int __wrap_devm_cxl_add_passthrough_decoder(struct device *host,
-					    struct cxl_port *port)
+int __wrap_devm_cxl_add_passthrough_decoder(struct cxl_port *port)
 {
 	int rc, index;
 	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
 
 	if (ops && ops->is_mock_port(port->uport))
-		rc = ops->devm_cxl_add_passthrough_decoder(host, port);
+		rc = ops->devm_cxl_add_passthrough_decoder(port);
 	else
-		rc = devm_cxl_add_passthrough_decoder(host, port);
+		rc = devm_cxl_add_passthrough_decoder(port);
 	put_cxl_mock_ops(index);
 
 	return rc;
 }
 EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_add_passthrough_decoder, CXL);
 
-int __wrap_devm_cxl_enumerate_decoders(struct device *host,
-				       struct cxl_hdm *cxlhdm)
+int __wrap_devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm)
 {
 	int rc, index;
 	struct cxl_port *port = cxlhdm->port;
 	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
 
 	if (ops && ops->is_mock_port(port->uport))
-		rc = ops->devm_cxl_enumerate_decoders(host, cxlhdm);
+		rc = ops->devm_cxl_enumerate_decoders(cxlhdm);
 	else
-		rc = devm_cxl_enumerate_decoders(host, cxlhdm);
+		rc = devm_cxl_enumerate_decoders(cxlhdm);
 	put_cxl_mock_ops(index);
 
 	return rc;
 }
 EXPORT_SYMBOL_NS_GPL(__wrap_devm_cxl_enumerate_decoders, CXL);
 
-int __wrap_devm_cxl_port_enumerate_dports(struct device *host,
-					  struct cxl_port *port)
+int __wrap_devm_cxl_port_enumerate_dports(struct cxl_port *port)
 {
 	int rc, index;
 	struct cxl_mock_ops *ops = get_cxl_mock_ops(&index);
 
 	if (ops && ops->is_mock_port(port->uport))
-		rc = ops->devm_cxl_port_enumerate_dports(host, port);
+		rc = ops->devm_cxl_port_enumerate_dports(port);
 	else
-		rc = devm_cxl_port_enumerate_dports(host, port);
+		rc = devm_cxl_port_enumerate_dports(port);
 	put_cxl_mock_ops(index);
 
 	return rc;

tools/testing/cxl/test/mock.h

@@ -19,11 +19,10 @@ struct cxl_mock_ops {
 	bool (*is_mock_bus)(struct pci_bus *bus);
 	bool (*is_mock_port)(struct device *dev);
 	bool (*is_mock_dev)(struct device *dev);
-	int (*devm_cxl_port_enumerate_dports)(struct device *host,
-					      struct cxl_port *port);
-	struct cxl_hdm *(*devm_cxl_setup_hdm)(struct device *host, struct cxl_port *port);
-	int (*devm_cxl_add_passthrough_decoder)(struct device *host, struct cxl_port *port);
-	int (*devm_cxl_enumerate_decoders)(struct device *host, struct cxl_hdm *hdm);
+	int (*devm_cxl_port_enumerate_dports)(struct cxl_port *port);
+	struct cxl_hdm *(*devm_cxl_setup_hdm)(struct cxl_port *port);
+	int (*devm_cxl_add_passthrough_decoder)(struct cxl_port *port);
+	int (*devm_cxl_enumerate_decoders)(struct cxl_hdm *hdm);
 };
 
 void register_cxl_mock_ops(struct cxl_mock_ops *ops);