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.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2022-02-01 13:23:14 -08:00 · 2022-02-01 13:23:14 -08:00 · 664bf11583
--- a/drivers/cxl/acpi.c
+++ b/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));
--- a/drivers/cxl/core/hdm.c
+++ b/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;
--- a/drivers/cxl/core/pci.c
+++ b/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,
--- a/drivers/cxl/core/port.c
+++ b/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));
--- a/drivers/cxl/cxl.h
+++ b/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;

--- a/drivers/cxl/cxlpci.h
+++ b/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__ */
--- a/drivers/cxl/port.c
+++ b/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;
--- a/tools/testing/cxl/test/cxl.c
+++ b/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)) {
--- a/tools/testing/cxl/test/mock.c
+++ b/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;
--- a/tools/testing/cxl/test/mock.h
+++ b/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);