[v2,11/28] cxl/port: Record parent dport when adding ports

Message ID	165784330511.1758207.16540797912136148491.stgit@dwillia2-xfh.jf.intel.com (mailing list archive)
State	Handled Elsewhere
Headers	show Return-Path: <linux-pci-owner@kernel.org> Subject: [PATCH v2 11/28] cxl/port: Record parent dport when adding ports From: Dan Williams <dan.j.williams@intel.com> To: linux-cxl@vger.kernel.org Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>, hch@lst.de, nvdimm@lists.linux.dev, linux-pci@vger.kernel.org Date: Thu, 14 Jul 2022 17:01:45 -0700 Message-ID: <165784330511.1758207.16540797912136148491.stgit@dwillia2-xfh.jf.intel.com> In-Reply-To: <165784324066.1758207.15025479284039479071.stgit@dwillia2-xfh.jf.intel.com> References: <165784324066.1758207.15025479284039479071.stgit@dwillia2-xfh.jf.intel.com> User-Agent: StGit/0.18-3-g996c MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk
Series	CXL PMEM Region Provisioning \| expand [v2,00/28] CXL PMEM Region Provisioning [v2,01/28] Documentation/cxl: Use a double line break between entries [v2,02/28] cxl/core: Define a 'struct cxl_switch_decoder' [v2,03/28] cxl/acpi: Track CXL resources in iomem_resource [v2,04/28] cxl/core: Define a 'struct cxl_root_decoder' [v2,05/28] cxl/core: Define a 'struct cxl_endpoint_decoder' [v2,06/28] cxl/hdm: Enumerate allocated DPA [v2,07/28] cxl/hdm: Add 'mode' attribute to decoder objects [v2,08/28] cxl/hdm: Track next decoder to allocate [v2,09/28] cxl/hdm: Add support for allocating DPA to an endpoint decoder [v2,10/28] cxl/port: Record dport in endpoint references [v2,11/28] cxl/port: Record parent dport when adding ports [v2,12/28] cxl/port: Move 'cxl_ep' references to an xarray per port [v2,13/28] cxl/port: Move dport tracking to an xarray [v2,14/28] cxl/hdm: Add sysfs attributes for interleave ways + granularity [v2,15/28] cxl/mem: Enumerate port targets before adding endpoints [v2,16/28] resource: Introduce alloc_free_mem_region() [v2,17/28] cxl/region: Add region creation support [v2,18/28] cxl/region: Add a 'uuid' attribute [v2,19/28] cxl/region: Add interleave geometry attributes [v2,20/28] cxl/region: Allocate HPA capacity to regions [v2,21/28] cxl/region: Enable the assignment of endpoint decoders to regions [v2,22/28] cxl/acpi: Add a host-bridge index lookup mechanism [v2,23/28] cxl/region: Attach endpoint decoders [v2,24/28] cxl/region: Program target lists [v2,25/28] cxl/hdm: Commit decoder state to hardware [v2,26/28] cxl/region: Add region driver boiler plate [v2,27/28] cxl/pmem: Fix offline_nvdimm_bus() to offline by bridge [v2,28/28] cxl/region: Introduce cxl_pmem_region objects

diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c index 8f021241699f..64004eb672d0 100644 --- a/drivers/cxl/acpi.c +++ b/drivers/cxl/acpi.c @@ -211,8 +211,7 @@ static int add_host_bridge_uport(struct device *match, void *arg) if (rc) return rc; - port = devm_cxl_add_port(host, match, dport->component_reg_phys, - root_port); + port = devm_cxl_add_port(host, match, dport->component_reg_phys, dport); if (IS_ERR(port)) return PTR_ERR(port); dev_dbg(host, "%s: add: %s\n", dev_name(match), dev_name(&port->dev)); diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index a8d350361548..6d2846404ab8 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -526,7 +526,7 @@ static struct lock_class_key cxl_port_key; static struct cxl_port *cxl_port_alloc(struct device *uport, resource_size_t component_reg_phys, - struct cxl_port *parent_port) + struct cxl_dport *parent_dport) { struct cxl_port *port; struct device *dev; @@ -549,11 +549,13 @@ static struct cxl_port *cxl_port_alloc(struct device *uport, * description. */ dev = &port->dev; - if (parent_port) { + if (parent_dport) { + struct cxl_port *parent_port = parent_dport->port; struct cxl_port *iter; dev->parent = &parent_port->dev; port->depth = parent_port->depth + 1; + port->parent_dport = parent_dport; /* * walk to the host bridge, or the first ancestor that knows @@ -595,24 +597,24 @@ static struct cxl_port *cxl_port_alloc(struct device *uport, * @host: host device for devm operations * @uport: "physical" device implementing this upstream port * @component_reg_phys: (optional) for configurable cxl_port instances - * @parent_port: next hop up in the CXL memory decode hierarchy + * @parent_dport: next hop up in the CXL memory decode hierarchy */ 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_dport *parent_dport) { struct cxl_port *port; struct device *dev; int rc; - port = cxl_port_alloc(uport, component_reg_phys, parent_port); + port = cxl_port_alloc(uport, component_reg_phys, parent_dport); if (IS_ERR(port)) return port; dev = &port->dev; if (is_cxl_memdev(uport)) rc = dev_set_name(dev, "endpoint%d", port->id); - else if (parent_port) + else if (parent_dport) rc = dev_set_name(dev, "port%d", port->id); else rc = dev_set_name(dev, "root%d", port->id); @@ -1014,7 +1016,7 @@ static void delete_endpoint(void *data) struct cxl_port *parent_port; struct device *parent; - parent_port = cxl_mem_find_port(cxlmd); + parent_port = cxl_mem_find_port(cxlmd, NULL); if (!parent_port) goto out; parent = &parent_port->dev; @@ -1149,8 +1151,8 @@ static int add_port_attach_ep(struct cxl_memdev *cxlmd, { struct device *dparent = grandparent(dport_dev); struct cxl_port *port, *parent_port = NULL; + struct cxl_dport *dport, *parent_dport; resource_size_t component_reg_phys; - struct cxl_dport *dport; int rc; if (!dparent) { @@ -1164,7 +1166,7 @@ static int add_port_attach_ep(struct cxl_memdev *cxlmd, return -ENXIO; } - parent_port = find_cxl_port(dparent, NULL); + parent_port = find_cxl_port(dparent, &parent_dport); if (!parent_port) { /* iterate to create this parent_port */ return -EAGAIN; @@ -1183,7 +1185,7 @@ static int add_port_attach_ep(struct cxl_memdev *cxlmd, if (!port) { component_reg_phys = find_component_registers(uport_dev); port = devm_cxl_add_port(&parent_port->dev, uport_dev, - component_reg_phys, parent_port); + component_reg_phys, parent_dport); /* retry find to pick up the new dport information */ if (!IS_ERR(port)) port = find_cxl_port_at(parent_port, dport_dev, &dport); @@ -1290,9 +1292,10 @@ int devm_cxl_enumerate_ports(struct cxl_memdev *cxlmd) } EXPORT_SYMBOL_NS_GPL(devm_cxl_enumerate_ports, CXL); -struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd) +struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd, + struct cxl_dport **dport) { - return find_cxl_port(grandparent(&cxlmd->dev), NULL); + return find_cxl_port(grandparent(&cxlmd->dev), dport); } EXPORT_SYMBOL_NS_GPL(cxl_mem_find_port, CXL); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 31f33844279a..973e0efe4bd4 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -332,6 +332,7 @@ struct cxl_nvdimm { * @id: id for port device-name * @dports: cxl_dport instances referenced by decoders * @endpoints: cxl_ep instances, endpoints that are a descendant of this port + * @parent_dport: dport that points to this port in the parent * @decoder_ida: allocator for decoder ids * @hdm_end: track last allocated HDM decoder instance for allocation ordering * @component_reg_phys: component register capability base address (optional) @@ -345,6 +346,7 @@ struct cxl_port { int id; struct list_head dports; struct list_head endpoints; + struct cxl_dport *parent_dport; struct ida decoder_ida; int hdm_end; resource_size_t component_reg_phys; @@ -399,11 +401,12 @@ int devm_cxl_register_pci_bus(struct device *host, struct device *uport, struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port); 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_dport *parent_dport); struct cxl_port *find_cxl_root(struct device *dev); int devm_cxl_enumerate_ports(struct cxl_memdev *cxlmd); int cxl_bus_rescan(void); -struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd); +struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd, + struct cxl_dport **dport); bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd); struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port, diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index 7513bea55145..2786d3402c9e 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -26,14 +26,15 @@ */ static int create_endpoint(struct cxl_memdev *cxlmd, - struct cxl_port *parent_port) + struct cxl_dport *parent_dport) { + struct cxl_port *parent_port = parent_dport->port; struct cxl_dev_state *cxlds = cxlmd->cxlds; struct cxl_port *endpoint; int rc; endpoint = devm_cxl_add_port(&parent_port->dev, &cxlmd->dev, - cxlds->component_reg_phys, parent_port); + cxlds->component_reg_phys, parent_dport); if (IS_ERR(endpoint)) return PTR_ERR(endpoint); @@ -76,6 +77,7 @@ static int cxl_mem_probe(struct device *dev) { struct cxl_memdev *cxlmd = to_cxl_memdev(dev); struct cxl_port *parent_port; + struct cxl_dport *dport; struct dentry *dentry; int rc; @@ -100,7 +102,7 @@ static int cxl_mem_probe(struct device *dev) if (rc) return rc; - parent_port = cxl_mem_find_port(cxlmd); + parent_port = cxl_mem_find_port(cxlmd, &dport); if (!parent_port) { dev_err(dev, "CXL port topology not found\n"); return -ENXIO; @@ -114,7 +116,7 @@ static int cxl_mem_probe(struct device *dev) goto unlock; } - rc = create_endpoint(cxlmd, parent_port); + rc = create_endpoint(cxlmd, dport); unlock: device_unlock(&parent_port->dev); put_device(&parent_port->dev);

[v2,11/28] cxl/port: Record parent dport when adding ports

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Patch