1 files changed, 0 insertions, 677 deletions

diff --git a/drivers/cxl/core/bus.c b/drivers/cxl/core/bus.c
deleted file mode 100644
index ebd061d03950..000000000000
--- a/drivers/cxl/core/bus.c
+++ /dev/null
@@ -1,677 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright(c) 2020 Intel Corporation. All rights reserved. */
-#include <linux/io-64-nonatomic-lo-hi.h>
-#include <linux/device.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/slab.h>
-#include <linux/idr.h>
-#include <cxlmem.h>
-#include <cxl.h>
-#include "core.h"
-
-/**
- * DOC: cxl core
- *
- * The CXL core provides a set of interfaces that can be consumed by CXL aware
- * drivers. The interfaces allow for creation, modification, and destruction of
- * regions, memory devices, ports, and decoders. CXL aware drivers must register
- * with the CXL core via these interfaces in order to be able to participate in
- * cross-device interleave coordination. The CXL core also establishes and
- * maintains the bridge to the nvdimm subsystem.
- *
- * CXL core introduces sysfs hierarchy to control the devices that are
- * instantiated by the core.
- */
-
-static DEFINE_IDA(cxl_port_ida);
-
-static ssize_t devtype_show(struct device *dev, struct device_attribute *attr,
-			    char *buf)
-{
-	return sysfs_emit(buf, "%s\n", dev->type->name);
-}
-static DEVICE_ATTR_RO(devtype);
-
-static struct attribute *cxl_base_attributes[] = {
-	&dev_attr_devtype.attr,
-	NULL,
-};
-
-struct attribute_group cxl_base_attribute_group = {
-	.attrs = cxl_base_attributes,
-};
-
-static ssize_t start_show(struct device *dev, struct device_attribute *attr,
-			  char *buf)
-{
-	struct cxl_decoder *cxld = to_cxl_decoder(dev);
-
-	return sysfs_emit(buf, "%#llx\n", cxld->range.start);
-}
-static DEVICE_ATTR_RO(start);
-
-static ssize_t size_show(struct device *dev, struct device_attribute *attr,
-			char *buf)
-{
-	struct cxl_decoder *cxld = to_cxl_decoder(dev);
-
-	return sysfs_emit(buf, "%#llx\n", range_len(&cxld->range));
-}
-static DEVICE_ATTR_RO(size);
-
-#define CXL_DECODER_FLAG_ATTR(name, flag)                            \
-static ssize_t name##_show(struct device *dev,                       \
-			   struct device_attribute *attr, char *buf) \
-{                                                                    \
-	struct cxl_decoder *cxld = to_cxl_decoder(dev);              \
-                                                                     \
-	return sysfs_emit(buf, "%s\n",                               \
-			  (cxld->flags & (flag)) ? "1" : "0");       \
-}                                                                    \
-static DEVICE_ATTR_RO(name)
-
-CXL_DECODER_FLAG_ATTR(cap_pmem, CXL_DECODER_F_PMEM);
-CXL_DECODER_FLAG_ATTR(cap_ram, CXL_DECODER_F_RAM);
-CXL_DECODER_FLAG_ATTR(cap_type2, CXL_DECODER_F_TYPE2);
-CXL_DECODER_FLAG_ATTR(cap_type3, CXL_DECODER_F_TYPE3);
-CXL_DECODER_FLAG_ATTR(locked, CXL_DECODER_F_LOCK);
-
-static ssize_t target_type_show(struct device *dev,
-				struct device_attribute *attr, char *buf)
-{
-	struct cxl_decoder *cxld = to_cxl_decoder(dev);
-
-	switch (cxld->target_type) {
-	case CXL_DECODER_ACCELERATOR:
-		return sysfs_emit(buf, "accelerator\n");
-	case CXL_DECODER_EXPANDER:
-		return sysfs_emit(buf, "expander\n");
-	}
-	return -ENXIO;
-}
-static DEVICE_ATTR_RO(target_type);
-
-static ssize_t target_list_show(struct device *dev,
-			       struct device_attribute *attr, char *buf)
-{
-	struct cxl_decoder *cxld = to_cxl_decoder(dev);
-	ssize_t offset = 0;
-	int i, rc = 0;
-
-	device_lock(dev);
-	for (i = 0; i < cxld->interleave_ways; i++) {
-		struct cxl_dport *dport = cxld->target[i];
-		struct cxl_dport *next = NULL;
-
-		if (!dport)
-			break;
-
-		if (i + 1 < cxld->interleave_ways)
-			next = cxld->target[i + 1];
-		rc = sysfs_emit_at(buf, offset, "%d%s", dport->port_id,
-				   next ? "," : "");
-		if (rc < 0)
-			break;
-		offset += rc;
-	}
-	device_unlock(dev);
-
-	if (rc < 0)
-		return rc;
-
-	rc = sysfs_emit_at(buf, offset, "\n");
-	if (rc < 0)
-		return rc;
-
-	return offset + rc;
-}
-static DEVICE_ATTR_RO(target_list);
-
-static struct attribute *cxl_decoder_base_attrs[] = {
-	&dev_attr_start.attr,
-	&dev_attr_size.attr,
-	&dev_attr_locked.attr,
-	&dev_attr_target_list.attr,
-	NULL,
-};
-
-static struct attribute_group cxl_decoder_base_attribute_group = {
-	.attrs = cxl_decoder_base_attrs,
-};
-
-static struct attribute *cxl_decoder_root_attrs[] = {
-	&dev_attr_cap_pmem.attr,
-	&dev_attr_cap_ram.attr,
-	&dev_attr_cap_type2.attr,
-	&dev_attr_cap_type3.attr,
-	NULL,
-};
-
-static struct attribute_group cxl_decoder_root_attribute_group = {
-	.attrs = cxl_decoder_root_attrs,
-};
-
-static const struct attribute_group *cxl_decoder_root_attribute_groups[] = {
-	&cxl_decoder_root_attribute_group,
-	&cxl_decoder_base_attribute_group,
-	&cxl_base_attribute_group,
-	NULL,
-};
-
-static struct attribute *cxl_decoder_switch_attrs[] = {
-	&dev_attr_target_type.attr,
-	NULL,
-};
-
-static struct attribute_group cxl_decoder_switch_attribute_group = {
-	.attrs = cxl_decoder_switch_attrs,
-};
-
-static const struct attribute_group *cxl_decoder_switch_attribute_groups[] = {
-	&cxl_decoder_switch_attribute_group,
-	&cxl_decoder_base_attribute_group,
-	&cxl_base_attribute_group,
-	NULL,
-};
-
-static void cxl_decoder_release(struct device *dev)
-{
-	struct cxl_decoder *cxld = to_cxl_decoder(dev);
-	struct cxl_port *port = to_cxl_port(dev->parent);
-
-	ida_free(&port->decoder_ida, cxld->id);
-	kfree(cxld);
-}
-
-static const struct device_type cxl_decoder_switch_type = {
-	.name = "cxl_decoder_switch",
-	.release = cxl_decoder_release,
-	.groups = cxl_decoder_switch_attribute_groups,
-};
-
-static const struct device_type cxl_decoder_root_type = {
-	.name = "cxl_decoder_root",
-	.release = cxl_decoder_release,
-	.groups = cxl_decoder_root_attribute_groups,
-};
-
-bool is_root_decoder(struct device *dev)
-{
-	return dev->type == &cxl_decoder_root_type;
-}
-EXPORT_SYMBOL_GPL(is_root_decoder);
-
-struct cxl_decoder *to_cxl_decoder(struct device *dev)
-{
-	if (dev_WARN_ONCE(dev, dev->type->release != cxl_decoder_release,
-			  "not a cxl_decoder device\n"))
-		return NULL;
-	return container_of(dev, struct cxl_decoder, dev);
-}
-EXPORT_SYMBOL_GPL(to_cxl_decoder);
-
-static void cxl_dport_release(struct cxl_dport *dport)
-{
-	list_del(&dport->list);
-	put_device(dport->dport);
-	kfree(dport);
-}
-
-static void cxl_port_release(struct device *dev)
-{
-	struct cxl_port *port = to_cxl_port(dev);
-	struct cxl_dport *dport, *_d;
-
-	device_lock(dev);
-	list_for_each_entry_safe(dport, _d, &port->dports, list)
-		cxl_dport_release(dport);
-	device_unlock(dev);
-	ida_free(&cxl_port_ida, port->id);
-	kfree(port);
-}
-
-static const struct attribute_group *cxl_port_attribute_groups[] = {
-	&cxl_base_attribute_group,
-	NULL,
-};
-
-static const struct device_type cxl_port_type = {
-	.name = "cxl_port",
-	.release = cxl_port_release,
-	.groups = cxl_port_attribute_groups,
-};
-
-struct cxl_port *to_cxl_port(struct device *dev)
-{
-	if (dev_WARN_ONCE(dev, dev->type != &cxl_port_type,
-			  "not a cxl_port device\n"))
-		return NULL;
-	return container_of(dev, struct cxl_port, dev);
-}
-
-static void unregister_port(void *_port)
-{
-	struct cxl_port *port = _port;
-	struct cxl_dport *dport;
-
-	device_lock(&port->dev);
-	list_for_each_entry(dport, &port->dports, list) {
-		char link_name[CXL_TARGET_STRLEN];
-
-		if (snprintf(link_name, CXL_TARGET_STRLEN, "dport%d",
-			     dport->port_id) >= CXL_TARGET_STRLEN)
-			continue;
-		sysfs_remove_link(&port->dev.kobj, link_name);
-	}
-	device_unlock(&port->dev);
-	device_unregister(&port->dev);
-}
-
-static void cxl_unlink_uport(void *_port)
-{
-	struct cxl_port *port = _port;
-
-	sysfs_remove_link(&port->dev.kobj, "uport");
-}
-
-static int devm_cxl_link_uport(struct device *host, struct cxl_port *port)
-{
-	int rc;
-
-	rc = sysfs_create_link(&port->dev.kobj, &port->uport->kobj, "uport");
-	if (rc)
-		return rc;
-	return devm_add_action_or_reset(host, cxl_unlink_uport, port);
-}
-
-static struct cxl_port *cxl_port_alloc(struct device *uport,
-				       resource_size_t component_reg_phys,
-				       struct cxl_port *parent_port)
-{
-	struct cxl_port *port;
-	struct device *dev;
-	int rc;
-
-	port = kzalloc(sizeof(*port), GFP_KERNEL);
-	if (!port)
-		return ERR_PTR(-ENOMEM);
-
-	rc = ida_alloc(&cxl_port_ida, GFP_KERNEL);
-	if (rc < 0)
-		goto err;
-	port->id = rc;
-
-	/*
-	 * The top-level cxl_port "cxl_root" does not have a cxl_port as
-	 * its parent and it does not have any corresponding component
-	 * registers as its decode is described by a fixed platform
-	 * description.
-	 */
-	dev = &port->dev;
-	if (parent_port)
-		dev->parent = &parent_port->dev;
-	else
-		dev->parent = uport;
-
-	port->uport = uport;
-	port->component_reg_phys = component_reg_phys;
-	ida_init(&port->decoder_ida);
-	INIT_LIST_HEAD(&port->dports);
-
-	device_initialize(dev);
-	device_set_pm_not_required(dev);
-	dev->bus = &cxl_bus_type;
-	dev->type = &cxl_port_type;
-
-	return port;
-
-err:
-	kfree(port);
-	return ERR_PTR(rc);
-}
-
-/**
- * devm_cxl_add_port - register a cxl_port in CXL memory decode hierarchy
- * @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
- */
-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 *port;
-	struct device *dev;
-	int rc;
-
-	port = cxl_port_alloc(uport, component_reg_phys, parent_port);
-	if (IS_ERR(port))
-		return port;
-
-	dev = &port->dev;
-	if (parent_port)
-		rc = dev_set_name(dev, "port%d", port->id);
-	else
-		rc = dev_set_name(dev, "root%d", port->id);
-	if (rc)
-		goto err;
-
-	rc = device_add(dev);
-	if (rc)
-		goto err;
-
-	rc = devm_add_action_or_reset(host, unregister_port, port);
-	if (rc)
-		return ERR_PTR(rc);
-
-	rc = devm_cxl_link_uport(host, port);
-	if (rc)
-		return ERR_PTR(rc);
-
-	return port;
-
-err:
-	put_device(dev);
-	return ERR_PTR(rc);
-}
-EXPORT_SYMBOL_GPL(devm_cxl_add_port);
-
-static struct cxl_dport *find_dport(struct cxl_port *port, int id)
-{
-	struct cxl_dport *dport;
-
-	device_lock_assert(&port->dev);
-	list_for_each_entry (dport, &port->dports, list)
-		if (dport->port_id == id)
-			return dport;
-	return NULL;
-}
-
-static int add_dport(struct cxl_port *port, struct cxl_dport *new)
-{
-	struct cxl_dport *dup;
-
-	device_lock(&port->dev);
-	dup = find_dport(port, new->port_id);
-	if (dup)
-		dev_err(&port->dev,
-			"unable to add dport%d-%s non-unique port id (%s)\n",
-			new->port_id, dev_name(new->dport),
-			dev_name(dup->dport));
-	else
-		list_add_tail(&new->list, &port->dports);
-	device_unlock(&port->dev);
-
-	return dup ? -EEXIST : 0;
-}
-
-/**
- * cxl_add_dport - append downstream port data to a cxl_port
- * @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
- * @component_reg_phys: optional location of CXL component registers
- *
- * Note that all allocations and links are undone by cxl_port deletion
- * and release.
- */
-int 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;
-	int rc;
-
-	if (snprintf(link_name, CXL_TARGET_STRLEN, "dport%d", port_id) >=
-	    CXL_TARGET_STRLEN)
-		return -EINVAL;
-
-	dport = kzalloc(sizeof(*dport), GFP_KERNEL);
-	if (!dport)
-		return -ENOMEM;
-
-	INIT_LIST_HEAD(&dport->list);
-	dport->dport = get_device(dport_dev);
-	dport->port_id = port_id;
-	dport->component_reg_phys = component_reg_phys;
-	dport->port = port;
-
-	rc = add_dport(port, dport);
-	if (rc)
-		goto err;
-
-	rc = sysfs_create_link(&port->dev.kobj, &dport_dev->kobj, link_name);
-	if (rc)
-		goto err;
-
-	return 0;
-err:
-	cxl_dport_release(dport);
-	return rc;
-}
-EXPORT_SYMBOL_GPL(cxl_add_dport);
-
-static int decoder_populate_targets(struct cxl_decoder *cxld,
-				    struct cxl_port *port, int *target_map)
-{
-	int rc = 0, i;
-
-	if (!target_map)
-		return 0;
-
-	device_lock(&port->dev);
-	if (list_empty(&port->dports)) {
-		rc = -EINVAL;
-		goto out_unlock;
-	}
-
-	for (i = 0; i < cxld->nr_targets; i++) {
-		struct cxl_dport *dport = find_dport(port, target_map[i]);
-
-		if (!dport) {
-			rc = -ENXIO;
-			goto out_unlock;
-		}
-		cxld->target[i] = dport;
-	}
-
-out_unlock:
-	device_unlock(&port->dev);
-
-	return rc;
-}
-
-struct cxl_decoder *cxl_decoder_alloc(struct cxl_port *port, int nr_targets)
-{
-	struct cxl_decoder *cxld, cxld_const_init = {
-		.nr_targets = nr_targets,
-	};
-	struct device *dev;
-	int rc = 0;
-
-	if (nr_targets > CXL_DECODER_MAX_INTERLEAVE || nr_targets < 1)
-		return ERR_PTR(-EINVAL);
-
-	cxld = kzalloc(struct_size(cxld, target, nr_targets), GFP_KERNEL);
-	if (!cxld)
-		return ERR_PTR(-ENOMEM);
-	memcpy(cxld, &cxld_const_init, sizeof(cxld_const_init));
-
-	rc = ida_alloc(&port->decoder_ida, GFP_KERNEL);
-	if (rc < 0)
-		goto err;
-
-	cxld->id = rc;
-	dev = &cxld->dev;
-	device_initialize(dev);
-	device_set_pm_not_required(dev);
-	dev->parent = &port->dev;
-	dev->bus = &cxl_bus_type;
-
-	/* root ports do not have a cxl_port_type parent */
-	if (port->dev.parent->type == &cxl_port_type)
-		dev->type = &cxl_decoder_switch_type;
-	else
-		dev->type = &cxl_decoder_root_type;
-
-	return cxld;
-err:
-	kfree(cxld);
-	return ERR_PTR(rc);
-}
-EXPORT_SYMBOL_GPL(cxl_decoder_alloc);
-
-int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map)
-{
-	struct cxl_port *port;
-	struct device *dev;
-	int rc;
-
-	if (WARN_ON_ONCE(!cxld))
-		return -EINVAL;
-
-	if (WARN_ON_ONCE(IS_ERR(cxld)))
-		return PTR_ERR(cxld);
-
-	if (cxld->interleave_ways < 1)
-		return -EINVAL;
-
-	port = to_cxl_port(cxld->dev.parent);
-	rc = decoder_populate_targets(cxld, port, target_map);
-	if (rc)
-		return rc;
-
-	dev = &cxld->dev;
-	rc = dev_set_name(dev, "decoder%d.%d", port->id, cxld->id);
-	if (rc)
-		return rc;
-
-	return device_add(dev);
-}
-EXPORT_SYMBOL_GPL(cxl_decoder_add);
-
-static void cxld_unregister(void *dev)
-{
-	device_unregister(dev);
-}
-
-int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld)
-{
-	return devm_add_action_or_reset(host, cxld_unregister, &cxld->dev);
-}
-EXPORT_SYMBOL_GPL(cxl_decoder_autoremove);
-
-/**
- * __cxl_driver_register - register a driver for the cxl bus
- * @cxl_drv: cxl driver structure to attach
- * @owner: owning module/driver
- * @modname: KBUILD_MODNAME for parent driver
- */
-int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner,
-			  const char *modname)
-{
-	if (!cxl_drv->probe) {
-		pr_debug("%s ->probe() must be specified\n", modname);
-		return -EINVAL;
-	}
-
-	if (!cxl_drv->name) {
-		pr_debug("%s ->name must be specified\n", modname);
-		return -EINVAL;
-	}
-
-	if (!cxl_drv->id) {
-		pr_debug("%s ->id must be specified\n", modname);
-		return -EINVAL;
-	}
-
-	cxl_drv->drv.bus = &cxl_bus_type;
-	cxl_drv->drv.owner = owner;
-	cxl_drv->drv.mod_name = modname;
-	cxl_drv->drv.name = cxl_drv->name;
-
-	return driver_register(&cxl_drv->drv);
-}
-EXPORT_SYMBOL_GPL(__cxl_driver_register);
-
-void cxl_driver_unregister(struct cxl_driver *cxl_drv)
-{
-	driver_unregister(&cxl_drv->drv);
-}
-EXPORT_SYMBOL_GPL(cxl_driver_unregister);
-
-static int cxl_device_id(struct device *dev)
-{
-	if (dev->type == &cxl_nvdimm_bridge_type)
-		return CXL_DEVICE_NVDIMM_BRIDGE;
-	if (dev->type == &cxl_nvdimm_type)
-		return CXL_DEVICE_NVDIMM;
-	return 0;
-}
-
-static int cxl_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
-{
-	return add_uevent_var(env, "MODALIAS=" CXL_MODALIAS_FMT,
-			      cxl_device_id(dev));
-}
-
-static int cxl_bus_match(struct device *dev, struct device_driver *drv)
-{
-	return cxl_device_id(dev) == to_cxl_drv(drv)->id;
-}
-
-static int cxl_bus_probe(struct device *dev)
-{
-	return to_cxl_drv(dev->driver)->probe(dev);
-}
-
-static void cxl_bus_remove(struct device *dev)
-{
-	struct cxl_driver *cxl_drv = to_cxl_drv(dev->driver);
-
-	if (cxl_drv->remove)
-		cxl_drv->remove(dev);
-}
-
-struct bus_type cxl_bus_type = {
-	.name = "cxl",
-	.uevent = cxl_bus_uevent,
-	.match = cxl_bus_match,
-	.probe = cxl_bus_probe,
-	.remove = cxl_bus_remove,
-};
-EXPORT_SYMBOL_GPL(cxl_bus_type);
-
-static __init int cxl_core_init(void)
-{
-	int rc;
-
-	cxl_mbox_init();
-
-	rc = cxl_memdev_init();
-	if (rc)
-		return rc;
-
-	rc = bus_register(&cxl_bus_type);
-	if (rc)
-		goto err;
-	return 0;
-
-err:
-	cxl_memdev_exit();
-	cxl_mbox_exit();
-	return rc;
-}
-
-static void cxl_core_exit(void)
-{
-	bus_unregister(&cxl_bus_type);
-	cxl_memdev_exit();
-	cxl_mbox_exit();
-}
-
-module_init(cxl_core_init);
-module_exit(cxl_core_exit);
-MODULE_LICENSE("GPL v2");