From 4352b8aee98005853aa63f57d6377282de17a33f Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Aug 2026 13:28:57 -0700 Subject: Merge tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux Pull I3C updates from Alexandre Belloni: "A new driver this cycle, for the AMD AXI I3C controller. There are also new features such as IBI wakeup support, SETAASA device discovery and ACPI support for the the DAA methods, meaning we can now communicate with the SPD devices on DDR5 modules. New driver: - AMD AXI I3C master controller Subsystem: - I3C Common Command Code (CCC) handling improvements, especially around GET CCCs - SETAASA device discovery support - ACPI support for all existing DAA methods like SETDASA, SETNEWDA as well as I2C devices on I3C bus - IBI-based wakeup support Drivers: - dw: SETAASA support - mipi-i3c-hci: advertise IBI wakeup capability, AMD_PT I3C controller support, PIO queue management support for HCI v1.2 - renesas: improve suspend to RAM support, add runtime PM support" * tag 'i3c/for-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux: (70 commits) i3c: dw: reduce do_daa time if there's no client i3c: mipi-i3c-hci: Add support for AMD_PT I3C controller i3c: mipi-i3c-hci: Add PIO queue management support for HCI v1.2 i3c: mipi-i3c-hci: Fix missing STAT_IBI_STATUS_THLD in PIO mode i3c: dw: rename "pclk" to "apb" to match dt-binding i3c: dw: make struct dw_i3c_cmd smaller i3c: dw: use COMMAND_PORT_TRANSFER_ARG instead of hardcoding i3c: renesas: Don't register devices when ENTDAA times out i3c: master: dw-i3c-master: fix OD timing for first broadcast i3c: mipi-i3c-hci: Advertise IBI wakeup capability i3c: mipi-i3c-hci: Factor out i3c_hci_sysdev() i3c: mipi-i3c-hci-pci: Propagate I3C wakeup requirements to PCI i3c: master: Reject IBI requests from non-IBI-capable devices i3c: master: Add helper to query bus wakeup requirements i3c: master: Report wakeup events for IBIs i3c: master: Support IBI-based wakeup capability i3c: master: Fix potential UAF in i3c_device_match() i3c: master: Fix potential UAF in i3c_device_uevent() i3c: Make dev->desc locking assumptions explicit i3c: master: Fix use-after-free of master->this ... --- drivers/powercap/powercap_sys.c | 684 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 684 insertions(+) create mode 100644 drivers/powercap/powercap_sys.c (limited to 'drivers/powercap/powercap_sys.c') diff --git a/drivers/powercap/powercap_sys.c b/drivers/powercap/powercap_sys.c new file mode 100644 index 000000000..9197fa20d --- /dev/null +++ b/drivers/powercap/powercap_sys.c @@ -0,0 +1,684 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Power capping class + * Copyright (c) 2013, Intel Corporation. + */ + +#include +#include +#include +#include +#include +#include + +#define to_powercap_zone(n) container_of(n, struct powercap_zone, dev) +#define to_powercap_control_type(n) \ + container_of(n, struct powercap_control_type, dev) + +/* Power zone show function */ +#define define_power_zone_show(_attr) \ +static ssize_t _attr##_show(struct device *dev, \ + struct device_attribute *dev_attr,\ + char *buf) \ +{ \ + u64 value; \ + ssize_t len = -EINVAL; \ + struct powercap_zone *power_zone = to_powercap_zone(dev); \ + \ + if (power_zone->ops->get_##_attr) { \ + if (!power_zone->ops->get_##_attr(power_zone, &value)) \ + len = sysfs_emit(buf, "%lld\n", value); \ + } \ + \ + return len; \ +} + +/* The only meaningful input is 0 (reset), others are silently ignored */ +#define define_power_zone_store(_attr) \ +static ssize_t _attr##_store(struct device *dev,\ + struct device_attribute *dev_attr, \ + const char *buf, size_t count) \ +{ \ + int err; \ + struct powercap_zone *power_zone = to_powercap_zone(dev); \ + u64 value; \ + \ + err = kstrtoull(buf, 10, &value); \ + if (err) \ + return -EINVAL; \ + if (value) \ + return count; \ + if (power_zone->ops->reset_##_attr) { \ + if (!power_zone->ops->reset_##_attr(power_zone)) \ + return count; \ + } \ + \ + return -EINVAL; \ +} + +/* Power zone constraint show function */ +#define define_power_zone_constraint_show(_attr) \ +static ssize_t show_constraint_##_attr(struct device *dev, \ + struct device_attribute *dev_attr,\ + char *buf) \ +{ \ + u64 value; \ + ssize_t len = -ENODATA; \ + struct powercap_zone *power_zone = to_powercap_zone(dev); \ + int id; \ + struct powercap_zone_constraint *pconst;\ + \ + if (sscanf(dev_attr->attr.name, "constraint_%d_", &id) != 1) \ + return -EINVAL; \ + if (id >= power_zone->const_id_cnt) \ + return -EINVAL; \ + pconst = &power_zone->constraints[id]; \ + if (pconst && pconst->ops && pconst->ops->get_##_attr) { \ + if (!pconst->ops->get_##_attr(power_zone, id, &value)) \ + len = sysfs_emit(buf, "%lld\n", value); \ + } \ + \ + return len; \ +} + +/* Power zone constraint store function */ +#define define_power_zone_constraint_store(_attr) \ +static ssize_t store_constraint_##_attr(struct device *dev,\ + struct device_attribute *dev_attr, \ + const char *buf, size_t count) \ +{ \ + int err; \ + u64 value; \ + struct powercap_zone *power_zone = to_powercap_zone(dev); \ + int id; \ + struct powercap_zone_constraint *pconst;\ + \ + if (sscanf(dev_attr->attr.name, "constraint_%d_", &id) != 1) \ + return -EINVAL; \ + if (id >= power_zone->const_id_cnt) \ + return -EINVAL; \ + pconst = &power_zone->constraints[id]; \ + err = kstrtoull(buf, 10, &value); \ + if (err) \ + return -EINVAL; \ + if (pconst && pconst->ops && pconst->ops->set_##_attr) { \ + if (!pconst->ops->set_##_attr(power_zone, id, value)) \ + return count; \ + } \ + \ + return -ENODATA; \ +} + +/* Power zone information callbacks */ +define_power_zone_show(power_uw); +define_power_zone_show(max_power_range_uw); +define_power_zone_show(energy_uj); +define_power_zone_store(energy_uj); +define_power_zone_show(max_energy_range_uj); + +/* Power zone attributes */ +static DEVICE_ATTR_RO(max_power_range_uw); +static DEVICE_ATTR_RO(power_uw); +static DEVICE_ATTR_RO(max_energy_range_uj); +static DEVICE_ATTR_RW(energy_uj); + +/* Power zone constraint attributes callbacks */ +define_power_zone_constraint_show(power_limit_uw); +define_power_zone_constraint_store(power_limit_uw); +define_power_zone_constraint_show(time_window_us); +define_power_zone_constraint_store(time_window_us); +define_power_zone_constraint_show(max_power_uw); +define_power_zone_constraint_show(min_power_uw); +define_power_zone_constraint_show(max_time_window_us); +define_power_zone_constraint_show(min_time_window_us); + +/* For one time seeding of constraint device attributes */ +struct powercap_constraint_attr { + struct device_attribute power_limit_attr; + struct device_attribute time_window_attr; + struct device_attribute max_power_attr; + struct device_attribute min_power_attr; + struct device_attribute max_time_window_attr; + struct device_attribute min_time_window_attr; + struct device_attribute name_attr; +}; + +static struct powercap_constraint_attr + constraint_attrs[MAX_CONSTRAINTS_PER_ZONE]; + +/* A list of powercap control_types */ +static LIST_HEAD(powercap_cntrl_list); +/* Mutex to protect list of powercap control_types */ +static DEFINE_MUTEX(powercap_cntrl_list_lock); + +#define POWERCAP_CONSTRAINT_NAME_LEN 30 /* Some limit to avoid overflow */ +static ssize_t show_constraint_name(struct device *dev, + struct device_attribute *dev_attr, + char *buf) +{ + const char *name; + struct powercap_zone *power_zone = to_powercap_zone(dev); + int id; + ssize_t len = -ENODATA; + struct powercap_zone_constraint *pconst; + + if (sscanf(dev_attr->attr.name, "constraint_%d_", &id) != 1) + return -EINVAL; + if (id >= power_zone->const_id_cnt) + return -EINVAL; + pconst = &power_zone->constraints[id]; + + if (pconst && pconst->ops && pconst->ops->get_name) { + name = pconst->ops->get_name(power_zone, id); + if (name) { + len = sysfs_emit(buf, "%.*s\n", + POWERCAP_CONSTRAINT_NAME_LEN - 1, name); + } + } + + return len; +} + +static int create_constraint_attribute(int id, const char *name, + int mode, + struct device_attribute *dev_attr, + ssize_t (*show)(struct device *, + struct device_attribute *, char *), + ssize_t (*store)(struct device *, + struct device_attribute *, + const char *, size_t) + ) +{ + + dev_attr->attr.name = kasprintf(GFP_KERNEL, "constraint_%d_%s", + id, name); + if (!dev_attr->attr.name) + return -ENOMEM; + dev_attr->attr.mode = mode; + dev_attr->show = show; + dev_attr->store = store; + + return 0; +} + +static void free_constraint_attributes(void) +{ + int i; + + for (i = 0; i < MAX_CONSTRAINTS_PER_ZONE; ++i) { + kfree(constraint_attrs[i].power_limit_attr.attr.name); + kfree(constraint_attrs[i].time_window_attr.attr.name); + kfree(constraint_attrs[i].name_attr.attr.name); + kfree(constraint_attrs[i].max_power_attr.attr.name); + kfree(constraint_attrs[i].min_power_attr.attr.name); + kfree(constraint_attrs[i].max_time_window_attr.attr.name); + kfree(constraint_attrs[i].min_time_window_attr.attr.name); + } +} + +static int seed_constraint_attributes(void) +{ + int i; + int ret; + + for (i = 0; i < MAX_CONSTRAINTS_PER_ZONE; ++i) { + ret = create_constraint_attribute(i, "power_limit_uw", + S_IWUSR | S_IRUGO, + &constraint_attrs[i].power_limit_attr, + show_constraint_power_limit_uw, + store_constraint_power_limit_uw); + if (ret) + goto err_alloc; + ret = create_constraint_attribute(i, "time_window_us", + S_IWUSR | S_IRUGO, + &constraint_attrs[i].time_window_attr, + show_constraint_time_window_us, + store_constraint_time_window_us); + if (ret) + goto err_alloc; + ret = create_constraint_attribute(i, "name", S_IRUGO, + &constraint_attrs[i].name_attr, + show_constraint_name, + NULL); + if (ret) + goto err_alloc; + ret = create_constraint_attribute(i, "max_power_uw", S_IRUGO, + &constraint_attrs[i].max_power_attr, + show_constraint_max_power_uw, + NULL); + if (ret) + goto err_alloc; + ret = create_constraint_attribute(i, "min_power_uw", S_IRUGO, + &constraint_attrs[i].min_power_attr, + show_constraint_min_power_uw, + NULL); + if (ret) + goto err_alloc; + ret = create_constraint_attribute(i, "max_time_window_us", + S_IRUGO, + &constraint_attrs[i].max_time_window_attr, + show_constraint_max_time_window_us, + NULL); + if (ret) + goto err_alloc; + ret = create_constraint_attribute(i, "min_time_window_us", + S_IRUGO, + &constraint_attrs[i].min_time_window_attr, + show_constraint_min_time_window_us, + NULL); + if (ret) + goto err_alloc; + + } + + return 0; + +err_alloc: + free_constraint_attributes(); + + return ret; +} + +static int create_constraints(struct powercap_zone *power_zone, + int nr_constraints, + const struct powercap_zone_constraint_ops *const_ops) +{ + int i; + int ret = 0; + int count; + struct powercap_zone_constraint *pconst; + + if (!power_zone || !const_ops || !const_ops->get_power_limit_uw || + !const_ops->set_power_limit_uw || + !const_ops->get_time_window_us || + !const_ops->set_time_window_us) + return -EINVAL; + + count = power_zone->zone_attr_count; + for (i = 0; i < nr_constraints; ++i) { + pconst = &power_zone->constraints[i]; + pconst->ops = const_ops; + pconst->id = power_zone->const_id_cnt; + power_zone->const_id_cnt++; + power_zone->zone_dev_attrs[count++] = + &constraint_attrs[i].power_limit_attr.attr; + power_zone->zone_dev_attrs[count++] = + &constraint_attrs[i].time_window_attr.attr; + if (pconst->ops->get_name) + power_zone->zone_dev_attrs[count++] = + &constraint_attrs[i].name_attr.attr; + if (pconst->ops->get_max_power_uw) + power_zone->zone_dev_attrs[count++] = + &constraint_attrs[i].max_power_attr.attr; + if (pconst->ops->get_min_power_uw) + power_zone->zone_dev_attrs[count++] = + &constraint_attrs[i].min_power_attr.attr; + if (pconst->ops->get_max_time_window_us) + power_zone->zone_dev_attrs[count++] = + &constraint_attrs[i].max_time_window_attr.attr; + if (pconst->ops->get_min_time_window_us) + power_zone->zone_dev_attrs[count++] = + &constraint_attrs[i].min_time_window_attr.attr; + } + power_zone->zone_attr_count = count; + + return ret; +} + +static bool control_type_valid(void *control_type) +{ + struct powercap_control_type *pos = NULL; + bool found = false; + + mutex_lock(&powercap_cntrl_list_lock); + + list_for_each_entry(pos, &powercap_cntrl_list, node) { + if (pos == control_type) { + found = true; + break; + } + } + mutex_unlock(&powercap_cntrl_list_lock); + + return found; +} + +static ssize_t name_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct powercap_zone *power_zone = to_powercap_zone(dev); + + return sysfs_emit(buf, "%s\n", power_zone->name); +} + +static DEVICE_ATTR_RO(name); + +/* Create zone and attributes in sysfs */ +static void create_power_zone_common_attributes( + struct powercap_zone *power_zone) +{ + int count = 0; + + power_zone->zone_dev_attrs[count++] = &dev_attr_name.attr; + if (power_zone->ops->get_max_energy_range_uj) + power_zone->zone_dev_attrs[count++] = + &dev_attr_max_energy_range_uj.attr; + if (power_zone->ops->get_energy_uj) { + if (power_zone->ops->reset_energy_uj) + dev_attr_energy_uj.attr.mode = S_IWUSR | S_IRUSR; + else + dev_attr_energy_uj.attr.mode = S_IRUSR; + power_zone->zone_dev_attrs[count++] = + &dev_attr_energy_uj.attr; + } + if (power_zone->ops->get_power_uw) + power_zone->zone_dev_attrs[count++] = + &dev_attr_power_uw.attr; + if (power_zone->ops->get_max_power_range_uw) + power_zone->zone_dev_attrs[count++] = + &dev_attr_max_power_range_uw.attr; + power_zone->zone_dev_attrs[count] = NULL; + power_zone->zone_attr_count = count; +} + +static void powercap_release(struct device *dev) +{ + bool allocated; + + if (dev->parent) { + struct powercap_zone *power_zone = to_powercap_zone(dev); + + /* Store flag as the release() may free memory */ + allocated = power_zone->allocated; + /* Remove id from parent idr struct */ + idr_remove(power_zone->parent_idr, power_zone->id); + /* Destroy idrs allocated for this zone */ + idr_destroy(&power_zone->idr); + kfree(power_zone->name); + kfree(power_zone->zone_dev_attrs); + kfree(power_zone->constraints); + if (power_zone->ops->release) + power_zone->ops->release(power_zone); + if (allocated) + kfree(power_zone); + } else { + struct powercap_control_type *control_type = + to_powercap_control_type(dev); + + /* Store flag as the release() may free memory */ + allocated = control_type->allocated; + idr_destroy(&control_type->idr); + mutex_destroy(&control_type->lock); + if (control_type->ops && control_type->ops->release) + control_type->ops->release(control_type); + if (allocated) + kfree(control_type); + } +} + +static ssize_t enabled_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + bool mode = true; + + /* Default is enabled */ + if (dev->parent) { + struct powercap_zone *power_zone = to_powercap_zone(dev); + if (power_zone->ops->get_enable) + if (power_zone->ops->get_enable(power_zone, &mode)) + mode = false; + } else { + struct powercap_control_type *control_type = + to_powercap_control_type(dev); + if (control_type->ops && control_type->ops->get_enable) + if (control_type->ops->get_enable(control_type, &mode)) + mode = false; + } + + return sysfs_emit(buf, "%d\n", mode); +} + +static ssize_t enabled_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + bool mode; + + if (kstrtobool(buf, &mode)) + return -EINVAL; + if (dev->parent) { + struct powercap_zone *power_zone = to_powercap_zone(dev); + if (power_zone->ops->set_enable) + if (!power_zone->ops->set_enable(power_zone, mode)) + return len; + } else { + struct powercap_control_type *control_type = + to_powercap_control_type(dev); + if (control_type->ops && control_type->ops->set_enable) + if (!control_type->ops->set_enable(control_type, mode)) + return len; + } + + return -ENOSYS; +} + +static DEVICE_ATTR_RW(enabled); + +static struct attribute *powercap_attrs[] = { + &dev_attr_enabled.attr, + NULL, +}; +ATTRIBUTE_GROUPS(powercap); + +static struct class powercap_class = { + .name = "powercap", + .dev_release = powercap_release, + .dev_groups = powercap_groups, +}; + +struct powercap_zone *powercap_register_zone( + struct powercap_zone *power_zone, + struct powercap_control_type *control_type, + const char *name, + struct powercap_zone *parent, + const struct powercap_zone_ops *ops, + int nr_constraints, + const struct powercap_zone_constraint_ops *const_ops) +{ + int result; + int nr_attrs; + + if (!name || !control_type || !ops || + nr_constraints > MAX_CONSTRAINTS_PER_ZONE || + (!ops->get_energy_uj && !ops->get_power_uw) || + !control_type_valid(control_type)) + return ERR_PTR(-EINVAL); + + if (power_zone) { + if (!ops->release) + return ERR_PTR(-EINVAL); + memset(power_zone, 0, sizeof(*power_zone)); + } else { + power_zone = kzalloc_obj(*power_zone); + if (!power_zone) + return ERR_PTR(-ENOMEM); + power_zone->allocated = true; + } + power_zone->ops = ops; + power_zone->control_type_inst = control_type; + if (!parent) { + power_zone->dev.parent = &control_type->dev; + power_zone->parent_idr = &control_type->idr; + } else { + power_zone->dev.parent = &parent->dev; + power_zone->parent_idr = &parent->idr; + } + power_zone->dev.class = &powercap_class; + + mutex_lock(&control_type->lock); + /* Using idr to get the unique id */ + result = idr_alloc(power_zone->parent_idr, NULL, 0, 0, GFP_KERNEL); + if (result < 0) + goto err_idr_alloc; + + power_zone->id = result; + idr_init(&power_zone->idr); + result = -ENOMEM; + power_zone->name = kstrdup(name, GFP_KERNEL); + if (!power_zone->name) + goto err_name_alloc; + power_zone->constraints = kzalloc_objs(*power_zone->constraints, + nr_constraints); + if (!power_zone->constraints) + goto err_const_alloc; + + nr_attrs = nr_constraints * POWERCAP_CONSTRAINTS_ATTRS + + POWERCAP_ZONE_MAX_ATTRS + 1; + power_zone->zone_dev_attrs = kcalloc(nr_attrs, sizeof(void *), + GFP_KERNEL); + if (!power_zone->zone_dev_attrs) + goto err_attr_alloc; + create_power_zone_common_attributes(power_zone); + result = create_constraints(power_zone, nr_constraints, const_ops); + if (result) + goto err_dev_ret; + + power_zone->zone_dev_attrs[power_zone->zone_attr_count] = NULL; + power_zone->dev_zone_attr_group.attrs = power_zone->zone_dev_attrs; + power_zone->dev_attr_groups[0] = &power_zone->dev_zone_attr_group; + power_zone->dev_attr_groups[1] = NULL; + power_zone->dev.groups = power_zone->dev_attr_groups; + dev_set_name(&power_zone->dev, "%s:%x", + dev_name(power_zone->dev.parent), + power_zone->id); + result = device_register(&power_zone->dev); + if (result) { + put_device(&power_zone->dev); + mutex_unlock(&control_type->lock); + + return ERR_PTR(result); + } + + control_type->nr_zones++; + mutex_unlock(&control_type->lock); + + return power_zone; + +err_dev_ret: + kfree(power_zone->zone_dev_attrs); +err_attr_alloc: + kfree(power_zone->constraints); +err_const_alloc: + kfree(power_zone->name); +err_name_alloc: + idr_remove(power_zone->parent_idr, power_zone->id); +err_idr_alloc: + if (power_zone->allocated) + kfree(power_zone); + mutex_unlock(&control_type->lock); + + return ERR_PTR(result); +} +EXPORT_SYMBOL_GPL(powercap_register_zone); + +int powercap_unregister_zone(struct powercap_control_type *control_type, + struct powercap_zone *power_zone) +{ + if (!power_zone || !control_type) + return -EINVAL; + + mutex_lock(&control_type->lock); + control_type->nr_zones--; + mutex_unlock(&control_type->lock); + + device_unregister(&power_zone->dev); + + return 0; +} +EXPORT_SYMBOL_GPL(powercap_unregister_zone); + +struct powercap_control_type *powercap_register_control_type( + struct powercap_control_type *control_type, + const char *name, + const struct powercap_control_type_ops *ops) +{ + int result; + + if (!name) + return ERR_PTR(-EINVAL); + if (control_type) { + if (!ops || !ops->release) + return ERR_PTR(-EINVAL); + memset(control_type, 0, sizeof(*control_type)); + } else { + control_type = kzalloc_obj(*control_type); + if (!control_type) + return ERR_PTR(-ENOMEM); + control_type->allocated = true; + } + mutex_init(&control_type->lock); + control_type->ops = ops; + INIT_LIST_HEAD(&control_type->node); + control_type->dev.class = &powercap_class; + dev_set_name(&control_type->dev, "%s", name); + idr_init(&control_type->idr); + + mutex_lock(&powercap_cntrl_list_lock); + list_add_tail(&control_type->node, &powercap_cntrl_list); + mutex_unlock(&powercap_cntrl_list_lock); + + result = device_register(&control_type->dev); + if (result) { + mutex_lock(&powercap_cntrl_list_lock); + list_del(&control_type->node); + mutex_unlock(&powercap_cntrl_list_lock); + + idr_destroy(&control_type->idr); + put_device(&control_type->dev); + return ERR_PTR(result); + } + + return control_type; +} +EXPORT_SYMBOL_GPL(powercap_register_control_type); + +int powercap_unregister_control_type(struct powercap_control_type *control_type) +{ + struct powercap_control_type *pos = NULL; + + if (control_type->nr_zones) { + dev_err(&control_type->dev, "Zones of this type still not freed\n"); + return -EINVAL; + } + mutex_lock(&powercap_cntrl_list_lock); + list_for_each_entry(pos, &powercap_cntrl_list, node) { + if (pos == control_type) { + list_del(&control_type->node); + mutex_unlock(&powercap_cntrl_list_lock); + device_unregister(&control_type->dev); + return 0; + } + } + mutex_unlock(&powercap_cntrl_list_lock); + + return -ENODEV; +} +EXPORT_SYMBOL_GPL(powercap_unregister_control_type); + +static int __init powercap_init(void) +{ + int result; + + result = seed_constraint_attributes(); + if (result) + return result; + + return class_register(&powercap_class); +} + +fs_initcall(powercap_init); + +MODULE_DESCRIPTION("PowerCap sysfs Driver"); +MODULE_AUTHOR("Srinivas Pandruvada "); -- cgit v1.3.1