diff options
| -rw-r--r-- | Documentation/driver-api/device_connection.rst | 43 | ||||
| -rw-r--r-- | Documentation/driver-api/driver-model/devres.rst | 1 | ||||
| -rw-r--r-- | Documentation/driver-api/firmware/fallback-mechanisms.rst | 1 | ||||
| -rw-r--r-- | Documentation/driver-api/index.rst | 1 | ||||
| -rw-r--r-- | MAINTAINERS | 6 | ||||
| -rw-r--r-- | drivers/base/Makefile | 2 | ||||
| -rw-r--r-- | drivers/base/dd.c | 5 | ||||
| -rw-r--r-- | drivers/base/devcon.c | 231 | ||||
| -rw-r--r-- | drivers/base/devres.c | 105 | ||||
| -rw-r--r-- | drivers/base/platform.c | 20 | ||||
| -rw-r--r-- | drivers/base/property.c | 73 | ||||
| -rw-r--r-- | drivers/base/syscore.c | 8 | ||||
| -rw-r--r-- | drivers/hwmon/pmbus/pmbus_core.c | 28 | ||||
| -rw-r--r-- | drivers/iio/adc/xilinx-xadc-core.c | 16 | ||||
| -rw-r--r-- | drivers/usb/roles/class.c | 12 | ||||
| -rw-r--r-- | drivers/usb/typec/mux.c | 19 | ||||
| -rw-r--r-- | include/linux/device.h | 58 | ||||
| -rw-r--r-- | include/linux/property.h | 14 | ||||
| -rw-r--r-- | lib/devres.c | 20 | ||||
| -rwxr-xr-x | scripts/dev-needs.sh | 315 |
20 files changed, 584 insertions, 394 deletions
diff --git a/Documentation/driver-api/device_connection.rst b/Documentation/driver-api/device_connection.rst deleted file mode 100644 index ba364224c349..000000000000 --- a/Documentation/driver-api/device_connection.rst +++ /dev/null @@ -1,43 +0,0 @@ -================== -Device connections -================== - -Introduction ------------- - -Devices often have connections to other devices that are outside of the direct -child/parent relationship. A serial or network communication controller, which -could be a PCI device, may need to be able to get a reference to its PHY -component, which could be attached for example to the I2C bus. Some device -drivers need to be able to control the clocks or the GPIOs for their devices, -and so on. - -Device connections are generic descriptions of any type of connection between -two separate devices. - -Device connections alone do not create a dependency between the two devices. -They are only descriptions which are not tied to either of the devices directly. -A dependency between the two devices exists only if one of the two endpoint -devices requests a reference to the other. The descriptions themselves can be -defined in firmware (not yet supported) or they can be built-in. - -Usage ------ - -Device connections should exist before device ``->probe`` callback is called for -either endpoint device in the description. If the connections are defined in -firmware, this is not a problem. It should be considered if the connection -descriptions are "built-in", and need to be added separately. - -The connection description consists of the names of the two devices with the -connection, i.e. the endpoints, and unique identifier for the connection which -is needed if there are multiple connections between the two devices. - -After a description exists, the devices in it can request reference to the other -endpoint device, or they can request the description itself. - -API ---- - -.. kernel-doc:: drivers/base/devcon.c - :functions: device_connection_find_match device_connection_find device_connection_add device_connection_remove diff --git a/Documentation/driver-api/driver-model/devres.rst b/Documentation/driver-api/driver-model/devres.rst index eaaaafc21134..f318a5c0033c 100644 --- a/Documentation/driver-api/driver-model/devres.rst +++ b/Documentation/driver-api/driver-model/devres.rst @@ -354,6 +354,7 @@ MEM devm_kmalloc() devm_kmalloc_array() devm_kmemdup() + devm_krealloc() devm_kstrdup() devm_kvasprintf() devm_kzalloc() diff --git a/Documentation/driver-api/firmware/fallback-mechanisms.rst b/Documentation/driver-api/firmware/fallback-mechanisms.rst index 036383dad6d6..5f04c3bcdf0c 100644 --- a/Documentation/driver-api/firmware/fallback-mechanisms.rst +++ b/Documentation/driver-api/firmware/fallback-mechanisms.rst @@ -42,6 +42,7 @@ fallback mechanism: supported for request_firmware_into_buf(). * Firmware is not accessible through typical means: + * It cannot be installed into the root filesystem * The firmware provides very unique device specific data tailored for the unit gathered with local information. An example is calibration diff --git a/Documentation/driver-api/index.rst b/Documentation/driver-api/index.rst index 5ef2cfe3a16b..6e7c702e0268 100644 --- a/Documentation/driver-api/index.rst +++ b/Documentation/driver-api/index.rst @@ -22,7 +22,6 @@ available subsections can be seen below. pm/index clk device-io - device_connection dma-buf device_link component diff --git a/MAINTAINERS b/MAINTAINERS index 0d0862b19ce5..902b92c2d323 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -5012,6 +5012,12 @@ S: Maintained F: drivers/base/devcoredump.c F: include/linux/devcoredump.h +DEVICE DEPENDENCY HELPER SCRIPT +M: Saravana Kannan <saravanak@google.com> +L: linux-kernel@vger.kernel.org +S: Maintained +F: scripts/dev-needs.sh + DEVICE DIRECT ACCESS (DAX) M: Dan Williams <dan.j.williams@intel.com> M: Vishal Verma <vishal.l.verma@intel.com> diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 157452080f3d..41369fc7004f 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -6,7 +6,7 @@ obj-y := component.o core.o bus.o dd.o syscore.o \ cpu.o firmware.o init.o map.o devres.o \ attribute_container.o transport_class.o \ topology.o container.o property.o cacheinfo.o \ - devcon.o swnode.o + swnode.o obj-$(CONFIG_DEVTMPFS) += devtmpfs.o obj-y += power/ obj-$(CONFIG_ISA_BUS_API) += isa.o diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 857b0a928e8d..6e7319ca5bde 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -658,15 +658,14 @@ done: */ static int really_probe_debug(struct device *dev, struct device_driver *drv) { - ktime_t calltime, delta, rettime; + ktime_t calltime, rettime; int ret; calltime = ktime_get(); ret = really_probe(dev, drv); rettime = ktime_get(); - delta = ktime_sub(rettime, calltime); pr_debug("probe of %s returned %d after %lld usecs\n", - dev_name(dev), ret, (s64) ktime_to_us(delta)); + dev_name(dev), ret, ktime_us_delta(rettime, calltime)); return ret; } diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c deleted file mode 100644 index 14e2178e09f8..000000000000 --- a/drivers/base/devcon.c +++ /dev/null @@ -1,231 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/** - * Device connections - * - * Copyright (C) 2018 Intel Corporation - * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com> - */ - -#include <linux/device.h> -#include <linux/property.h> - -static DEFINE_MUTEX(devcon_lock); -static LIST_HEAD(devcon_list); - -static void * -fwnode_graph_devcon_match(struct fwnode_handle *fwnode, const char *con_id, - void *data, devcon_match_fn_t match) -{ - struct device_connection con = { .id = con_id }; - struct fwnode_handle *ep; - void *ret; - - fwnode_graph_for_each_endpoint(fwnode, ep) { - con.fwnode = fwnode_graph_get_remote_port_parent(ep); - if (!fwnode_device_is_available(con.fwnode)) - continue; - - ret = match(&con, -1, data); - fwnode_handle_put(con.fwnode); - if (ret) { - fwnode_handle_put(ep); - return ret; - } - } - return NULL; -} - -static void * -fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id, - void *data, devcon_match_fn_t match) -{ - struct device_connection con = { }; - void *ret; - int i; - - for (i = 0; ; i++) { - con.fwnode = fwnode_find_reference(fwnode, con_id, i); - if (IS_ERR(con.fwnode)) - break; - - ret = match(&con, -1, data); - fwnode_handle_put(con.fwnode); - if (ret) - return ret; - } - - return NULL; -} - -/** - * fwnode_connection_find_match - Find connection from a device node - * @fwnode: Device node with the connection - * @con_id: Identifier for the connection - * @data: Data for the match function - * @match: Function to check and convert the connection description - * - * Find a connection with unique identifier @con_id between @fwnode and another - * device node. @match will be used to convert the connection description to - * data the caller is expecting to be returned. - */ -void *fwnode_connection_find_match(struct fwnode_handle *fwnode, - const char *con_id, void *data, - devcon_match_fn_t match) -{ - void *ret; - - if (!fwnode || !match) - return NULL; - - ret = fwnode_graph_devcon_match(fwnode, con_id, data, match); - if (ret) - return ret; - - return fwnode_devcon_match(fwnode, con_id, data, match); -} -EXPORT_SYMBOL_GPL(fwnode_connection_find_match); - -/** - * device_connection_find_match - Find physical connection to a device - * @dev: Device with the connection - * @con_id: Identifier for the connection - * @data: Data for the match function - * @match: Function to check and convert the connection description - * - * Find a connection with unique identifier @con_id between @dev and another - * device. @match will be used to convert the connection description to data the - * caller is expecting to be returned. - */ -void *device_connection_find_match(struct device *dev, const char *con_id, - void *data, devcon_match_fn_t match) -{ - struct fwnode_handle *fwnode = dev_fwnode(dev); - const char *devname = dev_name(dev); - struct device_connection *con; - void *ret = NULL; - int ep; - - if (!match) - return NULL; - - ret = fwnode_connection_find_match(fwnode, con_id, data, match); - if (ret) - return ret; - - mutex_lock(&devcon_lock); - - list_for_each_entry(con, &devcon_list, list) { - ep = match_string(con->endpoint, 2, devname); - if (ep < 0) - continue; - - if (con_id && strcmp(con->id, con_id)) - continue; - - ret = match(con, !ep, data); - if (ret) - break; - } - - mutex_unlock(&devcon_lock); - - return ret; -} -EXPORT_SYMBOL_GPL(device_connection_find_match); - -extern struct bus_type platform_bus_type; -extern struct bus_type pci_bus_type; -extern struct bus_type i2c_bus_type; -extern struct bus_type spi_bus_type; - -static struct bus_type *generic_match_buses[] = { - &platform_bus_type, -#ifdef CONFIG_PCI - &pci_bus_type, -#endif -#ifdef CONFIG_I2C - &i2c_bus_type, -#endif -#ifdef CONFIG_SPI_MASTER - &spi_bus_type, -#endif - NULL, -}; - -static void *device_connection_fwnode_match(struct device_connection *con) -{ - struct bus_type *bus; - struct device *dev; - - for (bus = generic_match_buses[0]; bus; bus++) { - dev = bus_find_device_by_fwnode(bus, con->fwnode); - if (dev && !strncmp(dev_name(dev), con->id, strlen(con->id))) - return dev; - - put_device(dev); - } - return NULL; -} - -/* This tries to find the device from the most common bus types by name. */ -static void *generic_match(struct device_connection *con, int ep, void *data) -{ - struct bus_type *bus; - struct device *dev; - - if (con->fwnode) - return device_connection_fwnode_match(con); - - for (bus = generic_match_buses[0]; bus; bus++) { - dev = bus_find_device_by_name(bus, NULL, con->endpoint[ep]); - if (dev) - return dev; - } - - /* - * We only get called if a connection was found, tell the caller to - * wait for the other device to show up. - */ - return ERR_PTR(-EPROBE_DEFER); -} - -/** - * device_connection_find - Find two devices connected together - * @dev: Device with the connection - * @con_id: Identifier for the connection - * - * Find a connection with unique identifier @con_id between @dev and - * another device. On success returns handle to the device that is connected - * to @dev, with the reference count for the found device incremented. Returns - * NULL if no matching connection was found, or ERR_PTR(-EPROBE_DEFER) when a - * connection was found but the other device has not been enumerated yet. - */ -struct device *device_connection_find(struct device *dev, const char *con_id) -{ - return device_connection_find_match(dev, con_id, NULL, generic_match); -} -EXPORT_SYMBOL_GPL(device_connection_find); - -/** - * device_connection_add - Register a connection description - * @con: The connection description to be registered - */ -void device_connection_add(struct device_connection *con) -{ - mutex_lock(&devcon_lock); - list_add_tail(&con->list, &devcon_list); - mutex_unlock(&devcon_lock); -} -EXPORT_SYMBOL_GPL(device_connection_add); - -/** - * device_connections_remove - Unregister connection description - * @con: The connection description to be unregistered - */ -void device_connection_remove(struct device_connection *con) -{ - mutex_lock(&devcon_lock); - list_del(&con->list); - mutex_unlock(&devcon_lock); -} -EXPORT_SYMBOL_GPL(device_connection_remove); diff --git a/drivers/base/devres.c b/drivers/base/devres.c index ed615d3b9cf1..586e9a75c840 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -126,6 +126,14 @@ static void add_dr(struct device *dev, struct devres_node *node) list_add_tail(&node->entry, &dev->devres_head); } +static void replace_dr(struct device *dev, + struct devres_node *old, struct devres_node *new) +{ + devres_log(dev, old, "REPLACE"); + BUG_ON(!list_empty(&new->entry)); + list_replace(&old->entry, &new->entry); +} + #ifdef CONFIG_DEBUG_DEVRES void * __devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp, int nid, const char *name) @@ -838,6 +846,103 @@ void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) EXPORT_SYMBOL_GPL(devm_kmalloc); /** + * devm_krealloc - Resource-managed krealloc() + * @dev: Device to re-allocate memory for + * @ptr: Pointer to the memory chunk to re-allocate + * @new_size: New allocation size + * @gfp: Allocation gfp flags + * + * Managed krealloc(). Resizes the memory chunk allocated with devm_kmalloc(). + * Behaves similarly to regular krealloc(): if @ptr is NULL or ZERO_SIZE_PTR, + * it's the equivalent of devm_kmalloc(). If new_size is zero, it frees the + * previously allocated memory and returns ZERO_SIZE_PTR. This function doesn't + * change the order in which the release callback for the re-alloc'ed devres + * will be called (except when falling back to devm_kmalloc() or when freeing + * resources when new_size is zero). The contents of the memory are preserved + * up to the lesser of new and old sizes. + */ +void *devm_krealloc(struct device *dev, void *ptr, size_t new_size, gfp_t gfp) +{ + size_t total_new_size, total_old_size; + struct devres *old_dr, *new_dr; + unsigned long flags; + + if (unlikely(!new_size)) { + devm_kfree(dev, ptr); + return ZERO_SIZE_PTR; + } + + if (unlikely(ZERO_OR_NULL_PTR(ptr))) + return devm_kmalloc(dev, new_size, gfp); + + if (WARN_ON(is_kernel_rodata((unsigned long)ptr))) + /* + * We cannot reliably realloc a const string returned by + * devm_kstrdup_const(). + */ + return NULL; + + if (!check_dr_size(new_size, &total_new_size)) + return NULL; + + total_old_size = ksize(container_of(ptr, struct devres, data)); + if (total_old_size == 0) { + WARN(1, "Pointer doesn't point to dynamically allocated memory."); + return NULL; + } + + /* + * If new size is smaller or equal to the actual number of bytes + * allocated previously - just return the same pointer. + */ + if (total_new_size <= total_old_size) + return ptr; + + /* + * Otherwise: allocate new, larger chunk. We need to allocate before + * taking the lock as most probably the caller uses GFP_KERNEL. + */ + new_dr = alloc_dr(devm_kmalloc_release, + total_new_size, gfp, dev_to_node(dev)); + if (!new_dr) + return NULL; + + /* + * The spinlock protects the linked list against concurrent + * modifications but not the resource itself. + */ + spin_lock_irqsave(&dev->devres_lock, flags); + + old_dr = find_dr(dev, devm_kmalloc_release, devm_kmalloc_match, ptr); + if (!old_dr) { + spin_unlock_irqrestore(&dev->devres_lock, flags); + kfree(new_dr); + WARN(1, "Memory chunk not managed or managed by a different device."); + return NULL; + } + + replace_dr(dev, &old_dr->node, &new_dr->node); + + spin_unlock_irqrestore(&dev->devres_lock, flags); + + /* + * We can copy the memory contents after releasing the lock as we're + * no longer modyfing the list links. + */ + memcpy(new_dr->data, old_dr->data, + total_old_size - offsetof(struct devres, data)); + /* + * Same for releasing the old devres - it's now been removed from the + * list. This is also the reason why we must not use devm_kfree() - the + * links are no longer valid. + */ + kfree(old_dr); + + return new_dr->data; +} +EXPORT_SYMBOL_GPL(devm_krealloc); + +/** * devm_kstrdup - Allocate resource managed space and * copy an existing string into that. * @dev: Device to allocate memory for diff --git a/drivers/base/platform.c b/drivers/base/platform.c index e5d8a0503b4f..d90d92e63903 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -45,6 +45,8 @@ EXPORT_SYMBOL_GPL(platform_bus); * @dev: platform device * @type: resource type * @num: resource index + * + * Return: a pointer to the resource or NULL on failure. */ struct resource *platform_get_resource(struct platform_device *dev, unsigned int type, unsigned int num) @@ -70,6 +72,9 @@ EXPORT_SYMBOL_GPL(platform_get_resource); * resource management * @index: resource index * @res: optional output parameter to store a pointer to the obtained resource. + * + * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code + * on failure. */ void __iomem * devm_platform_get_and_ioremap_resource(struct platform_device *pdev, @@ -91,6 +96,9 @@ EXPORT_SYMBOL_GPL(devm_platform_get_and_ioremap_resource); * @pdev: platform device to use both for memory resource lookup as well as * resource management * @index: resource index + * + * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code + * on failure. */ void __iomem *devm_platform_ioremap_resource(struct platform_device *pdev, unsigned int index) @@ -106,6 +114,9 @@ EXPORT_SYMBOL_GPL(devm_platform_ioremap_resource); * @pdev: platform device to use both for memory resource lookup as well as * resource management * @index: resource index + * + * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code + * on failure. */ void __iomem *devm_platform_ioremap_resource_wc(struct platform_device *pdev, unsigned int index) @@ -124,6 +135,9 @@ void __iomem *devm_platform_ioremap_resource_wc(struct platform_device *pdev, * @pdev: platform device to use both for memory resource lookup as well as * resource management * @name: name of the resource + * + * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code + * on failure. */ void __iomem * devm_platform_ioremap_resource_byname(struct platform_device *pdev, @@ -559,7 +573,7 @@ int platform_device_add(struct platform_device *pdev) * that we remember it must be freed, and we append a suffix * to avoid namespace collision with explicit IDs. */ - ret = ida_simple_get(&platform_devid_ida, 0, 0, GFP_KERNEL); + ret = ida_alloc(&platform_devid_ida, GFP_KERNEL); if (ret < 0) goto err_out; pdev->id = ret; @@ -600,7 +614,7 @@ int platform_device_add(struct platform_device *pdev) failed: if (pdev->id_auto) { - ida_simple_remove(&platform_devid_ida, pdev->id); + ida_free(&platform_devid_ida, pdev->id); pdev->id = PLATFORM_DEVID_AUTO; } @@ -631,7 +645,7 @@ void platform_device_del(struct platform_device *pdev) device_del(&pdev->dev); if (pdev->id_auto) { - ida_simple_remove(&platform_devid_ida, pdev->id); + ida_free(&platform_devid_ida, pdev->id); pdev->id = PLATFORM_DEVID_AUTO; } diff --git a/drivers/base/property.c b/drivers/base/property.c index d58aa98fe964..4c43d30145c6 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -1184,3 +1184,76 @@ const void *device_get_match_data(struct device *dev) return fwnode_call_ptr_op(dev_fwnode(dev), device_get_match_data, dev); } EXPORT_SYMBOL_GPL(device_get_match_data); + +static void * +fwnode_graph_devcon_match(struct fwnode_handle *fwnode, const char *con_id, + void *data, devcon_match_fn_t match) +{ + struct fwnode_handle *node; + struct fwnode_handle *ep; + void *ret; + + fwnode_graph_for_each_endpoint(fwnode, ep) { + node = fwnode_graph_get_remote_port_parent(ep); + if (!fwnode_device_is_available(node)) + continue; + + ret = match(node, con_id, data); + fwnode_handle_put(node); + if (ret) { + fwnode_handle_put(ep); + return ret; + } + } + return NULL; +} + +static void * +fwnode_devcon_match(struct fwnode_handle *fwnode, const char *con_id, + void *data, devcon_match_fn_t match) +{ + struct fwnode_handle *node; + void *ret; + int i; + + for (i = 0; ; i++) { + node = fwnode_find_reference(fwnode, con_id, i); + if (IS_ERR(node)) + break; + + ret = match(node, NULL, data); + fwnode_handle_put(node); + if (ret) + return ret; + } + + return NULL; +} + +/** + * fwnode_connection_find_match - Find connection from a device node + * @fwnode: Device node with the connection + * @con_id: Identifier for the connection + * @data: Data for the match function + * @match: Function to check and convert the connection description + * + * Find a connection with unique identifier @con_id between @fwnode and another + * device node. @match will be used to convert the connection description to + * data the caller is expecting to be returned. + */ +void *fwnode_connection_find_match(struct fwnode_handle *fwnode, + const char *con_id, void *data, + devcon_match_fn_t match) +{ + void *ret; + + if (!fwnode || !match) + return NULL; + + ret = fwnode_graph_devcon_match(fwnode, con_id, data, match); + if (ret) + return ret; + + return fwnode_devcon_match(fwnode, con_id, data, match); +} +EXPORT_SYMBOL_GPL(fwnode_connection_find_match); diff --git a/drivers/base/syscore.c b/drivers/base/syscore.c index 0d346a307140..13db1f78d2ce 100644 --- a/drivers/base/syscore.c +++ b/drivers/base/syscore.c @@ -50,7 +50,7 @@ int syscore_suspend(void) int ret = 0; trace_suspend_resume(TPS("syscore_suspend"), 0, true); - pr_debug("Checking wakeup interrupts\n"); + pm_pr_dbg("Checking wakeup interrupts\n"); /* Return error code if there are any wakeup interrupts pending. */ if (pm_wakeup_pending()) @@ -61,8 +61,7 @@ int syscore_suspend(void) list_for_each_entry_reverse(ops, &syscore_ops_list, node) if (ops->suspend) { - if (initcall_debug) - pr_info("PM: Calling %pS\n", ops->suspend); + pm_pr_dbg("Calling %pS\n", ops->suspend); ret = ops->suspend(); if (ret) goto err_out; @@ -99,8 +98,7 @@ void syscore_resume(void) list_for_each_entry(ops, &syscore_ops_list, node) if (ops->resume) { - if (initcall_debug) - pr_info("PM: Calling %pS\n", ops->resume); + pm_pr_dbg("Calling %pS\n", ops->resume); ops->resume(); WARN_ONCE(!irqs_disabled(), "Interrupts enabled after %pS\n", ops->resume); diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c index 44535add3a4a..91839979cf6c 100644 --- a/drivers/hwmon/pmbus/pmbus_core.c +++ b/drivers/hwmon/pmbus/pmbus_core.c @@ -1018,9 +1018,9 @@ static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr) { if (data->num_attributes >= data->max_attributes - 1) { int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE; - void *new_attrs = krealloc(data->group.attrs, - new_max_attrs * sizeof(void *), - GFP_KERNEL); + void *new_attrs = devm_krealloc(data->dev, data->group.attrs, + new_max_attrs * sizeof(void *), + GFP_KERNEL); if (!new_attrs) return -ENOMEM; data->group.attrs = new_attrs; @@ -2534,7 +2534,7 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id, ret = pmbus_find_attributes(client, data); if (ret) - goto out_kfree; + return ret; /* * If there are no attributes, something is wrong. @@ -2542,35 +2542,27 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id, */ if (!data->num_attributes) { dev_err(dev, "No attributes found\n"); - ret = -ENODEV; - goto out_kfree; + return -ENODEV; } data->groups[0] = &data->group; memcpy(data->groups + 1, info->groups, sizeof(void *) * groups_num); - data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name, - data, data->groups); + data->hwmon_dev = devm_hwmon_device_register_with_groups(dev, + client->name, data, data->groups); if (IS_ERR(data->hwmon_dev)) { - ret = PTR_ERR(data->hwmon_dev); dev_err(dev, "Failed to register hwmon device\n"); - goto out_kfree; + return PTR_ERR(data->hwmon_dev); } ret = pmbus_regulator_register(data); if (ret) - goto out_unregister; + return ret; ret = pmbus_init_debugfs(client, data); if (ret) dev_warn(dev, "Failed to register debugfs\n"); return 0; - -out_unregister: - hwmon_device_unregister(data->hwmon_dev); -out_kfree: - kfree(data->group.attrs); - return ret; } EXPORT_SYMBOL_GPL(pmbus_do_probe); @@ -2580,8 +2572,6 @@ int pmbus_do_remove(struct i2c_client *client) debugfs_remove_recursive(data->debugfs); - hwmon_device_unregister(data->hwmon_dev); - kfree(data->group.attrs); return 0; } EXPORT_SYMBOL_GPL(pmbus_do_remove); diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c index d0b7ef296afb..f93c34fe5873 100644 --- a/drivers/iio/adc/xilinx-xadc-core.c +++ b/drivers/iio/adc/xilinx-xadc-core.c @@ -1092,6 +1092,7 @@ MODULE_DEVICE_TABLE(of, xadc_of_match_table); static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np, unsigned int *conf) { + struct device *dev = indio_dev->dev.parent; struct xadc *xadc = iio_priv(indio_dev); struct iio_chan_spec *channels, *chan; struct device_node *chan_node, *child; @@ -1136,7 +1137,8 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np, *conf |= XADC_CONF0_MUX | XADC_CONF0_CHAN(ext_mux_chan); } - channels = kmemdup(xadc_channels, sizeof(xadc_channels), GFP_KERNEL); + channels = devm_kmemdup(dev, xadc_channels, + sizeof(xadc_channels), GFP_KERNEL); if (!channels) return -ENOMEM; @@ -1172,8 +1174,9 @@ static int xadc_parse_dt(struct iio_dev *indio_dev, struct device_node *np, of_node_put(chan_node); indio_dev->num_channels = num_channels; - indio_dev->channels = krealloc(channels, sizeof(*channels) * - num_channels, GFP_KERNEL); + indio_dev->channels = devm_krealloc(dev, channels, + sizeof(*channels) * num_channels, + GFP_KERNEL); /* If we can't resize the channels array, just use the original */ if (!indio_dev->channels) indio_dev->channels = channels; @@ -1225,14 +1228,14 @@ static int xadc_probe(struct platform_device *pdev) ret = xadc_parse_dt(indio_dev, pdev->dev.of_node, &conf0); if (ret) - goto err_device_free; + return ret; if (xadc->ops->flags & XADC_FLAGS_BUFFERED) { ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time, &xadc_trigger_handler, &xadc_buffer_ops); if (ret) - goto err_device_free; + return ret; xadc->convst_trigger = xadc_alloc_trigger(indio_dev, "convst"); if (IS_ERR(xadc->convst_trigger)) { @@ -1350,8 +1353,6 @@ err_free_convst_trigger: err_triggered_buffer_cleanup: if (xadc->ops->flags & XADC_FLAGS_BUFFERED) iio_triggered_buffer_cleanup(indio_dev); -err_device_free: - kfree(indio_dev->channels); return ret; } @@ -1371,7 +1372,6 @@ static int xadc_remove(struct platform_device *pdev) cancel_delayed_work_sync(&xadc->zynq_unmask_work); clk_disable_unprepare(xadc->clk); kfree(xadc->data); - kfree(indio_dev->channels); return 0; } diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index 27d92af29635..97f37077b7f9 100644 --- a/drivers/usb/roles/class.c +++ b/drivers/usb/roles/class.c @@ -87,19 +87,15 @@ enum usb_role usb_role_switch_get_role(struct usb_role_switch *sw) } EXPORT_SYMBOL_GPL(usb_role_switch_get_role); -static void *usb_role_switch_match(struct device_connection *con, int ep, +static void *usb_role_switch_match(struct fwnode_handle *fwnode, const char *id, void *data) { struct device *dev; - if (con->fwnode) { - if (con->id && !fwnode_property_present(con->fwnode, con->id)) - return NULL; + if (id && !fwnode_property_present(fwnode, id)) + return NULL; - dev = class_find_device_by_fwnode(role_class, con->fwnode); - } else { - dev = class_find_device_by_name(role_class, con->endpoint[ep]); - } + dev = class_find_device_by_fwnode(role_class, fwnode); return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER); } diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c index 52ad277e4565..b069a5122aaa 100644 --- a/drivers/usb/typec/mux.c +++ b/drivers/usb/typec/mux.c @@ -34,15 +34,15 @@ static int switch_fwnode_match(struct device *dev, const void *fwnode) return dev_fwnode(dev) == fwnode && dev_name_ends_with(dev, "-switch"); } -static void *typec_switch_match(struct device_connection *con, int ep, +static void *typec_switch_match(struct fwnode_handle *fwnode, const char *id, void *data) { struct device *dev; - if (con->id && !fwnode_property_present(con->fwnode, con->id)) + if (id && !fwnode_property_present(fwnode, id)) return NULL; - dev = class_find_device(&typec_mux_class, NULL, con->fwnode, + dev = class_find_device(&typec_mux_class, NULL, fwnode, switch_fwnode_match); return dev ? to_typec_switch(dev) : ERR_PTR(-EPROBE_DEFER); @@ -183,7 +183,8 @@ static int mux_fwnode_match(struct device *dev, const void *fwnode) return dev_fwnode(dev) == fwnode && dev_name_ends_with(dev, "-mux"); } -static void *typec_mux_match(struct device_connection *con, int ep, void *data) +static void *typec_mux_match(struct fwnode_handle *fwnode, const char *id, + void *data) { const struct typec_altmode_desc *desc = data; struct device *dev; @@ -196,20 +197,20 @@ static void *typec_mux_match(struct device_connection *con, int ep, void *data) * Check has the identifier already been "consumed". If it * has, no need to do any extra connection identification. */ - match = !con->id; + match = !id; if (match) goto find_mux; /* Accessory Mode muxes */ if (!desc) { - match = fwnode_property_present(con->fwnode, "accessory"); + match = fwnode_property_present(fwnode, "accessory"); if (match) goto find_mux; return NULL; } /* Alternate Mode muxes */ - nval = fwnode_property_count_u16(con->fwnode, "svid"); + nval = fwnode_property_count_u16(fwnode, "svid"); if (nval <= 0) return NULL; @@ -217,7 +218,7 @@ static void *typec_mux_match(struct device_connection *con, int ep, void *data) if (!val) return ERR_PTR(-ENOMEM); - nval = fwnode_property_read_u16_array(con->fwnode, "svid", val, nval); + nval = fwnode_property_read_u16_array(fwnode, "svid", val, nval); if (nval < 0) { kfree(val); return ERR_PTR(nval); @@ -234,7 +235,7 @@ static void *typec_mux_match(struct device_connection *con, int ep, void *data) return NULL; find_mux: - dev = class_find_device(&typec_mux_class, NULL, con->fwnode, + dev = class_find_device(&typec_mux_class, NULL, fwnode, mux_fwnode_match); return dev ? to_typec_switch(dev) : ERR_PTR(-EPROBE_DEFER); diff --git a/include/linux/device.h b/include/linux/device.h index 9e6ea8931a52..a8e3a86e35f6 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -206,6 +206,8 @@ int devres_release_group(struct device *dev, void *id); /* managed devm_k.alloc/kfree for device drivers */ void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc; +void *devm_krealloc(struct device *dev, void *ptr, size_t size, + gfp_t gfp) __must_check; __printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt, va_list ap) __malloc; __printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp, @@ -293,62 +295,6 @@ struct device_dma_parameters { }; /** - * struct device_connection - Device Connection Descriptor - * @fwnode: The device node of the connected device - * @endpoint: The names of the two devices connected together - * @id: Unique identifier for the connection - * @list: List head, private, for internal use only - * - * NOTE: @fwnode is not used together with @endpoint. @fwnode is used when - * platform firmware defines the connection. When the connection is registered - * with device_connection_add() @endpoint is used instead. - */ -struct device_connection { - struct fwnode_handle *fwnode; - const char *endpoint[2]; - const char *id; - struct list_head list; -}; - -typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep, - void *data); - -void *fwnode_connection_find_match(struct fwnode_handle *fwnode, - const char *con_id, void *data, - devcon_match_fn_t match); -void *device_connection_find_match(struct device *dev, const char *con_id, - void *data, devcon_match_fn_t match); - -struct device *device_connection_find(struct device *dev, const char *con_id); - -void device_connection_add(struct device_connection *con); -void device_connection_remove(struct device_connection *con); - -/** - * device_connections_add - Add multiple device connections at once - * @cons: Zero terminated array of device connection descriptors - */ -static inline void device_connections_add(struct device_connection *cons) -{ - struct device_connection *c; - - for (c = cons; c->endpoint[0]; c++) - device_connection_add(c); -} - -/** - * device_connections_remove - Remove multiple device connections at once - * @cons: Zero terminated array of device connection descriptors - */ -static inline void device_connections_remove(struct device_connection *cons) -{ - struct device_connection *c; - - for (c = cons; c->endpoint[0]; c++) - device_connection_remove(c); -} - -/** * enum device_link_state - Device link states. * @DL_STATE_NONE: The presence of the drivers is not being tracked. * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present. diff --git a/include/linux/property.h b/include/linux/property.h index 9f805c442819..aedae94dcf41 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -418,6 +418,20 @@ fwnode_graph_get_endpoint_by_id(const struct fwnode_handle *fwnode, int fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode, struct fwnode_endpoint *endpoint); +typedef void *(*devcon_match_fn_t)(struct fwnode_handle *fwnode, const char *id, + void *data); + +void *fwnode_connection_find_match(struct fwnode_handle *fwnode, + const char *con_id, void *data, + devcon_match_fn_t match); + +static inline void *device_connection_find_match(struct device *dev, + const char *con_id, void *data, + devcon_match_fn_t match) +{ + return fwnode_connection_find_match(dev_fwnode(dev), con_id, data, match); +} + /* -------------------------------------------------------------------------- */ /* Software fwnode support - when HW description is incomplete or missing */ diff --git a/lib/devres.c b/lib/devres.c index ebb1573d9ae3..2a4ff5d64288 100644 --- a/lib/devres.c +++ b/lib/devres.c @@ -162,13 +162,15 @@ __devm_ioremap_resource(struct device *dev, const struct resource *res, * region and ioremaps it. All operations are managed and will be undone * on driver detach. * - * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code - * on failure. Usage example: + * Usage example: * * res = platform_get_resource(pdev, IORESOURCE_MEM, 0); * base = devm_ioremap_resource(&pdev->dev, res); * if (IS_ERR(base)) * return PTR_ERR(base); + * + * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code + * on failure. */ void __iomem *devm_ioremap_resource(struct device *dev, const struct resource *res) @@ -183,8 +185,8 @@ EXPORT_SYMBOL(devm_ioremap_resource); * @dev: generic device to handle the resource for * @res: resource to be handled * - * Returns a pointer to the remapped memory or an ERR_PTR() encoded error code - * on failure. Usage example: + * Return: a pointer to the remapped memory or an ERR_PTR() encoded error code + * on failure. */ void __iomem *devm_ioremap_resource_wc(struct device *dev, const struct resource *res) @@ -207,8 +209,8 @@ void __iomem *devm_ioremap_resource_wc(struct device *dev, * @node: The device-tree node where the resource resides * @index: index of the MMIO range in the "reg" property * @size: Returns the size of the resource (pass NULL if not needed) - * Returns a pointer to the requested and mapped memory or an ERR_PTR() encoded - * error code on failure. Usage example: + * + * Usage example: * * base = devm_of_iomap(&pdev->dev, node, 0, NULL); * if (IS_ERR(base)) @@ -217,8 +219,10 @@ void __iomem *devm_ioremap_resource_wc(struct device *dev, * Please Note: This is not a one-to-one replacement for of_iomap() because the * of_iomap() function does not track whether the region is already mapped. If * two drivers try to map the same memory, the of_iomap() function will succeed - * but the the devm_of_iomap() function will return -EBUSY. + * but the devm_of_iomap() function will return -EBUSY. * + * Return: a pointer to the requested and mapped memory or an ERR_PTR() encoded + * error code on failure. */ void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index, resource_size_t *size) @@ -256,6 +260,8 @@ static int devm_ioport_map_match(struct device *dev, void *res, * * Managed ioport_map(). Map is automatically unmapped on driver * detach. + * + * Return: a pointer to the remapped memory or NULL on failure. */ void __iomem *devm_ioport_map(struct device *dev, unsigned long port, unsigned int nr) diff --git a/scripts/dev-needs.sh b/scripts/dev-needs.sh new file mode 100755 index 000000000000..454cc304fb44 --- /dev/null +++ b/scripts/dev-needs.sh @@ -0,0 +1,315 @@ +#! /bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2020, Google LLC. All rights reserved. +# Author: Saravana Kannan <saravanak@google.com> + +function help() { + cat << EOF +Usage: $(basename $0) [-c|-d|-m|-f] [filter options] <list of devices> + +This script needs to be run on the target device once it has booted to a +shell. + +The script takes as input a list of one or more device directories under +/sys/devices and then lists the probe dependency chain (suppliers and +parents) of these devices. It does a breadth first search of the dependency +chain, so the last entry in the output is close to the root of the +dependency chain. + +By default it lists the full path to the devices under /sys/devices. + +It also takes an optional modifier flag as the first parameter to change +what information is listed in the output. If the requested information is +not available, the device name is printed. + + -c lists the compatible string of the dependencies + -d lists the driver name of the dependencies that have probed + -m lists the module name of the dependencies that have a module + -f list the firmware node path of the dependencies + -g list the dependencies as edges and nodes for graphviz + -t list the dependencies as edges for tsort + +The filter options provide a way to filter out some dependencies: + --allow-no-driver By default dependencies that don't have a driver + attached are ignored. This is to avoid following + device links to "class" devices that are created + when the consumer probes (as in, not a probe + dependency). If you want to follow these links + anyway, use this flag. + + --exclude-devlinks Don't follow device links when tracking probe + dependencies. + + --exclude-parents Don't follow parent devices when tracking probe + dependencies. + +EOF +} + +function dev_to_detail() { + local i=0 + while [ $i -lt ${#OUT_LIST[@]} ] + do + local C=${OUT_LIST[i]} + local S=${OUT_LIST[i+1]} + local D="'$(detail_chosen $C $S)'" + if [ ! -z "$D" ] + then + # This weirdness is needed to work with toybox when + # using the -t option. + printf '%05u\t%s\n' ${i} "$D" | tr -d \' + fi + i=$((i+2)) + done +} + +function already_seen() { + local i=0 + while [ $i -lt ${#OUT_LIST[@]} ] + do + if [ "$1" = "${OUT_LIST[$i]}" ] + then + # if-statement treats 0 (no-error) as true + return 0 + fi + i=$(($i+2)) + done + + # if-statement treats 1 (error) as false + return 1 +} + +# Return 0 (no-error/true) if parent was added +function add_parent() { + + if [ ${ALLOW_PARENTS} -eq 0 ] + then + return 1 + fi + + local CON=$1 + # $CON could be a symlink path. So, we need to find the real path and + # then go up one level to find the real parent. + local PARENT=$(realpath $CON/..) + + while [ ! -e ${PARENT}/driver ] + do + if [ "$PARENT" = "/sys/devices" ] + then + return 1 + fi + PARENT=$(realpath $PARENT/..) + done + + CONSUMERS+=($PARENT) + OUT_LIST+=(${CON} ${PARENT}) + return 0 +} + +# Return 0 (no-error/true) if one or more suppliers were added +function add_suppliers() { + local CON=$1 + local RET=1 + + if [ ${ALLOW_DEVLINKS} -eq 0 ] + then + return 1 + fi + + SUPPLIER_LINKS=$(ls -1d $CON/supplier:* 2>/dev/null) + for SL in $SUPPLIER_LINKS; + do + SYNC_STATE=$(cat $SL/sync_state_only) + + # sync_state_only links are proxy dependencies. + # They can also have cycles. So, don't follow them. + if [ "$SYNC_STATE" != '0' ] + then + continue + fi + + SUPPLIER=$(realpath $SL/supplier) + + if [ ! -e $SUPPLIER/driver -a ${ALLOW_NO_DRIVER} -eq 0 ] + then + continue + fi + + CONSUMERS+=($SUPPLIER) + OUT_LIST+=(${CON} ${SUPPLIER}) + RET=0 + done + + return $RET +} + +function detail_compat() { + f=$1/of_node/compatible + if [ -e $f ] + then + echo -n $(cat $f) + else + echo -n $1 + fi +} + +function detail_module() { + f=$1/driver/module + if [ -e $f ] + then + echo -n $(basename $(realpath $f)) + else + echo -n $1 + fi +} + +function detail_driver() { + f=$1/driver + if [ -e $f ] + then + echo -n $(basename $(realpath $f)) + else + echo -n $1 + fi +} + +function detail_fwnode() { + f=$1/firmware_node + if [ ! -e $f ] + then + f=$1/of_node + fi + + if [ -e $f ] + then + echo -n $(realpath $f) + else + echo -n $1 + fi +} + +function detail_graphviz() { + if [ "$2" != "ROOT" ] + then + echo -n "\"$(basename $2)\"->\"$(basename $1)\"" + else + echo -n "\"$(basename $1)\"" + fi +} + +function detail_tsort() { + echo -n "\"$2\" \"$1\"" +} + +function detail_device() { echo -n $1; } + +alias detail=detail_device +ALLOW_NO_DRIVER=0 +ALLOW_DEVLINKS=1 +ALLOW_PARENTS=1 + +while [ $# -gt 0 ] +do + ARG=$1 + case $ARG in + --help) + help + exit 0 + ;; + -c) + alias detail=detail_compat + ;; + -m) + alias detail=detail_module + ;; + -d) + alias detail=detail_driver + ;; + -f) + alias detail=detail_fwnode + ;; + -g) + alias detail=detail_graphviz + ;; + -t) + alias detail=detail_tsort + ;; + --allow-no-driver) + ALLOW_NO_DRIVER=1 + ;; + --exclude-devlinks) + ALLOW_DEVLINKS=0 + ;; + --exclude-parents) + ALLOW_PARENTS=0 + ;; + *) + # Stop at the first argument that's not an option. + break + ;; + esac + shift +done + +function detail_chosen() { + detail $1 $2 +} + +if [ $# -eq 0 ] +then + help + exit 1 +fi + +CONSUMERS=($@) +OUT_LIST=() + +# Do a breadth first, non-recursive tracking of suppliers. The parent is also +# considered a "supplier" as a device can't probe without its parent. +i=0 +while [ $i -lt ${#CONSUMERS[@]} ] +do + CONSUMER=$(realpath ${CONSUMERS[$i]}) + i=$(($i+1)) + + if already_seen ${CONSUMER} + then + continue + fi + + # If this is not a device with a driver, we don't care about its + # suppliers. + if [ ! -e ${CONSUMER}/driver -a ${ALLOW_NO_DRIVER} -eq 0 ] + then + continue + fi + + ROOT=1 + + # Add suppliers to CONSUMERS list and output the consumer details. + # + # We don't need to worry about a cycle in the dependency chain causing + # infinite loops. That's because the kernel doesn't allow cycles in + # device links unless it's a sync_state_only device link. And we ignore + # sync_state_only device links inside add_suppliers. + if add_suppliers ${CONSUMER} + then + ROOT=0 + fi + + if add_parent ${CONSUMER} + then + ROOT=0 + fi + + if [ $ROOT -eq 1 ] + then + OUT_LIST+=(${CONSUMER} "ROOT") + fi +done + +# Can NOT combine sort and uniq using sort -suk2 because stable sort in toybox +# isn't really stable. +dev_to_detail | sort -k2 -k1 | uniq -f 1 | sort | cut -f2- + +exit 0 |