From 2bd30b8dc75b823dd7bbef9d7bc68e1fd7ecee5c Mon Sep 17 00:00:00 2001 From: Sang-Heon Jeon Date: Mon, 24 Aug 2026 01:18:14 +0900 Subject: coccinelle: alloc_cast: drop removed allocators - pci_alloc_consistent() and pci_zalloc_consistent() were removed by commit 7968778914e5 ("PCI: Remove the deprecated "pci-dma-compat.h" API") - kmem_alloc() was removed by commit f078d4ea8276 ("xfs: convert kmem_alloc() to kmalloc()") - kmem_zalloc() was removed by commit 10634530f7ba ("xfs: convert kmem_zalloc() to kzalloc()") - kmem_zone_alloc() and kmem_zone_zalloc() were removed by commit bae633a4a283 ("xfs: remove xfs_zone_{alloc,zalloc} helpers") So drop them from the rules. No functional change. Signed-off-by: Sang-Heon Jeon Signed-off-by: Julia Lawall --- drivers/of/device.c | 314 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 314 insertions(+) create mode 100644 drivers/of/device.c (limited to 'drivers/of/device.c') diff --git a/drivers/of/device.c b/drivers/of/device.c new file mode 100644 index 000000000..b3dc78f2f --- /dev/null +++ b/drivers/of/device.c @@ -0,0 +1,314 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include /* for bus_dma_region */ +#include +#include +#include +#include + +#include +#include "of_private.h" + +/** + * of_match_device - Tell if a struct device matches an of_device_id list + * @matches: array of of_device_id match structures to search in + * @dev: the OF device structure to match against + * + * Used by a driver to check whether an platform_device present in the + * system is in its list of supported devices. + */ +const struct of_device_id *of_match_device(const struct of_device_id *matches, + const struct device *dev) +{ + if (!matches || !dev->of_node || dev_of_node_reused(dev)) + return NULL; + return of_match_node(matches, dev->of_node); +} +EXPORT_SYMBOL(of_match_device); + +static void +of_dma_set_restricted_buffer(struct device *dev, struct device_node *np) +{ + struct device_node *of_node = dev->of_node; + struct of_phandle_iterator it; + int rc, i = 0; + + if (!IS_ENABLED(CONFIG_DMA_RESTRICTED_POOL)) + return; + + /* + * If dev->of_node doesn't exist or doesn't contain memory-region, try + * the OF node having DMA configuration. + */ + if (!of_property_present(of_node, "memory-region")) + of_node = np; + + of_for_each_phandle(&it, rc, of_node, "memory-region", NULL, 0) { + /* + * There might be multiple memory regions, but only one + * restricted-dma-pool region is allowed. + */ + if (of_device_is_compatible(it.node, "restricted-dma-pool") && + of_device_is_available(it.node)) { + if (of_reserved_mem_device_init_by_idx(dev, of_node, i)) + dev_warn(dev, "failed to initialise \"restricted-dma-pool\" memory node\n"); + of_node_put(it.node); + break; + } + i++; + } + +} + +/** + * of_dma_configure_id - Setup DMA configuration + * @dev: Device to apply DMA configuration + * @np: Pointer to OF node having DMA configuration + * @force_dma: Whether device is to be set up by of_dma_configure() even if + * DMA capability is not explicitly described by firmware. + * @id: Optional const pointer value input id + * + * Try to get devices's DMA configuration from DT and update it + * accordingly. + * + * If platform code needs to use its own special DMA configuration, it + * can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events + * to fix up DMA configuration. + */ +int of_dma_configure_id(struct device *dev, struct device_node *np, + bool force_dma, const u32 *id) +{ + const struct bus_dma_region *map = NULL; + struct device_node *bus_np; + u64 mask, end = 0; + bool coherent, set_map = false; + int ret; + + if (dev->dma_range_map) { + dev_dbg(dev, "dma_range_map already set\n"); + goto skip_map; + } + + if (np == dev->of_node) + bus_np = __of_get_dma_parent(np); + else + bus_np = of_node_get(np); + + ret = of_dma_get_range(bus_np, &map); + of_node_put(bus_np); + if (ret < 0) { + /* + * For legacy reasons, we have to assume some devices need + * DMA configuration regardless of whether "dma-ranges" is + * correctly specified or not. + */ + if (!force_dma) + return ret == -ENODEV ? 0 : ret; + } else { + /* Determine the overall bounds of all DMA regions */ + end = dma_range_map_max(map); + set_map = true; + } +skip_map: + /* + * If @dev is expected to be DMA-capable then the bus code that created + * it should have initialised its dma_mask pointer by this point. For + * now, we'll continue the legacy behaviour of coercing it to the + * coherent mask if not, but we'll no longer do so quietly. + */ + if (!dev->dma_mask) { + dev_warn(dev, "DMA mask not set\n"); + dev->dma_mask = &dev->coherent_dma_mask; + } + + if (!end && dev->coherent_dma_mask) + end = dev->coherent_dma_mask; + else if (!end) + end = (1ULL << 32) - 1; + + /* + * Limit coherent and dma mask based on size and default mask + * set by the driver. + */ + mask = DMA_BIT_MASK(ilog2(end) + 1); + dev->coherent_dma_mask &= mask; + *dev->dma_mask &= mask; + /* ...but only set bus limit and range map if we found valid dma-ranges earlier */ + if (set_map) { + dev->bus_dma_limit = end; + dev->dma_range_map = map; + } + + coherent = of_dma_is_coherent(np); + dev_dbg(dev, "device is%sdma coherent\n", + coherent ? " " : " not "); + + ret = of_iommu_configure(dev, np, id); + if (ret == -EPROBE_DEFER) { + /* Don't touch range map if it wasn't set from a valid dma-ranges */ + if (set_map) + dev->dma_range_map = NULL; + kfree(map); + return -EPROBE_DEFER; + } + /* Take all other IOMMU errors to mean we'll just carry on without it */ + dev_dbg(dev, "device is%sbehind an iommu\n", + !ret ? " " : " not "); + + arch_setup_dma_ops(dev, coherent); + + if (ret) + of_dma_set_restricted_buffer(dev, np); + + return 0; +} +EXPORT_SYMBOL_GPL(of_dma_configure_id); + +const void *of_device_get_match_data(const struct device *dev) +{ + const struct of_device_id *match; + + match = of_match_device(dev->driver->of_match_table, dev); + if (!match) + return NULL; + + return match->data; +} +EXPORT_SYMBOL(of_device_get_match_data); + +/** + * of_device_modalias - Fill buffer with newline terminated modalias string + * @dev: Calling device + * @str: Modalias string + * @len: Size of @str + */ +ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len) +{ + ssize_t sl; + + if (!dev || !dev->of_node || dev_of_node_reused(dev)) + return -ENODEV; + + sl = of_modalias(dev->of_node, str, len - 2); + if (sl < 0) + return sl; + if (sl > len - 2) + return -ENOMEM; + + str[sl++] = '\n'; + str[sl] = 0; + return sl; +} +EXPORT_SYMBOL_GPL(of_device_modalias); + +/** + * of_device_uevent - Display OF related uevent information + * @dev: Device to display the uevent information for + * @env: Kernel object's userspace event reference to fill up + */ +void of_device_uevent(const struct device *dev, struct kobj_uevent_env *env) +{ + const char *compat, *type; + struct alias_prop *app; + struct property *p; + int seen = 0; + + if ((!dev) || (!dev->of_node)) + return; + + add_uevent_var(env, "OF_NAME=%pOFn", dev->of_node); + add_uevent_var(env, "OF_FULLNAME=%pOF", dev->of_node); + type = of_node_get_device_type(dev->of_node); + if (type) + add_uevent_var(env, "OF_TYPE=%s", type); + + /* Since the compatible field can contain pretty much anything + * it's not really legal to split it out with commas. We split it + * up using a number of environment variables instead. */ + of_property_for_each_string(dev->of_node, "compatible", p, compat) { + add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat); + seen++; + } + add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen); + + seen = 0; + mutex_lock(&of_mutex); + list_for_each_entry(app, &aliases_lookup, link) { + if (dev->of_node == app->np) { + add_uevent_var(env, "OF_ALIAS_%d=%s", seen, + app->alias); + seen++; + } + } + mutex_unlock(&of_mutex); +} +EXPORT_SYMBOL_GPL(of_device_uevent); + +int of_device_uevent_modalias(const struct device *dev, struct kobj_uevent_env *env) +{ + int sl; + + if ((!dev) || (!dev->of_node) || dev_of_node_reused(dev)) + return -ENODEV; + + /* Devicetree modalias is tricky, we add it in 2 steps */ + if (add_uevent_var(env, "MODALIAS=")) + return -ENOMEM; + + sl = of_modalias(dev->of_node, &env->buf[env->buflen-1], + sizeof(env->buf) - env->buflen); + if (sl < 0) + return sl; + if (sl >= (sizeof(env->buf) - env->buflen)) + return -ENOMEM; + env->buflen += sl; + + return 0; +} +EXPORT_SYMBOL_GPL(of_device_uevent_modalias); + +/** + * of_device_make_bus_id - Use the device node data to assign a unique name + * @dev: pointer to device structure that is linked to a device tree node + * + * This routine will first try using the translated bus address to + * derive a unique name. If it cannot, then it will prepend names from + * parent nodes until a unique name can be derived. + */ +void of_device_make_bus_id(struct device *dev) +{ + struct device_node *node = dev->of_node; + const __be32 *reg; + u64 addr; + u32 mask; + + /* Construct the name, using parent nodes if necessary to ensure uniqueness */ + while (node->parent) { + /* + * If the address can be translated, then that is as much + * uniqueness as we need. Make it the first component and return + */ + reg = of_get_property(node, "reg", NULL); + if (reg && (addr = of_translate_address(node, reg)) != OF_BAD_ADDR) { + if (!of_property_read_u32(node, "mask", &mask)) + dev_set_name(dev, dev_name(dev) ? "%llx.%x.%pOFn:%s" : "%llx.%x.%pOFn", + addr, ffs(mask) - 1, node, dev_name(dev)); + + else + dev_set_name(dev, dev_name(dev) ? "%llx.%pOFn:%s" : "%llx.%pOFn", + addr, node, dev_name(dev)); + return; + } + + /* format arguments only used if dev_name() resolves to NULL */ + dev_set_name(dev, dev_name(dev) ? "%s:%s" : "%s", + kbasename(node->full_name), dev_name(dev)); + node = node->parent; + } +} +EXPORT_SYMBOL_GPL(of_device_make_bus_id); -- cgit v1.3.1