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/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