From cf9610f9116d55c5a66ef9f1faecacabd93a9322 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Mon, 24 Aug 2026 08:46:03 -0700 Subject: Merge tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl Pull pin control updates from Linus Walleij: "Core changes: - Use the non-blocking mux_state_try_select() in the generic MUX pin control back-end - Free pin maps on pinctrl_generic_to_map() failure in the core helpers New hardware pin control: - Qualcomm Maili TLMM SoC, PMG1110 PMIC, and Eliza LPASS LPI TLMM SoC (this is for the low power audio, LPASS = Low Power Audio SubSystem portions) - Upboard support on top of the Intel pin controller - Apple T6030 and T6031 support (just compatible strings) - Samsung Exynos 8855 SoC - Mediatek MT6858 SoC - Rockchip RK3308B and RV1106 SoCs - Airoha EN7523 and AN7563 SoCs Improvements: - Qualcomm TLMM GPIOs are unconditionally marked as wakeup capable - Qualcomm improvements on top of the Qualcomm PDC (power domain controller) irqchip improvements from tglx:s tree - Qualcomm IPQ806x and IPQ9650 non-urgent pin grop fixups - The NPCM8xx driver has been put into shape fixing many pin and group definitions - Some non-urgent Tegra 264 pin assignments are fixed up - Some non-urgent fixups to Airoha AN7581 and AN7583 registers and pin assignments, missing features etc" * tag 'pinctrl-v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (130 commits) dt-bindings: pinctrl: Convert TI DA850 pupd to DT schema pinctrl: meson: sync some modify from A4 pinctrl: meson: a4: Add input enable pin configuration pinctrl: realtek: rtd1625: remove unused group name spdif_sel pinctrl: realtek: rtd1625: fix base_bit for VE4 GPIO 13 dt-bindings: pinctrl: microchip,pic32mzda-pinctrl: Convert to DT schema Revert "Merge branch 'ib-rsk7204' into devel" pinctrl: rockchip: Add RV1106 pinctrl support dt-bindings: pinctrl: rockchip: Add RV1106 compatible pinctrl: rockchip: Decode drive strength in the get function pinctrl: fix PINCTRL_GENERIC_MUX not always being selectable pinctrl: airoha: add support of an7563 SoC dt-bindings: pinctrl: airoha: add support of an7563 pin controller pinctrl: airoha: try to find chip scu node by phandle first pinctrl: airoha: add support of en7523 SoC dt-bindings: pinctrl: airoha: add support of en7523 pin controller pinctrl: airoha: an7583: add support for olt pinmux pinctrl: airoha: an7583: add support for pon_alt pinmux pinctrl: airoha: an7583: add support for npu_uart pinmux dt-bindings: pinctrl: airoha: an7583: add missed features ... --- lib/objpool.c | 203 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 203 insertions(+) create mode 100644 lib/objpool.c (limited to 'lib/objpool.c') diff --git a/lib/objpool.c b/lib/objpool.c new file mode 100644 index 000000000..d98fadf1d --- /dev/null +++ b/lib/objpool.c @@ -0,0 +1,203 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include +#include + +/* + * objpool: ring-array based lockless MPMC/FIFO queues + * + * Copyright: wuqiang.matt@bytedance.com,mhiramat@kernel.org + */ + +/* initialize percpu objpool_slot */ +static int +objpool_init_percpu_slot(struct objpool_head *pool, + struct objpool_slot *slot, + int nodes, void *context, + objpool_init_obj_cb objinit) +{ + void *obj = (void *)&slot->entries[pool->capacity]; + int i; + + /* initialize elements of percpu objpool_slot */ + slot->mask = pool->capacity - 1; + + for (i = 0; i < nodes; i++) { + if (objinit) { + int rc = objinit(obj, context); + if (rc) + return rc; + } + slot->entries[slot->tail & slot->mask] = obj; + obj = obj + pool->obj_size; + slot->tail++; + slot->last = slot->tail; + pool->nr_objs++; + } + + return 0; +} + +/* allocate and initialize percpu slots */ +static int +objpool_init_percpu_slots(struct objpool_head *pool, int nr_objs, + void *context, objpool_init_obj_cb objinit) +{ + int i, cpu_count = 0; + + for (i = 0; i < nr_cpu_ids; i++) { + + struct objpool_slot *slot; + int nodes, size, rc; + + /* skip the cpu node which could never be present */ + if (!cpu_possible(i)) + continue; + + /* compute how many objects to be allocated with this slot */ + nodes = nr_objs / pool->nr_possible_cpus; + if (cpu_count < (nr_objs % pool->nr_possible_cpus)) + nodes++; + cpu_count++; + + size = struct_size(slot, entries, pool->capacity) + + pool->obj_size * nodes; + + /* + * here we allocate percpu-slot & objs together in a single + * allocation to make it more compact, taking advantage of + * warm caches and TLB hits. in default vmalloc is used to + * reduce the pressure of kernel slab system. as we know, + * mimimal size of vmalloc is one page since vmalloc would + * always align the requested size to page size. + * but if vmalloc fails or it is not available (e.g. GFP_ATOMIC) + * allocate percpu slot with kmalloc. + */ + slot = NULL; + + if ((pool->gfp & (GFP_ATOMIC | GFP_KERNEL)) != GFP_ATOMIC) + slot = __vmalloc_node(size, sizeof(void *), pool->gfp, + cpu_to_node(i), __builtin_return_address(0)); + + if (!slot) { + slot = kmalloc_node(size, pool->gfp, cpu_to_node(i)); + if (!slot) + return -ENOMEM; + } + memset(slot, 0, size); + pool->cpu_slots[i] = slot; + + /* initialize the objpool_slot of cpu node i */ + rc = objpool_init_percpu_slot(pool, slot, nodes, context, objinit); + if (rc) + return rc; + } + + return 0; +} + +/* cleanup all percpu slots of the object pool */ +static void objpool_fini_percpu_slots(struct objpool_head *pool) +{ + int i; + + if (!pool->cpu_slots) + return; + + for (i = 0; i < nr_cpu_ids; i++) + kvfree(pool->cpu_slots[i]); + kfree(pool->cpu_slots); +} + +/* initialize object pool and pre-allocate objects */ +int objpool_init(struct objpool_head *pool, int nr_objs, int object_size, + gfp_t gfp, void *context, objpool_init_obj_cb objinit, + objpool_fini_cb release) +{ + int rc, capacity, slot_size; + + /* check input parameters */ + if (nr_objs <= 0 || nr_objs > OBJPOOL_NR_OBJECT_MAX || + object_size <= 0 || object_size > OBJPOOL_OBJECT_SIZE_MAX) + return -EINVAL; + + /* align up to unsigned long size */ + object_size = ALIGN(object_size, sizeof(long)); + + /* calculate capacity of percpu objpool_slot */ + capacity = roundup_pow_of_two(nr_objs); + if (!capacity) + return -EINVAL; + + /* initialize objpool pool */ + memset(pool, 0, sizeof(struct objpool_head)); + pool->nr_possible_cpus = num_possible_cpus(); + pool->obj_size = object_size; + pool->capacity = capacity; + pool->gfp = gfp & ~__GFP_ZERO; + pool->context = context; + pool->release = release; + slot_size = nr_cpu_ids * sizeof(struct objpool_slot *); + pool->cpu_slots = kzalloc(slot_size, pool->gfp); + if (!pool->cpu_slots) + return -ENOMEM; + + /* initialize per-cpu slots */ + rc = objpool_init_percpu_slots(pool, nr_objs, context, objinit); + if (rc) + objpool_fini_percpu_slots(pool); + else + refcount_set(&pool->ref, pool->nr_objs + 1); + + return rc; +} +EXPORT_SYMBOL_GPL(objpool_init); + +/* release whole objpool forcely */ +void objpool_free(struct objpool_head *pool) +{ + if (!pool->cpu_slots) + return; + + /* release percpu slots */ + objpool_fini_percpu_slots(pool); + + /* call user's cleanup callback if provided */ + if (pool->release) + pool->release(pool, pool->context); +} +EXPORT_SYMBOL_GPL(objpool_free); + +/* drop the allocated object, rather reclaim it to objpool */ +int objpool_drop(void *obj, struct objpool_head *pool) +{ + if (!obj || !pool) + return -EINVAL; + + if (refcount_dec_and_test(&pool->ref)) { + objpool_free(pool); + return 0; + } + + return -EAGAIN; +} +EXPORT_SYMBOL_GPL(objpool_drop); + +/* drop unused objects and defref objpool for releasing */ +void objpool_fini(struct objpool_head *pool) +{ + int count = 1; /* extra ref for objpool itself */ + + /* drop all remained objects from objpool */ + while (objpool_pop(pool)) + count++; + + if (refcount_sub_and_test(count, &pool->ref)) + objpool_free(pool); +} +EXPORT_SYMBOL_GPL(objpool_fini); -- cgit v1.3.1