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 ... --- drivers/md/dm-exception-store.c | 291 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 291 insertions(+) create mode 100644 drivers/md/dm-exception-store.c (limited to 'drivers/md/dm-exception-store.c') diff --git a/drivers/md/dm-exception-store.c b/drivers/md/dm-exception-store.c new file mode 100644 index 000000000..58cbc5e54 --- /dev/null +++ b/drivers/md/dm-exception-store.c @@ -0,0 +1,291 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2001-2002 Sistina Software (UK) Limited. + * Copyright (C) 2006-2008 Red Hat GmbH + * + * This file is released under the GPL. + */ + +#include "dm-exception-store.h" + +#include +#include +#include +#include +#include +#include + +#define DM_MSG_PREFIX "snapshot exception stores" + +static LIST_HEAD(_exception_store_types); +static DEFINE_SPINLOCK(_lock); + +static struct dm_exception_store_type *__find_exception_store_type(const char *name) +{ + struct dm_exception_store_type *type; + + list_for_each_entry(type, &_exception_store_types, list) + if (!strcmp(name, type->name)) + return type; + + return NULL; +} + +static struct dm_exception_store_type *_get_exception_store_type(const char *name) +{ + struct dm_exception_store_type *type; + + spin_lock(&_lock); + + type = __find_exception_store_type(name); + + if (type && !try_module_get(type->module)) + type = NULL; + + spin_unlock(&_lock); + + return type; +} + +/* + * get_type + * @type_name + * + * Attempt to retrieve the dm_exception_store_type by name. If not already + * available, attempt to load the appropriate module. + * + * Exstore modules are named "dm-exstore-" followed by the 'type_name'. + * Modules may contain multiple types. + * This function will first try the module "dm-exstore-", + * then truncate 'type_name' on the last '-' and try again. + * + * For example, if type_name was "clustered-shared", it would search + * 'dm-exstore-clustered-shared' then 'dm-exstore-clustered'. + * + * 'dm-exception-store-' is too long of a name in my + * opinion, which is why I've chosen to have the files + * containing exception store implementations be 'dm-exstore-'. + * If you want your module to be autoloaded, you will follow this + * naming convention. + * + * Returns: dm_exception_store_type* on success, NULL on failure + */ +static struct dm_exception_store_type *get_type(const char *type_name) +{ + char *p, *type_name_dup; + struct dm_exception_store_type *type; + + type = _get_exception_store_type(type_name); + if (type) + return type; + + type_name_dup = kstrdup(type_name, GFP_KERNEL); + if (!type_name_dup) { + DMERR("No memory left to attempt load for \"%s\"", type_name); + return NULL; + } + + while (request_module("dm-exstore-%s", type_name_dup) || + !(type = _get_exception_store_type(type_name))) { + p = strrchr(type_name_dup, '-'); + if (!p) + break; + p[0] = '\0'; + } + + if (!type) + DMWARN("Module for exstore type \"%s\" not found.", type_name); + + kfree(type_name_dup); + + return type; +} + +static void put_type(struct dm_exception_store_type *type) +{ + spin_lock(&_lock); + module_put(type->module); + spin_unlock(&_lock); +} + +int dm_exception_store_type_register(struct dm_exception_store_type *type) +{ + int r = 0; + + spin_lock(&_lock); + if (!__find_exception_store_type(type->name)) + list_add(&type->list, &_exception_store_types); + else + r = -EBUSY; + spin_unlock(&_lock); + + return r; +} +EXPORT_SYMBOL(dm_exception_store_type_register); + +int dm_exception_store_type_unregister(struct dm_exception_store_type *type) +{ + spin_lock(&_lock); + + if (!__find_exception_store_type(type->name)) { + spin_unlock(&_lock); + return -EINVAL; + } + + list_del(&type->list); + + spin_unlock(&_lock); + + return 0; +} +EXPORT_SYMBOL(dm_exception_store_type_unregister); + +static int set_chunk_size(struct dm_exception_store *store, + const char *chunk_size_arg, char **error) +{ + unsigned int chunk_size; + + if (kstrtouint(chunk_size_arg, 10, &chunk_size)) { + *error = "Invalid chunk size"; + return -EINVAL; + } + + if (!chunk_size) { + store->chunk_size = store->chunk_mask = store->chunk_shift = 0; + return 0; + } + + return dm_exception_store_set_chunk_size(store, chunk_size, error); +} + +int dm_exception_store_set_chunk_size(struct dm_exception_store *store, + unsigned int chunk_size, + char **error) +{ + /* Check chunk_size is a power of 2 */ + if (!is_power_of_2(chunk_size)) { + *error = "Chunk size is not a power of 2"; + return -EINVAL; + } + + /* Validate the chunk size against the device block size */ + if (chunk_size % + (bdev_logical_block_size(dm_snap_cow(store->snap)->bdev) >> 9) || + chunk_size % + (bdev_logical_block_size(dm_snap_origin(store->snap)->bdev) >> 9)) { + *error = "Chunk size is not a multiple of device blocksize"; + return -EINVAL; + } + + if (chunk_size > INT_MAX >> SECTOR_SHIFT) { + *error = "Chunk size is too high"; + return -EINVAL; + } + + store->chunk_size = chunk_size; + store->chunk_mask = chunk_size - 1; + store->chunk_shift = __ffs(chunk_size); + + return 0; +} + +int dm_exception_store_create(struct dm_target *ti, int argc, char **argv, + struct dm_snapshot *snap, + unsigned int *args_used, + struct dm_exception_store **store) +{ + int r = 0; + struct dm_exception_store_type *type = NULL; + struct dm_exception_store *tmp_store; + char persistent; + + if (argc < 2) { + ti->error = "Insufficient exception store arguments"; + return -EINVAL; + } + + tmp_store = kzalloc_obj(*tmp_store); + if (!tmp_store) { + ti->error = "Exception store allocation failed"; + return -ENOMEM; + } + + persistent = toupper(*argv[0]); + if (persistent == 'P') + type = get_type("P"); + else if (persistent == 'N') + type = get_type("N"); + else { + ti->error = "Exception store type is not P or N"; + r = -EINVAL; + goto bad_type; + } + + if (!type) { + ti->error = "Exception store type not recognised"; + r = -EINVAL; + goto bad_type; + } + + tmp_store->type = type; + tmp_store->snap = snap; + + r = set_chunk_size(tmp_store, argv[1], &ti->error); + if (r) + goto bad; + + r = type->ctr(tmp_store, (strlen(argv[0]) > 1 ? &argv[0][1] : NULL)); + if (r) { + ti->error = "Exception store type constructor failed"; + goto bad; + } + + *args_used = 2; + *store = tmp_store; + return 0; + +bad: + put_type(type); +bad_type: + kfree(tmp_store); + return r; +} +EXPORT_SYMBOL(dm_exception_store_create); + +void dm_exception_store_destroy(struct dm_exception_store *store) +{ + store->type->dtr(store); + put_type(store->type); + kfree(store); +} +EXPORT_SYMBOL(dm_exception_store_destroy); + +int dm_exception_store_init(void) +{ + int r; + + r = dm_transient_snapshot_init(); + if (r) { + DMERR("Unable to register transient exception store type."); + goto transient_fail; + } + + r = dm_persistent_snapshot_init(); + if (r) { + DMERR("Unable to register persistent exception store type"); + goto persistent_fail; + } + + return 0; + +persistent_fail: + dm_transient_snapshot_exit(); +transient_fail: + return r; +} + +void dm_exception_store_exit(void) +{ + dm_persistent_snapshot_exit(); + dm_transient_snapshot_exit(); +} -- cgit v1.3.1