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/linux/Documentation/devicetree/bindings/i2c/
H A Di2c-arb-gpio-challenge.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/i2c/i2c-arb-gpio-challenge.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: GPIO-based I2C Arbitration Using a Challenge & Response Mechanism
10 - Doug Anderson <dianders@chromium.org>
11 - Peter Rosin <peda@axentia.se>
18 standard I2C multi-master rules. Using GPIOs is generally useful in the case
30 others can see. These are all active low with pull-ups enabled. We'll
32 * OUR_CLAIM: output from us signaling to other hosts that we want the bus
[all …]
/linux/fs/btrfs/
H A Dspace-info.c1 // SPDX-License-Identifier: GPL-2.0
7 #include "space-info.h"
10 #include "free-space-cache.h"
11 #include "ordered-data.h"
13 #include "block-group.h"
16 #include "extent-tree.h"
31 * reservations we care about total_bytes - SUM(space_info->bytes_) when
37 * code on the rules for each type, but generally block_rsv->reserved is how
38 * much space is accounted for in space_info->bytes_may_use.
52 * ->reserve
[all …]
H A Dblock-group.c1 // SPDX-License-Identifier: GPL-2.0
7 #include "block-group.h"
8 #include "space-info.h"
9 #include "disk-io.h"
10 #include "free-space-cache.h"
11 #include "free-space-tree.h"
14 #include "ref-verify.h"
16 #include "tree-log.h"
17 #include "delalloc-space.h"
23 #include "extent-tree.h"
[all …]
/linux/arch/arm/mach-omap1/
H A Dsleep.S2 * linux/arch/arm/mach-omap1/sleep.S
4 * Low-level OMAP7XX/1510/1610 sleep/wakeUp support
14 * This program is free software; you can redistribute it and/or modify it
16 * Free Software Foundation; either version 2 of the License, or (at your
31 * with this program; if not, write to the Free Software Foundation, Inc.,
69 stmfd sp!, {r0 - r12, lr}
86 @ prepare to put SDRAM into self-refresh manually
118 * Let's wait for the next wake up event to wake us up. r0 can't be
122 mcr p15, 0, r2, c7, c0, 4 @ wait for interrupt
133 ldmfd sp!, {r0 - r12, pc}
[all …]
/linux/tools/testing/selftests/cgroup/
H A Dtest_freezer.c1 /* SPDX-License-Identifier: GPL-2.0 */
12 #include <sys/wait.h>
32 return -1; in cg_check_frozen()
40 return -1; in cg_check_frozen()
56 * Attach a task to the given cgroup and wait for a cgroup frozen event.
62 int fd, ret = -1; in cg_enter_and_wait_for_frozen()
89 * Freeze the given cgroup and wait for the inotify signal.
95 int fd, ret = -1; in cg_freeze_wait()
119 * re-parented.
169 free(cgroup); in test_cgfreezer_simple()
[all …]
/linux/drivers/rtc/
H A Drtc-tegra.c1 // SPDX-License-Identifier: GPL-2.0+
5 * Copyright (c) 2010-2019, NVIDIA Corporation.
59 * eight 32 kHz clocks (~250 us). Outside of these updates the CPU is free to
60 * write. CPU is always free to read.
64 return readl(info->base + TEGRA_RTC_REG_BUSY) & 1; in tegra_rtc_check_busy()
68 * Wait for hardware to be ready for writing. This function tries to maximize
74 * AHB side) occurs every eight 32 kHz clocks (~250 us). The behavior of this
75 * function allows us to make some assumptions without introducing a race,
76 * because 250 us is plenty of time to read/write a value.
81 int retries = 500; /* ~490 us is the worst case, ~250 us is best */ in tegra_rtc_wait_while_busy()
[all …]
/linux/drivers/scsi/aic7xxx/
H A Daic79xx.seq4 * Copyright (c) 1994-2001, 2004 Justin T. Gibbs.
5 * Copyright (c) 2000-2002 Adaptec Inc.
19 * 3. Neither the names of the above-listed copyright holders nor the names
24 * GNU General Public License ("GPL") version 2 as published by the Free
51 if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
58 if ((ahd->bugs & AHD_INTCOLLISION_BUG) != 0) {
73 * If the kernel has caught up with us, thaw the queue.
100 cmp SCB_NEXT_COMPLETE[1], SCB_LIST_NULL jne . - 1;
124 if ((ahd->bugs & AHD_FAINT_LED_BUG) != 0) {
128 * and re-selections. Make the LED status
[all …]
H A Daic7xxx.seq4 * Copyright (c) 1994-2001 Justin T. Gibbs.
5 * Copyright (c) 2000-2001 Adaptec Inc.
19 * 3. Neither the names of the above-listed copyright holders nor the names
24 * GNU General Public License ("GPL") version 2 as published by the Free
60 * use byte 27 of the SCB as a pseudo-next pointer and to thread a list
61 * of SCBs that are awaiting selection. Since 0-0xfe are valid SCB indexes,
63 * this list every time a request sense occurs or after completing a non-tagged
78 if ((ahc->features & AHC_ULTRA2) != 0) {
82 if ((ahc->features & AHC_TWIN) != 0) {
88 if ((ahc->features & AHC_TWIN) != 0) {
[all …]
/linux/kernel/locking/
H A Dqspinlock_paravirt.h1 /* SPDX-License-Identifier: GPL-2.0 */
16 * pv_wait(u8 *ptr, u8 val) -- suspends the vcpu if *ptr == val
17 * pv_kick(cpu) -- wakes a suspended vcpu
31 * mitigates the slight slowdown for non-overcommitted guest with this
32 * aggressive wait-early mechanism.
63 * The pending bit is set by the queue head vCPU of the MCS wait queue in
67 * enter the MCS wait queue. So lock starvation shouldn't happen as long
72 * mode spinning on the lock unless the MCS wait queue is empty. In this
85 * present in the MCS wait queue but the pending bit isn't set. in pv_hybrid_queued_unfair_trylock()
88 int val = atomic_read(&lock->val); in pv_hybrid_queued_unfair_trylock()
[all …]
/linux/drivers/net/ethernet/marvell/
H A Dmvmdio.c13 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
34 #include <linux/wait.h>
65 * - Kirkwood 88F6281 (Globalscale Dreamplug): 45us to 95us (Interrupt)
66 * - Armada 370 (Globalscale Mirabox): 41us to 43us (Polled)
68 #define MVMDIO_SMI_TIMEOUT 1000 /* 1000us = 1ms */
76 * but also reflects SMI completion), use that to wait for
92 /* Wait for the SMI unit to be ready for another operation
97 struct orion_mdio_dev *dev = bus->priv; in orion_mdio_wait_ready()
101 if (dev->err_interrupt <= 0) { in orion_mdio_wait_ready()
102 if (!read_poll_timeout_atomic(ops->is_done, done, done, 2, in orion_mdio_wait_ready()
[all …]
/linux/fs/xfs/
H A Dxfs_icache.c1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
97 ip = alloc_inode_sb(mp->m_super, xfs_inode_cache, GFP_KERNEL | __GFP_NOFAIL); in xfs_inode_alloc()
99 if (inode_init_always(mp->m_super, VFS_I(ip))) { in xfs_inode_alloc()
105 VFS_I(ip)->i_mode = 0; in xfs_inode_alloc()
106 mapping_set_folio_min_order(VFS_I(ip)->i_mapping, in xfs_inode_alloc()
107 M_IGEO(mp)->min_folio_order); in xfs_inode_alloc()
110 ASSERT(atomic_read(&ip->i_pincount) == 0); in xfs_inode_alloc()
111 ASSERT(ip->i_ino == 0); in xfs_inode_alloc()
114 ip->i_ino = ino; in xfs_inode_alloc()
[all …]
H A Dxfs_trans_ail.c1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
36 __must_hold(&ailp->ail_lock) in xfs_ail_check()
46 if (list_empty(&ailp->ail_head)) in xfs_ail_check()
52 in_ail = test_bit(XFS_LI_IN_AIL, &lip->li_flags); in xfs_ail_check()
53 prev_lip = list_entry(lip->li_ail.prev, struct xfs_log_item, li_ail); in xfs_ail_check()
54 if (&prev_lip->li_ail != &ailp->ail_head) in xfs_ail_check()
55 prev_lsn = prev_lip->li_lsn; in xfs_ail_check()
56 next_lip = list_entry(lip->li_ail.next, struct xfs_log_item, li_ail); in xfs_ail_check()
57 if (&next_lip->li_ail != &ailp->ail_head) in xfs_ail_check()
[all …]
/linux/kernel/
H A Dexit.c1 // SPDX-License-Identifier: GPL-2.0-only
43 #include <linux/posix-timers.h>
75 #include <uapi/linux/wait.h>
85 * overflowing 32-bit refcounts or the ldsem writer count.
139 nr_threads--; in __unhash_process()
141 detach_pid(post->pids, p, PIDTYPE_PID); in __unhash_process()
142 wake_up_all(&pid->wait_pidfd); in __unhash_process()
145 detach_pid(post->pids, p, PIDTYPE_TGID); in __unhash_process()
146 detach_pid(post->pids, p, PIDTYPE_PGID); in __unhash_process()
147 detach_pid(post->pids, p, PIDTYPE_SID); in __unhash_process()
[all …]
/linux/arch/arm/boot/dts/allwinner/
H A Dsun7i-a20-hummingbird.dts6 * This file is dual-licensed: you can use it either under the terms
11 * a) This file is free software; you can redistribute it and/or
13 * published by the Free Software Foundation; either version 2 of the
23 * b) Permission is hereby granted, free of charge, to any person
45 /dts-v1/;
46 #include "sun7i-a20.dtsi"
47 #include "sunxi-common-regulators.dtsi"
49 #include <dt-bindings/gpio/gpio.h>
50 #include <dt-bindings/interrupt-controller/irq.h>
54 compatible = "merrii,a20-hummingbird", "allwinner,sun7i-a20";
[all …]
/linux/drivers/gpu/drm/amd/amdgpu/
H A Damdgpu_cs.c5 * Permission is hereby granted, free of charge, to any person obtaining a
31 #include <linux/dma-buf.h>
50 struct amdgpu_fpriv *fpriv = filp->driver_priv; in amdgpu_cs_parser_init()
52 if (cs->in.num_chunks == 0) in amdgpu_cs_parser_init()
53 return -EINVAL; in amdgpu_cs_parser_init()
56 p->adev = adev; in amdgpu_cs_parser_init()
57 p->filp = filp; in amdgpu_cs_parser_init()
59 p->ctx = amdgpu_ctx_get(fpriv, cs->in.ctx_id); in amdgpu_cs_parser_init()
60 if (!p->ctx) in amdgpu_cs_parser_init()
61 return -EINVAL; in amdgpu_cs_parser_init()
[all …]
/linux/fs/
H A Deventpoll.c1 // SPDX-License-Identifier: GPL-2.0-or-later
25 #include <linux/wait.h>
48 * 2) ep->mtx (mutex)
49 * 3) ep->lock (spinlock)
52 * We need a spinlock (ep->lock) because we manipulate objects
58 * we need a lock that will allow us to sleep. This lock is a
59 * mutex (ep->mtx). It is acquired during the event transfer loop,
68 * It is necessary to acquire multiple "ep->mtx"es at once in the
71 * epoll_ctl(e1, EPOLL_CTL_ADD, e2), e1->mtx will always be acquired
72 * before e2->mtx). Since we disallow cycles of epoll file
[all …]
/linux/drivers/md/bcache/
H A Djournal.h1 /* SPDX-License-Identifier: GPL-2.0 */
8 * The journal is treated as a circular buffer of buckets - a journal entry
16 * superblock - all the things that are frequently updated. This is for future
22 * Currently, we don't journal BTREE_REPLACE operations - this will hopefully be
23 * fixed eventually. This isn't a bug - BTREE_REPLACE is used for insertions
32 * journal entry still open - i.e. that has keys that haven't been flushed to
38 * zero, we pop it off - thus, the size of the fifo tells us the number of open
48 * might contain keys for many journal entries - we handle this by making sure
54 * As mentioned previously, our fifo of refcounts tells us the number of open
56 * last_seq - the oldest journal entry we still need. We write last_seq in each
[all …]
/linux/io_uring/
H A Dpoll.c1 // SPDX-License-Identifier: GPL-2.0
49 * We usually have 1-2 refs taken, 128 is more than enough and we want to
56 static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
61 unsigned long priv = (unsigned long)wqe->private; in wqe_to_req()
68 unsigned long priv = (unsigned long)wqe->private; in wqe_is_double()
82 v = atomic_fetch_or(IO_POLL_RETRY_FLAG, &req->poll_refs); in io_poll_get_ownership_slowpath()
85 return !(atomic_fetch_inc(&req->poll_refs) & IO_POLL_REF_MASK); in io_poll_get_ownership_slowpath()
89 * If refs part of ->poll_ref
392 io_poll_wake(struct wait_queue_entry * wait,unsigned mode,int sync,void * key) io_poll_wake() argument
[all...]
H A Dio-wq.c1 // SPDX-License-Identifier: GPL-2.0
22 #include "io-wq.h"
32 IO_WORKER_F_FREE = 2, /* worker on free list */
89 * The list of free workers. Protected by #workers_lock
128 struct wait_queue_entry wait; member
160 return __io_get_work_hash(atomic_read(&work->flags)); in io_get_work_hash()
165 return refcount_inc_not_zero(&worker->ref); in io_worker_get()
170 if (refcount_dec_and_test(&worker->ref)) in io_worker_release()
171 complete(&worker->ref_done); in io_worker_release()
176 return &wq->acct[bound ? IO_WQ_ACCT_BOUND : IO_WQ_ACCT_UNBOUND]; in io_get_acct()
[all …]
/linux/drivers/char/
H A Dnwbutton.c1 // SPDX-License-Identifier: GPL-2.0-only
3 * NetWinder Button Driver-
22 #include <asm/mach-types.h>
48 * do so and return -ENOMEM. If an attempt is made to register a null pointer,
49 * it will fail to do so and return -EINVAL.
52 * free entry.
61 return -ENOMEM; in button_add_callback()
64 return -EINVAL; in button_add_callback()
76 * with -EINVAL. If there is more than one entry with the same address,
78 * last one to be registered first (FILO- First In Last Out).
[all …]
/linux/drivers/input/serio/
H A Duserio.c6 * This program is free software; you can redistribute it and/or modify it
8 * the Free Software Foundation; either version 2 of the License, or (at
51 * userio_device_write - Write data from serio to a userio device in userspace
57 struct userio_device *userio = id->port_data; in userio_device_write()
59 scoped_guard(spinlock_irqsave, &userio->buf_lock) { in userio_device_write()
60 userio->buf[userio->head] = val; in userio_device_write()
61 userio->head = (userio->head + 1) % USERIO_BUFSIZE; in userio_device_write()
63 if (userio->head == userio->tail) in userio_device_write()
68 wake_up_interruptible(&userio->waitq); in userio_device_write()
78 return -ENOMEM; in userio_char_open()
[all …]
/linux/arch/mips/cavium-octeon/executive/
H A Dcvmx-helper-xaui.c7 * Copyright (C) 2003-2018 Cavium, Inc.
9 * This file is free software; you can redistribute it and/or modify
11 * published by the Free Software Foundation.
14 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
20 * along with this file; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
36 #include <asm/octeon/cvmx-config.h>
38 #include <asm/octeon/cvmx-helper.h>
40 #include <asm/octeon/cvmx-pko-defs.h>
41 #include <asm/octeon/cvmx-gmxx-defs.h>
[all …]
/linux/drivers/scsi/aacraid/
H A Dcommsup.c1 // SPDX-License-Identifier: GPL-2.0-or-later
9 * Copyright (c) 2000-2010 Adaptec, Inc.
10 * 2010-2015 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
11 * 2016-2017 Microsemi Corp. (aacraid@microsemi.com)
42 * fib_map_alloc - allocate the fib objects
51 dev->max_cmd_size = AAC_MAX_NATIVE_SIZE; in fib_map_alloc()
55 &dev->pdev->dev, dev->max_cmd_size, dev->scsi_host_ptr->can_queue, in fib_map_alloc()
56 AAC_NUM_MGT_FIB, &dev->hw_fib_pa)); in fib_map_alloc()
57 dev->hw_fib_va = dma_alloc_coherent(&dev->pdev->dev, in fib_map_alloc()
58 (dev->max_cmd_size + sizeof(struct aac_fib_xporthdr)) in fib_map_alloc()
[all …]
/linux/arch/arm/boot/dts/samsung/
H A Dexynos5250-snow-common.dtsi1 // SPDX-License-Identifier: GPL-2.0
8 #include <dt-bindings/gpio/gpio.h>
9 #include <dt-bindings/clock/maxim,max77686.h>
10 #include <dt-bindings/interrupt-controller/irq.h>
11 #include <dt-bindings/input/input.h>
12 #include <dt-bindings/sound/samsung-i2s.h>
30 stdout-path = "serial3:115200n8";
33 gpio-keys {
34 compatible = "gpio-keys";
35 pinctrl-names = "default";
[all …]
/linux/fs/jbd2/
H A Dtransaction.c1 // SPDX-License-Identifier: GPL-2.0+
7 * Copyright 1998 Red Hat corp --- All Rights Reserved
26 #include <linux/backing-dev.h>
47 return -ENOMEM; in jbd2_journal_init_transaction_cache()
83 transaction->t_journal = journal; in jbd2_get_transaction()
84 transaction->t_state = T_RUNNING; in jbd2_get_transaction()
85 transaction->t_start_time = ktime_get(); in jbd2_get_transaction()
86 transaction->t_tid = journal->j_transaction_sequence++; in jbd2_get_transaction()
87 transaction->t_expires = jiffies + journal->j_commit_interval; in jbd2_get_transaction()
88 atomic_set(&transaction->t_updates, 0); in jbd2_get_transaction()
[all …]

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