| /openbmc/linux/arch/csky/ |
| H A D | Kconfig | 13 select ARCH_INLINE_READ_LOCK if !PREEMPTION
14 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
15 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
16 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
17 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
18 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
19 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
20 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
21 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
22 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
[all …]
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| /openbmc/linux/Documentation/locking/ |
| H A D | preempt-locking.rst | 35 protect these situations by disabling preemption around them.
37 You can also use put_cpu() and get_cpu(), which will disable preemption.
44 Under preemption, the state of the CPU must be protected. This is arch-
47 section that must occur while preemption is disabled. Think what would happen
50 upon preemption, the FPU registers will be sold to the lowest bidder. Thus,
51 preemption must be disabled around such regions.
54 kernel_fpu_begin and kernel_fpu_end will disable and enable preemption.
72 Data protection under preemption is achieved by disabling preemption for the
84 n-times in a code path, and preemption will not be reenabled until the n-th
86 preemption is not enabled.
[all …]
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| H A D | locktypes.rst | 59 preemption and interrupt disabling primitives. Contrary to other locking
60 mechanisms, disabling preemption or interrupts are pure CPU local
76 Spinning locks implicitly disable preemption and the lock / unlock functions
103 PI has limitations on non-PREEMPT_RT kernels due to preemption and
106 PI clearly cannot preempt preemption-disabled or interrupt-disabled
162 by disabling preemption or interrupts.
164 On non-PREEMPT_RT kernels local_lock operations map to the preemption and
200 local_lock should be used in situations where disabling preemption or
204 local_lock is not suitable to protect against preemption or interrupts on a
217 preemption or interrupts is required, for example, to safely access
[all …]
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| H A D | hwspinlock.rst | 106 Upon a successful return from this function, preemption is disabled so
122 Upon a successful return from this function, preemption and the local
138 Upon a successful return from this function, preemption is disabled,
189 Upon a successful return from this function, preemption is disabled so
206 Upon a successful return from this function, preemption and the local
222 Upon a successful return from this function, preemption is disabled,
279 Upon a successful return from this function, preemption and local
291 Upon a successful return from this function, preemption is reenabled,
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| H A D | seqlock.rst | 47 preemption, preemption must be explicitly disabled before entering the
72 /* Serialized context with disabled preemption */
107 For lock types which do not implicitly disable preemption, preemption
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| /openbmc/linux/kernel/ |
| H A D | Kconfig.preempt | 11 select PREEMPTION
15 prompt "Preemption Model"
19 bool "No Forced Preemption (Server)"
22 This is the traditional Linux preemption model, geared towards
33 bool "Voluntary Kernel Preemption (Desktop)"
38 "explicit preemption points" to the kernel code. These new
39 preemption points have been selected to reduce the maximum
61 otherwise not be about to reach a natural preemption point.
73 select PREEMPTION
92 config PREEMPTION config
[all …]
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| H A D | Kconfig.locks | 104 # - DEBUG_SPINLOCK=n and PREEMPTION=n
142 depends on !PREEMPTION || ARCH_INLINE_SPIN_UNLOCK_IRQ
171 depends on !PREEMPTION || ARCH_INLINE_READ_UNLOCK
179 depends on !PREEMPTION || ARCH_INLINE_READ_UNLOCK_IRQ
208 depends on !PREEMPTION || ARCH_INLINE_WRITE_UNLOCK
216 depends on !PREEMPTION || ARCH_INLINE_WRITE_UNLOCK_IRQ
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| /openbmc/linux/drivers/gpu/drm/msm/adreno/ |
| H A D | a5xx_gpu.h | 58 * In order to do lockless preemption we use a simple state machine to progress
61 * PREEMPT_NONE - no preemption in progress. Next state START.
62 * PREEMPT_START - The trigger is evaulating if preemption is possible. Next
66 * PREEMPT_TRIGGERED: A preemption has been executed on the hardware. Next
68 * PREEMPT_FAULTED: A preemption timed out (never completed). This will trigger
70 * PREEMPT_PENDING: Preemption complete interrupt fired - the callback is
85 * CPU to store the state for preemption. The record itself is much larger
88 * There is a preemption record assigned per ringbuffer. When the CPU triggers a
89 * preemption, it fills out the record with the useful information (wptr, ring
91 * the preemption. When a ring is switched out, the CP will save the ringbuffer
[all …]
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| H A D | a5xx_preempt.c | 9 * Try to transition the preemption state from old to new. Return
22 * Force the preemption state to the specified state. This is used in cases
30 * preemption or in the interrupt handler so barriers are needed in set_preempt_state()
89 DRM_DEV_ERROR(dev->dev, "%s: preemption timed out\n", gpu->name); in a5xx_preempt_timer()
93 /* Try to trigger a preemption switch */
105 * Serialize preemption start to ensure that we always make in a5xx_preempt_trigger()
112 * Try to start preemption by moving from NONE to START. If in a5xx_preempt_trigger()
113 * unsuccessful, a preemption is already in flight in a5xx_preempt_trigger()
127 * Its possible that while a preemption request is in progress in a5xx_preempt_trigger()
151 /* Set the address of the incoming preemption record */ in a5xx_preempt_trigger()
[all …]
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| /openbmc/linux/arch/loongarch/ |
| H A D | Kconfig | 23 select ARCH_INLINE_READ_LOCK if !PREEMPTION
24 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
25 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
26 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
27 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
28 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
29 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
30 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
31 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
32 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
[all …]
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| /openbmc/linux/Documentation/core-api/ |
| H A D | entry.rst | 10 * Preemption counter
167 irq_enter_rcu() updates the preemption count which makes in_hardirq()
172 irq_exit_rcu() handles interrupt time accounting, undoes the preemption
175 In theory, the preemption count could be updated in irqentry_enter(). In
176 practice, deferring this update to irq_enter_rcu() allows the preemption-count
180 preemption count has not yet been updated with the HARDIRQ_OFFSET state.
182 Note that irq_exit_rcu() must remove HARDIRQ_OFFSET from the preemption count
185 also requires that HARDIRQ_OFFSET has been removed from the preemption count.
215 * Preemption counter
223 Note that the update of the preemption counter has to be the first
[all …]
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| H A D | local_ops.rst | 42 making sure that we modify it from within a preemption safe context. It is
70 * Preemption (or interrupts) must be disabled when using local ops in
76 preemption already disabled. I suggest, however, to explicitly
77 disable preemption anyway to make sure it will still work correctly on
104 local atomic operations: it makes sure that preemption is disabled around write
110 If you are already in a preemption-safe context, you can use
161 * preemptible context (it disables preemption) :
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| H A D | this_cpu_ops.rst | 20 necessary to disable preemption or interrupts to ensure that the
44 The following this_cpu() operations with implied preemption protection
46 preemption and interrupts::
110 reserved for a specific processor. Without disabling preemption in the
142 preemption has been disabled. The pointer is then used to
143 access local per cpu data in a critical section. When preemption
230 preemption. If a per cpu variable is not used in an interrupt context
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| /openbmc/linux/include/linux/ |
| H A D | preempt.h | 7 * preempt_count (used for kernel preemption, interrupt count, etc.)
15 * We put the hardirq and softirq counter into the preemption
18 * - bits 0-7 are the preemption count (max preemption depth: 256)
60 * Disable preemption until the scheduler is running -- use an unconditional
160 /* Locks on RT do not disable preemption */
169 * Which need to disable both preemption (CONFIG_PREEMPT_COUNT) and
281 * Even if we don't have any preemption, we need preempt disable/enable
301 * Modules have no business playing preemption tricks.
344 * preempt_notifier - key for installing preemption notifiers
437 * preempt_disable_nested - Disable preemption inside a normally preempt disabled section
[all …]
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| H A D | hwspinlock.h | 180 * Upon a successful return from this function, preemption and local
201 * Upon a successful return from this function, preemption and local
256 * Upon a successful return from this function, preemption is disabled,
279 * Upon a successful return from this function, preemption and local interrupts
302 * Upon a successful return from this function, preemption and local interrupts
370 * Upon a successful return from this function, preemption is disabled
391 * This function will unlock a specific hwspinlock, enable preemption and
408 * This function will unlock a specific hwspinlock, enable preemption and
454 * This function will unlock a specific hwspinlock and enable preemption
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| /openbmc/linux/tools/testing/selftests/kvm/x86_64/ |
| H A D | vmx_preemption_timer_test.c | 3 * VMX-preemption timer test
61 * Now wait for the preemption timer to fire and in l2_guest_code()
85 * Check for Preemption timer support in l1_guest_code()
128 * Ensure the exit from L2 is due to preemption timer expiry in l1_guest_code()
204 * From L1's perspective verify Preemption timer hasn't in main()
206 * From L2's perspective verify Preemption timer hasn't in main()
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| /openbmc/linux/arch/ia64/kernel/ |
| H A D | smp.c | 141 * Called with preemption disabled.
151 * Called with preemption disabled.
165 * Called with preemption disabled.
178 * Called with preemption disabled.
191 * Called with preemption disabled.
220 * Called with preemption disabled.
230 * Called with preemption disabled.
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| /openbmc/linux/arch/arm64/include/asm/ |
| H A D | simd.h | 31 * fpsimd_context_busy is only set while preemption is disabled, in may_use_simd()
32 * and is clear whenever preemption is enabled. Since in may_use_simd()
33 * this_cpu_read() is atomic w.r.t. preemption, fpsimd_context_busy in may_use_simd()
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| H A D | percpu.h | 26 * Non-VHE hyp code runs with preemption disabled. No need to hazard in __hyp_my_cpu_offset()
140 * re-enabling preemption for preemptible kernels, but doing that in a way
144 * Not to mention it'll break the actual preemption model for missing a
145 * preemption point when TIF_NEED_RESCHED gets set while preemption is
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| /openbmc/linux/Documentation/RCU/ |
| H A D | NMI-RCU.rst | 45 The do_nmi() function processes each NMI. It first disables preemption
50 preemption is restored.
95 CPUs complete any preemption-disabled segments of code that they were
97 Since NMI handlers disable preemption, synchronize_rcu() is guaranteed
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| /openbmc/linux/drivers/gpu/drm/i915/ |
| H A D | intel_pcode.c | 147 * @timeout_base_ms: timeout for polling with preemption enabled
152 * applying @reply_mask. Polling is first attempted with preemption enabled
154 * preemption disabled.
188 * the poll with preemption disabled to maximize the number of in skl_pcode_request()
195 "PCODE timeout, retrying with preemption disabled\n"); in skl_pcode_request()
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| /openbmc/linux/kernel/rcu/ |
| H A D | Kconfig | 21 default y if PREEMPTION
34 default y if !PREEMPTION && !SMP
84 that uses only voluntary context switch (not preemption!),
100 that uses only context switch (including preemption) and
252 the "x" is "p" for RCU-preempt (PREEMPTION kernels) and "s" for
253 RCU-sched (!PREEMPTION kernels). Nothing prevents this kthread
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| /openbmc/linux/arch/x86/include/asm/fpu/ |
| H A D | api.h | 19 * disables preemption so be careful if you intend to use it for long periods
58 * local_bh_disable() protects against both preemption and soft interrupts
63 * preemptible. Disabling preemption is the right choice here as bottom
67 * Disabling preemption also serializes against kernel_fpu_begin().
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| /openbmc/linux/fs/ |
| H A D | stack.c | 18 * preemption (see include/linux/fs.h): we need nothing extra for in fsstack_copy_inode_size()
26 * i_blocks in sync despite SMP or PREEMPTION - though stat's in fsstack_copy_inode_size()
48 * i_blocks in sync despite SMP or PREEMPTION: use i_lock for that case in fsstack_copy_inode_size()
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| /openbmc/linux/arch/arm64/ |
| H A D | Kconfig | 54 select ARCH_INLINE_READ_LOCK if !PREEMPTION
55 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
56 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION
57 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION
58 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION
59 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION
60 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION
61 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION
62 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION
63 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION
[all …]
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