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614 lines
20 KiB
614 lines
20 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Fence mechanism for dma-buf to allow for asynchronous dma access |
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* |
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* Copyright (C) 2012 Canonical Ltd |
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* Copyright (C) 2012 Texas Instruments |
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* |
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* Authors: |
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* Rob Clark <[email protected]> |
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* Maarten Lankhorst <[email protected]> |
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*/ |
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#ifndef __LINUX_DMA_FENCE_H |
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#define __LINUX_DMA_FENCE_H |
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|
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#include <linux/err.h> |
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#include <linux/wait.h> |
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#include <linux/list.h> |
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#include <linux/bitops.h> |
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#include <linux/kref.h> |
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#include <linux/sched.h> |
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#include <linux/printk.h> |
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#include <linux/rcupdate.h> |
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struct dma_fence; |
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struct dma_fence_ops; |
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struct dma_fence_cb; |
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|
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/** |
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* struct dma_fence - software synchronization primitive |
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* @refcount: refcount for this fence |
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* @ops: dma_fence_ops associated with this fence |
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* @rcu: used for releasing fence with kfree_rcu |
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* @cb_list: list of all callbacks to call |
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* @lock: spin_lock_irqsave used for locking |
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* @context: execution context this fence belongs to, returned by |
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* dma_fence_context_alloc() |
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* @seqno: the sequence number of this fence inside the execution context, |
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* can be compared to decide which fence would be signaled later. |
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* @flags: A mask of DMA_FENCE_FLAG_* defined below |
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* @timestamp: Timestamp when the fence was signaled. |
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* @error: Optional, only valid if < 0, must be set before calling |
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* dma_fence_signal, indicates that the fence has completed with an error. |
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* |
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* the flags member must be manipulated and read using the appropriate |
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* atomic ops (bit_*), so taking the spinlock will not be needed most |
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* of the time. |
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* |
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* DMA_FENCE_FLAG_SIGNALED_BIT - fence is already signaled |
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* DMA_FENCE_FLAG_TIMESTAMP_BIT - timestamp recorded for fence signaling |
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* DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT - enable_signaling might have been called |
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* DMA_FENCE_FLAG_USER_BITS - start of the unused bits, can be used by the |
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* implementer of the fence for its own purposes. Can be used in different |
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* ways by different fence implementers, so do not rely on this. |
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* |
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* Since atomic bitops are used, this is not guaranteed to be the case. |
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* Particularly, if the bit was set, but dma_fence_signal was called right |
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* before this bit was set, it would have been able to set the |
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* DMA_FENCE_FLAG_SIGNALED_BIT, before enable_signaling was called. |
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* Adding a check for DMA_FENCE_FLAG_SIGNALED_BIT after setting |
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* DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT closes this race, and makes sure that |
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* after dma_fence_signal was called, any enable_signaling call will have either |
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* been completed, or never called at all. |
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*/ |
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struct dma_fence { |
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spinlock_t *lock; |
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const struct dma_fence_ops *ops; |
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/* |
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* We clear the callback list on kref_put so that by the time we |
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* release the fence it is unused. No one should be adding to the |
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* cb_list that they don't themselves hold a reference for. |
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* |
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* The lifetime of the timestamp is similarly tied to both the |
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* rcu freelist and the cb_list. The timestamp is only set upon |
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* signaling while simultaneously notifying the cb_list. Ergo, we |
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* only use either the cb_list of timestamp. Upon destruction, |
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* neither are accessible, and so we can use the rcu. This means |
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* that the cb_list is *only* valid until the signal bit is set, |
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* and to read either you *must* hold a reference to the fence, |
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* and not just the rcu_read_lock. |
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* |
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* Listed in chronological order. |
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*/ |
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union { |
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struct list_head cb_list; |
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/* @cb_list replaced by @timestamp on dma_fence_signal() */ |
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ktime_t timestamp; |
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/* @timestamp replaced by @rcu on dma_fence_release() */ |
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struct rcu_head rcu; |
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}; |
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u64 context; |
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u64 seqno; |
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unsigned long flags; |
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struct kref refcount; |
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int error; |
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}; |
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enum dma_fence_flag_bits { |
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DMA_FENCE_FLAG_SIGNALED_BIT, |
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DMA_FENCE_FLAG_TIMESTAMP_BIT, |
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DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, |
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DMA_FENCE_FLAG_USER_BITS, /* must always be last member */ |
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}; |
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typedef void (*dma_fence_func_t)(struct dma_fence *fence, |
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struct dma_fence_cb *cb); |
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/** |
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* struct dma_fence_cb - callback for dma_fence_add_callback() |
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* @node: used by dma_fence_add_callback() to append this struct to fence::cb_list |
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* @func: dma_fence_func_t to call |
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* |
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* This struct will be initialized by dma_fence_add_callback(), additional |
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* data can be passed along by embedding dma_fence_cb in another struct. |
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*/ |
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struct dma_fence_cb { |
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struct list_head node; |
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dma_fence_func_t func; |
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}; |
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/** |
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* struct dma_fence_ops - operations implemented for fence |
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* |
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*/ |
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struct dma_fence_ops { |
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/** |
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* @use_64bit_seqno: |
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* |
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* True if this dma_fence implementation uses 64bit seqno, false |
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* otherwise. |
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*/ |
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bool use_64bit_seqno; |
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/** |
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* @get_driver_name: |
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* |
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* Returns the driver name. This is a callback to allow drivers to |
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* compute the name at runtime, without having it to store permanently |
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* for each fence, or build a cache of some sort. |
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* |
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* This callback is mandatory. |
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*/ |
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const char * (*get_driver_name)(struct dma_fence *fence); |
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/** |
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* @get_timeline_name: |
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* |
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* Return the name of the context this fence belongs to. This is a |
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* callback to allow drivers to compute the name at runtime, without |
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* having it to store permanently for each fence, or build a cache of |
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* some sort. |
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* |
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* This callback is mandatory. |
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*/ |
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const char * (*get_timeline_name)(struct dma_fence *fence); |
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/** |
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* @enable_signaling: |
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* |
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* Enable software signaling of fence. |
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* |
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* For fence implementations that have the capability for hw->hw |
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* signaling, they can implement this op to enable the necessary |
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* interrupts, or insert commands into cmdstream, etc, to avoid these |
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* costly operations for the common case where only hw->hw |
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* synchronization is required. This is called in the first |
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* dma_fence_wait() or dma_fence_add_callback() path to let the fence |
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* implementation know that there is another driver waiting on the |
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* signal (ie. hw->sw case). |
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* |
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* This function can be called from atomic context, but not |
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* from irq context, so normal spinlocks can be used. |
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* |
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* A return value of false indicates the fence already passed, |
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* or some failure occurred that made it impossible to enable |
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* signaling. True indicates successful enabling. |
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* |
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* &dma_fence.error may be set in enable_signaling, but only when false |
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* is returned. |
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* |
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* Since many implementations can call dma_fence_signal() even when before |
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* @enable_signaling has been called there's a race window, where the |
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* dma_fence_signal() might result in the final fence reference being |
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* released and its memory freed. To avoid this, implementations of this |
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* callback should grab their own reference using dma_fence_get(), to be |
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* released when the fence is signalled (through e.g. the interrupt |
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* handler). |
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* |
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* This callback is optional. If this callback is not present, then the |
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* driver must always have signaling enabled. |
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*/ |
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bool (*enable_signaling)(struct dma_fence *fence); |
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/** |
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* @signaled: |
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* |
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* Peek whether the fence is signaled, as a fastpath optimization for |
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* e.g. dma_fence_wait() or dma_fence_add_callback(). Note that this |
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* callback does not need to make any guarantees beyond that a fence |
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* once indicates as signalled must always return true from this |
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* callback. This callback may return false even if the fence has |
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* completed already, in this case information hasn't propogated throug |
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* the system yet. See also dma_fence_is_signaled(). |
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* |
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* May set &dma_fence.error if returning true. |
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* |
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* This callback is optional. |
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*/ |
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bool (*signaled)(struct dma_fence *fence); |
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/** |
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* @wait: |
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* |
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* Custom wait implementation, defaults to dma_fence_default_wait() if |
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* not set. |
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* |
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* The dma_fence_default_wait implementation should work for any fence, as long |
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* as @enable_signaling works correctly. This hook allows drivers to |
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* have an optimized version for the case where a process context is |
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* already available, e.g. if @enable_signaling for the general case |
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* needs to set up a worker thread. |
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* |
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* Must return -ERESTARTSYS if the wait is intr = true and the wait was |
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* interrupted, and remaining jiffies if fence has signaled, or 0 if wait |
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* timed out. Can also return other error values on custom implementations, |
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* which should be treated as if the fence is signaled. For example a hardware |
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* lockup could be reported like that. |
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* |
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* This callback is optional. |
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*/ |
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signed long (*wait)(struct dma_fence *fence, |
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bool intr, signed long timeout); |
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/** |
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* @release: |
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* |
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* Called on destruction of fence to release additional resources. |
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* Can be called from irq context. This callback is optional. If it is |
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* NULL, then dma_fence_free() is instead called as the default |
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* implementation. |
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*/ |
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void (*release)(struct dma_fence *fence); |
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/** |
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* @fence_value_str: |
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* |
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* Callback to fill in free-form debug info specific to this fence, like |
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* the sequence number. |
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* |
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* This callback is optional. |
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*/ |
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void (*fence_value_str)(struct dma_fence *fence, char *str, int size); |
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/** |
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* @timeline_value_str: |
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* |
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* Fills in the current value of the timeline as a string, like the |
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* sequence number. Note that the specific fence passed to this function |
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* should not matter, drivers should only use it to look up the |
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* corresponding timeline structures. |
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*/ |
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void (*timeline_value_str)(struct dma_fence *fence, |
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char *str, int size); |
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}; |
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void dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops, |
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spinlock_t *lock, u64 context, u64 seqno); |
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void dma_fence_release(struct kref *kref); |
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void dma_fence_free(struct dma_fence *fence); |
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/** |
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* dma_fence_put - decreases refcount of the fence |
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* @fence: fence to reduce refcount of |
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*/ |
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static inline void dma_fence_put(struct dma_fence *fence) |
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{ |
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if (fence) |
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kref_put(&fence->refcount, dma_fence_release); |
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} |
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/** |
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* dma_fence_get - increases refcount of the fence |
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* @fence: fence to increase refcount of |
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* |
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* Returns the same fence, with refcount increased by 1. |
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*/ |
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static inline struct dma_fence *dma_fence_get(struct dma_fence *fence) |
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{ |
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if (fence) |
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kref_get(&fence->refcount); |
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return fence; |
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} |
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/** |
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* dma_fence_get_rcu - get a fence from a dma_resv_list with |
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* rcu read lock |
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* @fence: fence to increase refcount of |
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* |
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* Function returns NULL if no refcount could be obtained, or the fence. |
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*/ |
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static inline struct dma_fence *dma_fence_get_rcu(struct dma_fence *fence) |
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{ |
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if (kref_get_unless_zero(&fence->refcount)) |
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return fence; |
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else |
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return NULL; |
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} |
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/** |
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* dma_fence_get_rcu_safe - acquire a reference to an RCU tracked fence |
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* @fencep: pointer to fence to increase refcount of |
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* |
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* Function returns NULL if no refcount could be obtained, or the fence. |
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* This function handles acquiring a reference to a fence that may be |
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* reallocated within the RCU grace period (such as with SLAB_TYPESAFE_BY_RCU), |
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* so long as the caller is using RCU on the pointer to the fence. |
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* |
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* An alternative mechanism is to employ a seqlock to protect a bunch of |
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* fences, such as used by struct dma_resv. When using a seqlock, |
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* the seqlock must be taken before and checked after a reference to the |
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* fence is acquired (as shown here). |
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* |
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* The caller is required to hold the RCU read lock. |
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*/ |
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static inline struct dma_fence * |
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dma_fence_get_rcu_safe(struct dma_fence __rcu **fencep) |
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{ |
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do { |
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struct dma_fence *fence; |
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fence = rcu_dereference(*fencep); |
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if (!fence) |
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return NULL; |
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if (!dma_fence_get_rcu(fence)) |
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continue; |
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/* The atomic_inc_not_zero() inside dma_fence_get_rcu() |
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* provides a full memory barrier upon success (such as now). |
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* This is paired with the write barrier from assigning |
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* to the __rcu protected fence pointer so that if that |
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* pointer still matches the current fence, we know we |
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* have successfully acquire a reference to it. If it no |
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* longer matches, we are holding a reference to some other |
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* reallocated pointer. This is possible if the allocator |
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* is using a freelist like SLAB_TYPESAFE_BY_RCU where the |
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* fence remains valid for the RCU grace period, but it |
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* may be reallocated. When using such allocators, we are |
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* responsible for ensuring the reference we get is to |
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* the right fence, as below. |
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*/ |
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if (fence == rcu_access_pointer(*fencep)) |
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return rcu_pointer_handoff(fence); |
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dma_fence_put(fence); |
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} while (1); |
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} |
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#ifdef CONFIG_LOCKDEP |
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bool dma_fence_begin_signalling(void); |
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void dma_fence_end_signalling(bool cookie); |
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void __dma_fence_might_wait(void); |
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#else |
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static inline bool dma_fence_begin_signalling(void) |
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{ |
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return true; |
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} |
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static inline void dma_fence_end_signalling(bool cookie) {} |
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static inline void __dma_fence_might_wait(void) {} |
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#endif |
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int dma_fence_signal(struct dma_fence *fence); |
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int dma_fence_signal_locked(struct dma_fence *fence); |
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int dma_fence_signal_timestamp(struct dma_fence *fence, ktime_t timestamp); |
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int dma_fence_signal_timestamp_locked(struct dma_fence *fence, |
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ktime_t timestamp); |
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signed long dma_fence_default_wait(struct dma_fence *fence, |
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bool intr, signed long timeout); |
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int dma_fence_add_callback(struct dma_fence *fence, |
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struct dma_fence_cb *cb, |
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dma_fence_func_t func); |
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bool dma_fence_remove_callback(struct dma_fence *fence, |
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struct dma_fence_cb *cb); |
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void dma_fence_enable_sw_signaling(struct dma_fence *fence); |
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/** |
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* dma_fence_is_signaled_locked - Return an indication if the fence |
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* is signaled yet. |
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* @fence: the fence to check |
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* |
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* Returns true if the fence was already signaled, false if not. Since this |
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* function doesn't enable signaling, it is not guaranteed to ever return |
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* true if dma_fence_add_callback(), dma_fence_wait() or |
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* dma_fence_enable_sw_signaling() haven't been called before. |
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* |
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* This function requires &dma_fence.lock to be held. |
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* |
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* See also dma_fence_is_signaled(). |
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*/ |
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static inline bool |
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dma_fence_is_signaled_locked(struct dma_fence *fence) |
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{ |
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if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) |
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return true; |
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if (fence->ops->signaled && fence->ops->signaled(fence)) { |
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dma_fence_signal_locked(fence); |
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return true; |
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} |
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return false; |
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} |
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/** |
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* dma_fence_is_signaled - Return an indication if the fence is signaled yet. |
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* @fence: the fence to check |
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* |
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* Returns true if the fence was already signaled, false if not. Since this |
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* function doesn't enable signaling, it is not guaranteed to ever return |
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* true if dma_fence_add_callback(), dma_fence_wait() or |
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* dma_fence_enable_sw_signaling() haven't been called before. |
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* |
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* It's recommended for seqno fences to call dma_fence_signal when the |
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* operation is complete, it makes it possible to prevent issues from |
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* wraparound between time of issue and time of use by checking the return |
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* value of this function before calling hardware-specific wait instructions. |
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* |
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* See also dma_fence_is_signaled_locked(). |
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*/ |
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static inline bool |
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dma_fence_is_signaled(struct dma_fence *fence) |
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{ |
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if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) |
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return true; |
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if (fence->ops->signaled && fence->ops->signaled(fence)) { |
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dma_fence_signal(fence); |
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return true; |
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} |
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return false; |
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} |
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/** |
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* __dma_fence_is_later - return if f1 is chronologically later than f2 |
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* @f1: the first fence's seqno |
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* @f2: the second fence's seqno from the same context |
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* @ops: dma_fence_ops associated with the seqno |
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* |
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* Returns true if f1 is chronologically later than f2. Both fences must be |
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* from the same context, since a seqno is not common across contexts. |
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*/ |
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static inline bool __dma_fence_is_later(u64 f1, u64 f2, |
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const struct dma_fence_ops *ops) |
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{ |
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/* This is for backward compatibility with drivers which can only handle |
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* 32bit sequence numbers. Use a 64bit compare when the driver says to |
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* do so. |
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*/ |
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if (ops->use_64bit_seqno) |
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return f1 > f2; |
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return (int)(lower_32_bits(f1) - lower_32_bits(f2)) > 0; |
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} |
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/** |
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* dma_fence_is_later - return if f1 is chronologically later than f2 |
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* @f1: the first fence from the same context |
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* @f2: the second fence from the same context |
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* |
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* Returns true if f1 is chronologically later than f2. Both fences must be |
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* from the same context, since a seqno is not re-used across contexts. |
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*/ |
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static inline bool dma_fence_is_later(struct dma_fence *f1, |
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struct dma_fence *f2) |
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{ |
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if (WARN_ON(f1->context != f2->context)) |
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return false; |
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return __dma_fence_is_later(f1->seqno, f2->seqno, f1->ops); |
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} |
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/** |
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* dma_fence_later - return the chronologically later fence |
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* @f1: the first fence from the same context |
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* @f2: the second fence from the same context |
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* |
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* Returns NULL if both fences are signaled, otherwise the fence that would be |
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* signaled last. Both fences must be from the same context, since a seqno is |
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* not re-used across contexts. |
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*/ |
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static inline struct dma_fence *dma_fence_later(struct dma_fence *f1, |
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struct dma_fence *f2) |
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{ |
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if (WARN_ON(f1->context != f2->context)) |
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return NULL; |
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|
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/* |
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* Can't check just DMA_FENCE_FLAG_SIGNALED_BIT here, it may never |
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* have been set if enable_signaling wasn't called, and enabling that |
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* here is overkill. |
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*/ |
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if (dma_fence_is_later(f1, f2)) |
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return dma_fence_is_signaled(f1) ? NULL : f1; |
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else |
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return dma_fence_is_signaled(f2) ? NULL : f2; |
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} |
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|
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/** |
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* dma_fence_get_status_locked - returns the status upon completion |
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* @fence: the dma_fence to query |
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* |
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* Drivers can supply an optional error status condition before they signal |
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* the fence (to indicate whether the fence was completed due to an error |
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* rather than success). The value of the status condition is only valid |
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* if the fence has been signaled, dma_fence_get_status_locked() first checks |
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* the signal state before reporting the error status. |
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* |
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* Returns 0 if the fence has not yet been signaled, 1 if the fence has |
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* been signaled without an error condition, or a negative error code |
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* if the fence has been completed in err. |
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*/ |
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static inline int dma_fence_get_status_locked(struct dma_fence *fence) |
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{ |
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if (dma_fence_is_signaled_locked(fence)) |
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return fence->error ?: 1; |
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else |
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return 0; |
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} |
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int dma_fence_get_status(struct dma_fence *fence); |
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/** |
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* dma_fence_set_error - flag an error condition on the fence |
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* @fence: the dma_fence |
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* @error: the error to store |
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* |
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* Drivers can supply an optional error status condition before they signal |
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* the fence, to indicate that the fence was completed due to an error |
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* rather than success. This must be set before signaling (so that the value |
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* is visible before any waiters on the signal callback are woken). This |
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* helper exists to help catching erroneous setting of #dma_fence.error. |
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*/ |
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static inline void dma_fence_set_error(struct dma_fence *fence, |
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int error) |
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{ |
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WARN_ON(test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)); |
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WARN_ON(error >= 0 || error < -MAX_ERRNO); |
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fence->error = error; |
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} |
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signed long dma_fence_wait_timeout(struct dma_fence *, |
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bool intr, signed long timeout); |
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signed long dma_fence_wait_any_timeout(struct dma_fence **fences, |
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uint32_t count, |
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bool intr, signed long timeout, |
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uint32_t *idx); |
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/** |
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* dma_fence_wait - sleep until the fence gets signaled |
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* @fence: the fence to wait on |
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* @intr: if true, do an interruptible wait |
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* |
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* This function will return -ERESTARTSYS if interrupted by a signal, |
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* or 0 if the fence was signaled. Other error values may be |
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* returned on custom implementations. |
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* |
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* Performs a synchronous wait on this fence. It is assumed the caller |
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* directly or indirectly holds a reference to the fence, otherwise the |
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* fence might be freed before return, resulting in undefined behavior. |
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* |
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* See also dma_fence_wait_timeout() and dma_fence_wait_any_timeout(). |
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*/ |
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static inline signed long dma_fence_wait(struct dma_fence *fence, bool intr) |
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{ |
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signed long ret; |
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/* Since dma_fence_wait_timeout cannot timeout with |
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* MAX_SCHEDULE_TIMEOUT, only valid return values are |
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* -ERESTARTSYS and MAX_SCHEDULE_TIMEOUT. |
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*/ |
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ret = dma_fence_wait_timeout(fence, intr, MAX_SCHEDULE_TIMEOUT); |
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return ret < 0 ? ret : 0; |
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} |
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struct dma_fence *dma_fence_get_stub(void); |
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u64 dma_fence_context_alloc(unsigned num); |
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#define DMA_FENCE_TRACE(f, fmt, args...) \ |
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do { \ |
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struct dma_fence *__ff = (f); \ |
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if (IS_ENABLED(CONFIG_DMA_FENCE_TRACE)) \ |
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pr_info("f %llu#%llu: " fmt, \ |
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__ff->context, __ff->seqno, ##args); \ |
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} while (0) |
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#define DMA_FENCE_WARN(f, fmt, args...) \ |
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do { \ |
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struct dma_fence *__ff = (f); \ |
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pr_warn("f %llu#%llu: " fmt, __ff->context, __ff->seqno,\ |
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##args); \ |
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} while (0) |
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#define DMA_FENCE_ERR(f, fmt, args...) \ |
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do { \ |
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struct dma_fence *__ff = (f); \ |
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pr_err("f %llu#%llu: " fmt, __ff->context, __ff->seqno, \ |
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##args); \ |
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} while (0) |
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#endif /* __LINUX_DMA_FENCE_H */
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