/* on architectures without dma-mapping capabilities we need to ensure * that the asynchronous path compiles away
*/ #ifdef CONFIG_HAS_DMA #define __async_inline #else #define __async_inline __always_inline #endif
/** * dma_chan_ref - object used to manage dma channels received from the * dmaengine core. * @chan - the channel being tracked * @node - node for the channel to be placed on async_tx_master_list * @rcu - for list_del_rcu * @count - number of times this channel is listed in the pool * (for channels with multiple capabiities)
*/ struct dma_chan_ref { struct dma_chan *chan; struct list_head node; struct rcu_head rcu;
atomic_t count;
};
/** * async_tx_flags - modifiers for the async_* calls * @ASYNC_TX_XOR_ZERO_DST: this flag must be used for xor operations where the * destination address is not a source. The asynchronous case handles this * implicitly, the synchronous case needs to zero the destination block. * @ASYNC_TX_XOR_DROP_DST: this flag must be used if the destination address is * also one of the source addresses. In the synchronous case the destination * address is an implied source, whereas the asynchronous case it must be listed * as a source. The destination address must be the first address in the source * array. * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a * dependency chain * @ASYNC_TX_FENCE: specify that the next operation in the dependency * chain uses this operation's result as an input * @ASYNC_TX_PQ_XOR_DST: do not overwrite the syndrome but XOR it with the * input data. Required for rmw case.
*/ enum async_tx_flags {
ASYNC_TX_XOR_ZERO_DST = (1 << 0),
ASYNC_TX_XOR_DROP_DST = (1 << 1),
ASYNC_TX_ACK = (1 << 2),
ASYNC_TX_FENCE = (1 << 3),
ASYNC_TX_PQ_XOR_DST = (1 << 4),
};
/** * struct async_submit_ctl - async_tx submission/completion modifiers * @flags: submission modifiers * @depend_tx: parent dependency of the current operation being submitted * @cb_fn: callback routine to run at operation completion * @cb_param: parameter for the callback routine * @scribble: caller provided space for dma/page address conversions
*/ struct async_submit_ctl { enum async_tx_flags flags; struct dma_async_tx_descriptor *depend_tx;
dma_async_tx_callback cb_fn; void *cb_param; void *scribble;
};
/** * async_tx_issue_pending - send pending descriptor to the hardware channel * @tx: descriptor handle to retrieve hardware context * * Note: any dependent operations will have already been issued by * async_tx_channel_switch, or (in the case of no channel switch) will * be already pending on this channel.
*/ staticinlinevoid async_tx_issue_pending(struct dma_async_tx_descriptor *tx)
{ if (likely(tx)) { struct dma_chan *chan = tx->chan; struct dma_device *dma = chan->device;
/** * async_tx_sync_epilog - actions to take if an operation is run synchronously * @cb_fn: function to call when the transaction completes * @cb_fn_param: parameter to pass to the callback routine
*/ staticinlinevoid
async_tx_sync_epilog(struct async_submit_ctl *submit)
{ if (submit->cb_fn)
submit->cb_fn(submit->cb_param);
}
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