forked from Minki/linux
2ba05622b8
async_tx and net_dma each have open-coded versions of issue_pending_all, so provide a common routine in dmaengine. The implementation needs to walk the global device list, so implement rcu to allow dma_issue_pending_all to run lockless. Clients protect themselves from channel removal events by holding a dmaengine reference. Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
136 lines
4.7 KiB
C
136 lines
4.7 KiB
C
/*
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* Copyright © 2006, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#ifndef _ASYNC_TX_H_
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#define _ASYNC_TX_H_
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#include <linux/dmaengine.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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/**
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* dma_chan_ref - object used to manage dma channels received from the
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* dmaengine core.
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* @chan - the channel being tracked
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* @node - node for the channel to be placed on async_tx_master_list
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* @rcu - for list_del_rcu
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* @count - number of times this channel is listed in the pool
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* (for channels with multiple capabiities)
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*/
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struct dma_chan_ref {
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struct dma_chan *chan;
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struct list_head node;
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struct rcu_head rcu;
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atomic_t count;
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};
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/**
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* async_tx_flags - modifiers for the async_* calls
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* @ASYNC_TX_XOR_ZERO_DST: this flag must be used for xor operations where the
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* the destination address is not a source. The asynchronous case handles this
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* implicitly, the synchronous case needs to zero the destination block.
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* @ASYNC_TX_XOR_DROP_DST: this flag must be used if the destination address is
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* also one of the source addresses. In the synchronous case the destination
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* address is an implied source, whereas the asynchronous case it must be listed
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* as a source. The destination address must be the first address in the source
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* array.
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* @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a
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* dependency chain
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* @ASYNC_TX_DEP_ACK: ack the dependency descriptor. Useful for chaining.
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*/
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enum async_tx_flags {
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ASYNC_TX_XOR_ZERO_DST = (1 << 0),
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ASYNC_TX_XOR_DROP_DST = (1 << 1),
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ASYNC_TX_ACK = (1 << 3),
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ASYNC_TX_DEP_ACK = (1 << 4),
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};
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#ifdef CONFIG_DMA_ENGINE
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#define async_tx_issue_pending_all dma_issue_pending_all
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#ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL
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#include <asm/async_tx.h>
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#else
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#define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
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__async_tx_find_channel(dep, type)
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struct dma_chan *
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__async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
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enum dma_transaction_type tx_type);
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#endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */
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#else
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static inline void async_tx_issue_pending_all(void)
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{
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do { } while (0);
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}
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static inline struct dma_chan *
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async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
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enum dma_transaction_type tx_type, struct page **dst, int dst_count,
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struct page **src, int src_count, size_t len)
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{
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return NULL;
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}
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#endif
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/**
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* async_tx_sync_epilog - actions to take if an operation is run synchronously
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* @cb_fn: function to call when the transaction completes
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* @cb_fn_param: parameter to pass to the callback routine
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*/
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static inline void
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async_tx_sync_epilog(dma_async_tx_callback cb_fn, void *cb_fn_param)
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{
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if (cb_fn)
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cb_fn(cb_fn_param);
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}
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void
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async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
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enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx,
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dma_async_tx_callback cb_fn, void *cb_fn_param);
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struct dma_async_tx_descriptor *
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async_xor(struct page *dest, struct page **src_list, unsigned int offset,
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int src_cnt, size_t len, enum async_tx_flags flags,
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struct dma_async_tx_descriptor *depend_tx,
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dma_async_tx_callback cb_fn, void *cb_fn_param);
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struct dma_async_tx_descriptor *
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async_xor_zero_sum(struct page *dest, struct page **src_list,
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unsigned int offset, int src_cnt, size_t len,
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u32 *result, enum async_tx_flags flags,
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struct dma_async_tx_descriptor *depend_tx,
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dma_async_tx_callback cb_fn, void *cb_fn_param);
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struct dma_async_tx_descriptor *
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async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
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unsigned int src_offset, size_t len, enum async_tx_flags flags,
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struct dma_async_tx_descriptor *depend_tx,
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dma_async_tx_callback cb_fn, void *cb_fn_param);
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struct dma_async_tx_descriptor *
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async_memset(struct page *dest, int val, unsigned int offset,
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size_t len, enum async_tx_flags flags,
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struct dma_async_tx_descriptor *depend_tx,
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dma_async_tx_callback cb_fn, void *cb_fn_param);
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struct dma_async_tx_descriptor *
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async_trigger_callback(enum async_tx_flags flags,
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struct dma_async_tx_descriptor *depend_tx,
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dma_async_tx_callback cb_fn, void *cb_fn_param);
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void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
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#endif /* _ASYNC_TX_H_ */
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