/* * Copyright © 2006, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. * */ #ifndef _ASYNC_TX_H_ #define _ASYNC_TX_H_ #include <linux/dmaengine.h> #include <linux/spinlock.h> #include <linux/interrupt.h> /** * 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 * 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_ASSUME_COHERENT: skip cache maintenance operations * @ASYNC_TX_ACK: immediately ack the descriptor, precludes setting up a * dependency chain * @ASYNC_TX_DEP_ACK: ack the dependency descriptor. Useful for chaining. * @ASYNC_TX_KMAP_SRC: if the transaction is to be performed synchronously * take an atomic mapping (KM_USER0) on the source page(s) * @ASYNC_TX_KMAP_DST: if the transaction is to be performed synchronously * take an atomic mapping (KM_USER0) on the dest page(s) */ enum async_tx_flags { ASYNC_TX_XOR_ZERO_DST = (1 << 0), ASYNC_TX_XOR_DROP_DST = (1 << 1), ASYNC_TX_ASSUME_COHERENT = (1 << 2), ASYNC_TX_ACK = (1 << 3), ASYNC_TX_DEP_ACK = (1 << 4), ASYNC_TX_KMAP_SRC = (1 << 5), ASYNC_TX_KMAP_DST = (1 << 6), }; #ifdef CONFIG_DMA_ENGINE void async_tx_issue_pending_all(void); enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx); void async_tx_run_dependencies(struct dma_async_tx_descriptor *tx); struct dma_chan * async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, enum dma_transaction_type tx_type); #else static inline void async_tx_issue_pending_all(void) { do { } while (0); } static inline enum dma_status dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx) { return DMA_SUCCESS; } static inline void async_tx_run_dependencies(struct dma_async_tx_descriptor *tx, struct dma_chan *host_chan) { do { } while (0); } static inline struct dma_chan * async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx, enum dma_transaction_type tx_type) { return NULL; } #endif /** * async_tx_sync_epilog - actions to take if an operation is run synchronously * @flags: async_tx flags * @depend_tx: transaction depends on depend_tx * @cb_fn: function to call when the transaction completes * @cb_fn_param: parameter to pass to the callback routine */ static inline void async_tx_sync_epilog(unsigned long flags, struct dma_async_tx_descriptor *depend_tx, dma_async_tx_callback cb_fn, void *cb_fn_param) { if (cb_fn) cb_fn(cb_fn_param); if (depend_tx && (flags & ASYNC_TX_DEP_ACK)) async_tx_ack(depend_tx); } void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, dma_async_tx_callback cb_fn, void *cb_fn_param); struct dma_async_tx_descriptor * async_xor(struct page *dest, struct page **src_list, unsigned int offset, int src_cnt, size_t len, enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, dma_async_tx_callback cb_fn, void *cb_fn_param); struct dma_async_tx_descriptor * async_xor_zero_sum(struct page *dest, struct page **src_list, unsigned int offset, int src_cnt, size_t len, u32 *result, enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, dma_async_tx_callback cb_fn, void *cb_fn_param); struct dma_async_tx_descriptor * async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, unsigned int src_offset, size_t len, enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, dma_async_tx_callback cb_fn, void *cb_fn_param); struct dma_async_tx_descriptor * async_memset(struct page *dest, int val, unsigned int offset, size_t len, enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, dma_async_tx_callback cb_fn, void *cb_fn_param); struct dma_async_tx_descriptor * async_trigger_callback(enum async_tx_flags flags, struct dma_async_tx_descriptor *depend_tx, dma_async_tx_callback cb_fn, void *cb_fn_param); #endif /* _ASYNC_TX_H_ */