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Diffstat (limited to 'include/linux/async_tx.h')
| -rw-r--r-- | include/linux/async_tx.h | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h new file mode 100644 index 000000000..388574ea3 --- /dev/null +++ b/include/linux/async_tx.h @@ -0,0 +1,208 @@ +/* + * 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> + +/* 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 + * 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; +}; + +#ifdef CONFIG_DMA_ENGINE +#define async_tx_issue_pending_all dma_issue_pending_all + +/** + * 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. + */ +static inline void 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; + + dma->device_issue_pending(chan); + } +} +#ifdef CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL +#include <asm/async_tx.h> +#else +#define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \ + __async_tx_find_channel(dep, type) +struct dma_chan * +__async_tx_find_channel(struct async_submit_ctl *submit, + enum dma_transaction_type tx_type); +#endif /* CONFIG_ARCH_HAS_ASYNC_TX_FIND_CHANNEL */ +#else +static inline void async_tx_issue_pending_all(void) +{ + do { } while (0); +} + +static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx) +{ + do { } while (0); +} + +static inline struct dma_chan * +async_tx_find_channel(struct async_submit_ctl *submit, + enum dma_transaction_type tx_type, struct page **dst, + int dst_count, struct page **src, int src_count, + size_t len) +{ + return NULL; +} +#endif + +/** + * 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 + */ +static inline void +async_tx_sync_epilog(struct async_submit_ctl *submit) +{ + if (submit->cb_fn) + submit->cb_fn(submit->cb_param); +} + +typedef union { + unsigned long addr; + struct page *page; + dma_addr_t dma; +} addr_conv_t; + +static inline void +init_async_submit(struct async_submit_ctl *args, enum async_tx_flags flags, + struct dma_async_tx_descriptor *tx, + dma_async_tx_callback cb_fn, void *cb_param, + addr_conv_t *scribble) +{ + args->flags = flags; + args->depend_tx = tx; + args->cb_fn = cb_fn; + args->cb_param = cb_param; + args->scribble = scribble; +} + +void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, + struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_xor(struct page *dest, struct page **src_list, unsigned int offset, + int src_cnt, size_t len, struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, + int src_cnt, size_t len, enum sum_check_flags *result, + struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset, + unsigned int src_offset, size_t len, + struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_gen_syndrome(struct page **blocks, unsigned int offset, int src_cnt, + size_t len, struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_syndrome_val(struct page **blocks, unsigned int offset, int src_cnt, + size_t len, enum sum_check_flags *pqres, struct page *spare, + struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_raid6_2data_recov(int src_num, size_t bytes, int faila, int failb, + struct page **ptrs, struct async_submit_ctl *submit); + +struct dma_async_tx_descriptor * +async_raid6_datap_recov(int src_num, size_t bytes, int faila, + struct page **ptrs, struct async_submit_ctl *submit); + +void async_tx_quiesce(struct dma_async_tx_descriptor **tx); +#endif /* _ASYNC_TX_H_ */ |