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208 lines
6.7 KiB
208 lines
6.7 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright © 2006, Intel Corporation. |
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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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/* on architectures without dma-mapping capabilities we need to ensure |
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* that the asynchronous path compiles away |
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*/ |
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#ifdef CONFIG_HAS_DMA |
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#define __async_inline |
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#else |
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#define __async_inline __always_inline |
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#endif |
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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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* 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_FENCE: specify that the next operation in the dependency |
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* chain uses this operation's result as an input |
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* @ASYNC_TX_PQ_XOR_DST: do not overwrite the syndrome but XOR it with the |
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* input data. Required for rmw case. |
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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 << 2), |
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ASYNC_TX_FENCE = (1 << 3), |
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ASYNC_TX_PQ_XOR_DST = (1 << 4), |
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}; |
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/** |
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* struct async_submit_ctl - async_tx submission/completion modifiers |
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* @flags: submission modifiers |
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* @depend_tx: parent dependency of the current operation being submitted |
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* @cb_fn: callback routine to run at operation completion |
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* @cb_param: parameter for the callback routine |
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* @scribble: caller provided space for dma/page address conversions |
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*/ |
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struct async_submit_ctl { |
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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; |
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void *cb_param; |
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void *scribble; |
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}; |
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#if defined(CONFIG_DMA_ENGINE) && !defined(CONFIG_ASYNC_TX_CHANNEL_SWITCH) |
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#define async_tx_issue_pending_all dma_issue_pending_all |
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/** |
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* async_tx_issue_pending - send pending descriptor to the hardware channel |
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* @tx: descriptor handle to retrieve hardware context |
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* |
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* Note: any dependent operations will have already been issued by |
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* async_tx_channel_switch, or (in the case of no channel switch) will |
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* be already pending on this channel. |
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*/ |
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static inline void async_tx_issue_pending(struct dma_async_tx_descriptor *tx) |
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{ |
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if (likely(tx)) { |
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struct dma_chan *chan = tx->chan; |
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struct dma_device *dma = chan->device; |
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dma->device_issue_pending(chan); |
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} |
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} |
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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 async_submit_ctl *submit, |
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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 void async_tx_issue_pending(struct dma_async_tx_descriptor *tx) |
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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 async_submit_ctl *submit, |
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enum dma_transaction_type tx_type, struct page **dst, |
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int dst_count, struct page **src, int src_count, |
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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(struct async_submit_ctl *submit) |
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{ |
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if (submit->cb_fn) |
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submit->cb_fn(submit->cb_param); |
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} |
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typedef union { |
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unsigned long addr; |
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struct page *page; |
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dma_addr_t dma; |
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} addr_conv_t; |
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static inline void |
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init_async_submit(struct async_submit_ctl *args, enum async_tx_flags flags, |
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struct dma_async_tx_descriptor *tx, |
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dma_async_tx_callback cb_fn, void *cb_param, |
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addr_conv_t *scribble) |
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{ |
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args->flags = flags; |
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args->depend_tx = tx; |
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args->cb_fn = cb_fn; |
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args->cb_param = cb_param; |
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args->scribble = scribble; |
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} |
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void async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx, |
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struct async_submit_ctl *submit); |
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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, struct async_submit_ctl *submit); |
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struct dma_async_tx_descriptor * |
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async_xor_offs(struct page *dest, unsigned int offset, |
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struct page **src_list, unsigned int *src_offset, |
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int src_cnt, size_t len, struct async_submit_ctl *submit); |
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struct dma_async_tx_descriptor * |
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async_xor_val(struct page *dest, struct page **src_list, unsigned int offset, |
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int src_cnt, size_t len, enum sum_check_flags *result, |
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struct async_submit_ctl *submit); |
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struct dma_async_tx_descriptor * |
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async_xor_val_offs(struct page *dest, unsigned int offset, |
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struct page **src_list, unsigned int *src_offset, |
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int src_cnt, size_t len, enum sum_check_flags *result, |
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struct async_submit_ctl *submit); |
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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, |
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struct async_submit_ctl *submit); |
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struct dma_async_tx_descriptor *async_trigger_callback(struct async_submit_ctl *submit); |
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struct dma_async_tx_descriptor * |
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async_gen_syndrome(struct page **blocks, unsigned int *offsets, int src_cnt, |
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size_t len, struct async_submit_ctl *submit); |
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struct dma_async_tx_descriptor * |
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async_syndrome_val(struct page **blocks, unsigned int *offsets, int src_cnt, |
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size_t len, enum sum_check_flags *pqres, struct page *spare, |
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unsigned int s_off, struct async_submit_ctl *submit); |
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struct dma_async_tx_descriptor * |
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async_raid6_2data_recov(int src_num, size_t bytes, int faila, int failb, |
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struct page **ptrs, unsigned int *offs, |
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struct async_submit_ctl *submit); |
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struct dma_async_tx_descriptor * |
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async_raid6_datap_recov(int src_num, size_t bytes, int faila, |
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struct page **ptrs, unsigned int *offs, |
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struct async_submit_ctl *submit); |
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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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