| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * Copyright © 2006, Intel Corporation. |
| */ |
| #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 |
| * 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; |
| }; |
| |
| #if defined(CONFIG_DMA_ENGINE) && !defined(CONFIG_ASYNC_TX_CHANNEL_SWITCH) |
| #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_offs(struct page *dest, unsigned int offset, |
| struct page **src_list, unsigned int *src_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_xor_val_offs(struct page *dest, unsigned int offset, |
| struct page **src_list, unsigned int *src_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 *offsets, int src_cnt, |
| size_t len, struct async_submit_ctl *submit); |
| |
| struct dma_async_tx_descriptor * |
| async_syndrome_val(struct page **blocks, unsigned int *offsets, int src_cnt, |
| size_t len, enum sum_check_flags *pqres, struct page *spare, |
| unsigned int s_off, 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, unsigned int *offs, |
| 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, unsigned int *offs, |
| struct async_submit_ctl *submit); |
| |
| void async_tx_quiesce(struct dma_async_tx_descriptor **tx); |
| #endif /* _ASYNC_TX_H_ */ |