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-rw-r--r--include/linux/async_tx.h208
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diff --git a/include/linux/async_tx.h b/include/linux/async_tx.h
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+/*
+ * 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_ */