mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 12:20:52 +07:00
2ba05622b8
async_tx and net_dma each have open-coded versions of issue_pending_all, so provide a common routine in dmaengine. The implementation needs to walk the global device list, so implement rcu to allow dma_issue_pending_all to run lockless. Clients protect themselves from channel removal events by holding a dmaengine reference. Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
136 lines
4.7 KiB
C
136 lines
4.7 KiB
C
/*
|
|
* 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_ACK: immediately ack the descriptor, precludes setting up a
|
|
* dependency chain
|
|
* @ASYNC_TX_DEP_ACK: ack the dependency descriptor. Useful for chaining.
|
|
*/
|
|
enum async_tx_flags {
|
|
ASYNC_TX_XOR_ZERO_DST = (1 << 0),
|
|
ASYNC_TX_XOR_DROP_DST = (1 << 1),
|
|
ASYNC_TX_ACK = (1 << 3),
|
|
ASYNC_TX_DEP_ACK = (1 << 4),
|
|
};
|
|
|
|
#ifdef CONFIG_DMA_ENGINE
|
|
#define async_tx_issue_pending_all dma_issue_pending_all
|
|
#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 dma_async_tx_descriptor *depend_tx,
|
|
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 struct dma_chan *
|
|
async_tx_find_channel(struct dma_async_tx_descriptor *depend_tx,
|
|
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(dma_async_tx_callback cb_fn, void *cb_fn_param)
|
|
{
|
|
if (cb_fn)
|
|
cb_fn(cb_fn_param);
|
|
}
|
|
|
|
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);
|
|
|
|
void async_tx_quiesce(struct dma_async_tx_descriptor **tx);
|
|
#endif /* _ASYNC_TX_H_ */
|