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dmaengine: ack to flags: make use of the unused bits in the 'ack' field

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'ack' is currently a simple integer that flags whether or not a client is done
touching fields in the given descriptor.  It is effectively just a single bit
of information.  Converting this to a flags parameter allows the other bits to
be put to use to control completion actions, like dma-unmap, and capture
results, like xor-zero-sum == 0.

Changes are one of:
1/ convert all open-coded ->ack manipulations to use async_tx_ack
   and async_tx_test_ack.
2/ set the ack bit at prep time where possible
3/ make drivers store the flags at prep time
4/ add flags to the device_prep_dma_interrupt prototype

Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2008-04-17 20:17:26 -07:00
parent c4fe15541d
commit 636bdeaa12
8 changed files with 69 additions and 54 deletions
Download patch file Download diff file Expand all files Collapse all files

25
include/linux/dmaengine.h
View file

@ -95,12 +95,17 @@ enum dma_transaction_type {
#define DMA_TX_TYPE_END (DMA_INTERRUPT + 1)
/**
* enum dma_prep_flags - DMA flags to augment operation preparation
* enum dma_ctrl_flags - DMA flags to augment operation preparation,
* control completion, and communicate status.
* @DMA_PREP_INTERRUPT - trigger an interrupt (callback) upon completion of
* this transaction
* @DMA_CTRL_ACK - the descriptor cannot be reused until the client
* acknowledges receipt, i.e. has has a chance to establish any
* dependency chains
*/
enum dma_prep_flags {
enum dma_ctrl_flags {
DMA_PREP_INTERRUPT = (1 << 0),
DMA_CTRL_ACK = (1 << 1),
};
/**
@ -211,8 +216,8 @@ typedef void (*dma_async_tx_callback)(void *dma_async_param);
* ---dma generic offload fields---
* @cookie: tracking cookie for this transaction, set to -EBUSY if
* this tx is sitting on a dependency list
* @ack: the descriptor can not be reused until the client acknowledges
* receipt, i.e. has has a chance to establish any dependency chains
* @flags: flags to augment operation preparation, control completion, and
* communicate status
* @phys: physical address of the descriptor
* @tx_list: driver common field for operations that require multiple
* descriptors
@ -227,7 +232,7 @@ typedef void (*dma_async_tx_callback)(void *dma_async_param);
*/
struct dma_async_tx_descriptor {
dma_cookie_t cookie;
int ack;
enum dma_ctrl_flags flags; /* not a 'long' to pack with cookie */
dma_addr_t phys;
struct list_head tx_list;
struct dma_chan *chan;
@ -290,7 +295,7 @@ struct dma_device {
struct dma_chan *chan, dma_addr_t dest, int value, size_t len,
unsigned long flags);
struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)(
struct dma_chan *chan);
struct dma_chan *chan, unsigned long flags);
enum dma_status (*device_is_tx_complete)(struct dma_chan *chan,
dma_cookie_t cookie, dma_cookie_t *last,
@ -316,7 +321,13 @@ void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
static inline void
async_tx_ack(struct dma_async_tx_descriptor *tx)
{
tx->ack = 1;
tx->flags |= DMA_CTRL_ACK;
}
static inline int
async_tx_test_ack(struct dma_async_tx_descriptor *tx)
{
return tx->flags & DMA_CTRL_ACK;
}
#define first_dma_cap(mask) __first_dma_cap(&(mask))