RE: [PATCH] dmaengine: ack to flags: make use of the unused bits in the'ack' field
From: Sosnowski, Maciej
Date: Wed Mar 19 2008 - 16:03:52 EST
Williams, Dan J wrote:
> '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
>
> Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
> ---
> Next step is to take advantage of these bits to let clients pass hints
> to a dma-driver cleanup routine. How and when to unmap is the first
> candidate.
>
> Compile tested this for x86_64, PPC32, and ARM.
>
> crypto/async_tx/async_memcpy.c | 2 +-
> crypto/async_tx/async_tx.c | 9 +++++----
> crypto/async_tx/async_xor.c | 2 +-
> drivers/dma/dmaengine.c | 12 ++++++------
> drivers/dma/fsldma.c | 8 ++++----
> drivers/dma/ioat_dma.c | 24 ++++++++++++------------
> drivers/dma/iop-adma.c | 39
+++++++++++++++++++++------------------
> include/linux/dmaengine.h | 25 ++++++++++++++++++-------
> 8 files changed, 68 insertions(+), 53 deletions(-)
>
>
> diff --git a/crypto/async_tx/async_memcpy.c
b/crypto/async_tx/async_memcpy.c
> index 84caa4e..a5eda80 100644
> --- a/crypto/async_tx/async_memcpy.c
> +++ b/crypto/async_tx/async_memcpy.c
> @@ -77,7 +77,7 @@ async_memcpy(struct page *dest, struct page *src,
unsigned
> int dest_offset, /* if ack is already set then
we cannot be sure
> * we are referring to the correct operation
> */
> - BUG_ON(depend_tx->ack);
> + BUG_ON(async_tx_test_ack(depend_tx));
> if (dma_wait_for_async_tx(depend_tx) ==
DMA_ERROR)
> panic("%s: DMA_ERROR waiting for
depend_tx\n",
> __func__);
> diff --git a/crypto/async_tx/async_tx.c b/crypto/async_tx/async_tx.c
> index 6975616..c6e772f 100644
> --- a/crypto/async_tx/async_tx.c
> +++ b/crypto/async_tx/async_tx.c
> @@ -446,7 +446,7 @@ async_tx_channel_switch(struct
dma_async_tx_descriptor
> *depend_tx,
> * otherwise poll for completion
> */
> if (dma_has_cap(DMA_INTERRUPT, device->cap_mask))
> - intr_tx = device->device_prep_dma_interrupt(chan);
> + intr_tx = device->device_prep_dma_interrupt(chan, 0);
> else
> intr_tx = NULL;
>
> @@ -515,7 +515,8 @@ async_tx_submit(struct dma_chan *chan, struct
> dma_async_tx_descriptor *tx,
> * 2/ dependencies are 1:1 i.e. two transactions can
> * not depend on the same parent
> */
> - BUG_ON(depend_tx->ack || depend_tx->next || tx->parent);
> + BUG_ON(async_tx_test_ack(depend_tx) || depend_tx->next
||
> + tx->parent);
>
> /* the lock prevents async_tx_run_dependencies from
missing
> * the setting of ->next when ->parent != NULL
> @@ -594,7 +595,7 @@ async_trigger_callback(enum async_tx_flags flags,
> if (device && !dma_has_cap(DMA_INTERRUPT,
device->cap_mask))
> device = NULL;
>
> - tx = device ? device->device_prep_dma_interrupt(chan) :
NULL;
> + tx = device ? device->device_prep_dma_interrupt(chan, 0)
: NULL;
> } else
> tx = NULL;
>
> @@ -610,7 +611,7 @@ async_trigger_callback(enum async_tx_flags flags,
> /* if ack is already set then we cannot be sure
> * we are referring to the correct operation
> */
> - BUG_ON(depend_tx->ack);
> + BUG_ON(async_tx_test_ack(depend_tx));
> if (dma_wait_for_async_tx(depend_tx) ==
DMA_ERROR)
> panic("%s: DMA_ERROR waiting for
depend_tx\n",
> __func__);
> diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
> index 7a9db35..95e1b60 100644
> --- a/crypto/async_tx/async_xor.c
> +++ b/crypto/async_tx/async_xor.c
> @@ -191,7 +191,7 @@ async_xor(struct page *dest, struct page
**src_list,
> unsigned int offset, /* if ack is
already set then we cannot be sure
> * we are referring to the correct
operation
> */
> - BUG_ON(depend_tx->ack);
> + BUG_ON(async_tx_test_ack(depend_tx));
> if (dma_wait_for_async_tx(depend_tx) ==
> DMA_ERROR)
> panic("%s: DMA_ERROR waiting for
"
> diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
> index af6911a..d6dc70f 100644
> --- a/drivers/dma/dmaengine.c
> +++ b/drivers/dma/dmaengine.c
> @@ -478,7 +478,8 @@ dma_async_memcpy_buf_to_buf(struct dma_chan *chan,
void
> *dest,
>
> dma_src = dma_map_single(dev->dev, src, len, DMA_TO_DEVICE);
> dma_dest = dma_map_single(dev->dev, dest, len, DMA_FROM_DEVICE);
> - tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
0);
> + tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
> + DMA_CTRL_ACK);
>
> if (!tx) {
> dma_unmap_single(dev->dev, dma_src, len, DMA_TO_DEVICE);
> @@ -486,7 +487,6 @@ dma_async_memcpy_buf_to_buf(struct dma_chan *chan,
void
> *dest, return -ENOMEM;
> }
>
> - tx->ack = 1;
> tx->callback = NULL;
> cookie = tx->tx_submit(tx);
>
> @@ -524,7 +524,8 @@ dma_async_memcpy_buf_to_pg(struct dma_chan *chan,
struct
> page *page,
>
> dma_src = dma_map_single(dev->dev, kdata, len, DMA_TO_DEVICE);
> dma_dest = dma_map_page(dev->dev, page, offset, len,
DMA_FROM_DEVICE);
> - tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
0);
> + tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
> + DMA_CTRL_ACK);
>
> if (!tx) {
> dma_unmap_single(dev->dev, dma_src, len, DMA_TO_DEVICE);
> @@ -532,7 +533,6 @@ dma_async_memcpy_buf_to_pg(struct dma_chan *chan,
struct
> page *page, return -ENOMEM;
> }
>
> - tx->ack = 1;
> tx->callback = NULL;
> cookie = tx->tx_submit(tx);
>
> @@ -573,7 +573,8 @@ dma_async_memcpy_pg_to_pg(struct dma_chan *chan,
struct
> page *dest_pg, dma_src = dma_map_page(dev->dev, src_pg, src_off,
len,
> DMA_TO_DEVICE); dma_dest = dma_map_page(dev->dev, dest_pg,
dest_off, len,
> DMA_FROM_DEVICE);
> - tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
0);
> + tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
> + DMA_CTRL_ACK);
>
> if (!tx) {
> dma_unmap_page(dev->dev, dma_src, len, DMA_TO_DEVICE);
> @@ -581,7 +582,6 @@ dma_async_memcpy_pg_to_pg(struct dma_chan *chan,
struct
> page *dest_pg, return -ENOMEM;
> }
>
> - tx->ack = 1;
> tx->callback = NULL;
> cookie = tx->tx_submit(tx);
>
> diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
> index ecc1728..4c9b46b 100644
> --- a/drivers/dma/fsldma.c
> +++ b/drivers/dma/fsldma.c
> @@ -407,7 +407,7 @@ static void fsl_dma_free_chan_resources(struct
dma_chan
> *chan) }
>
> static struct dma_async_tx_descriptor *
> -fsl_dma_prep_interrupt(struct dma_chan *chan)
> +fsl_dma_prep_interrupt(struct dma_chan *chan, unsigned long flags)
> {
> struct fsl_dma_chan *fsl_chan;
> struct fsl_desc_sw *new;
> @@ -424,7 +424,7 @@ fsl_dma_prep_interrupt(struct dma_chan *chan)
> }
>
> new->async_tx.cookie = -EBUSY;
> - new->async_tx.ack = 0;
> + new->async_tx.flags = flags;
>
> /* Set End-of-link to the last link descriptor of new list*/
> set_ld_eol(fsl_chan, new);
> @@ -474,7 +474,7 @@ static struct dma_async_tx_descriptor
> *fsl_dma_prep_memcpy( set_desc_next(fsl_chan,
&prev->hw,
> new->async_tx.phys);
>
> new->async_tx.cookie = 0;
> - new->async_tx.ack = 1;
> + async_tx_ack(&new->async_tx);
>
> prev = new;
> len -= copy;
> @@ -485,7 +485,7 @@ static struct dma_async_tx_descriptor
> *fsl_dma_prep_memcpy( list_add_tail(&new->node,
&first->async_tx.tx_list);
> } while (len);
>
> - new->async_tx.ack = 0; /* client is in control of this ack */
> + new->async_tx.flags = flags; /* client is in control of this ack
*/
> new->async_tx.cookie = -EBUSY;
>
> /* Set End-of-link to the last link descriptor of new list*/
> diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
> index 1517fe4..318e8a2 100644
> --- a/drivers/dma/ioat_dma.c
> +++ b/drivers/dma/ioat_dma.c
> @@ -212,14 +212,14 @@ static dma_cookie_t ioat1_tx_submit(struct
> dma_async_tx_descriptor *tx) u32 copy;
> size_t len;
> dma_addr_t src, dst;
> - int orig_ack;
> + unsigned long orig_flags;
> unsigned int desc_count = 0;
>
> /* src and dest and len are stored in the initial descriptor */
> len = first->len;
> src = first->src;
> dst = first->dst;
> - orig_ack = first->async_tx.ack;
> + orig_flags = first->async_tx.flags;
> new = first;
>
> spin_lock_bh(&ioat_chan->desc_lock);
> @@ -228,7 +228,7 @@ static dma_cookie_t ioat1_tx_submit(struct
> dma_async_tx_descriptor *tx) do {
> copy = min_t(size_t, len, ioat_chan->xfercap);
>
> - new->async_tx.ack = 1;
> + async_tx_ack(&new->async_tx);
>
> hw = new->hw;
> hw->size = copy;
> @@ -264,7 +264,7 @@ static dma_cookie_t ioat1_tx_submit(struct
> dma_async_tx_descriptor *tx) }
>
> new->tx_cnt = desc_count;
> - new->async_tx.ack = orig_ack; /* client is in control of this
ack */
> + new->async_tx.flags = orig_flags; /* client is in control of
this ack */
>
> /* store the original values for use in later cleanup */
> if (new != first) {
> @@ -304,14 +304,14 @@ static dma_cookie_t ioat2_tx_submit(struct
> dma_async_tx_descriptor *tx) u32 copy;
> size_t len;
> dma_addr_t src, dst;
> - int orig_ack;
> + unsigned long orig_flags;
> unsigned int desc_count = 0;
>
> /* src and dest and len are stored in the initial descriptor */
> len = first->len;
> src = first->src;
> dst = first->dst;
> - orig_ack = first->async_tx.ack;
> + orig_flags = first->async_tx.flags;
> new = first;
>
> /*
> @@ -321,7 +321,7 @@ static dma_cookie_t ioat2_tx_submit(struct
> dma_async_tx_descriptor *tx) do {
> copy = min_t(size_t, len, ioat_chan->xfercap);
>
> - new->async_tx.ack = 1;
> + async_tx_ack(&new->async_tx);
>
> hw = new->hw;
> hw->size = copy;
> @@ -349,7 +349,7 @@ static dma_cookie_t ioat2_tx_submit(struct
> dma_async_tx_descriptor *tx) }
>
> new->tx_cnt = desc_count;
> - new->async_tx.ack = orig_ack; /* client is in control of this
ack */
> + new->async_tx.flags = orig_flags; /* client is in control of
this ack */
>
> /* store the original values for use in later cleanup */
> if (new != first) {
> @@ -714,7 +714,7 @@ static struct dma_async_tx_descriptor
> *ioat1_dma_prep_memcpy( new->len = len;
> new->dst = dma_dest;
> new->src = dma_src;
> - new->async_tx.ack = 0;
> + new->async_tx.flags = flags;
> return &new->async_tx;
> } else
> return NULL;
> @@ -742,7 +742,7 @@ static struct dma_async_tx_descriptor
> *ioat2_dma_prep_memcpy( new->len = len;
> new->dst = dma_dest;
> new->src = dma_src;
> - new->async_tx.ack = 0;
> + new->async_tx.flags = flags;
> return &new->async_tx;
> } else
> return NULL;
> @@ -842,7 +842,7 @@ static void ioat_dma_memcpy_cleanup(struct
ioat_dma_chan
> *ioat_chan)
> * a completed entry, but not the last,
so clean
> * up if the client is done with the
descriptor
> */
> - if (desc->async_tx.ack) {
> + if (async_tx_test_ack(&desc->async_tx))
{
> list_del(&desc->node);
> list_add_tail(&desc->node,
>
&ioat_chan->free_desc);
> @@ -979,7 +979,7 @@ static void ioat_dma_start_null_desc(struct
ioat_dma_chan
> *ioat_chan) desc->hw->size = 0;
> desc->hw->src_addr = 0;
> desc->hw->dst_addr = 0;
> - desc->async_tx.ack = 1;
> + async_tx_ack(&desc->async_tx);
> switch (ioat_chan->device->version) {
> case IOAT_VER_1_2:
> desc->hw->next = 0;
> diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
> index 9325229..762b729 100644
> --- a/drivers/dma/iop-adma.c
> +++ b/drivers/dma/iop-adma.c
> @@ -111,7 +111,7 @@ iop_adma_clean_slot(struct iop_adma_desc_slot
*desc,
> /* the client is allowed to attach dependent operations
> * until 'ack' is set
> */
> - if (!desc->async_tx.ack)
> + if (!async_tx_test_ack(&desc->async_tx))
> return 0;
>
> /* leave the last descriptor in the chain
> @@ -148,7 +148,7 @@ static void __iop_adma_slot_cleanup(struct
iop_adma_chan
> *iop_chan) "this_desc: %#x next_desc: %#x ack:
%d\n",
> iter->async_tx.cookie, iter->idx, busy,
> iter->async_tx.phys,
iop_desc_get_next_desc(iter),
> - iter->async_tx.ack);
> + async_tx_test_ack(&iter->async_tx));
> prefetch(_iter);
> prefetch(&_iter->async_tx);
>
> @@ -338,9 +338,7 @@ retry:
>
> /* pre-ack all but the last descriptor
*/
> if (num_slots != slots_per_op)
> - iter->async_tx.ack = 1;
> - else
> - iter->async_tx.ack = 0;
> + async_tx_ack(&iter->async_tx);
>
> list_add_tail(&iter->chain_node,
&chain);
> alloc_tail = iter;
> @@ -513,7 +511,7 @@ static int iop_adma_alloc_chan_resources(struct
dma_chan
> *chan) }
>
> static struct dma_async_tx_descriptor *
> -iop_adma_prep_dma_interrupt(struct dma_chan *chan)
> +iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long
flags)
> {
> struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
> struct iop_adma_desc_slot *sw_desc, *grp_start;
> @@ -528,6 +526,7 @@ iop_adma_prep_dma_interrupt(struct dma_chan *chan)
> grp_start = sw_desc->group_head;
> iop_desc_init_interrupt(grp_start, iop_chan);
> grp_start->unmap_len = 0;
> + sw_desc->async_tx.flags = flags;
> }
> spin_unlock_bh(&iop_chan->lock);
>
> @@ -560,6 +559,7 @@ iop_adma_prep_dma_memcpy(struct dma_chan *chan,
> dma_addr_t dma_dest,
iop_desc_set_memcpy_src_addr(grp_start, dma_src);
> sw_desc->unmap_src_cnt = 1;
> sw_desc->unmap_len = len;
> + sw_desc->async_tx.flags = flags;
> }
> spin_unlock_bh(&iop_chan->lock);
>
> @@ -592,6 +592,7 @@ iop_adma_prep_dma_memset(struct dma_chan *chan,
> dma_addr_t dma_dest, iop_desc_set_dest_addr(grp_start,
iop_chan, dma_dest);
> sw_desc->unmap_src_cnt = 1;
> sw_desc->unmap_len = len;
> + sw_desc->async_tx.flags = flags;
> }
> spin_unlock_bh(&iop_chan->lock);
>
> @@ -625,6 +626,7 @@ iop_adma_prep_dma_xor(struct dma_chan *chan,
dma_addr_t
> dma_dest, iop_desc_set_dest_addr(grp_start, iop_chan,
dma_dest);
> sw_desc->unmap_src_cnt = src_cnt;
> sw_desc->unmap_len = len;
> + sw_desc->async_tx.flags = flags;
> while (src_cnt--)
> iop_desc_set_xor_src_addr(grp_start, src_cnt,
> dma_src[src_cnt]);
> @@ -661,6 +663,7 @@ iop_adma_prep_dma_zero_sum(struct dma_chan *chan,
> dma_addr_t *dma_src, __func__,
grp_start->xor_check_result);
> sw_desc->unmap_src_cnt = src_cnt;
> sw_desc->unmap_len = len;
> + sw_desc->async_tx.flags = flags;
> while (src_cnt--)
> iop_desc_set_zero_sum_src_addr(grp_start,
src_cnt,
>
dma_src[src_cnt]);
> @@ -847,11 +850,11 @@ static int __devinit
iop_adma_memcpy_self_test(struct
> iop_adma_device *device) src_dma =
dma_map_single(dma_chan->device->dev,
> src, IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE);
> tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma,
> - IOP_ADMA_TEST_SIZE, 1);
> + IOP_ADMA_TEST_SIZE,
> + DMA_PREP_INTERRUPT |
DMA_CTRL_ACK);
>
> cookie = iop_adma_tx_submit(tx);
> iop_adma_issue_pending(dma_chan);
> - async_tx_ack(tx);
> msleep(1);
>
> if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
> @@ -947,11 +950,11 @@ iop_adma_xor_zero_sum_self_test(struct
iop_adma_device
> *device) dma_srcs[i] =
dma_map_page(dma_chan->device->dev, xor_srcs[i],
> 0, PAGE_SIZE, DMA_TO_DEVICE);
> tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
> - IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE, 1);
> + IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE,
> + DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
>
> cookie = iop_adma_tx_submit(tx);
> iop_adma_issue_pending(dma_chan);
> - async_tx_ack(tx);
> msleep(8);
>
> if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
> @@ -994,11 +997,11 @@ iop_adma_xor_zero_sum_self_test(struct
iop_adma_device
> *device) DMA_TO_DEVICE);
> tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs,
> IOP_ADMA_NUM_SRC_TEST + 1,
PAGE_SIZE,
> - &zero_sum_result, 1);
> + &zero_sum_result,
> + DMA_PREP_INTERRUPT |
DMA_CTRL_ACK);
>
> cookie = iop_adma_tx_submit(tx);
> iop_adma_issue_pending(dma_chan);
> - async_tx_ack(tx);
> msleep(8);
>
> if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
DMA_SUCCESS) {
> @@ -1018,11 +1021,11 @@ iop_adma_xor_zero_sum_self_test(struct
> iop_adma_device *device) /* test memset */
> dma_addr = dma_map_page(dma_chan->device->dev, dest, 0,
> PAGE_SIZE, DMA_FROM_DEVICE);
> - tx = iop_adma_prep_dma_memset(dma_chan, dma_addr, 0, PAGE_SIZE,
1);
> + tx = iop_adma_prep_dma_memset(dma_chan, dma_addr, 0, PAGE_SIZE,
> + DMA_PREP_INTERRUPT |
DMA_CTRL_ACK);
>
> cookie = iop_adma_tx_submit(tx);
> iop_adma_issue_pending(dma_chan);
> - async_tx_ack(tx);
> msleep(8);
>
> if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
DMA_SUCCESS) {
> @@ -1050,11 +1053,11 @@ iop_adma_xor_zero_sum_self_test(struct
> iop_adma_device *device)
DMA_TO_DEVICE);
> tx = iop_adma_prep_dma_zero_sum(dma_chan, dma_srcs,
> IOP_ADMA_NUM_SRC_TEST + 1,
PAGE_SIZE,
> - &zero_sum_result, 1);
> + &zero_sum_result,
> + DMA_PREP_INTERRUPT |
DMA_CTRL_ACK);
>
> cookie = iop_adma_tx_submit(tx);
> iop_adma_issue_pending(dma_chan);
> - async_tx_ack(tx);
> msleep(8);
>
> if (iop_adma_is_complete(dma_chan, cookie, NULL, NULL) !=
DMA_SUCCESS) {
> @@ -1287,7 +1290,7 @@ static void iop_chan_start_null_memcpy(struct
> iop_adma_chan *iop_chan) grp_start =
sw_desc->group_head;
>
> list_splice_init(&sw_desc->async_tx.tx_list,
&iop_chan->chain);
> - sw_desc->async_tx.ack = 1;
> + async_tx_ack(&sw_desc->async_tx);
> iop_desc_init_memcpy(grp_start, 0);
> iop_desc_set_byte_count(grp_start, iop_chan, 0);
> iop_desc_set_dest_addr(grp_start, iop_chan, 0);
> @@ -1343,7 +1346,7 @@ static void iop_chan_start_null_xor(struct
> iop_adma_chan *iop_chan) if (sw_desc) {
> grp_start = sw_desc->group_head;
> list_splice_init(&sw_desc->async_tx.tx_list,
&iop_chan->chain);
> - sw_desc->async_tx.ack = 1;
> + async_tx_ack(&sw_desc->async_tx);
> iop_desc_init_null_xor(grp_start, 2, 0);
> iop_desc_set_byte_count(grp_start, iop_chan, 0);
> iop_desc_set_dest_addr(grp_start, iop_chan, 0);
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index 4e413c7..11c9da1 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -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))
Acked-by: Maciej Sosnowski <maciej.sosnowski@xxxxxxxxx>
---------------------------------------------------------------------
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