[git pull] async-tx update for 2.6.26

From: Dan Williams
Date: Thu Apr 17 2008 - 17:29:28 EST

Linus, please pull from:

master.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx.git next

to receive:

Dan Williams (4):
async_tx: fix multiple dependency submission
async_tx: kill ->device_dependency_added
iop-adma: remove the workaround for missed interrupts on iop3xx
dmaengine: ack to flags: make use of the unused bits in the 'ack' field

Zhang Wei (2):
fsldma: Remove CONFIG_FSL_DMA_SELFTEST, keep fsl_dma_self_test() running always.
fsldma: Split the MPC83xx event from MPC85xx and refine irq codes.

crypto/async_tx/async_memcpy.c | 2 +-
crypto/async_tx/async_tx.c | 202 ++++++++++++++++++++++++++------
crypto/async_tx/async_xor.c | 2 +-
drivers/dma/Kconfig | 8 --
drivers/dma/dmaengine.c | 15 +--
drivers/dma/fsldma.c | 57 +++++-----
drivers/dma/ioat_dma.c | 36 ++----
drivers/dma/iop-adma.c | 60 ++++------
include/asm-arm/arch-iop13xx/adma.h | 5 -
include/asm-arm/hardware/iop3xx-adma.h | 8 --
include/asm-arm/hardware/iop_adma.h | 2 -
include/linux/dmaengine.h | 36 ++++---
12 files changed, 261 insertions(+), 172 deletions(-)

These have been in -next and -mm for about 5 weeks. The primary change
is fixing a thinko in the core dependency submission code. It was being
hidden by a workaround in iop-adma, currently the only in-tree user.
The rest are general cleanups.

Regards,
Dan

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 2be3bae..c6e772f 100644
--- a/crypto/async_tx/async_tx.c
+++ b/crypto/async_tx/async_tx.c
@@ -89,13 +89,19 @@ dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx)
iter = tx;

/* find the root of the unsubmitted dependency chain */
- while (iter->cookie == -EBUSY) {
+ do {
parent = iter->parent;
- if (parent && parent->cookie == -EBUSY)
- iter = iter->parent;
- else
+ if (!parent)
break;
- }
+ else
+ iter = parent;
+ } while (parent);
+
+ /* there is a small window for ->parent == NULL and
+ * ->cookie == -EBUSY
+ */
+ while (iter->cookie == -EBUSY)
+ cpu_relax();

status = dma_sync_wait(iter->chan, iter->cookie);
} while (status == DMA_IN_PROGRESS || (iter != tx));
@@ -111,24 +117,33 @@ EXPORT_SYMBOL_GPL(dma_wait_for_async_tx);
void
async_tx_run_dependencies(struct dma_async_tx_descriptor *tx)
{
- struct dma_async_tx_descriptor *dep_tx, *_dep_tx;
- struct dma_device *dev;
+ struct dma_async_tx_descriptor *next = tx->next;
struct dma_chan *chan;

- list_for_each_entry_safe(dep_tx, _dep_tx, &tx->depend_list,
- depend_node) {
- chan = dep_tx->chan;
- dev = chan->device;
- /* we can't depend on ourselves */
- BUG_ON(chan == tx->chan);
- list_del(&dep_tx->depend_node);
- tx->tx_submit(dep_tx);
-
- /* we need to poke the engine as client code does not
- * know about dependency submission events
- */
- dev->device_issue_pending(chan);
+ if (!next)
+ return;
+
+ tx->next = NULL;
+ chan = next->chan;
+
+ /* keep submitting up until a channel switch is detected
+ * in that case we will be called again as a result of
+ * processing the interrupt from async_tx_channel_switch
+ */
+ while (next && next->chan == chan) {
+ struct dma_async_tx_descriptor *_next;
+
+ spin_lock_bh(&next->lock);
+ next->parent = NULL;
+ _next = next->next;
+ next->next = NULL;
+ spin_unlock_bh(&next->lock);
+
+ next->tx_submit(next);
+ next = _next;
}
+
+ chan->device->device_issue_pending(chan);
}
EXPORT_SYMBOL_GPL(async_tx_run_dependencies);

@@ -397,6 +412,92 @@ static void __exit async_tx_exit(void)
}
#endif

+
+/**
+ * async_tx_channel_switch - queue an interrupt descriptor with a dependency
+ * pre-attached.
+ * @depend_tx: the operation that must finish before the new operation runs
+ * @tx: the new operation
+ */
+static void
+async_tx_channel_switch(struct dma_async_tx_descriptor *depend_tx,
+ struct dma_async_tx_descriptor *tx)
+{
+ struct dma_chan *chan;
+ struct dma_device *device;
+ struct dma_async_tx_descriptor *intr_tx = (void *) ~0;
+
+ /* first check to see if we can still append to depend_tx */
+ spin_lock_bh(&depend_tx->lock);
+ if (depend_tx->parent && depend_tx->chan == tx->chan) {
+ tx->parent = depend_tx;
+ depend_tx->next = tx;
+ intr_tx = NULL;
+ }
+ spin_unlock_bh(&depend_tx->lock);
+
+ if (!intr_tx)
+ return;
+
+ chan = depend_tx->chan;
+ device = chan->device;
+
+ /* see if we can schedule an interrupt
+ * otherwise poll for completion
+ */
+ if (dma_has_cap(DMA_INTERRUPT, device->cap_mask))
+ intr_tx = device->device_prep_dma_interrupt(chan, 0);
+ else
+ intr_tx = NULL;
+
+ if (intr_tx) {
+ intr_tx->callback = NULL;
+ intr_tx->callback_param = NULL;
+ tx->parent = intr_tx;
+ /* safe to set ->next outside the lock since we know we are
+ * not submitted yet
+ */
+ intr_tx->next = tx;
+
+ /* check if we need to append */
+ spin_lock_bh(&depend_tx->lock);
+ if (depend_tx->parent) {
+ intr_tx->parent = depend_tx;
+ depend_tx->next = intr_tx;
+ async_tx_ack(intr_tx);
+ intr_tx = NULL;
+ }
+ spin_unlock_bh(&depend_tx->lock);
+
+ if (intr_tx) {
+ intr_tx->parent = NULL;
+ intr_tx->tx_submit(intr_tx);
+ async_tx_ack(intr_tx);
+ }
+ } else {
+ if (dma_wait_for_async_tx(depend_tx) == DMA_ERROR)
+ panic("%s: DMA_ERROR waiting for depend_tx\n",
+ __func__);
+ tx->tx_submit(tx);
+ }
+}
+
+
+/**
+ * submit_disposition - while holding depend_tx->lock we must avoid submitting
+ * new operations to prevent a circular locking dependency with
+ * drivers that already hold a channel lock when calling
+ * async_tx_run_dependencies.
+ * @ASYNC_TX_SUBMITTED: we were able to append the new operation under the lock
+ * @ASYNC_TX_CHANNEL_SWITCH: when the lock is dropped schedule a channel switch
+ * @ASYNC_TX_DIRECT_SUBMIT: when the lock is dropped submit directly
+ */
+enum submit_disposition {
+ ASYNC_TX_SUBMITTED,
+ ASYNC_TX_CHANNEL_SWITCH,
+ ASYNC_TX_DIRECT_SUBMIT,
+};
+
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,
@@ -405,28 +506,55 @@ async_tx_submit(struct dma_chan *chan, struct dma_async_tx_descriptor *tx,
tx->callback = cb_fn;
tx->callback_param = cb_param;

- /* set this new tx to run after depend_tx if:
- * 1/ a dependency exists (depend_tx is !NULL)
- * 2/ the tx can not be submitted to the current channel
- */
- if (depend_tx && depend_tx->chan != chan) {
- /* if ack is already set then we cannot be sure
+ if (depend_tx) {
+ enum submit_disposition s;
+
+ /* sanity check the dependency chain:
+ * 1/ if ack is already set then we cannot be sure
* we are referring to the correct operation
+ * 2/ dependencies are 1:1 i.e. two transactions can
+ * not depend on the same parent
*/
- BUG_ON(depend_tx->ack);
+ BUG_ON(async_tx_test_ack(depend_tx) || depend_tx->next ||
+ tx->parent);

- tx->parent = depend_tx;
+ /* the lock prevents async_tx_run_dependencies from missing
+ * the setting of ->next when ->parent != NULL
+ */
spin_lock_bh(&depend_tx->lock);
- list_add_tail(&tx->depend_node, &depend_tx->depend_list);
- if (depend_tx->cookie == 0) {
- struct dma_chan *dep_chan = depend_tx->chan;
- struct dma_device *dep_dev = dep_chan->device;
- dep_dev->device_dependency_added(dep_chan);
+ if (depend_tx->parent) {
+ /* we have a parent so we can not submit directly
+ * if we are staying on the same channel: append
+ * else: channel switch
+ */
+ if (depend_tx->chan == chan) {
+ tx->parent = depend_tx;
+ depend_tx->next = tx;
+ s = ASYNC_TX_SUBMITTED;
+ } else
+ s = ASYNC_TX_CHANNEL_SWITCH;
+ } else {
+ /* we do not have a parent so we may be able to submit
+ * directly if we are staying on the same channel
+ */
+ if (depend_tx->chan == chan)
+ s = ASYNC_TX_DIRECT_SUBMIT;
+ else
+ s = ASYNC_TX_CHANNEL_SWITCH;
}
spin_unlock_bh(&depend_tx->lock);

- /* schedule an interrupt to trigger the channel switch */
- async_trigger_callback(ASYNC_TX_ACK, depend_tx, NULL, NULL);
+ switch (s) {
+ case ASYNC_TX_SUBMITTED:
+ break;
+ case ASYNC_TX_CHANNEL_SWITCH:
+ async_tx_channel_switch(depend_tx, tx);
+ break;
+ case ASYNC_TX_DIRECT_SUBMIT:
+ tx->parent = NULL;
+ tx->tx_submit(tx);
+ break;
+ }
} else {
tx->parent = NULL;
tx->tx_submit(tx);
@@ -467,7 +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;

@@ -483,7 +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 1c445c7..3a0dddc 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/Kconfig b/drivers/dma/Kconfig
index 27340a7..6239c3d 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -46,14 +46,6 @@ config FSL_DMA
MPC8560/40, MPC8555, MPC8548 and MPC8641 processors.
The MPC8349, MPC8360 is also supported.

-config FSL_DMA_SELFTEST
- bool "Enable the self test for each DMA channel"
- depends on FSL_DMA
- default y
- ---help---
- Enable the self test for each DMA channel. A self test will be
- performed after the channel probed to ensure the DMA works well.
-
config DMA_ENGINE
bool

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 8db0e7f..d6dc70f 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -362,7 +362,6 @@ int dma_async_device_register(struct dma_device *device)

BUG_ON(!device->device_alloc_chan_resources);
BUG_ON(!device->device_free_chan_resources);
- BUG_ON(!device->device_dependency_added);
BUG_ON(!device->device_is_tx_complete);
BUG_ON(!device->device_issue_pending);
BUG_ON(!device->dev);
@@ -479,7 +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);
@@ -487,7 +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);

@@ -525,7 +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);
@@ -533,7 +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);

@@ -574,7 +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);
@@ -582,7 +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);

@@ -600,8 +599,6 @@ void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
{
tx->chan = chan;
spin_lock_init(&tx->lock);
- INIT_LIST_HEAD(&tx->depend_node);
- INIT_LIST_HEAD(&tx->depend_list);
}
EXPORT_SYMBOL(dma_async_tx_descriptor_init);

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index df16368..054eabf 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -412,7 +412,7 @@ 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;
@@ -429,7 +429,7 @@ fsl_dma_prep_interrupt(struct dma_chan *chan)
}

new->async_tx.cookie = -EBUSY;
- new->async_tx.ack = 0;
+ new->async_tx.flags = flags;

/* Insert the link descriptor to the LD ring */
list_add_tail(&new->node, &new->async_tx.tx_list);
@@ -482,7 +482,7 @@ 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;
@@ -493,7 +493,7 @@ 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*/
@@ -658,13 +658,6 @@ static void fsl_dma_memcpy_issue_pending(struct dma_chan *chan)
fsl_chan_xfer_ld_queue(fsl_chan);
}

-static void fsl_dma_dependency_added(struct dma_chan *chan)
-{
- struct fsl_dma_chan *fsl_chan = to_fsl_chan(chan);
-
- fsl_chan_ld_cleanup(fsl_chan);
-}
-
/**
* fsl_dma_is_complete - Determine the DMA status
* @fsl_chan : Freescale DMA channel
@@ -696,6 +689,8 @@ static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data)
{
struct fsl_dma_chan *fsl_chan = (struct fsl_dma_chan *)data;
u32 stat;
+ int update_cookie = 0;
+ int xfer_ld_q = 0;

stat = get_sr(fsl_chan);
dev_dbg(fsl_chan->dev, "event: channel %d, stat = 0x%x\n",
@@ -720,8 +715,8 @@ static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data)
* Now, update the completed cookie, and continue the
* next uncompleted transfer.
*/
- fsl_dma_update_completed_cookie(fsl_chan);
- fsl_chan_xfer_ld_queue(fsl_chan);
+ update_cookie = 1;
+ xfer_ld_q = 1;
}
stat &= ~FSL_DMA_SR_PE;
}
@@ -734,19 +729,33 @@ static irqreturn_t fsl_dma_chan_do_interrupt(int irq, void *data)
dev_dbg(fsl_chan->dev, "event: clndar %p, nlndar %p\n",
(void *)get_cdar(fsl_chan), (void *)get_ndar(fsl_chan));
stat &= ~FSL_DMA_SR_EOSI;
- fsl_dma_update_completed_cookie(fsl_chan);
+ update_cookie = 1;
+ }
+
+ /* For MPC8349, EOCDI event need to update cookie
+ * and start the next transfer if it exist.
+ */
+ if (stat & FSL_DMA_SR_EOCDI) {
+ dev_dbg(fsl_chan->dev, "event: End-of-Chain link INT\n");
+ stat &= ~FSL_DMA_SR_EOCDI;
+ update_cookie = 1;
+ xfer_ld_q = 1;
}

/* If it current transfer is the end-of-transfer,
* we should clear the Channel Start bit for
* prepare next transfer.
*/
- if (stat & (FSL_DMA_SR_EOLNI | FSL_DMA_SR_EOCDI)) {
+ if (stat & FSL_DMA_SR_EOLNI) {
dev_dbg(fsl_chan->dev, "event: End-of-link INT\n");
stat &= ~FSL_DMA_SR_EOLNI;
- fsl_chan_xfer_ld_queue(fsl_chan);
+ xfer_ld_q = 1;
}

+ if (update_cookie)
+ fsl_dma_update_completed_cookie(fsl_chan);
+ if (xfer_ld_q)
+ fsl_chan_xfer_ld_queue(fsl_chan);
if (stat)
dev_dbg(fsl_chan->dev, "event: unhandled sr 0x%02x\n",
stat);
@@ -776,15 +785,13 @@ static void dma_do_tasklet(unsigned long data)
fsl_chan_ld_cleanup(fsl_chan);
}

-#ifdef FSL_DMA_CALLBACKTEST
-static void fsl_dma_callback_test(struct fsl_dma_chan *fsl_chan)
+static void fsl_dma_callback_test(void *param)
{
+ struct fsl_dma_chan *fsl_chan = param;
if (fsl_chan)
- dev_info(fsl_chan->dev, "selftest: callback is ok!\n");
+ dev_dbg(fsl_chan->dev, "selftest: callback is ok!\n");
}
-#endif

-#ifdef CONFIG_FSL_DMA_SELFTEST
static int fsl_dma_self_test(struct fsl_dma_chan *fsl_chan)
{
struct dma_chan *chan;
@@ -867,7 +874,7 @@ static int fsl_dma_self_test(struct fsl_dma_chan *fsl_chan)
async_tx_ack(tx3);

/* Interrupt tx test */
- tx1 = fsl_dma_prep_interrupt(chan);
+ tx1 = fsl_dma_prep_interrupt(chan, 0);
async_tx_ack(tx1);
cookie = fsl_dma_tx_submit(tx1);

@@ -875,13 +882,11 @@ static int fsl_dma_self_test(struct fsl_dma_chan *fsl_chan)
cookie = fsl_dma_tx_submit(tx3);
cookie = fsl_dma_tx_submit(tx2);

-#ifdef FSL_DMA_CALLBACKTEST
if (dma_has_cap(DMA_INTERRUPT, ((struct fsl_dma_device *)
dev_get_drvdata(fsl_chan->dev->parent))->common.cap_mask)) {
tx3->callback = fsl_dma_callback_test;
tx3->callback_param = fsl_chan;
}
-#endif
fsl_dma_memcpy_issue_pending(chan);
msleep(2);

@@ -906,7 +911,6 @@ out:
kfree(src);
return err;
}
-#endif

static int __devinit of_fsl_dma_chan_probe(struct of_device *dev,
const struct of_device_id *match)
@@ -997,11 +1001,9 @@ static int __devinit of_fsl_dma_chan_probe(struct of_device *dev,
}
}

-#ifdef CONFIG_FSL_DMA_SELFTEST
err = fsl_dma_self_test(new_fsl_chan);
if (err)
goto err;
-#endif

dev_info(&dev->dev, "#%d (%s), irq %d\n", new_fsl_chan->id,
match->compatible, new_fsl_chan->irq);
@@ -1080,7 +1082,6 @@ static int __devinit of_fsl_dma_probe(struct of_device *dev,
fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy;
fdev->common.device_is_tx_complete = fsl_dma_is_complete;
fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending;
- fdev->common.device_dependency_added = fsl_dma_dependency_added;
fdev->common.dev = &dev->dev;

irq = irq_of_parse_and_map(dev->node, 0);
diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index 4017d9e..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);
@@ -924,17 +924,6 @@ static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan)
spin_unlock_bh(&ioat_chan->cleanup_lock);
}

-static void ioat_dma_dependency_added(struct dma_chan *chan)
-{
- struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
- spin_lock_bh(&ioat_chan->desc_lock);
- if (ioat_chan->pending == 0) {
- spin_unlock_bh(&ioat_chan->desc_lock);
- ioat_dma_memcpy_cleanup(ioat_chan);
- } else
- spin_unlock_bh(&ioat_chan->desc_lock);
-}
-
/**
* ioat_dma_is_complete - poll the status of a IOAT DMA transaction
* @chan: IOAT DMA channel handle
@@ -990,7 +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;
@@ -1316,7 +1305,6 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,

dma_cap_set(DMA_MEMCPY, device->common.cap_mask);
device->common.device_is_tx_complete = ioat_dma_is_complete;
- device->common.device_dependency_added = ioat_dma_dependency_added;
switch (device->version) {
case IOAT_VER_1_2:
device->common.device_prep_dma_memcpy = ioat1_dma_prep_memcpy;
diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
index f82b090..762b729 100644
--- a/drivers/dma/iop-adma.c
+++ b/drivers/dma/iop-adma.c
@@ -63,7 +63,6 @@ iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,
struct iop_adma_chan *iop_chan, dma_cookie_t cookie)
{
BUG_ON(desc->async_tx.cookie < 0);
- spin_lock_bh(&desc->async_tx.lock);
if (desc->async_tx.cookie > 0) {
cookie = desc->async_tx.cookie;
desc->async_tx.cookie = 0;
@@ -101,7 +100,6 @@ iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc,

/* run dependent operations */
async_tx_run_dependencies(&desc->async_tx);
- spin_unlock_bh(&desc->async_tx.lock);

return cookie;
}
@@ -113,7 +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
@@ -150,7 +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);

@@ -257,8 +255,6 @@ static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)

BUG_ON(!seen_current);

- iop_chan_idle(busy, iop_chan);
-
if (cookie > 0) {
iop_chan->completed_cookie = cookie;
pr_debug("\tcompleted cookie %d\n", cookie);
@@ -275,8 +271,11 @@ iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)

static void iop_adma_tasklet(unsigned long data)
{
- struct iop_adma_chan *chan = (struct iop_adma_chan *) data;
- __iop_adma_slot_cleanup(chan);
+ struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data;
+
+ spin_lock(&iop_chan->lock);
+ __iop_adma_slot_cleanup(iop_chan);
+ spin_unlock(&iop_chan->lock);
}

static struct iop_adma_desc_slot *
@@ -339,9 +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;
@@ -514,7 +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;
@@ -529,6 +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);

@@ -561,6 +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);

@@ -593,6 +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);

@@ -626,6 +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]);
@@ -662,6 +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]);
@@ -671,12 +673,6 @@ iop_adma_prep_dma_zero_sum(struct dma_chan *chan, dma_addr_t *dma_src,
return sw_desc ? &sw_desc->async_tx : NULL;
}

-static void iop_adma_dependency_added(struct dma_chan *chan)
-{
- struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
- tasklet_schedule(&iop_chan->irq_tasklet);
-}
-
static void iop_adma_free_chan_resources(struct dma_chan *chan)
{
struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan);
@@ -854,11 +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) !=
@@ -954,11 +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) !=
@@ -1001,11 +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) {
@@ -1025,11 +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) {
@@ -1057,11 +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) {
@@ -1177,7 +1173,6 @@ static int __devinit iop_adma_probe(struct platform_device *pdev)
dma_dev->device_free_chan_resources = iop_adma_free_chan_resources;
dma_dev->device_is_tx_complete = iop_adma_is_complete;
dma_dev->device_issue_pending = iop_adma_issue_pending;
- dma_dev->device_dependency_added = iop_adma_dependency_added;
dma_dev->dev = &pdev->dev;

/* set prep routines based on capability */
@@ -1232,9 +1227,6 @@ static int __devinit iop_adma_probe(struct platform_device *pdev)
}

spin_lock_init(&iop_chan->lock);
- init_timer(&iop_chan->cleanup_watchdog);
- iop_chan->cleanup_watchdog.data = (unsigned long) iop_chan;
- iop_chan->cleanup_watchdog.function = iop_adma_tasklet;
INIT_LIST_HEAD(&iop_chan->chain);
INIT_LIST_HEAD(&iop_chan->all_slots);
INIT_RCU_HEAD(&iop_chan->common.rcu);
@@ -1298,7 +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);
@@ -1354,7 +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/asm-arm/arch-iop13xx/adma.h b/include/asm-arm/arch-iop13xx/adma.h
index efd9a5e..90d14ee 100644
--- a/include/asm-arm/arch-iop13xx/adma.h
+++ b/include/asm-arm/arch-iop13xx/adma.h
@@ -454,11 +454,6 @@ static inline void iop_chan_append(struct iop_adma_chan *chan)
__raw_writel(adma_accr, ADMA_ACCR(chan));
}

-static inline void iop_chan_idle(int busy, struct iop_adma_chan *chan)
-{
- do { } while (0);
-}
-
static inline u32 iop_chan_get_status(struct iop_adma_chan *chan)
{
return __raw_readl(ADMA_ACSR(chan));
diff --git a/include/asm-arm/hardware/iop3xx-adma.h b/include/asm-arm/hardware/iop3xx-adma.h
index 5c529e6..84d635b 100644
--- a/include/asm-arm/hardware/iop3xx-adma.h
+++ b/include/asm-arm/hardware/iop3xx-adma.h
@@ -767,20 +767,12 @@ static inline int iop_desc_get_zero_result(struct iop_adma_desc_slot *desc)
static inline void iop_chan_append(struct iop_adma_chan *chan)
{
u32 dma_chan_ctrl;
- /* workaround dropped interrupts on 3xx */
- mod_timer(&chan->cleanup_watchdog, jiffies + msecs_to_jiffies(3));

dma_chan_ctrl = __raw_readl(DMA_CCR(chan));
dma_chan_ctrl |= 0x2;
__raw_writel(dma_chan_ctrl, DMA_CCR(chan));
}

-static inline void iop_chan_idle(int busy, struct iop_adma_chan *chan)
-{
- if (!busy)
- del_timer(&chan->cleanup_watchdog);
-}
-
static inline u32 iop_chan_get_status(struct iop_adma_chan *chan)
{
return __raw_readl(DMA_CSR(chan));
diff --git a/include/asm-arm/hardware/iop_adma.h b/include/asm-arm/hardware/iop_adma.h
index ca8e71f..cb7e361 100644
--- a/include/asm-arm/hardware/iop_adma.h
+++ b/include/asm-arm/hardware/iop_adma.h
@@ -51,7 +51,6 @@ struct iop_adma_device {
* @common: common dmaengine channel object members
* @last_used: place holder for allocation to continue from where it left off
* @all_slots: complete domain of slots usable by the channel
- * @cleanup_watchdog: workaround missed interrupts on iop3xx
* @slots_allocated: records the actual size of the descriptor slot pool
* @irq_tasklet: bottom half where iop_adma_slot_cleanup runs
*/
@@ -65,7 +64,6 @@ struct iop_adma_chan {
struct dma_chan common;
struct iop_adma_desc_slot *last_used;
struct list_head all_slots;
- struct timer_list cleanup_watchdog;
int slots_allocated;
struct tasklet_struct irq_tasklet;
};
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 34d4406..b4d84ed 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
@@ -221,23 +226,20 @@ typedef void (*dma_async_tx_callback)(void *dma_async_param);
* @callback: routine to call after this operation is complete
* @callback_param: general parameter to pass to the callback routine
* ---async_tx api specific fields---
- * @depend_list: at completion this list of transactions are submitted
- * @depend_node: allow this transaction to be executed after another
- * transaction has completed, possibly on another channel
+ * @next: at completion submit this descriptor
* @parent: pointer to the next level up in the dependency chain
- * @lock: protect the dependency list
+ * @lock: protect the parent and next pointers
*/
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;
dma_cookie_t (*tx_submit)(struct dma_async_tx_descriptor *tx);
dma_async_tx_callback callback;
void *callback_param;
- struct list_head depend_list;
- struct list_head depend_node;
+ struct dma_async_tx_descriptor *next;
struct dma_async_tx_descriptor *parent;
spinlock_t lock;
};
@@ -261,7 +263,6 @@ struct dma_async_tx_descriptor {
* @device_prep_dma_zero_sum: prepares a zero_sum operation
* @device_prep_dma_memset: prepares a memset operation
* @device_prep_dma_interrupt: prepares an end of chain interrupt operation
- * @device_dependency_added: async_tx notifies the channel about new deps
* @device_issue_pending: push pending transactions to hardware
*/
struct dma_device {
@@ -294,9 +295,8 @@ 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);

- void (*device_dependency_added)(struct dma_chan *chan);
enum dma_status (*device_is_tx_complete)(struct dma_chan *chan,
dma_cookie_t cookie, dma_cookie_t *last,
dma_cookie_t *used);
@@ -321,7 +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))


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