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authorLinus Torvalds <torvalds@linux-foundation.org>2010-03-04 08:20:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-04 08:20:14 -0800
commit9bb676966aa85e56af00b353387d3c274a26e480 (patch)
treecafc9a409aa05cc9060eb53f03c35881f41b6cec /drivers/dma/ioat/dma_v2.c
parent0f2cc4ecd81dc1917a041dc93db0ada28f8356fa (diff)
parentdd58ffcf5a5352fc10820c8ffbcd5fed416a2c3a (diff)
Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx
* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (28 commits) ioat: cleanup ->timer_fn() and ->cleanup_fn() prototypes ioat3: interrupt coalescing ioat: close potential BUG_ON race in the descriptor cleanup path ioat2: kill pending flag ioat3: use ioat2_quiesce() ioat3: cleanup, don't enable DCA completion writes DMAENGINE: COH 901 318 lli sg offset fix DMAENGINE: COH 901 318 configure channel direction DMAENGINE: COH 901 318 remove irq counting DMAENGINE: COH 901 318 descriptor pool refactoring DMAENGINE: COH 901 318 cleanups dma: Add MPC512x DMA driver Debugging options for the DMA engine subsystem iop-adma: redundant/wrong tests in iop_*_count()? dmatest: fix handling of an even number of xor_sources dmatest: correct raid6 PQ test fsldma: Fix cookie issues fsldma: Fix cookie issues dma: cases IPU_PIX_FMT_BGRA32, BGR32 and ABGR32 are the same in ipu_ch_param_set_size() dma: make Open Firmware device id constant ...
Diffstat (limited to 'drivers/dma/ioat/dma_v2.c')
-rw-r--r--drivers/dma/ioat/dma_v2.c70
1 files changed, 21 insertions, 49 deletions
diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c
index 5cc37afe2bc..1ed5d66d7dc 100644
--- a/drivers/dma/ioat/dma_v2.c
+++ b/drivers/dma/ioat/dma_v2.c
@@ -51,48 +51,40 @@ MODULE_PARM_DESC(ioat_ring_max_alloc_order,
void __ioat2_issue_pending(struct ioat2_dma_chan *ioat)
{
- void * __iomem reg_base = ioat->base.reg_base;
+ struct ioat_chan_common *chan = &ioat->base;
- ioat->pending = 0;
ioat->dmacount += ioat2_ring_pending(ioat);
ioat->issued = ioat->head;
/* make descriptor updates globally visible before notifying channel */
wmb();
- writew(ioat->dmacount, reg_base + IOAT_CHAN_DMACOUNT_OFFSET);
- dev_dbg(to_dev(&ioat->base),
+ writew(ioat->dmacount, chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET);
+ dev_dbg(to_dev(chan),
"%s: head: %#x tail: %#x issued: %#x count: %#x\n",
__func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount);
}
-void ioat2_issue_pending(struct dma_chan *chan)
+void ioat2_issue_pending(struct dma_chan *c)
{
- struct ioat2_dma_chan *ioat = to_ioat2_chan(chan);
+ struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
- spin_lock_bh(&ioat->ring_lock);
- if (ioat->pending == 1)
+ if (ioat2_ring_pending(ioat)) {
+ spin_lock_bh(&ioat->ring_lock);
__ioat2_issue_pending(ioat);
- spin_unlock_bh(&ioat->ring_lock);
+ spin_unlock_bh(&ioat->ring_lock);
+ }
}
/**
* ioat2_update_pending - log pending descriptors
* @ioat: ioat2+ channel
*
- * set pending to '1' unless pending is already set to '2', pending == 2
- * indicates that submission is temporarily blocked due to an in-flight
- * reset. If we are already above the ioat_pending_level threshold then
- * just issue pending.
- *
- * called with ring_lock held
+ * Check if the number of unsubmitted descriptors has exceeded the
+ * watermark. Called with ring_lock held
*/
static void ioat2_update_pending(struct ioat2_dma_chan *ioat)
{
- if (unlikely(ioat->pending == 2))
- return;
- else if (ioat2_ring_pending(ioat) > ioat_pending_level)
+ if (ioat2_ring_pending(ioat) > ioat_pending_level)
__ioat2_issue_pending(ioat);
- else
- ioat->pending = 1;
}
static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat)
@@ -166,7 +158,7 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete)
seen_current = true;
}
ioat->tail += i;
- BUG_ON(!seen_current); /* no active descs have written a completion? */
+ BUG_ON(active && !seen_current); /* no active descs have written a completion? */
chan->last_completion = phys_complete;
if (ioat->head == ioat->tail) {
@@ -207,9 +199,9 @@ static void ioat2_cleanup(struct ioat2_dma_chan *ioat)
spin_unlock_bh(&chan->cleanup_lock);
}
-void ioat2_cleanup_tasklet(unsigned long data)
+void ioat2_cleanup_event(unsigned long data)
{
- struct ioat2_dma_chan *ioat = (void *) data;
+ struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data);
ioat2_cleanup(ioat);
writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET);
@@ -291,7 +283,7 @@ static void ioat2_restart_channel(struct ioat2_dma_chan *ioat)
void ioat2_timer_event(unsigned long data)
{
- struct ioat2_dma_chan *ioat = (void *) data;
+ struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data);
struct ioat_chan_common *chan = &ioat->base;
spin_lock_bh(&chan->cleanup_lock);
@@ -397,10 +389,7 @@ int ioat2_enumerate_channels(struct ioatdma_device *device)
if (!ioat)
break;
- ioat_init_channel(device, &ioat->base, i,
- device->timer_fn,
- device->cleanup_tasklet,
- (unsigned long) ioat);
+ ioat_init_channel(device, &ioat->base, i);
ioat->xfercap_log = xfercap_log;
spin_lock_init(&ioat->ring_lock);
if (device->reset_hw(&ioat->base)) {
@@ -546,7 +535,6 @@ int ioat2_alloc_chan_resources(struct dma_chan *c)
ioat->head = 0;
ioat->issued = 0;
ioat->tail = 0;
- ioat->pending = 0;
ioat->alloc_order = order;
spin_unlock_bh(&ioat->ring_lock);
@@ -701,7 +689,7 @@ int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs)
mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT);
spin_unlock_bh(&chan->cleanup_lock);
- device->timer_fn((unsigned long) ioat);
+ device->timer_fn((unsigned long) &chan->common);
} else
spin_unlock_bh(&chan->cleanup_lock);
return -ENOMEM;
@@ -785,7 +773,7 @@ void ioat2_free_chan_resources(struct dma_chan *c)
tasklet_disable(&chan->cleanup_task);
del_timer_sync(&chan->timer);
- device->cleanup_tasklet((unsigned long) ioat);
+ device->cleanup_fn((unsigned long) c);
device->reset_hw(chan);
spin_lock_bh(&ioat->ring_lock);
@@ -815,25 +803,9 @@ void ioat2_free_chan_resources(struct dma_chan *c)
chan->last_completion = 0;
chan->completion_dma = 0;
- ioat->pending = 0;
ioat->dmacount = 0;
}
-enum dma_status
-ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie,
- dma_cookie_t *done, dma_cookie_t *used)
-{
- struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
- struct ioatdma_device *device = ioat->base.device;
-
- if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS)
- return DMA_SUCCESS;
-
- device->cleanup_tasklet((unsigned long) ioat);
-
- return ioat_is_complete(c, cookie, done, used);
-}
-
static ssize_t ring_size_show(struct dma_chan *c, char *page)
{
struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
@@ -874,7 +846,7 @@ int __devinit ioat2_dma_probe(struct ioatdma_device *device, int dca)
device->enumerate_channels = ioat2_enumerate_channels;
device->reset_hw = ioat2_reset_hw;
- device->cleanup_tasklet = ioat2_cleanup_tasklet;
+ device->cleanup_fn = ioat2_cleanup_event;
device->timer_fn = ioat2_timer_event;
device->self_test = ioat_dma_self_test;
dma = &device->common;
@@ -882,7 +854,7 @@ int __devinit ioat2_dma_probe(struct ioatdma_device *device, int dca)
dma->device_issue_pending = ioat2_issue_pending;
dma->device_alloc_chan_resources = ioat2_alloc_chan_resources;
dma->device_free_chan_resources = ioat2_free_chan_resources;
- dma->device_is_tx_complete = ioat2_is_complete;
+ dma->device_is_tx_complete = ioat_is_dma_complete;
err = ioat_probe(device);
if (err)