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-rw-r--r--drivers/dma/ioat/dma.c48
-rw-r--r--drivers/dma/ioat/dma.h11
-rw-r--r--drivers/dma/ioat/dma_v2.c70
-rw-r--r--drivers/dma/ioat/dma_v2.h6
-rw-r--r--drivers/dma/ioat/dma_v3.c64
-rw-r--r--drivers/dma/ioat/registers.h2
6 files changed, 91 insertions, 110 deletions
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index dcc4ab78b32..af14c9a5b8d 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -71,7 +71,7 @@ static irqreturn_t ioat_dma_do_interrupt(int irq, void *data)
}
attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET);
- for_each_bit(bit, &attnstatus, BITS_PER_LONG) {
+ for_each_set_bit(bit, &attnstatus, BITS_PER_LONG) {
chan = ioat_chan_by_index(instance, bit);
tasklet_schedule(&chan->cleanup_task);
}
@@ -94,16 +94,12 @@ static irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data)
return IRQ_HANDLED;
}
-static void ioat1_cleanup_tasklet(unsigned long data);
-
/* common channel initialization */
-void ioat_init_channel(struct ioatdma_device *device,
- struct ioat_chan_common *chan, int idx,
- void (*timer_fn)(unsigned long),
- void (*tasklet)(unsigned long),
- unsigned long ioat)
+void ioat_init_channel(struct ioatdma_device *device, struct ioat_chan_common *chan, int idx)
{
struct dma_device *dma = &device->common;
+ struct dma_chan *c = &chan->common;
+ unsigned long data = (unsigned long) c;
chan->device = device;
chan->reg_base = device->reg_base + (0x80 * (idx + 1));
@@ -112,14 +108,12 @@ void ioat_init_channel(struct ioatdma_device *device,
list_add_tail(&chan->common.device_node, &dma->channels);
device->idx[idx] = chan;
init_timer(&chan->timer);
- chan->timer.function = timer_fn;
- chan->timer.data = ioat;
- tasklet_init(&chan->cleanup_task, tasklet, ioat);
+ chan->timer.function = device->timer_fn;
+ chan->timer.data = data;
+ tasklet_init(&chan->cleanup_task, device->cleanup_fn, data);
tasklet_disable(&chan->cleanup_task);
}
-static void ioat1_timer_event(unsigned long data);
-
/**
* ioat1_dma_enumerate_channels - find and initialize the device's channels
* @device: the device to be enumerated
@@ -155,10 +149,7 @@ static int ioat1_enumerate_channels(struct ioatdma_device *device)
if (!ioat)
break;
- ioat_init_channel(device, &ioat->base, i,
- ioat1_timer_event,
- ioat1_cleanup_tasklet,
- (unsigned long) ioat);
+ ioat_init_channel(device, &ioat->base, i);
ioat->xfercap = xfercap;
spin_lock_init(&ioat->desc_lock);
INIT_LIST_HEAD(&ioat->free_desc);
@@ -532,12 +523,12 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest,
return &desc->txd;
}
-static void ioat1_cleanup_tasklet(unsigned long data)
+static void ioat1_cleanup_event(unsigned long data)
{
- struct ioat_dma_chan *chan = (void *)data;
+ struct ioat_dma_chan *ioat = to_ioat_chan((void *) data);
- ioat1_cleanup(chan);
- writew(IOAT_CHANCTRL_RUN, chan->base.reg_base + IOAT_CHANCTRL_OFFSET);
+ ioat1_cleanup(ioat);
+ writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET);
}
void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags,
@@ -687,7 +678,7 @@ static void ioat1_cleanup(struct ioat_dma_chan *ioat)
static void ioat1_timer_event(unsigned long data)
{
- struct ioat_dma_chan *ioat = (void *) data;
+ struct ioat_dma_chan *ioat = to_ioat_chan((void *) data);
struct ioat_chan_common *chan = &ioat->base;
dev_dbg(to_dev(chan), "%s: state: %lx\n", __func__, chan->state);
@@ -734,16 +725,17 @@ static void ioat1_timer_event(unsigned long data)
spin_unlock_bh(&chan->cleanup_lock);
}
-static enum dma_status
-ioat1_dma_is_complete(struct dma_chan *c, dma_cookie_t cookie,
+enum dma_status
+ioat_is_dma_complete(struct dma_chan *c, dma_cookie_t cookie,
dma_cookie_t *done, dma_cookie_t *used)
{
- struct ioat_dma_chan *ioat = to_ioat_chan(c);
+ struct ioat_chan_common *chan = to_chan_common(c);
+ struct ioatdma_device *device = chan->device;
if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS)
return DMA_SUCCESS;
- ioat1_cleanup(ioat);
+ device->cleanup_fn((unsigned long) c);
return ioat_is_complete(c, cookie, done, used);
}
@@ -1199,12 +1191,14 @@ int __devinit ioat1_dma_probe(struct ioatdma_device *device, int dca)
device->intr_quirk = ioat1_intr_quirk;
device->enumerate_channels = ioat1_enumerate_channels;
device->self_test = ioat_dma_self_test;
+ device->timer_fn = ioat1_timer_event;
+ device->cleanup_fn = ioat1_cleanup_event;
dma = &device->common;
dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy;
dma->device_issue_pending = ioat1_dma_memcpy_issue_pending;
dma->device_alloc_chan_resources = ioat1_dma_alloc_chan_resources;
dma->device_free_chan_resources = ioat1_dma_free_chan_resources;
- dma->device_is_tx_complete = ioat1_dma_is_complete;
+ dma->device_is_tx_complete = ioat_is_dma_complete;
err = ioat_probe(device);
if (err)
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index bbc3e78ef33..4f747a25407 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -61,7 +61,7 @@
* @intr_quirk: interrupt setup quirk (for ioat_v1 devices)
* @enumerate_channels: hw version specific channel enumeration
* @reset_hw: hw version specific channel (re)initialization
- * @cleanup_tasklet: select between the v2 and v3 cleanup routines
+ * @cleanup_fn: select between the v2 and v3 cleanup routines
* @timer_fn: select between the v2 and v3 timer watchdog routines
* @self_test: hardware version specific self test for each supported op type
*
@@ -80,7 +80,7 @@ struct ioatdma_device {
void (*intr_quirk)(struct ioatdma_device *device);
int (*enumerate_channels)(struct ioatdma_device *device);
int (*reset_hw)(struct ioat_chan_common *chan);
- void (*cleanup_tasklet)(unsigned long data);
+ void (*cleanup_fn)(unsigned long data);
void (*timer_fn)(unsigned long data);
int (*self_test)(struct ioatdma_device *device);
};
@@ -337,10 +337,9 @@ struct dca_provider * __devinit ioat_dca_init(struct pci_dev *pdev,
void __iomem *iobase);
unsigned long ioat_get_current_completion(struct ioat_chan_common *chan);
void ioat_init_channel(struct ioatdma_device *device,
- struct ioat_chan_common *chan, int idx,
- void (*timer_fn)(unsigned long),
- void (*tasklet)(unsigned long),
- unsigned long ioat);
+ struct ioat_chan_common *chan, int idx);
+enum dma_status ioat_is_dma_complete(struct dma_chan *c, dma_cookie_t cookie,
+ dma_cookie_t *done, dma_cookie_t *used);
void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags,
size_t len, struct ioat_dma_descriptor *hw);
bool ioat_cleanup_preamble(struct ioat_chan_common *chan,
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)
diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h
index 3afad8da43c..ef2871fd786 100644
--- a/drivers/dma/ioat/dma_v2.h
+++ b/drivers/dma/ioat/dma_v2.h
@@ -47,7 +47,6 @@ extern int ioat_ring_alloc_order;
* @head: allocated index
* @issued: hardware notification point
* @tail: cleanup index
- * @pending: lock free indicator for issued != head
* @dmacount: identical to 'head' except for occasionally resetting to zero
* @alloc_order: log2 of the number of allocated descriptors
* @ring: software ring buffer implementation of hardware ring
@@ -61,7 +60,6 @@ struct ioat2_dma_chan {
u16 tail;
u16 dmacount;
u16 alloc_order;
- int pending;
struct ioat_ring_ent **ring;
spinlock_t ring_lock;
};
@@ -178,12 +176,10 @@ ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest,
void ioat2_issue_pending(struct dma_chan *chan);
int ioat2_alloc_chan_resources(struct dma_chan *c);
void ioat2_free_chan_resources(struct dma_chan *c);
-enum dma_status ioat2_is_complete(struct dma_chan *c, dma_cookie_t cookie,
- dma_cookie_t *done, dma_cookie_t *used);
void __ioat2_restart_chan(struct ioat2_dma_chan *ioat);
bool reshape_ring(struct ioat2_dma_chan *ioat, int order);
void __ioat2_issue_pending(struct ioat2_dma_chan *ioat);
-void ioat2_cleanup_tasklet(unsigned long data);
+void ioat2_cleanup_event(unsigned long data);
void ioat2_timer_event(unsigned long data);
int ioat2_quiesce(struct ioat_chan_common *chan, unsigned long tmo);
int ioat2_reset_sync(struct ioat_chan_common *chan, unsigned long tmo);
diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c
index 9908c9e94b2..26febc56dab 100644
--- a/drivers/dma/ioat/dma_v3.c
+++ b/drivers/dma/ioat/dma_v3.c
@@ -293,17 +293,25 @@ static void __cleanup(struct ioat2_dma_chan *ioat, unsigned long phys_complete)
}
}
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) {
+
+ active = ioat2_ring_active(ioat);
+ if (active == 0) {
dev_dbg(to_dev(chan), "%s: cancel completion timeout\n",
__func__);
clear_bit(IOAT_COMPLETION_PENDING, &chan->state);
mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT);
}
+ /* 5 microsecond delay per pending descriptor */
+ writew(min((5 * active), IOAT_INTRDELAY_MASK),
+ chan->device->reg_base + IOAT_INTRDELAY_OFFSET);
}
-static void ioat3_cleanup(struct ioat2_dma_chan *ioat)
+/* try to cleanup, but yield (via spin_trylock) to incoming submissions
+ * with the expectation that we will immediately poll again shortly
+ */
+static void ioat3_cleanup_poll(struct ioat2_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
unsigned long phys_complete;
@@ -329,29 +337,41 @@ static void ioat3_cleanup(struct ioat2_dma_chan *ioat)
spin_unlock_bh(&chan->cleanup_lock);
}
-static void ioat3_cleanup_tasklet(unsigned long data)
+/* run cleanup now because we already delayed the interrupt via INTRDELAY */
+static void ioat3_cleanup_sync(struct ioat2_dma_chan *ioat)
+{
+ struct ioat_chan_common *chan = &ioat->base;
+ unsigned long phys_complete;
+
+ prefetch(chan->completion);
+
+ spin_lock_bh(&chan->cleanup_lock);
+ if (!ioat_cleanup_preamble(chan, &phys_complete)) {
+ spin_unlock_bh(&chan->cleanup_lock);
+ return;
+ }
+ spin_lock_bh(&ioat->ring_lock);
+
+ __cleanup(ioat, phys_complete);
+
+ spin_unlock_bh(&ioat->ring_lock);
+ spin_unlock_bh(&chan->cleanup_lock);
+}
+
+static void ioat3_cleanup_event(unsigned long data)
{
- struct ioat2_dma_chan *ioat = (void *) data;
+ struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data);
- ioat3_cleanup(ioat);
- writew(IOAT_CHANCTRL_RUN | IOAT3_CHANCTRL_COMPL_DCA_EN,
- ioat->base.reg_base + IOAT_CHANCTRL_OFFSET);
+ ioat3_cleanup_sync(ioat);
+ writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET);
}
static void ioat3_restart_channel(struct ioat2_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
unsigned long phys_complete;
- u32 status;
-
- status = ioat_chansts(chan);
- if (is_ioat_active(status) || is_ioat_idle(status))
- ioat_suspend(chan);
- while (is_ioat_active(status) || is_ioat_idle(status)) {
- status = ioat_chansts(chan);
- cpu_relax();
- }
+ ioat2_quiesce(chan, 0);
if (ioat_cleanup_preamble(chan, &phys_complete))
__cleanup(ioat, phys_complete);
@@ -360,7 +380,7 @@ static void ioat3_restart_channel(struct ioat2_dma_chan *ioat)
static void ioat3_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);
@@ -426,7 +446,7 @@ ioat3_is_complete(struct dma_chan *c, dma_cookie_t cookie,
if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS)
return DMA_SUCCESS;
- ioat3_cleanup(ioat);
+ ioat3_cleanup_poll(ioat);
return ioat_is_complete(c, cookie, done, used);
}
@@ -1239,11 +1259,11 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca)
if (is_raid_device) {
dma->device_is_tx_complete = ioat3_is_complete;
- device->cleanup_tasklet = ioat3_cleanup_tasklet;
+ device->cleanup_fn = ioat3_cleanup_event;
device->timer_fn = ioat3_timer_event;
} else {
- dma->device_is_tx_complete = ioat2_is_complete;
- device->cleanup_tasklet = ioat2_cleanup_tasklet;
+ dma->device_is_tx_complete = ioat_is_dma_complete;
+ device->cleanup_fn = ioat2_cleanup_event;
device->timer_fn = ioat2_timer_event;
}
diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h
index e8ae63baf58..1391798542b 100644
--- a/drivers/dma/ioat/registers.h
+++ b/drivers/dma/ioat/registers.h
@@ -60,7 +60,7 @@
#define IOAT_PERPORTOFFSET_OFFSET 0x0A /* 16-bit */
#define IOAT_INTRDELAY_OFFSET 0x0C /* 16-bit */
-#define IOAT_INTRDELAY_INT_DELAY_MASK 0x3FFF /* Interrupt Delay Time */
+#define IOAT_INTRDELAY_MASK 0x3FFF /* Interrupt Delay Time */
#define IOAT_INTRDELAY_COALESE_SUPPORT 0x8000 /* Interrupt Coalescing Supported */
#define IOAT_DEVICE_STATUS_OFFSET 0x0E /* 16-bit */