#include "registers.h"
#include "hw.h"
-static int ioat_pending_level = 4;
+int ioat_pending_level = 4;
module_param(ioat_pending_level, int, 0644);
MODULE_PARM_DESC(ioat_pending_level,
"high-water mark for pushing ioat descriptors (default: 4)");
-static void ioat_dma_chan_reset_part2(struct work_struct *work);
-static void ioat_dma_chan_watchdog(struct work_struct *work);
-
/* internal functions */
-static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat);
-static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat);
-
-static struct ioat_desc_sw *
-ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat);
-static struct ioat_desc_sw *
-ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat);
-
-static inline struct ioat_chan_common *
-ioat_chan_by_index(struct ioatdma_device *device, int index)
-{
- return device->idx[index];
-}
+static void ioat1_cleanup(struct ioat_dma_chan *ioat);
+static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat);
/**
* ioat_dma_do_interrupt - handler used for single vector interrupt mode
return IRQ_HANDLED;
}
-static void ioat_dma_cleanup_tasklet(unsigned long data);
+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,
+ work_func_t work_fn, void (*tasklet)(unsigned long),
+ unsigned long tasklet_data)
+{
+ struct dma_device *dma = &device->common;
+
+ chan->device = device;
+ chan->reg_base = device->reg_base + (0x80 * (idx + 1));
+ INIT_DELAYED_WORK(&chan->work, work_fn);
+ spin_lock_init(&chan->cleanup_lock);
+ chan->common.device = dma;
+ list_add_tail(&chan->common.device_node, &dma->channels);
+ device->idx[idx] = chan;
+ tasklet_init(&chan->cleanup_task, tasklet, tasklet_data);
+ tasklet_disable(&chan->cleanup_task);
+}
+
+static void ioat1_reset_part2(struct work_struct *work);
/**
- * ioat_dma_enumerate_channels - find and initialize the device's channels
+ * ioat1_dma_enumerate_channels - find and initialize the device's channels
* @device: the device to be enumerated
*/
-static int ioat_dma_enumerate_channels(struct ioatdma_device *device)
+static int ioat1_enumerate_channels(struct ioatdma_device *device)
{
u8 xfercap_scale;
u32 xfercap;
int i;
- struct ioat_chan_common *chan;
struct ioat_dma_chan *ioat;
struct device *dev = &device->pdev->dev;
struct dma_device *dma = &device->common;
#endif
for (i = 0; i < dma->chancnt; i++) {
ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL);
- if (!ioat) {
- dma->chancnt = i;
+ if (!ioat)
break;
- }
- chan = &ioat->base;
- chan->device = device;
- chan->reg_base = device->reg_base + (0x80 * (i + 1));
+ ioat_init_channel(device, &ioat->base, i,
+ ioat1_reset_part2,
+ ioat1_cleanup_tasklet,
+ (unsigned long) ioat);
ioat->xfercap = xfercap;
- ioat->desccount = 0;
- INIT_DELAYED_WORK(&chan->work, ioat_dma_chan_reset_part2);
- spin_lock_init(&chan->cleanup_lock);
spin_lock_init(&ioat->desc_lock);
INIT_LIST_HEAD(&ioat->free_desc);
INIT_LIST_HEAD(&ioat->used_desc);
- /* This should be made common somewhere in dmaengine.c */
- chan->common.device = &device->common;
- list_add_tail(&chan->common.device_node, &dma->channels);
- device->idx[i] = chan;
- tasklet_init(&chan->cleanup_task,
- ioat_dma_cleanup_tasklet,
- (unsigned long) ioat);
- tasklet_disable(&chan->cleanup_task);
}
- return dma->chancnt;
+ dma->chancnt = i;
+ return i;
}
/**
}
}
-static inline void
-__ioat2_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat)
-{
- void __iomem *reg_base = ioat->base.reg_base;
-
- ioat->pending = 0;
- writew(ioat->dmacount, reg_base + IOAT_CHAN_DMACOUNT_OFFSET);
-}
-
-static void ioat2_dma_memcpy_issue_pending(struct dma_chan *chan)
-{
- struct ioat_dma_chan *ioat = to_ioat_chan(chan);
-
- if (ioat->pending > 0) {
- spin_lock_bh(&ioat->desc_lock);
- __ioat2_dma_memcpy_issue_pending(ioat);
- spin_unlock_bh(&ioat->desc_lock);
- }
-}
-
-
/**
- * ioat_dma_chan_reset_part2 - reinit the channel after a reset
+ * ioat1_reset_part2 - reinit the channel after a reset
*/
-static void ioat_dma_chan_reset_part2(struct work_struct *work)
+static void ioat1_reset_part2(struct work_struct *work)
{
struct ioat_chan_common *chan;
struct ioat_dma_chan *ioat;
struct ioat_desc_sw *desc;
+ int dmacount;
+ bool start_null = false;
chan = container_of(work, struct ioat_chan_common, work.work);
ioat = container_of(chan, struct ioat_dma_chan, base);
chan->completion_virt->high = 0;
ioat->pending = 0;
- /*
- * count the descriptors waiting, and be sure to do it
- * right for both the CB1 line and the CB2 ring
- */
- ioat->dmacount = 0;
+ /* count the descriptors waiting */
+ dmacount = 0;
if (ioat->used_desc.prev) {
desc = to_ioat_desc(ioat->used_desc.prev);
do {
- ioat->dmacount++;
+ dmacount++;
desc = to_ioat_desc(desc->node.next);
} while (&desc->node != ioat->used_desc.next);
}
- /*
- * write the new starting descriptor address
- * this puts channel engine into ARMED state
- */
- desc = to_ioat_desc(ioat->used_desc.prev);
- switch (chan->device->version) {
- case IOAT_VER_1_2:
+ if (dmacount) {
+ /*
+ * write the new starting descriptor address
+ * this puts channel engine into ARMED state
+ */
+ desc = to_ioat_desc(ioat->used_desc.prev);
writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF,
chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW);
writel(((u64) desc->txd.phys) >> 32,
writeb(IOAT_CHANCMD_START, chan->reg_base
+ IOAT_CHANCMD_OFFSET(chan->device->version));
- break;
- case IOAT_VER_2_0:
- writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF,
- chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW);
- writel(((u64) desc->txd.phys) >> 32,
- chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH);
-
- /* tell the engine to go with what's left to be done */
- writew(ioat->dmacount,
- chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET);
+ } else
+ start_null = true;
+ spin_unlock_bh(&ioat->desc_lock);
+ spin_unlock_bh(&chan->cleanup_lock);
- break;
- }
dev_err(to_dev(chan),
"chan%d reset - %d descs waiting, %d total desc\n",
- chan_num(chan), ioat->dmacount, ioat->desccount);
+ chan_num(chan), dmacount, ioat->desccount);
- spin_unlock_bh(&ioat->desc_lock);
- spin_unlock_bh(&chan->cleanup_lock);
+ if (start_null)
+ ioat1_dma_start_null_desc(ioat);
}
/**
- * ioat_dma_reset_channel - restart a channel
+ * ioat1_reset_channel - restart a channel
* @ioat: IOAT DMA channel handle
*/
-static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat)
+static void ioat1_reset_channel(struct ioat_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
void __iomem *reg_base = chan->reg_base;
}
/**
- * ioat_dma_chan_watchdog - watch for stuck channels
+ * ioat1_chan_watchdog - watch for stuck channels
*/
-static void ioat_dma_chan_watchdog(struct work_struct *work)
+static void ioat1_chan_watchdog(struct work_struct *work)
{
struct ioatdma_device *device =
container_of(work, struct ioatdma_device, work.work);
chan = ioat_chan_by_index(device, i);
ioat = container_of(chan, struct ioat_dma_chan, base);
- if (chan->device->version == IOAT_VER_1_2
- /* have we started processing anything yet */
- && chan->last_completion
- /* have we completed any since last watchdog cycle? */
+ if (/* have we started processing anything yet */
+ chan->last_completion
+ /* have we completed any since last watchdog cycle? */
&& (chan->last_completion == chan->watchdog_completion)
- /* has TCP stuck on one cookie since last watchdog? */
+ /* has TCP stuck on one cookie since last watchdog? */
&& (chan->watchdog_tcp_cookie == chan->watchdog_last_tcp_cookie)
&& (chan->watchdog_tcp_cookie != chan->completed_cookie)
- /* is there something in the chain to be processed? */
- /* CB1 chain always has at least the last one processed */
+ /* is there something in the chain to be processed? */
+ /* CB1 chain always has at least the last one processed */
&& (ioat->used_desc.prev != ioat->used_desc.next)
&& ioat->pending == 0) {
chan->completion_virt->low = completion_hw.low;
chan->completion_virt->high = completion_hw.high;
} else {
- ioat_dma_reset_channel(ioat);
+ ioat1_reset_channel(ioat);
chan->watchdog_completion = 0;
chan->last_compl_desc_addr_hw = 0;
}
-
- /*
- * for version 2.0 if there are descriptors yet to be processed
- * and the last completed hasn't changed since the last watchdog
- * if they haven't hit the pending level
- * issue the pending to push them through
- * else
- * try resetting the channel
- */
- } else if (chan->device->version == IOAT_VER_2_0
- && ioat->used_desc.prev
- && chan->last_completion
- && chan->last_completion == chan->watchdog_completion) {
-
- if (ioat->pending < ioat_pending_level)
- ioat2_dma_memcpy_issue_pending(&chan->common);
- else {
- ioat_dma_reset_channel(ioat);
- chan->watchdog_completion = 0;
- }
} else {
chan->last_compl_desc_addr_hw = 0;
chan->watchdog_completion = chan->last_completion;
}
+
chan->watchdog_last_tcp_cookie = chan->watchdog_tcp_cookie;
}
chain_tail->hw->next = first->txd.phys;
list_splice_tail_init(&tx->tx_list, &ioat->used_desc);
- ioat->dmacount += desc->tx_cnt;
ioat->pending += desc->tx_cnt;
if (ioat->pending >= ioat_pending_level)
__ioat1_dma_memcpy_issue_pending(ioat);
return cookie;
}
-static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx)
-{
- struct ioat_dma_chan *ioat = to_ioat_chan(tx->chan);
- struct ioat_desc_sw *first = tx_to_ioat_desc(tx);
- struct ioat_desc_sw *new;
- struct ioat_dma_descriptor *hw;
- dma_cookie_t cookie;
- u32 copy;
- size_t len;
- dma_addr_t src, dst;
- 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_flags = first->txd.flags;
- new = first;
-
- /*
- * ioat->desc_lock is still in force in version 2 path
- * it gets unlocked at end of this function
- */
- do {
- copy = min_t(size_t, len, ioat->xfercap);
-
- async_tx_ack(&new->txd);
-
- hw = new->hw;
- hw->size = copy;
- hw->ctl = 0;
- hw->src_addr = src;
- hw->dst_addr = dst;
-
- len -= copy;
- dst += copy;
- src += copy;
- desc_count++;
- } while (len && (new = ioat2_dma_get_next_descriptor(ioat)));
-
- if (!new) {
- dev_err(to_dev(&ioat->base), "tx submit failed\n");
- spin_unlock_bh(&ioat->desc_lock);
- return -ENOMEM;
- }
-
- hw->ctl_f.compl_write = 1;
- if (first->txd.callback) {
- hw->ctl_f.int_en = 1;
- if (first != new) {
- /* move callback into to last desc */
- new->txd.callback = first->txd.callback;
- new->txd.callback_param
- = first->txd.callback_param;
- first->txd.callback = NULL;
- first->txd.callback_param = NULL;
- }
- }
-
- new->tx_cnt = desc_count;
- new->txd.flags = orig_flags; /* client is in control of this ack */
-
- /* store the original values for use in later cleanup */
- if (new != first) {
- new->src = first->src;
- new->dst = first->dst;
- new->len = first->len;
- }
-
- /* cookie incr and addition to used_list must be atomic */
- cookie = ioat->base.common.cookie;
- cookie++;
- if (cookie < 0)
- cookie = 1;
- ioat->base.common.cookie = new->txd.cookie = cookie;
-
- ioat->dmacount += desc_count;
- ioat->pending += desc_count;
- if (ioat->pending >= ioat_pending_level)
- __ioat2_dma_memcpy_issue_pending(ioat);
- spin_unlock_bh(&ioat->desc_lock);
-
- return cookie;
-}
-
/**
* ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair
* @ioat: the channel supplying the memory pool for the descriptors
}
memset(desc, 0, sizeof(*desc));
- dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common);
- switch (ioatdma_device->version) {
- case IOAT_VER_1_2:
- desc_sw->txd.tx_submit = ioat1_tx_submit;
- break;
- case IOAT_VER_2_0:
- case IOAT_VER_3_0:
- desc_sw->txd.tx_submit = ioat2_tx_submit;
- break;
- }
+ dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common);
+ desc_sw->txd.tx_submit = ioat1_tx_submit;
desc_sw->hw = desc;
desc_sw->txd.phys = phys;
static int ioat_initial_desc_count = 256;
module_param(ioat_initial_desc_count, int, 0644);
MODULE_PARM_DESC(ioat_initial_desc_count,
- "initial descriptors per channel (default: 256)");
-
-/**
- * ioat2_dma_massage_chan_desc - link the descriptors into a circle
- * @ioat: the channel to be massaged
- */
-static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat)
-{
- struct ioat_desc_sw *desc, *_desc;
-
- /* setup used_desc */
- ioat->used_desc.next = ioat->free_desc.next;
- ioat->used_desc.prev = NULL;
-
- /* pull free_desc out of the circle so that every node is a hw
- * descriptor, but leave it pointing to the list
- */
- ioat->free_desc.prev->next = ioat->free_desc.next;
- ioat->free_desc.next->prev = ioat->free_desc.prev;
-
- /* circle link the hw descriptors */
- desc = to_ioat_desc(ioat->free_desc.next);
- desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys;
- list_for_each_entry_safe(desc, _desc, ioat->free_desc.next, node) {
- desc->hw->next = to_ioat_desc(desc->node.next)->txd.phys;
- }
-}
-
+ "ioat1: initial descriptors per channel (default: 256)");
/**
- * ioat_dma_alloc_chan_resources - returns the number of allocated descriptors
+ * ioat1_dma_alloc_chan_resources - returns the number of allocated descriptors
* @chan: the channel to be filled out
*/
-static int ioat_dma_alloc_chan_resources(struct dma_chan *c)
+static int ioat1_dma_alloc_chan_resources(struct dma_chan *c)
{
struct ioat_dma_chan *ioat = to_ioat_chan(c);
struct ioat_chan_common *chan = &ioat->base;
spin_lock_bh(&ioat->desc_lock);
ioat->desccount = i;
list_splice(&tmp_list, &ioat->free_desc);
- if (chan->device->version != IOAT_VER_1_2)
- ioat2_dma_massage_chan_desc(ioat);
spin_unlock_bh(&ioat->desc_lock);
/* allocate a completion writeback area */
chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
tasklet_enable(&chan->cleanup_task);
- ioat_dma_start_null_desc(ioat); /* give chain to dma device */
+ ioat1_dma_start_null_desc(ioat); /* give chain to dma device */
return ioat->desccount;
}
/**
- * ioat_dma_free_chan_resources - release all the descriptors
+ * ioat1_dma_free_chan_resources - release all the descriptors
* @chan: the channel to be cleaned
*/
-static void ioat_dma_free_chan_resources(struct dma_chan *c)
+static void ioat1_dma_free_chan_resources(struct dma_chan *c)
{
struct ioat_dma_chan *ioat = to_ioat_chan(c);
struct ioat_chan_common *chan = &ioat->base;
return;
tasklet_disable(&chan->cleanup_task);
- ioat_dma_memcpy_cleanup(ioat);
+ ioat1_cleanup(ioat);
/* Delay 100ms after reset to allow internal DMA logic to quiesce
* before removing DMA descriptor resources.
mdelay(100);
spin_lock_bh(&ioat->desc_lock);
- switch (chan->device->version) {
- case IOAT_VER_1_2:
- list_for_each_entry_safe(desc, _desc,
- &ioat->used_desc, node) {
- in_use_descs++;
- list_del(&desc->node);
- pci_pool_free(ioatdma_device->dma_pool, desc->hw,
- desc->txd.phys);
- kfree(desc);
- }
- list_for_each_entry_safe(desc, _desc,
- &ioat->free_desc, node) {
- list_del(&desc->node);
- pci_pool_free(ioatdma_device->dma_pool, desc->hw,
- desc->txd.phys);
- kfree(desc);
- }
- break;
- case IOAT_VER_2_0:
- case IOAT_VER_3_0:
- list_for_each_entry_safe(desc, _desc,
- ioat->free_desc.next, node) {
- list_del(&desc->node);
- pci_pool_free(ioatdma_device->dma_pool, desc->hw,
- desc->txd.phys);
- kfree(desc);
- }
- desc = to_ioat_desc(ioat->free_desc.next);
+ list_for_each_entry_safe(desc, _desc,
+ &ioat->used_desc, node) {
+ in_use_descs++;
+ list_del(&desc->node);
+ pci_pool_free(ioatdma_device->dma_pool, desc->hw,
+ desc->txd.phys);
+ kfree(desc);
+ }
+ list_for_each_entry_safe(desc, _desc,
+ &ioat->free_desc, node) {
+ list_del(&desc->node);
pci_pool_free(ioatdma_device->dma_pool, desc->hw,
desc->txd.phys);
kfree(desc);
- INIT_LIST_HEAD(&ioat->free_desc);
- INIT_LIST_HEAD(&ioat->used_desc);
- break;
}
spin_unlock_bh(&ioat->desc_lock);
chan->last_compl_desc_addr_hw = 0;
chan->watchdog_tcp_cookie = chan->watchdog_last_tcp_cookie = 0;
ioat->pending = 0;
- ioat->dmacount = 0;
ioat->desccount = 0;
}
return new;
}
-static struct ioat_desc_sw *
-ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat)
-{
- struct ioat_desc_sw *new;
-
- /*
- * used.prev points to where to start processing
- * used.next points to next free descriptor
- * if used.prev == NULL, there are none waiting to be processed
- * if used.next == used.prev.prev, there is only one free descriptor,
- * and we need to use it to as a noop descriptor before
- * linking in a new set of descriptors, since the device
- * has probably already read the pointer to it
- */
- if (ioat->used_desc.prev &&
- ioat->used_desc.next == ioat->used_desc.prev->prev) {
-
- struct ioat_desc_sw *desc;
- struct ioat_desc_sw *noop_desc;
- int i;
-
- /* set up the noop descriptor */
- noop_desc = to_ioat_desc(ioat->used_desc.next);
- /* set size to non-zero value (channel returns error when size is 0) */
- noop_desc->hw->size = NULL_DESC_BUFFER_SIZE;
- noop_desc->hw->ctl = 0;
- noop_desc->hw->ctl_f.null = 1;
- noop_desc->hw->src_addr = 0;
- noop_desc->hw->dst_addr = 0;
-
- ioat->used_desc.next = ioat->used_desc.next->next;
- ioat->pending++;
- ioat->dmacount++;
-
- /* try to get a few more descriptors */
- for (i = 16; i; i--) {
- desc = ioat_dma_alloc_descriptor(ioat, GFP_ATOMIC);
- if (!desc) {
- dev_err(to_dev(&ioat->base),
- "alloc failed\n");
- break;
- }
- list_add_tail(&desc->node, ioat->used_desc.next);
-
- desc->hw->next
- = to_ioat_desc(desc->node.next)->txd.phys;
- to_ioat_desc(desc->node.prev)->hw->next
- = desc->txd.phys;
- ioat->desccount++;
- }
-
- ioat->used_desc.next = noop_desc->node.next;
- }
- new = to_ioat_desc(ioat->used_desc.next);
- prefetch(new);
- ioat->used_desc.next = new->node.next;
-
- if (ioat->used_desc.prev == NULL)
- ioat->used_desc.prev = &new->node;
-
- prefetch(new->hw);
- return new;
-}
-
-static struct ioat_desc_sw *
-ioat_dma_get_next_descriptor(struct ioat_dma_chan *ioat)
-{
- if (!ioat)
- return NULL;
-
- switch (ioat->base.device->version) {
- case IOAT_VER_1_2:
- return ioat1_dma_get_next_descriptor(ioat);
- case IOAT_VER_2_0:
- case IOAT_VER_3_0:
- return ioat2_dma_get_next_descriptor(ioat);
- }
- return NULL;
-}
-
static struct dma_async_tx_descriptor *
ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest,
dma_addr_t dma_src, size_t len, unsigned long flags)
int tx_cnt = 0;
spin_lock_bh(&ioat->desc_lock);
- desc = ioat_dma_get_next_descriptor(ioat);
+ desc = ioat1_dma_get_next_descriptor(ioat);
do {
if (!desc)
break;
struct ioat_desc_sw *next;
async_tx_ack(&desc->txd);
- next = ioat_dma_get_next_descriptor(ioat);
+ next = ioat1_dma_get_next_descriptor(ioat);
hw->next = next ? next->txd.phys : 0;
desc = next;
} else
struct ioat_chan_common *chan = &ioat->base;
dev_err(to_dev(chan),
- "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n",
- chan_num(chan), ioat->dmacount, ioat->desccount);
+ "chan%d - get_next_desc failed\n", chan_num(chan));
list_splice(&chain, &ioat->free_desc);
spin_unlock_bh(&ioat->desc_lock);
return NULL;
return &desc->txd;
}
-static struct dma_async_tx_descriptor *
-ioat2_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest,
- dma_addr_t dma_src, size_t len, unsigned long flags)
-{
- struct ioat_dma_chan *ioat = to_ioat_chan(c);
- struct ioat_desc_sw *new;
-
- spin_lock_bh(&ioat->desc_lock);
- new = ioat2_dma_get_next_descriptor(ioat);
-
- /*
- * leave ioat->desc_lock set in ioat 2 path
- * it will get unlocked at end of tx_submit
- */
-
- if (new) {
- new->len = len;
- new->dst = dma_dest;
- new->src = dma_src;
- new->txd.flags = flags;
- return &new->txd;
- } else {
- struct ioat_chan_common *chan = &ioat->base;
-
- spin_unlock_bh(&ioat->desc_lock);
- dev_err(to_dev(chan),
- "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n",
- chan_num(chan), ioat->dmacount, ioat->desccount);
- return NULL;
- }
-}
-
-static void ioat_dma_cleanup_tasklet(unsigned long data)
+static void ioat1_cleanup_tasklet(unsigned long data)
{
struct ioat_dma_chan *chan = (void *)data;
- ioat_dma_memcpy_cleanup(chan);
+ ioat1_cleanup(chan);
writew(IOAT_CHANCTRL_INT_DISABLE,
chan->base.reg_base + IOAT_CHANCTRL_OFFSET);
}
-static void
-ioat_dma_unmap(struct ioat_chan_common *chan, struct ioat_desc_sw *desc)
+static void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len,
+ int direction, enum dma_ctrl_flags flags, bool dst)
{
- if (!(desc->txd.flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
- if (desc->txd.flags & DMA_COMPL_DEST_UNMAP_SINGLE)
- pci_unmap_single(chan->device->pdev,
- pci_unmap_addr(desc, dst),
- pci_unmap_len(desc, len),
- PCI_DMA_FROMDEVICE);
- else
- pci_unmap_page(chan->device->pdev,
- pci_unmap_addr(desc, dst),
- pci_unmap_len(desc, len),
- PCI_DMA_FROMDEVICE);
- }
-
- if (!(desc->txd.flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
- if (desc->txd.flags & DMA_COMPL_SRC_UNMAP_SINGLE)
- pci_unmap_single(chan->device->pdev,
- pci_unmap_addr(desc, src),
- pci_unmap_len(desc, len),
- PCI_DMA_TODEVICE);
- else
- pci_unmap_page(chan->device->pdev,
- pci_unmap_addr(desc, src),
- pci_unmap_len(desc, len),
- PCI_DMA_TODEVICE);
- }
+ if ((dst && (flags & DMA_COMPL_DEST_UNMAP_SINGLE)) ||
+ (!dst && (flags & DMA_COMPL_SRC_UNMAP_SINGLE)))
+ pci_unmap_single(pdev, addr, len, direction);
+ else
+ pci_unmap_page(pdev, addr, len, direction);
}
-/**
- * ioat_dma_memcpy_cleanup - cleanup up finished descriptors
- * @chan: ioat channel to be cleaned up
- */
-static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat)
+
+void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags,
+ size_t len, struct ioat_dma_descriptor *hw)
{
- struct ioat_chan_common *chan = &ioat->base;
- unsigned long phys_complete;
- struct ioat_desc_sw *desc, *_desc;
- dma_cookie_t cookie = 0;
- unsigned long desc_phys;
- struct ioat_desc_sw *latest_desc;
- struct dma_async_tx_descriptor *tx;
+ struct pci_dev *pdev = chan->device->pdev;
+ size_t offset = len - hw->size;
- prefetch(chan->completion_virt);
+ if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP))
+ ioat_unmap(pdev, hw->dst_addr - offset, len,
+ PCI_DMA_FROMDEVICE, flags, 1);
- if (!spin_trylock_bh(&chan->cleanup_lock))
- return;
+ if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP))
+ ioat_unmap(pdev, hw->src_addr - offset, len,
+ PCI_DMA_TODEVICE, flags, 0);
+}
+
+unsigned long ioat_get_current_completion(struct ioat_chan_common *chan)
+{
+ unsigned long phys_complete;
/* The completion writeback can happen at any time,
so reads by the driver need to be atomic operations
/* TODO do something to salvage the situation */
}
+ return phys_complete;
+}
+
+/**
+ * ioat1_cleanup - cleanup up finished descriptors
+ * @chan: ioat channel to be cleaned up
+ */
+static void ioat1_cleanup(struct ioat_dma_chan *ioat)
+{
+ struct ioat_chan_common *chan = &ioat->base;
+ unsigned long phys_complete;
+ struct ioat_desc_sw *desc, *_desc;
+ dma_cookie_t cookie = 0;
+ struct dma_async_tx_descriptor *tx;
+
+ prefetch(chan->completion_virt);
+
+ if (!spin_trylock_bh(&chan->cleanup_lock))
+ return;
+
+ phys_complete = ioat_get_current_completion(chan);
if (phys_complete == chan->last_completion) {
spin_unlock_bh(&chan->cleanup_lock);
/*
* perhaps we're stuck so hard that the watchdog can't go off?
* try to catch it after 2 seconds
*/
- if (chan->device->version != IOAT_VER_3_0) {
- if (time_after(jiffies,
- chan->last_completion_time + HZ*WATCHDOG_DELAY)) {
- ioat_dma_chan_watchdog(&(chan->device->work.work));
- chan->last_completion_time = jiffies;
- }
+ if (time_after(jiffies,
+ chan->last_completion_time + HZ*WATCHDOG_DELAY)) {
+ ioat1_chan_watchdog(&(chan->device->work.work));
+ chan->last_completion_time = jiffies;
}
return;
}
return;
}
- switch (chan->device->version) {
- case IOAT_VER_1_2:
- list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) {
- tx = &desc->txd;
- /*
- * Incoming DMA requests may use multiple descriptors,
- * due to exceeding xfercap, perhaps. If so, only the
- * last one will have a cookie, and require unmapping.
- */
- if (tx->cookie) {
- cookie = tx->cookie;
- ioat_dma_unmap(chan, desc);
- if (tx->callback) {
- tx->callback(tx->callback_param);
- tx->callback = NULL;
- }
+ list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) {
+ tx = &desc->txd;
+ /*
+ * Incoming DMA requests may use multiple descriptors,
+ * due to exceeding xfercap, perhaps. If so, only the
+ * last one will have a cookie, and require unmapping.
+ */
+ if (tx->cookie) {
+ cookie = tx->cookie;
+ ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw);
+ if (tx->callback) {
+ tx->callback(tx->callback_param);
+ tx->callback = NULL;
}
+ }
- if (tx->phys != phys_complete) {
- /*
- * a completed entry, but not the last, so clean
- * up if the client is done with the descriptor
- */
- if (async_tx_test_ack(tx)) {
- list_move_tail(&desc->node,
- &ioat->free_desc);
- } else
- tx->cookie = 0;
- } else {
- /*
- * last used desc. Do not remove, so we can
- * append from it, but don't look at it next
- * time, either
- */
+ if (tx->phys != phys_complete) {
+ /*
+ * a completed entry, but not the last, so clean
+ * up if the client is done with the descriptor
+ */
+ if (async_tx_test_ack(tx))
+ list_move_tail(&desc->node, &ioat->free_desc);
+ else
tx->cookie = 0;
+ } else {
+ /*
+ * last used desc. Do not remove, so we can
+ * append from it, but don't look at it next
+ * time, either
+ */
+ tx->cookie = 0;
- /* TODO check status bits? */
- break;
- }
- }
- break;
- case IOAT_VER_2_0:
- case IOAT_VER_3_0:
- /* has some other thread has already cleaned up? */
- if (ioat->used_desc.prev == NULL)
+ /* TODO check status bits? */
break;
-
- /* work backwards to find latest finished desc */
- desc = to_ioat_desc(ioat->used_desc.next);
- tx = &desc->txd;
- latest_desc = NULL;
- do {
- desc = to_ioat_desc(desc->node.prev);
- desc_phys = (unsigned long)tx->phys
- & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
- if (desc_phys == phys_complete) {
- latest_desc = desc;
- break;
- }
- } while (&desc->node != ioat->used_desc.prev);
-
- if (latest_desc != NULL) {
- /* work forwards to clear finished descriptors */
- for (desc = to_ioat_desc(ioat->used_desc.prev);
- &desc->node != latest_desc->node.next &&
- &desc->node != ioat->used_desc.next;
- desc = to_ioat_desc(desc->node.next)) {
- if (tx->cookie) {
- cookie = tx->cookie;
- tx->cookie = 0;
- ioat_dma_unmap(chan, desc);
- if (tx->callback) {
- tx->callback(tx->callback_param);
- tx->callback = NULL;
- }
- }
- }
-
- /* move used.prev up beyond those that are finished */
- if (&desc->node == ioat->used_desc.next)
- ioat->used_desc.prev = NULL;
- else
- ioat->used_desc.prev = &desc->node;
}
- break;
}
spin_unlock_bh(&ioat->desc_lock);
spin_unlock_bh(&chan->cleanup_lock);
}
-/**
- * ioat_dma_is_complete - poll the status of a IOAT DMA transaction
- * @chan: IOAT DMA channel handle
- * @cookie: DMA transaction identifier
- * @done: if not %NULL, updated with last completed transaction
- * @used: if not %NULL, updated with last used transaction
- */
static enum dma_status
-ioat_dma_is_complete(struct dma_chan *c, dma_cookie_t cookie,
- dma_cookie_t *done, dma_cookie_t *used)
+ioat1_dma_is_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 = &ioat->base;
- dma_cookie_t last_used;
- dma_cookie_t last_complete;
- enum dma_status ret;
-
- last_used = c->cookie;
- last_complete = chan->completed_cookie;
- chan->watchdog_tcp_cookie = cookie;
-
- if (done)
- *done = last_complete;
- if (used)
- *used = last_used;
-
- ret = dma_async_is_complete(cookie, last_complete, last_used);
- if (ret == DMA_SUCCESS)
- return ret;
- ioat_dma_memcpy_cleanup(ioat);
+ if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS)
+ return DMA_SUCCESS;
- last_used = c->cookie;
- last_complete = chan->completed_cookie;
+ ioat1_cleanup(ioat);
- if (done)
- *done = last_complete;
- if (used)
- *used = last_used;
-
- return dma_async_is_complete(cookie, last_complete, last_used);
+ return ioat_is_complete(c, cookie, done, used);
}
-static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat)
+static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat)
{
struct ioat_chan_common *chan = &ioat->base;
struct ioat_desc_sw *desc;
spin_lock_bh(&ioat->desc_lock);
- desc = ioat_dma_get_next_descriptor(ioat);
+ desc = ioat1_dma_get_next_descriptor(ioat);
if (!desc) {
dev_err(to_dev(chan),
hw->src_addr = 0;
hw->dst_addr = 0;
async_tx_ack(&desc->txd);
- switch (chan->device->version) {
- case IOAT_VER_1_2:
- hw->next = 0;
- list_add_tail(&desc->node, &ioat->used_desc);
+ hw->next = 0;
+ list_add_tail(&desc->node, &ioat->used_desc);
- writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF,
- chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW);
- writel(((u64) desc->txd.phys) >> 32,
- chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH);
-
- writeb(IOAT_CHANCMD_START, chan->reg_base
- + IOAT_CHANCMD_OFFSET(chan->device->version));
- break;
- case IOAT_VER_2_0:
- case IOAT_VER_3_0:
- writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF,
- chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW);
- writel(((u64) desc->txd.phys) >> 32,
- chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH);
+ writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF,
+ chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW);
+ writel(((u64) desc->txd.phys) >> 32,
+ chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH);
- ioat->dmacount++;
- __ioat2_dma_memcpy_issue_pending(ioat);
- break;
- }
+ writeb(IOAT_CHANCMD_START, chan->reg_base
+ + IOAT_CHANCMD_OFFSET(chan->device->version));
spin_unlock_bh(&ioat->desc_lock);
}
writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET);
}
-static int ioat_probe(struct ioatdma_device *device)
+int ioat_probe(struct ioatdma_device *device)
{
int err = -ENODEV;
struct dma_device *dma = &device->common;
device->completion_pool = pci_pool_create("completion_pool", pdev,
sizeof(u64), SMP_CACHE_BYTES,
SMP_CACHE_BYTES);
+
if (!device->completion_pool) {
err = -ENOMEM;
goto err_completion_pool;
}
- ioat_dma_enumerate_channels(device);
+ device->enumerate_channels(device);
dma_cap_set(DMA_MEMCPY, dma->cap_mask);
- dma->device_alloc_chan_resources = ioat_dma_alloc_chan_resources;
- dma->device_free_chan_resources = ioat_dma_free_chan_resources;
- dma->device_is_tx_complete = ioat_dma_is_complete;
dma->dev = &pdev->dev;
dev_err(dev, "Intel(R) I/OAT DMA Engine found,"
return err;
}
-static int ioat_register(struct ioatdma_device *device)
+int ioat_register(struct ioatdma_device *device)
{
int err = dma_async_device_register(&device->common);
int err;
device->intr_quirk = ioat1_intr_quirk;
+ device->enumerate_channels = ioat1_enumerate_channels;
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;
err = ioat_probe(device);
if (err)
if (dca)
device->dca = ioat_dca_init(pdev, device->reg_base);
- INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog);
- schedule_delayed_work(&device->work, WATCHDOG_DELAY);
-
- return err;
-}
-
-int ioat2_dma_probe(struct ioatdma_device *device, int dca)
-{
- struct pci_dev *pdev = device->pdev;
- struct dma_device *dma;
- struct dma_chan *c;
- struct ioat_chan_common *chan;
- int err;
-
- dma = &device->common;
- dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy;
- dma->device_issue_pending = ioat2_dma_memcpy_issue_pending;
-
- err = ioat_probe(device);
- if (err)
- return err;
- ioat_set_tcp_copy_break(2048);
-
- list_for_each_entry(c, &dma->channels, device_node) {
- chan = to_chan_common(c);
- writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | IOAT_DMA_DCA_ANY_CPU,
- chan->reg_base + IOAT_DCACTRL_OFFSET);
- }
-
- err = ioat_register(device);
- if (err)
- return err;
- if (dca)
- device->dca = ioat2_dca_init(pdev, device->reg_base);
-
- INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog);
+ INIT_DELAYED_WORK(&device->work, ioat1_chan_watchdog);
schedule_delayed_work(&device->work, WATCHDOG_DELAY);
return err;
}
-int ioat3_dma_probe(struct ioatdma_device *device, int dca)
-{
- struct pci_dev *pdev = device->pdev;
- struct dma_device *dma;
- struct dma_chan *c;
- struct ioat_chan_common *chan;
- int err;
- u16 dev_id;
-
- dma = &device->common;
- dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy;
- dma->device_issue_pending = ioat2_dma_memcpy_issue_pending;
-
- /* -= IOAT ver.3 workarounds =- */
- /* Write CHANERRMSK_INT with 3E07h to mask out the errors
- * that can cause stability issues for IOAT ver.3
- */
- pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07);
-
- /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit
- * (workaround for spurious config parity error after restart)
- */
- pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id);
- if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0)
- pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10);
-
- err = ioat_probe(device);
- if (err)
- return err;
- ioat_set_tcp_copy_break(262144);
-
- list_for_each_entry(c, &dma->channels, device_node) {
- chan = to_chan_common(c);
- writel(IOAT_DMA_DCA_ANY_CPU,
- chan->reg_base + IOAT_DCACTRL_OFFSET);
- }
-
- err = ioat_register(device);
- if (err)
- return err;
- if (dca)
- device->dca = ioat3_dca_init(pdev, device->reg_base);
-
- return err;
-}
-
void ioat_dma_remove(struct ioatdma_device *device)
{
struct dma_device *dma = &device->common;
INIT_LIST_HEAD(&dma->channels);
}
-
--- /dev/null
+/*
+ * Intel I/OAT DMA Linux driver
+ * Copyright(c) 2004 - 2009 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ */
+
+/*
+ * This driver supports an Intel I/OAT DMA engine (versions >= 2), which
+ * does asynchronous data movement and checksumming operations.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/workqueue.h>
+#include <linux/i7300_idle.h>
+#include "dma.h"
+#include "dma_v2.h"
+#include "registers.h"
+#include "hw.h"
+
+static int ioat_ring_alloc_order = 8;
+module_param(ioat_ring_alloc_order, int, 0644);
+MODULE_PARM_DESC(ioat_ring_alloc_order,
+ "ioat2+: allocate 2^n descriptors per channel (default: n=8)");
+
+static void __ioat2_issue_pending(struct ioat2_dma_chan *ioat)
+{
+ void * __iomem reg_base = ioat->base.reg_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);
+
+}
+
+static void ioat2_issue_pending(struct dma_chan *chan)
+{
+ struct ioat2_dma_chan *ioat = to_ioat2_chan(chan);
+
+ spin_lock_bh(&ioat->ring_lock);
+ if (ioat->pending == 1)
+ __ioat2_issue_pending(ioat);
+ 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
+ */
+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)
+ __ioat2_issue_pending(ioat);
+ else
+ ioat->pending = 1;
+}
+
+static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat)
+{
+ void __iomem *reg_base = ioat->base.reg_base;
+ struct ioat_ring_ent *desc;
+ struct ioat_dma_descriptor *hw;
+ int idx;
+
+ if (ioat2_ring_space(ioat) < 1) {
+ dev_err(to_dev(&ioat->base),
+ "Unable to start null desc - ring full\n");
+ return;
+ }
+
+ idx = ioat2_desc_alloc(ioat, 1);
+ desc = ioat2_get_ring_ent(ioat, idx);
+
+ hw = desc->hw;
+ hw->ctl = 0;
+ hw->ctl_f.null = 1;
+ hw->ctl_f.int_en = 1;
+ hw->ctl_f.compl_write = 1;
+ /* set size to non-zero value (channel returns error when size is 0) */
+ hw->size = NULL_DESC_BUFFER_SIZE;
+ hw->src_addr = 0;
+ hw->dst_addr = 0;
+ async_tx_ack(&desc->txd);
+ writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF,
+ reg_base + IOAT2_CHAINADDR_OFFSET_LOW);
+ writel(((u64) desc->txd.phys) >> 32,
+ reg_base + IOAT2_CHAINADDR_OFFSET_HIGH);
+ __ioat2_issue_pending(ioat);
+}
+
+static void ioat2_start_null_desc(struct ioat2_dma_chan *ioat)
+{
+ spin_lock_bh(&ioat->ring_lock);
+ __ioat2_start_null_desc(ioat);
+ spin_unlock_bh(&ioat->ring_lock);
+}
+
+static void ioat2_cleanup(struct ioat2_dma_chan *ioat);
+
+/**
+ * ioat2_reset_part2 - reinit the channel after a reset
+ */
+static void ioat2_reset_part2(struct work_struct *work)
+{
+ struct ioat_chan_common *chan;
+ struct ioat2_dma_chan *ioat;
+
+ chan = container_of(work, struct ioat_chan_common, work.work);
+ ioat = container_of(chan, struct ioat2_dma_chan, base);
+
+ /* ensure that ->tail points to the stalled descriptor
+ * (ioat->pending is set to 2 at this point so no new
+ * descriptors will be issued while we perform this cleanup)
+ */
+ ioat2_cleanup(ioat);
+
+ spin_lock_bh(&chan->cleanup_lock);
+ spin_lock_bh(&ioat->ring_lock);
+
+ /* set the tail to be re-issued */
+ ioat->issued = ioat->tail;
+ ioat->dmacount = 0;
+
+ if (ioat2_ring_pending(ioat)) {
+ struct ioat_ring_ent *desc;
+
+ desc = ioat2_get_ring_ent(ioat, ioat->tail);
+ writel(((u64) desc->txd.phys) & 0x00000000FFFFFFFF,
+ chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW);
+ writel(((u64) desc->txd.phys) >> 32,
+ chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH);
+ __ioat2_issue_pending(ioat);
+ } else
+ __ioat2_start_null_desc(ioat);
+
+ spin_unlock_bh(&ioat->ring_lock);
+ spin_unlock_bh(&chan->cleanup_lock);
+
+ dev_info(to_dev(chan),
+ "chan%d reset - %d descs waiting, %d total desc\n",
+ chan_num(chan), ioat->dmacount, 1 << ioat->alloc_order);
+}
+
+/**
+ * ioat2_reset_channel - restart a channel
+ * @ioat: IOAT DMA channel handle
+ */
+static void ioat2_reset_channel(struct ioat2_dma_chan *ioat)
+{
+ u32 chansts, chanerr;
+ struct ioat_chan_common *chan = &ioat->base;
+ u16 active;
+
+ spin_lock_bh(&ioat->ring_lock);
+ active = ioat2_ring_active(ioat);
+ spin_unlock_bh(&ioat->ring_lock);
+ if (!active)
+ return;
+
+ chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
+ chansts = (chan->completion_virt->low
+ & IOAT_CHANSTS_DMA_TRANSFER_STATUS);
+ if (chanerr) {
+ dev_err(to_dev(chan),
+ "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n",
+ chan_num(chan), chansts, chanerr);
+ writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET);
+ }
+
+ spin_lock_bh(&ioat->ring_lock);
+ ioat->pending = 2;
+ writeb(IOAT_CHANCMD_RESET,
+ chan->reg_base
+ + IOAT_CHANCMD_OFFSET(chan->device->version));
+ spin_unlock_bh(&ioat->ring_lock);
+ schedule_delayed_work(&chan->work, RESET_DELAY);
+}
+
+/**
+ * ioat2_chan_watchdog - watch for stuck channels
+ */
+static void ioat2_chan_watchdog(struct work_struct *work)
+{
+ struct ioatdma_device *device =
+ container_of(work, struct ioatdma_device, work.work);
+ struct ioat2_dma_chan *ioat;
+ struct ioat_chan_common *chan;
+ u16 active;
+ int i;
+
+ for (i = 0; i < device->common.chancnt; i++) {
+ chan = ioat_chan_by_index(device, i);
+ ioat = container_of(chan, struct ioat2_dma_chan, base);
+
+ /*
+ * for version 2.0 if there are descriptors yet to be processed
+ * and the last completed hasn't changed since the last watchdog
+ * if they haven't hit the pending level
+ * issue the pending to push them through
+ * else
+ * try resetting the channel
+ */
+ spin_lock_bh(&ioat->ring_lock);
+ active = ioat2_ring_active(ioat);
+ spin_unlock_bh(&ioat->ring_lock);
+
+ if (active &&
+ chan->last_completion &&
+ chan->last_completion == chan->watchdog_completion) {
+
+ if (ioat->pending == 1)
+ ioat2_issue_pending(&chan->common);
+ else {
+ ioat2_reset_channel(ioat);
+ chan->watchdog_completion = 0;
+ }
+ } else {
+ chan->last_compl_desc_addr_hw = 0;
+ chan->watchdog_completion = chan->last_completion;
+ }
+ chan->watchdog_last_tcp_cookie = chan->watchdog_tcp_cookie;
+ }
+ schedule_delayed_work(&device->work, WATCHDOG_DELAY);
+}
+
+/**
+ * ioat2_cleanup - clean finished descriptors (advance tail pointer)
+ * @chan: ioat channel to be cleaned up
+ */
+static void ioat2_cleanup(struct ioat2_dma_chan *ioat)
+{
+ struct ioat_chan_common *chan = &ioat->base;
+ unsigned long phys_complete;
+ struct ioat_ring_ent *desc;
+ bool seen_current = false;
+ u16 active;
+ int i;
+ struct dma_async_tx_descriptor *tx;
+
+ prefetch(chan->completion_virt);
+
+ spin_lock_bh(&chan->cleanup_lock);
+ phys_complete = ioat_get_current_completion(chan);
+ if (phys_complete == chan->last_completion) {
+ spin_unlock_bh(&chan->cleanup_lock);
+ /*
+ * perhaps we're stuck so hard that the watchdog can't go off?
+ * try to catch it after WATCHDOG_DELAY seconds
+ */
+ if (chan->device->version < IOAT_VER_3_0) {
+ unsigned long tmo;
+
+ tmo = chan->last_completion_time + HZ*WATCHDOG_DELAY;
+ if (time_after(jiffies, tmo)) {
+ ioat2_chan_watchdog(&(chan->device->work.work));
+ chan->last_completion_time = jiffies;
+ }
+ }
+ return;
+ }
+ chan->last_completion_time = jiffies;
+
+ spin_lock_bh(&ioat->ring_lock);
+
+ active = ioat2_ring_active(ioat);
+ for (i = 0; i < active && !seen_current; i++) {
+ prefetch(ioat2_get_ring_ent(ioat, ioat->tail + i + 1));
+ desc = ioat2_get_ring_ent(ioat, ioat->tail + i);
+ tx = &desc->txd;
+ if (tx->cookie) {
+ ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw);
+ chan->completed_cookie = tx->cookie;
+ tx->cookie = 0;
+ if (tx->callback) {
+ tx->callback(tx->callback_param);
+ tx->callback = NULL;
+ }
+ }
+
+ if (tx->phys == phys_complete)
+ seen_current = true;
+ }
+ ioat->tail += i;
+ BUG_ON(!seen_current); /* no active descs have written a completion? */
+ spin_unlock_bh(&ioat->ring_lock);
+
+ chan->last_completion = phys_complete;
+
+ spin_unlock_bh(&chan->cleanup_lock);
+}
+
+static void ioat2_cleanup_tasklet(unsigned long data)
+{
+ struct ioat2_dma_chan *ioat = (void *) data;
+
+ ioat2_cleanup(ioat);
+ writew(IOAT_CHANCTRL_INT_DISABLE,
+ ioat->base.reg_base + IOAT_CHANCTRL_OFFSET);
+}
+
+/**
+ * ioat2_enumerate_channels - find and initialize the device's channels
+ * @device: the device to be enumerated
+ */
+static int ioat2_enumerate_channels(struct ioatdma_device *device)
+{
+ struct ioat2_dma_chan *ioat;
+ struct device *dev = &device->pdev->dev;
+ struct dma_device *dma = &device->common;
+ u8 xfercap_log;
+ int i;
+
+ INIT_LIST_HEAD(&dma->channels);
+ dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET);
+ xfercap_log = readb(device->reg_base + IOAT_XFERCAP_OFFSET);
+ if (xfercap_log == 0)
+ return 0;
+
+ /* FIXME which i/oat version is i7300? */
+#ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL
+ if (i7300_idle_platform_probe(NULL, NULL, 1) == 0)
+ dma->chancnt--;
+#endif
+ for (i = 0; i < dma->chancnt; i++) {
+ ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL);
+ if (!ioat)
+ break;
+
+ ioat_init_channel(device, &ioat->base, i,
+ ioat2_reset_part2,
+ ioat2_cleanup_tasklet,
+ (unsigned long) ioat);
+ ioat->xfercap_log = xfercap_log;
+ spin_lock_init(&ioat->ring_lock);
+ }
+ dma->chancnt = i;
+ return i;
+}
+
+static dma_cookie_t ioat2_tx_submit_unlock(struct dma_async_tx_descriptor *tx)
+{
+ struct dma_chan *c = tx->chan;
+ struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
+ dma_cookie_t cookie = c->cookie;
+
+ cookie++;
+ if (cookie < 0)
+ cookie = 1;
+ tx->cookie = cookie;
+ c->cookie = cookie;
+ ioat2_update_pending(ioat);
+ spin_unlock_bh(&ioat->ring_lock);
+
+ return cookie;
+}
+
+static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan)
+{
+ struct ioat_dma_descriptor *hw;
+ struct ioat_ring_ent *desc;
+ struct ioatdma_device *dma;
+ dma_addr_t phys;
+
+ dma = to_ioatdma_device(chan->device);
+ hw = pci_pool_alloc(dma->dma_pool, GFP_KERNEL, &phys);
+ if (!hw)
+ return NULL;
+ memset(hw, 0, sizeof(*hw));
+
+ desc = kzalloc(sizeof(*desc), GFP_KERNEL);
+ if (!desc) {
+ pci_pool_free(dma->dma_pool, hw, phys);
+ return NULL;
+ }
+
+ dma_async_tx_descriptor_init(&desc->txd, chan);
+ desc->txd.tx_submit = ioat2_tx_submit_unlock;
+ desc->hw = hw;
+ desc->txd.phys = phys;
+ return desc;
+}
+
+static void ioat2_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan)
+{
+ struct ioatdma_device *dma;
+
+ dma = to_ioatdma_device(chan->device);
+ pci_pool_free(dma->dma_pool, desc->hw, desc->txd.phys);
+ kfree(desc);
+}
+
+/* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring
+ * @chan: channel to be initialized
+ */
+static int ioat2_alloc_chan_resources(struct dma_chan *c)
+{
+ struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
+ struct ioat_chan_common *chan = &ioat->base;
+ struct ioat_ring_ent **ring;
+ u16 chanctrl;
+ u32 chanerr;
+ int descs;
+ int i;
+
+ /* have we already been set up? */
+ if (ioat->ring)
+ return 1 << ioat->alloc_order;
+
+ /* Setup register to interrupt and write completion status on error */
+ chanctrl = IOAT_CHANCTRL_ERR_INT_EN | IOAT_CHANCTRL_ANY_ERR_ABORT_EN |
+ IOAT_CHANCTRL_ERR_COMPLETION_EN;
+ writew(chanctrl, chan->reg_base + IOAT_CHANCTRL_OFFSET);
+
+ chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);
+ if (chanerr) {
+ dev_err(to_dev(chan), "CHANERR = %x, clearing\n", chanerr);
+ writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET);
+ }
+
+ /* allocate a completion writeback area */
+ /* doing 2 32bit writes to mmio since 1 64b write doesn't work */
+ chan->completion_virt = pci_pool_alloc(chan->device->completion_pool,
+ GFP_KERNEL,
+ &chan->completion_addr);
+ if (!chan->completion_virt)
+ return -ENOMEM;
+
+ memset(chan->completion_virt, 0,
+ sizeof(*chan->completion_virt));
+ writel(((u64) chan->completion_addr) & 0x00000000FFFFFFFF,
+ chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
+ writel(((u64) chan->completion_addr) >> 32,
+ chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
+
+ ioat->alloc_order = ioat_get_alloc_order();
+ descs = 1 << ioat->alloc_order;
+
+ /* allocate the array to hold the software ring */
+ ring = kcalloc(descs, sizeof(*ring), GFP_KERNEL);
+ if (!ring)
+ return -ENOMEM;
+ for (i = 0; i < descs; i++) {
+ ring[i] = ioat2_alloc_ring_ent(c);
+ if (!ring[i]) {
+ while (i--)
+ ioat2_free_ring_ent(ring[i], c);
+ kfree(ring);
+ return -ENOMEM;
+ }
+ }
+
+ /* link descs */
+ for (i = 0; i < descs-1; i++) {
+ struct ioat_ring_ent *next = ring[i+1];
+ struct ioat_dma_descriptor *hw = ring[i]->hw;
+
+ hw->next = next->txd.phys;
+ }
+ ring[i]->hw->next = ring[0]->txd.phys;
+
+ spin_lock_bh(&ioat->ring_lock);
+ ioat->ring = ring;
+ ioat->head = 0;
+ ioat->issued = 0;
+ ioat->tail = 0;
+ ioat->pending = 0;
+ spin_unlock_bh(&ioat->ring_lock);
+
+ tasklet_enable(&chan->cleanup_task);
+ ioat2_start_null_desc(ioat);
+
+ return descs;
+}
+
+/**
+ * ioat2_alloc_and_lock - common descriptor alloc boilerplate for ioat2,3 ops
+ * @idx: gets starting descriptor index on successful allocation
+ * @ioat: ioat2,3 channel (ring) to operate on
+ * @num_descs: allocation length
+ */
+static int ioat2_alloc_and_lock(u16 *idx, struct ioat2_dma_chan *ioat, int num_descs)
+{
+ struct ioat_chan_common *chan = &ioat->base;
+
+ spin_lock_bh(&ioat->ring_lock);
+ if (unlikely(ioat2_ring_space(ioat) < num_descs)) {
+ if (printk_ratelimit())
+ dev_dbg(to_dev(chan),
+ "%s: ring full! num_descs: %d (%x:%x:%x)\n",
+ __func__, num_descs, ioat->head, ioat->tail,
+ ioat->issued);
+ spin_unlock_bh(&ioat->ring_lock);
+
+ /* do direct reclaim in the allocation failure case */
+ ioat2_cleanup(ioat);
+
+ return -ENOMEM;
+ }
+
+ dev_dbg(to_dev(chan), "%s: num_descs: %d (%x:%x:%x)\n",
+ __func__, num_descs, ioat->head, ioat->tail, ioat->issued);
+
+ *idx = ioat2_desc_alloc(ioat, num_descs);
+ return 0; /* with ioat->ring_lock held */
+}
+
+static struct dma_async_tx_descriptor *
+ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest,
+ dma_addr_t dma_src, size_t len, unsigned long flags)
+{
+ struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
+ struct ioat_dma_descriptor *hw;
+ struct ioat_ring_ent *desc;
+ dma_addr_t dst = dma_dest;
+ dma_addr_t src = dma_src;
+ size_t total_len = len;
+ int num_descs;
+ u16 idx;
+ int i;
+
+ num_descs = ioat2_xferlen_to_descs(ioat, len);
+ if (likely(num_descs) &&
+ ioat2_alloc_and_lock(&idx, ioat, num_descs) == 0)
+ /* pass */;
+ else
+ return NULL;
+ for (i = 0; i < num_descs; i++) {
+ size_t copy = min_t(size_t, len, 1 << ioat->xfercap_log);
+
+ desc = ioat2_get_ring_ent(ioat, idx + i);
+ hw = desc->hw;
+
+ hw->size = copy;
+ hw->ctl = 0;
+ hw->src_addr = src;
+ hw->dst_addr = dst;
+
+ len -= copy;
+ dst += copy;
+ src += copy;
+ }
+
+ desc->txd.flags = flags;
+ desc->len = total_len;
+ hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
+ hw->ctl_f.compl_write = 1;
+ /* we leave the channel locked to ensure in order submission */
+
+ return &desc->txd;
+}
+
+/**
+ * ioat2_free_chan_resources - release all the descriptors
+ * @chan: the channel to be cleaned
+ */
+static void ioat2_free_chan_resources(struct dma_chan *c)
+{
+ struct ioat2_dma_chan *ioat = to_ioat2_chan(c);
+ struct ioat_chan_common *chan = &ioat->base;
+ struct ioatdma_device *ioatdma_device = chan->device;
+ struct ioat_ring_ent *desc;
+ const u16 total_descs = 1 << ioat->alloc_order;
+ int descs;
+ int i;
+
+ /* Before freeing channel resources first check
+ * if they have been previously allocated for this channel.
+ */
+ if (!ioat->ring)
+ return;
+
+ tasklet_disable(&chan->cleanup_task);
+ ioat2_cleanup(ioat);
+
+ /* Delay 100ms after reset to allow internal DMA logic to quiesce
+ * before removing DMA descriptor resources.
+ */
+ writeb(IOAT_CHANCMD_RESET,
+ chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version));
+ mdelay(100);
+
+ spin_lock_bh(&ioat->ring_lock);
+ descs = ioat2_ring_space(ioat);
+ for (i = 0; i < descs; i++) {
+ desc = ioat2_get_ring_ent(ioat, ioat->head + i);
+ ioat2_free_ring_ent(desc, c);
+ }
+
+ if (descs < total_descs)
+ dev_err(to_dev(chan), "Freeing %d in use descriptors!\n",
+ total_descs - descs);
+
+ for (i = 0; i < total_descs - descs; i++) {
+ desc = ioat2_get_ring_ent(ioat, ioat->tail + i);
+ ioat2_free_ring_ent(desc, c);
+ }
+
+ kfree(ioat->ring);
+ ioat->ring = NULL;
+ ioat->alloc_order = 0;
+ pci_pool_free(ioatdma_device->completion_pool,
+ chan->completion_virt,
+ chan->completion_addr);
+ spin_unlock_bh(&ioat->ring_lock);
+
+ chan->last_completion = 0;
+ chan->completion_addr = 0;
+ ioat->pending = 0;
+ ioat->dmacount = 0;
+ chan->watchdog_completion = 0;
+ chan->last_compl_desc_addr_hw = 0;
+ chan->watchdog_tcp_cookie = 0;
+ chan->watchdog_last_tcp_cookie = 0;
+}
+
+static 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);
+
+ if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS)
+ return DMA_SUCCESS;
+
+ ioat2_cleanup(ioat);
+
+ return ioat_is_complete(c, cookie, done, used);
+}
+
+int ioat2_dma_probe(struct ioatdma_device *device, int dca)
+{
+ struct pci_dev *pdev = device->pdev;
+ struct dma_device *dma;
+ struct dma_chan *c;
+ struct ioat_chan_common *chan;
+ int err;
+
+ device->enumerate_channels = ioat2_enumerate_channels;
+ dma = &device->common;
+ dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock;
+ 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;
+
+ err = ioat_probe(device);
+ if (err)
+ return err;
+ ioat_set_tcp_copy_break(2048);
+
+ list_for_each_entry(c, &dma->channels, device_node) {
+ chan = to_chan_common(c);
+ writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | IOAT_DMA_DCA_ANY_CPU,
+ chan->reg_base + IOAT_DCACTRL_OFFSET);
+ }
+
+ err = ioat_register(device);
+ if (err)
+ return err;
+ if (dca)
+ device->dca = ioat2_dca_init(pdev, device->reg_base);
+
+ INIT_DELAYED_WORK(&device->work, ioat2_chan_watchdog);
+ schedule_delayed_work(&device->work, WATCHDOG_DELAY);
+
+ return err;
+}
+
+int ioat3_dma_probe(struct ioatdma_device *device, int dca)
+{
+ struct pci_dev *pdev = device->pdev;
+ struct dma_device *dma;
+ struct dma_chan *c;
+ struct ioat_chan_common *chan;
+ int err;
+ u16 dev_id;
+
+ device->enumerate_channels = ioat2_enumerate_channels;
+ dma = &device->common;
+ dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock;
+ 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;
+
+ /* -= IOAT ver.3 workarounds =- */
+ /* Write CHANERRMSK_INT with 3E07h to mask out the errors
+ * that can cause stability issues for IOAT ver.3
+ */
+ pci_write_config_dword(pdev, IOAT_PCI_CHANERRMASK_INT_OFFSET, 0x3e07);
+
+ /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit
+ * (workaround for spurious config parity error after restart)
+ */
+ pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id);
+ if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0)
+ pci_write_config_dword(pdev, IOAT_PCI_DMAUNCERRSTS_OFFSET, 0x10);
+
+ err = ioat_probe(device);
+ if (err)
+ return err;
+ ioat_set_tcp_copy_break(262144);
+
+ list_for_each_entry(c, &dma->channels, device_node) {
+ chan = to_chan_common(c);
+ writel(IOAT_DMA_DCA_ANY_CPU,
+ chan->reg_base + IOAT_DCACTRL_OFFSET);
+ }
+
+ err = ioat_register(device);
+ if (err)
+ return err;
+ if (dca)
+ device->dca = ioat3_dca_init(pdev, device->reg_base);
+
+ return err;
+}
projects / users / jedix / linux-maple.git / commitdiff