#include "ioatdma_registers.h"
#include "ioatdma_hw.h"
-#define INITIAL_IOAT_DESC_COUNT 128
-
#define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common)
#define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common)
#define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node)
#define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, async_tx)
+static 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)");
+
/* internal functions */
static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan);
static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan);
-static struct ioat_dma_chan *ioat_lookup_chan_by_index(struct ioatdma_device *device,
- int index)
+static struct ioat_desc_sw *
+ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan);
+static struct ioat_desc_sw *
+ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan);
+
+static inline struct ioat_dma_chan *ioat_lookup_chan_by_index(
+ struct ioatdma_device *device,
+ int index)
{
return device->idx[index];
}
ioat_chan->device = device;
ioat_chan->reg_base = device->reg_base + (0x80 * (i + 1));
ioat_chan->xfercap = xfercap;
+ ioat_chan->desccount = 0;
+ if (ioat_chan->device->version != IOAT_VER_1_2) {
+ writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE
+ | IOAT_DMA_DCA_ANY_CPU,
+ ioat_chan->reg_base + IOAT_DCACTRL_OFFSET);
+ }
spin_lock_init(&ioat_chan->cleanup_lock);
spin_lock_init(&ioat_chan->desc_lock);
INIT_LIST_HEAD(&ioat_chan->free_desc);
return device->common.chancnt;
}
-static void ioat_set_src(dma_addr_t addr,
- struct dma_async_tx_descriptor *tx,
- int index)
+/**
+ * ioat_dma_memcpy_issue_pending - push potentially unrecognized appended
+ * descriptors to hw
+ * @chan: DMA channel handle
+ */
+static inline void __ioat1_dma_memcpy_issue_pending(
+ struct ioat_dma_chan *ioat_chan)
{
- struct ioat_desc_sw *iter, *desc = tx_to_ioat_desc(tx);
- struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan);
+ ioat_chan->pending = 0;
+ writeb(IOAT_CHANCMD_APPEND, ioat_chan->reg_base + IOAT1_CHANCMD_OFFSET);
+}
- pci_unmap_addr_set(desc, src, addr);
+static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan)
+{
+ struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
- list_for_each_entry(iter, &desc->async_tx.tx_list, node) {
- iter->hw->src_addr = addr;
- addr += ioat_chan->xfercap;
+ if (ioat_chan->pending != 0) {
+ spin_lock_bh(&ioat_chan->desc_lock);
+ __ioat1_dma_memcpy_issue_pending(ioat_chan);
+ spin_unlock_bh(&ioat_chan->desc_lock);
}
-
}
-static void ioat_set_dest(dma_addr_t addr,
- struct dma_async_tx_descriptor *tx,
- int index)
+static inline void __ioat2_dma_memcpy_issue_pending(
+ struct ioat_dma_chan *ioat_chan)
{
- struct ioat_desc_sw *iter, *desc = tx_to_ioat_desc(tx);
- struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan);
+ ioat_chan->pending = 0;
+ writew(ioat_chan->dmacount,
+ ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET);
+}
- pci_unmap_addr_set(desc, dst, addr);
+static void ioat2_dma_memcpy_issue_pending(struct dma_chan *chan)
+{
+ struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
- list_for_each_entry(iter, &desc->async_tx.tx_list, node) {
- iter->hw->dst_addr = addr;
- addr += ioat_chan->xfercap;
+ if (ioat_chan->pending != 0) {
+ spin_lock_bh(&ioat_chan->desc_lock);
+ __ioat2_dma_memcpy_issue_pending(ioat_chan);
+ spin_unlock_bh(&ioat_chan->desc_lock);
}
}
-static dma_cookie_t ioat_tx_submit(struct dma_async_tx_descriptor *tx)
+static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
{
struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan);
- struct ioat_desc_sw *desc = tx_to_ioat_desc(tx);
- int append = 0;
+ struct ioat_desc_sw *first = tx_to_ioat_desc(tx);
+ struct ioat_desc_sw *prev, *new;
+ struct ioat_dma_descriptor *hw;
dma_cookie_t cookie;
- struct ioat_desc_sw *group_start;
+ LIST_HEAD(new_chain);
+ 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->async_tx.flags;
+ new = first;
- group_start = list_entry(desc->async_tx.tx_list.next,
- struct ioat_desc_sw, node);
spin_lock_bh(&ioat_chan->desc_lock);
+ prev = to_ioat_desc(ioat_chan->used_desc.prev);
+ prefetch(prev->hw);
+ do {
+ copy = min_t(size_t, len, ioat_chan->xfercap);
+
+ async_tx_ack(&new->async_tx);
+
+ hw = new->hw;
+ hw->size = copy;
+ hw->ctl = 0;
+ hw->src_addr = src;
+ hw->dst_addr = dst;
+ hw->next = 0;
+
+ /* chain together the physical address list for the HW */
+ wmb();
+ prev->hw->next = (u64) new->async_tx.phys;
+
+ len -= copy;
+ dst += copy;
+ src += copy;
+
+ list_add_tail(&new->node, &new_chain);
+ desc_count++;
+ prev = new;
+ } while (len && (new = ioat1_dma_get_next_descriptor(ioat_chan)));
+
+ hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
+ if (new->async_tx.callback) {
+ hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN;
+ if (first != new) {
+ /* move callback into to last desc */
+ new->async_tx.callback = first->async_tx.callback;
+ new->async_tx.callback_param
+ = first->async_tx.callback_param;
+ first->async_tx.callback = NULL;
+ first->async_tx.callback_param = NULL;
+ }
+ }
+
+ new->tx_cnt = desc_count;
+ 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) {
+ new->src = first->src;
+ new->dst = first->dst;
+ new->len = first->len;
+ }
+
/* cookie incr and addition to used_list must be atomic */
cookie = ioat_chan->common.cookie;
cookie++;
if (cookie < 0)
cookie = 1;
- ioat_chan->common.cookie = desc->async_tx.cookie = cookie;
+ ioat_chan->common.cookie = new->async_tx.cookie = cookie;
/* write address into NextDescriptor field of last desc in chain */
to_ioat_desc(ioat_chan->used_desc.prev)->hw->next =
- group_start->async_tx.phys;
- list_splice_init(&desc->async_tx.tx_list, ioat_chan->used_desc.prev);
+ first->async_tx.phys;
+ __list_splice(&new_chain, ioat_chan->used_desc.prev);
- ioat_chan->pending += desc->tx_cnt;
- if (ioat_chan->pending >= 4) {
- append = 1;
- ioat_chan->pending = 0;
- }
+ ioat_chan->dmacount += desc_count;
+ ioat_chan->pending += desc_count;
+ if (ioat_chan->pending >= ioat_pending_level)
+ __ioat1_dma_memcpy_issue_pending(ioat_chan);
spin_unlock_bh(&ioat_chan->desc_lock);
- if (append)
- writeb(IOAT_CHANCMD_APPEND,
- ioat_chan->reg_base + IOAT_CHANCMD_OFFSET);
+ return cookie;
+}
+
+static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+ struct ioat_dma_chan *ioat_chan = 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->async_tx.flags;
+ new = first;
+
+ /*
+ * ioat_chan->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_chan->xfercap);
+
+ async_tx_ack(&new->async_tx);
+
+ 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_chan)));
+
+ hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
+ if (new->async_tx.callback) {
+ hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN;
+ if (first != new) {
+ /* move callback into to last desc */
+ new->async_tx.callback = first->async_tx.callback;
+ new->async_tx.callback_param
+ = first->async_tx.callback_param;
+ first->async_tx.callback = NULL;
+ first->async_tx.callback_param = NULL;
+ }
+ }
+
+ new->tx_cnt = desc_count;
+ 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) {
+ new->src = first->src;
+ new->dst = first->dst;
+ new->len = first->len;
+ }
+
+ /* cookie incr and addition to used_list must be atomic */
+ cookie = ioat_chan->common.cookie;
+ cookie++;
+ if (cookie < 0)
+ cookie = 1;
+ ioat_chan->common.cookie = new->async_tx.cookie = cookie;
+
+ ioat_chan->dmacount += desc_count;
+ ioat_chan->pending += desc_count;
+ if (ioat_chan->pending >= ioat_pending_level)
+ __ioat2_dma_memcpy_issue_pending(ioat_chan);
+ spin_unlock_bh(&ioat_chan->desc_lock);
return cookie;
}
+/**
+ * ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair
+ * @ioat_chan: the channel supplying the memory pool for the descriptors
+ * @flags: allocation flags
+ */
static struct ioat_desc_sw *ioat_dma_alloc_descriptor(
struct ioat_dma_chan *ioat_chan,
gfp_t flags)
memset(desc, 0, sizeof(*desc));
dma_async_tx_descriptor_init(&desc_sw->async_tx, &ioat_chan->common);
- desc_sw->async_tx.tx_set_src = ioat_set_src;
- desc_sw->async_tx.tx_set_dest = ioat_set_dest;
- desc_sw->async_tx.tx_submit = ioat_tx_submit;
+ switch (ioat_chan->device->version) {
+ case IOAT_VER_1_2:
+ desc_sw->async_tx.tx_submit = ioat1_tx_submit;
+ break;
+ case IOAT_VER_2_0:
+ desc_sw->async_tx.tx_submit = ioat2_tx_submit;
+ break;
+ }
INIT_LIST_HEAD(&desc_sw->async_tx.tx_list);
+
desc_sw->hw = desc;
desc_sw->async_tx.phys = phys;
return desc_sw;
}
-/* returns the actual number of allocated descriptors */
+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_chan: the channel to be massaged
+ */
+static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat_chan)
+{
+ struct ioat_desc_sw *desc, *_desc;
+
+ /* setup used_desc */
+ ioat_chan->used_desc.next = ioat_chan->free_desc.next;
+ ioat_chan->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_chan->free_desc.prev->next = ioat_chan->free_desc.next;
+ ioat_chan->free_desc.next->prev = ioat_chan->free_desc.prev;
+
+ /* circle link the hw descriptors */
+ desc = to_ioat_desc(ioat_chan->free_desc.next);
+ desc->hw->next = to_ioat_desc(desc->node.next)->async_tx.phys;
+ list_for_each_entry_safe(desc, _desc, ioat_chan->free_desc.next, node) {
+ desc->hw->next = to_ioat_desc(desc->node.next)->async_tx.phys;
+ }
+}
+
+/**
+ * ioat_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 *chan)
{
struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
- struct ioat_desc_sw *desc = NULL;
+ struct ioat_desc_sw *desc;
u16 chanctrl;
u32 chanerr;
int i;
/* have we already been set up? */
if (!list_empty(&ioat_chan->free_desc))
- return INITIAL_IOAT_DESC_COUNT;
+ return ioat_chan->desccount;
/* Setup register to interrupt and write completion status on error */
chanctrl = IOAT_CHANCTRL_ERR_INT_EN |
chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
if (chanerr) {
dev_err(&ioat_chan->device->pdev->dev,
- "ioatdma: CHANERR = %x, clearing\n", chanerr);
+ "CHANERR = %x, clearing\n", chanerr);
writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
}
/* Allocate descriptors */
- for (i = 0; i < INITIAL_IOAT_DESC_COUNT; i++) {
+ for (i = 0; i < ioat_initial_desc_count; i++) {
desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_KERNEL);
if (!desc) {
dev_err(&ioat_chan->device->pdev->dev,
- "ioatdma: Only %d initial descriptors\n", i);
+ "Only %d initial descriptors\n", i);
break;
}
list_add_tail(&desc->node, &tmp_list);
}
spin_lock_bh(&ioat_chan->desc_lock);
+ ioat_chan->desccount = i;
list_splice(&tmp_list, &ioat_chan->free_desc);
+ if (ioat_chan->device->version != IOAT_VER_1_2)
+ ioat2_dma_massage_chan_desc(ioat_chan);
spin_unlock_bh(&ioat_chan->desc_lock);
/* allocate a completion writeback area */
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
tasklet_enable(&ioat_chan->cleanup_task);
- ioat_dma_start_null_desc(ioat_chan);
- return i;
+ ioat_dma_start_null_desc(ioat_chan); /* give chain to dma device */
+ return ioat_chan->desccount;
}
+/**
+ * ioat_dma_free_chan_resources - release all the descriptors
+ * @chan: the channel to be cleaned
+ */
static void ioat_dma_free_chan_resources(struct dma_chan *chan)
{
struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
/* Delay 100ms after reset to allow internal DMA logic to quiesce
* before removing DMA descriptor resources.
*/
- writeb(IOAT_CHANCMD_RESET, ioat_chan->reg_base + IOAT_CHANCMD_OFFSET);
+ writeb(IOAT_CHANCMD_RESET,
+ ioat_chan->reg_base
+ + IOAT_CHANCMD_OFFSET(ioat_chan->device->version));
mdelay(100);
spin_lock_bh(&ioat_chan->desc_lock);
- list_for_each_entry_safe(desc, _desc, &ioat_chan->used_desc, node) {
- in_use_descs++;
- list_del(&desc->node);
- pci_pool_free(ioatdma_device->dma_pool, desc->hw,
- desc->async_tx.phys);
- kfree(desc);
- }
- list_for_each_entry_safe(desc, _desc, &ioat_chan->free_desc, node) {
- list_del(&desc->node);
+ switch (ioat_chan->device->version) {
+ case IOAT_VER_1_2:
+ list_for_each_entry_safe(desc, _desc,
+ &ioat_chan->used_desc, node) {
+ in_use_descs++;
+ list_del(&desc->node);
+ pci_pool_free(ioatdma_device->dma_pool, desc->hw,
+ desc->async_tx.phys);
+ kfree(desc);
+ }
+ list_for_each_entry_safe(desc, _desc,
+ &ioat_chan->free_desc, node) {
+ list_del(&desc->node);
+ pci_pool_free(ioatdma_device->dma_pool, desc->hw,
+ desc->async_tx.phys);
+ kfree(desc);
+ }
+ break;
+ case IOAT_VER_2_0:
+ list_for_each_entry_safe(desc, _desc,
+ ioat_chan->free_desc.next, node) {
+ list_del(&desc->node);
+ pci_pool_free(ioatdma_device->dma_pool, desc->hw,
+ desc->async_tx.phys);
+ kfree(desc);
+ }
+ desc = to_ioat_desc(ioat_chan->free_desc.next);
pci_pool_free(ioatdma_device->dma_pool, desc->hw,
desc->async_tx.phys);
kfree(desc);
+ INIT_LIST_HEAD(&ioat_chan->free_desc);
+ INIT_LIST_HEAD(&ioat_chan->used_desc);
+ break;
}
spin_unlock_bh(&ioat_chan->desc_lock);
/* one is ok since we left it on there on purpose */
if (in_use_descs > 1)
dev_err(&ioat_chan->device->pdev->dev,
- "ioatdma: Freeing %d in use descriptors!\n",
+ "Freeing %d in use descriptors!\n",
in_use_descs - 1);
ioat_chan->last_completion = ioat_chan->completion_addr = 0;
ioat_chan->pending = 0;
+ ioat_chan->dmacount = 0;
}
+
/**
* ioat_dma_get_next_descriptor - return the next available descriptor
* @ioat_chan: IOAT DMA channel handle
* channel's desc_lock held. Allocates more descriptors if the channel
* has run out.
*/
-static struct ioat_desc_sw *ioat_dma_get_next_descriptor(
- struct ioat_dma_chan *ioat_chan)
+static struct ioat_desc_sw *
+ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan)
{
- struct ioat_desc_sw *new = NULL;
+ struct ioat_desc_sw *new;
if (!list_empty(&ioat_chan->free_desc)) {
new = to_ioat_desc(ioat_chan->free_desc.next);
} else {
/* try to get another desc */
new = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC);
- /* will this ever happen? */
- /* TODO add upper limit on these */
- BUG_ON(!new);
+ if (!new) {
+ dev_err(&ioat_chan->device->pdev->dev,
+ "alloc failed\n");
+ return NULL;
+ }
}
prefetch(new->hw);
return new;
}
-static struct dma_async_tx_descriptor *ioat_dma_prep_memcpy(
- struct dma_chan *chan,
- size_t len,
- int int_en)
+static struct ioat_desc_sw *
+ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan)
{
- struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
- struct ioat_desc_sw *first, *prev, *new;
- LIST_HEAD(new_chain);
- u32 copy;
- size_t orig_len;
- int desc_count = 0;
+ struct ioat_desc_sw *new;
- if (!len)
- return NULL;
+ /*
+ * 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_chan->used_desc.prev &&
+ ioat_chan->used_desc.next == ioat_chan->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_chan->used_desc.next);
+ noop_desc->hw->size = 0;
+ noop_desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL;
+ noop_desc->hw->src_addr = 0;
+ noop_desc->hw->dst_addr = 0;
+
+ ioat_chan->used_desc.next = ioat_chan->used_desc.next->next;
+ ioat_chan->pending++;
+ ioat_chan->dmacount++;
+
+ /* try to get a few more descriptors */
+ for (i = 16; i; i--) {
+ desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC);
+ if (!desc) {
+ dev_err(&ioat_chan->device->pdev->dev,
+ "alloc failed\n");
+ break;
+ }
+ list_add_tail(&desc->node, ioat_chan->used_desc.next);
- orig_len = len;
+ desc->hw->next
+ = to_ioat_desc(desc->node.next)->async_tx.phys;
+ to_ioat_desc(desc->node.prev)->hw->next
+ = desc->async_tx.phys;
+ ioat_chan->desccount++;
+ }
- first = NULL;
- prev = NULL;
+ ioat_chan->used_desc.next = noop_desc->node.next;
+ }
+ new = to_ioat_desc(ioat_chan->used_desc.next);
+ prefetch(new);
+ ioat_chan->used_desc.next = new->node.next;
- spin_lock_bh(&ioat_chan->desc_lock);
- while (len) {
- new = ioat_dma_get_next_descriptor(ioat_chan);
- copy = min((u32) len, ioat_chan->xfercap);
+ if (ioat_chan->used_desc.prev == NULL)
+ ioat_chan->used_desc.prev = &new->node;
- new->hw->size = copy;
- new->hw->ctl = 0;
- new->async_tx.cookie = 0;
- new->async_tx.ack = 1;
+ prefetch(new->hw);
+ return new;
+}
- /* chain together the physical address list for the HW */
- if (!first)
- first = new;
- else
- prev->hw->next = (u64) new->async_tx.phys;
+static struct ioat_desc_sw *ioat_dma_get_next_descriptor(
+ struct ioat_dma_chan *ioat_chan)
+{
+ if (!ioat_chan)
+ return NULL;
- prev = new;
- len -= copy;
- list_add_tail(&new->node, &new_chain);
- desc_count++;
+ switch (ioat_chan->device->version) {
+ case IOAT_VER_1_2:
+ return ioat1_dma_get_next_descriptor(ioat_chan);
+ break;
+ case IOAT_VER_2_0:
+ return ioat2_dma_get_next_descriptor(ioat_chan);
+ break;
}
+ return NULL;
+}
- list_splice(&new_chain, &new->async_tx.tx_list);
-
- new->hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
- new->hw->next = 0;
- new->tx_cnt = desc_count;
- new->async_tx.ack = 0; /* client is in control of this ack */
- new->async_tx.cookie = -EBUSY;
+static struct dma_async_tx_descriptor *ioat1_dma_prep_memcpy(
+ struct dma_chan *chan,
+ dma_addr_t dma_dest,
+ dma_addr_t dma_src,
+ size_t len,
+ unsigned long flags)
+{
+ struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+ struct ioat_desc_sw *new;
- pci_unmap_len_set(new, len, orig_len);
+ spin_lock_bh(&ioat_chan->desc_lock);
+ new = ioat_dma_get_next_descriptor(ioat_chan);
spin_unlock_bh(&ioat_chan->desc_lock);
- return new ? &new->async_tx : NULL;
+ if (new) {
+ new->len = len;
+ new->dst = dma_dest;
+ new->src = dma_src;
+ new->async_tx.flags = flags;
+ return &new->async_tx;
+ } else
+ return NULL;
}
-/**
- * ioat_dma_memcpy_issue_pending - push potentially unrecognized appended
- * descriptors to hw
- * @chan: DMA channel handle
- */
-static void ioat_dma_memcpy_issue_pending(struct dma_chan *chan)
+static struct dma_async_tx_descriptor *ioat2_dma_prep_memcpy(
+ struct dma_chan *chan,
+ dma_addr_t dma_dest,
+ dma_addr_t dma_src,
+ size_t len,
+ unsigned long flags)
{
struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+ struct ioat_desc_sw *new;
- if (ioat_chan->pending != 0) {
- ioat_chan->pending = 0;
- writeb(IOAT_CHANCMD_APPEND,
- ioat_chan->reg_base + IOAT_CHANCMD_OFFSET);
- }
+ spin_lock_bh(&ioat_chan->desc_lock);
+ new = ioat2_dma_get_next_descriptor(ioat_chan);
+
+ /*
+ * leave ioat_chan->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->async_tx.flags = flags;
+ return &new->async_tx;
+ } else
+ return NULL;
}
static void ioat_dma_cleanup_tasklet(unsigned long data)
chan->reg_base + IOAT_CHANCTRL_OFFSET);
}
+/**
+ * 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_chan)
{
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;
prefetch(ioat_chan->completion_virt);
- if (!spin_trylock(&ioat_chan->cleanup_lock))
+ if (!spin_trylock_bh(&ioat_chan->cleanup_lock))
return;
/* The completion writeback can happen at any time,
#if (BITS_PER_LONG == 64)
phys_complete =
- ioat_chan->completion_virt->full & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
+ ioat_chan->completion_virt->full
+ & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
#else
- phys_complete = ioat_chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK;
+ phys_complete =
+ ioat_chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK;
#endif
- if ((ioat_chan->completion_virt->full & IOAT_CHANSTS_DMA_TRANSFER_STATUS) ==
+ if ((ioat_chan->completion_virt->full
+ & IOAT_CHANSTS_DMA_TRANSFER_STATUS) ==
IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) {
dev_err(&ioat_chan->device->pdev->dev,
- "ioatdma: Channel halted, chanerr = %x\n",
+ "Channel halted, chanerr = %x\n",
readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET));
/* TODO do something to salvage the situation */
}
if (phys_complete == ioat_chan->last_completion) {
- spin_unlock(&ioat_chan->cleanup_lock);
+ spin_unlock_bh(&ioat_chan->cleanup_lock);
return;
}
cookie = 0;
spin_lock_bh(&ioat_chan->desc_lock);
- list_for_each_entry_safe(desc, _desc, &ioat_chan->used_desc, node) {
-
- /*
- * 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 (desc->async_tx.cookie) {
- cookie = desc->async_tx.cookie;
+ switch (ioat_chan->device->version) {
+ case IOAT_VER_1_2:
+ list_for_each_entry_safe(desc, _desc,
+ &ioat_chan->used_desc, node) {
/*
- * yes we are unmapping both _page and _single alloc'd
- * regions with unmap_page. Is this *really* that bad?
+ * 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.
*/
- pci_unmap_page(ioat_chan->device->pdev,
- pci_unmap_addr(desc, dst),
- pci_unmap_len(desc, len),
- PCI_DMA_FROMDEVICE);
- pci_unmap_page(ioat_chan->device->pdev,
- pci_unmap_addr(desc, src),
- pci_unmap_len(desc, len),
- PCI_DMA_TODEVICE);
- }
+ if (desc->async_tx.cookie) {
+ cookie = desc->async_tx.cookie;
+
+ /*
+ * yes we are unmapping both _page and _single
+ * alloc'd regions with unmap_page. Is this
+ * *really* that bad?
+ */
+ pci_unmap_page(ioat_chan->device->pdev,
+ pci_unmap_addr(desc, dst),
+ pci_unmap_len(desc, len),
+ PCI_DMA_FROMDEVICE);
+ pci_unmap_page(ioat_chan->device->pdev,
+ pci_unmap_addr(desc, src),
+ pci_unmap_len(desc, len),
+ PCI_DMA_TODEVICE);
+
+ if (desc->async_tx.callback) {
+ desc->async_tx.callback(desc->async_tx.callback_param);
+ desc->async_tx.callback = NULL;
+ }
+ }
- if (desc->async_tx.phys != phys_complete) {
- /*
- * a completed entry, but not the last, so cleanup
- * if the client is done with the descriptor
- */
- if (desc->async_tx.ack) {
- list_del(&desc->node);
- list_add_tail(&desc->node,
- &ioat_chan->free_desc);
- } else
+ if (desc->async_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(&desc->async_tx)) {
+ list_del(&desc->node);
+ list_add_tail(&desc->node,
+ &ioat_chan->free_desc);
+ } else
+ desc->async_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
+ */
desc->async_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
- */
- desc->async_tx.cookie = 0;
- /* TODO check status bits? */
+ /* TODO check status bits? */
+ break;
+ }
+ }
+ break;
+ case IOAT_VER_2_0:
+ /* has some other thread has already cleaned up? */
+ if (ioat_chan->used_desc.prev == NULL)
break;
+
+ /* work backwards to find latest finished desc */
+ desc = to_ioat_desc(ioat_chan->used_desc.next);
+ latest_desc = NULL;
+ do {
+ desc = to_ioat_desc(desc->node.prev);
+ desc_phys = (unsigned long)desc->async_tx.phys
+ & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
+ if (desc_phys == phys_complete) {
+ latest_desc = desc;
+ break;
+ }
+ } while (&desc->node != ioat_chan->used_desc.prev);
+
+ if (latest_desc != NULL) {
+
+ /* work forwards to clear finished descriptors */
+ for (desc = to_ioat_desc(ioat_chan->used_desc.prev);
+ &desc->node != latest_desc->node.next &&
+ &desc->node != ioat_chan->used_desc.next;
+ desc = to_ioat_desc(desc->node.next)) {
+ if (desc->async_tx.cookie) {
+ cookie = desc->async_tx.cookie;
+ desc->async_tx.cookie = 0;
+
+ pci_unmap_page(ioat_chan->device->pdev,
+ pci_unmap_addr(desc, dst),
+ pci_unmap_len(desc, len),
+ PCI_DMA_FROMDEVICE);
+ pci_unmap_page(ioat_chan->device->pdev,
+ pci_unmap_addr(desc, src),
+ pci_unmap_len(desc, len),
+ PCI_DMA_TODEVICE);
+
+ if (desc->async_tx.callback) {
+ desc->async_tx.callback(desc->async_tx.callback_param);
+ desc->async_tx.callback = NULL;
+ }
+ }
+ }
+
+ /* move used.prev up beyond those that are finished */
+ if (&desc->node == ioat_chan->used_desc.next)
+ ioat_chan->used_desc.prev = NULL;
+ else
+ ioat_chan->used_desc.prev = &desc->node;
}
+ break;
}
spin_unlock_bh(&ioat_chan->desc_lock);
if (cookie != 0)
ioat_chan->completed_cookie = cookie;
- spin_unlock(&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);
+ spin_unlock_bh(&ioat_chan->cleanup_lock);
}
/**
return dma_async_is_complete(cookie, last_complete, last_used);
}
-/* PCI API */
-
static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan)
{
struct ioat_desc_sw *desc;
spin_lock_bh(&ioat_chan->desc_lock);
desc = ioat_dma_get_next_descriptor(ioat_chan);
- desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL;
- desc->hw->next = 0;
- desc->async_tx.ack = 1;
-
- list_add_tail(&desc->node, &ioat_chan->used_desc);
+ desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL
+ | IOAT_DMA_DESCRIPTOR_CTL_INT_GN
+ | IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
+ desc->hw->size = 0;
+ desc->hw->src_addr = 0;
+ desc->hw->dst_addr = 0;
+ async_tx_ack(&desc->async_tx);
+ switch (ioat_chan->device->version) {
+ case IOAT_VER_1_2:
+ desc->hw->next = 0;
+ list_add_tail(&desc->node, &ioat_chan->used_desc);
+
+ writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF,
+ ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW);
+ writel(((u64) desc->async_tx.phys) >> 32,
+ ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH);
+
+ writeb(IOAT_CHANCMD_START, ioat_chan->reg_base
+ + IOAT_CHANCMD_OFFSET(ioat_chan->device->version));
+ break;
+ case IOAT_VER_2_0:
+ writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF,
+ ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW);
+ writel(((u64) desc->async_tx.phys) >> 32,
+ ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH);
+
+ ioat_chan->dmacount++;
+ __ioat2_dma_memcpy_issue_pending(ioat_chan);
+ break;
+ }
spin_unlock_bh(&ioat_chan->desc_lock);
-
- writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF,
- ioat_chan->reg_base + IOAT_CHAINADDR_OFFSET_LOW);
- writel(((u64) desc->async_tx.phys) >> 32,
- ioat_chan->reg_base + IOAT_CHAINADDR_OFFSET_HIGH);
-
- writeb(IOAT_CHANCMD_START, ioat_chan->reg_base + IOAT_CHANCMD_OFFSET);
}
/*
*/
#define IOAT_TEST_SIZE 2000
+static void ioat_dma_test_callback(void *dma_async_param)
+{
+ printk(KERN_ERR "ioatdma: ioat_dma_test_callback(%p)\n",
+ dma_async_param);
+}
+
/**
* ioat_dma_self_test - Perform a IOAT transaction to verify the HW works.
* @device: device to be tested
u8 *dest;
struct dma_chan *dma_chan;
struct dma_async_tx_descriptor *tx;
- dma_addr_t addr;
+ dma_addr_t dma_dest, dma_src;
dma_cookie_t cookie;
int err = 0;
dma_chan = container_of(device->common.channels.next,
struct dma_chan,
device_node);
- if (ioat_dma_alloc_chan_resources(dma_chan) < 1) {
+ if (device->common.device_alloc_chan_resources(dma_chan) < 1) {
dev_err(&device->pdev->dev,
"selftest cannot allocate chan resource\n");
err = -ENODEV;
goto out;
}
- tx = ioat_dma_prep_memcpy(dma_chan, IOAT_TEST_SIZE, 0);
+ dma_src = dma_map_single(dma_chan->device->dev, src, IOAT_TEST_SIZE,
+ DMA_TO_DEVICE);
+ dma_dest = dma_map_single(dma_chan->device->dev, dest, IOAT_TEST_SIZE,
+ DMA_FROM_DEVICE);
+ tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src,
+ IOAT_TEST_SIZE, 0);
+ if (!tx) {
+ dev_err(&device->pdev->dev,
+ "Self-test prep failed, disabling\n");
+ err = -ENODEV;
+ goto free_resources;
+ }
+
async_tx_ack(tx);
- addr = dma_map_single(dma_chan->device->dev, src, IOAT_TEST_SIZE,
- DMA_TO_DEVICE);
- ioat_set_src(addr, tx, 0);
- addr = dma_map_single(dma_chan->device->dev, dest, IOAT_TEST_SIZE,
- DMA_FROM_DEVICE);
- ioat_set_dest(addr, tx, 0);
- cookie = ioat_tx_submit(tx);
- ioat_dma_memcpy_issue_pending(dma_chan);
+ tx->callback = ioat_dma_test_callback;
+ tx->callback_param = (void *)0x8086;
+ cookie = tx->tx_submit(tx);
+ if (cookie < 0) {
+ dev_err(&device->pdev->dev,
+ "Self-test setup failed, disabling\n");
+ err = -ENODEV;
+ goto free_resources;
+ }
+ device->common.device_issue_pending(dma_chan);
msleep(1);
- if (ioat_dma_is_complete(dma_chan, cookie, NULL, NULL) != DMA_SUCCESS) {
+ if (device->common.device_is_tx_complete(dma_chan, cookie, NULL, NULL)
+ != DMA_SUCCESS) {
dev_err(&device->pdev->dev,
- "ioatdma: Self-test copy timed out, disabling\n");
+ "Self-test copy timed out, disabling\n");
err = -ENODEV;
goto free_resources;
}
if (memcmp(src, dest, IOAT_TEST_SIZE)) {
dev_err(&device->pdev->dev,
- "ioatdma: Self-test copy failed compare, disabling\n");
+ "Self-test copy failed compare, disabling\n");
err = -ENODEV;
goto free_resources;
}
free_resources:
- ioat_dma_free_chan_resources(dma_chan);
+ device->common.device_free_chan_resources(dma_chan);
out:
kfree(src);
kfree(dest);
goto msi;
if (!strcmp(ioat_interrupt_style, "intx"))
goto intx;
+ dev_err(&device->pdev->dev, "invalid ioat_interrupt_style %s\n",
+ ioat_interrupt_style);
+ goto err_no_irq;
msix:
/* The number of MSI-X vectors should equal the number of channels */
INIT_LIST_HEAD(&device->common.channels);
ioat_dma_enumerate_channels(device);
- dma_cap_set(DMA_MEMCPY, device->common.cap_mask);
device->common.device_alloc_chan_resources =
ioat_dma_alloc_chan_resources;
device->common.device_free_chan_resources =
ioat_dma_free_chan_resources;
- device->common.device_prep_dma_memcpy = ioat_dma_prep_memcpy;
- device->common.device_is_tx_complete = ioat_dma_is_complete;
- device->common.device_issue_pending = ioat_dma_memcpy_issue_pending;
- device->common.device_dependency_added = ioat_dma_dependency_added;
device->common.dev = &pdev->dev;
+
+ dma_cap_set(DMA_MEMCPY, device->common.cap_mask);
+ device->common.device_is_tx_complete = ioat_dma_is_complete;
+ switch (device->version) {
+ case IOAT_VER_1_2:
+ device->common.device_prep_dma_memcpy = ioat1_dma_prep_memcpy;
+ device->common.device_issue_pending =
+ ioat1_dma_memcpy_issue_pending;
+ break;
+ case IOAT_VER_2_0:
+ device->common.device_prep_dma_memcpy = ioat2_dma_prep_memcpy;
+ device->common.device_issue_pending =
+ ioat2_dma_memcpy_issue_pending;
+ break;
+ }
+
dev_err(&device->pdev->dev,
- "ioatdma: Intel(R) I/OAT DMA Engine found,"
- " %d channels, device version 0x%02x\n",
- device->common.chancnt, device->version);
+ "Intel(R) I/OAT DMA Engine found,"
+ " %d channels, device version 0x%02x, driver version %s\n",
+ device->common.chancnt, device->version, IOAT_DMA_VERSION);
err = ioat_dma_setup_interrupts(device);
if (err)
err_dma_pool:
kfree(device);
err_kzalloc:
- iounmap(iobase);
- dev_err(&device->pdev->dev,
- "ioatdma: Intel(R) I/OAT DMA Engine initialization failed\n");
+ dev_err(&pdev->dev,
+ "Intel(R) I/OAT DMA Engine initialization failed\n");
return NULL;
}
struct dma_chan *chan, *_chan;
struct ioat_dma_chan *ioat_chan;
- dma_async_device_unregister(&device->common);
-
ioat_dma_remove_interrupts(device);
+ dma_async_device_unregister(&device->common);
+
pci_pool_destroy(device->dma_pool);
pci_pool_destroy(device->completion_pool);
+ iounmap(device->reg_base);
+ pci_release_regions(device->pdev);
+ pci_disable_device(device->pdev);
+
list_for_each_entry_safe(chan, _chan,
&device->common.channels, device_node) {
ioat_chan = to_ioat_chan(chan);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff