[PATCH 01/12] dmaengine: add base support for the async_tx api
From: Dan Williams
Date: Thu Nov 30 2006 - 15:10:59 EST
From: Dan Williams <dan.j.williams@xxxxxxxxx>
* introduce struct dma_async_tx_descriptor as a common field for all dmaengine
software descriptors
* convert the device_memcpy_* methods into separate prep, set src/dest, and
submit stages
* support capabilities beyond memcpy (xor, memset, xor zero sum, completion
interrupts)
* convert ioatdma to the new semantics
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
drivers/dma/dmaengine.c | 44 ++++++--
drivers/dma/ioatdma.c | 256 ++++++++++++++++++++++----------------------
drivers/dma/ioatdma.h | 8 +
include/linux/dmaengine.h | 263 ++++++++++++++++++++++++++++++++++++++-------
4 files changed, 394 insertions(+), 177 deletions(-)
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 1527804..8d203ad 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -210,7 +210,8 @@ static void dma_chans_rebalance(void)
mutex_lock(&dma_list_mutex);
list_for_each_entry(client, &dma_client_list, global_node) {
- while (client->chans_desired > client->chan_count) {
+ while (client->chans_desired < 0 ||
+ client->chans_desired > client->chan_count) {
chan = dma_client_chan_alloc(client);
if (!chan)
break;
@@ -219,7 +220,8 @@ static void dma_chans_rebalance(void)
chan,
DMA_RESOURCE_ADDED);
}
- while (client->chans_desired < client->chan_count) {
+ while (client->chans_desired >= 0 &&
+ client->chans_desired < client->chan_count) {
spin_lock_irqsave(&client->lock, flags);
chan = list_entry(client->channels.next,
struct dma_chan,
@@ -294,12 +296,12 @@ void dma_async_client_unregister(struct
* @number: count of DMA channels requested
*
* Clients call dma_async_client_chan_request() to specify how many
- * DMA channels they need, 0 to free all currently allocated.
+ * DMA channels they need, 0 to free all currently allocated. A request
+ * < 0 indicates the client wants to handle all engines in the system.
* The resulting allocations/frees are indicated to the client via the
* event callback.
*/
-void dma_async_client_chan_request(struct dma_client *client,
- unsigned int number)
+void dma_async_client_chan_request(struct dma_client *client, int number)
{
client->chans_desired = number;
dma_chans_rebalance();
@@ -318,6 +320,31 @@ int dma_async_device_register(struct dma
if (!device)
return -ENODEV;
+ /* validate device routines */
+ BUG_ON(test_bit(DMA_MEMCPY, &device->capabilities) &&
+ !device->device_prep_dma_memcpy);
+ BUG_ON(test_bit(DMA_XOR, &device->capabilities) &&
+ !device->device_prep_dma_xor);
+ BUG_ON(test_bit(DMA_ZERO_SUM, &device->capabilities) &&
+ !device->device_prep_dma_zero_sum);
+ BUG_ON(test_bit(DMA_MEMSET, &device->capabilities) &&
+ !device->device_prep_dma_memset);
+ BUG_ON(test_bit(DMA_ZERO_SUM, &device->capabilities) &&
+ !device->device_prep_dma_interrupt);
+
+ BUG_ON(!device->device_alloc_chan_resources);
+ BUG_ON(!device->device_free_chan_resources);
+ BUG_ON(!device->device_tx_submit);
+ BUG_ON(!device->device_set_dest);
+ BUG_ON(!device->device_set_src);
+ BUG_ON(!device->device_dependency_added);
+ BUG_ON(!device->device_is_tx_complete);
+ BUG_ON(!device->map_page);
+ BUG_ON(!device->map_single);
+ BUG_ON(!device->unmap_page);
+ BUG_ON(!device->unmap_single);
+ BUG_ON(!device->device_issue_pending);
+
init_completion(&device->done);
kref_init(&device->refcount);
device->dev_id = id++;
@@ -402,11 +429,8 @@ subsys_initcall(dma_bus_init);
EXPORT_SYMBOL(dma_async_client_register);
EXPORT_SYMBOL(dma_async_client_unregister);
EXPORT_SYMBOL(dma_async_client_chan_request);
-EXPORT_SYMBOL(dma_async_memcpy_buf_to_buf);
-EXPORT_SYMBOL(dma_async_memcpy_buf_to_pg);
-EXPORT_SYMBOL(dma_async_memcpy_pg_to_pg);
-EXPORT_SYMBOL(dma_async_memcpy_complete);
-EXPORT_SYMBOL(dma_async_memcpy_issue_pending);
+EXPORT_SYMBOL(dma_async_is_tx_complete);
+EXPORT_SYMBOL(dma_async_issue_pending);
EXPORT_SYMBOL(dma_async_device_register);
EXPORT_SYMBOL(dma_async_device_unregister);
EXPORT_SYMBOL(dma_chan_cleanup);
diff --git a/drivers/dma/ioatdma.c b/drivers/dma/ioatdma.c
index 0358419..ff7377d 100644
--- a/drivers/dma/ioatdma.c
+++ b/drivers/dma/ioatdma.c
@@ -31,6 +31,7 @@ #include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
+#include <linux/async_tx.h>
#include "ioatdma.h"
#include "ioatdma_io.h"
#include "ioatdma_registers.h"
@@ -39,6 +40,7 @@ #include "ioatdma_hw.h"
#define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common)
#define to_ioat_device(dev) container_of(dev, struct ioat_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)
/* internal functions */
static int __devinit ioat_probe(struct pci_dev *pdev, const struct pci_device_id *ent);
@@ -99,6 +101,8 @@ static struct ioat_desc_sw *ioat_dma_all
}
memset(desc, 0, sizeof(*desc));
+ dma_async_tx_descriptor_init(&desc_sw->async_tx, &ioat_chan->common);
+ INIT_LIST_HEAD(&desc_sw->group_list);
desc_sw->hw = desc;
desc_sw->phys = phys;
@@ -215,45 +219,25 @@ static void ioat_dma_free_chan_resources
ioatdma_chan_write16(ioat_chan, IOAT_CHANCTRL_OFFSET, chanctrl);
}
-/**
- * do_ioat_dma_memcpy - actual function that initiates a IOAT DMA transaction
- * @ioat_chan: IOAT DMA channel handle
- * @dest: DMA destination address
- * @src: DMA source address
- * @len: transaction length in bytes
- */
-
-static dma_cookie_t do_ioat_dma_memcpy(struct ioat_dma_chan *ioat_chan,
- dma_addr_t dest,
- dma_addr_t src,
- size_t len)
+static struct dma_async_tx_descriptor *
+ioat_dma_prep_memcpy(struct dma_chan *chan, size_t len, int int_en)
{
- struct ioat_desc_sw *first;
- struct ioat_desc_sw *prev;
- struct ioat_desc_sw *new;
- dma_cookie_t cookie;
+ 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;
- dma_addr_t orig_src, orig_dst;
- unsigned int desc_count = 0;
- unsigned int append = 0;
-
- if (!ioat_chan || !dest || !src)
- return -EFAULT;
+ int desc_count = 0;
if (!len)
- return ioat_chan->common.cookie;
+ return NULL;
orig_len = len;
- orig_src = src;
- orig_dst = dest;
first = NULL;
prev = NULL;
spin_lock_bh(&ioat_chan->desc_lock);
-
while (len) {
if (!list_empty(&ioat_chan->free_desc)) {
new = to_ioat_desc(ioat_chan->free_desc.next);
@@ -270,9 +254,8 @@ static dma_cookie_t do_ioat_dma_memcpy(s
new->hw->size = copy;
new->hw->ctl = 0;
- new->hw->src_addr = src;
- new->hw->dst_addr = dest;
- new->cookie = 0;
+ new->async_tx.cookie = 0;
+ new->async_tx.ack = 1;
/* chain together the physical address list for the HW */
if (!first)
@@ -281,40 +264,83 @@ static dma_cookie_t do_ioat_dma_memcpy(s
prev->hw->next = (u64) new->phys;
prev = new;
-
len -= copy;
- dest += copy;
- src += copy;
-
list_add_tail(&new->node, &new_chain);
desc_count++;
}
+
+ list_splice(&new_chain, &new->group_list);
+
new->hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS;
new->hw->next = 0;
+ new->group_count = desc_count;
+ new->async_tx.ack = 0; /* client is in control of this ack */
+ new->async_tx.cookie = -EBUSY;
+ new->async_tx.type = DMA_MEMCPY;
- /* cookie incr and addition to used_list must be atomic */
+ pci_unmap_len_set(new, src_len, orig_len);
+ pci_unmap_len_set(new, dst_len, orig_len);
+ spin_unlock_bh(&ioat_chan->desc_lock);
+
+ return new ? &new->async_tx : NULL;
+}
+
+static void
+ioat_set_src(dma_addr_t addr, struct dma_async_tx_descriptor *tx, int index)
+{
+ struct ioat_desc_sw *iter, *desc = tx_to_ioat_desc(tx);
+ struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan);
+
+ pci_unmap_addr_set(desc, src, addr);
+
+ list_for_each_entry(iter, &desc->group_list, node) {
+ iter->hw->src_addr = addr;
+ addr += ioat_chan->xfercap;
+ }
+
+}
+
+static void
+ioat_set_dest(dma_addr_t addr, struct dma_async_tx_descriptor *tx, int index)
+{
+ struct ioat_desc_sw *iter, *desc = tx_to_ioat_desc(tx);
+ struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan);
+
+ pci_unmap_addr_set(desc, dst, addr);
+
+ list_for_each_entry(iter, &desc->group_list, node) {
+ iter->hw->dst_addr = addr;
+ addr += ioat_chan->xfercap;
+ }
+}
+
+static dma_cookie_t
+ioat_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);
+ struct ioat_desc_sw *group_start = list_entry(desc->group_list.next,
+ struct ioat_desc_sw, node);
+ int append = 0;
+ dma_cookie_t cookie;
+ spin_lock_bh(&ioat_chan->desc_lock);
+ /* 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->cookie = cookie;
-
- pci_unmap_addr_set(new, src, orig_src);
- pci_unmap_addr_set(new, dst, orig_dst);
- pci_unmap_len_set(new, src_len, orig_len);
- pci_unmap_len_set(new, dst_len, orig_len);
+ ioat_chan->common.cookie = desc->async_tx.cookie = cookie;
/* write address into NextDescriptor field of last desc in chain */
- to_ioat_desc(ioat_chan->used_desc.prev)->hw->next = first->phys;
- list_splice_init(&new_chain, ioat_chan->used_desc.prev);
+ to_ioat_desc(ioat_chan->used_desc.prev)->hw->next = group_start->phys;
+ list_splice_init(&desc->group_list, ioat_chan->used_desc.prev);
- ioat_chan->pending += desc_count;
+ ioat_chan->pending += desc->group_count;
if (ioat_chan->pending >= 20) {
append = 1;
ioat_chan->pending = 0;
}
-
spin_unlock_bh(&ioat_chan->desc_lock);
if (append)
@@ -324,86 +350,35 @@ static dma_cookie_t do_ioat_dma_memcpy(s
return cookie;
}
-/**
- * ioat_dma_memcpy_buf_to_buf - wrapper that takes src & dest bufs
- * @chan: IOAT DMA channel handle
- * @dest: DMA destination address
- * @src: DMA source address
- * @len: transaction length in bytes
- */
-
-static dma_cookie_t ioat_dma_memcpy_buf_to_buf(struct dma_chan *chan,
- void *dest,
- void *src,
- size_t len)
+static dma_addr_t ioat_map_page(struct dma_chan *chan, struct page *page,
+ unsigned long offset, size_t size,
+ int direction)
{
- dma_addr_t dest_addr;
- dma_addr_t src_addr;
struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
-
- dest_addr = pci_map_single(ioat_chan->device->pdev,
- dest, len, PCI_DMA_FROMDEVICE);
- src_addr = pci_map_single(ioat_chan->device->pdev,
- src, len, PCI_DMA_TODEVICE);
-
- return do_ioat_dma_memcpy(ioat_chan, dest_addr, src_addr, len);
+ return pci_map_page(ioat_chan->device->pdev, page, offset, size,
+ direction);
}
-/**
- * ioat_dma_memcpy_buf_to_pg - wrapper, copying from a buf to a page
- * @chan: IOAT DMA channel handle
- * @page: pointer to the page to copy to
- * @offset: offset into that page
- * @src: DMA source address
- * @len: transaction length in bytes
- */
-
-static dma_cookie_t ioat_dma_memcpy_buf_to_pg(struct dma_chan *chan,
- struct page *page,
- unsigned int offset,
- void *src,
- size_t len)
+static dma_addr_t ioat_map_single(struct dma_chan *chan, void *cpu_addr,
+ size_t size, int direction)
{
- dma_addr_t dest_addr;
- dma_addr_t src_addr;
struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
-
- dest_addr = pci_map_page(ioat_chan->device->pdev,
- page, offset, len, PCI_DMA_FROMDEVICE);
- src_addr = pci_map_single(ioat_chan->device->pdev,
- src, len, PCI_DMA_TODEVICE);
-
- return do_ioat_dma_memcpy(ioat_chan, dest_addr, src_addr, len);
+ return pci_map_single(ioat_chan->device->pdev, cpu_addr, size,
+ direction);
}
-/**
- * ioat_dma_memcpy_pg_to_pg - wrapper, copying between two pages
- * @chan: IOAT DMA channel handle
- * @dest_pg: pointer to the page to copy to
- * @dest_off: offset into that page
- * @src_pg: pointer to the page to copy from
- * @src_off: offset into that page
- * @len: transaction length in bytes. This is guaranteed not to make a copy
- * across a page boundary.
- */
-
-static dma_cookie_t ioat_dma_memcpy_pg_to_pg(struct dma_chan *chan,
- struct page *dest_pg,
- unsigned int dest_off,
- struct page *src_pg,
- unsigned int src_off,
- size_t len)
+static void ioat_unmap_page(struct dma_chan *chan, dma_addr_t handle,
+ size_t size, int direction)
{
- dma_addr_t dest_addr;
- dma_addr_t src_addr;
struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+ pci_unmap_page(ioat_chan->device->pdev, handle, size, direction);
+}
- dest_addr = pci_map_page(ioat_chan->device->pdev,
- dest_pg, dest_off, len, PCI_DMA_FROMDEVICE);
- src_addr = pci_map_page(ioat_chan->device->pdev,
- src_pg, src_off, len, PCI_DMA_TODEVICE);
-
- return do_ioat_dma_memcpy(ioat_chan, dest_addr, src_addr, len);
+static void ioat_unmap_single(struct dma_chan *chan, dma_addr_t handle,
+ size_t size, int direction)
+{
+ struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan);
+ pci_unmap_single(ioat_chan->device->pdev, handle, size, direction);
}
/**
@@ -467,8 +442,8 @@ #endif
* exceeding xfercap, perhaps. If so, only the last one will
* have a cookie, and require unmapping.
*/
- if (desc->cookie) {
- cookie = desc->cookie;
+ 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?
@@ -484,13 +459,18 @@ #endif
}
if (desc->phys != phys_complete) {
- /* a completed entry, but not the last, so cleanup */
- list_del(&desc->node);
- list_add_tail(&desc->node, &chan->free_desc);
+ /* 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, &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->cookie = 0;
+ desc->async_tx.cookie = 0;
/* TODO check status bits? */
break;
@@ -506,6 +486,17 @@ #endif
spin_unlock(&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(chan);
+ } else
+ spin_unlock_bh(&ioat_chan->desc_lock);
+}
+
/**
* ioat_dma_is_complete - poll the status of a IOAT DMA transaction
* @chan: IOAT DMA channel handle
@@ -607,6 +598,7 @@ static void ioat_start_null_desc(struct
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);
spin_unlock_bh(&ioat_chan->desc_lock);
@@ -633,6 +625,8 @@ static int ioat_self_test(struct ioat_de
u8 *src;
u8 *dest;
struct dma_chan *dma_chan;
+ struct dma_async_tx_descriptor *tx;
+ dma_addr_t addr;
dma_cookie_t cookie;
int err = 0;
@@ -658,7 +652,13 @@ static int ioat_self_test(struct ioat_de
goto out;
}
- cookie = ioat_dma_memcpy_buf_to_buf(dma_chan, dest, src, IOAT_TEST_SIZE);
+ tx = ioat_dma_prep_memcpy(dma_chan, IOAT_TEST_SIZE, 0);
+ async_tx_ack(tx);
+ addr = ioat_map_single(dma_chan, src, IOAT_TEST_SIZE, PCI_DMA_TODEVICE);
+ ioat_set_src(addr, tx, 0);
+ addr = ioat_map_single(dma_chan, dest, IOAT_TEST_SIZE, PCI_DMA_FROMDEVICE);
+ ioat_set_dest(addr, tx, 0);
+ cookie = ioat_tx_submit(tx);
ioat_dma_memcpy_issue_pending(dma_chan);
msleep(1);
@@ -754,13 +754,19 @@ #endif
INIT_LIST_HEAD(&device->common.channels);
enumerate_dma_channels(device);
+ set_bit(DMA_MEMCPY, &device->common.capabilities);
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_memcpy_buf_to_buf = ioat_dma_memcpy_buf_to_buf;
- device->common.device_memcpy_buf_to_pg = ioat_dma_memcpy_buf_to_pg;
- device->common.device_memcpy_pg_to_pg = ioat_dma_memcpy_pg_to_pg;
- device->common.device_memcpy_complete = ioat_dma_is_complete;
- device->common.device_memcpy_issue_pending = ioat_dma_memcpy_issue_pending;
+ device->common.device_prep_dma_memcpy = ioat_dma_prep_memcpy;
+ device->common.device_set_src = ioat_set_src;
+ device->common.device_set_dest = ioat_set_dest;
+ device->common.map_page = ioat_map_page;
+ device->common.map_single = ioat_map_single;
+ device->common.unmap_page = ioat_unmap_page;
+ device->common.unmap_single = ioat_unmap_single;
+ 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;
printk(KERN_INFO "Intel(R) I/OAT DMA Engine found, %d channels\n",
device->common.chancnt);
diff --git a/drivers/dma/ioatdma.h b/drivers/dma/ioatdma.h
index 62b26a9..fed259a 100644
--- a/drivers/dma/ioatdma.h
+++ b/drivers/dma/ioatdma.h
@@ -105,15 +105,20 @@ struct ioat_dma_chan {
/**
* struct ioat_desc_sw - wrapper around hardware descriptor
* @hw: hardware DMA descriptor
+ * @async_tx:
* @node:
+ * @group_list:
+ * @group_cnt:
* @cookie:
* @phys:
*/
struct ioat_desc_sw {
struct ioat_dma_descriptor *hw;
+ struct dma_async_tx_descriptor async_tx;
struct list_head node;
- dma_cookie_t cookie;
+ struct list_head group_list;
+ int group_count;
dma_addr_t phys;
DECLARE_PCI_UNMAP_ADDR(src)
DECLARE_PCI_UNMAP_LEN(src_len)
@@ -122,4 +127,3 @@ struct ioat_desc_sw {
};
#endif /* IOATDMA_H */
-
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index c94d8f1..541da4b 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -21,13 +21,12 @@
#ifndef DMAENGINE_H
#define DMAENGINE_H
-#ifdef CONFIG_DMA_ENGINE
-
#include <linux/device.h>
#include <linux/uio.h>
#include <linux/kref.h>
#include <linux/completion.h>
#include <linux/rcupdate.h>
+#include <linux/dma-mapping.h>
/**
* enum dma_event - resource PNP/power managment events
@@ -65,6 +64,47 @@ enum dma_status {
};
/**
+ * enum dma_transaction_type - DMA transaction types/indexes
+ */
+enum dma_transaction_type {
+ DMA_MEMCPY,
+ DMA_XOR,
+ DMA_PQ_XOR,
+ DMA_DUAL_XOR,
+ DMA_PQ_UPDATE,
+ DMA_ZERO_SUM,
+ DMA_PQ_ZERO_SUM,
+ DMA_MEMSET,
+ DMA_MEMCPY_CRC32C,
+ DMA_INTERRUPT,
+};
+
+#define DMA_TX_TYPE_START (DMA_MEMCPY)
+#define DMA_TX_TYPE_END (DMA_INTERRUPT)
+#define dma_async_for_each_tx_type(index) for (\
+ index = (unsigned long) DMA_TX_TYPE_START;\
+ index <= (unsigned long) DMA_TX_TYPE_END;\
+ index++)
+
+#define DMA_CHAN_REQUEST_ALL (-1)
+
+/**
+ * enum dma_capability - DMA transfer/transform capabilities
+ */
+enum dma_capability {
+ DMA_CAP_MEMCPY = (1 << DMA_MEMCPY),
+ DMA_CAP_XOR = (1 << DMA_XOR),
+ DMA_CAP_PQ_XOR = (1 << DMA_PQ_XOR),
+ DMA_CAP_DUAL_XOR = (1 << DMA_DUAL_XOR),
+ DMA_CAP_PQ_UPDATE = (1 << DMA_PQ_UPDATE),
+ DMA_CAP_ZERO_SUM = (1 << DMA_ZERO_SUM),
+ DMA_CAP_PQ_ZERO_SUM = (1 << DMA_PQ_ZERO_SUM),
+ DMA_CAP_MEMSET = (1 << DMA_MEMSET),
+ DMA_CAP_MEMCPY_CRC32C = (1 << DMA_MEMCPY_CRC32C),
+ DMA_CAP_INTERRUPT = (1 << DMA_INTERRUPT),
+};
+
+/**
* struct dma_chan_percpu - the per-CPU part of struct dma_chan
* @refcount: local_t used for open-coded "bigref" counting
* @memcpy_count: transaction counter
@@ -149,36 +189,79 @@ typedef void (*dma_event_callback) (stru
*/
struct dma_client {
dma_event_callback event_callback;
- unsigned int chan_count;
- unsigned int chans_desired;
+ int chan_count;
+ int chans_desired;
spinlock_t lock;
struct list_head channels;
struct list_head global_node;
};
+typedef void (*dma_async_tx_callback)(void *dma_async_param);
+/**
+ * struct dma_async_tx_descriptor - async transaction descriptor
+ * @ack: the descriptor can not be reused until the client acknowledges
+ * receipt, i.e. has has a chance to establish any dependency chains
+ * @cookie: tracking cookie for this transaction, set to -EBUSY if
+ * this tx is sitting on a dependency list
+ * @callback: routine to call after this operation is complete
+ * @callback_param: general parameter to pass to the callback routine
+ * @chan: target channel for this operation
+ * @depend_node: allow this transaction to be executed after another
+ * transaction has completed
+ * @depend_list: at completion this list of transactions are submitted
+ * @parent: pointer to the next level up in the dependency chain
+ * @lock: protect the dependency list
+ * @type: allows backend implementations to key off the tx_type
+ */
+struct dma_async_tx_descriptor {
+ int ack;
+ dma_cookie_t cookie;
+ dma_async_tx_callback callback;
+ void *callback_param;
+ struct dma_chan *chan;
+ struct list_head depend_node;
+ struct list_head depend_list;
+ struct dma_async_tx_descriptor *parent;
+ spinlock_t lock;
+ enum dma_transaction_type type;
+};
+
/**
* struct dma_device - info on the entity supplying DMA services
* @chancnt: how many DMA channels are supported
* @channels: the list of struct dma_chan
* @global_node: list_head for global dma_device_list
+ * @capabilities: one or more dma_capability flags
+ * @max_xor: maximum number of xor sources, 0 if no capability
* @refcount: reference count
* @done: IO completion struct
* @dev_id: unique device ID
* @device_alloc_chan_resources: allocate resources and return the
* number of allocated descriptors
* @device_free_chan_resources: release DMA channel's resources
- * @device_memcpy_buf_to_buf: memcpy buf pointer to buf pointer
- * @device_memcpy_buf_to_pg: memcpy buf pointer to struct page
- * @device_memcpy_pg_to_pg: memcpy struct page/offset to struct page/offset
- * @device_memcpy_complete: poll the status of an IOAT DMA transaction
- * @device_memcpy_issue_pending: push appended descriptors to hardware
+ * @device_prep_dma_memcpy: prepares a memcpy operation
+ * @device_prep_dma_xor: prepares a xor operation
+ * @device_prep_dma_zero_sum: prepares a zero_sum operation
+ * @device_prep_dma_memset: prepares a memset operation
+ * @device_prep_dma_interrupt: prepares an end of chain interrupt operation
+ * @device_tx_submit: execute an operation
+ * @device_set_dest: set a destination address in a hardware descriptor
+ * @device_set_src: set a source address in a hardware descriptor
+ * @device_dependency_added: async_tx notifies the channel about new deps
+ * @map_page: get a dma address that this device can use
+ * @map_single: get a dma address that this device can use
+ * @unmap_page: undo a dma mapping
+ * @unmap_single: undo a dma mapping
+ * @device_issue_pending: push pending transactions to hardware
*/
struct dma_device {
unsigned int chancnt;
struct list_head channels;
struct list_head global_node;
+ unsigned long capabilities;
+ unsigned int max_xor;
struct kref refcount;
struct completion done;
@@ -187,26 +270,46 @@ struct dma_device {
int (*device_alloc_chan_resources)(struct dma_chan *chan);
void (*device_free_chan_resources)(struct dma_chan *chan);
- dma_cookie_t (*device_memcpy_buf_to_buf)(struct dma_chan *chan,
- void *dest, void *src, size_t len);
- dma_cookie_t (*device_memcpy_buf_to_pg)(struct dma_chan *chan,
- struct page *page, unsigned int offset, void *kdata,
- size_t len);
- dma_cookie_t (*device_memcpy_pg_to_pg)(struct dma_chan *chan,
- struct page *dest_pg, unsigned int dest_off,
- struct page *src_pg, unsigned int src_off, size_t len);
- enum dma_status (*device_memcpy_complete)(struct dma_chan *chan,
+
+ struct dma_async_tx_descriptor *(*device_prep_dma_memcpy)(
+ struct dma_chan *chan, size_t len, int int_en);
+ struct dma_async_tx_descriptor *(*device_prep_dma_xor)(
+ struct dma_chan *chan, unsigned int src_cnt, size_t len,
+ int int_en);
+ struct dma_async_tx_descriptor *(*device_prep_dma_zero_sum)(
+ struct dma_chan *chan, unsigned int src_cnt, size_t len,
+ u32 *result, int int_en);
+ struct dma_async_tx_descriptor *(*device_prep_dma_memset)(
+ struct dma_chan *chan, int value, size_t len, int int_en);
+ struct dma_async_tx_descriptor *(*device_prep_dma_interrupt)(
+ struct dma_chan *chan);
+
+ dma_cookie_t (*device_tx_submit)(struct dma_async_tx_descriptor *tx);
+ void (*device_set_dest)(dma_addr_t addr,
+ struct dma_async_tx_descriptor *tx, int index);
+ void (*device_set_src)(dma_addr_t addr,
+ struct dma_async_tx_descriptor *tx, int index);
+ void (*device_dependency_added)(struct dma_chan *chan);
+ enum dma_status (*device_is_tx_complete)(struct dma_chan *chan,
dma_cookie_t cookie, dma_cookie_t *last,
dma_cookie_t *used);
- void (*device_memcpy_issue_pending)(struct dma_chan *chan);
+ dma_addr_t (*map_page)(struct dma_chan *chan, struct page *page,
+ unsigned long offset, size_t size,
+ int direction);
+ dma_addr_t (*map_single)(struct dma_chan *chan, void *cpu_addr,
+ size_t size, int direction);
+ void (*unmap_page)(struct dma_chan *chan, dma_addr_t handle,
+ size_t size, int direction);
+ void (*unmap_single)(struct dma_chan *chan, dma_addr_t handle,
+ size_t size, int direction);
+ void (*device_issue_pending)(struct dma_chan *chan);
};
/* --- public DMA engine API --- */
struct dma_client *dma_async_client_register(dma_event_callback event_callback);
void dma_async_client_unregister(struct dma_client *client);
-void dma_async_client_chan_request(struct dma_client *client,
- unsigned int number);
+void dma_async_client_chan_request(struct dma_client *client, int number);
/**
* dma_async_memcpy_buf_to_buf - offloaded copy between virtual addresses
@@ -221,14 +324,31 @@ void dma_async_client_chan_request(struc
* user space pages).
*/
static inline dma_cookie_t dma_async_memcpy_buf_to_buf(struct dma_chan *chan,
- void *dest, void *src, size_t len)
+ void *dest, void *src, size_t len)
{
- int cpu = get_cpu();
+ struct dma_device *dev = chan->device;
+ struct dma_async_tx_descriptor *tx;
+ dma_addr_t addr;
+ dma_cookie_t cookie;
+ int cpu;
+
+ tx = dev->device_prep_dma_memcpy(chan, len, 0);
+ if (!tx)
+ return -ENOMEM;
+
+ tx->ack = 1;
+ addr = dev->map_single(chan, src, len, DMA_TO_DEVICE);
+ dev->device_set_src(addr, tx, 0);
+ addr = dev->map_single(chan, dest, len, DMA_FROM_DEVICE);
+ dev->device_set_dest(addr, tx, 0);
+ cookie = dev->device_tx_submit(tx);
+
+ cpu = get_cpu();
per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
per_cpu_ptr(chan->local, cpu)->memcpy_count++;
put_cpu();
- return chan->device->device_memcpy_buf_to_buf(chan, dest, src, len);
+ return cookie;
}
/**
@@ -245,15 +365,31 @@ static inline dma_cookie_t dma_async_mem
* locked user space pages)
*/
static inline dma_cookie_t dma_async_memcpy_buf_to_pg(struct dma_chan *chan,
- struct page *page, unsigned int offset, void *kdata, size_t len)
+ struct page *page, unsigned int offset, void *kdata, size_t len)
{
- int cpu = get_cpu();
+ struct dma_device *dev = chan->device;
+ struct dma_async_tx_descriptor *tx;
+ dma_addr_t addr;
+ dma_cookie_t cookie;
+ int cpu;
+
+ tx = dev->device_prep_dma_memcpy(chan, len, 0);
+ if (!tx)
+ return -ENOMEM;
+
+ tx->ack = 1;
+ addr = dev->map_single(chan, kdata, len, DMA_TO_DEVICE);
+ dev->device_set_src(addr, tx, 0);
+ addr = dev->map_page(chan, page, offset, len, DMA_FROM_DEVICE);
+ dev->device_set_dest(addr, tx, 0);
+ cookie = dev->device_tx_submit(tx);
+
+ cpu = get_cpu();
per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
per_cpu_ptr(chan->local, cpu)->memcpy_count++;
put_cpu();
- return chan->device->device_memcpy_buf_to_pg(chan, page, offset,
- kdata, len);
+ return cookie;
}
/**
@@ -271,32 +407,60 @@ static inline dma_cookie_t dma_async_mem
* (kernel memory or locked user space pages).
*/
static inline dma_cookie_t dma_async_memcpy_pg_to_pg(struct dma_chan *chan,
- struct page *dest_pg, unsigned int dest_off, struct page *src_pg,
- unsigned int src_off, size_t len)
+ struct page *dest_pg, unsigned int dest_off, struct page *src_pg,
+ unsigned int src_off, size_t len)
{
- int cpu = get_cpu();
+ struct dma_device *dev = chan->device;
+ struct dma_async_tx_descriptor *tx;
+ dma_addr_t addr;
+ dma_cookie_t cookie;
+ int cpu;
+
+ tx = dev->device_prep_dma_memcpy(chan, len, 0);
+ if (!tx)
+ return -ENOMEM;
+
+ tx->ack = 1;
+ addr = dev->map_page(chan, src_pg, src_off, len, DMA_TO_DEVICE);
+ dev->device_set_src(addr, tx, 0);
+ addr = dev->map_page(chan, dest_pg, dest_off, len, DMA_FROM_DEVICE);
+ dev->device_set_dest(addr, tx, 0);
+ cookie = dev->device_tx_submit(tx);
+
+ cpu = get_cpu();
per_cpu_ptr(chan->local, cpu)->bytes_transferred += len;
per_cpu_ptr(chan->local, cpu)->memcpy_count++;
put_cpu();
- return chan->device->device_memcpy_pg_to_pg(chan, dest_pg, dest_off,
- src_pg, src_off, len);
+ return cookie;
+}
+
+static inline void
+dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx,
+ struct dma_chan *chan)
+{
+ tx->chan = chan;
+ spin_lock_init(&tx->lock);
+ INIT_LIST_HEAD(&tx->depend_node);
+ INIT_LIST_HEAD(&tx->depend_list);
}
/**
- * dma_async_memcpy_issue_pending - flush pending copies to HW
+ * dma_async_issue_pending - flush pending transactions to HW
* @chan: target DMA channel
*
* This allows drivers to push copies to HW in batches,
* reducing MMIO writes where possible.
*/
-static inline void dma_async_memcpy_issue_pending(struct dma_chan *chan)
+static inline void dma_async_issue_pending(struct dma_chan *chan)
{
- return chan->device->device_memcpy_issue_pending(chan);
+ return chan->device->device_issue_pending(chan);
}
+#define dma_async_memcpy_issue_pending(chan) dma_async_issue_pending(chan)
+
/**
- * dma_async_memcpy_complete - poll for transaction completion
+ * dma_async_is_tx_complete - poll for transaction completion
* @chan: DMA channel
* @cookie: transaction identifier to check status of
* @last: returns last completed cookie, can be NULL
@@ -306,12 +470,15 @@ static inline void dma_async_memcpy_issu
* internal state and can be used with dma_async_is_complete() to check
* the status of multiple cookies without re-checking hardware state.
*/
-static inline enum dma_status dma_async_memcpy_complete(struct dma_chan *chan,
+static inline enum dma_status dma_async_is_tx_complete(struct dma_chan *chan,
dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used)
{
- return chan->device->device_memcpy_complete(chan, cookie, last, used);
+ return chan->device->device_is_tx_complete(chan, cookie, last, used);
}
+#define dma_async_memcpy_complete(chan, cookie, last, used)\
+ dma_async_is_tx_complete(chan, cookie, last, used)
+
/**
* dma_async_is_complete - test a cookie against chan state
* @cookie: transaction identifier to test status of
@@ -334,6 +501,23 @@ static inline enum dma_status dma_async_
return DMA_IN_PROGRESS;
}
+static inline enum dma_status dma_sync_wait(struct dma_chan *chan,
+ dma_cookie_t cookie)
+{
+ enum dma_status status;
+ unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000);
+
+ dma_async_issue_pending(chan);
+ do {
+ status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
+ if (time_after_eq(jiffies, dma_sync_wait_timeout)) {
+ printk(KERN_ERR "dma_sync_wait_timeout!\n");
+ return DMA_ERROR;
+ }
+ } while (status == DMA_IN_PROGRESS);
+
+ return status;
+}
/* --- DMA device --- */
@@ -362,5 +546,4 @@ dma_cookie_t dma_memcpy_pg_to_iovec(stru
struct dma_pinned_list *pinned_list, struct page *page,
unsigned int offset, size_t len);
-#endif /* CONFIG_DMA_ENGINE */
#endif /* DMAENGINE_H */
-
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