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Subject[RFC] [PATCH 1/3] ioat: DMA subsystem

diff --git a/drivers/Kconfig b/drivers/Kconfig
index 48f446d..fbe5116 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -66,4 +66,6 @@ source "drivers/infiniband/Kconfig"

source "drivers/sn/Kconfig"

+source "drivers/dma/Kconfig"
+
endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index 1a109a6..4bd0ab6 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -67,3 +67,4 @@ obj-$(CONFIG_INFINIBAND) += infiniband/
obj-$(CONFIG_SGI_IOC4) += sn/
obj-y += firmware/
obj-$(CONFIG_CRYPTO) += crypto/
+obj-$(CONFIG_DMA_ENGINE) += dma/
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
new file mode 100644
index 0000000..dde603d
--- /dev/null
+++ b/drivers/dma/Kconfig
@@ -0,0 +1,40 @@
+#
+# DMA engine configuration
+#
+
+menu "DMA Engine support"
+
+config DMA_ENGINE
+ bool "Support for DMA engines"
+ ---help---
+ DMA engines offload copy operations from the CPU to dedicated
+ hardware, allowing the copies to happen asynchronously.
+
+config NET_DMA
+ bool "Use DMA engines in the network stack"
+ depends on DMA_ENGINE
+ ---help---
+ Say Y to enable the use of DMA engines in the network stack to
+ offload receive copy-to-user operations, freeing CPU cycles.
+
+config NET_DMA_EARLY
+ bool "Do early DMA copies"
+ depends on NET_DMA
+ ---help---
+ Enabling this will cause the network stack to start DMA copies
+ earlier. This can improve throughput, but this is also a more
+ invasive change, and can be unstable.
+
+#
+#
+#
+
+config DMA_TESTCLIENT
+ tristate "DMA test client"
+ depends on DMA_ENGINE
+ ---help---
+ The CB test client driver performs a DMA-assisted memcpy on module
+ load, and prints the result when unloaded. It is pretty simple, but
+ maybe someday this will grow up into an actually useful test client.
+
+endmenu
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
new file mode 100644
index 0000000..abb83be
--- /dev/null
+++ b/drivers/dma/Makefile
@@ -0,0 +1,5 @@
+-include $(PWD)/config
+
+obj-y += dmaengine.o
+
+obj-$(CONFIG_DMA_TESTCLIENT) += testclient.o
diff --git a/drivers/dma/cb_list.h b/drivers/dma/cb_list.h
new file mode 100644
index 0000000..f2cc2d7
--- /dev/null
+++ b/drivers/dma/cb_list.h
@@ -0,0 +1,12 @@
+/* Extra macros that build on <linux/list.h> */
+#ifndef CB_LIST_H
+#define CB_LIST_H
+
+#include <linux/list.h>
+
+/* Provide some safty to list_add, which I find easy to swap the arguments to */
+
+#define list_add_entry(pos, head, member) list_add(&pos->member, head)
+#define list_add_entry_tail(pos, head, member) list_add_tail(&pos->member, head)
+
+#endif /* CB_LIST_H */
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
new file mode 100644
index 0000000..fe240c8
--- /dev/null
+++ b/drivers/dma/dmaengine.c
@@ -0,0 +1,394 @@
+/*******************************************************************************
+
+
+ Copyright(c) 2004 - 2005 Intel Corporation. All rights reserved.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your option)
+ any later version.
+
+ 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., 59
+ Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ The full GNU General Public License is included in this distribution in the
+ file called LICENSE.
+
+*******************************************************************************/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#include <linux/hardirq.h>
+#include <linux/spinlock.h>
+#include <linux/percpu.h>
+#include "cb_list.h"
+
+static LIST_HEAD(dma_device_list);
+static LIST_HEAD(dma_client_list);
+
+DEFINE_PER_CPU(struct completion, kick_dma_poll);
+
+/* --- sysfs implementation --- */
+
+static ssize_t show_memcpy_count(struct class_device *cd, char *buf)
+{
+ struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev);
+
+ sprintf(buf, "%lu\n", chan->memcpy_count);
+ return strlen(buf) + 1;
+}
+
+static ssize_t show_bytes_transferred(struct class_device *cd, char *buf)
+{
+ struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev);
+
+ sprintf(buf, "%lu\n", chan->bytes_transferred);
+ return strlen(buf) + 1;
+}
+
+static ssize_t show_in_use(struct class_device *cd, char *buf)
+{
+ struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev);
+
+ sprintf(buf, "%d\n", (chan->client ? 1 : 0));
+ return strlen(buf) + 1;
+}
+
+static ssize_t show_min_hw_copy_size(struct class_device *cd, char *buf)
+{
+ struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev);
+
+ sprintf(buf, "%d\n", chan->min_copy_size);
+ return strlen(buf) + 1;
+}
+
+static ssize_t store_min_hw_copy_size(struct class_device *cd, const char *buf, size_t count)
+{
+ struct dma_chan *chan = container_of(cd, struct dma_chan, class_dev);
+
+ chan->min_copy_size = simple_strtoul(buf, NULL, 0);
+
+ return count;
+}
+
+static struct class_device_attribute dma_class_attrs[] = {
+ __ATTR(memcpy_count, S_IRUGO, show_memcpy_count, NULL),
+ __ATTR(bytes_transferred, S_IRUGO, show_bytes_transferred, NULL),
+ __ATTR(in_use, S_IRUGO, show_in_use, NULL),
+ __ATTR(min_copy_size, S_IRUGO | S_IWUSR, show_min_hw_copy_size, store_min_hw_copy_size),
+ __ATTR_NULL
+};
+
+static void
+dma_class_release(struct class_device *cd)
+{
+ /* do something */
+}
+
+static struct class dma_devclass = {
+ .name = "dma",
+ .release = dma_class_release,
+ .class_dev_attrs = dma_class_attrs,
+};
+
+/* --- client and device registration --- */
+
+static struct dma_chan *
+dma_client_chan_alloc(struct dma_client *client)
+{
+ struct dma_device *device;
+ struct dma_chan *chan;
+
+ BUG_ON(!client);
+
+ /* Find a channel, any DMA engine will do */
+ list_for_each_entry(device, &dma_device_list, global_node) {
+ list_for_each_entry(chan, &device->channels, device_node) {
+ if (chan->client)
+ continue;
+
+ if (chan->device->device_alloc_chan_resources(chan) >= 0) {
+ chan->client = client;
+ list_add_entry_tail(chan, &client->channels, client_node);
+ return chan;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+static void
+dma_client_chan_free(struct dma_chan *chan)
+{
+ BUG_ON(!chan);
+
+ chan->device->device_free_chan_resources(chan);
+ chan->client = NULL;
+}
+
+static void
+dma_chans_rebalance(void)
+{
+ struct dma_client *client;
+ struct dma_chan *chan;
+
+ list_for_each_entry(client, &dma_client_list, global_node) {
+
+ while (client->chans_desired > client->chan_count) {
+ chan = dma_client_chan_alloc(client);
+ if (!chan)
+ break;
+
+ client->chan_count++;
+ client->event_callback(client, chan, DMA_RESOURCE_ADDED);
+ }
+
+ while (client->chans_desired < client->chan_count) {
+ chan = list_entry(client->channels.next, struct dma_chan, client_node);
+ list_del(&chan->client_node);
+ client->chan_count--;
+ client->event_callback(client, chan, DMA_RESOURCE_REMOVED);
+ dma_client_chan_free(chan);
+ }
+ }
+}
+
+struct dma_client *
+dma_async_client_register(dma_event_callback event_callback)
+{
+ struct dma_client *client;
+
+ BUG_ON(!event_callback);
+
+ client = kmalloc(sizeof(*client), GFP_KERNEL);
+ if (!client)
+ return NULL;
+
+ INIT_LIST_HEAD(&client->channels);
+
+ client->chans_desired = 0;
+ client->chan_count = 0;
+ client->event_callback = event_callback;
+
+ list_add_entry_tail(client, &dma_client_list, global_node);
+
+ return client;
+}
+
+void
+dma_async_client_unregister(struct dma_client *client)
+{
+ struct dma_chan *chan, *_chan;
+
+ if (!client)
+ return;
+
+ list_for_each_entry_safe(chan, _chan, &client->channels, client_node) {
+ dma_client_chan_free(chan);
+ }
+
+ list_del(&client->global_node);
+
+ kfree(client);
+
+ dma_chans_rebalance();
+}
+
+void
+dma_async_client_chan_request(struct dma_client *client, unsigned int number)
+{
+ BUG_ON(!client);
+
+ client->chans_desired = number;
+
+ dma_chans_rebalance();
+}
+
+dma_cookie_t
+dma_async_memcpy_buf_to_buf(
+ struct dma_chan *chan,
+ void *dest,
+ void *src,
+ size_t len)
+{
+ chan->bytes_transferred += len;
+ chan->memcpy_count++;
+
+ return chan->device->device_memcpy_buf_to_buf(chan, dest, src, len);
+}
+
+dma_cookie_t
+dma_async_memcpy_buf_to_pg(
+ struct dma_chan *chan,
+ struct page *page,
+ unsigned int offset,
+ void *kdata,
+ size_t len)
+{
+ chan->bytes_transferred += len;
+ chan->memcpy_count++;
+
+ return chan->device->device_memcpy_buf_to_pg(chan, page, offset, kdata, len);
+}
+
+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)
+{
+ chan->bytes_transferred += len;
+ chan->memcpy_count++;
+
+ return chan->device->device_memcpy_pg_to_pg(chan, dest_pg, dest_off,
+ src_pg, src_off, len);
+}
+
+void
+dma_async_memcpy_issue_pending(struct dma_chan *chan)
+{
+ return chan->device->device_memcpy_issue_pending(chan);
+}
+
+enum dma_status_t
+dma_async_memcpy_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);
+}
+
+int
+dma_async_device_register(struct dma_device *device)
+{
+ static int id;
+ int chancnt = 0;
+ struct dma_chan* chan;
+
+ if (!device)
+ return -ENODEV;
+
+ list_add_entry_tail(device, &dma_device_list, global_node);
+
+ dma_chans_rebalance();
+
+ device->dev_id = id++;
+
+ /* represent channels in sysfs. Probably want devs too */
+ list_for_each_entry(chan, &device->channels, device_node) {
+ chan->chan_id = chancnt++;
+ chan->class_dev.class = &dma_devclass;
+ chan->class_dev.dev = NULL;
+ snprintf(chan->class_dev.class_id, BUS_ID_SIZE, "dma%dchan%d",
+ device->dev_id, chan->chan_id);
+
+ chan->min_copy_size = DMA_DEFAULT_MIN_COPY_SIZE;
+ class_device_register(&chan->class_dev);
+ }
+
+ return 0;
+}
+
+void
+dma_async_device_unregister(struct dma_device* device)
+{
+ struct dma_chan *chan;
+
+ BUG_ON(!device);
+
+ list_for_each_entry(chan, &device->channels, device_node) {
+ if (chan->client) {
+ list_del(&chan->client_node);
+ chan->client->chan_count--;
+ chan->client->event_callback(chan->client, chan, DMA_RESOURCE_REMOVED);
+ dma_client_chan_free(chan);
+ }
+ class_device_unregister(&chan->class_dev);
+ }
+
+ list_del(&device->global_node);
+
+ dma_chans_rebalance();
+}
+
+static struct workqueue_struct *dma_wait_wq;
+static LIST_HEAD(dma_poll_list);
+
+enum dma_status_t
+dma_async_wait_for_completion(struct dma_chan *chan, dma_cookie_t cookie)
+{
+ while (dma_async_memcpy_complete(chan, cookie, NULL, NULL) == DMA_IN_PROGRESS)
+ schedule();
+
+ return DMA_SUCCESS;
+}
+
+#if 0
+static void
+dma_poll(void *data)
+{
+ struct dma_completion *comp = data;
+
+ comp->status = dma_memcpy_complete(comp->chan, comp->cookie);
+ while (comp->status == DMA_IN_PROGRESS) {
+ comp->chan->device->device_arm_interrupt(comp->chan);
+ wait_for_completion(&__get_cpu_var(kick_dma_poll));
+ comp->status = dma_memcpy_complete(comp->chan, comp->cookie);
+ }
+ complete(&comp->comp);
+}
+
+enum dma_status_t
+dma_wait_for_completion(struct dma_chan *chan, dma_cookie_t cookie)
+{
+ enum dma_status_t status;
+ DECLARE_DMA_COMPLETION(comp, chan, cookie);
+ DECLARE_WORK(dma_wait_work, dma_poll, &comp);
+
+ BUG_ON(in_interrupt());
+
+ status = dma_memcpy_complete(chan, cookie);
+ if (status != DMA_IN_PROGRESS)
+ return status;
+
+ queue_work(dma_wait_wq, &dma_wait_work);
+ wait_for_completion(&comp.comp);
+ return comp.status;
+}
+#endif
+
+static int __init dma_bus_init(void)
+{
+ int cpu;
+
+ dma_wait_wq = create_workqueue("dmapoll");
+ for_each_online_cpu(cpu) {
+ init_completion(&per_cpu(kick_dma_poll, cpu));
+ }
+ return class_register(&dma_devclass);
+}
+
+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_device_register);
+EXPORT_SYMBOL(dma_async_device_unregister);
+EXPORT_SYMBOL(dma_async_wait_for_completion);
+EXPORT_PER_CPU_SYMBOL(kick_dma_poll);
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
new file mode 100644
index 0000000..7b4f58b
--- /dev/null
+++ b/include/linux/dmaengine.h
@@ -0,0 +1,268 @@
+/*******************************************************************************
+
+
+ Copyright(c) 2004 - 2005 Intel Corporation. All rights reserved.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your option)
+ any later version.
+
+ 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., 59
+ Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ The full GNU General Public License is included in this distribution in the
+ file called LICENSE.
+
+*******************************************************************************/
+
+
+#ifndef DMAENGINE_H
+#define DMAENGINE_H
+
+#include <linux/device.h>
+#include <linux/uio.h>
+#include <linux/skbuff.h>
+
+DECLARE_PER_CPU(struct completion, kick_dma_poll);
+
+#define DMA_DEFAULT_MIN_COPY_SIZE 16
+
+/**
+ * enum dma_event_t - resource PNP/power managment events
+ * @DMA_RESOURCE_SUSPEND: DMA device going into low power state
+ * @DMA_RESOURCE_RESUME: DMA device returning to full power
+ * @DMA_RESOURCE_ADDED: DMA device added to the system
+ * @DMA_RESOURCE_REMOVED: DMA device removed from the system
+ */
+enum dma_event_t {
+ DMA_RESOURCE_SUSPEND,
+ DMA_RESOURCE_RESUME,
+ DMA_RESOURCE_ADDED,
+ DMA_RESOURCE_REMOVED,
+};
+
+/**
+ * typedef dma_cookie_t
+ *
+ * if dma_cookie_t is >0 it's a DMA request cookie, <0 it's an error code
+ */
+typedef s32 dma_cookie_t;
+
+/*#define dma_submit_error(cookie) ((cookie) < 0 ? 1 : 0)*/
+
+/**
+ * enum dma_status_t - DMA transaction status
+ * @DMA_SUCCESS: transaction completed successfully
+ * @DMA_IN_PROGRESS: transaction not yet processed
+ * @DMA_ERROR: transaction failed
+ */
+enum dma_status_t {
+ DMA_SUCCESS,
+ DMA_IN_PROGRESS,
+ DMA_ERROR,
+};
+
+/**
+ * struct dma_chan - devices supply DMA channels, clients use them
+ * @client: ptr to the client user of this chan, will be NULL when unused
+ * @device: ptr to the dma device who supplies this channel, always !NULL
+ * @client_node: used to add this to the client chan list
+ * @device_node: used to add this to the device chan list
+ */
+struct dma_chan
+{
+ struct dma_client *client;
+ struct dma_device *device;
+ dma_cookie_t cookie;
+
+ /* sysfs */
+ int chan_id;
+ struct class_device class_dev;
+
+ /* stats */
+ unsigned long memcpy_count;
+ unsigned long bytes_transferred;
+ unsigned int min_copy_size;
+
+ struct list_head client_node;
+ struct list_head device_node;
+
+ cpumask_t cpumask;
+};
+
+/*
+ * typedef dma_event_callback - function pointer to a DMA event callback
+ */
+typedef void (*dma_event_callback) (struct dma_client *client, struct dma_chan *chan, enum dma_event_t event);
+
+/**
+ * struct dma_client - info on the entity making use of DMA services
+ * @event_callback: func ptr to call when something happens
+ * @chan_count: number of chans allocated
+ * @chans_desired: number of chans requested. Can be +- chan_count
+ * @port: upstream DMA port from the client's PCI device
+ * @channels: the list of DMA channels allocated
+ * @global_node: list_head for global dma_client_list
+ */
+struct dma_client {
+ dma_event_callback event_callback;
+ unsigned int chan_count;
+ unsigned int chans_desired;
+
+ /* TODO keep some stats */
+ struct list_head channels;
+ struct list_head global_node;
+};
+
+/**
+ * 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
+ * Other func ptrs: used to make use of this device's capabilities
+ */
+struct dma_device {
+
+ unsigned int chancnt;
+ struct list_head channels;
+ struct list_head global_node;
+
+ int dev_id;
+ /*struct class_device class_dev;*/
+
+ 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);
+ void (*device_arm_interrupt)(struct dma_chan *chan);
+ enum dma_status_t (*device_memcpy_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);
+};
+
+/* --- 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);
+
+dma_cookie_t
+dma_async_memcpy_buf_to_buf(
+ struct dma_chan *chan,
+ void *dest,
+ void *src,
+ size_t len);
+
+dma_cookie_t
+dma_async_memcpy_buf_to_pg(
+ struct dma_chan *chan,
+ struct page *page,
+ unsigned int offset,
+ void *kdata,
+ size_t len);
+
+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);
+
+void dma_async_memcpy_issue_pending(struct dma_chan *);
+
+enum dma_status_t
+dma_async_wait_for_completion(struct dma_chan *chan, dma_cookie_t cookie);
+
+static inline enum dma_status_t
+dma_async_is_complete(
+ dma_cookie_t cookie,
+ dma_cookie_t last_complete,
+ dma_cookie_t last_used) {
+
+ if (last_complete <= last_used) {
+ if ((cookie <= last_complete) || (cookie > last_used))
+ return DMA_SUCCESS;
+ } else {
+ if ((cookie <= last_complete) && (cookie > last_used))
+ return DMA_SUCCESS;
+ }
+ return DMA_IN_PROGRESS;
+}
+
+enum dma_status_t
+dma_async_memcpy_complete(struct dma_chan *chan, dma_cookie_t cookie, dma_cookie_t *last, dma_cookie_t *used);
+
+u32
+dma_async_get_errors(struct dma_chan *chan, dma_cookie_t cookie);
+
+/* --- DMA device --- */
+
+int dma_async_device_register(
+ struct dma_device *device);
+
+void dma_async_device_unregister(
+ struct dma_device *device);
+
+/* --- DMA completion --- */
+
+struct dma_completion
+{
+ struct dma_chan *chan;
+ dma_cookie_t cookie;
+ enum dma_status_t status;
+ struct completion comp;
+};
+
+#define DMA_COMPLETION_INITIALIZER(name, chan, cookie) \
+{ .chan = chan, \
+ .cookie = cookie, \
+ .status = DMA_IN_PROGRESS, \
+ .comp = COMPLETION_INITIALIZER((name).comp) }
+
+#define DECLARE_DMA_COMPLETION(name, chan, cookie) \
+struct dma_completion name = DMA_COMPLETION_INITIALIZER(name, chan, cookie)
+
+/* --- net iovec stuff --- */
+
+DECLARE_PER_CPU(struct dma_chan *, net_dma);
+
+struct dma_page_list
+{
+ char *base_address;
+ int nr_pages;
+ struct page **pages;
+};
+
+struct dma_locked_list
+{
+ int nr_iovecs;
+ struct dma_page_list page_list[0];
+};
+
+int dma_lock_iovec_pages(struct iovec *iov, size_t len, struct dma_locked_list **locked_list);
+void dma_unlock_iovec_pages(struct dma_locked_list* locked_list);
+int
+dma_skb_copy_datagram_iovec(struct dma_chan* chan, const struct sk_buff *skb, int offset,
+ struct iovec *to, size_t len, struct dma_locked_list *locked_list);
+void dma_memcpy_toiovec_wait(struct dma_chan *chan, dma_cookie_t cookie);
+void dma_async_try_early_copy(struct sock *sk, struct sk_buff *skb);
+
+#endif /* DMAENGINE_H */





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