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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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