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Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx

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* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx: (22 commits)
  ioat: fix self test for multi-channel case
  dmaengine: bump initcall level to arch_initcall
  dmaengine: advertise all channels on a device to dma_filter_fn
  dmaengine: use idr for registering dma device numbers
  dmaengine: add a release for dma class devices and dependent infrastructure
  ioat: do not perform removal actions at shutdown
  iop-adma: enable module removal
  iop-adma: kill debug BUG_ON
  iop-adma: let devm do its job, don't duplicate free
  dmaengine: kill enum dma_state_client
  dmaengine: remove 'bigref' infrastructure
  dmaengine: kill struct dma_client and supporting infrastructure
  dmaengine: replace dma_async_client_register with dmaengine_get
  atmel-mci: convert to dma_request_channel and down-level dma_slave
  dmatest: convert to dma_request_channel
  dmaengine: introduce dma_request_channel and private channels
  net_dma: convert to dma_find_channel
  dmaengine: provide a common 'issue_pending_all' implementation
  dmaengine: centralize channel allocation, introduce dma_find_channel
  dmaengine: up-level reference counting to the module level
  ...
This commit is contained in:
Linus Torvalds
2009-01-09 11:52:14 -08:00
parent 2150edc6c5 b9bdcbba01
commit d9e8a3a5b8
26 changed files with 918 additions and 1278 deletions
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149
net/core/dev.c
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@@ -170,25 +170,6 @@ static DEFINE_SPINLOCK(ptype_lock);
static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
static struct list_head ptype_all __read_mostly; /* Taps */
#ifdef CONFIG_NET_DMA
struct net_dma {
struct dma_client client;
spinlock_t lock;
cpumask_t channel_mask;
struct dma_chan **channels;
};
static enum dma_state_client
netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
enum dma_state state);
static struct net_dma net_dma = {
.client = {
.event_callback = netdev_dma_event,
},
};
#endif
/*
* The @dev_base_head list is protected by @dev_base_lock and the rtnl
* semaphore.
@@ -2754,14 +2735,7 @@ out:
* There may not be any more sk_buffs coming right now, so push
* any pending DMA copies to hardware
*/
if (!cpus_empty(net_dma.channel_mask)) {
int chan_idx;
for_each_cpu_mask_nr(chan_idx, net_dma.channel_mask) {
struct dma_chan *chan = net_dma.channels[chan_idx];
if (chan)
dma_async_memcpy_issue_pending(chan);
}
}
dma_issue_pending_all();
#endif
return;
@@ -4952,122 +4926,6 @@ static int dev_cpu_callback(struct notifier_block *nfb,
return NOTIFY_OK;
}
#ifdef CONFIG_NET_DMA
/**
* net_dma_rebalance - try to maintain one DMA channel per CPU
* @net_dma: DMA client and associated data (lock, channels, channel_mask)
*
* This is called when the number of channels allocated to the net_dma client
* changes. The net_dma client tries to have one DMA channel per CPU.
*/
static void net_dma_rebalance(struct net_dma *net_dma)
{
unsigned int cpu, i, n, chan_idx;
struct dma_chan *chan;
if (cpus_empty(net_dma->channel_mask)) {
for_each_online_cpu(cpu)
rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
return;
}
i = 0;
cpu = first_cpu(cpu_online_map);
for_each_cpu_mask_nr(chan_idx, net_dma->channel_mask) {
chan = net_dma->channels[chan_idx];
n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
+ (i < (num_online_cpus() %
cpus_weight(net_dma->channel_mask)) ? 1 : 0));
while(n) {
per_cpu(softnet_data, cpu).net_dma = chan;
cpu = next_cpu(cpu, cpu_online_map);
n--;
}
i++;
}
}
/**
* netdev_dma_event - event callback for the net_dma_client
* @client: should always be net_dma_client
* @chan: DMA channel for the event
* @state: DMA state to be handled
*/
static enum dma_state_client
netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
enum dma_state state)
{
int i, found = 0, pos = -1;
struct net_dma *net_dma =
container_of(client, struct net_dma, client);
enum dma_state_client ack = DMA_DUP; /* default: take no action */
spin_lock(&net_dma->lock);
switch (state) {
case DMA_RESOURCE_AVAILABLE:
for (i = 0; i < nr_cpu_ids; i++)
if (net_dma->channels[i] == chan) {
found = 1;
break;
} else if (net_dma->channels[i] == NULL && pos < 0)
pos = i;
if (!found && pos >= 0) {
ack = DMA_ACK;
net_dma->channels[pos] = chan;
cpu_set(pos, net_dma->channel_mask);
net_dma_rebalance(net_dma);
}
break;
case DMA_RESOURCE_REMOVED:
for (i = 0; i < nr_cpu_ids; i++)
if (net_dma->channels[i] == chan) {
found = 1;
pos = i;
break;
}
if (found) {
ack = DMA_ACK;
cpu_clear(pos, net_dma->channel_mask);
net_dma->channels[i] = NULL;
net_dma_rebalance(net_dma);
}
break;
default:
break;
}
spin_unlock(&net_dma->lock);
return ack;
}
/**
* netdev_dma_register - register the networking subsystem as a DMA client
*/
static int __init netdev_dma_register(void)
{
net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
GFP_KERNEL);
if (unlikely(!net_dma.channels)) {
printk(KERN_NOTICE
"netdev_dma: no memory for net_dma.channels\n");
return -ENOMEM;
}
spin_lock_init(&net_dma.lock);
dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
dma_async_client_register(&net_dma.client);
dma_async_client_chan_request(&net_dma.client);
return 0;
}
#else
static int __init netdev_dma_register(void) { return -ENODEV; }
#endif /* CONFIG_NET_DMA */
/**
* netdev_increment_features - increment feature set by one
@@ -5287,14 +5145,15 @@ static int __init net_dev_init(void)
if (register_pernet_device(&default_device_ops))
goto out;
netdev_dma_register();
open_softirq(NET_TX_SOFTIRQ, net_tx_action);
open_softirq(NET_RX_SOFTIRQ, net_rx_action);
hotcpu_notifier(dev_cpu_callback, 0);
dst_init();
dev_mcast_init();
#ifdef CONFIG_NET_DMA
dmaengine_get();
#endif
rc = 0;
out:
return rc;