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Subject[patch 18/41] cpu alloc: Dmaengine conversion
Convert DMA engine to use CPU_xx operations. This also removes the use of local_t
from the dmaengine.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
---
drivers/dma/dmaengine.c | 38 ++++++++++++++------------------------
include/linux/dmaengine.h | 16 ++++++----------
2 files changed, 20 insertions(+), 34 deletions(-)
Index: linux-2.6/drivers/dma/dmaengine.c
===================================================================
--- linux-2.6.orig/drivers/dma/dmaengine.c 2008-04-29 14:55:49.000000000 -0700
+++ linux-2.6/drivers/dma/dmaengine.c 2008-05-21 21:48:25.000000000 -0700
@@ -84,7 +84,7 @@
int i;

for_each_possible_cpu(i)
- count += per_cpu_ptr(chan->local, i)->memcpy_count;
+ count += CPU_PTR(chan->local, i)->memcpy_count;

return sprintf(buf, "%lu\n", count);
}
@@ -97,7 +97,7 @@
int i;

for_each_possible_cpu(i)
- count += per_cpu_ptr(chan->local, i)->bytes_transferred;
+ count += CPU_PTR(chan->local, i)->bytes_transferred;

return sprintf(buf, "%lu\n", count);
}
@@ -111,10 +111,8 @@
atomic_read(&chan->refcount.refcount) > 1)
in_use = 1;
else {
- if (local_read(&(per_cpu_ptr(chan->local,
- get_cpu())->refcount)) > 0)
+ if (_CPU_READ(chan->local->refcount) > 0)
in_use = 1;
- put_cpu();
}

return sprintf(buf, "%d\n", in_use);
@@ -227,7 +225,7 @@
int bias = 0x7FFFFFFF;
int i;
for_each_possible_cpu(i)
- bias -= local_read(&per_cpu_ptr(chan->local, i)->refcount);
+ bias -= _CPU_READ(chan->local->refcount);
atomic_sub(bias, &chan->refcount.refcount);
kref_put(&chan->refcount, dma_chan_cleanup);
}
@@ -372,7 +370,8 @@

/* represent channels in sysfs. Probably want devs too */
list_for_each_entry(chan, &device->channels, device_node) {
- chan->local = alloc_percpu(typeof(*chan->local));
+ chan->local = CPU_ALLOC(typeof(*chan->local),
+ GFP_KERNEL | __GFP_ZERO);
if (chan->local == NULL)
continue;

@@ -385,7 +384,7 @@
rc = device_register(&chan->dev);
if (rc) {
chancnt--;
- free_percpu(chan->local);
+ CPU_FREE(chan->local);
chan->local = NULL;
goto err_out;
}
@@ -413,7 +412,7 @@
kref_put(&device->refcount, dma_async_device_cleanup);
device_unregister(&chan->dev);
chancnt--;
- free_percpu(chan->local);
+ CPU_FREE(chan->local);
}
return rc;
}
@@ -490,11 +489,8 @@
tx->callback = NULL;
cookie = tx->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();
-
+ __CPU_ADD(chan->local->bytes_transferred, len);
+ __CPU_INC(chan->local->memcpy_count);
return cookie;
}
EXPORT_SYMBOL(dma_async_memcpy_buf_to_buf);
@@ -536,11 +532,8 @@
tx->callback = NULL;
cookie = tx->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();
-
+ _CPU_ADD(chan->local->bytes_transferred, len);
+ _CPU_INC(chan->local->memcpy_count);
return cookie;
}
EXPORT_SYMBOL(dma_async_memcpy_buf_to_pg);
@@ -585,11 +578,8 @@
tx->callback = NULL;
cookie = tx->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();
-
+ _CPU_ADD(chan->local->bytes_transferred, len);
+ _CPU_INC(chan->local->memcpy_count);
return cookie;
}
EXPORT_SYMBOL(dma_async_memcpy_pg_to_pg);
Index: linux-2.6/include/linux/dmaengine.h
===================================================================
--- linux-2.6.orig/include/linux/dmaengine.h 2008-04-29 14:55:54.000000000 -0700
+++ linux-2.6/include/linux/dmaengine.h 2008-05-21 21:48:25.000000000 -0700
@@ -116,13 +116,13 @@

/**
* struct dma_chan_percpu - the per-CPU part of struct dma_chan
- * @refcount: local_t used for open-coded "bigref" counting
+ * @refcount: int used for open-coded "bigref" counting
* @memcpy_count: transaction counter
* @bytes_transferred: byte counter
*/

struct dma_chan_percpu {
- local_t refcount;
+ int refcount;
/* stats */
unsigned long memcpy_count;
unsigned long bytes_transferred;
@@ -164,20 +164,16 @@
{
if (unlikely(chan->slow_ref))
kref_get(&chan->refcount);
- else {
- local_inc(&(per_cpu_ptr(chan->local, get_cpu())->refcount));
- put_cpu();
- }
+ else
+ _CPU_INC(chan->local->refcount);
}

static inline void dma_chan_put(struct dma_chan *chan)
{
if (unlikely(chan->slow_ref))
kref_put(&chan->refcount, dma_chan_cleanup);
- else {
- local_dec(&(per_cpu_ptr(chan->local, get_cpu())->refcount));
- put_cpu();
- }
+ else
+ _CPU_DEC(chan->local->refcount);
}

/*
--


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