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Message-Id: <20100413142607V.fujita.tomonori@lab.ntt.co.jp>
Date: Tue, 13 Apr 2010 14:27:04 +0900
From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To: linux@....linux.org.uk
Cc: fujita.tomonori@....ntt.co.jp,
linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dmabounce: fix partial sync in dma_sync_single_*
API
On Mon, 12 Apr 2010 20:35:36 +0100
Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> On Mon, Apr 05, 2010 at 12:39:32PM +0900, FUJITA Tomonori wrote:
> > I don't have arm hardware that uses dmabounce so I can't confirm the
> > problem but seems that dmabounce doesn't work for some drivers...
>
> Patch reviews fine, except for one niggle. I too don't have hardware
> I can test (well, I do except the kernel stopped supporting the UDA1341
> audio codec on the SA1110 Neponset.)
Thanks for reviewing.
> > @@ -171,10 +172,17 @@ find_safe_buffer(struct dmabounce_device_info *device_info, dma_addr_t safe_dma_
> > read_lock_irqsave(&device_info->lock, flags);
> >
> > list_for_each_entry(b, &device_info->safe_buffers, node)
> > - if (b->safe_dma_addr == safe_dma_addr) {
> > - rb = b;
> > - break;
> > - }
> > + if (for_sync) {
> > + if (b->safe_dma_addr <= safe_dma_addr &&
> > + safe_dma_addr < b->safe_dma_addr + b->size) {
> > + rb = b;
> > + break;
> > + }
> > + } else
> > + if (b->safe_dma_addr == safe_dma_addr) {
> > + rb = b;
> > + break;
> > + }
>
> This is the niggle; I don't like this indentation style. If you want to
> indent this if () statement, then please format like this:
>
> } else {
> if (b->safe...) {
> ...
> }
> }
>
> or format it as:
>
> } else if (b->safe...) {
> ...
> }
ok, here's the fixed patch.
=
From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Subject: [PATCH] ARM: dmabounce: fix partial sync in dma_sync_single_* API
Some network drivers do a partial sync with
dma_sync_single_for_{device|cpu}. The dma_addr argument might not be
the same as one as passed into the mapping API.
This adds some tricks to find_safe_buffer() for
dma_sync_single_for_{device|cpu}.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
---
arch/arm/common/dmabounce.c | 30 +++++++++++++++++++++---------
1 files changed, 21 insertions(+), 9 deletions(-)
diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index cc0a932..2e6deec 100644
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -163,7 +163,8 @@ alloc_safe_buffer(struct dmabounce_device_info *device_info, void *ptr,
/* determine if a buffer is from our "safe" pool */
static inline struct safe_buffer *
-find_safe_buffer(struct dmabounce_device_info *device_info, dma_addr_t safe_dma_addr)
+find_safe_buffer(struct dmabounce_device_info *device_info, dma_addr_t safe_dma_addr,
+ int for_sync)
{
struct safe_buffer *b, *rb = NULL;
unsigned long flags;
@@ -171,9 +172,17 @@ find_safe_buffer(struct dmabounce_device_info *device_info, dma_addr_t safe_dma_
read_lock_irqsave(&device_info->lock, flags);
list_for_each_entry(b, &device_info->safe_buffers, node)
- if (b->safe_dma_addr == safe_dma_addr) {
- rb = b;
- break;
+ if (for_sync) {
+ if (b->safe_dma_addr <= safe_dma_addr &&
+ safe_dma_addr < b->safe_dma_addr + b->size) {
+ rb = b;
+ break;
+ }
+ } else {
+ if (b->safe_dma_addr == safe_dma_addr) {
+ rb = b;
+ break;
+ }
}
read_unlock_irqrestore(&device_info->lock, flags);
@@ -205,7 +214,8 @@ free_safe_buffer(struct dmabounce_device_info *device_info, struct safe_buffer *
/* ************************************************** */
static struct safe_buffer *find_safe_buffer_dev(struct device *dev,
- dma_addr_t dma_addr, const char *where)
+ dma_addr_t dma_addr, const char *where,
+ int for_sync)
{
if (!dev || !dev->archdata.dmabounce)
return NULL;
@@ -216,7 +226,7 @@ static struct safe_buffer *find_safe_buffer_dev(struct device *dev,
pr_err("unknown device: Trying to %s invalid mapping\n", where);
return NULL;
}
- return find_safe_buffer(dev->archdata.dmabounce, dma_addr);
+ return find_safe_buffer(dev->archdata.dmabounce, dma_addr, for_sync);
}
static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
@@ -286,7 +296,7 @@ static inline dma_addr_t map_single(struct device *dev, void *ptr, size_t size,
static inline void unmap_single(struct device *dev, dma_addr_t dma_addr,
size_t size, enum dma_data_direction dir)
{
- struct safe_buffer *buf = find_safe_buffer_dev(dev, dma_addr, "unmap");
+ struct safe_buffer *buf = find_safe_buffer_dev(dev, dma_addr, "unmap", 0);
if (buf) {
BUG_ON(buf->size != size);
@@ -398,7 +408,7 @@ int dmabounce_sync_for_cpu(struct device *dev, dma_addr_t addr,
dev_dbg(dev, "%s(dma=%#x,off=%#lx,sz=%zx,dir=%x)\n",
__func__, addr, off, sz, dir);
- buf = find_safe_buffer_dev(dev, addr, __func__);
+ buf = find_safe_buffer_dev(dev, addr, __func__, 1);
if (!buf)
return 1;
@@ -411,6 +421,8 @@ int dmabounce_sync_for_cpu(struct device *dev, dma_addr_t addr,
DO_STATS(dev->archdata.dmabounce->bounce_count++);
if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL) {
+ if (addr != buf->safe_dma_addr)
+ off = addr - buf->safe_dma_addr;
dev_dbg(dev, "%s: copy back safe %p to unsafe %p size %d\n",
__func__, buf->safe + off, buf->ptr + off, sz);
memcpy(buf->ptr + off, buf->safe + off, sz);
@@ -427,7 +439,7 @@ int dmabounce_sync_for_device(struct device *dev, dma_addr_t addr,
dev_dbg(dev, "%s(dma=%#x,off=%#lx,sz=%zx,dir=%x)\n",
__func__, addr, off, sz, dir);
- buf = find_safe_buffer_dev(dev, addr, __func__);
+ buf = find_safe_buffer_dev(dev, addr, __func__, 1);
if (!buf)
return 1;
--
1.6.5
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