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Date: Thu, 05 Feb 2009 22:44:02 +0000
From: David Woodhouse <dwmw2@...radead.org>
To: Joerg Roedel <joerg.roedel@....com>
Cc: Ingo Molnar <mingo@...e.hu>, Ingo Molnar <mingo@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>, netdev@...r.kernel.org,
iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/10] DMA-API debugging facility
On Fri, 2008-11-21 at 18:27 +0100, Joerg Roedel wrote:
> On Fri, Nov 21, 2008 at 05:24:29PM +0000, David Woodhouse wrote:
> > On Fri, 2008-11-21 at 18:20 +0100, Joerg Roedel wrote:
> > > Ok, I will move the generic bits to lib/ and include/linux and let
> > > architectures decide if they want to use it.
> >
> > Once you've done that, I'll try to hook it up on PowerPC to make sure it
> > works there.
>
> Ok, cool. Thanks
This builds; I haven't actually tried booting it yet. Will do that in
the morning.
I'm not so fond of the way each architecture gets to define
PREALLOC_DMA_DEBUG_ENTRIES for itself... and also call dma_debug_init(),
for that matter. Couldn't we do that in lib/dma-debug.c directly?
Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 74cc312..11db356 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -124,6 +124,7 @@ config PPC
select USE_GENERIC_SMP_HELPERS if SMP
select HAVE_OPROFILE
select HAVE_SYSCALL_WRAPPERS if PPC64
+ select HAVE_DMA_API_DEBUG
config EARLY_PRINTK
bool
diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index 86cef7d..b49107a 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -13,6 +13,7 @@
/* need struct page definitions */
#include <linux/mm.h>
#include <linux/scatterlist.h>
+#include <linux/dma-debug.h>
#include <linux/dma-attrs.h>
#include <asm/io.h>
@@ -170,12 +171,17 @@ static inline dma_addr_t dma_map_single_attrs(struct device *dev,
struct dma_attrs *attrs)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+ dma_addr_t addr;
BUG_ON(!dma_ops);
- return dma_ops->map_page(dev, virt_to_page(cpu_addr),
+ addr = dma_ops->map_page(dev, virt_to_page(cpu_addr),
(unsigned long)cpu_addr % PAGE_SIZE, size,
direction, attrs);
+ debug_dma_map_page(dev, virt_to_page(cpu_addr),
+ (unsigned long)cpu_addr & PAGE_SIZE, size,
+ direction, addr, true);
+ return addr;
}
static inline void dma_unmap_single_attrs(struct device *dev,
@@ -189,6 +195,7 @@ static inline void dma_unmap_single_attrs(struct device *dev,
BUG_ON(!dma_ops);
dma_ops->unmap_page(dev, dma_addr, size, direction, attrs);
+ debug_dma_unmap_page(dev, dma_addr, size, direction, true);
}
static inline dma_addr_t dma_map_page_attrs(struct device *dev,
@@ -198,10 +205,13 @@ static inline dma_addr_t dma_map_page_attrs(struct device *dev,
struct dma_attrs *attrs)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+ dma_addr_t addr;
BUG_ON(!dma_ops);
- return dma_ops->map_page(dev, page, offset, size, direction, attrs);
+ addr = dma_ops->map_page(dev, page, offset, size, direction, attrs);
+ debug_dma_map_page(dev, page, offset, size, direction, addr, false);
+ return addr;
}
static inline void dma_unmap_page_attrs(struct device *dev,
@@ -215,6 +225,7 @@ static inline void dma_unmap_page_attrs(struct device *dev,
BUG_ON(!dma_ops);
dma_ops->unmap_page(dev, dma_address, size, direction, attrs);
+ debug_dma_unmap_page(dev, dma_address, size, direction, false);
}
static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
@@ -222,9 +233,12 @@ static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sg,
struct dma_attrs *attrs)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+ int ents;
BUG_ON(!dma_ops);
- return dma_ops->map_sg(dev, sg, nents, direction, attrs);
+ ents = dma_ops->map_sg(dev, sg, nents, direction, attrs);
+ debug_dma_map_sg(dev, sg, ents, direction);
+ return ents;
}
static inline void dma_unmap_sg_attrs(struct device *dev,
@@ -237,15 +251,19 @@ static inline void dma_unmap_sg_attrs(struct device *dev,
BUG_ON(!dma_ops);
dma_ops->unmap_sg(dev, sg, nhwentries, direction, attrs);
+ debug_dma_unmap_sg(dev, sg, nhwentries, direction);
}
static inline void *dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
+ void *mem;
BUG_ON(!dma_ops);
- return dma_ops->alloc_coherent(dev, size, dma_handle, flag);
+ mem = dma_ops->alloc_coherent(dev, size, dma_handle, flag);
+ debug_dma_alloc_coherent(dev, size, *dma_handle, mem);
+ return mem;
}
static inline void dma_free_coherent(struct device *dev, size_t size,
@@ -254,6 +272,7 @@ static inline void dma_free_coherent(struct device *dev, size_t size,
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
BUG_ON(!dma_ops);
+ debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
dma_ops->free_coherent(dev, size, cpu_addr, dma_handle);
}
@@ -306,6 +325,8 @@ static inline void dma_sync_single_for_cpu(struct device *dev,
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
BUG_ON(!dma_ops);
+ debug_dma_sync_single_range_for_cpu(dev, dma_handle, 0,
+ size, direction);
dma_ops->sync_single_range_for_cpu(dev, dma_handle, 0,
size, direction);
}
@@ -317,6 +338,8 @@ static inline void dma_sync_single_for_device(struct device *dev,
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
BUG_ON(!dma_ops);
+ debug_dma_sync_single_range_for_device(dev, dma_handle,
+ 0, size, direction);
dma_ops->sync_single_range_for_device(dev, dma_handle,
0, size, direction);
}
@@ -328,6 +351,7 @@ static inline void dma_sync_sg_for_cpu(struct device *dev,
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
BUG_ON(!dma_ops);
+ debug_dma_sync_sg_for_cpu(dev, sgl, nents, direction);
dma_ops->sync_sg_for_cpu(dev, sgl, nents, direction);
}
@@ -338,6 +362,7 @@ static inline void dma_sync_sg_for_device(struct device *dev,
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
BUG_ON(!dma_ops);
+ debug_dma_sync_sg_for_device(dev, sgl, nents, direction);
dma_ops->sync_sg_for_device(dev, sgl, nents, direction);
}
@@ -348,6 +373,8 @@ static inline void dma_sync_single_range_for_cpu(struct device *dev,
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
BUG_ON(!dma_ops);
+ debug_dma_sync_single_range_for_cpu(dev, dma_handle,
+ offset, size, direction);
dma_ops->sync_single_range_for_cpu(dev, dma_handle,
offset, size, direction);
}
@@ -359,6 +386,8 @@ static inline void dma_sync_single_range_for_device(struct device *dev,
struct dma_mapping_ops *dma_ops = get_dma_ops(dev);
BUG_ON(!dma_ops);
+ debug_dma_sync_single_range_for_device(dev, dma_handle, offset,
+ size, direction);
dma_ops->sync_single_range_for_device(dev, dma_handle, offset,
size, direction);
}
@@ -367,36 +396,46 @@ static inline void dma_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction direction)
{
+ debug_dma_sync_single_range_for_cpu(dev, dma_handle, 0,
+ size, direction);
}
static inline void dma_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction direction)
{
+ debug_dma_sync_single_range_for_device(dev, dma_handle,
+ 0, size, direction);
}
static inline void dma_sync_sg_for_cpu(struct device *dev,
struct scatterlist *sgl, int nents,
enum dma_data_direction direction)
{
+ debug_dma_sync_sg_for_cpu(dev, sgl, nents, direction);
}
static inline void dma_sync_sg_for_device(struct device *dev,
struct scatterlist *sgl, int nents,
enum dma_data_direction direction)
{
+ debug_dma_sync_sg_for_device(dev, sgl, nents, direction);
}
static inline void dma_sync_single_range_for_cpu(struct device *dev,
dma_addr_t dma_handle, unsigned long offset, size_t size,
enum dma_data_direction direction)
{
+ debug_dma_sync_single_range_for_cpu(dev, dma_handle,
+ offset, size, direction);
}
static inline void dma_sync_single_range_for_device(struct device *dev,
dma_addr_t dma_handle, unsigned long offset, size_t size,
enum dma_data_direction direction)
{
+ debug_dma_sync_single_range_for_device(dev, dma_handle, offset,
+ size, direction);
}
#endif
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 1c5c8a6..90bb016 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -6,7 +6,9 @@
*/
#include <linux/device.h>
+#include <linux/dma-debug.h>
#include <linux/dma-mapping.h>
+#include <linux/init.h>
#include <asm/bug.h>
#include <asm/abs_addr.h>
@@ -156,3 +158,12 @@ struct dma_mapping_ops dma_direct_ops = {
#endif
};
EXPORT_SYMBOL(dma_direct_ops);
+
+#define PREALLOC_DMA_DEBUG_ENTRIES 8192
+
+static int __init dma_debug_init_ppc(void)
+{
+ dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+ return 0;
+}
+fs_initcall(dma_debug_init_ppc);
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@...el.com Intel Corporation
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