lkml.org 
[lkml]   [2008]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 07/10] x86: add checks for alloc/free_coherent code
Date
Impact: detect bugs in alloc/free_coherent usage

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/include/asm/dma-mapping.h | 10 +++++-
arch/x86/include/asm/dma_debug.h | 20 +++++++++++++
arch/x86/kernel/pci-dma-debug.c | 56 ++++++++++++++++++++++++++++++++++++
3 files changed, 84 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index c7bdb75..2893adb 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -304,8 +304,12 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
if (!ops->alloc_coherent)
return NULL;

- return ops->alloc_coherent(dev, size, dma_handle,
- dma_alloc_coherent_gfp_flags(dev, gfp));
+ memory = ops->alloc_coherent(dev, size, dma_handle,
+ dma_alloc_coherent_gfp_flags(dev, gfp));
+
+ debug_alloc_coherent(dev, size, *dma_handle, memory);
+
+ return memory;
}

static inline void dma_free_coherent(struct device *dev, size_t size,
@@ -320,6 +324,8 @@ static inline void dma_free_coherent(struct device *dev, size_t size,

if (ops->free_coherent)
ops->free_coherent(dev, size, vaddr, bus);
+
+ debug_free_coherent(dev, size, vaddr, bus);
}

#endif
diff --git a/arch/x86/include/asm/dma_debug.h b/arch/x86/include/asm/dma_debug.h
index ff06d1c..7245e27 100644
--- a/arch/x86/include/asm/dma_debug.h
+++ b/arch/x86/include/asm/dma_debug.h
@@ -59,6 +59,14 @@ extern
void debug_unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems, int dir);

+extern
+void debug_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t dma_addr, void *virt);
+
+extern
+void debug_free_coherent(struct device *dev, size_t size,
+ void *virt, dma_addr_t addr);
+
#else /* CONFIG_DMA_API_DEBUG */

static inline
@@ -90,6 +98,18 @@ void debug_unmap_sg(struct device *dev, struct scatterlist *sglist,
{
}

+static inline
+void debug_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t dma_addr, void *virt)
+{
+}
+
+static inline
+void debug_free_coherent(struct device *dev, size_t size,
+ void *virt, dma_addr_t addr)
+{
+}
+
#endif /* CONFIG_DMA_API_DEBUG */

#endif /* __ASM_X86_DMA_DEBUG */
diff --git a/arch/x86/kernel/pci-dma-debug.c b/arch/x86/kernel/pci-dma-debug.c
index 55ef69a..db5ef9a 100644
--- a/arch/x86/kernel/pci-dma-debug.c
+++ b/arch/x86/kernel/pci-dma-debug.c
@@ -352,3 +352,59 @@ void debug_unmap_sg(struct device *dev, struct scatterlist *sglist,
}
EXPORT_SYMBOL(debug_unmap_sg);

+void debug_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t dma_addr, void *virt)
+{
+ unsigned long flags;
+ struct dma_debug_entry *entry;
+
+ if (dma_addr == bad_dma_address)
+ return;
+
+ entry = dma_entry_alloc();
+ if (!entry)
+ return;
+
+ entry->type = DMA_DEBUG_COHERENT;
+ entry->dev = dev;
+ entry->cpu_addr = virt;
+ entry->size = size;
+ entry->dev_addr = dma_addr;
+ entry->direction = DMA_BIDIRECTIONAL;
+
+ spin_lock_irqsave(&dma_lock, flags);
+ add_dma_entry(entry);
+ spin_unlock_irqrestore(&dma_lock, flags);
+}
+EXPORT_SYMBOL(debug_alloc_coherent);
+
+void debug_free_coherent(struct device *dev, size_t size,
+ void *virt, dma_addr_t addr)
+{
+ unsigned long flags;
+ struct dma_debug_entry ref = {
+ .type = DMA_DEBUG_COHERENT,
+ .dev = dev,
+ .cpu_addr = virt,
+ .dev_addr = addr,
+ .size = size,
+ .direction = DMA_BIDIRECTIONAL,
+ };
+ struct dma_debug_entry *entry;
+
+ if (addr == bad_dma_address)
+ return;
+
+ spin_lock_irqsave(&dma_lock, flags);
+
+ entry = find_dma_entry(&ref);
+
+ if (check_unmap(&ref, entry)) {
+ remove_dma_entry(entry);
+ dma_entry_free(entry);
+ }
+
+ spin_unlock_irqrestore(&dma_lock, flags);
+}
+EXPORT_SYMBOL(debug_free_coherent);
+
--
1.5.6.4



\
 
 \ /
  Last update: 2008-11-21 17:33    [W:1.142 / U:0.064 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site