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authorJens Axboe <jens.axboe@oracle.com>2007-10-22 20:01:06 +0200
committerJens Axboe <jens.axboe@oracle.com>2007-10-22 21:20:03 +0200
commitd6ec084200c37683278c821338f74ddf21ab80f5 (patch)
tree931a112061e3a861768384b8b6ea20fdd35bd41b /include
parent18dabf473e15850c0dbc8ff13ac1e2806d542c15 (diff)
Add CONFIG_DEBUG_SG sg validation
Add a Kconfig entry which will toggle some sanity checks on the sg entry and tables. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'include')
-rw-r--r--include/asm-alpha/scatterlist.h3
-rw-r--r--include/asm-arm/scatterlist.h3
-rw-r--r--include/asm-avr32/scatterlist.h3
-rw-r--r--include/asm-blackfin/scatterlist.h3
-rw-r--r--include/asm-cris/scatterlist.h3
-rw-r--r--include/asm-frv/scatterlist.h3
-rw-r--r--include/asm-h8300/scatterlist.h3
-rw-r--r--include/asm-ia64/scatterlist.h3
-rw-r--r--include/asm-m32r/scatterlist.h3
-rw-r--r--include/asm-m68k/scatterlist.h3
-rw-r--r--include/asm-m68knommu/scatterlist.h3
-rw-r--r--include/asm-mips/scatterlist.h3
-rw-r--r--include/asm-parisc/scatterlist.h3
-rw-r--r--include/asm-powerpc/scatterlist.h3
-rw-r--r--include/asm-s390/scatterlist.h3
-rw-r--r--include/asm-sh/scatterlist.h3
-rw-r--r--include/asm-sh64/scatterlist.h3
-rw-r--r--include/asm-sparc/scatterlist.h3
-rw-r--r--include/asm-sparc64/scatterlist.h3
-rw-r--r--include/asm-v850/scatterlist.h3
-rw-r--r--include/asm-x86/scatterlist_32.h3
-rw-r--r--include/asm-x86/scatterlist_64.h3
-rw-r--r--include/asm-xtensa/scatterlist.h3
-rw-r--r--include/linux/scatterlist.h22
24 files changed, 91 insertions, 0 deletions
diff --git a/include/asm-alpha/scatterlist.h b/include/asm-alpha/scatterlist.h
index b7647063bd5..440747ca634 100644
--- a/include/asm-alpha/scatterlist.h
+++ b/include/asm-alpha/scatterlist.h
@@ -5,6 +5,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
diff --git a/include/asm-arm/scatterlist.h b/include/asm-arm/scatterlist.h
index ab1d85dd023..ca0a37d0340 100644
--- a/include/asm-arm/scatterlist.h
+++ b/include/asm-arm/scatterlist.h
@@ -5,6 +5,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset; /* buffer offset */
dma_addr_t dma_address; /* dma address */
diff --git a/include/asm-avr32/scatterlist.h b/include/asm-avr32/scatterlist.h
index 1356f29d89f..377320e3bd1 100644
--- a/include/asm-avr32/scatterlist.h
+++ b/include/asm-avr32/scatterlist.h
@@ -4,6 +4,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
dma_addr_t dma_address;
diff --git a/include/asm-blackfin/scatterlist.h b/include/asm-blackfin/scatterlist.h
index 384af549e5b..32128d53469 100644
--- a/include/asm-blackfin/scatterlist.h
+++ b/include/asm-blackfin/scatterlist.h
@@ -4,6 +4,9 @@
#include <linux/mm.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
dma_addr_t dma_address;
diff --git a/include/asm-cris/scatterlist.h b/include/asm-cris/scatterlist.h
index 5a8a83440d3..faff53ad1f9 100644
--- a/include/asm-cris/scatterlist.h
+++ b/include/asm-cris/scatterlist.h
@@ -2,6 +2,9 @@
#define __ASM_CRIS_SCATTERLIST_H
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
char * address; /* Location data is to be transferred to */
unsigned int length;
diff --git a/include/asm-frv/scatterlist.h b/include/asm-frv/scatterlist.h
index 53dade7b2e1..f7da007b763 100644
--- a/include/asm-frv/scatterlist.h
+++ b/include/asm-frv/scatterlist.h
@@ -22,6 +22,9 @@
* and that's it. There's no excuse for not highmem enabling YOUR driver. /jens
*/
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset; /* for highmem, page offset */
diff --git a/include/asm-h8300/scatterlist.h b/include/asm-h8300/scatterlist.h
index 7e41983d6b2..d3ecdd87ac9 100644
--- a/include/asm-h8300/scatterlist.h
+++ b/include/asm-h8300/scatterlist.h
@@ -4,6 +4,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
dma_addr_t dma_address;
diff --git a/include/asm-ia64/scatterlist.h b/include/asm-ia64/scatterlist.h
index 2f76ce30496..d6f57874041 100644
--- a/include/asm-ia64/scatterlist.h
+++ b/include/asm-ia64/scatterlist.h
@@ -9,6 +9,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
unsigned int length; /* buffer length */
diff --git a/include/asm-m32r/scatterlist.h b/include/asm-m32r/scatterlist.h
index 33b4b4d2c89..1ed372c73d0 100644
--- a/include/asm-m32r/scatterlist.h
+++ b/include/asm-m32r/scatterlist.h
@@ -4,6 +4,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
char * address; /* Location data is to be transferred to, NULL for
* highmem page */
unsigned long page_link;
diff --git a/include/asm-m68k/scatterlist.h b/include/asm-m68k/scatterlist.h
index e06bb891048..d3a7a0edfec 100644
--- a/include/asm-m68k/scatterlist.h
+++ b/include/asm-m68k/scatterlist.h
@@ -4,6 +4,9 @@
#include <linux/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
unsigned int length;
diff --git a/include/asm-m68knommu/scatterlist.h b/include/asm-m68knommu/scatterlist.h
index 28bed41dc80..10942840e88 100644
--- a/include/asm-m68knommu/scatterlist.h
+++ b/include/asm-m68knommu/scatterlist.h
@@ -5,6 +5,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
dma_addr_t dma_address;
diff --git a/include/asm-mips/scatterlist.h b/include/asm-mips/scatterlist.h
index 787797cdb0a..83d69fe17c9 100644
--- a/include/asm-mips/scatterlist.h
+++ b/include/asm-mips/scatterlist.h
@@ -4,6 +4,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
dma_addr_t dma_address;
diff --git a/include/asm-parisc/scatterlist.h b/include/asm-parisc/scatterlist.h
index 26da9146fff..cd3cfdf8228 100644
--- a/include/asm-parisc/scatterlist.h
+++ b/include/asm-parisc/scatterlist.h
@@ -5,6 +5,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
diff --git a/include/asm-powerpc/scatterlist.h b/include/asm-powerpc/scatterlist.h
index b9f1dbc2484..fcf7d55afe4 100644
--- a/include/asm-powerpc/scatterlist.h
+++ b/include/asm-powerpc/scatterlist.h
@@ -14,6 +14,9 @@
#include <asm/dma.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
unsigned int length;
diff --git a/include/asm-s390/scatterlist.h b/include/asm-s390/scatterlist.h
index eb3948690d6..29ec8e28c8d 100644
--- a/include/asm-s390/scatterlist.h
+++ b/include/asm-s390/scatterlist.h
@@ -2,6 +2,9 @@
#define _ASMS390_SCATTERLIST_H
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
unsigned int length;
diff --git a/include/asm-sh/scatterlist.h b/include/asm-sh/scatterlist.h
index bc7c809e16f..a7d0d1856a9 100644
--- a/include/asm-sh/scatterlist.h
+++ b/include/asm-sh/scatterlist.h
@@ -4,6 +4,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;/* for highmem, page offset */
dma_addr_t dma_address;
diff --git a/include/asm-sh64/scatterlist.h b/include/asm-sh64/scatterlist.h
index 0afd856e218..5109251970e 100644
--- a/include/asm-sh64/scatterlist.h
+++ b/include/asm-sh64/scatterlist.h
@@ -14,6 +14,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;/* for highmem, page offset */
dma_addr_t dma_address;
diff --git a/include/asm-sparc/scatterlist.h b/include/asm-sparc/scatterlist.h
index 45b16f1072b..e08d3d775b0 100644
--- a/include/asm-sparc/scatterlist.h
+++ b/include/asm-sparc/scatterlist.h
@@ -5,6 +5,9 @@
#include <linux/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
diff --git a/include/asm-sparc64/scatterlist.h b/include/asm-sparc64/scatterlist.h
index 4cbaf7c6b0b..6df23f070b1 100644
--- a/include/asm-sparc64/scatterlist.h
+++ b/include/asm-sparc64/scatterlist.h
@@ -6,6 +6,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
diff --git a/include/asm-v850/scatterlist.h b/include/asm-v850/scatterlist.h
index db91febc210..02d27b3fb06 100644
--- a/include/asm-v850/scatterlist.h
+++ b/include/asm-v850/scatterlist.h
@@ -17,6 +17,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned offset;
dma_addr_t dma_address;
diff --git a/include/asm-x86/scatterlist_32.h b/include/asm-x86/scatterlist_32.h
index 140a5b37fa7..0e7d997a34b 100644
--- a/include/asm-x86/scatterlist_32.h
+++ b/include/asm-x86/scatterlist_32.h
@@ -4,6 +4,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
dma_addr_t dma_address;
diff --git a/include/asm-x86/scatterlist_64.h b/include/asm-x86/scatterlist_64.h
index e3447846e03..1847c72befe 100644
--- a/include/asm-x86/scatterlist_64.h
+++ b/include/asm-x86/scatterlist_64.h
@@ -4,6 +4,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
unsigned int length;
diff --git a/include/asm-xtensa/scatterlist.h b/include/asm-xtensa/scatterlist.h
index 3b8aba5d2c6..810080bb0a2 100644
--- a/include/asm-xtensa/scatterlist.h
+++ b/include/asm-xtensa/scatterlist.h
@@ -14,6 +14,9 @@
#include <asm/types.h>
struct scatterlist {
+#ifdef CONFIG_DEBUG_SG
+ unsigned long sg_magic;
+#endif
unsigned long page_link;
unsigned int offset;
dma_addr_t dma_address;
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index c6136e8a7f5..42daf5e1526 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -23,6 +23,8 @@
*
*/
+#define SG_MAGIC 0x87654321
+
/**
* sg_set_page - Set sg entry to point at given page
* @sg: SG entry
@@ -39,6 +41,9 @@ static inline void sg_set_page(struct scatterlist *sg, struct page *page)
{
unsigned long page_link = sg->page_link & 0x3;
+#ifdef CONFIG_DEBUG_SG
+ BUG_ON(sg->sg_magic != SG_MAGIC);
+#endif
sg->page_link = page_link | (unsigned long) page;
}
@@ -81,6 +86,9 @@ static inline void sg_set_buf(struct scatterlist *sg, const void *buf,
**/
static inline struct scatterlist *sg_next(struct scatterlist *sg)
{
+#ifdef CONFIG_DEBUG_SG
+ BUG_ON(sg->sg_magic != SG_MAGIC);
+#endif
if (sg_is_last(sg))
return NULL;
@@ -124,6 +132,10 @@ static inline struct scatterlist *sg_last(struct scatterlist *sgl,
ret = sg;
#endif
+#ifdef CONFIG_DEBUG_SG
+ BUG_ON(sgl[0].sg_magic != SG_MAGIC);
+ BUG_ON(!sg_is_last(ret));
+#endif
return ret;
}
@@ -180,6 +192,9 @@ static inline void sg_init_one(struct scatterlist *sg, const void *buf,
unsigned int buflen)
{
memset(sg, 0, sizeof(*sg));
+#ifdef CONFIG_DEBUG_SG
+ sg->sg_magic = SG_MAGIC;
+#endif
sg_mark_end(sg, 1);
sg_set_buf(sg, buf, buflen);
}
@@ -198,6 +213,13 @@ static inline void sg_init_table(struct scatterlist *sgl, unsigned int nents)
{
memset(sgl, 0, sizeof(*sgl) * nents);
sg_mark_end(sgl, nents);
+#ifdef CONFIG_DEBUG_SG
+ {
+ int i;
+ for (i = 0; i < nents; i++)
+ sgl[i].sg_magic = SG_MAGIC;
+ }
+#endif
}
/**
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