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linux-sg2042
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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>
This commit is contained in:
Jens Axboe 2007-10-22 20:01:06 +02:00
parent 18dabf473e
commit d6ec084200
25 changed files with 101 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/asm-alpha/scatterlist.h
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@ -5,6 +5,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;

3
include/asm-arm/scatterlist.h
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@ -5,6 +5,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; /* buffer offset */ unsigned int offset; /* buffer offset */
dma_addr_t dma_address; /* dma address */ dma_addr_t dma_address; /* dma address */

3
include/asm-avr32/scatterlist.h
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@ -4,6 +4,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
dma_addr_t dma_address; dma_addr_t dma_address;

3
include/asm-blackfin/scatterlist.h
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@ -4,6 +4,9 @@
#include <linux/mm.h> #include <linux/mm.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
dma_addr_t dma_address; dma_addr_t dma_address;

3
include/asm-cris/scatterlist.h
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@ -2,6 +2,9 @@
#define __ASM_CRIS_SCATTERLIST_H #define __ASM_CRIS_SCATTERLIST_H
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
char * address; /* Location data is to be transferred to */ char * address; /* Location data is to be transferred to */
unsigned int length; unsigned int length;

3
include/asm-frv/scatterlist.h
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@ -22,6 +22,9 @@
* and that's it. There's no excuse for not highmem enabling YOUR driver. /jens * and that's it. There's no excuse for not highmem enabling YOUR driver. /jens
*/ */
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; /* for highmem, page offset */ unsigned int offset; /* for highmem, page offset */

3
include/asm-h8300/scatterlist.h
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@ -4,6 +4,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
dma_addr_t dma_address; dma_addr_t dma_address;

3
include/asm-ia64/scatterlist.h
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@ -9,6 +9,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
unsigned int length; /* buffer length */ unsigned int length; /* buffer length */

3
include/asm-m32r/scatterlist.h
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@ -4,6 +4,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
char * address; /* Location data is to be transferred to, NULL for char * address; /* Location data is to be transferred to, NULL for
* highmem page */ * highmem page */
unsigned long page_link; unsigned long page_link;

3
include/asm-m68k/scatterlist.h
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@ -4,6 +4,9 @@
#include <linux/types.h> #include <linux/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
unsigned int length; unsigned int length;

3
include/asm-m68knommu/scatterlist.h
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@ -5,6 +5,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
dma_addr_t dma_address; dma_addr_t dma_address;

3
include/asm-mips/scatterlist.h
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@ -4,6 +4,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
dma_addr_t dma_address; dma_addr_t dma_address;

3
include/asm-parisc/scatterlist.h
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@ -5,6 +5,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;

3
include/asm-powerpc/scatterlist.h
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@ -14,6 +14,9 @@
#include <asm/dma.h> #include <asm/dma.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
unsigned int length; unsigned int length;

3
include/asm-s390/scatterlist.h
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@ -2,6 +2,9 @@
#define _ASMS390_SCATTERLIST_H #define _ASMS390_SCATTERLIST_H
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
unsigned int length; unsigned int length;

3
include/asm-sh/scatterlist.h
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@ -4,6 +4,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset;/* for highmem, page offset */ unsigned int offset;/* for highmem, page offset */
dma_addr_t dma_address; dma_addr_t dma_address;

3
include/asm-sh64/scatterlist.h
View File

@ -14,6 +14,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset;/* for highmem, page offset */ unsigned int offset;/* for highmem, page offset */
dma_addr_t dma_address; dma_addr_t dma_address;

3
include/asm-sparc/scatterlist.h
View File

@ -5,6 +5,9 @@
#include <linux/types.h> #include <linux/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;

3
include/asm-sparc64/scatterlist.h
View File

@ -6,6 +6,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;

3
include/asm-v850/scatterlist.h
View File

@ -17,6 +17,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned offset; unsigned offset;
dma_addr_t dma_address; dma_addr_t dma_address;

3
include/asm-x86/scatterlist_32.h
View File

@ -4,6 +4,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
dma_addr_t dma_address; dma_addr_t dma_address;

3
include/asm-x86/scatterlist_64.h
View File

@ -4,6 +4,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
unsigned int length; unsigned int length;

3
include/asm-xtensa/scatterlist.h
View File

@ -14,6 +14,9 @@
#include <asm/types.h> #include <asm/types.h>
struct scatterlist { struct scatterlist {
#ifdef CONFIG_DEBUG_SG
unsigned long sg_magic;
#endif
unsigned long page_link; unsigned long page_link;
unsigned int offset; unsigned int offset;
dma_addr_t dma_address; dma_addr_t dma_address;

22
include/linux/scatterlist.h
View File

@ -23,6 +23,8 @@
* *
*/ */
#define SG_MAGIC 0x87654321
/** /**
* sg_set_page - Set sg entry to point at given page * sg_set_page - Set sg entry to point at given page
* @sg: SG entry * @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; 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; 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) 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)) if (sg_is_last(sg))
return NULL; return NULL;
@ -123,6 +131,10 @@ static inline struct scatterlist *sg_last(struct scatterlist *sgl,
for_each_sg(sgl, sg, nents, i) for_each_sg(sgl, sg, nents, i)
ret = sg; ret = sg;
#endif
#ifdef CONFIG_DEBUG_SG
BUG_ON(sgl[0].sg_magic != SG_MAGIC);
BUG_ON(!sg_is_last(ret));
#endif #endif
return ret; return ret;
} }
@ -180,6 +192,9 @@ static inline void sg_init_one(struct scatterlist *sg, const void *buf,
unsigned int buflen) unsigned int buflen)
{ {
memset(sg, 0, sizeof(*sg)); memset(sg, 0, sizeof(*sg));
#ifdef CONFIG_DEBUG_SG
sg->sg_magic = SG_MAGIC;
#endif
sg_mark_end(sg, 1); sg_mark_end(sg, 1);
sg_set_buf(sg, buf, buflen); 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); memset(sgl, 0, sizeof(*sgl) * nents);
sg_mark_end(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
} }
/** /**

10
lib/Kconfig.debug
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@ -389,6 +389,16 @@ config DEBUG_LIST
If unsure, say N. If unsure, say N.
config DEBUG_SG
bool "Debug SG table operations"
depends on DEBUG_KERNEL
help
Enable this to turn on checks on scatter-gather tables. This can
help find problems with drivers that do not properly initialize
their sg tables.
If unsure, say N.
config FRAME_POINTER config FRAME_POINTER
bool "Compile the kernel with frame pointers" bool "Compile the kernel with frame pointers"
depends on DEBUG_KERNEL && (X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390 || AVR32 || SUPERH || BFIN) depends on DEBUG_KERNEL && (X86 || CRIS || M68K || M68KNOMMU || FRV || UML || S390 || AVR32 || SUPERH || BFIN)