mirror of
https://github.com/torvalds/linux.git
synced 2024-12-25 20:32:22 +00:00
90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
|
#include <linux/dma-mapping.h>
|
||
|
#include <asm/iommu_table.h>
|
||
|
#include <linux/string.h>
|
||
|
#include <linux/kallsyms.h>
|
||
|
|
||
|
|
||
|
#define DEBUG 1
|
||
|
|
||
|
static struct iommu_table_entry * __init
|
||
|
find_dependents_of(struct iommu_table_entry *start,
|
||
|
struct iommu_table_entry *finish,
|
||
|
struct iommu_table_entry *q)
|
||
|
{
|
||
|
struct iommu_table_entry *p;
|
||
|
|
||
|
if (!q)
|
||
|
return NULL;
|
||
|
|
||
|
for (p = start; p < finish; p++)
|
||
|
if (p->detect == q->depend)
|
||
|
return p;
|
||
|
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
|
||
|
void __init sort_iommu_table(struct iommu_table_entry *start,
|
||
|
struct iommu_table_entry *finish) {
|
||
|
|
||
|
struct iommu_table_entry *p, *q, tmp;
|
||
|
|
||
|
for (p = start; p < finish; p++) {
|
||
|
again:
|
||
|
q = find_dependents_of(start, finish, p);
|
||
|
/* We are bit sneaky here. We use the memory address to figure
|
||
|
* out if the node we depend on is past our point, if so, swap.
|
||
|
*/
|
||
|
if (q > p) {
|
||
|
tmp = *p;
|
||
|
memmove(p, q, sizeof(*p));
|
||
|
*q = tmp;
|
||
|
goto again;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
}
|
||
|
|
||
|
#ifdef DEBUG
|
||
|
void __init check_iommu_entries(struct iommu_table_entry *start,
|
||
|
struct iommu_table_entry *finish)
|
||
|
{
|
||
|
struct iommu_table_entry *p, *q, *x;
|
||
|
char sym_p[KSYM_SYMBOL_LEN];
|
||
|
char sym_q[KSYM_SYMBOL_LEN];
|
||
|
|
||
|
/* Simple cyclic dependency checker. */
|
||
|
for (p = start; p < finish; p++) {
|
||
|
q = find_dependents_of(start, finish, p);
|
||
|
x = find_dependents_of(start, finish, q);
|
||
|
if (p == x) {
|
||
|
sprint_symbol(sym_p, (unsigned long)p->detect);
|
||
|
sprint_symbol(sym_q, (unsigned long)q->detect);
|
||
|
|
||
|
printk(KERN_ERR "CYCLIC DEPENDENCY FOUND! %s depends" \
|
||
|
" on %s and vice-versa. BREAKING IT.\n",
|
||
|
sym_p, sym_q);
|
||
|
/* Heavy handed way..*/
|
||
|
x->depend = 0;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
for (p = start; p < finish; p++) {
|
||
|
q = find_dependents_of(p, finish, p);
|
||
|
if (q && q > p) {
|
||
|
sprint_symbol(sym_p, (unsigned long)p->detect);
|
||
|
sprint_symbol(sym_q, (unsigned long)q->detect);
|
||
|
|
||
|
printk(KERN_ERR "EXECUTION ORDER INVALID! %s "\
|
||
|
"should be called before %s!\n",
|
||
|
sym_p, sym_q);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
#else
|
||
|
inline void check_iommu_entries(struct iommu_table_entry *start,
|
||
|
struct iommu_table_entry *finish)
|
||
|
{
|
||
|
}
|
||
|
#endif
|