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iommu/amd: Collect page-table pages in freelist 

Collect all pages that belong to a page-table in a list and
free them after the tree has been traversed. This allows to
implement safer page-table updates in subsequent patches.
Also move the functions for page-table freeing a bit upwards
in the file so that they are usable from the iommu_map() path.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2018-11-09 12:07:06 +01:00
parent ccda4af0f4
commit ac3a7092eb
1 changed files with 83 additions and 61 deletions
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144
drivers/iommu/amd_iommu.c
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@ -1317,6 +1317,89 @@ static void domain_flush_devices(struct protection_domain *domain)
*
****************************************************************************/
static void free_page_list(struct page *freelist)
{
while (freelist != NULL) {
unsigned long p = (unsigned long)page_address(freelist);
freelist = freelist->freelist;
free_page(p);
}
}
static struct page *free_pt_page(unsigned long pt, struct page *freelist)
{
struct page *p = virt_to_page((void *)pt);
p->freelist = freelist;
return p;
}
#define DEFINE_FREE_PT_FN(LVL, FN) \
static struct page *free_pt_##LVL (unsigned long __pt, struct page *freelist) \
{ \
unsigned long p; \
u64 *pt; \
int i; \
\
pt = (u64 *)__pt; \
\
for (i = 0; i < 512; ++i) { \
/* PTE present? */ \
if (!IOMMU_PTE_PRESENT(pt[i])) \
continue; \
\
/* Large PTE? */ \
if (PM_PTE_LEVEL(pt[i]) == 0 || \
PM_PTE_LEVEL(pt[i]) == 7) \
continue; \
\
p = (unsigned long)IOMMU_PTE_PAGE(pt[i]); \
freelist = FN(p, freelist); \
} \
\
return free_pt_page((unsigned long)pt, freelist); \
}
DEFINE_FREE_PT_FN(l2, free_pt_page)
DEFINE_FREE_PT_FN(l3, free_pt_l2)
DEFINE_FREE_PT_FN(l4, free_pt_l3)
DEFINE_FREE_PT_FN(l5, free_pt_l4)
DEFINE_FREE_PT_FN(l6, free_pt_l5)
static void free_pagetable(struct protection_domain *domain)
{
unsigned long root = (unsigned long)domain->pt_root;
struct page *freelist = NULL;
switch (domain->mode) {
case PAGE_MODE_NONE:
break;
case PAGE_MODE_1_LEVEL:
freelist = free_pt_page(root, freelist);
break;
case PAGE_MODE_2_LEVEL:
freelist = free_pt_l2(root, freelist);
break;
case PAGE_MODE_3_LEVEL:
freelist = free_pt_l3(root, freelist);
break;
case PAGE_MODE_4_LEVEL:
freelist = free_pt_l4(root, freelist);
break;
case PAGE_MODE_5_LEVEL:
freelist = free_pt_l5(root, freelist);
break;
case PAGE_MODE_6_LEVEL:
freelist = free_pt_l6(root, freelist);
break;
default:
BUG();
}
free_page_list(freelist);
}
/*
* This function is used to add another level to an IO page table. Adding
* another level increases the size of the address space by 9 bits to a size up
@ -1638,67 +1721,6 @@ static void domain_id_free(int id)
spin_unlock(&pd_bitmap_lock);
}
#define DEFINE_FREE_PT_FN(LVL, FN) \
static void free_pt_##LVL (unsigned long __pt) \
{ \
unsigned long p; \
u64 *pt; \
int i; \
\
pt = (u64 *)__pt; \
\
for (i = 0; i < 512; ++i) { \
/* PTE present? */ \
if (!IOMMU_PTE_PRESENT(pt[i])) \
continue; \
\
/* Large PTE? */ \
if (PM_PTE_LEVEL(pt[i]) == 0 || \
PM_PTE_LEVEL(pt[i]) == 7) \
continue; \
\
p = (unsigned long)IOMMU_PTE_PAGE(pt[i]); \
FN(p); \
} \
free_page((unsigned long)pt); \
}
DEFINE_FREE_PT_FN(l2, free_page)
DEFINE_FREE_PT_FN(l3, free_pt_l2)
DEFINE_FREE_PT_FN(l4, free_pt_l3)
DEFINE_FREE_PT_FN(l5, free_pt_l4)
DEFINE_FREE_PT_FN(l6, free_pt_l5)
static void free_pagetable(struct protection_domain *domain)
{
unsigned long root = (unsigned long)domain->pt_root;
switch (domain->mode) {
case PAGE_MODE_NONE:
break;
case PAGE_MODE_1_LEVEL:
free_page(root);
break;
case PAGE_MODE_2_LEVEL:
free_pt_l2(root);
break;
case PAGE_MODE_3_LEVEL:
free_pt_l3(root);
break;
case PAGE_MODE_4_LEVEL:
free_pt_l4(root);
break;
case PAGE_MODE_5_LEVEL:
free_pt_l5(root);
break;
case PAGE_MODE_6_LEVEL:
free_pt_l6(root);
break;
default:
BUG();
}
}
static void free_gcr3_tbl_level1(u64 *tbl)
{
u64 *ptr;