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iommu/amd: Use put_pages_list

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page->freelist is for the use of slab.  We already have the ability
to free a list of pages in the core mm, but it requires the use of a
list_head and for the pages to be chained together through page->lru.
Switch the AMD IOMMU code over to using free_pages_list().

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
[rm: split from original patch, cosmetic tweaks]
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/73af128f651aaa1f38f69e586c66765a88ad2de0.1639753638.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-12-17 15:30:59 +00:00 committed by Joerg Roedel
parent 6b3106e9ba
commit ce00eece69
1 changed files with 18 additions and 32 deletions
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50
drivers/iommu/amd/io_pgtable.c
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@ -74,26 +74,14 @@ static u64 *first_pte_l7(u64 *pte, unsigned long *page_size,
*
****************************************************************************/
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(u64 *pt, struct page *freelist)
static void free_pt_page(u64 *pt, struct list_head *freelist)
{
struct page *p = virt_to_page(pt);
p->freelist = freelist;
return p;
list_add_tail(&p->lru, freelist);
}
static struct page *free_pt_lvl(u64 *pt, struct page *freelist, int lvl)
static void free_pt_lvl(u64 *pt, struct list_head *freelist, int lvl)
{
u64 *p;
int i;
@ -114,22 +102,22 @@ static struct page *free_pt_lvl(u64 *pt, struct page *freelist, int lvl)
*/
p = IOMMU_PTE_PAGE(pt[i]);
if (lvl > 2)
freelist = free_pt_lvl(p, freelist, lvl - 1);
free_pt_lvl(p, freelist, lvl - 1);
else
freelist = free_pt_page(p, freelist);
free_pt_page(p, freelist);
}
return free_pt_page(pt, freelist);
free_pt_page(pt, freelist);
}
static struct page *free_sub_pt(u64 *root, int mode, struct page *freelist)
static void free_sub_pt(u64 *root, int mode, struct list_head *freelist)
{
switch (mode) {
case PAGE_MODE_NONE:
case PAGE_MODE_7_LEVEL:
break;
case PAGE_MODE_1_LEVEL:
freelist = free_pt_page(root, freelist);
free_pt_page(root, freelist);
break;
case PAGE_MODE_2_LEVEL:
case PAGE_MODE_3_LEVEL:
@ -141,8 +129,6 @@ static struct page *free_sub_pt(u64 *root, int mode, struct page *freelist)
default:
BUG();
}
return freelist;
}
void amd_iommu_domain_set_pgtable(struct protection_domain *domain,
@ -350,7 +336,7 @@ static u64 *fetch_pte(struct amd_io_pgtable *pgtable,
return pte;
}
static struct page *free_clear_pte(u64 *pte, u64 pteval, struct page *freelist)
static void free_clear_pte(u64 *pte, u64 pteval, struct list_head *freelist)
{
u64 *pt;
int mode;
@ -361,12 +347,12 @@ static struct page *free_clear_pte(u64 *pte, u64 pteval, struct page *freelist)
}
if (!IOMMU_PTE_PRESENT(pteval))
return freelist;
return;
pt = IOMMU_PTE_PAGE(pteval);
mode = IOMMU_PTE_MODE(pteval);
return free_sub_pt(pt, mode, freelist);
free_sub_pt(pt, mode, freelist);
}
/*
@ -380,7 +366,7 @@ static int iommu_v1_map_page(struct io_pgtable_ops *ops, unsigned long iova,
phys_addr_t paddr, size_t size, int prot, gfp_t gfp)
{
struct protection_domain *dom = io_pgtable_ops_to_domain(ops);
struct page *freelist = NULL;
LIST_HEAD(freelist);
bool updated = false;
u64 __pte, *pte;
int ret, i, count;
@ -400,9 +386,9 @@ static int iommu_v1_map_page(struct io_pgtable_ops *ops, unsigned long iova,
goto out;
for (i = 0; i < count; ++i)
freelist = free_clear_pte(&pte[i], pte[i], freelist);
free_clear_pte(&pte[i], pte[i], &freelist);
if (freelist != NULL)
if (!list_empty(&freelist))
updated = true;
if (count > 1) {
@ -437,7 +423,7 @@ static int iommu_v1_map_page(struct io_pgtable_ops *ops, unsigned long iova,
}
/* Everything flushed out, free pages now */
free_page_list(freelist);
put_pages_list(&freelist);
return ret;
}
@ -499,7 +485,7 @@ static void v1_free_pgtable(struct io_pgtable *iop)
{
struct amd_io_pgtable *pgtable = container_of(iop, struct amd_io_pgtable, iop);
struct protection_domain *dom;
struct page *freelist = NULL;
LIST_HEAD(freelist);
if (pgtable->mode == PAGE_MODE_NONE)
return;
@ -516,9 +502,9 @@ static void v1_free_pgtable(struct io_pgtable *iop)
BUG_ON(pgtable->mode < PAGE_MODE_NONE ||
pgtable->mode > PAGE_MODE_6_LEVEL);
freelist = free_sub_pt(pgtable->root, pgtable->mode, freelist);
free_sub_pt(pgtable->root, pgtable->mode, &freelist);
free_page_list(freelist);
put_pages_list(&freelist);
}
static struct io_pgtable *v1_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)