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Subject[PATCH v2 07/13] iommu/amd: Restructure code for freeing page table
Date
Introduce amd_iommu_free_pgtable helper function, which consolidates
logic for freeing page table.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
---
drivers/iommu/amd/amd_iommu.h | 2 +-
drivers/iommu/amd/io_pgtable.c | 12 +++++++++++-
drivers/iommu/amd/iommu.c | 19 ++-----------------
3 files changed, 14 insertions(+), 19 deletions(-)

diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
index ee7ff4d827e1..8dff7d85be79 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -123,7 +123,6 @@ static inline void amd_iommu_apply_ivrs_quirks(void) { }
#endif

/* TODO: These are temporary and will be removed once fully transition */
-extern void free_pagetable(struct domain_pgtable *pgtable);
extern int iommu_map_page(struct protection_domain *dom,
unsigned long bus_addr,
unsigned long phys_addr,
@@ -140,4 +139,5 @@ extern void amd_iommu_domain_get_pgtable(struct protection_domain *domain,
struct domain_pgtable *pgtable);
extern void amd_iommu_domain_set_pgtable(struct protection_domain *domain,
u64 *root, int mode);
+extern void amd_iommu_free_pgtable(struct amd_io_pgtable *pgtable);
#endif
diff --git a/drivers/iommu/amd/io_pgtable.c b/drivers/iommu/amd/io_pgtable.c
index 7fd3dd9db197..0c886419166b 100644
--- a/drivers/iommu/amd/io_pgtable.c
+++ b/drivers/iommu/amd/io_pgtable.c
@@ -136,14 +136,24 @@ static struct page *free_sub_pt(unsigned long root, int mode,
return freelist;
}

-void free_pagetable(struct domain_pgtable *pgtable)
+void amd_iommu_free_pgtable(struct amd_io_pgtable *pgtable)
{
+ struct protection_domain *dom;
struct page *freelist = NULL;
unsigned long root;

if (pgtable->mode == PAGE_MODE_NONE)
return;

+ dom = container_of(pgtable, struct protection_domain, iop);
+
+ /* Update data structure */
+ amd_iommu_domain_clr_pt_root(dom);
+
+ /* Make changes visible to IOMMUs */
+ amd_iommu_domain_update(dom);
+
+ /* Page-table is not visible to IOMMU anymore, so free it */
BUG_ON(pgtable->mode < PAGE_MODE_NONE ||
pgtable->mode > PAGE_MODE_6_LEVEL);

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 4d65f64236b6..cbbea7b952fb 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -1882,17 +1882,13 @@ static void cleanup_domain(struct protection_domain *domain)

static void protection_domain_free(struct protection_domain *domain)
{
- struct domain_pgtable pgtable;
-
if (!domain)
return;

if (domain->id)
domain_id_free(domain->id);

- amd_iommu_domain_get_pgtable(domain, &pgtable);
- amd_iommu_domain_clr_pt_root(domain);
- free_pagetable(&pgtable);
+ amd_iommu_free_pgtable(&domain->iop);

kfree(domain);
}
@@ -2281,22 +2277,11 @@ EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);
void amd_iommu_domain_direct_map(struct iommu_domain *dom)
{
struct protection_domain *domain = to_pdomain(dom);
- struct domain_pgtable pgtable;
unsigned long flags;

spin_lock_irqsave(&domain->lock, flags);

- /* First save pgtable configuration*/
- amd_iommu_domain_get_pgtable(domain, &pgtable);
-
- /* Remove page-table from domain */
- amd_iommu_domain_clr_pt_root(domain);
-
- /* Make changes visible to IOMMUs */
- amd_iommu_domain_update(domain);
-
- /* Page-table is not visible to IOMMU anymore, so free it */
- free_pagetable(&pgtable);
+ amd_iommu_free_pgtable(&domain->iop);

spin_unlock_irqrestore(&domain->lock, flags);
}
--
2.17.1
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