linux-kernel - [PATCH v4 07/13] iommu/amd: Restructure code for freeing page table

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Date:   Tue, 15 Dec 2020 01:36:59 -0600
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, will@...nel.org,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v4 07/13] iommu/amd: Restructure code for freeing page table

By consolidate logic into v1_free_pgtable helper function,
which is called from IO page table framework.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 drivers/iommu/amd/amd_iommu.h  |  1 -
 drivers/iommu/amd/io_pgtable.c | 41 ++++++++++++++++++++--------------
 drivers/iommu/amd/iommu.c      | 21 ++++-------------
 3 files changed, 28 insertions(+), 35 deletions(-)

diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
index 1bad42a3c73c..91d098003f12 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -132,7 +132,6 @@ 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,
diff --git a/drivers/iommu/amd/io_pgtable.c b/drivers/iommu/amd/io_pgtable.c
index 345e9bc81fde..dc674e79ddf0 100644
--- a/drivers/iommu/amd/io_pgtable.c
+++ b/drivers/iommu/amd/io_pgtable.c
@@ -163,23 +163,6 @@ static struct page *free_sub_pt(unsigned long root, int mode,
 	return freelist;
 }
 
-void free_pagetable(struct domain_pgtable *pgtable)
-{
-	struct page *freelist = NULL;
-	unsigned long root;
-
-	if (pgtable->mode == PAGE_MODE_NONE)
-		return;
-
-	BUG_ON(pgtable->mode < PAGE_MODE_NONE ||
-	       pgtable->mode > PAGE_MODE_6_LEVEL);
-
-	root = (unsigned long)pgtable->root;
-	freelist = free_sub_pt(root, pgtable->mode, freelist);
-
-	free_page_list(freelist);
-}
-
 void amd_iommu_domain_set_pgtable(struct protection_domain *domain,
 				  u64 *root, int mode)
 {
@@ -528,6 +511,30 @@ unsigned long iommu_unmap_page(struct protection_domain *dom,
  */
 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;
+	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);
+
+	root = (unsigned long)pgtable->root;
+	freelist = free_sub_pt(root, pgtable->mode, freelist);
+
+	free_page_list(freelist);
 }
 
 static struct io_pgtable *v1_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index e823acccc457..37ecedce2c14 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -1903,17 +1903,14 @@ 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);
+	if (domain->iop.pgtbl_cfg.tlb)
+		free_io_pgtable_ops(&domain->iop.iop.ops);
 
 	kfree(domain);
 }
@@ -2302,22 +2299,12 @@ 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);
+	if (domain->iop.pgtbl_cfg.tlb)
+		free_io_pgtable_ops(&domain->iop.iop.ops);
 
 	spin_unlock_irqrestore(&domain->lock, flags);
 }
-- 
2.17.1