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iommu/amd: Let free_pagetable() not rely on domain->pt_root 

Use 'struct domain_pgtable' instead to free_pagetable(). This solves
the problem that amd_iommu_domain_direct_map() needs to restore
domain->pt_root after the device table has been updated just to make
free_pagetable release the domain page-table.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20200527115313.7426-4-joro@8bytes.org
This commit is contained in:
Joerg Roedel 2020-05-27 13:53:06 +02:00
parent fb1b6955bb
commit 1226c37074
1 changed files with 16 additions and 20 deletions
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36
drivers/iommu/amd_iommu.c
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@ -1391,20 +1391,19 @@ static struct page *free_sub_pt(unsigned long root, int mode,
return freelist;
}
static void free_pagetable(struct protection_domain *domain)
static void free_pagetable(struct domain_pgtable *pgtable)
{
struct domain_pgtable pgtable;
struct page *freelist = NULL;
unsigned long root;
amd_iommu_domain_get_pgtable(domain, &pgtable);
atomic64_set(&domain->pt_root, 0);
if (pgtable->mode == PAGE_MODE_NONE)
return;
BUG_ON(pgtable.mode < PAGE_MODE_NONE ||
pgtable.mode > PAGE_MODE_6_LEVEL);
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);
root = (unsigned long)pgtable->root;
freelist = free_sub_pt(root, pgtable->mode, freelist);
free_page_list(freelist);
}
@ -1823,12 +1822,16 @@ static void free_gcr3_table(struct protection_domain *domain)
*/
static void dma_ops_domain_free(struct protection_domain *domain)
{
struct domain_pgtable pgtable;
if (!domain)
return;
iommu_put_dma_cookie(&domain->domain);
free_pagetable(domain);
amd_iommu_domain_get_pgtable(domain, &pgtable);
atomic64_set(&domain->pt_root, 0);
free_pagetable(&pgtable);
if (domain->id)
domain_id_free(domain->id);
@ -2496,9 +2499,8 @@ static void amd_iommu_domain_free(struct iommu_domain *dom)
break;
default:
amd_iommu_domain_get_pgtable(domain, &pgtable);
if (pgtable.mode != PAGE_MODE_NONE)
free_pagetable(domain);
atomic64_set(&domain->pt_root, 0);
free_pagetable(&pgtable);
if (domain->flags & PD_IOMMUV2_MASK)
free_gcr3_table(domain);
@ -2796,7 +2798,6 @@ void amd_iommu_domain_direct_map(struct iommu_domain *dom)
struct protection_domain *domain = to_pdomain(dom);
struct domain_pgtable pgtable;
unsigned long flags;
u64 pt_root;
spin_lock_irqsave(&domain->lock, flags);
@ -2804,18 +2805,13 @@ void amd_iommu_domain_direct_map(struct iommu_domain *dom)
amd_iommu_domain_get_pgtable(domain, &pgtable);
/* Update data structure */
pt_root = amd_iommu_domain_encode_pgtable(NULL, PAGE_MODE_NONE);
atomic64_set(&domain->pt_root, pt_root);
atomic64_set(&domain->pt_root, 0);
/* Make changes visible to IOMMUs */
update_domain(domain);
/* Restore old pgtable in domain->ptroot to free page-table */
pt_root = amd_iommu_domain_encode_pgtable(pgtable.root, pgtable.mode);
atomic64_set(&domain->pt_root, pt_root);
/* Page-table is not visible to IOMMU anymore, so free it */
free_pagetable(domain);
free_pagetable(&pgtable);
spin_unlock_irqrestore(&domain->lock, flags);
}