@@ -2189,14 +2189,15 @@ static int amd_iommu_attach_device(struct iommu_domain *dom,
return ret;
}
-static void amd_iommu_iotlb_sync_map(struct iommu_domain *dom,
- unsigned long iova, size_t size)
+static int amd_iommu_iotlb_sync_map(struct iommu_domain *dom,
+ unsigned long iova, size_t size)
{
struct protection_domain *domain = to_pdomain(dom);
struct io_pgtable_ops *ops = &domain->iop.iop.ops;
if (ops->map_pages)
domain_flush_np_cache(domain, iova, size);
+ return 0;
}
static int amd_iommu_map_pages(struct iommu_domain *dom, unsigned long iova,
@@ -344,10 +344,11 @@ static void apple_dart_iotlb_sync(struct iommu_domain *domain,
apple_dart_domain_flush_tlb(to_dart_domain(domain));
}
-static void apple_dart_iotlb_sync_map(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+static int apple_dart_iotlb_sync_map(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
{
apple_dart_domain_flush_tlb(to_dart_domain(domain));
+ return 0;
}
static phys_addr_t apple_dart_iova_to_phys(struct iommu_domain *domain,
@@ -4699,8 +4699,8 @@ static bool risky_device(struct pci_dev *pdev)
return false;
}
-static void intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+static int intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
{
struct dmar_domain *dmar_domain = to_dmar_domain(domain);
unsigned long pages = aligned_nrpages(iova, size);
@@ -4710,6 +4710,7 @@ static void intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
xa_for_each(&dmar_domain->iommu_array, i, info)
__mapping_notify_one(info->iommu, dmar_domain, pfn, pages);
+ return 0;
}
const struct iommu_ops intel_iommu_ops = {
@@ -2300,8 +2300,17 @@ static int _iommu_map(struct iommu_domain *domain, unsigned long iova,
int ret;
ret = __iommu_map(domain, iova, paddr, size, prot, gfp);
- if (ret == 0 && ops->iotlb_sync_map)
- ops->iotlb_sync_map(domain, iova, size);
+ if (ret == 0 && ops->iotlb_sync_map) {
+ ret = ops->iotlb_sync_map(domain, iova, size);
+ if (ret)
+ goto out_err;
+ }
+
+ return ret;
+
+out_err:
+ /* undo mappings already done */
+ iommu_unmap(domain, iova, size);
return ret;
}
@@ -2449,8 +2458,11 @@ static ssize_t __iommu_map_sg(struct iommu_domain *domain, unsigned long iova,
sg = sg_next(sg);
}
- if (ops->iotlb_sync_map)
- ops->iotlb_sync_map(domain, iova, mapped);
+ if (ops->iotlb_sync_map) {
+ ret = ops->iotlb_sync_map(domain, iova, mapped);
+ if (ret)
+ goto out_err;
+ }
return mapped;
out_err:
@@ -484,12 +484,13 @@ static int msm_iommu_map(struct iommu_domain *domain, unsigned long iova,
return ret;
}
-static void msm_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
- size_t size)
+static int msm_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
+ size_t size)
{
struct msm_priv *priv = to_msm_priv(domain);
__flush_iotlb_range(iova, size, SZ_4K, false, priv);
+ return 0;
}
static size_t msm_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
@@ -749,12 +749,13 @@ static void mtk_iommu_iotlb_sync(struct iommu_domain *domain,
mtk_iommu_tlb_flush_range_sync(gather->start, length, dom->bank);
}
-static void mtk_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
- size_t size)
+static int mtk_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
+ size_t size)
{
struct mtk_iommu_domain *dom = to_mtk_domain(domain);
mtk_iommu_tlb_flush_range_sync(iova, size, dom->bank);
+ return 0;
}
static phys_addr_t mtk_iommu_iova_to_phys(struct iommu_domain *domain,
@@ -210,6 +210,14 @@ static void s390_iommu_release_device(struct device *dev)
__s390_iommu_detach_device(zdev);
}
+
+static int zpci_refresh_all(struct zpci_dev *zdev)
+{
+ return zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
+ zdev->end_dma - zdev->start_dma + 1);
+
+}
+
static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
@@ -217,8 +225,7 @@ static void s390_iommu_flush_iotlb_all(struct iommu_domain *domain)
rcu_read_lock();
list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
- zpci_refresh_trans((u64)zdev->fh << 32, zdev->start_dma,
- zdev->end_dma - zdev->start_dma + 1);
+ zpci_refresh_all(zdev);
}
rcu_read_unlock();
}
@@ -242,20 +249,32 @@ static void s390_iommu_iotlb_sync(struct iommu_domain *domain,
rcu_read_unlock();
}
-static void s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
+static int s390_iommu_iotlb_sync_map(struct iommu_domain *domain,
unsigned long iova, size_t size)
{
struct s390_domain *s390_domain = to_s390_domain(domain);
struct zpci_dev *zdev;
+ int ret = 0;
rcu_read_lock();
list_for_each_entry_rcu(zdev, &s390_domain->devices, iommu_list) {
if (!zdev->tlb_refresh)
continue;
- zpci_refresh_trans((u64)zdev->fh << 32,
- iova, size);
+ ret = zpci_refresh_trans((u64)zdev->fh << 32,
+ iova, size);
+ /*
+ * let the hypervisor disover invalidated entries
+ * allowing it to free IOVAs and unpin pages
+ */
+ if (ret == -ENOMEM) {
+ ret = zpci_refresh_all(zdev);
+ if (ret)
+ break;
+ }
}
rcu_read_unlock();
+
+ return ret;
}
static int s390_iommu_validate_trans(struct s390_domain *s390_domain,
@@ -329,8 +329,8 @@ static size_t sprd_iommu_unmap(struct iommu_domain *domain, unsigned long iova,
return 0;
}
-static void sprd_iommu_sync_map(struct iommu_domain *domain,
- unsigned long iova, size_t size)
+static int sprd_iommu_sync_map(struct iommu_domain *domain,
+ unsigned long iova, size_t size)
{
struct sprd_iommu_domain *dom = to_sprd_domain(domain);
unsigned int reg;
@@ -342,6 +342,7 @@ static void sprd_iommu_sync_map(struct iommu_domain *domain,
/* clear IOMMU TLB buffer after page table updated */
sprd_iommu_write(dom->sdev, reg, 0xffffffff);
+ return 0;
}
static void sprd_iommu_sync(struct iommu_domain *domain,
@@ -252,10 +252,11 @@ static int gart_iommu_of_xlate(struct device *dev,
return 0;
}
-static void gart_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
- size_t size)
+static int gart_iommu_sync_map(struct iommu_domain *domain, unsigned long iova,
+ size_t size)
{
FLUSH_GART_REGS(gart_handle);
+ return 0;
}
static void gart_iommu_sync(struct iommu_domain *domain,
@@ -300,8 +300,8 @@ struct iommu_domain_ops {
struct iommu_iotlb_gather *iotlb_gather);
void (*flush_iotlb_all)(struct iommu_domain *domain);
- void (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
- size_t size);
+ int (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
+ size_t size);
void (*iotlb_sync)(struct iommu_domain *domain,
struct iommu_iotlb_gather *iotlb_gather);
On s390 .iotlb_sync_map is used to sync mappings to an underlying hypervisor by letting the hypervisor inspect the synced IOVA range and updating its shadow table. This however means that it can fail as the hypervisor may run out of resources. This can be due to the hypervisor being unable to pin guest pages, due to a limit on concurrently mapped addresses such as vfio_iommu_type1.dma_entry_limit or other resources. Either way such a failure to sync a mapping should result in a DMA_MAPPING_EROR. Now especially when running with batched IOTLB flushes for unmap it may be that some IOVAs have already been invalidated but not yet synced via .iotlb_sync_map. Thus if the hypervisor indicates running out of resources, first do a global flush allowing the hypervisor to free resources associated with these mappings and only if that also fails report this error to callers. Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> --- v1 -> v2: - Add missing return in gart_iommu_sync_map() (Jason) drivers/iommu/amd/iommu.c | 5 +++-- drivers/iommu/apple-dart.c | 5 +++-- drivers/iommu/intel/iommu.c | 5 +++-- drivers/iommu/iommu.c | 20 ++++++++++++++++---- drivers/iommu/msm_iommu.c | 5 +++-- drivers/iommu/mtk_iommu.c | 5 +++-- drivers/iommu/s390-iommu.c | 29 ++++++++++++++++++++++++----- drivers/iommu/sprd-iommu.c | 5 +++-- drivers/iommu/tegra-gart.c | 5 +++-- include/linux/iommu.h | 4 ++-- 10 files changed, 63 insertions(+), 25 deletions(-)