Pasid table memory allocation could return failure due to memory
shortage. Limit the pasid table size to 1MiB because current 8MiB
contiguous physical memory allocation can be hard to come by. W/o
a PASID table, the device could continue to work with only shared
virtual memory impacted. So, let's go ahead with context mapping
even the memory allocation for pasid table failed.
Fixes: cc580e41260d ("iommu/vt-d: Per PCI device pasid table interfaces")
Cc: Ashok Raj <[email protected]>
Cc: Jacob Pan <[email protected]>
Cc: Mika Westerberg <[email protected]>
Reported-and-tested-by: Pelton Kyle D <[email protected]>
Signed-off-by: Lu Baolu <[email protected]>
---
drivers/iommu/intel-iommu.c | 6 +++---
drivers/iommu/intel-pasid.h | 2 +-
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 5f3f10cf9d9d..bedc801b06a0 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2540,9 +2540,9 @@ static struct dmar_domain
*dmar_insert_one_dev_info(struct intel_iommu *iommu,
if (dev && dev_is_pci(dev) && info->pasid_supported) {
ret = intel_pasid_alloc_table(dev);
if (ret) {
- __dmar_remove_one_dev_info(info);
- spin_unlock_irqrestore(&device_domain_lock, flags);
- return NULL;
+ pr_warn("No pasid table for %s, pasid disabled\n",
+ dev_name(dev));
+ info->pasid_supported = 0;
}
}
spin_unlock_irqrestore(&device_domain_lock, flags);
diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h
index 1c05ed6fc5a5..1fb5e12b029a 100644
--- a/drivers/iommu/intel-pasid.h
+++ b/drivers/iommu/intel-pasid.h
@@ -11,7 +11,7 @@
#define __INTEL_PASID_H
#define PASID_MIN 0x1
-#define PASID_MAX 0x100000
+#define PASID_MAX 0x20000
struct pasid_entry {
u64 val;
--
2.17.1
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