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iommu/vt-d: Handle memory shortage on pasid table allocation

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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.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107783
Fixes: cc580e4126 ("iommu/vt-d: Per PCI device pasid table interfaces")

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Reported-and-tested-by: Pelton Kyle D <kyle.d.pelton@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2018-09-08 09:42:53 +08:00 committed by Joerg Roedel
parent 74bc2abca7
commit be9e6598ae
2 changed files with 4 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/iommu/intel-iommu.c
View file

@ -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);

2
drivers/iommu/intel-pasid.h
View file

@ -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;