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authorDavid Woodhouse <David.Woodhouse@intel.com>2015-10-15 13:59:14 +0100
committerDavid Woodhouse <David.Woodhouse@intel.com>2015-10-15 15:35:32 +0100
commit569e4f7782fb92d0e1b395b5fb01de642dd74dcf (patch)
treeef6aabacf8524f4adbcf7b0b9fbc0c2d3c2b282a /include/linux/intel-svm.h
parent0204a49609824163092c32a8aeb073f7e9acc76d (diff)
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iommu/vt-d: Implement SVM_FLAG_PRIVATE_PASID to allocate unique PASIDs
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'include/linux/intel-svm.h')
-rw-r--r--include/linux/intel-svm.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/intel-svm.h b/include/linux/intel-svm.h
index 239f8a13a332..dd94ab45a4db 100644
--- a/include/linux/intel-svm.h
+++ b/include/linux/intel-svm.h
@@ -31,6 +31,17 @@ struct svm_dev_ops {
#define SVM_REQ_EXEC (1<<1)
#define SVM_REQ_PRIV (1<<0)
+
+/*
+ * The SVM_FLAG_PRIVATE_PASID flag requests a PASID which is *not* the "main"
+ * PASID for the current process. Even if a PASID already exists, a new one
+ * will be allocated. And the PASID allocated with SVM_FLAG_PRIVATE_PASID
+ * will not be given to subsequent callers. This facility allows a driver to
+ * disambiguate between multiple device contexts which access the same MM,
+ * if there is no other way to do so. It should be used sparingly, if at all.
+ */
+#define SVM_FLAG_PRIVATE_PASID (1<<0)
+
/**
* intel_svm_bind_mm() - Bind the current process to a PASID
* @dev: Device to be granted acccess