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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/intel-svm.h
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@@ -1,16 +1,8 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * Copyright © 2015 Intel Corporation.
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  *
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  * Authors: David Woodhouse <David.Woodhouse@intel.com>
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms and conditions of the GNU General Public License,
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- * version 2, as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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- * more details.
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  */
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 #ifndef __INTEL_SVM_H__
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@@ -19,8 +11,8 @@
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 struct device;
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 struct svm_dev_ops {
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-	void (*fault_cb)(struct device *dev, int pasid, u64 address,
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-			 u32 private, int rwxp, int response);
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+	void (*fault_cb)(struct device *dev, u32 pasid, u64 address,
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+			 void *private, int rwxp, int response);
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 };
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 /* Values for rxwp in fault_cb callback */
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@@ -28,7 +20,6 @@
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 #define SVM_REQ_WRITE	(1<<2)
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 #define SVM_REQ_EXEC	(1<<1)
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 #define SVM_REQ_PRIV	(1<<0)
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-
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 /*
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  * The SVM_FLAG_PRIVATE_PASID flag requests a PASID which is *not* the "main"
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@@ -52,90 +43,17 @@
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  * do such IOTLB flushes automatically.
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  */
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 #define SVM_FLAG_SUPERVISOR_MODE	(1<<1)
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-
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-#ifdef CONFIG_INTEL_IOMMU_SVM
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-
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-/**
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- * intel_svm_bind_mm() - Bind the current process to a PASID
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- * @dev:	Device to be granted acccess
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- * @pasid:	Address for allocated PASID
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- * @flags:	Flags. Later for requesting supervisor mode, etc.
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- * @ops:	Callbacks to device driver
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- *
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- * This function attempts to enable PASID support for the given device.
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- * If the @pasid argument is non-%NULL, a PASID is allocated for access
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- * to the MM of the current process.
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- *
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- * By using a %NULL value for the @pasid argument, this function can
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- * be used to simply validate that PASID support is available for the
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- * given device — i.e. that it is behind an IOMMU which has the
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- * requisite support, and is enabled.
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- *
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- * Page faults are handled transparently by the IOMMU code, and there
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- * should be no need for the device driver to be involved. If a page
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- * fault cannot be handled (i.e. is an invalid address rather than
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- * just needs paging in), then the page request will be completed by
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- * the core IOMMU code with appropriate status, and the device itself
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- * can then report the resulting fault to its driver via whatever
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- * mechanism is appropriate.
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- *
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- * Multiple calls from the same process may result in the same PASID
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- * being re-used. A reference count is kept.
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+/*
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+ * The SVM_FLAG_GUEST_MODE flag is used when a PASID bind is for guest
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+ * processes. Compared to the host bind, the primary differences are:
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+ * 1. mm life cycle management
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+ * 2. fault reporting
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  */
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-extern int intel_svm_bind_mm(struct device *dev, int *pasid, int flags,
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-			     struct svm_dev_ops *ops);
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-
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-/**
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- * intel_svm_unbind_mm() - Unbind a specified PASID
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- * @dev:	Device for which PASID was allocated
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- * @pasid:	PASID value to be unbound
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- *
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- * This function allows a PASID to be retired when the device no
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- * longer requires access to the address space of a given process.
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- *
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- * If the use count for the PASID in question reaches zero, the
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- * PASID is revoked and may no longer be used by hardware.
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- *
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- * Device drivers are required to ensure that no access (including
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- * page requests) is currently outstanding for the PASID in question,
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- * before calling this function.
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+#define SVM_FLAG_GUEST_MODE		(1<<2)
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+/*
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+ * The SVM_FLAG_GUEST_PASID flag is used when a guest has its own PASID space,
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+ * which requires guest and host PASID translation at both directions.
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  */
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-extern int intel_svm_unbind_mm(struct device *dev, int pasid);
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-
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-/**
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- * intel_svm_is_pasid_valid() - check if pasid is valid
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- * @dev:	Device for which PASID was allocated
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- * @pasid:	PASID value to be checked
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- *
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- * This function checks if the specified pasid is still valid. A
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- * valid pasid means the backing mm is still having a valid user.
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- * For kernel callers init_mm is always valid. for other mm, if mm->mm_users
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- * is non-zero, it is valid.
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- *
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- * returns -EINVAL if invalid pasid, 0 if pasid ref count is invalid
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- * 1 if pasid is valid.
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- */
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-extern int intel_svm_is_pasid_valid(struct device *dev, int pasid);
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-
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-#else /* CONFIG_INTEL_IOMMU_SVM */
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-
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-static inline int intel_svm_bind_mm(struct device *dev, int *pasid,
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-				    int flags, struct svm_dev_ops *ops)
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-{
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-	return -ENOSYS;
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-}
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-
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-static inline int intel_svm_unbind_mm(struct device *dev, int pasid)
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-{
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-	BUG();
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-}
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-
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-static inline int intel_svm_is_pasid_valid(struct device *dev, int pasid)
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-{
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-	return -EINVAL;
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-}
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-#endif /* CONFIG_INTEL_IOMMU_SVM */
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-
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-#define intel_svm_available(dev) (!intel_svm_bind_mm((dev), NULL, 0, NULL))
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+#define SVM_FLAG_GUEST_PASID		(1<<3)
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 #endif /* __INTEL_SVM_H__ */