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- /* SPDX-License-Identifier: GPL-2.0-only */
- /*
- * Copyright © 2015 Intel Corporation.
- *
- * Authors: David Woodhouse <David.Woodhouse@intel.com>
- */
- #ifndef __INTEL_SVM_H__
- #define __INTEL_SVM_H__
- struct device;
- struct svm_dev_ops {
- void (*fault_cb)(struct device *dev, u32 pasid, u64 address,
- void *private, int rwxp, int response);
- };
- /* Values for rxwp in fault_cb callback */
- #define SVM_REQ_READ (1<<3)
- #define SVM_REQ_WRITE (1<<2)
- #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)
- /*
- * The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only
- * for access to kernel addresses. No IOTLB flushes are automatically done
- * for kernel mappings; it is valid only for access to the kernel's static
- * 1:1 mapping of physical memory — not to vmalloc or even module mappings.
- * A future API addition may permit the use of such ranges, by means of an
- * explicit IOTLB flush call (akin to the DMA API's unmap method).
- *
- * It is unlikely that we will ever hook into flush_tlb_kernel_range() to
- * do such IOTLB flushes automatically.
- */
- #define SVM_FLAG_SUPERVISOR_MODE (1<<1)
- /*
- * The SVM_FLAG_GUEST_MODE flag is used when a PASID bind is for guest
- * processes. Compared to the host bind, the primary differences are:
- * 1. mm life cycle management
- * 2. fault reporting
- */
- #define SVM_FLAG_GUEST_MODE (1<<2)
- /*
- * The SVM_FLAG_GUEST_PASID flag is used when a guest has its own PASID space,
- * which requires guest and host PASID translation at both directions.
- */
- #define SVM_FLAG_GUEST_PASID (1<<3)
- #endif /* __INTEL_SVM_H__ */
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