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59 lines
2.0 KiB
59 lines
2.0 KiB
/* 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 <[email protected]> |
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*/ |
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#ifndef __INTEL_SVM_H__ |
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#define __INTEL_SVM_H__ |
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struct device; |
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struct svm_dev_ops { |
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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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#define SVM_REQ_READ (1<<3) |
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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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* The SVM_FLAG_PRIVATE_PASID flag requests a PASID which is *not* the "main" |
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* PASID for the current process. Even if a PASID already exists, a new one |
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* will be allocated. And the PASID allocated with SVM_FLAG_PRIVATE_PASID |
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* will not be given to subsequent callers. This facility allows a driver to |
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* disambiguate between multiple device contexts which access the same MM, |
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* if there is no other way to do so. It should be used sparingly, if at all. |
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*/ |
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#define SVM_FLAG_PRIVATE_PASID (1<<0) |
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/* |
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* The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only |
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* for access to kernel addresses. No IOTLB flushes are automatically done |
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* for kernel mappings; it is valid only for access to the kernel's static |
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* 1:1 mapping of physical memory — not to vmalloc or even module mappings. |
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* A future API addition may permit the use of such ranges, by means of an |
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* explicit IOTLB flush call (akin to the DMA API's unmap method). |
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* |
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* It is unlikely that we will ever hook into flush_tlb_kernel_range() to |
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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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* 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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#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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#define SVM_FLAG_GUEST_PASID (1<<3) |
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#endif /* __INTEL_SVM_H__ */
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