| /* 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__ |
| |
| /* Page Request Queue depth */ |
| #define PRQ_ORDER 4 |
| #define PRQ_RING_MASK ((0x1000 << PRQ_ORDER) - 0x20) |
| #define PRQ_DEPTH ((0x1000 << PRQ_ORDER) >> 5) |
| |
| /* |
| * 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 BIT(0) |
| |
| #endif /* __INTEL_SVM_H__ */ |
