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Diffstat (limited to 'include/linux/intel-svm.h')
| -rw-r--r-- | include/linux/intel-svm.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/linux/intel-svm.h b/include/linux/intel-svm.h new file mode 100644 index 000000000..207ef06ba --- /dev/null +++ b/include/linux/intel-svm.h @@ -0,0 +1,29 @@ +/* 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__ */ |