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- #ifndef LINUX_HMM_H
- #define LINUX_HMM_H
- #include <linux/mm.h>
- struct mmu_interval_notifier;
- enum hmm_pfn_flags {
-
- HMM_PFN_VALID = 1UL << (BITS_PER_LONG - 1),
- HMM_PFN_WRITE = 1UL << (BITS_PER_LONG - 2),
- HMM_PFN_ERROR = 1UL << (BITS_PER_LONG - 3),
- HMM_PFN_ORDER_SHIFT = (BITS_PER_LONG - 8),
-
- HMM_PFN_REQ_FAULT = HMM_PFN_VALID,
- HMM_PFN_REQ_WRITE = HMM_PFN_WRITE,
- HMM_PFN_FLAGS = 0xFFUL << HMM_PFN_ORDER_SHIFT,
- };
- static inline struct page *hmm_pfn_to_page(unsigned long hmm_pfn)
- {
- return pfn_to_page(hmm_pfn & ~HMM_PFN_FLAGS);
- }
- static inline unsigned int hmm_pfn_to_map_order(unsigned long hmm_pfn)
- {
- return (hmm_pfn >> HMM_PFN_ORDER_SHIFT) & 0x1F;
- }
- struct hmm_range {
- struct mmu_interval_notifier *notifier;
- unsigned long notifier_seq;
- unsigned long start;
- unsigned long end;
- unsigned long *hmm_pfns;
- unsigned long default_flags;
- unsigned long pfn_flags_mask;
- void *dev_private_owner;
- };
- int hmm_range_fault(struct hmm_range *range);
- #define HMM_RANGE_DEFAULT_TIMEOUT 1000
- #endif
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