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mm/hmm: use device driver encoding for HMM pfn
Users of hmm_vma_fault() and hmm_vma_get_pfns() provide a flags array and pfn shift value allowing them to define their own encoding for HMM pfn that are fill inside the pfns array of the hmm_range struct. With this device driver can get pfn that match their own private encoding out of HMM without having to do any conversion. [rcampbell@nvidia.com: don't ignore specific pte fault flag in hmm_vma_fault()] Link: http://lkml.kernel.org/r/20180326213009.2460-2-jglisse@redhat.com [rcampbell@nvidia.com: clarify fault logic for device private memory] Link: http://lkml.kernel.org/r/20180326213009.2460-3-jglisse@redhat.com Link: http://lkml.kernel.org/r/20180323005527.758-16-jglisse@redhat.com Signed-off-by: Jérôme Glisse <jglisse@redhat.com> Signed-off-by: Ralph Campbell <rcampbell@nvidia.com> Cc: Evgeny Baskakov <ebaskakov@nvidia.com> Cc: Ralph Campbell <rcampbell@nvidia.com> Cc: Mark Hairgrove <mhairgrove@nvidia.com> Cc: John Hubbard <jhubbard@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jérôme Glisse
Linus Torvalds
parent
2aee09d8c1
commit
f88a1e90c6
@ -80,68 +80,145 @@
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struct hmm;
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/*
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* hmm_pfn_flag_e - HMM flag enums
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*
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* Flags:
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* HMM_PFN_VALID: pfn is valid. It has, at least, read permission.
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* HMM_PFN_WRITE: CPU page table has write permission set
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* HMM_PFN_DEVICE_PRIVATE: private device memory (ZONE_DEVICE)
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*
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* The driver provide a flags array, if driver valid bit for an entry is bit
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* 3 ie (entry & (1 << 3)) is true if entry is valid then driver must provide
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* an array in hmm_range.flags with hmm_range.flags[HMM_PFN_VALID] == 1 << 3.
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* Same logic apply to all flags. This is same idea as vm_page_prot in vma
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* except that this is per device driver rather than per architecture.
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*/
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enum hmm_pfn_flag_e {
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HMM_PFN_VALID = 0,
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HMM_PFN_WRITE,
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HMM_PFN_DEVICE_PRIVATE,
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HMM_PFN_FLAG_MAX
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};
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/*
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* hmm_pfn_value_e - HMM pfn special value
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*
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* Flags:
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* HMM_PFN_ERROR: corresponding CPU page table entry points to poisoned memory
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* HMM_PFN_NONE: corresponding CPU page table entry is pte_none()
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* HMM_PFN_SPECIAL: corresponding CPU page table entry is special; i.e., the
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* result of vm_insert_pfn() or vm_insert_page(). Therefore, it should not
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* be mirrored by a device, because the entry will never have HMM_PFN_VALID
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* set and the pfn value is undefined.
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* HMM_PFN_DEVICE_PRIVATE: unaddressable device memory (ZONE_DEVICE)
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*
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* Driver provide entry value for none entry, error entry and special entry,
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* driver can alias (ie use same value for error and special for instance). It
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* should not alias none and error or special.
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*
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* HMM pfn value returned by hmm_vma_get_pfns() or hmm_vma_fault() will be:
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* hmm_range.values[HMM_PFN_ERROR] if CPU page table entry is poisonous,
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* hmm_range.values[HMM_PFN_NONE] if there is no CPU page table
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* hmm_range.values[HMM_PFN_SPECIAL] if CPU page table entry is a special one
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*/
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#define HMM_PFN_VALID (1 << 0)
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#define HMM_PFN_WRITE (1 << 1)
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#define HMM_PFN_ERROR (1 << 2)
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#define HMM_PFN_SPECIAL (1 << 3)
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#define HMM_PFN_DEVICE_PRIVATE (1 << 4)
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#define HMM_PFN_SHIFT 5
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enum hmm_pfn_value_e {
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HMM_PFN_ERROR,
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HMM_PFN_NONE,
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HMM_PFN_SPECIAL,
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HMM_PFN_VALUE_MAX
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};
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/*
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* struct hmm_range - track invalidation lock on virtual address range
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*
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* @vma: the vm area struct for the range
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* @list: all range lock are on a list
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* @start: range virtual start address (inclusive)
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* @end: range virtual end address (exclusive)
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* @pfns: array of pfns (big enough for the range)
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* @flags: pfn flags to match device driver page table
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* @values: pfn value for some special case (none, special, error, ...)
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* @pfn_shifts: pfn shift value (should be <= PAGE_SHIFT)
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* @valid: pfns array did not change since it has been fill by an HMM function
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*/
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struct hmm_range {
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struct vm_area_struct *vma;
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struct list_head list;
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unsigned long start;
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unsigned long end;
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uint64_t *pfns;
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const uint64_t *flags;
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const uint64_t *values;
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uint8_t pfn_shift;
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bool valid;
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};
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/*
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* hmm_pfn_to_page() - return struct page pointed to by a valid HMM pfn
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* @range: range use to decode HMM pfn value
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* @pfn: HMM pfn value to get corresponding struct page from
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* Returns: struct page pointer if pfn is a valid HMM pfn, NULL otherwise
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*
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* If the HMM pfn is valid (ie valid flag set) then return the struct page
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* matching the pfn value stored in the HMM pfn. Otherwise return NULL.
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*/
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static inline struct page *hmm_pfn_to_page(uint64_t pfn)
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static inline struct page *hmm_pfn_to_page(const struct hmm_range *range,
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uint64_t pfn)
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{
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if (!(pfn & HMM_PFN_VALID))
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if (pfn == range->values[HMM_PFN_NONE])
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return NULL;
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return pfn_to_page(pfn >> HMM_PFN_SHIFT);
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if (pfn == range->values[HMM_PFN_ERROR])
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return NULL;
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if (pfn == range->values[HMM_PFN_SPECIAL])
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return NULL;
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if (!(pfn & range->flags[HMM_PFN_VALID]))
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return NULL;
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return pfn_to_page(pfn >> range->pfn_shift);
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}
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/*
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* hmm_pfn_to_pfn() - return pfn value store in a HMM pfn
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* @range: range use to decode HMM pfn value
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* @pfn: HMM pfn value to extract pfn from
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* Returns: pfn value if HMM pfn is valid, -1UL otherwise
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*/
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static inline unsigned long hmm_pfn_to_pfn(uint64_t pfn)
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static inline unsigned long hmm_pfn_to_pfn(const struct hmm_range *range,
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uint64_t pfn)
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{
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if (!(pfn & HMM_PFN_VALID))
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if (pfn == range->values[HMM_PFN_NONE])
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return -1UL;
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return (pfn >> HMM_PFN_SHIFT);
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if (pfn == range->values[HMM_PFN_ERROR])
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return -1UL;
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if (pfn == range->values[HMM_PFN_SPECIAL])
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return -1UL;
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if (!(pfn & range->flags[HMM_PFN_VALID]))
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return -1UL;
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return (pfn >> range->pfn_shift);
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}
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/*
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* hmm_pfn_from_page() - create a valid HMM pfn value from struct page
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* @range: range use to encode HMM pfn value
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* @page: struct page pointer for which to create the HMM pfn
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* Returns: valid HMM pfn for the page
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*/
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static inline uint64_t hmm_pfn_from_page(struct page *page)
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static inline uint64_t hmm_pfn_from_page(const struct hmm_range *range,
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struct page *page)
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{
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return (page_to_pfn(page) << HMM_PFN_SHIFT) | HMM_PFN_VALID;
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return (page_to_pfn(page) << range->pfn_shift) |
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range->flags[HMM_PFN_VALID];
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}
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/*
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* hmm_pfn_from_pfn() - create a valid HMM pfn value from pfn
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* @range: range use to encode HMM pfn value
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* @pfn: pfn value for which to create the HMM pfn
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* Returns: valid HMM pfn for the pfn
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*/
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static inline uint64_t hmm_pfn_from_pfn(unsigned long pfn)
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static inline uint64_t hmm_pfn_from_pfn(const struct hmm_range *range,
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unsigned long pfn)
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{
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return (pfn << HMM_PFN_SHIFT) | HMM_PFN_VALID;
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return (pfn << range->pfn_shift) |
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range->flags[HMM_PFN_VALID];
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}
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@ -263,25 +340,6 @@ int hmm_mirror_register(struct hmm_mirror *mirror, struct mm_struct *mm);
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void hmm_mirror_unregister(struct hmm_mirror *mirror);
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/*
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* struct hmm_range - track invalidation lock on virtual address range
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*
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* @vma: the vm area struct for the range
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* @list: all range lock are on a list
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* @start: range virtual start address (inclusive)
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* @end: range virtual end address (exclusive)
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* @pfns: array of pfns (big enough for the range)
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* @valid: pfns array did not change since it has been fill by an HMM function
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*/
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struct hmm_range {
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struct vm_area_struct *vma;
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struct list_head list;
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unsigned long start;
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unsigned long end;
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uint64_t *pfns;
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bool valid;
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};
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/*
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* To snapshot the CPU page table, call hmm_vma_get_pfns(), then take a device
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* driver lock that serializes device page table updates, then call
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99
mm/hmm.c
99
mm/hmm.c
@ -306,6 +306,7 @@ static int hmm_vma_do_fault(struct mm_walk *walk, unsigned long addr,
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{
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unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_REMOTE;
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struct hmm_vma_walk *hmm_vma_walk = walk->private;
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struct hmm_range *range = hmm_vma_walk->range;
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struct vm_area_struct *vma = walk->vma;
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int r;
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@ -315,7 +316,7 @@ static int hmm_vma_do_fault(struct mm_walk *walk, unsigned long addr,
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if (r & VM_FAULT_RETRY)
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return -EBUSY;
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if (r & VM_FAULT_ERROR) {
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*pfn = HMM_PFN_ERROR;
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*pfn = range->values[HMM_PFN_ERROR];
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return -EFAULT;
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}
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@ -333,7 +334,7 @@ static int hmm_pfns_bad(unsigned long addr,
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i = (addr - range->start) >> PAGE_SHIFT;
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for (; addr < end; addr += PAGE_SIZE, i++)
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pfns[i] = HMM_PFN_ERROR;
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pfns[i] = range->values[HMM_PFN_ERROR];
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return 0;
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}
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@ -362,7 +363,7 @@ static int hmm_vma_walk_hole_(unsigned long addr, unsigned long end,
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hmm_vma_walk->last = addr;
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i = (addr - range->start) >> PAGE_SHIFT;
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for (; addr < end; addr += PAGE_SIZE, i++) {
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pfns[i] = 0;
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pfns[i] = range->values[HMM_PFN_NONE];
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if (fault || write_fault) {
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int ret;
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@ -380,24 +381,31 @@ static inline void hmm_pte_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
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uint64_t pfns, uint64_t cpu_flags,
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bool *fault, bool *write_fault)
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{
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struct hmm_range *range = hmm_vma_walk->range;
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*fault = *write_fault = false;
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if (!hmm_vma_walk->fault)
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return;
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/* We aren't ask to do anything ... */
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if (!(pfns & HMM_PFN_VALID))
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if (!(pfns & range->flags[HMM_PFN_VALID]))
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return;
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/* If CPU page table is not valid then we need to fault */
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*fault = cpu_flags & HMM_PFN_VALID;
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/* Need to write fault ? */
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if ((pfns & HMM_PFN_WRITE) && !(cpu_flags & HMM_PFN_WRITE)) {
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*fault = *write_fault = false;
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/* If this is device memory than only fault if explicitly requested */
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if ((cpu_flags & range->flags[HMM_PFN_DEVICE_PRIVATE])) {
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/* Do we fault on device memory ? */
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if (pfns & range->flags[HMM_PFN_DEVICE_PRIVATE]) {
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*write_fault = pfns & range->flags[HMM_PFN_WRITE];
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*fault = true;
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}
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return;
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}
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/* Do we fault on device memory ? */
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if ((pfns & HMM_PFN_DEVICE_PRIVATE) &&
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(cpu_flags & HMM_PFN_DEVICE_PRIVATE)) {
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*write_fault = pfns & HMM_PFN_WRITE;
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/* If CPU page table is not valid then we need to fault */
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*fault = !(cpu_flags & range->flags[HMM_PFN_VALID]);
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/* Need to write fault ? */
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if ((pfns & range->flags[HMM_PFN_WRITE]) &&
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!(cpu_flags & range->flags[HMM_PFN_WRITE])) {
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*write_fault = true;
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*fault = true;
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}
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}
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@ -439,13 +447,13 @@ static int hmm_vma_walk_hole(unsigned long addr, unsigned long end,
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return hmm_vma_walk_hole_(addr, end, fault, write_fault, walk);
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}
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static inline uint64_t pmd_to_hmm_pfn_flags(pmd_t pmd)
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static inline uint64_t pmd_to_hmm_pfn_flags(struct hmm_range *range, pmd_t pmd)
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{
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if (pmd_protnone(pmd))
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return 0;
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return pmd_write(pmd) ? HMM_PFN_VALID |
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HMM_PFN_WRITE :
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HMM_PFN_VALID;
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return pmd_write(pmd) ? range->flags[HMM_PFN_VALID] |
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range->flags[HMM_PFN_WRITE] :
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range->flags[HMM_PFN_VALID];
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}
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static int hmm_vma_handle_pmd(struct mm_walk *walk,
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@ -455,12 +463,13 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk,
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pmd_t pmd)
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{
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struct hmm_vma_walk *hmm_vma_walk = walk->private;
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struct hmm_range *range = hmm_vma_walk->range;
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unsigned long pfn, npages, i;
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uint64_t flag = 0, cpu_flags;
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bool fault, write_fault;
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uint64_t cpu_flags;
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npages = (end - addr) >> PAGE_SHIFT;
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cpu_flags = pmd_to_hmm_pfn_flags(pmd);
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cpu_flags = pmd_to_hmm_pfn_flags(range, pmd);
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hmm_range_need_fault(hmm_vma_walk, pfns, npages, cpu_flags,
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&fault, &write_fault);
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@ -468,20 +477,19 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk,
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return hmm_vma_walk_hole_(addr, end, fault, write_fault, walk);
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pfn = pmd_pfn(pmd) + pte_index(addr);
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flag |= pmd_write(pmd) ? HMM_PFN_WRITE : 0;
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for (i = 0; addr < end; addr += PAGE_SIZE, i++, pfn++)
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pfns[i] = hmm_pfn_from_pfn(pfn) | flag;
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pfns[i] = hmm_pfn_from_pfn(range, pfn) | cpu_flags;
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hmm_vma_walk->last = end;
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return 0;
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}
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static inline uint64_t pte_to_hmm_pfn_flags(pte_t pte)
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static inline uint64_t pte_to_hmm_pfn_flags(struct hmm_range *range, pte_t pte)
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{
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if (pte_none(pte) || !pte_present(pte))
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return 0;
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return pte_write(pte) ? HMM_PFN_VALID |
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HMM_PFN_WRITE :
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HMM_PFN_VALID;
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return pte_write(pte) ? range->flags[HMM_PFN_VALID] |
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range->flags[HMM_PFN_WRITE] :
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range->flags[HMM_PFN_VALID];
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}
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static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
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@ -489,14 +497,16 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
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uint64_t *pfn)
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{
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struct hmm_vma_walk *hmm_vma_walk = walk->private;
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struct hmm_range *range = hmm_vma_walk->range;
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struct vm_area_struct *vma = walk->vma;
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bool fault, write_fault;
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uint64_t cpu_flags;
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pte_t pte = *ptep;
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uint64_t orig_pfn = *pfn;
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*pfn = 0;
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cpu_flags = pte_to_hmm_pfn_flags(pte);
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hmm_pte_need_fault(hmm_vma_walk, *pfn, cpu_flags,
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*pfn = range->values[HMM_PFN_NONE];
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cpu_flags = pte_to_hmm_pfn_flags(range, pte);
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hmm_pte_need_fault(hmm_vma_walk, orig_pfn, cpu_flags,
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&fault, &write_fault);
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if (pte_none(pte)) {
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@ -519,11 +529,16 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
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* device and report anything else as error.
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*/
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if (is_device_private_entry(entry)) {
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cpu_flags = HMM_PFN_VALID | HMM_PFN_DEVICE_PRIVATE;
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cpu_flags = range->flags[HMM_PFN_VALID] |
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range->flags[HMM_PFN_DEVICE_PRIVATE];
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cpu_flags |= is_write_device_private_entry(entry) ?
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HMM_PFN_WRITE : 0;
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*pfn = hmm_pfn_from_pfn(swp_offset(entry));
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*pfn |= HMM_PFN_DEVICE_PRIVATE;
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range->flags[HMM_PFN_WRITE] : 0;
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hmm_pte_need_fault(hmm_vma_walk, orig_pfn, cpu_flags,
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&fault, &write_fault);
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if (fault || write_fault)
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goto fault;
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*pfn = hmm_pfn_from_pfn(range, swp_offset(entry));
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*pfn |= cpu_flags;
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return 0;
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}
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@ -539,14 +554,14 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
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}
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/* Report error for everything else */
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*pfn = HMM_PFN_ERROR;
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*pfn = range->values[HMM_PFN_ERROR];
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return -EFAULT;
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}
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if (fault || write_fault)
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goto fault;
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*pfn = hmm_pfn_from_pfn(pte_pfn(pte)) | cpu_flags;
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*pfn = hmm_pfn_from_pfn(range, pte_pfn(pte)) | cpu_flags;
|
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return 0;
|
||||
|
||||
fault:
|
||||
@ -615,12 +630,13 @@ again:
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void hmm_pfns_clear(uint64_t *pfns,
|
||||
static void hmm_pfns_clear(struct hmm_range *range,
|
||||
uint64_t *pfns,
|
||||
unsigned long addr,
|
||||
unsigned long end)
|
||||
{
|
||||
for (; addr < end; addr += PAGE_SIZE, pfns++)
|
||||
*pfns = 0;
|
||||
*pfns = range->values[HMM_PFN_NONE];
|
||||
}
|
||||
|
||||
static void hmm_pfns_special(struct hmm_range *range)
|
||||
@ -628,7 +644,7 @@ static void hmm_pfns_special(struct hmm_range *range)
|
||||
unsigned long addr = range->start, i = 0;
|
||||
|
||||
for (; addr < range->end; addr += PAGE_SIZE, i++)
|
||||
range->pfns[i] = HMM_PFN_SPECIAL;
|
||||
range->pfns[i] = range->values[HMM_PFN_SPECIAL];
|
||||
}
|
||||
|
||||
/*
|
||||
@ -681,7 +697,7 @@ int hmm_vma_get_pfns(struct hmm_range *range)
|
||||
* write without read access are not supported by HMM, because
|
||||
* operations such has atomic access would not work.
|
||||
*/
|
||||
hmm_pfns_clear(range->pfns, range->start, range->end);
|
||||
hmm_pfns_clear(range, range->pfns, range->start, range->end);
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
@ -834,7 +850,7 @@ int hmm_vma_fault(struct hmm_range *range, bool block)
|
||||
|
||||
hmm = hmm_register(vma->vm_mm);
|
||||
if (!hmm) {
|
||||
hmm_pfns_clear(range->pfns, range->start, range->end);
|
||||
hmm_pfns_clear(range, range->pfns, range->start, range->end);
|
||||
return -ENOMEM;
|
||||
}
|
||||
/* Caller must have registered a mirror using hmm_mirror_register() */
|
||||
@ -854,7 +870,7 @@ int hmm_vma_fault(struct hmm_range *range, bool block)
|
||||
* write without read access are not supported by HMM, because
|
||||
* operations such has atomic access would not work.
|
||||
*/
|
||||
hmm_pfns_clear(range->pfns, range->start, range->end);
|
||||
hmm_pfns_clear(range, range->pfns, range->start, range->end);
|
||||
return -EPERM;
|
||||
}
|
||||
|
||||
@ -887,7 +903,8 @@ int hmm_vma_fault(struct hmm_range *range, bool block)
|
||||
unsigned long i;
|
||||
|
||||
i = (hmm_vma_walk.last - range->start) >> PAGE_SHIFT;
|
||||
hmm_pfns_clear(&range->pfns[i], hmm_vma_walk.last, range->end);
|
||||
hmm_pfns_clear(range, &range->pfns[i], hmm_vma_walk.last,
|
||||
range->end);
|
||||
hmm_vma_range_done(range);
|
||||
}
|
||||
return ret;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user