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Diffstat (limited to 'mm/hmm.c')
-rw-r--r--mm/hmm.c160
1 files changed, 76 insertions, 84 deletions
diff --git a/mm/hmm.c b/mm/hmm.c
index 2e975eedb14f..41673a6d8d46 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -37,28 +37,13 @@ enum {
HMM_NEED_ALL_BITS = HMM_NEED_FAULT | HMM_NEED_WRITE_FAULT,
};
-/*
- * hmm_device_entry_from_pfn() - create a valid device entry value from pfn
- * @range: range use to encode HMM pfn value
- * @pfn: pfn value for which to create the device entry
- * Return: valid device entry for the pfn
- */
-static uint64_t hmm_device_entry_from_pfn(const struct hmm_range *range,
- unsigned long pfn)
-{
- return (pfn << range->pfn_shift) | range->flags[HMM_PFN_VALID];
-}
-
static int hmm_pfns_fill(unsigned long addr, unsigned long end,
- struct hmm_range *range, enum hmm_pfn_value_e value)
+ struct hmm_range *range, unsigned long cpu_flags)
{
- uint64_t *pfns = range->pfns;
- unsigned long i;
+ unsigned long i = (addr - range->start) >> PAGE_SHIFT;
- i = (addr - range->start) >> PAGE_SHIFT;
for (; addr < end; addr += PAGE_SIZE, i++)
- pfns[i] = range->values[value];
-
+ range->hmm_pfns[i] = cpu_flags;
return 0;
}
@@ -96,7 +81,8 @@ static int hmm_vma_fault(unsigned long addr, unsigned long end,
}
static unsigned int hmm_pte_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
- uint64_t pfns, uint64_t cpu_flags)
+ unsigned long pfn_req_flags,
+ unsigned long cpu_flags)
{
struct hmm_range *range = hmm_vma_walk->range;
@@ -110,27 +96,28 @@ static unsigned int hmm_pte_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
* waste to have the user pre-fill the pfn arrays with a default
* flags value.
*/
- pfns = (pfns & range->pfn_flags_mask) | range->default_flags;
+ pfn_req_flags &= range->pfn_flags_mask;
+ pfn_req_flags |= range->default_flags;
/* We aren't ask to do anything ... */
- if (!(pfns & range->flags[HMM_PFN_VALID]))
+ if (!(pfn_req_flags & HMM_PFN_REQ_FAULT))
return 0;
/* Need to write fault ? */
- if ((pfns & range->flags[HMM_PFN_WRITE]) &&
- !(cpu_flags & range->flags[HMM_PFN_WRITE]))
+ if ((pfn_req_flags & HMM_PFN_REQ_WRITE) &&
+ !(cpu_flags & HMM_PFN_WRITE))
return HMM_NEED_FAULT | HMM_NEED_WRITE_FAULT;
/* If CPU page table is not valid then we need to fault */
- if (!(cpu_flags & range->flags[HMM_PFN_VALID]))
+ if (!(cpu_flags & HMM_PFN_VALID))
return HMM_NEED_FAULT;
return 0;
}
static unsigned int
hmm_range_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
- const uint64_t *pfns, unsigned long npages,
- uint64_t cpu_flags)
+ const unsigned long hmm_pfns[], unsigned long npages,
+ unsigned long cpu_flags)
{
struct hmm_range *range = hmm_vma_walk->range;
unsigned int required_fault = 0;
@@ -142,12 +129,12 @@ hmm_range_need_fault(const struct hmm_vma_walk *hmm_vma_walk,
* hmm_pte_need_fault() will always return 0.
*/
if (!((range->default_flags | range->pfn_flags_mask) &
- range->flags[HMM_PFN_VALID]))
+ HMM_PFN_REQ_FAULT))
return 0;
for (i = 0; i < npages; ++i) {
- required_fault |=
- hmm_pte_need_fault(hmm_vma_walk, pfns[i], cpu_flags);
+ required_fault |= hmm_pte_need_fault(hmm_vma_walk, hmm_pfns[i],
+ cpu_flags);
if (required_fault == HMM_NEED_ALL_BITS)
return required_fault;
}
@@ -161,12 +148,13 @@ static int hmm_vma_walk_hole(unsigned long addr, unsigned long end,
struct hmm_range *range = hmm_vma_walk->range;
unsigned int required_fault;
unsigned long i, npages;
- uint64_t *pfns;
+ unsigned long *hmm_pfns;
i = (addr - range->start) >> PAGE_SHIFT;
npages = (end - addr) >> PAGE_SHIFT;
- pfns = &range->pfns[i];
- required_fault = hmm_range_need_fault(hmm_vma_walk, pfns, npages, 0);
+ hmm_pfns = &range->hmm_pfns[i];
+ required_fault =
+ hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0);
if (!walk->vma) {
if (required_fault)
return -EFAULT;
@@ -174,44 +162,44 @@ static int hmm_vma_walk_hole(unsigned long addr, unsigned long end,
}
if (required_fault)
return hmm_vma_fault(addr, end, required_fault, walk);
- return hmm_pfns_fill(addr, end, range, HMM_PFN_NONE);
+ return hmm_pfns_fill(addr, end, range, 0);
}
-static inline uint64_t pmd_to_hmm_pfn_flags(struct hmm_range *range, pmd_t pmd)
+static inline unsigned long pmd_to_hmm_pfn_flags(struct hmm_range *range,
+ pmd_t pmd)
{
if (pmd_protnone(pmd))
return 0;
- return pmd_write(pmd) ? range->flags[HMM_PFN_VALID] |
- range->flags[HMM_PFN_WRITE] :
- range->flags[HMM_PFN_VALID];
+ return pmd_write(pmd) ? (HMM_PFN_VALID | HMM_PFN_WRITE) : HMM_PFN_VALID;
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
- unsigned long end, uint64_t *pfns, pmd_t pmd)
+ unsigned long end, unsigned long hmm_pfns[],
+ pmd_t pmd)
{
struct hmm_vma_walk *hmm_vma_walk = walk->private;
struct hmm_range *range = hmm_vma_walk->range;
unsigned long pfn, npages, i;
unsigned int required_fault;
- uint64_t cpu_flags;
+ unsigned long cpu_flags;
npages = (end - addr) >> PAGE_SHIFT;
cpu_flags = pmd_to_hmm_pfn_flags(range, pmd);
required_fault =
- hmm_range_need_fault(hmm_vma_walk, pfns, npages, cpu_flags);
+ hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, cpu_flags);
if (required_fault)
return hmm_vma_fault(addr, end, required_fault, walk);
pfn = pmd_pfn(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
for (i = 0; addr < end; addr += PAGE_SIZE, i++, pfn++)
- pfns[i] = hmm_device_entry_from_pfn(range, pfn) | cpu_flags;
+ hmm_pfns[i] = pfn | cpu_flags;
return 0;
}
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
/* stub to allow the code below to compile */
int hmm_vma_handle_pmd(struct mm_walk *walk, unsigned long addr,
- unsigned long end, uint64_t *pfns, pmd_t pmd);
+ unsigned long end, unsigned long hmm_pfns[], pmd_t pmd);
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline bool hmm_is_device_private_entry(struct hmm_range *range,
@@ -222,31 +210,31 @@ static inline bool hmm_is_device_private_entry(struct hmm_range *range,
range->dev_private_owner;
}
-static inline uint64_t pte_to_hmm_pfn_flags(struct hmm_range *range, pte_t pte)
+static inline unsigned long pte_to_hmm_pfn_flags(struct hmm_range *range,
+ pte_t pte)
{
if (pte_none(pte) || !pte_present(pte) || pte_protnone(pte))
return 0;
- return pte_write(pte) ? range->flags[HMM_PFN_VALID] |
- range->flags[HMM_PFN_WRITE] :
- range->flags[HMM_PFN_VALID];
+ return pte_write(pte) ? (HMM_PFN_VALID | HMM_PFN_WRITE) : HMM_PFN_VALID;
}
static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
unsigned long end, pmd_t *pmdp, pte_t *ptep,
- uint64_t *pfn)
+ unsigned long *hmm_pfn)
{
struct hmm_vma_walk *hmm_vma_walk = walk->private;
struct hmm_range *range = hmm_vma_walk->range;
unsigned int required_fault;
- uint64_t cpu_flags;
+ unsigned long cpu_flags;
pte_t pte = *ptep;
- uint64_t orig_pfn = *pfn;
+ uint64_t pfn_req_flags = *hmm_pfn;
if (pte_none(pte)) {
- required_fault = hmm_pte_need_fault(hmm_vma_walk, orig_pfn, 0);
+ required_fault =
+ hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0);
if (required_fault)
goto fault;
- *pfn = range->values[HMM_PFN_NONE];
+ *hmm_pfn = 0;
return 0;
}
@@ -258,17 +246,18 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
* the PFN even if not present.
*/
if (hmm_is_device_private_entry(range, entry)) {
- *pfn = hmm_device_entry_from_pfn(range,
- device_private_entry_to_pfn(entry));
- *pfn |= range->flags[HMM_PFN_VALID];
+ cpu_flags = HMM_PFN_VALID;
if (is_write_device_private_entry(entry))
- *pfn |= range->flags[HMM_PFN_WRITE];
+ cpu_flags |= HMM_PFN_WRITE;
+ *hmm_pfn = device_private_entry_to_pfn(entry) |
+ cpu_flags;
return 0;
}
- required_fault = hmm_pte_need_fault(hmm_vma_walk, orig_pfn, 0);
+ required_fault =
+ hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0);
if (!required_fault) {
- *pfn = range->values[HMM_PFN_NONE];
+ *hmm_pfn = 0;
return 0;
}
@@ -288,7 +277,8 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
}
cpu_flags = pte_to_hmm_pfn_flags(range, pte);
- required_fault = hmm_pte_need_fault(hmm_vma_walk, orig_pfn, cpu_flags);
+ required_fault =
+ hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, cpu_flags);
if (required_fault)
goto fault;
@@ -297,15 +287,15 @@ static int hmm_vma_handle_pte(struct mm_walk *walk, unsigned long addr,
* fall through and treat it like a normal page.
*/
if (pte_special(pte) && !is_zero_pfn(pte_pfn(pte))) {
- if (hmm_pte_need_fault(hmm_vma_walk, orig_pfn, 0)) {
+ if (hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, 0)) {
pte_unmap(ptep);
return -EFAULT;
}
- *pfn = range->values[HMM_PFN_ERROR];
+ *hmm_pfn = HMM_PFN_ERROR;
return 0;
}
- *pfn = hmm_device_entry_from_pfn(range, pte_pfn(pte)) | cpu_flags;
+ *hmm_pfn = pte_pfn(pte) | cpu_flags;
return 0;
fault:
@@ -321,7 +311,8 @@ static int hmm_vma_walk_pmd(pmd_t *pmdp,
{
struct hmm_vma_walk *hmm_vma_walk = walk->private;
struct hmm_range *range = hmm_vma_walk->range;
- uint64_t *pfns = &range->pfns[(start - range->start) >> PAGE_SHIFT];
+ unsigned long *hmm_pfns =
+ &range->hmm_pfns[(start - range->start) >> PAGE_SHIFT];
unsigned long npages = (end - start) >> PAGE_SHIFT;
unsigned long addr = start;
pte_t *ptep;
@@ -333,16 +324,16 @@ again:
return hmm_vma_walk_hole(start, end, -1, walk);
if (thp_migration_supported() && is_pmd_migration_entry(pmd)) {
- if (hmm_range_need_fault(hmm_vma_walk, pfns, npages, 0)) {
+ if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0)) {
hmm_vma_walk->last = addr;
pmd_migration_entry_wait(walk->mm, pmdp);
return -EBUSY;
}
- return hmm_pfns_fill(start, end, range, HMM_PFN_NONE);
+ return hmm_pfns_fill(start, end, range, 0);
}
if (!pmd_present(pmd)) {
- if (hmm_range_need_fault(hmm_vma_walk, pfns, npages, 0))
+ if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0))
return -EFAULT;
return hmm_pfns_fill(start, end, range, HMM_PFN_ERROR);
}
@@ -362,7 +353,7 @@ again:
if (!pmd_devmap(pmd) && !pmd_trans_huge(pmd))
goto again;
- return hmm_vma_handle_pmd(walk, addr, end, pfns, pmd);
+ return hmm_vma_handle_pmd(walk, addr, end, hmm_pfns, pmd);
}
/*
@@ -372,16 +363,16 @@ again:
* recover.
*/
if (pmd_bad(pmd)) {
- if (hmm_range_need_fault(hmm_vma_walk, pfns, npages, 0))
+ if (hmm_range_need_fault(hmm_vma_walk, hmm_pfns, npages, 0))
return -EFAULT;
return hmm_pfns_fill(start, end, range, HMM_PFN_ERROR);
}
ptep = pte_offset_map(pmdp, addr);
- for (; addr < end; addr += PAGE_SIZE, ptep++, pfns++) {
+ for (; addr < end; addr += PAGE_SIZE, ptep++, hmm_pfns++) {
int r;
- r = hmm_vma_handle_pte(walk, addr, end, pmdp, ptep, pfns);
+ r = hmm_vma_handle_pte(walk, addr, end, pmdp, ptep, hmm_pfns);
if (r) {
/* hmm_vma_handle_pte() did pte_unmap() */
return r;
@@ -393,13 +384,12 @@ again:
#if defined(CONFIG_ARCH_HAS_PTE_DEVMAP) && \
defined(CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD)
-static inline uint64_t pud_to_hmm_pfn_flags(struct hmm_range *range, pud_t pud)
+static inline unsigned long pud_to_hmm_pfn_flags(struct hmm_range *range,
+ pud_t pud)
{
if (!pud_present(pud))
return 0;
- return pud_write(pud) ? range->flags[HMM_PFN_VALID] |
- range->flags[HMM_PFN_WRITE] :
- range->flags[HMM_PFN_VALID];
+ return pud_write(pud) ? (HMM_PFN_VALID | HMM_PFN_WRITE) : HMM_PFN_VALID;
}
static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
@@ -427,7 +417,8 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
if (pud_huge(pud) && pud_devmap(pud)) {
unsigned long i, npages, pfn;
unsigned int required_fault;
- uint64_t *pfns, cpu_flags;
+ unsigned long *hmm_pfns;
+ unsigned long cpu_flags;
if (!pud_present(pud)) {
spin_unlock(ptl);
@@ -436,10 +427,10 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
i = (addr - range->start) >> PAGE_SHIFT;
npages = (end - addr) >> PAGE_SHIFT;
- pfns = &range->pfns[i];
+ hmm_pfns = &range->hmm_pfns[i];
cpu_flags = pud_to_hmm_pfn_flags(range, pud);
- required_fault = hmm_range_need_fault(hmm_vma_walk, pfns,
+ required_fault = hmm_range_need_fault(hmm_vma_walk, hmm_pfns,
npages, cpu_flags);
if (required_fault) {
spin_unlock(ptl);
@@ -448,8 +439,7 @@ static int hmm_vma_walk_pud(pud_t *pudp, unsigned long start, unsigned long end,
pfn = pud_pfn(pud) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
for (i = 0; i < npages; ++i, ++pfn)
- pfns[i] = hmm_device_entry_from_pfn(range, pfn) |
- cpu_flags;
+ hmm_pfns[i] = pfn | cpu_flags;
goto out_unlock;
}
@@ -473,8 +463,9 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
struct hmm_vma_walk *hmm_vma_walk = walk->private;
struct hmm_range *range = hmm_vma_walk->range;
struct vm_area_struct *vma = walk->vma;
- uint64_t orig_pfn, cpu_flags;
unsigned int required_fault;
+ unsigned long pfn_req_flags;
+ unsigned long cpu_flags;
spinlock_t *ptl;
pte_t entry;
@@ -482,9 +473,10 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
entry = huge_ptep_get(pte);
i = (start - range->start) >> PAGE_SHIFT;
- orig_pfn = range->pfns[i];
+ pfn_req_flags = range->hmm_pfns[i];
cpu_flags = pte_to_hmm_pfn_flags(range, entry);
- required_fault = hmm_pte_need_fault(hmm_vma_walk, orig_pfn, cpu_flags);
+ required_fault =
+ hmm_pte_need_fault(hmm_vma_walk, pfn_req_flags, cpu_flags);
if (required_fault) {
spin_unlock(ptl);
return hmm_vma_fault(addr, end, required_fault, walk);
@@ -492,8 +484,8 @@ static int hmm_vma_walk_hugetlb_entry(pte_t *pte, unsigned long hmask,
pfn = pte_pfn(entry) + ((start & ~hmask) >> PAGE_SHIFT);
for (; addr < end; addr += PAGE_SIZE, i++, pfn++)
- range->pfns[i] = hmm_device_entry_from_pfn(range, pfn) |
- cpu_flags;
+ range->hmm_pfns[i] = pfn | cpu_flags;
+
spin_unlock(ptl);
return 0;
}
@@ -524,7 +516,7 @@ static int hmm_vma_walk_test(unsigned long start, unsigned long end,
* failure.
*/
if (hmm_range_need_fault(hmm_vma_walk,
- range->pfns +
+ range->hmm_pfns +
((start - range->start) >> PAGE_SHIFT),
(end - start) >> PAGE_SHIFT, 0))
return -EFAULT;
generated by cgit (git 2.34.1) at 2024-05-22 09:57:01 +0000