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-rw-r--r--mm/hmm.c78
1 files changed, 28 insertions, 50 deletions
diff --git a/mm/hmm.c b/mm/hmm.c
index 812a66997627..fc5057d7aa05 100644
--- a/mm/hmm.c
+++ b/mm/hmm.c
@@ -533,11 +533,7 @@ fault:
/*
* hmm_vma_get_pfns() - snapshot CPU page table for a range of virtual addresses
- * @vma: virtual memory area containing the virtual address range
- * @range: used to track snapshot validity
- * @start: range virtual start address (inclusive)
- * @end: range virtual end address (exclusive)
- * @entries: array of hmm_pfn_t: provided by the caller, filled in by function
+ * @range: range being snapshotted
* Returns: -EINVAL if invalid argument, -ENOMEM out of memory, 0 success
*
* This snapshots the CPU page table for a range of virtual addresses. Snapshot
@@ -551,26 +547,23 @@ fault:
* NOT CALLING hmm_vma_range_done() IF FUNCTION RETURNS 0 WILL LEAD TO SERIOUS
* MEMORY CORRUPTION ! YOU HAVE BEEN WARNED !
*/
-int hmm_vma_get_pfns(struct vm_area_struct *vma,
- struct hmm_range *range,
- unsigned long start,
- unsigned long end,
- hmm_pfn_t *pfns)
+int hmm_vma_get_pfns(struct hmm_range *range)
{
+ struct vm_area_struct *vma = range->vma;
struct hmm_vma_walk hmm_vma_walk;
struct mm_walk mm_walk;
struct hmm *hmm;
/* FIXME support hugetlb fs */
if (is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_SPECIAL)) {
- hmm_pfns_special(pfns, start, end);
+ hmm_pfns_special(range->pfns, range->start, range->end);
return -EINVAL;
}
/* Sanity check, this really should not happen ! */
- if (start < vma->vm_start || start >= vma->vm_end)
+ if (range->start < vma->vm_start || range->start >= vma->vm_end)
return -EINVAL;
- if (end < vma->vm_start || end > vma->vm_end)
+ if (range->end < vma->vm_start || range->end > vma->vm_end)
return -EINVAL;
hmm = hmm_register(vma->vm_mm);
@@ -581,9 +574,6 @@ int hmm_vma_get_pfns(struct vm_area_struct *vma,
return -EINVAL;
/* Initialize range to track CPU page table update */
- range->start = start;
- range->pfns = pfns;
- range->end = end;
spin_lock(&hmm->lock);
range->valid = true;
list_add_rcu(&range->list, &hmm->ranges);
@@ -601,14 +591,13 @@ int hmm_vma_get_pfns(struct vm_area_struct *vma,
mm_walk.pmd_entry = hmm_vma_walk_pmd;
mm_walk.pte_hole = hmm_vma_walk_hole;
- walk_page_range(start, end, &mm_walk);
+ walk_page_range(range->start, range->end, &mm_walk);
return 0;
}
EXPORT_SYMBOL(hmm_vma_get_pfns);
/*
* hmm_vma_range_done() - stop tracking change to CPU page table over a range
- * @vma: virtual memory area containing the virtual address range
* @range: range being tracked
* Returns: false if range data has been invalidated, true otherwise
*
@@ -628,10 +617,10 @@ EXPORT_SYMBOL(hmm_vma_get_pfns);
*
* There are two ways to use this :
* again:
- * hmm_vma_get_pfns(vma, range, start, end, pfns); or hmm_vma_fault(...);
+ * hmm_vma_get_pfns(range); or hmm_vma_fault(...);
* trans = device_build_page_table_update_transaction(pfns);
* device_page_table_lock();
- * if (!hmm_vma_range_done(vma, range)) {
+ * if (!hmm_vma_range_done(range)) {
* device_page_table_unlock();
* goto again;
* }
@@ -639,13 +628,13 @@ EXPORT_SYMBOL(hmm_vma_get_pfns);
* device_page_table_unlock();
*
* Or:
- * hmm_vma_get_pfns(vma, range, start, end, pfns); or hmm_vma_fault(...);
+ * hmm_vma_get_pfns(range); or hmm_vma_fault(...);
* device_page_table_lock();
- * hmm_vma_range_done(vma, range);
- * device_update_page_table(pfns);
+ * hmm_vma_range_done(range);
+ * device_update_page_table(range->pfns);
* device_page_table_unlock();
*/
-bool hmm_vma_range_done(struct vm_area_struct *vma, struct hmm_range *range)
+bool hmm_vma_range_done(struct hmm_range *range)
{
unsigned long npages = (range->end - range->start) >> PAGE_SHIFT;
struct hmm *hmm;
@@ -655,7 +644,7 @@ bool hmm_vma_range_done(struct vm_area_struct *vma, struct hmm_range *range)
return false;
}
- hmm = hmm_register(vma->vm_mm);
+ hmm = hmm_register(range->vma->vm_mm);
if (!hmm) {
memset(range->pfns, 0, sizeof(*range->pfns) * npages);
return false;
@@ -671,11 +660,7 @@ EXPORT_SYMBOL(hmm_vma_range_done);
/*
* hmm_vma_fault() - try to fault some address in a virtual address range
- * @vma: virtual memory area containing the virtual address range
- * @range: use to track pfns array content validity
- * @start: fault range virtual start address (inclusive)
- * @end: fault range virtual end address (exclusive)
- * @pfns: array of hmm_pfn_t, only entry with fault flag set will be faulted
+ * @range: range being faulted
* @write: is it a write fault
* @block: allow blocking on fault (if true it sleeps and do not drop mmap_sem)
* Returns: 0 success, error otherwise (-EAGAIN means mmap_sem have been drop)
@@ -691,10 +676,10 @@ EXPORT_SYMBOL(hmm_vma_range_done);
* down_read(&mm->mmap_sem);
* // Find vma and address device wants to fault, initialize hmm_pfn_t
* // array accordingly
- * ret = hmm_vma_fault(vma, start, end, pfns, allow_retry);
+ * ret = hmm_vma_fault(range, write, block);
* switch (ret) {
* case -EAGAIN:
- * hmm_vma_range_done(vma, range);
+ * hmm_vma_range_done(range);
* // You might want to rate limit or yield to play nicely, you may
* // also commit any valid pfn in the array assuming that you are
* // getting true from hmm_vma_range_monitor_end()
@@ -708,7 +693,7 @@ EXPORT_SYMBOL(hmm_vma_range_done);
* }
* // Take device driver lock that serialize device page table update
* driver_lock_device_page_table_update();
- * hmm_vma_range_done(vma, range);
+ * hmm_vma_range_done(range);
* // Commit pfns we got from hmm_vma_fault()
* driver_unlock_device_page_table_update();
* up_read(&mm->mmap_sem)
@@ -718,28 +703,24 @@ EXPORT_SYMBOL(hmm_vma_range_done);
*
* YOU HAVE BEEN WARNED !
*/
-int hmm_vma_fault(struct vm_area_struct *vma,
- struct hmm_range *range,
- unsigned long start,
- unsigned long end,
- hmm_pfn_t *pfns,
- bool write,
- bool block)
+int hmm_vma_fault(struct hmm_range *range, bool write, bool block)
{
+ struct vm_area_struct *vma = range->vma;
+ unsigned long start = range->start;
struct hmm_vma_walk hmm_vma_walk;
struct mm_walk mm_walk;
struct hmm *hmm;
int ret;
/* Sanity check, this really should not happen ! */
- if (start < vma->vm_start || start >= vma->vm_end)
+ if (range->start < vma->vm_start || range->start >= vma->vm_end)
return -EINVAL;
- if (end < vma->vm_start || end > vma->vm_end)
+ if (range->end < vma->vm_start || range->end > vma->vm_end)
return -EINVAL;
hmm = hmm_register(vma->vm_mm);
if (!hmm) {
- hmm_pfns_clear(pfns, start, end);
+ hmm_pfns_clear(range->pfns, range->start, range->end);
return -ENOMEM;
}
/* Caller must have registered a mirror using hmm_mirror_register() */
@@ -747,9 +728,6 @@ int hmm_vma_fault(struct vm_area_struct *vma,
return -EINVAL;
/* Initialize range to track CPU page table update */
- range->start = start;
- range->pfns = pfns;
- range->end = end;
spin_lock(&hmm->lock);
range->valid = true;
list_add_rcu(&range->list, &hmm->ranges);
@@ -757,7 +735,7 @@ int hmm_vma_fault(struct vm_area_struct *vma,
/* FIXME support hugetlb fs */
if (is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_SPECIAL)) {
- hmm_pfns_special(pfns, start, end);
+ hmm_pfns_special(range->pfns, range->start, range->end);
return 0;
}
@@ -777,7 +755,7 @@ int hmm_vma_fault(struct vm_area_struct *vma,
mm_walk.pte_hole = hmm_vma_walk_hole;
do {
- ret = walk_page_range(start, end, &mm_walk);
+ ret = walk_page_range(start, range->end, &mm_walk);
start = hmm_vma_walk.last;
} while (ret == -EAGAIN);
@@ -785,8 +763,8 @@ int hmm_vma_fault(struct vm_area_struct *vma,
unsigned long i;
i = (hmm_vma_walk.last - range->start) >> PAGE_SHIFT;
- hmm_pfns_clear(&pfns[i], hmm_vma_walk.last, end);
- hmm_vma_range_done(vma, range);
+ hmm_pfns_clear(&range->pfns[i], hmm_vma_walk.last, range->end);
+ hmm_vma_range_done(range);
}
return ret;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 16:10:42 +0000