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mm/hmm: move hmm_vma_range_done and hmm_vma_fault to nouveau

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These two functions are marked as a legacy APIs to get rid of, but seem to
suit the current nouveau flow.  Move it to the only user in preparation
for fixing a locking bug involving caller and callee.  All comments
referring to the old API have been removed as this now is a driver private
helper.

Link: https://lore.kernel.org/r/20190724065258.16603-3-hch@lst.de
Tested-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Christoph Hellwig
2019-07-24 08:52:53 +02:00
committed by Jason Gunthorpe
parent 2bcbeaefde
commit 02712bc325
2 changed files with 44 additions and 56 deletions
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54
include/linux/hmm.h
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@@ -484,60 +484,6 @@ long hmm_range_dma_unmap(struct hmm_range *range,
*/
#define HMM_RANGE_DEFAULT_TIMEOUT 1000
/* This is a temporary helper to avoid merge conflict between trees. */
static inline bool hmm_vma_range_done(struct hmm_range *range)
{
bool ret = hmm_range_valid(range);
hmm_range_unregister(range);
return ret;
}
/* This is a temporary helper to avoid merge conflict between trees. */
static inline int hmm_vma_fault(struct hmm_mirror *mirror,
struct hmm_range *range, bool block)
{
long ret;
/*
* With the old API the driver must set each individual entries with
* the requested flags (valid, write, ...). So here we set the mask to
* keep intact the entries provided by the driver and zero out the
* default_flags.
*/
range->default_flags = 0;
range->pfn_flags_mask = -1UL;
ret = hmm_range_register(range, mirror,
range->start, range->end,
PAGE_SHIFT);
if (ret)
return (int)ret;
if (!hmm_range_wait_until_valid(range, HMM_RANGE_DEFAULT_TIMEOUT)) {
/*
* The mmap_sem was taken by driver we release it here and
* returns -EAGAIN which correspond to mmap_sem have been
* drop in the old API.
*/
up_read(&range->vma->vm_mm->mmap_sem);
return -EAGAIN;
}
ret = hmm_range_fault(range, block);
if (ret <= 0) {
if (ret == -EBUSY || !ret) {
/* Same as above, drop mmap_sem to match old API. */
up_read(&range->vma->vm_mm->mmap_sem);
ret = -EBUSY;
} else if (ret == -EAGAIN)
ret = -EBUSY;
hmm_range_unregister(range);
return ret;
}
return 0;
}
/* Below are for HMM internal use only! Not to be used by device driver! */
static inline void hmm_mm_init(struct mm_struct *mm)
{