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lib/scatterlist: add check when merging zone device pages 

Consecutive zone device pages should not be merged into the same sgl
or bvec segment with other types of pages or if they belong to different
pgmaps. Otherwise getting the pgmap of a given segment is not possible
without scanning the entire segment. This helper returns true either if
both pages are not zone device pages or both pages are zone device
pages with the same pgmap.

Factor out the check for page mergability into a pages_are_mergable()
helper and add a check with zone_device_pages_are_mergeable().

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20221021174116.7200-6-logang@deltatee.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Logan Gunthorpe 2022-10-21 11:41:12 -06:00 committed by Jens Axboe
parent 49580e6907
commit 1567b49d1a
1 changed files with 15 additions and 10 deletions
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25
lib/scatterlist.c
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@ -410,6 +410,15 @@ static struct scatterlist *get_next_sg(struct sg_append_table *table,
return new_sg;
}
static bool pages_are_mergeable(struct page *a, struct page *b)
{
if (page_to_pfn(a) != page_to_pfn(b) + 1)
return false;
if (!zone_device_pages_have_same_pgmap(a, b))
return false;
return true;
}
/**
* sg_alloc_append_table_from_pages - Allocate and initialize an append sg
* table from an array of pages
@ -447,6 +456,7 @@ int sg_alloc_append_table_from_pages(struct sg_append_table *sgt_append,
unsigned int chunks, cur_page, seg_len, i, prv_len = 0;
unsigned int added_nents = 0;
struct scatterlist *s = sgt_append->prv;
struct page *last_pg;
/*
* The algorithm below requires max_segment to be aligned to PAGE_SIZE
@ -460,21 +470,17 @@ int sg_alloc_append_table_from_pages(struct sg_append_table *sgt_append,
return -EOPNOTSUPP;
if (sgt_append->prv) {
unsigned long paddr =
(page_to_pfn(sg_page(sgt_append->prv)) * PAGE_SIZE +
sgt_append->prv->offset + sgt_append->prv->length) /
PAGE_SIZE;
if (WARN_ON(offset))
return -EINVAL;
/* Merge contiguous pages into the last SG */
prv_len = sgt_append->prv->length;
while (n_pages && page_to_pfn(pages[0]) == paddr) {
last_pg = sg_page(sgt_append->prv);
while (n_pages && pages_are_mergeable(last_pg, pages[0])) {
if (sgt_append->prv->length + PAGE_SIZE > max_segment)
break;
sgt_append->prv->length += PAGE_SIZE;
paddr++;
last_pg = pages[0];
pages++;
n_pages--;
}
@ -488,7 +494,7 @@ int sg_alloc_append_table_from_pages(struct sg_append_table *sgt_append,
for (i = 1; i < n_pages; i++) {
seg_len += PAGE_SIZE;
if (seg_len >= max_segment ||
page_to_pfn(pages[i]) != page_to_pfn(pages[i - 1]) + 1) {
!pages_are_mergeable(pages[i], pages[i - 1])) {
chunks++;
seg_len = 0;
}
@ -504,8 +510,7 @@ int sg_alloc_append_table_from_pages(struct sg_append_table *sgt_append,
for (j = cur_page + 1; j < n_pages; j++) {
seg_len += PAGE_SIZE;
if (seg_len >= max_segment ||
page_to_pfn(pages[j]) !=
page_to_pfn(pages[j - 1]) + 1)
!pages_are_mergeable(pages[j], pages[j - 1]))
break;
}