diff options
Diffstat (limited to 'lib/scatterlist.c')
-rw-r--r-- | lib/scatterlist.c | 42 |
1 files changed, 26 insertions, 16 deletions
diff --git a/lib/scatterlist.c b/lib/scatterlist.c index c8c3d675845c..8d7519a8f308 100644 --- a/lib/scatterlist.c +++ b/lib/scatterlist.c @@ -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 @@ -460,26 +470,27 @@ 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; + unsigned long next_pfn = (page_to_phys(sg_page(sgt_append->prv)) + + 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) { - if (sgt_append->prv->length + PAGE_SIZE > max_segment) - break; - sgt_append->prv->length += PAGE_SIZE; - paddr++; - pages++; - n_pages--; + if (page_to_pfn(pages[0]) == next_pfn) { + last_pg = pfn_to_page(next_pfn - 1); + while (n_pages && pages_are_mergeable(pages[0], last_pg)) { + if (sgt_append->prv->length + PAGE_SIZE > max_segment) + break; + sgt_append->prv->length += PAGE_SIZE; + last_pg = pages[0]; + pages++; + n_pages--; + } + if (!n_pages) + goto out; } - if (!n_pages) - goto out; } /* compute number of contiguous chunks */ @@ -488,7 +499,7 @@ 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 +515,7 @@ 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; } |