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authorImre Deak <imre.deak@intel.com>2013-02-27 17:02:56 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-27 19:10:10 -0800
commita321e91b6d73ed011ffceed384c40d2785cf723b (patch)
tree525598b796028211e615676f5e3182c630f992f1
parent5d96bf4d928c883635774d0aba1773f275de055c (diff)
lib/scatterlist: add simple page iterator
Add an iterator to walk through a scatter list a page at a time starting at a specific page offset. As opposed to the mapping iterator this is meant to be small, performing well even in simple loops like collecting all pages on the scatterlist into an array or setting up an iommu table based on the pages' DMA address. Signed-off-by: Imre Deak <imre.deak@intel.com> Cc: Maxim Levitsky <maximlevitsky@gmail.com> Cc: Tejun Heo <tj@kernel.org> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Tested-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/scatterlist.h35
-rw-r--r--lib/scatterlist.c38
2 files changed, 73 insertions, 0 deletions
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 4bd6c06eb28e..788a853aa7a7 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -231,6 +231,41 @@ size_t sg_copy_to_buffer(struct scatterlist *sgl, unsigned int nents,
*/
#define SG_MAX_SINGLE_ALLOC (PAGE_SIZE / sizeof(struct scatterlist))
+/*
+ * sg page iterator
+ *
+ * Iterates over sg entries page-by-page. On each successful iteration,
+ * @piter->page points to the current page, @piter->sg to the sg holding this
+ * page and @piter->sg_pgoffset to the page's page offset within the sg. The
+ * iteration will stop either when a maximum number of sg entries was reached
+ * or a terminating sg (sg_last(sg) == true) was reached.
+ */
+struct sg_page_iter {
+ struct page *page; /* current page */
+ struct scatterlist *sg; /* sg holding the page */
+ unsigned int sg_pgoffset; /* page offset within the sg */
+
+ /* these are internal states, keep away */
+ unsigned int __nents; /* remaining sg entries */
+ int __pg_advance; /* nr pages to advance at the
+ * next step */
+};
+
+bool __sg_page_iter_next(struct sg_page_iter *piter);
+void __sg_page_iter_start(struct sg_page_iter *piter,
+ struct scatterlist *sglist, unsigned int nents,
+ unsigned long pgoffset);
+
+/**
+ * for_each_sg_page - iterate over the pages of the given sg list
+ * @sglist: sglist to iterate over
+ * @piter: page iterator to hold current page, sg, sg_pgoffset
+ * @nents: maximum number of sg entries to iterate over
+ * @pgoffset: starting page offset
+ */
+#define for_each_sg_page(sglist, piter, nents, pgoffset) \
+ for (__sg_page_iter_start((piter), (sglist), (nents), (pgoffset)); \
+ __sg_page_iter_next(piter);)
/*
* Mapping sg iterator
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 7874b01e816e..a1d15647d7db 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -394,6 +394,44 @@ int sg_alloc_table_from_pages(struct sg_table *sgt,
}
EXPORT_SYMBOL(sg_alloc_table_from_pages);
+void __sg_page_iter_start(struct sg_page_iter *piter,
+ struct scatterlist *sglist, unsigned int nents,
+ unsigned long pgoffset)
+{
+ piter->__pg_advance = 0;
+ piter->__nents = nents;
+
+ piter->page = NULL;
+ piter->sg = sglist;
+ piter->sg_pgoffset = pgoffset;
+}
+EXPORT_SYMBOL(__sg_page_iter_start);
+
+static int sg_page_count(struct scatterlist *sg)
+{
+ return PAGE_ALIGN(sg->offset + sg->length) >> PAGE_SHIFT;
+}
+
+bool __sg_page_iter_next(struct sg_page_iter *piter)
+{
+ if (!piter->__nents || !piter->sg)
+ return false;
+
+ piter->sg_pgoffset += piter->__pg_advance;
+ piter->__pg_advance = 1;
+
+ while (piter->sg_pgoffset >= sg_page_count(piter->sg)) {
+ piter->sg_pgoffset -= sg_page_count(piter->sg);
+ piter->sg = sg_next(piter->sg);
+ if (!--piter->__nents || !piter->sg)
+ return false;
+ }
+ piter->page = nth_page(sg_page(piter->sg), piter->sg_pgoffset);
+
+ return true;
+}
+EXPORT_SYMBOL(__sg_page_iter_next);
+
/**
* sg_miter_start - start mapping iteration over a sg list
* @miter: sg mapping iter to be started