Merge branch 'for-6.11/block' into for-next

* for-6.11/block:
  block: pass a phys_addr_t to get_max_segment_size
  block: add a bvec_phys helper

Author: axboe

arch/m68k/emu/nfblock.c

@@ -71,7 +71,7 @@ static void nfhd_submit_bio(struct bio *bio)
 		len = bvec.bv_len;
 		len >>= 9;
 		nfhd_read_write(dev->id, 0, dir, sec >> shift, len >> shift,
-				page_to_phys(bvec.bv_page) + bvec.bv_offset);
+				bvec_phys(&bvec));
 		sec += len;
 	}
 	bio_endio(bio);

block/bio.c

@@ -953,7 +953,7 @@ bool bvec_try_merge_hw_page(struct request_queue *q, struct bio_vec *bv,
 		bool *same_page)
 {
 	unsigned long mask = queue_segment_boundary(q);
-	phys_addr_t addr1 = page_to_phys(bv->bv_page) + bv->bv_offset;
+	phys_addr_t addr1 = bvec_phys(bv);
 	phys_addr_t addr2 = page_to_phys(page) + offset + len - 1;
 
 	if ((addr1 | mask) != (addr2 | mask))

block/blk-merge.c

@@ -209,23 +209,22 @@ static inline unsigned get_max_io_size(struct bio *bio,
 /**
  * get_max_segment_size() - maximum number of bytes to add as a single segment
  * @lim: Request queue limits.
- * @start_page: See below.
- * @offset: Offset from @start_page where to add a segment.
+ * @paddr: address of the range to add
+ * @max_len: maximum length available to add at @paddr
  *
- * Returns the maximum number of bytes that can be added as a single segment.
+ * Returns the maximum number of bytes of the range starting at @paddr that can
+ * be added to a single segment.
  */
 static inline unsigned get_max_segment_size(const struct queue_limits *lim,
-		struct page *start_page, unsigned long offset)
+		phys_addr_t paddr, unsigned int len)
 {
-	unsigned long mask = lim->seg_boundary_mask;
-
-	offset = mask & (page_to_phys(start_page) + offset);
-
 	/*
 	 * Prevent an overflow if mask = ULONG_MAX and offset = 0 by adding 1
 	 * after having calculated the minimum.
 	 */
-	return min(mask - offset, (unsigned long)lim->max_segment_size - 1) + 1;
+	return min_t(unsigned long, len,
+		min(lim->seg_boundary_mask - (lim->seg_boundary_mask & paddr),
+		    (unsigned long)lim->max_segment_size - 1) + 1);
 }
 
 /**
@@ -258,9 +257,7 @@ static bool bvec_split_segs(const struct queue_limits *lim,
 	unsigned seg_size = 0;
 
 	while (len && *nsegs < max_segs) {
-		seg_size = get_max_segment_size(lim, bv->bv_page,
-						bv->bv_offset + total_len);
-		seg_size = min(seg_size, len);
+		seg_size = get_max_segment_size(lim, bvec_phys(bv) + total_len, len);
 
 		(*nsegs)++;
 		total_len += seg_size;
@@ -494,8 +491,8 @@ static unsigned blk_bvec_map_sg(struct request_queue *q,
 
 	while (nbytes > 0) {
 		unsigned offset = bvec->bv_offset + total;
-		unsigned len = min(get_max_segment_size(&q->limits,
-				   bvec->bv_page, offset), nbytes);
+		unsigned len = get_max_segment_size(&q->limits, bvec_phys(bvec),
+			nbytes);
 		struct page *page = bvec->bv_page;
 
 		/*

block/blk.h

@@ -99,8 +99,8 @@ static inline bool biovec_phys_mergeable(struct request_queue *q,
 		struct bio_vec *vec1, struct bio_vec *vec2)
 {
 	unsigned long mask = queue_segment_boundary(q);
-	phys_addr_t addr1 = page_to_phys(vec1->bv_page) + vec1->bv_offset;
-	phys_addr_t addr2 = page_to_phys(vec2->bv_page) + vec2->bv_offset;
+	phys_addr_t addr1 = bvec_phys(vec1);
+	phys_addr_t addr2 = bvec_phys(vec2);
 
 	/*
 	 * Merging adjacent physical pages may not work correctly under KMSAN

include/linux/bvec.h

@@ -280,4 +280,18 @@ static inline void *bvec_virt(struct bio_vec *bvec)
 	return page_address(bvec->bv_page) + bvec->bv_offset;
 }
 
+/**
+ * bvec_phys - return the physical address for a bvec
+ * @bvec: bvec to return the physical address for
+ */
+static inline phys_addr_t bvec_phys(const struct bio_vec *bvec)
+{
+	/*
+	 * Note this open codes page_to_phys because page_to_phys is defined in
+	 * <asm/io.h>, which we don't want to pull in here.  If it ever moves to
+	 * a sensible place we should start using it.
+	 */
+	return PFN_PHYS(page_to_pfn(bvec->bv_page)) + bvec->bv_offset;
+}
+
 #endif /* __LINUX_BVEC_H */