This patch converts .dma_alignment into stacked limit, so the stack
driver may get updated with underlying dma alignment, and allocate
IO buffer as queue DMA aligned.
Cc: Vitaly Kuznetsov <vkuzn...@redhat.com>
Cc: Dave Chinner <dchin...@redhat.com>
Cc: Linux FS Devel <linux-fsde...@vger.kernel.org>
Cc: Darrick J. Wong <darrick.w...@oracle.com>
Cc: x...@vger.kernel.org
Cc: Dave Chinner <dchin...@redhat.com>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Bart Van Assche <bvanass...@acm.org>
Cc: Matthew Wilcox <wi...@infradead.org>
Signed-off-by: Ming Lei <ming....@redhat.com>
---
block/blk-settings.c | 89 +++++++++++++++++++++++++++++-----------------------
1 file changed, 50 insertions(+), 39 deletions(-)
diff --git a/block/blk-settings.c b/block/blk-settings.c
index cf9cd241dc16..aef4510a99b6 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -525,6 +525,54 @@ void blk_queue_stack_limits(struct request_queue *t,
struct request_queue *b)
EXPORT_SYMBOL(blk_queue_stack_limits);
/**
+ * blk_queue_dma_alignment - set dma length and memory alignment
+ * @q: the request queue for the device
+ * @mask: alignment mask
+ *
+ * description:
+ * set required memory and length alignment for direct dma transactions.
+ * this is used when building direct io requests for the queue.
+ *
+ **/
+void blk_queue_dma_alignment(struct request_queue *q, int mask)
+{
+ q->limits.dma_alignment = mask;
+}
+EXPORT_SYMBOL(blk_queue_dma_alignment);
+
+static int __blk_queue_update_dma_alignment(struct queue_limits *t, int mask)
+{
+ BUG_ON(mask >= PAGE_SIZE);
+
+ if (mask > t->dma_alignment)
+ return mask;
+ else
+ return t->dma_alignment;
+}
+
+/**
+ * blk_queue_update_dma_alignment - update dma length and memory alignment
+ * @q: the request queue for the device
+ * @mask: alignment mask
+ *
+ * description:
+ * update required memory and length alignment for direct dma transactions.
+ * If the requested alignment is larger than the current alignment, then
+ * the current queue alignment is updated to the new value, otherwise it
+ * is left alone. The design of this is to allow multiple objects
+ * (driver, device, transport etc) to set their respective
+ * alignments without having them interfere.
+ *
+ **/
+void blk_queue_update_dma_alignment(struct request_queue *q, int mask)
+{
+ q->limits.dma_alignment =
+ __blk_queue_update_dma_alignment(&q->limits, mask);
+}
+EXPORT_SYMBOL(blk_queue_update_dma_alignment);
+
+
+/**
* blk_stack_limits - adjust queue_limits for stacked devices
* @t: the stacking driver limits (top device)
* @b: the underlying queue limits (bottom, component device)
@@ -563,6 +611,8 @@ int blk_stack_limits(struct queue_limits *t, struct
queue_limits *b,
b->seg_boundary_mask);
t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask,
b->virt_boundary_mask);
+ t->dma_alignment = __blk_queue_update_dma_alignment(t,
+ b->dma_alignment);
t->max_segments = min_not_zero(t->max_segments, b->max_segments);
t->max_discard_segments = min_not_zero(t->max_discard_segments,
@@ -818,45 +868,6 @@ void blk_queue_virt_boundary(struct request_queue *q,
unsigned long mask)
}
EXPORT_SYMBOL(blk_queue_virt_boundary);
-/**
- * blk_queue_dma_alignment - set dma length and memory alignment
- * @q: the request queue for the device
- * @mask: alignment mask
- *
- * description:
- * set required memory and length alignment for direct dma transactions.
- * this is used when building direct io requests for the queue.
- *
- **/
-void blk_queue_dma_alignment(struct request_queue *q, int mask)
-{
- q->limits.dma_alignment = mask;
-}
-EXPORT_SYMBOL(blk_queue_dma_alignment);
-
-/**
- * blk_queue_update_dma_alignment - update dma length and memory alignment
- * @q: the request queue for the device
- * @mask: alignment mask
- *
- * description:
- * update required memory and length alignment for direct dma transactions.
- * If the requested alignment is larger than the current alignment, then
- * the current queue alignment is updated to the new value, otherwise it
- * is left alone. The design of this is to allow multiple objects
- * (driver, device, transport etc) to set their respective
- * alignments without having them interfere.
- *
- **/
-void blk_queue_update_dma_alignment(struct request_queue *q, int mask)
-{
- BUG_ON(mask > PAGE_SIZE);
-
- if (mask > q->limits.dma_alignment)
- q->limits.dma_alignment = mask;
-}
-EXPORT_SYMBOL(blk_queue_update_dma_alignment);
-
void blk_queue_flush_queueable(struct request_queue *q, bool queueable)
{
if (queueable)
--
2.9.5
