On 5/18/22 19:11, Keith Busch wrote:
From: Keith Busch <kbusch@xxxxxxxxxx>
User space may want to know how to align their buffers to avoid
bouncing. Export the queue attribute.
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
---
block/blk-sysfs.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 88bd41d4cb59..14607565d781 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -274,6 +274,11 @@ static ssize_t queue_virt_boundary_mask_show(struct request_queue *q, char *page
return queue_var_show(q->limits.virt_boundary_mask, page);
}
+static ssize_t queue_dma_alignment_show(struct request_queue *q, char *page)
+{
+ return queue_var_show(queue_dma_alignment(q), page);
+}
+
#define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
static ssize_t \
queue_##name##_show(struct request_queue *q, char *page) \
@@ -606,6 +611,7 @@ QUEUE_RO_ENTRY(queue_dax, "dax");
QUEUE_RW_ENTRY(queue_io_timeout, "io_timeout");
QUEUE_RW_ENTRY(queue_wb_lat, "wbt_lat_usec");
QUEUE_RO_ENTRY(queue_virt_boundary_mask, "virt_boundary_mask");
+QUEUE_RO_ENTRY(queue_dma_alignment, "dma_alignment");
#ifdef CONFIG_BLK_DEV_THROTTLING_LOW
QUEUE_RW_ENTRY(blk_throtl_sample_time, "throttle_sample_time");
@@ -667,6 +673,7 @@ static struct attribute *queue_attrs[] = {
&blk_throtl_sample_time_entry.attr,
#endif
&queue_virt_boundary_mask_entry.attr,
+ &queue_dma_alignment_entry.attr,
NULL,
};
Please add an entry for the new sysfs attribute in
Documentation/ABI/stable/sysfs-block.
Thanks,
Bart.
