Add a trace event to follow devices attaching block drives:
$ qemu-system-arm -M n800 -trace blk_\*
9513@1594040428.738162:blk_attach_dev attaching blk 'sd0' to device
'omap2-mmc'
9513@1594040428.738189:blk_attach_dev attaching blk 'sd0' to device 'sd-card'
qemu-system-arm: sd_init failed: blk 'sd0' already attached by device
'sd-card'
Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
block/block-backend.c | 1 +
block/trace-events | 1 +
2 files changed, 2 insertions(+)
diff --git a/block/block-backend.c b/block/block-backend.c
index 6936b25c83..23caa45e6a 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -886,6 +886,7 @@ void blk_get_perm(BlockBackend *blk, uint64_t *perm,
uint64_t *shared_perm)
*/
int blk_attach_dev(BlockBackend *blk, DeviceState *dev)
{
+ trace_blk_attach_dev(blk_name(blk), object_get_typename(OBJECT(dev)));
if (blk->dev) {
return -EBUSY;
}
diff --git a/block/trace-events b/block/trace-events
index dbe76a7613..aa641c2034 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -9,6 +9,7 @@ blk_co_preadv(void *blk, void *bs, int64_t offset, unsigned int
bytes, int flags
blk_co_pwritev(void *blk, void *bs, int64_t offset, unsigned int bytes, int
flags) "blk %p bs %p offset %"PRId64" bytes %u flags 0x%x"
blk_root_attach(void *child, void *blk, void *bs) "child %p blk %p bs %p"
blk_root_detach(void *child, void *blk, void *bs) "child %p blk %p bs %p"
+blk_attach_dev(const char *blk_name, const char *dev_name) "attaching blk '%s'
to device '%s'"
# io.c
bdrv_co_preadv(void *bs, int64_t offset, int64_t nbytes, unsigned int flags)
"bs %p offset %"PRId64" nbytes %"PRId64" flags 0x%x"
--
2.21.3
