[PATCH 2/2] block/nvme: Trace NVMe spec version supported by the controller

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

NVMe controllers implement different versions of the spec,
and different features of it. It is useful to gather this
information when debugging.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 block/nvme.c       | 6 ++++++
 block/trace-events | 1 +
 2 files changed, 7 insertions(+)

diff --git a/block/nvme.c b/block/nvme.c
index 80c4318d8fc..2b5421e7aa6 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -708,6 +708,7 @@ static int nvme_init(BlockDriverState *bs, const char *device, int namespace,
     AioContext *aio_context = bdrv_get_aio_context(bs);
     int ret;
     uint64_t cap;
+    uint32_t ver;
     uint64_t timeout_ms;
     uint64_t deadline, now;
     volatile NvmeBar *regs = NULL;
@@ -764,6 +765,11 @@ static int nvme_init(BlockDriverState *bs, const char *device, int namespace,
     bs->bl.request_alignment = s->page_size;
     timeout_ms = MIN(500 * NVME_CAP_TO(cap), 30000);
 
+    ver = le32_to_cpu(regs->vs);
+    trace_nvme_controller_spec_version(extract32(ver, 16, 16),
+                                       extract32(ver, 8, 8),
+                                       extract32(ver, 0, 8));
+
     /* Reset device to get a clean state. */
     regs->cc = cpu_to_le32(le32_to_cpu(regs->cc) & 0xFE);
     /* Wait for CSTS.RDY = 0. */
diff --git a/block/trace-events b/block/trace-events
index 8368f4acb0b..ecbc32a80a9 100644
--- a/block/trace-events
+++ b/block/trace-events
@@ -136,6 +136,7 @@ qed_aio_write_main(void *s, void *acb, int ret, uint64_t offset, size_t len) "s
 # nvme.c
 nvme_controller_capability_raw(uint64_t value) "0x%08"PRIx64
 nvme_controller_capability(const char *desc, uint64_t value) "%s: %"PRIu64
+nvme_controller_spec_version(uint32_t mjr, uint32_t mnr, uint32_t ter) "Specification supported: %u.%u.%u"
 nvme_kick(void *s, unsigned q_index) "s %p q #%u"
 nvme_dma_flush_queue_wait(void *s) "s %p"
 nvme_error(int cmd_specific, int sq_head, int sqid, int cid, int status) "cmd_specific %d sq_head %d sqid %d cid %d status 0x%x"
-- 
2.26.2