Keep statistics of some hardware errors, and number of
aligned/unaligned I/O accesses.
QMP example booting a full RHEL 8.3 aarch64 guest:
{ "execute": "query-blockstats" }
{
"return": [
{
"device": "",
"node-name": "drive0",
"stats": {
"flush_total_time_ns": 6026948,
"wr_highest_offset": 3383991230464,
"wr_total_time_ns": 807450995,
"failed_wr_operations": 0,
"failed_rd_operations": 0,
"wr_merged": 3,
"wr_bytes": 50133504,
"failed_unmap_operations": 0,
"failed_flush_operations": 0,
"account_invalid": false,
"rd_total_time_ns": 1846979900,
"flush_operations": 130,
"wr_operations": 659,
"rd_merged": 1192,
"rd_bytes": 218244096,
"account_failed": false,
"idle_time_ns": 2678641497,
"rd_operations": 7406,
},
"driver-specific": {
"driver": "nvme",
"completion-errors": 0,
"unaligned-access-nb": 2959,
"aligned-access-nb": 4477
},
"qdev": "/machine/peripheral-anon/device[0]/virtio-backend"
}
]
}
Suggested-by: Stefan Hajnoczi
Signed-off-by: Philippe Mathieu-Daudé
---
qapi/block-core.json | 24 +++-
block/nvme.c | 27 +++
2 files changed, 50 insertions(+), 1 deletion(-)
diff --git a/qapi/block-core.json b/qapi/block-core.json
index 86ed72ef9f..795e4185bd 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -941,6 +941,27 @@
'discard-nb-failed': 'uint64',
'discard-bytes-ok': 'uint64' } }
+##
+# @BlockStatsSpecificNvme:
+#
+# NVMe driver statistics
+#
+# @completion-errors: The number of completion errors.
+#
+# @aligned-access-nb: The number of aligned accesses performed by
+# the driver.
+#
+# @unaligned-access-nb: The number of unaligned accesses performed by
+# the driver.
+#
+# Since: 5.2
+##
+{ 'struct': 'BlockStatsSpecificNvme',
+ 'data': {
+ 'completion-errors': 'uint64',
+ 'aligned-access-nb': 'uint64',
+ 'unaligned-access-nb': 'uint64' } }
+
##
# @BlockStatsSpecific:
#
@@ -953,7 +974,8 @@
'discriminator': 'driver',
'data': {
'file': 'BlockStatsSpecificFile',
- 'host_device': 'BlockStatsSpecificFile' } }
+ 'host_device': 'BlockStatsSpecificFile',
+ 'nvme': 'BlockStatsSpecificNvme' } }
##
# @BlockStats:
diff --git a/block/nvme.c b/block/nvme.c
index f4f27b6da7..382f696202 100644
--- a/block/nvme.c
+++ b/block/nvme.c
@@ -133,6 +133,12 @@ struct BDRVNVMeState {
/* PCI address (required for nvme_refresh_filename()) */
char *device;
+
+struct {
+uint64_t completion_errors;
+uint64_t aligned_access_nb;
+uint64_t unaligned_access_nb;
+} stats;
};
#define NVME_BLOCK_OPT_DEVICE "device"
@@ -389,6 +395,9 @@ static bool nvme_process_completion(NVMeQueuePair *q)
break;
}
ret = nvme_translate_error(c);
+if (ret) {
+s->stats.completion_errors++;
+}
q->cq.head = (q->cq.head + 1) % NVME_QUEUE_SIZE;
if (!q->cq.head) {
q->cq_phase = !q->cq_phase;
@@ -1146,8 +1155,10 @@ static int nvme_co_prw(BlockDriverState *bs, uint64_t
offset, uint64_t bytes,
assert(QEMU_IS_ALIGNED(bytes, s->page_size));
assert(bytes <= s->max_transfer);
if (nvme_qiov_aligned(bs, qiov)) {
+s->stats.aligned_access_nb++;
return nvme_co_prw_aligned(bs, offset, bytes, qiov, is_write, flags);
}
+s->stats.unaligned_access_nb++;
trace_nvme_prw_buffered(s, offset, bytes, qiov->niov, is_write);
buf = qemu_try_memalign(s->page_size, bytes);
@@ -1443,6 +1454,21 @@ static void nvme_unregister_buf(BlockDriverState *bs,
void *host)
qemu_vfio_dma_unmap(s->vfio, host);
}
+static BlockStatsSpecific *nvme_get_specific_stats(BlockDriverState *bs)
+{
+BlockStatsSpecific *stats = g_new(BlockStatsSpecific, 1);
+BDRVNVMeState *s = bs->opaque;
+
+stats->driver = BLOCKDEV_DRIVER_NVME;
+stats->u.nvme = (BlockStatsSpecificNvme) {
+.completion_errors = s->stats.completion_errors,
+.aligned_access_nb = s->stats.aligned_access_nb,
+.unaligned_access_nb = s->stats.unaligned_access_nb,
+};
+
+return stats;
+}
+
static const char *const nvme_strong_runtime_opts[] = {
NVME_BLOCK_OPT_DEVICE,
NVME_BLOCK_OPT_NAMESPACE,
@@ -1476,6 +1502,7 @@ static BlockDriver bdrv_nvme = {
.bdrv_refresh_filename= nvme_refresh_filename,
.bdrv_refresh_limits = nvme_refresh_limits,
.strong_runtime_opts = nvme_strong_runtime_opts,
+.bdrv_get_specific_stats = nvme_get_specific_stats,
