[PATCH] nvme: add bug report info for global duplicate id

[Keith Busch <kbusch@fb.com>]

From: Keith Busch <kbusch@kernel.org>

The recent global id check is finding poorly implemented devices in the
wild. Include relavant device information in the output to help quicken
an appropriate quirk patch.

Signed-off-by: Keith Busch <kbusch@kernel.org>
---
 drivers/nvme/host/core.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 24165daee3c8..4cda5024a352 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3852,6 +3852,13 @@ static int nvme_global_check_duplicate_ids(struct nvme_subsystem *this,
 	return ret;
 }
 
+static int nvme_str_len(char *s, int len)
+{
+	while (s[len - 1] == ' ')
+		len--;
+	return len;
+}
+
 static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
 		struct nvme_ns_ids *ids, bool is_shared)
 {
@@ -3861,8 +3868,18 @@ static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid,
 
 	ret = nvme_global_check_duplicate_ids(ctrl->subsys, ids);
 	if (ret) {
+		struct nvme_subsystem *subsys = ctrl->subsys;
+
 		dev_err(ctrl->device,
 			"globally duplicate IDs for nsid %d\n", nsid);
+		dev_err(ctrl->device,
+			"bug report info: VID:%04x model:%.*s firmware:%.*s\n",
+			subsys->vendor_id,
+			nvme_str_len(subsys->model, sizeof(subsys->model)),
+			subsys->model,
+			nvme_str_len(subsys->firmware_rev,
+				     sizeof(subsys->firmware_rev)),
+			subsys->firmware_rev);
 		return ret;
 	}
 
-- 
2.30.2