habanalabs: print context refcount value if hard reset fails

Failing to kill a user process during a hard reset can be due to a
reference to the user context which isn't released.
To make it easier to understand if this the reason for the failure and
not something else, add a print of the context refcount value.

Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index f5864893237cc27f3d5eec528d66546aa9961660..926f230def56bcbeb53a842750dfc8a89ef82cdc 100644 (file)
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -696,10 +696,22 @@ static void device_hard_reset_pending(struct work_struct *work)
        flags = device_reset_work->flags | HL_DRV_RESET_FROM_RESET_THR;
 
        rc = hl_device_reset(hdev, flags);
+
        if ((rc == -EBUSY) && !hdev->device_fini_pending) {
-               dev_info(hdev->dev,
-                       "Could not reset device. will try again in %u seconds",
-                       HL_PENDING_RESET_PER_SEC);
+               struct hl_ctx *ctx = hl_get_compute_ctx(hdev);
+
+               if (ctx) {
+                       /* The read refcount value should subtracted by one, because the read is
+                        * protected with hl_get_compute_ctx().
+                        */
+                       dev_info(hdev->dev,
+                               "Could not reset device (compute_ctx refcount %u). will try again in %u seconds",
+                               kref_read(&ctx->refcount) - 1, HL_PENDING_RESET_PER_SEC);
+                       hl_ctx_put(ctx);
+               } else {
+                       dev_info(hdev->dev, "Could not reset device. will try again in %u seconds",
+                               HL_PENDING_RESET_PER_SEC);
+               }
 
                queue_delayed_work(hdev->reset_wq, &device_reset_work->reset_work,
                                        msecs_to_jiffies(HL_PENDING_RESET_PER_SEC * 1000));