habanalabs: verify queue can contain all cs jobs

In order for the user to be aware of wrong inputs, we must return
error in case the amount of jobs per cs exceeds the corresponding
queue size.

Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

diff --git a/drivers/misc/habanalabs/habanalabs.h b/drivers/misc/habanalabs/habanalabs.h
index 01fb458..14def0d 100644 (file)
--- a/drivers/misc/habanalabs/habanalabs.h
+++ b/drivers/misc/habanalabs/habanalabs.h
@@ -421,6 +421,10 @@ struct hl_cs_job;
 #define HL_QUEUE_LENGTH                        4096
 #define HL_QUEUE_SIZE_IN_BYTES         (HL_QUEUE_LENGTH * HL_BD_SIZE)
 
+#if (HL_MAX_JOBS_PER_CS > HL_QUEUE_LENGTH)
+#error "HL_QUEUE_LENGTH must be greater than HL_MAX_JOBS_PER_CS"
+#endif
+
 /* HL_CQ_LENGTH is in units of struct hl_cq_entry */
 #define HL_CQ_LENGTH                   HL_QUEUE_LENGTH
 #define HL_CQ_SIZE_IN_BYTES            (HL_CQ_LENGTH * HL_CQ_ENTRY_SIZE)

diff --git a/drivers/misc/habanalabs/hw_queue.c b/drivers/misc/habanalabs/hw_queue.c
index 474a0e8..2876816 100644 (file)
--- a/drivers/misc/habanalabs/hw_queue.c
+++ b/drivers/misc/habanalabs/hw_queue.c
@@ -158,6 +158,13 @@ static int int_queue_sanity_checks(struct hl_device *hdev,
 {
        int free_slots_cnt;
 
+       if (num_of_entries > q->int_queue_len) {
+               dev_err(hdev->dev,
+                       "Cannot populate queue %u with %u jobs\n",
+                       q->hw_queue_id, num_of_entries);
+               return -ENOMEM;
+       }
+
        /* Check we have enough space in the queue */
        free_slots_cnt = queue_free_slots(q, q->int_queue_len);