habanalabs: add support for a long interrupt target value

In order to avoid user target value wraparound, we modify the
current interface so user will be able to wait for an 8-byte
target value rather than a 4-byte value.
Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/misc/habanalabs/common/command_submission.c

@@ -2739,13 +2739,13 @@ static int hl_cs_wait_ioctl(struct hl_fpriv *hpriv, void *data)
 
 static int _hl_interrupt_wait_ioctl(struct hl_device *hdev, struct hl_ctx *ctx,
 				u32 timeout_us, u64 user_address,
-				u32 target_value, u16 interrupt_offset,
+				u64 target_value, u16 interrupt_offset,
 				enum hl_cs_wait_status *status)
 {
 	struct hl_user_pending_interrupt *pend;
 	struct hl_user_interrupt *interrupt;
 	unsigned long timeout, flags;
-	u32 completion_value;
+	u64 completion_value;
 	long completion_rc;
 	int rc = 0;
 
@@ -2779,7 +2779,7 @@ static int _hl_interrupt_wait_ioctl(struct hl_device *hdev, struct hl_ctx *ctx,
 	/* We check for completion value as interrupt could have been received
 	 * before we added the node to the wait list
 	 */
-	if (copy_from_user(&completion_value, u64_to_user_ptr(user_address), 4)) {
+	if (copy_from_user(&completion_value, u64_to_user_ptr(user_address), 8)) {
 		dev_err(hdev->dev, "Failed to copy completion value from user\n");
 		rc = -EFAULT;
 		goto remove_pending_user_interrupt;
@@ -2811,7 +2811,7 @@ static int _hl_interrupt_wait_ioctl(struct hl_device *hdev, struct hl_ctx *ctx,
 		reinit_completion(&pend->fence.completion);
 		spin_unlock_irqrestore(&interrupt->wait_list_lock, flags);
 
-		if (copy_from_user(&completion_value, u64_to_user_ptr(user_address), 4)) {
+		if (copy_from_user(&completion_value, u64_to_user_ptr(user_address), 8)) {
 			dev_err(hdev->dev, "Failed to copy completion value from user\n");
 			rc = -EFAULT;
 

include/uapi/misc/habanalabs.h

@@ -897,11 +897,7 @@ struct hl_wait_cs_in {
 			 */
 			__u64 addr;
 			/* Target value for completion comparison */
-			__u32 target;
-			/* Absolute timeout to wait for interrupt
-			 * in microseconds
-			 */
-			__u32 interrupt_timeout_us;
+			__u64 target;
 		};
 	};
 
@@ -917,7 +913,12 @@ struct hl_wait_cs_in {
 
 	/* Multi CS API info- valid entries in multi-CS array */
 	__u8 seq_arr_len;
-	__u8 pad[7];
+	__u8 pad[3];
+
+	/* Absolute timeout to wait for an interrupt in microseconds.
+	 * Relevant only when HL_WAIT_CS_FLAGS_INTERRUPT is set
+	 */
+	__u32 interrupt_timeout_us;
 };
 
 #define HL_WAIT_CS_STATUS_COMPLETED	0