habanalabs: enable stop-on-error debugfs setting per ASIC

On Goya and Gaudi, the stop-on-error configuration can be set via
debugfs. However, in future devices, this configuration will always be
enabled.
Modify the debugfs node to be allowed only for ASICs that support this
dynamic configuration.
Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

Documentation/ABI/testing/debugfs-driver-habanalabs

@@ -222,6 +222,7 @@ KernelVersion:  5.6
 Contact:        ogabbay@kernel.org
 Description:    Sets the stop-on_error option for the device engines. Value of
                 "0" is for disable, otherwise enable.
+                Relevant only for GOYA and GAUDI.
 
 What:           /sys/kernel/debug/habanalabs/hl<n>/timeout_locked
 Date:           Sep 2021

drivers/misc/habanalabs/common/debugfs.c

@@ -1071,6 +1071,9 @@ static ssize_t hl_stop_on_err_read(struct file *f, char __user *buf,
 	char tmp_buf[200];
 	ssize_t rc;
 
+	if (!hdev->asic_prop.configurable_stop_on_err)
+		return -EOPNOTSUPP;
+
 	if (*ppos)
 		return 0;
 
@@ -1089,6 +1092,9 @@ static ssize_t hl_stop_on_err_write(struct file *f, const char __user *buf,
 	u32 value;
 	ssize_t rc;
 
+	if (!hdev->asic_prop.configurable_stop_on_err)
+		return -EOPNOTSUPP;
+
 	if (hdev->reset_info.in_reset) {
 		dev_warn_ratelimited(hdev->dev,
 				"Can't change stop on error during reset\n");

drivers/misc/habanalabs/common/habanalabs.h

@@ -561,6 +561,7 @@ struct hl_hints_range {
  *                              use-case of doing soft-reset in training (due
  *                              to the fact that training runs on multiple
  *                              devices)
+ * @configurable_stop_on_err: is stop-on-error option configurable via debugfs.
  */
 struct asic_fixed_properties {
 	struct hw_queue_properties	*hw_queues_props;
@@ -644,6 +645,7 @@ struct asic_fixed_properties {
 	u8				use_get_power_for_reset_history;
 	u8				supports_soft_reset;
 	u8				allow_inference_soft_reset;
+	u8				configurable_stop_on_err;
 };
 
 /**

drivers/misc/habanalabs/gaudi/gaudi.c

@@ -669,6 +669,8 @@ static int gaudi_set_fixed_properties(struct hl_device *hdev)
 
 	prop->use_get_power_for_reset_history = true;
 
+	prop->configurable_stop_on_err = true;
+
 	return 0;
 }
 

drivers/misc/habanalabs/goya/goya.c

@@ -483,6 +483,8 @@ int goya_set_fixed_properties(struct hl_device *hdev)
 
 	prop->use_get_power_for_reset_history = true;
 
+	prop->configurable_stop_on_err = true;
+
 	return 0;
 }