habanalabs: define soft-reset as inference op

Soft-reset is the procedure where we reset only the compute/DMA engines
of the device, without requiring the current user-space process to
release the device.

This type of reset can happen if TDR event occurred (a workload got
stuck) or by a root request through sysfs.

This is only relevant for inference ASICs, as there is no real-world
use-case to do that in training, because training runs on multiple
devices.

In addition, we also do (in certain ASICs) a reset upon device release.
That reset uses the same code as the soft-reset.

Therefore, to better differentiate between the two resets, it is better
to rename the soft-reset support as "inference soft-reset", to make
the code more self-explanatory.
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/misc/habanalabs/common/device.c

@@ -954,7 +954,7 @@ int hl_device_reset(struct hl_device *hdev, u32 flags)
 		goto do_reset;
 	}
 
-	if (!hard_reset && !hdev->allow_external_soft_reset) {
+	if (!hard_reset && !hdev->allow_inference_soft_reset) {
 		hard_instead_soft = true;
 		hard_reset = true;
 	}

drivers/misc/habanalabs/common/habanalabs.h

@@ -2440,8 +2440,12 @@ struct multi_cs_data {
  * @collective_mon_idx: helper index for collective initialization
  * @supports_coresight: is CoreSight supported.
  * @supports_soft_reset: is soft reset supported.
- * @allow_external_soft_reset: true if soft reset initiated by user or TDR is
- *                             allowed.
+ * @allow_inference_soft_reset: true if the ASIC supports soft reset that is
+ *                              initiated by user or TDR. This is only true
+ *                              in inference ASICs, as there is no real-world
+ *                              use-case of doing soft-reset in training (due
+ *                              to the fact that training runs on multiple
+ *                              devices)
  * @supports_cb_mapping: is mapping a CB to the device's MMU supported.
  * @needs_reset: true if reset_on_lockup is false and device should be reset
  *               due to lockup.
@@ -2572,7 +2576,7 @@ struct hl_device {
 	u8				collective_mon_idx;
 	u8				supports_coresight;
 	u8				supports_soft_reset;
-	u8				allow_external_soft_reset;
+	u8				allow_inference_soft_reset;
 	u8				supports_cb_mapping;
 	u8				needs_reset;
 	u8				process_kill_trial_cnt;

drivers/misc/habanalabs/common/sysfs.c

@@ -206,12 +206,12 @@ static ssize_t soft_reset_store(struct device *dev,
 		goto out;
 	}
 
-	if (!hdev->allow_external_soft_reset) {
-		dev_err(hdev->dev, "Device does not support soft-reset\n");
+	if (!hdev->allow_inference_soft_reset) {
+		dev_err(hdev->dev, "Device does not support inference soft-reset\n");
 		goto out;
 	}
 
-	dev_warn(hdev->dev, "Soft-Reset requested through sysfs\n");
+	dev_warn(hdev->dev, "Inference Soft-Reset requested through sysfs\n");
 
 	hl_device_reset(hdev, 0);
 

drivers/misc/habanalabs/goya/goya.c

@@ -959,7 +959,7 @@ static int goya_sw_init(struct hl_device *hdev)
 	spin_lock_init(&goya->hw_queues_lock);
 	hdev->supports_coresight = true;
 	hdev->supports_soft_reset = true;
-	hdev->allow_external_soft_reset = true;
+	hdev->allow_inference_soft_reset = true;
 	hdev->supports_wait_for_multi_cs = false;
 
 	hdev->asic_funcs->set_pci_memory_regions(hdev);