linux-kernel - [PATCH 5/7] habanalabs: allow control device open during reset

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Date:   Mon, 29 Aug 2022 12:22:52 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ofir Bitton <obitton@...ana.ai>
Subject: [PATCH 5/7] habanalabs: allow control device open during reset

From: Ofir Bitton <obitton@...ana.ai>

Monitoring apps would like to query device state at any time so we
should allow it also during reset because it doesn't involve
accessing the h/w.

Signed-off-by: Ofir Bitton <obitton@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/device.c       | 22 +++++++++++++++++++
 drivers/misc/habanalabs/common/habanalabs.h   |  2 ++
 .../misc/habanalabs/common/habanalabs_drv.c   |  4 ++--
 3 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index 230b7eeef962..ea6238e614f1 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -352,6 +352,28 @@ bool hl_device_operational(struct hl_device *hdev,
 	}
 }
 
+bool hl_ctrl_device_operational(struct hl_device *hdev,
+		enum hl_device_status *status)
+{
+	enum hl_device_status current_status;
+
+	current_status = hl_device_status(hdev);
+	if (status)
+		*status = current_status;
+
+	switch (current_status) {
+	case HL_DEVICE_STATUS_MALFUNCTION:
+		return false;
+	case HL_DEVICE_STATUS_IN_RESET:
+	case HL_DEVICE_STATUS_IN_RESET_AFTER_DEVICE_RELEASE:
+	case HL_DEVICE_STATUS_NEEDS_RESET:
+	case HL_DEVICE_STATUS_OPERATIONAL:
+	case HL_DEVICE_STATUS_IN_DEVICE_CREATION:
+	default:
+		return true;
+	}
+}
+
 static void hpriv_release(struct kref *ref)
 {
 	u64 idle_mask[HL_BUSY_ENGINES_MASK_EXT_SIZE] = {0};
diff --git a/drivers/misc/habanalabs/common/habanalabs.h b/drivers/misc/habanalabs/common/habanalabs.h
index 33c6476b60a9..cf9cbbd09063 100644
--- a/drivers/misc/habanalabs/common/habanalabs.h
+++ b/drivers/misc/habanalabs/common/habanalabs.h
@@ -3486,6 +3486,8 @@ int hl_device_open(struct inode *inode, struct file *filp);
 int hl_device_open_ctrl(struct inode *inode, struct file *filp);
 bool hl_device_operational(struct hl_device *hdev,
 		enum hl_device_status *status);
+bool hl_ctrl_device_operational(struct hl_device *hdev,
+		enum hl_device_status *status);
 enum hl_device_status hl_device_status(struct hl_device *hdev);
 int hl_device_set_debug_mode(struct hl_device *hdev, struct hl_ctx *ctx, bool enable);
 int hl_hw_queues_create(struct hl_device *hdev);
diff --git a/drivers/misc/habanalabs/common/habanalabs_drv.c b/drivers/misc/habanalabs/common/habanalabs_drv.c
index e12148428731..7bf0dc245d39 100644
--- a/drivers/misc/habanalabs/common/habanalabs_drv.c
+++ b/drivers/misc/habanalabs/common/habanalabs_drv.c
@@ -268,9 +268,9 @@ int hl_device_open_ctrl(struct inode *inode, struct file *filp)
 
 	mutex_lock(&hdev->fpriv_ctrl_list_lock);
 
-	if (!hl_device_operational(hdev, NULL)) {
+	if (!hl_ctrl_device_operational(hdev, NULL)) {
 		dev_err_ratelimited(hdev->dev_ctrl,
-			"Can't open %s because it is disabled or in reset\n",
+			"Can't open %s because it is disabled\n",
 			dev_name(hdev->dev_ctrl));
 		rc = -EPERM;
 		goto out_err;
-- 
2.25.1