linux-kernel - [PATCH 2/2] habanalabs: enable device before hw

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Message-Id: <20200716073129.5924-2-oded.gabbay@gmail.com>
Date:   Thu, 16 Jul 2020 10:31:29 +0300
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     linux-kernel@...r.kernel.org, SW_Drivers@...ana.ai
Subject: [PATCH 2/2] habanalabs: enable device before hw_init()

Device is now enabled before the hw_init() because part of the
initialization requires communication with the device firmware to get
information that is required for the initialization itself

Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
---
 drivers/misc/habanalabs/common/device.c | 16 ++++++++++++----
 drivers/misc/habanalabs/common/sysfs.c  |  3 +++
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index 84800efec10d..9919ff121067 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -1033,6 +1033,12 @@ int hl_device_reset(struct hl_device *hdev, bool hard_reset,
 		}
 	}
 
+	/* Device is now enabled as part of the initialization requires
+	 * communication with the device firmware to get information that
+	 * is required for the initialization itself
+	 */
+	hdev->disabled = false;
+
 	rc = hdev->asic_funcs->hw_init(hdev);
 	if (rc) {
 		dev_err(hdev->dev,
@@ -1040,8 +1046,6 @@ int hl_device_reset(struct hl_device *hdev, bool hard_reset,
 		goto out_err;
 	}
 
-	hdev->disabled = false;
-
 	/* Check that the communication with the device is working */
 	rc = hdev->asic_funcs->test_queues(hdev);
 	if (rc) {
@@ -1261,6 +1265,12 @@ int hl_device_init(struct hl_device *hdev, struct class *hclass)
 	 */
 	add_cdev_sysfs_on_err = true;
 
+	/* Device is now enabled as part of the initialization requires
+	 * communication with the device firmware to get information that
+	 * is required for the initialization itself
+	 */
+	hdev->disabled = false;
+
 	rc = hdev->asic_funcs->hw_init(hdev);
 	if (rc) {
 		dev_err(hdev->dev, "failed to initialize the H/W\n");
@@ -1268,8 +1278,6 @@ int hl_device_init(struct hl_device *hdev, struct class *hclass)
 		goto out_disabled;
 	}
 
-	hdev->disabled = false;
-
 	/* Check that the communication with the device is working */
 	rc = hdev->asic_funcs->test_queues(hdev);
 	if (rc) {
diff --git a/drivers/misc/habanalabs/common/sysfs.c b/drivers/misc/habanalabs/common/sysfs.c
index 5d78d5e1c782..c4e7c682d584 100644
--- a/drivers/misc/habanalabs/common/sysfs.c
+++ b/drivers/misc/habanalabs/common/sysfs.c
@@ -334,6 +334,9 @@ static ssize_t eeprom_read_handler(struct file *filp, struct kobject *kobj,
 	char *data;
 	int rc;
 
+	if (hl_device_disabled_or_in_reset(hdev))
+		return -ENODEV;
+
 	if (!max_size)
 		return -EINVAL;
 
-- 
2.17.1