linux-kernel - [PATCH] habanalabs: expose reset counters via existing INFO IOCTL

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Date:   Sat, 16 Nov 2019 12:38:29 +0200
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     linux-kernel@...r.kernel.org, oshpigelman@...ana.ai,
        ttayar@...ana.ai
Cc:     gregkh@...uxfoundation.org, Moti Haimovski <mhaimovski@...ana.ai>
Subject: [PATCH] habanalabs: expose reset counters via existing INFO IOCTL

From: Moti Haimovski <mhaimovski@...ana.ai>

Expose both soft and hard reset counts via INFO IOCTL.
This will allow system management applications to easily check
if the device has undergone reset.

Signed-off-by: Moti Haimovski <mhaimovski@...ana.ai>
Reviewed-by: Oded Gabbay <oded.gabbay@...il.com>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
---
 drivers/misc/habanalabs/habanalabs_ioctl.c | 19 +++++++++++++++++++
 include/uapi/misc/habanalabs.h             |  9 +++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/misc/habanalabs/habanalabs_ioctl.c b/drivers/misc/habanalabs/habanalabs_ioctl.c
index 5d9c269d99db..6474b868ef27 100644
--- a/drivers/misc/habanalabs/habanalabs_ioctl.c
+++ b/drivers/misc/habanalabs/habanalabs_ioctl.c
@@ -242,6 +242,22 @@ static int get_clk_rate(struct hl_device *hdev, struct hl_info_args *args)
 		min((size_t) max_size, sizeof(clk_rate))) ? -EFAULT : 0;
 }
 
+static int get_reset_count(struct hl_device *hdev, struct hl_info_args *args)
+{
+	struct hl_info_reset_count reset_count = {0};
+	u32 max_size = args->return_size;
+	void __user *out = (void __user *) (uintptr_t) args->return_pointer;
+
+	if ((!max_size) || (!out))
+		return -EINVAL;
+
+	reset_count.hard_reset_cnt = hdev->hard_reset_cnt;
+	reset_count.soft_reset_cnt = hdev->soft_reset_cnt;
+
+	return copy_to_user(out, &reset_count,
+		min((size_t) max_size, sizeof(reset_count))) ? -EFAULT : 0;
+}
+
 static int _hl_info_ioctl(struct hl_fpriv *hpriv, void *data,
 				struct device *dev)
 {
@@ -260,6 +276,9 @@ static int _hl_info_ioctl(struct hl_fpriv *hpriv, void *data,
 	case HL_INFO_DEVICE_STATUS:
 		return device_status_info(hdev, args);
 
+	case HL_INFO_RESET_COUNT:
+		return get_reset_count(hdev, args);
+
 	default:
 		break;
 	}
diff --git a/include/uapi/misc/habanalabs.h b/include/uapi/misc/habanalabs.h
index 716e70750f23..4faa2c9767e5 100644
--- a/include/uapi/misc/habanalabs.h
+++ b/include/uapi/misc/habanalabs.h
@@ -98,6 +98,9 @@ enum hl_device_status {
  * HL_INFO_CLK_RATE            - Retrieve the current and maximum clock rate
  *                               of the device in MHz. The maximum clock rate is
  *                               configurable via sysfs parameter
+ * HL_INFO_RESET_COUNT   - Retrieve the counts of the soft and hard reset
+ *                         operations performed on the device since the last
+ *                         time the driver was loaded.
  */
 #define HL_INFO_HW_IP_INFO		0
 #define HL_INFO_HW_EVENTS		1
@@ -107,6 +110,7 @@ enum hl_device_status {
 #define HL_INFO_DEVICE_UTILIZATION	6
 #define HL_INFO_HW_EVENTS_AGGREGATE	7
 #define HL_INFO_CLK_RATE		8
+#define HL_INFO_RESET_COUNT		9
 
 #define HL_INFO_VERSION_MAX_LEN	128
 #define HL_INFO_CARD_NAME_MAX_LEN	16
@@ -160,6 +164,11 @@ struct hl_info_clk_rate {
 	__u32 max_clk_rate_mhz;
 };
 
+struct hl_info_reset_count {
+	__u32 hard_reset_cnt;
+	__u32 soft_reset_cnt;
+};
+
 struct hl_info_args {
 	/* Location of relevant struct in userspace */
 	__u64 return_pointer;
-- 
2.17.1