linux-kernel - [PATCH 3/8] accel/habanalabs: add a common handler for clock change events

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240527150224.1953969-3-obitton@habana.ai>
Date: Mon, 27 May 2024 18:02:19 +0300
From: Ofir Bitton <obitton@...ana.ai>
To: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc: Tomer Tayar <ttayar@...ana.ai>
Subject: [PATCH 3/8] accel/habanalabs: add a common handler for clock change events

From: Tomer Tayar <ttayar@...ana.ai>

As the new dynamic EQ includes clock change events which are common and
not ASIC-specific, add a common handler for these events.

Signed-off-by: Tomer Tayar <ttayar@...ana.ai>
Reviewed-by: Ofir Bitton <obitton@...ana.ai>
---
 drivers/accel/habanalabs/common/device.c     | 46 ++++++++++++++++++++
 drivers/accel/habanalabs/common/habanalabs.h |  1 +
 2 files changed, 47 insertions(+)

diff --git a/drivers/accel/habanalabs/common/device.c b/drivers/accel/habanalabs/common/device.c
index fd117489a05a..31daa9184537 100644
--- a/drivers/accel/habanalabs/common/device.c
+++ b/drivers/accel/habanalabs/common/device.c
@@ -2860,3 +2860,49 @@ void hl_eq_heartbeat_event_handle(struct hl_device *hdev)
 	hdev->heartbeat_debug_info.heartbeat_event_counter++;
 	hdev->eq_heartbeat_received = true;
 }
+
+void hl_handle_clk_change_event(struct hl_device *hdev, u16 event_type, u64 *event_mask)
+{
+	struct hl_clk_throttle *clk_throttle = &hdev->clk_throttling;
+	ktime_t zero_time = ktime_set(0, 0);
+
+	mutex_lock(&clk_throttle->lock);
+
+	switch (event_type) {
+	case EQ_EVENT_POWER_EVT_START:
+		clk_throttle->current_reason |= HL_CLK_THROTTLE_POWER;
+		clk_throttle->aggregated_reason |= HL_CLK_THROTTLE_POWER;
+		clk_throttle->timestamp[HL_CLK_THROTTLE_TYPE_POWER].start = ktime_get();
+		clk_throttle->timestamp[HL_CLK_THROTTLE_TYPE_POWER].end = zero_time;
+		dev_dbg_ratelimited(hdev->dev, "Clock throttling due to power consumption\n");
+		break;
+
+	case EQ_EVENT_POWER_EVT_END:
+		clk_throttle->current_reason &= ~HL_CLK_THROTTLE_POWER;
+		clk_throttle->timestamp[HL_CLK_THROTTLE_TYPE_POWER].end = ktime_get();
+		dev_dbg_ratelimited(hdev->dev, "Power envelop is safe, back to optimal clock\n");
+		break;
+
+	case EQ_EVENT_THERMAL_EVT_START:
+		clk_throttle->current_reason |= HL_CLK_THROTTLE_THERMAL;
+		clk_throttle->aggregated_reason |= HL_CLK_THROTTLE_THERMAL;
+		clk_throttle->timestamp[HL_CLK_THROTTLE_TYPE_THERMAL].start = ktime_get();
+		clk_throttle->timestamp[HL_CLK_THROTTLE_TYPE_THERMAL].end = zero_time;
+		*event_mask |= HL_NOTIFIER_EVENT_USER_ENGINE_ERR;
+		dev_info_ratelimited(hdev->dev, "Clock throttling due to overheating\n");
+		break;
+
+	case EQ_EVENT_THERMAL_EVT_END:
+		clk_throttle->current_reason &= ~HL_CLK_THROTTLE_THERMAL;
+		clk_throttle->timestamp[HL_CLK_THROTTLE_TYPE_THERMAL].end = ktime_get();
+		*event_mask |= HL_NOTIFIER_EVENT_USER_ENGINE_ERR;
+		dev_info_ratelimited(hdev->dev, "Thermal envelop is safe, back to optimal clock\n");
+		break;
+
+	default:
+		dev_err(hdev->dev, "Received invalid clock change event %d\n", event_type);
+		break;
+	}
+
+	mutex_unlock(&clk_throttle->lock);
+}
diff --git a/drivers/accel/habanalabs/common/habanalabs.h b/drivers/accel/habanalabs/common/habanalabs.h
index 0d16b5310add..3ea1b131cd42 100644
--- a/drivers/accel/habanalabs/common/habanalabs.h
+++ b/drivers/accel/habanalabs/common/habanalabs.h
@@ -4063,6 +4063,7 @@ void hl_enable_err_info_capture(struct hl_error_info *captured_err_info);
 void hl_init_cpu_for_irq(struct hl_device *hdev);
 void hl_set_irq_affinity(struct hl_device *hdev, int irq);
 void hl_eq_heartbeat_event_handle(struct hl_device *hdev);
+void hl_handle_clk_change_event(struct hl_device *hdev, u16 event_type, u64 *event_mask);
 
 #ifdef CONFIG_DEBUG_FS
 
-- 
2.34.1