linux-kernel - [PATCH 5/7] habanalabs: trace LBW reads/writes

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Message-Id: <20230108172040.3991204-5-ogabbay@kernel.org>
Date:   Sun,  8 Jan 2023 19:20:38 +0200
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ohad Sharabi <osharabi@...ana.ai>
Subject: [PATCH 5/7] habanalabs: trace LBW reads/writes

From: Ohad Sharabi <osharabi@...ana.ai>

Add traces to LBW reads/writes.
This may be handy when debugging configuration failure or events when
tracking configuration flow.

Signed-off-by: Ohad Sharabi <osharabi@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/accel/habanalabs/common/device.c  | 10 +++++++++-
 drivers/accel/habanalabs/common/pci/pci.c | 10 +++++++++-
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/accel/habanalabs/common/device.c b/drivers/accel/habanalabs/common/device.c
index 6a05ab3fda23..722a5beb0974 100644
--- a/drivers/accel/habanalabs/common/device.c
+++ b/drivers/accel/habanalabs/common/device.c
@@ -2401,7 +2401,12 @@ void hl_device_fini(struct hl_device *hdev)
  */
 inline u32 hl_rreg(struct hl_device *hdev, u32 reg)
 {
-	return readl(hdev->rmmio + reg);
+	u32 val = readl(hdev->rmmio + reg);
+
+	if (unlikely(trace_habanalabs_rreg32_enabled()))
+		trace_habanalabs_rreg32(hdev->dev, reg, val);
+
+	return val;
 }
 
 /*
@@ -2416,6 +2421,9 @@ inline u32 hl_rreg(struct hl_device *hdev, u32 reg)
  */
 inline void hl_wreg(struct hl_device *hdev, u32 reg, u32 val)
 {
+	if (unlikely(trace_habanalabs_wreg32_enabled()))
+		trace_habanalabs_wreg32(hdev->dev, reg, val);
+
 	writel(val, hdev->rmmio + reg);
 }
 
diff --git a/drivers/accel/habanalabs/common/pci/pci.c b/drivers/accel/habanalabs/common/pci/pci.c
index 5fe3da5fba30..d1f4c695baf2 100644
--- a/drivers/accel/habanalabs/common/pci/pci.c
+++ b/drivers/accel/habanalabs/common/pci/pci.c
@@ -10,6 +10,8 @@
 
 #include <linux/pci.h>
 
+#include <trace/events/habanalabs.h>
+
 #define HL_PLDM_PCI_ELBI_TIMEOUT_MSEC	(HL_PCI_ELBI_TIMEOUT_MSEC * 100)
 
 #define IATU_REGION_CTRL_REGION_EN_MASK		BIT(31)
@@ -120,6 +122,9 @@ int hl_pci_elbi_read(struct hl_device *hdev, u64 addr, u32 *data)
 	if ((val & PCI_CONFIG_ELBI_STS_MASK) == PCI_CONFIG_ELBI_STS_DONE) {
 		pci_read_config_dword(pdev, mmPCI_CONFIG_ELBI_DATA, data);
 
+		if (unlikely(trace_habanalabs_elbi_read_enabled()))
+			trace_habanalabs_elbi_read(hdev->dev, (u32) addr, val);
+
 		return 0;
 	}
 
@@ -179,8 +184,11 @@ static int hl_pci_elbi_write(struct hl_device *hdev, u64 addr, u32 data)
 		usleep_range(300, 500);
 	}
 
-	if ((val & PCI_CONFIG_ELBI_STS_MASK) == PCI_CONFIG_ELBI_STS_DONE)
+	if ((val & PCI_CONFIG_ELBI_STS_MASK) == PCI_CONFIG_ELBI_STS_DONE) {
+		if (unlikely(trace_habanalabs_elbi_write_enabled()))
+			trace_habanalabs_elbi_write(hdev->dev, (u32) addr, val);
 		return 0;
+	}
 
 	if (val & PCI_CONFIG_ELBI_STS_ERR)
 		return -EIO;
-- 
2.25.1