[PATCH v4 1/3] venus: Add debugfs interface to set firmware log level

[Stanimir Varbanov <stanimir.varbanov@linaro.org>]

This will be useful when debugging specific issues related to
firmware HFI interface.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
---
 drivers/media/platform/qcom/venus/Makefile    |  2 +-
 drivers/media/platform/qcom/venus/core.c      |  3 +++
 drivers/media/platform/qcom/venus/core.h      |  3 +++
 drivers/media/platform/qcom/venus/dbgfs.c     | 21 +++++++++++++++++++
 drivers/media/platform/qcom/venus/dbgfs.h     | 12 +++++++++++
 drivers/media/platform/qcom/venus/hfi_venus.c |  7 ++++++-
 6 files changed, 46 insertions(+), 2 deletions(-)
 create mode 100644 drivers/media/platform/qcom/venus/dbgfs.c
 create mode 100644 drivers/media/platform/qcom/venus/dbgfs.h

diff --git a/drivers/media/platform/qcom/venus/Makefile b/drivers/media/platform/qcom/venus/Makefile
index 64af0bc1edae..dfc636865709 100644
--- a/drivers/media/platform/qcom/venus/Makefile
+++ b/drivers/media/platform/qcom/venus/Makefile
@@ -3,7 +3,7 @@
 
 venus-core-objs += core.o helpers.o firmware.o \
 		   hfi_venus.o hfi_msgs.o hfi_cmds.o hfi.o \
-		   hfi_parser.o pm_helpers.o
+		   hfi_parser.o pm_helpers.o dbgfs.o
 
 venus-dec-objs += vdec.o vdec_ctrls.o
 venus-enc-objs += venc.o venc_ctrls.o
diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
index 203c6538044f..249141e27fea 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -290,6 +290,8 @@ static int venus_probe(struct platform_device *pdev)
 	if (ret)
 		goto err_dev_unregister;
 
+	venus_dbgfs_init(core);
+
 	return 0;
 
 err_dev_unregister:
@@ -337,6 +339,7 @@ static int venus_remove(struct platform_device *pdev)
 	v4l2_device_unregister(&core->v4l2_dev);
 	mutex_destroy(&core->pm_lock);
 	mutex_destroy(&core->lock);
+	venus_dbgfs_deinit(core);
 
 	return ret;
 }
diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index 7118612673c9..b48782f9aa95 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -12,6 +12,7 @@
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
 
+#include "dbgfs.h"
 #include "hfi.h"
 
 #define VIDC_CLKS_NUM_MAX		4
@@ -136,6 +137,7 @@ struct venus_caps {
  * @priv:	a private filed for HFI operations
  * @ops:		the core HFI operations
  * @work:	a delayed work for handling system fatal error
+ * @root:	debugfs root directory
  */
 struct venus_core {
 	void __iomem *base;
@@ -185,6 +187,7 @@ struct venus_core {
 	unsigned int codecs_count;
 	unsigned int core0_usage_count;
 	unsigned int core1_usage_count;
+	struct dentry *root;
 };
 
 struct vdec_controls {
diff --git a/drivers/media/platform/qcom/venus/dbgfs.c b/drivers/media/platform/qcom/venus/dbgfs.c
new file mode 100644
index 000000000000..782d54ac1b8f
--- /dev/null
+++ b/drivers/media/platform/qcom/venus/dbgfs.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2020 Linaro Ltd.
+ */
+
+#include <linux/debugfs.h>
+
+#include "core.h"
+
+extern int venus_fw_debug;
+
+void venus_dbgfs_init(struct venus_core *core)
+{
+	core->root = debugfs_create_dir("venus", NULL);
+	debugfs_create_x32("fw_level", 0644, core->root, &venus_fw_debug);
+}
+
+void venus_dbgfs_deinit(struct venus_core *core)
+{
+	debugfs_remove_recursive(core->root);
+}
diff --git a/drivers/media/platform/qcom/venus/dbgfs.h b/drivers/media/platform/qcom/venus/dbgfs.h
new file mode 100644
index 000000000000..b7b621a8472f
--- /dev/null
+++ b/drivers/media/platform/qcom/venus/dbgfs.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (C) 2020 Linaro Ltd. */
+
+#ifndef __VENUS_DBGFS_H__
+#define __VENUS_DBGFS_H__
+
+struct venus_core;
+
+void venus_dbgfs_init(struct venus_core *core);
+void venus_dbgfs_deinit(struct venus_core *core);
+
+#endif
diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
index 0d8855014ab3..3a04b08ab85a 100644
--- a/drivers/media/platform/qcom/venus/hfi_venus.c
+++ b/drivers/media/platform/qcom/venus/hfi_venus.c
@@ -130,7 +130,7 @@ struct venus_hfi_device {
 };
 
 static bool venus_pkt_debug;
-static int venus_fw_debug = HFI_DEBUG_MSG_ERROR | HFI_DEBUG_MSG_FATAL;
+int venus_fw_debug = HFI_DEBUG_MSG_ERROR | HFI_DEBUG_MSG_FATAL;
 static bool venus_sys_idle_indicator;
 static bool venus_fw_low_power_mode = true;
 static int venus_hw_rsp_timeout = 1000;
@@ -1130,9 +1130,14 @@ static int venus_session_init(struct venus_inst *inst, u32 session_type,
 			      u32 codec)
 {
 	struct venus_hfi_device *hdev = to_hfi_priv(inst->core);
+	struct device *dev = hdev->core->dev;
 	struct hfi_session_init_pkt pkt;
 	int ret;
 
+	ret = venus_sys_set_debug(hdev, venus_fw_debug);
+	if (ret)
+		dev_warn(dev, "setting fw debug msg ON failed (%d)\n", ret);
+
 	ret = pkt_session_init(&pkt, inst, session_type, codec);
 	if (ret)
 		goto err;
-- 
2.17.1