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Date: Mon, 1 Mar 2021 17:09:26 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Guido Günther <agx@...xcpu.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v3 1/4] usb: typec: tps6598x: Add trace event for IRQ
events
On Mon, Feb 15, 2021 at 12:46:42PM +0100, Guido Günther wrote:
> Allow to get irq event information via the tracing framework. This
> allows to inspect USB-C negotiation at runtime.
>
> Signed-off-by: Guido Günther <agx@...xcpu.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---
> drivers/usb/typec/Makefile | 3 +
> drivers/usb/typec/tps6598x.c | 9 ++-
> drivers/usb/typec/tps6598x.h | 64 ++++++++++++++++++++
> drivers/usb/typec/tps6598x_trace.h | 97 ++++++++++++++++++++++++++++++
> 4 files changed, 170 insertions(+), 3 deletions(-)
> create mode 100644 drivers/usb/typec/tps6598x.h
> create mode 100644 drivers/usb/typec/tps6598x_trace.h
>
> diff --git a/drivers/usb/typec/Makefile b/drivers/usb/typec/Makefile
> index d03b48c4b864..27aa12129190 100644
> --- a/drivers/usb/typec/Makefile
> +++ b/drivers/usb/typec/Makefile
> @@ -1,4 +1,7 @@
> # SPDX-License-Identifier: GPL-2.0
> +# define_trace.h needs to know how to find our header
> +CFLAGS_tps6598x.o := -I$(src)
> +
> obj-$(CONFIG_TYPEC) += typec.o
> typec-y := class.o mux.o bus.o
> obj-$(CONFIG_TYPEC) += altmodes/
> diff --git a/drivers/usb/typec/tps6598x.c b/drivers/usb/typec/tps6598x.c
> index 6e6ef6317523..bc34b35e909f 100644
> --- a/drivers/usb/typec/tps6598x.c
> +++ b/drivers/usb/typec/tps6598x.c
> @@ -6,6 +6,8 @@
> * Author: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> */
>
> +#include "tps6598x.h"
> +
> #include <linux/i2c.h>
> #include <linux/acpi.h>
> #include <linux/module.h>
> @@ -15,6 +17,9 @@
> #include <linux/usb/typec.h>
> #include <linux/usb/role.h>
>
> +#define CREATE_TRACE_POINTS
> +#include "tps6598x_trace.h"
> +
> /* Register offsets */
> #define TPS_REG_VID 0x00
> #define TPS_REG_MODE 0x03
> @@ -32,9 +37,6 @@
> #define TPS_REG_POWER_STATUS 0x3f
> #define TPS_REG_RX_IDENTITY_SOP 0x48
>
> -/* TPS_REG_INT_* bits */
> -#define TPS_REG_INT_PLUG_EVENT BIT(3)
> -
> /* TPS_REG_STATUS bits */
> #define TPS_STATUS_PLUG_PRESENT BIT(0)
> #define TPS_STATUS_ORIENTATION BIT(4)
> @@ -428,6 +430,7 @@ static irqreturn_t tps6598x_interrupt(int irq, void *data)
> dev_err(tps->dev, "%s: failed to read events\n", __func__);
> goto err_unlock;
> }
> + trace_tps6598x_irq(event1, event2);
>
> ret = tps6598x_read32(tps, TPS_REG_STATUS, &status);
> if (ret) {
> diff --git a/drivers/usb/typec/tps6598x.h b/drivers/usb/typec/tps6598x.h
> new file mode 100644
> index 000000000000..b83b8a6a1504
> --- /dev/null
> +++ b/drivers/usb/typec/tps6598x.h
> @@ -0,0 +1,64 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Driver for TI TPS6598x USB Power Delivery controller family
> + *
> + * Copyright (C) 2017, Intel Corporation
> + * Author: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> + */
> +
> +#include <linux/bits.h>
> +#include <linux/bitfield.h>
> +
> +#ifndef __TPS6598X_H__
> +#define __TPS6598X_H__
> +
> +
> +/* TPS_REG_INT_* bits */
> +#define TPS_REG_INT_USER_VID_ALT_MODE_OTHER_VDM BIT_ULL(27+32)
> +#define TPS_REG_INT_USER_VID_ALT_MODE_ATTN_VDM BIT_ULL(26+32)
> +#define TPS_REG_INT_USER_VID_ALT_MODE_EXIT BIT_ULL(25+32)
> +#define TPS_REG_INT_USER_VID_ALT_MODE_ENTERED BIT_ULL(24+32)
> +#define TPS_REG_INT_EXIT_MODES_COMPLETE BIT_ULL(20+32)
> +#define TPS_REG_INT_DISCOVER_MODES_COMPLETE BIT_ULL(19+32)
> +#define TPS_REG_INT_VDM_MSG_SENT BIT_ULL(18+32)
> +#define TPS_REG_INT_VDM_ENTERED_MODE BIT_ULL(17+32)
> +#define TPS_REG_INT_ERROR_UNABLE_TO_SOURCE BIT_ULL(14+32)
> +#define TPS_REG_INT_SRC_TRANSITION BIT_ULL(10+32)
> +#define TPS_REG_INT_ERROR_DISCHARGE_FAILED BIT_ULL(9+32)
> +#define TPS_REG_INT_ERROR_MESSAGE_DATA BIT_ULL(7+32)
> +#define TPS_REG_INT_ERROR_PROTOCOL_ERROR BIT_ULL(6+32)
> +#define TPS_REG_INT_ERROR_MISSING_GET_CAP_MESSAGE BIT_ULL(4+32)
> +#define TPS_REG_INT_ERROR_POWER_EVENT_OCCURRED BIT_ULL(3+32)
> +#define TPS_REG_INT_ERROR_CAN_PROVIDE_PWR_LATER BIT_ULL(2+32)
> +#define TPS_REG_INT_ERROR_CANNOT_PROVIDE_PWR BIT_ULL(1+32)
> +#define TPS_REG_INT_ERROR_DEVICE_INCOMPATIBLE BIT_ULL(0+32)
> +#define TPS_REG_INT_CMD2_COMPLETE BIT(31)
> +#define TPS_REG_INT_CMD1_COMPLETE BIT(30)
> +#define TPS_REG_INT_ADC_HIGH_THRESHOLD BIT(29)
> +#define TPS_REG_INT_ADC_LOW_THRESHOLD BIT(28)
> +#define TPS_REG_INT_PD_STATUS_UPDATE BIT(27)
> +#define TPS_REG_INT_STATUS_UPDATE BIT(26)
> +#define TPS_REG_INT_DATA_STATUS_UPDATE BIT(25)
> +#define TPS_REG_INT_POWER_STATUS_UPDATE BIT(24)
> +#define TPS_REG_INT_PP_SWITCH_CHANGED BIT(23)
> +#define TPS_REG_INT_HIGH_VOLTAGE_WARNING BIT(22)
> +#define TPS_REG_INT_USB_HOST_PRESENT_NO_LONGER BIT(21)
> +#define TPS_REG_INT_USB_HOST_PRESENT BIT(20)
> +#define TPS_REG_INT_GOTO_MIN_RECEIVED BIT(19)
> +#define TPS_REG_INT_PR_SWAP_REQUESTED BIT(17)
> +#define TPS_REG_INT_SINK_CAP_MESSAGE_READY BIT(15)
> +#define TPS_REG_INT_SOURCE_CAP_MESSAGE_READY BIT(14)
> +#define TPS_REG_INT_NEW_CONTRACT_AS_PROVIDER BIT(13)
> +#define TPS_REG_INT_NEW_CONTRACT_AS_CONSUMER BIT(12)
> +#define TPS_REG_INT_VDM_RECEIVED BIT(11)
> +#define TPS_REG_INT_ATTENTION_RECEIVED BIT(10)
> +#define TPS_REG_INT_OVERCURRENT BIT(9)
> +#define TPS_REG_INT_BIST BIT(8)
> +#define TPS_REG_INT_RDO_RECEIVED_FROM_SINK BIT(7)
> +#define TPS_REG_INT_DR_SWAP_COMPLETE BIT(5)
> +#define TPS_REG_INT_PR_SWAP_COMPLETE BIT(4)
> +#define TPS_REG_INT_PLUG_EVENT BIT(3)
> +#define TPS_REG_INT_HARD_RESET BIT(1)
> +#define TPS_REG_INT_PD_SOFT_RESET BIT(0)
> +
> +#endif /* __TPS6598X_H__ */
> diff --git a/drivers/usb/typec/tps6598x_trace.h b/drivers/usb/typec/tps6598x_trace.h
> new file mode 100644
> index 000000000000..4ec96e3b2c3e
> --- /dev/null
> +++ b/drivers/usb/typec/tps6598x_trace.h
> @@ -0,0 +1,97 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Driver for TI TPS6598x USB Power Delivery controller family
> + *
> + * Copyright (C) 2020 Purism SPC
> + * Author: Guido Günther <agx@...xcpu.org>
> + */
> +
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM tps6598x
> +
> +#if !defined(_TPS6598x_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TPS6598X_TRACE_H_
> +
> +#include "tps6598x.h"
> +
> +#include <linux/stringify.h>
> +#include <linux/types.h>
> +#include <linux/tracepoint.h>
> +
> +#define show_irq_flags(flags) \
> + __print_flags_u64(flags, "|", \
> + { TPS_REG_INT_PD_SOFT_RESET, "PD_SOFT_RESET" }, \
> + { TPS_REG_INT_HARD_RESET, "HARD_RESET" }, \
> + { TPS_REG_INT_PLUG_EVENT, "PLUG_EVENT" }, \
> + { TPS_REG_INT_PR_SWAP_COMPLETE, "PR_SWAP_COMPLETE" }, \
> + { TPS_REG_INT_DR_SWAP_COMPLETE, "DR_SWAP_COMPLETE" }, \
> + { TPS_REG_INT_RDO_RECEIVED_FROM_SINK, "RDO_RECEIVED_FROM_SINK" }, \
> + { TPS_REG_INT_BIST, "BIST" }, \
> + { TPS_REG_INT_OVERCURRENT, "OVERCURRENT" }, \
> + { TPS_REG_INT_ATTENTION_RECEIVED, "ATTENTION_RECEIVED" }, \
> + { TPS_REG_INT_VDM_RECEIVED, "VDM_RECEIVED" }, \
> + { TPS_REG_INT_NEW_CONTRACT_AS_CONSUMER, "NEW_CONTRACT_AS_CONSUMER" }, \
> + { TPS_REG_INT_NEW_CONTRACT_AS_PROVIDER, "NEW_CONTRACT_AS_PROVIDER" }, \
> + { TPS_REG_INT_SOURCE_CAP_MESSAGE_READY, "SOURCE_CAP_MESSAGE_READY" }, \
> + { TPS_REG_INT_SINK_CAP_MESSAGE_READY, "SINK_CAP_MESSAGE_READY" }, \
> + { TPS_REG_INT_PR_SWAP_REQUESTED, "PR_SWAP_REQUESTED" }, \
> + { TPS_REG_INT_GOTO_MIN_RECEIVED, "GOTO_MIN_RECEIVED" }, \
> + { TPS_REG_INT_USB_HOST_PRESENT, "USB_HOST_PRESENT" }, \
> + { TPS_REG_INT_USB_HOST_PRESENT_NO_LONGER, "USB_HOST_PRESENT_NO_LONGER" }, \
> + { TPS_REG_INT_HIGH_VOLTAGE_WARNING, "HIGH_VOLTAGE_WARNING" }, \
> + { TPS_REG_INT_PP_SWITCH_CHANGED, "PP_SWITCH_CHANGED" }, \
> + { TPS_REG_INT_POWER_STATUS_UPDATE, "POWER_STATUS_UPDATE" }, \
> + { TPS_REG_INT_DATA_STATUS_UPDATE, "DATA_STATUS_UPDATE" }, \
> + { TPS_REG_INT_STATUS_UPDATE, "STATUS_UPDATE" }, \
> + { TPS_REG_INT_PD_STATUS_UPDATE, "PD_STATUS_UPDATE" }, \
> + { TPS_REG_INT_ADC_LOW_THRESHOLD, "ADC_LOW_THRESHOLD" }, \
> + { TPS_REG_INT_ADC_HIGH_THRESHOLD, "ADC_HIGH_THRESHOLD" }, \
> + { TPS_REG_INT_CMD1_COMPLETE, "CMD1_COMPLETE" }, \
> + { TPS_REG_INT_CMD2_COMPLETE, "CMD2_COMPLETE" }, \
> + { TPS_REG_INT_ERROR_DEVICE_INCOMPATIBLE, "ERROR_DEVICE_INCOMPATIBLE" }, \
> + { TPS_REG_INT_ERROR_CANNOT_PROVIDE_PWR, "ERROR_CANNOT_PROVIDE_PWR" }, \
> + { TPS_REG_INT_ERROR_CAN_PROVIDE_PWR_LATER, "ERROR_CAN_PROVIDE_PWR_LATER" }, \
> + { TPS_REG_INT_ERROR_POWER_EVENT_OCCURRED, "ERROR_POWER_EVENT_OCCURRED" }, \
> + { TPS_REG_INT_ERROR_MISSING_GET_CAP_MESSAGE, "ERROR_MISSING_GET_CAP_MESSAGE" }, \
> + { TPS_REG_INT_ERROR_PROTOCOL_ERROR, "ERROR_PROTOCOL_ERROR" }, \
> + { TPS_REG_INT_ERROR_MESSAGE_DATA, "ERROR_MESSAGE_DATA" }, \
> + { TPS_REG_INT_ERROR_DISCHARGE_FAILED, "ERROR_DISCHARGE_FAILED" }, \
> + { TPS_REG_INT_SRC_TRANSITION, "SRC_TRANSITION" }, \
> + { TPS_REG_INT_ERROR_UNABLE_TO_SOURCE, "ERROR_UNABLE_TO_SOURCE" }, \
> + { TPS_REG_INT_VDM_ENTERED_MODE, "VDM_ENTERED_MODE" }, \
> + { TPS_REG_INT_VDM_MSG_SENT, "VDM_MSG_SENT" }, \
> + { TPS_REG_INT_DISCOVER_MODES_COMPLETE, "DISCOVER_MODES_COMPLETE" }, \
> + { TPS_REG_INT_EXIT_MODES_COMPLETE, "EXIT_MODES_COMPLETE" }, \
> + { TPS_REG_INT_USER_VID_ALT_MODE_ENTERED, "USER_VID_ALT_MODE_ENTERED" }, \
> + { TPS_REG_INT_USER_VID_ALT_MODE_EXIT, "USER_VID_ALT_MODE_EXIT" }, \
> + { TPS_REG_INT_USER_VID_ALT_MODE_ATTN_VDM, "USER_VID_ALT_MODE_ATTN_VDM" }, \
> + { TPS_REG_INT_USER_VID_ALT_MODE_OTHER_VDM, "USER_VID_ALT_MODE_OTHER_VDM" })
> +
> +TRACE_EVENT(tps6598x_irq,
> + TP_PROTO(u64 event1,
> + u64 event2),
> + TP_ARGS(event1, event2),
> +
> + TP_STRUCT__entry(
> + __field(u64, event1)
> + __field(u64, event2)
> + ),
> +
> + TP_fast_assign(
> + __entry->event1 = event1;
> + __entry->event2 = event2;
> + ),
> +
> + TP_printk("event1=%s, event2=%s",
> + show_irq_flags(__entry->event1),
> + show_irq_flags(__entry->event2))
> +);
> +
> +#endif /* _TPS6598X_TRACE_H_ */
> +
> +/* This part must be outside protection */
> +#undef TRACE_INCLUDE_PATH
> +#define TRACE_INCLUDE_FILE tps6598x_trace
> +#undef TRACE_INCLUDE_PATH
> +#define TRACE_INCLUDE_PATH .
> +#include <trace/define_trace.h>
> --
> 2.30.0
thanks,
--
heikki
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