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mei: me: add io register tracing

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To make debugging a bit easier we add me register
access tracing
<debugfs>/tracing/events/mei/mei_reg_{read,write}

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2015-02-10 10:39:33 +02:00 committed by Greg Kroah-Hartman
parent 381a58c709
commit a0a927d06d
4 changed files with 129 additions and 4 deletions
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3
drivers/misc/mei/Makefile
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@ -21,3 +21,6 @@ mei-me-objs += hw-me.o
obj-$(CONFIG_INTEL_MEI_TXE) += mei-txe.o
mei-txe-objs := pci-txe.o
mei-txe-objs += hw-txe.o
mei-$(CONFIG_EVENT_TRACING) += mei-trace.o
CFLAGS_mei-trace.o = -I$(src)

31
drivers/misc/mei/hw-me.c
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@ -25,6 +25,8 @@
#include "hw-me.h"
#include "hw-me-regs.h"
#include "mei-trace.h"
/**
* mei_me_reg_read - Reads 32bit data from the mei device
*
@ -86,7 +88,12 @@ static inline void mei_me_hcbww_write(struct mei_device *dev, u32 data)
*/
static inline u32 mei_me_mecsr_read(const struct mei_device *dev)
{
return mei_me_reg_read(to_me_hw(dev), ME_CSR_HA);
u32 reg;
reg = mei_me_reg_read(to_me_hw(dev), ME_CSR_HA);
trace_mei_reg_read(dev->dev, "ME_CSR_HA", ME_CSR_HA, reg);
return reg;
}
/**
@ -98,7 +105,12 @@ static inline u32 mei_me_mecsr_read(const struct mei_device *dev)
*/
static inline u32 mei_hcsr_read(const struct mei_device *dev)
{
return mei_me_reg_read(to_me_hw(dev), H_CSR);
u32 reg;
reg = mei_me_reg_read(to_me_hw(dev), H_CSR);
trace_mei_reg_read(dev->dev, "H_CSR", H_CSR, reg);
return reg;
}
/**
@ -109,6 +121,7 @@ static inline u32 mei_hcsr_read(const struct mei_device *dev)
*/
static inline void mei_hcsr_write(struct mei_device *dev, u32 reg)
{
trace_mei_reg_write(dev->dev, "H_CSR", H_CSR, reg);
mei_me_reg_write(to_me_hw(dev), H_CSR, reg);
}
@ -555,9 +568,14 @@ static int mei_me_read_slots(struct mei_device *dev, unsigned char *buffer,
static void mei_me_pg_enter(struct mei_device *dev)
{
struct mei_me_hw *hw = to_me_hw(dev);
u32 reg = mei_me_reg_read(hw, H_HPG_CSR);
u32 reg;
reg = mei_me_reg_read(hw, H_HPG_CSR);
trace_mei_reg_read(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
reg |= H_HPG_CSR_PGI;
trace_mei_reg_write(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
mei_me_reg_write(hw, H_HPG_CSR, reg);
}
@ -569,11 +587,16 @@ static void mei_me_pg_enter(struct mei_device *dev)
static void mei_me_pg_exit(struct mei_device *dev)
{
struct mei_me_hw *hw = to_me_hw(dev);
u32 reg = mei_me_reg_read(hw, H_HPG_CSR);
u32 reg;
reg = mei_me_reg_read(hw, H_HPG_CSR);
trace_mei_reg_read(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
WARN(!(reg & H_HPG_CSR_PGI), "PGI is not set\n");
reg |= H_HPG_CSR_PGIHEXR;
trace_mei_reg_write(dev->dev, "H_HPG_CSR", H_HPG_CSR, reg);
mei_me_reg_write(hw, H_HPG_CSR, reg);
}

25
drivers/misc/mei/mei-trace.c Normal file
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@ -0,0 +1,25 @@
/*
*
* Intel Management Engine Interface (Intel MEI) Linux driver
* Copyright (c) 2015, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <linux/module.h>
/* sparse doesn't like tracepoint macros */
#ifndef __CHECKER__
#define CREATE_TRACE_POINTS
#include "mei-trace.h"
EXPORT_TRACEPOINT_SYMBOL(mei_reg_read);
EXPORT_TRACEPOINT_SYMBOL(mei_reg_write);
#endif /* __CHECKER__ */

74
drivers/misc/mei/mei-trace.h Normal file
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@ -0,0 +1,74 @@
/*
*
* Intel Management Engine Interface (Intel MEI) Linux driver
* Copyright (c) 2015, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#if !defined(_MEI_TRACE_H_) || defined(TRACE_HEADER_MULTI_READ)
#define _MEI_TRACE_H_
#include <linux/stringify.h>
#include <linux/types.h>
#include <linux/tracepoint.h>
#undef TRACE_SYSTEM
#define TRACE_SYSTEM mei
#define TRACE_SYSTEM_STRING __stringify(TRACE_SYSTEM)
TRACE_EVENT(mei_reg_read,
TP_PROTO(const struct device *dev, const char *reg, u32 offs, u32 val),
TP_ARGS(dev, reg, offs, val),
TP_STRUCT__entry(
__string(dev, dev_name(dev))
__field(const char *, reg)
__field(u32, offs)
__field(u32, val)
),
TP_fast_assign(
__assign_str(dev, dev_name(dev))
__entry->reg = reg;
__entry->offs = offs;
__entry->val = val;
),
TP_printk("[%s] read %s:[%#x] = %#x",
__get_str(dev), __entry->reg, __entry->offs, __entry->val)
);
TRACE_EVENT(mei_reg_write,
TP_PROTO(const struct device *dev, const char *reg, u32 offs, u32 val),
TP_ARGS(dev, reg, offs, val),
TP_STRUCT__entry(
__string(dev, dev_name(dev))
__field(const char *, reg)
__field(u32, offs)
__field(u32, val)
),
TP_fast_assign(
__assign_str(dev, dev_name(dev))
__entry->reg = reg;
__entry->offs = offs;
__entry->val = val;
),
TP_printk("[%s] write %s[%#x] = %#x)",
__get_str(dev), __entry->reg, __entry->offs, __entry->val)
);
#endif /* _MEI_TRACE_H_ */
/* This part must be outside protection */
#undef TRACE_INCLUDE_PATH
#undef TRACE_INCLUDE_FILE
#define TRACE_INCLUDE_PATH .
#define TRACE_INCLUDE_FILE mei-trace
#include <trace/define_trace.h>