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kernel_samsung_sm7125/kernel/trace/ipc_logging.c

942 lines
25 KiB

/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that 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 <asm/arch_timer.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/jiffies.h>
#include <linux/debugfs.h>
#include <linux/io.h>
#include <linux/idr.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/completion.h>
#include <linux/sched/clock.h>
#include <linux/ipc_logging.h>
#include "ipc_logging_private.h"
#define LOG_PAGE_DATA_SIZE sizeof(((struct ipc_log_page *)0)->data)
#define LOG_PAGE_FLAG (1 << 31)
static LIST_HEAD(ipc_log_context_list);
static DEFINE_RWLOCK(context_list_lock_lha1);
static void *get_deserialization_func(struct ipc_log_context *ilctxt,
int type);
static struct ipc_log_page *get_first_page(struct ipc_log_context *ilctxt)
{
struct ipc_log_page_header *p_pghdr;
struct ipc_log_page *pg = NULL;
if (!ilctxt)
return NULL;
p_pghdr = list_first_entry(&ilctxt->page_list,
struct ipc_log_page_header, list);
pg = container_of(p_pghdr, struct ipc_log_page, hdr);
return pg;
}
/**
* is_nd_read_empty - Returns true if no data is available to read in log
*
* @ilctxt: logging context
* @returns: > 1 if context is empty; 0 if not empty; <0 for failure
*
* This is for the debugfs read pointer which allows for a non-destructive read.
* There may still be data in the log, but it may have already been read.
*/
static int is_nd_read_empty(struct ipc_log_context *ilctxt)
{
if (!ilctxt)
return -EINVAL;
return ((ilctxt->nd_read_page == ilctxt->write_page) &&
(ilctxt->nd_read_page->hdr.nd_read_offset ==
ilctxt->write_page->hdr.write_offset));
}
/**
* is_read_empty - Returns true if no data is available in log
*
* @ilctxt: logging context
* @returns: > 1 if context is empty; 0 if not empty; <0 for failure
*
* This is for the actual log contents. If it is empty, then there
* is no data at all in the log.
*/
static int is_read_empty(struct ipc_log_context *ilctxt)
{
if (!ilctxt)
return -EINVAL;
return ((ilctxt->read_page == ilctxt->write_page) &&
(ilctxt->read_page->hdr.read_offset ==
ilctxt->write_page->hdr.write_offset));
}
/**
* is_nd_read_equal_read - Return true if the non-destructive read is equal to
* the destructive read
*
* @ilctxt: logging context
* @returns: true if nd read is equal to read; false otherwise
*/
static bool is_nd_read_equal_read(struct ipc_log_context *ilctxt)
{
uint16_t read_offset;
uint16_t nd_read_offset;
if (ilctxt->nd_read_page == ilctxt->read_page) {
read_offset = ilctxt->read_page->hdr.read_offset;
nd_read_offset = ilctxt->nd_read_page->hdr.nd_read_offset;
if (read_offset == nd_read_offset)
return true;
}
return false;
}
static struct ipc_log_page *get_next_page(struct ipc_log_context *ilctxt,
struct ipc_log_page *cur_pg)
{
struct ipc_log_page_header *p_pghdr;
struct ipc_log_page *pg = NULL;
if (!ilctxt || !cur_pg)
return NULL;
if (ilctxt->last_page == cur_pg)
return ilctxt->first_page;
p_pghdr = list_first_entry(&cur_pg->hdr.list,
struct ipc_log_page_header, list);
pg = container_of(p_pghdr, struct ipc_log_page, hdr);
return pg;
}
/**
* ipc_log_read - do non-destructive read of the log
*
* @ilctxt: Logging context
* @data: Data pointer to receive the data
* @data_size: Number of bytes to read (must be <= bytes available in log)
*
* This read will update a runtime read pointer, but will not affect the actual
* contents of the log which allows for reading the logs continuously while
* debugging and if the system crashes, then the full logs can still be
* extracted.
*/
static void ipc_log_read(struct ipc_log_context *ilctxt,
void *data, int data_size)
{
int bytes_to_read;
bytes_to_read = MIN(LOG_PAGE_DATA_SIZE
- ilctxt->nd_read_page->hdr.nd_read_offset,
data_size);
memcpy(data, (ilctxt->nd_read_page->data +
ilctxt->nd_read_page->hdr.nd_read_offset), bytes_to_read);
if (bytes_to_read != data_size) {
/* not enough space, wrap read to next page */
ilctxt->nd_read_page->hdr.nd_read_offset = 0;
ilctxt->nd_read_page = get_next_page(ilctxt,
ilctxt->nd_read_page);
if (WARN_ON(ilctxt->nd_read_page == NULL))
return;
memcpy((data + bytes_to_read),
(ilctxt->nd_read_page->data +
ilctxt->nd_read_page->hdr.nd_read_offset),
(data_size - bytes_to_read));
bytes_to_read = (data_size - bytes_to_read);
}
ilctxt->nd_read_page->hdr.nd_read_offset += bytes_to_read;
}
/**
* ipc_log_drop - do destructive read of the log
*
* @ilctxt: Logging context
* @data: Data pointer to receive the data (or NULL)
* @data_size: Number of bytes to read (must be <= bytes available in log)
*/
static void ipc_log_drop(struct ipc_log_context *ilctxt, void *data,
int data_size)
{
int bytes_to_read;
bool push_nd_read;
bytes_to_read = MIN(LOG_PAGE_DATA_SIZE
- ilctxt->read_page->hdr.read_offset,
data_size);
if (data)
memcpy(data, (ilctxt->read_page->data +
ilctxt->read_page->hdr.read_offset), bytes_to_read);
if (bytes_to_read != data_size) {
/* not enough space, wrap read to next page */
push_nd_read = is_nd_read_equal_read(ilctxt);
ilctxt->read_page->hdr.read_offset = 0;
if (push_nd_read) {
ilctxt->read_page->hdr.nd_read_offset = 0;
ilctxt->read_page = get_next_page(ilctxt,
ilctxt->read_page);
if (WARN_ON(ilctxt->read_page == NULL))
return;
ilctxt->nd_read_page = ilctxt->read_page;
} else {
ilctxt->read_page = get_next_page(ilctxt,
ilctxt->read_page);
if (WARN_ON(ilctxt->read_page == NULL))
return;
}
if (data)
memcpy((data + bytes_to_read),
(ilctxt->read_page->data +
ilctxt->read_page->hdr.read_offset),
(data_size - bytes_to_read));
bytes_to_read = (data_size - bytes_to_read);
}
/* update non-destructive read pointer if necessary */
push_nd_read = is_nd_read_equal_read(ilctxt);
ilctxt->read_page->hdr.read_offset += bytes_to_read;
ilctxt->write_avail += data_size;
if (push_nd_read)
ilctxt->nd_read_page->hdr.nd_read_offset += bytes_to_read;
}
/**
* msg_read - Reads a message.
*
* If a message is read successfully, then the message context
* will be set to:
* .hdr message header .size and .type values
* .offset beginning of message data
*
* @ilctxt Logging context
* @ectxt Message context
*
* @returns 0 - no message available; >0 message size; <0 error
*/
static int msg_read(struct ipc_log_context *ilctxt,
struct encode_context *ectxt)
{
struct tsv_header hdr;
if (!ectxt)
return -EINVAL;
if (is_nd_read_empty(ilctxt))
return 0;
ipc_log_read(ilctxt, &hdr, sizeof(hdr));
ectxt->hdr.type = hdr.type;
ectxt->hdr.size = hdr.size;
ectxt->offset = sizeof(hdr);
ipc_log_read(ilctxt, (ectxt->buff + ectxt->offset),
(int)hdr.size);
return sizeof(hdr) + (int)hdr.size;
}
/**
* msg_drop - Drops a message.
*
* @ilctxt Logging context
*/
static void msg_drop(struct ipc_log_context *ilctxt)
{
struct tsv_header hdr;
if (!is_read_empty(ilctxt)) {
ipc_log_drop(ilctxt, &hdr, sizeof(hdr));
ipc_log_drop(ilctxt, NULL, (int)hdr.size);
}
}
/*
* Commits messages to the FIFO. If the FIFO is full, then enough
* messages are dropped to create space for the new message.
*/
void ipc_log_write(void *ctxt, struct encode_context *ectxt)
{
struct ipc_log_context *ilctxt = (struct ipc_log_context *)ctxt;
int bytes_to_write;
unsigned long flags;
if (!ilctxt || !ectxt) {
pr_err("%s: Invalid ipc_log or encode context\n", __func__);
return;
}
read_lock_irqsave(&context_list_lock_lha1, flags);
spin_lock(&ilctxt->context_lock_lhb1);
while (ilctxt->write_avail <= ectxt->offset)
msg_drop(ilctxt);
bytes_to_write = MIN(LOG_PAGE_DATA_SIZE
- ilctxt->write_page->hdr.write_offset,
ectxt->offset);
memcpy((ilctxt->write_page->data +
ilctxt->write_page->hdr.write_offset),
ectxt->buff, bytes_to_write);
if (bytes_to_write != ectxt->offset) {
uint64_t t_now = sched_clock();
ilctxt->write_page->hdr.write_offset += bytes_to_write;
ilctxt->write_page->hdr.end_time = t_now;
ilctxt->write_page = get_next_page(ilctxt, ilctxt->write_page);
if (WARN_ON(ilctxt->write_page == NULL)) {
spin_unlock(&ilctxt->context_lock_lhb1);
read_unlock_irqrestore(&context_list_lock_lha1, flags);
return;
}
ilctxt->write_page->hdr.write_offset = 0;
ilctxt->write_page->hdr.start_time = t_now;
memcpy((ilctxt->write_page->data +
ilctxt->write_page->hdr.write_offset),
(ectxt->buff + bytes_to_write),
(ectxt->offset - bytes_to_write));
bytes_to_write = (ectxt->offset - bytes_to_write);
}
ilctxt->write_page->hdr.write_offset += bytes_to_write;
ilctxt->write_avail -= ectxt->offset;
complete(&ilctxt->read_avail);
spin_unlock(&ilctxt->context_lock_lhb1);
read_unlock_irqrestore(&context_list_lock_lha1, flags);
}
EXPORT_SYMBOL(ipc_log_write);
/*
* Starts a new message after which you can add serialized data and
* then complete the message by calling msg_encode_end().
*/
void msg_encode_start(struct encode_context *ectxt, uint32_t type)
{
if (!ectxt) {
pr_err("%s: Invalid encode context\n", __func__);
return;
}
ectxt->hdr.type = type;
ectxt->hdr.size = 0;
ectxt->offset = sizeof(ectxt->hdr);
}
EXPORT_SYMBOL(msg_encode_start);
/*
* Completes the message
*/
void msg_encode_end(struct encode_context *ectxt)
{
if (!ectxt) {
pr_err("%s: Invalid encode context\n", __func__);
return;
}
/* finalize data size */
ectxt->hdr.size = ectxt->offset - sizeof(ectxt->hdr);
memcpy(ectxt->buff, &ectxt->hdr, sizeof(ectxt->hdr));
}
EXPORT_SYMBOL(msg_encode_end);
/*
* Helper function used to write data to a message context.
*
* @ectxt context initialized by calling msg_encode_start()
* @data data to write
* @size number of bytes of data to write
*/
static inline int tsv_write_data(struct encode_context *ectxt,
void *data, uint32_t size)
{
if (!ectxt) {
pr_err("%s: Invalid encode context\n", __func__);
return -EINVAL;
}
if ((ectxt->offset + size) > MAX_MSG_SIZE) {
pr_err("%s: No space to encode further\n", __func__);
return -EINVAL;
}
memcpy((void *)(ectxt->buff + ectxt->offset), data, size);
ectxt->offset += size;
return 0;
}
/*
* Helper function that writes a type to the context.
*
* @ectxt context initialized by calling msg_encode_start()
* @type primitive type
* @size size of primitive in bytes
*/
static inline int tsv_write_header(struct encode_context *ectxt,
uint32_t type, uint32_t size)
{
struct tsv_header hdr;
hdr.type = (unsigned char)type;
hdr.size = (unsigned char)size;
return tsv_write_data(ectxt, &hdr, sizeof(hdr));
}
/*
* Writes the current timestamp count.
*
* @ectxt context initialized by calling msg_encode_start()
*/
int tsv_timestamp_write(struct encode_context *ectxt)
{
int ret;
uint64_t t_now = sched_clock();
ret = tsv_write_header(ectxt, TSV_TYPE_TIMESTAMP, sizeof(t_now));
if (ret)
return ret;
return tsv_write_data(ectxt, &t_now, sizeof(t_now));
}
EXPORT_SYMBOL(tsv_timestamp_write);
/*
* Writes the current QTimer timestamp count.
*
* @ectxt context initialized by calling msg_encode_start()
*/
int tsv_qtimer_write(struct encode_context *ectxt)
{
int ret;
uint64_t t_now = arch_counter_get_cntvct();
ret = tsv_write_header(ectxt, TSV_TYPE_QTIMER, sizeof(t_now));
if (ret)
return ret;
return tsv_write_data(ectxt, &t_now, sizeof(t_now));
}
EXPORT_SYMBOL(tsv_qtimer_write);
/*
* Writes a data pointer.
*
* @ectxt context initialized by calling msg_encode_start()
* @pointer pointer value to write
*/
int tsv_pointer_write(struct encode_context *ectxt, void *pointer)
{
int ret;
ret = tsv_write_header(ectxt, TSV_TYPE_POINTER, sizeof(pointer));
if (ret)
return ret;
return tsv_write_data(ectxt, &pointer, sizeof(pointer));
}
EXPORT_SYMBOL(tsv_pointer_write);
/*
* Writes a 32-bit integer value.
*
* @ectxt context initialized by calling msg_encode_start()
* @n integer to write
*/
int tsv_int32_write(struct encode_context *ectxt, int32_t n)
{
int ret;
ret = tsv_write_header(ectxt, TSV_TYPE_INT32, sizeof(n));
if (ret)
return ret;
return tsv_write_data(ectxt, &n, sizeof(n));
}
EXPORT_SYMBOL(tsv_int32_write);
/*
* Writes a byte array.
*
* @ectxt context initialized by calling msg_write_start()
* @data Beginning address of data
* @data_size Size of data to be written
*/
int tsv_byte_array_write(struct encode_context *ectxt,
void *data, int data_size)
{
int ret;
ret = tsv_write_header(ectxt, TSV_TYPE_BYTE_ARRAY, data_size);
if (ret)
return ret;
return tsv_write_data(ectxt, data, data_size);
}
EXPORT_SYMBOL(tsv_byte_array_write);
/*
* Helper function to log a string
*
* @ilctxt ipc_log_context created using ipc_log_context_create()
* @fmt Data specified using format specifiers
*/
int ipc_log_string(void *ilctxt, const char *fmt, ...)
{
struct encode_context ectxt;
int avail_size, data_size, hdr_size = sizeof(struct tsv_header);
va_list arg_list;
if (!ilctxt)
return -EINVAL;
msg_encode_start(&ectxt, TSV_TYPE_STRING);
tsv_timestamp_write(&ectxt);
tsv_qtimer_write(&ectxt);
avail_size = (MAX_MSG_SIZE - (ectxt.offset + hdr_size));
va_start(arg_list, fmt);
data_size = vscnprintf((ectxt.buff + ectxt.offset + hdr_size),
avail_size, fmt, arg_list);
va_end(arg_list);
tsv_write_header(&ectxt, TSV_TYPE_BYTE_ARRAY, data_size);
ectxt.offset += data_size;
msg_encode_end(&ectxt);
ipc_log_write(ilctxt, &ectxt);
return 0;
}
EXPORT_SYMBOL(ipc_log_string);
/**
* ipc_log_extract - Reads and deserializes log
*
* @ctxt: logging context
* @buff: buffer to receive the data
* @size: size of the buffer
* @returns: 0 if no data read; >0 number of bytes read; < 0 error
*
* If no data is available to be read, then the ilctxt::read_avail
* completion is reinitialized. This allows clients to block
* until new log data is save.
*/
int ipc_log_extract(void *ctxt, char *buff, int size)
{
struct encode_context ectxt;
struct decode_context dctxt;
void (*deserialize_func)(struct encode_context *ectxt,
struct decode_context *dctxt);
struct ipc_log_context *ilctxt = (struct ipc_log_context *)ctxt;
unsigned long flags;
int ret;
if (size < MAX_MSG_DECODED_SIZE)
return -EINVAL;
dctxt.output_format = OUTPUT_DEBUGFS;
dctxt.buff = buff;
dctxt.size = size;
read_lock_irqsave(&context_list_lock_lha1, flags);
spin_lock(&ilctxt->context_lock_lhb1);
if (ilctxt->destroyed) {
ret = -EIO;
goto done;
}
while (dctxt.size >= MAX_MSG_DECODED_SIZE &&
!is_nd_read_empty(ilctxt)) {
msg_read(ilctxt, &ectxt);
deserialize_func = get_deserialization_func(ilctxt,
ectxt.hdr.type);
spin_unlock(&ilctxt->context_lock_lhb1);
read_unlock_irqrestore(&context_list_lock_lha1, flags);
if (deserialize_func)
deserialize_func(&ectxt, &dctxt);
else
pr_err("%s: unknown message 0x%x\n",
__func__, ectxt.hdr.type);
read_lock_irqsave(&context_list_lock_lha1, flags);
spin_lock(&ilctxt->context_lock_lhb1);
}
ret = size - dctxt.size;
if (ret == 0) {
if (!ilctxt->destroyed)
reinit_completion(&ilctxt->read_avail);
else
ret = -EIO;
}
done:
spin_unlock(&ilctxt->context_lock_lhb1);
read_unlock_irqrestore(&context_list_lock_lha1, flags);
return ret;
}
EXPORT_SYMBOL(ipc_log_extract);
/*
* Helper function used to read data from a message context.
*
* @ectxt context initialized by calling msg_read()
* @data data to read
* @size number of bytes of data to read
*/
static void tsv_read_data(struct encode_context *ectxt,
void *data, uint32_t size)
{
if (WARN_ON((ectxt->offset + size) > MAX_MSG_SIZE)) {
memcpy(data, (ectxt->buff + ectxt->offset),
MAX_MSG_SIZE - ectxt->offset - 1);
ectxt->offset += MAX_MSG_SIZE - ectxt->offset - 1;
return;
}
memcpy(data, (ectxt->buff + ectxt->offset), size);
ectxt->offset += size;
}
/*
* Helper function that reads a type from the context and updates the
* context pointers.
*
* @ectxt context initialized by calling msg_read()
* @hdr type header
*/
static void tsv_read_header(struct encode_context *ectxt,
struct tsv_header *hdr)
{
if (WARN_ON((ectxt->offset + sizeof(*hdr)) > MAX_MSG_SIZE)) {
memcpy(hdr, (ectxt->buff + ectxt->offset),
MAX_MSG_SIZE - ectxt->offset - 1);
ectxt->offset += MAX_MSG_SIZE - ectxt->offset - 1;
return;
}
memcpy(hdr, (ectxt->buff + ectxt->offset), sizeof(*hdr));
ectxt->offset += sizeof(*hdr);
}
/*
* Reads a timestamp.
*
* @ectxt context initialized by calling msg_read()
* @dctxt deserialization context
* @format output format (appended to %6u.09u timestamp format)
*/
void tsv_timestamp_read(struct encode_context *ectxt,
struct decode_context *dctxt, const char *format)
{
struct tsv_header hdr;
uint64_t val;
unsigned long nanosec_rem;
tsv_read_header(ectxt, &hdr);
if (WARN_ON(hdr.type != TSV_TYPE_TIMESTAMP))
return;
tsv_read_data(ectxt, &val, sizeof(val));
nanosec_rem = do_div(val, 1000000000U);
IPC_SPRINTF_DECODE(dctxt, "[%6u.%09lu%s/",
(unsigned int)val, nanosec_rem, format);
}
EXPORT_SYMBOL(tsv_timestamp_read);
/*
* Reads a QTimer timestamp.
*
* @ectxt context initialized by calling msg_read()
* @dctxt deserialization context
* @format output format (appended to %#18llx timestamp format)
*/
void tsv_qtimer_read(struct encode_context *ectxt,
struct decode_context *dctxt, const char *format)
{
struct tsv_header hdr;
uint64_t val;
tsv_read_header(ectxt, &hdr);
if (WARN_ON(hdr.type != TSV_TYPE_QTIMER))
return;
tsv_read_data(ectxt, &val, sizeof(val));
/*
* This gives 16 hex digits of output. The # prefix prepends
* a 0x, and these characters count as part of the number.
*/
IPC_SPRINTF_DECODE(dctxt, "%#18llx]%s", val, format);
}
EXPORT_SYMBOL(tsv_qtimer_read);
/*
* Reads a data pointer.
*
* @ectxt context initialized by calling msg_read()
* @dctxt deserialization context
* @format output format
*/
void tsv_pointer_read(struct encode_context *ectxt,
struct decode_context *dctxt, const char *format)
{
struct tsv_header hdr;
void *val;
tsv_read_header(ectxt, &hdr);
if (WARN_ON(hdr.type != TSV_TYPE_POINTER))
return;
tsv_read_data(ectxt, &val, sizeof(val));
IPC_SPRINTF_DECODE(dctxt, format, val);
}
EXPORT_SYMBOL(tsv_pointer_read);
/*
* Reads a 32-bit integer value.
*
* @ectxt context initialized by calling msg_read()
* @dctxt deserialization context
* @format output format
*/
int32_t tsv_int32_read(struct encode_context *ectxt,
struct decode_context *dctxt, const char *format)
{
struct tsv_header hdr;
int32_t val;
tsv_read_header(ectxt, &hdr);
if (WARN_ON(hdr.type != TSV_TYPE_INT32))
return -EINVAL;
tsv_read_data(ectxt, &val, sizeof(val));
IPC_SPRINTF_DECODE(dctxt, format, val);
return val;
}
EXPORT_SYMBOL(tsv_int32_read);
/*
* Reads a byte array/string.
*
* @ectxt context initialized by calling msg_read()
* @dctxt deserialization context
* @format output format
*/
void tsv_byte_array_read(struct encode_context *ectxt,
struct decode_context *dctxt, const char *format)
{
struct tsv_header hdr;
tsv_read_header(ectxt, &hdr);
if (WARN_ON(hdr.type != TSV_TYPE_BYTE_ARRAY))
return;
tsv_read_data(ectxt, dctxt->buff, hdr.size);
dctxt->buff += hdr.size;
dctxt->size -= hdr.size;
}
EXPORT_SYMBOL(tsv_byte_array_read);
int add_deserialization_func(void *ctxt, int type,
void (*dfunc)(struct encode_context *,
struct decode_context *))
{
struct ipc_log_context *ilctxt = (struct ipc_log_context *)ctxt;
struct dfunc_info *df_info;
unsigned long flags;
if (!ilctxt || !dfunc)
return -EINVAL;
df_info = kmalloc(sizeof(struct dfunc_info), GFP_KERNEL);
if (!df_info)
return -ENOSPC;
read_lock_irqsave(&context_list_lock_lha1, flags);
spin_lock(&ilctxt->context_lock_lhb1);
df_info->type = type;
df_info->dfunc = dfunc;
list_add_tail(&df_info->list, &ilctxt->dfunc_info_list);
spin_unlock(&ilctxt->context_lock_lhb1);
read_unlock_irqrestore(&context_list_lock_lha1, flags);
return 0;
}
EXPORT_SYMBOL(add_deserialization_func);
static void *get_deserialization_func(struct ipc_log_context *ilctxt,
int type)
{
struct dfunc_info *df_info = NULL;
if (!ilctxt)
return NULL;
list_for_each_entry(df_info, &ilctxt->dfunc_info_list, list) {
if (df_info->type == type)
return df_info->dfunc;
}
return NULL;
}
/**
* ipc_log_context_create: Create a debug log context if context does not exist.
* Should not be called from atomic context
*
* @max_num_pages: Number of pages of logging space required (max. 10)
* @mod_name : Name of the directory entry under DEBUGFS
* @user_version : Version number of user-defined message formats
*
* returns context id on success, NULL on failure
*/
void *ipc_log_context_create(int max_num_pages,
const char *mod_name, uint16_t user_version)
{
struct ipc_log_context *ctxt = NULL, *tmp;
struct ipc_log_page *pg = NULL;
int page_cnt;
unsigned long flags;
/* check if ipc ctxt already exists */
read_lock_irq(&context_list_lock_lha1);
list_for_each_entry(tmp, &ipc_log_context_list, list)
if (!strcmp(tmp->name, mod_name)) {
ctxt = tmp;
break;
}
read_unlock_irq(&context_list_lock_lha1);
if (ctxt)
return ctxt;
ctxt = kzalloc(sizeof(struct ipc_log_context), GFP_KERNEL);
if (!ctxt)
return 0;
init_completion(&ctxt->read_avail);
INIT_LIST_HEAD(&ctxt->page_list);
INIT_LIST_HEAD(&ctxt->dfunc_info_list);
spin_lock_init(&ctxt->context_lock_lhb1);
for (page_cnt = 0; page_cnt < max_num_pages; page_cnt++) {
pg = kzalloc(sizeof(struct ipc_log_page), GFP_KERNEL);
if (!pg)
goto release_ipc_log_context;
pg->hdr.log_id = (uint64_t)(uintptr_t)ctxt;
pg->hdr.page_num = LOG_PAGE_FLAG | page_cnt;
pg->hdr.ctx_offset = (int64_t)((uint64_t)(uintptr_t)ctxt -
(uint64_t)(uintptr_t)&pg->hdr);
/* set magic last to signal that page init is complete */
pg->hdr.magic = IPC_LOGGING_MAGIC_NUM;
pg->hdr.nmagic = ~(IPC_LOGGING_MAGIC_NUM);
spin_lock_irqsave(&ctxt->context_lock_lhb1, flags);
list_add_tail(&pg->hdr.list, &ctxt->page_list);
spin_unlock_irqrestore(&ctxt->context_lock_lhb1, flags);
}
ctxt->log_id = (uint64_t)(uintptr_t)ctxt;
ctxt->version = IPC_LOG_VERSION;
strlcpy(ctxt->name, mod_name, IPC_LOG_MAX_CONTEXT_NAME_LEN);
ctxt->user_version = user_version;
ctxt->first_page = get_first_page(ctxt);
ctxt->last_page = pg;
ctxt->write_page = ctxt->first_page;
ctxt->read_page = ctxt->first_page;
ctxt->nd_read_page = ctxt->first_page;
ctxt->write_avail = max_num_pages * LOG_PAGE_DATA_SIZE;
ctxt->header_size = sizeof(struct ipc_log_page_header);
kref_init(&ctxt->refcount);
ctxt->destroyed = false;
create_ctx_debugfs(ctxt, mod_name);
/* set magic last to signal context init is complete */
ctxt->magic = IPC_LOG_CONTEXT_MAGIC_NUM;
ctxt->nmagic = ~(IPC_LOG_CONTEXT_MAGIC_NUM);
write_lock_irqsave(&context_list_lock_lha1, flags);
list_add_tail(&ctxt->list, &ipc_log_context_list);
write_unlock_irqrestore(&context_list_lock_lha1, flags);
return (void *)ctxt;
release_ipc_log_context:
while (page_cnt-- > 0) {
pg = get_first_page(ctxt);
list_del(&pg->hdr.list);
kfree(pg);
}
kfree(ctxt);
return 0;
}
EXPORT_SYMBOL(ipc_log_context_create);
void ipc_log_context_free(struct kref *kref)
{
struct ipc_log_context *ilctxt = container_of(kref,
struct ipc_log_context, refcount);
struct ipc_log_page *pg = NULL;
while (!list_empty(&ilctxt->page_list)) {
pg = get_first_page(ilctxt);
list_del(&pg->hdr.list);
kfree(pg);
}
kfree(ilctxt);
}
/*
* Destroy debug log context
*
* @ctxt: debug log context created by calling ipc_log_context_create API.
*/
int ipc_log_context_destroy(void *ctxt)
{
struct ipc_log_context *ilctxt = (struct ipc_log_context *)ctxt;
struct dfunc_info *df_info = NULL, *tmp = NULL;
unsigned long flags;
if (!ilctxt)
return 0;
debugfs_remove_recursive(ilctxt->dent);
spin_lock(&ilctxt->context_lock_lhb1);
ilctxt->destroyed = true;
complete_all(&ilctxt->read_avail);
list_for_each_entry_safe(df_info, tmp, &ilctxt->dfunc_info_list, list) {
list_del(&df_info->list);
kfree(df_info);
}
spin_unlock(&ilctxt->context_lock_lhb1);
write_lock_irqsave(&context_list_lock_lha1, flags);
list_del(&ilctxt->list);
write_unlock_irqrestore(&context_list_lock_lha1, flags);
ipc_log_context_put(ilctxt);
return 0;
}
EXPORT_SYMBOL(ipc_log_context_destroy);
static int __init ipc_logging_init(void)
{
check_and_create_debugfs();
return 0;
}
module_init(ipc_logging_init);
MODULE_DESCRIPTION("ipc logging");
MODULE_LICENSE("GPL v2");