339 lines
9.5 KiB
C
339 lines
9.5 KiB
C
/*
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* Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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* Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list
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* of conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "los_hilog.h"
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#include "los_init.h"
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#include "los_mp.h"
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#include "los_mux.h"
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#include "los_process_pri.h"
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#include "los_task_pri.h"
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#include "fs/fs.h"
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#include "los_vm_map.h"
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#include "los_vm_lock.h"
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#include "user_copy.h"
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#define HILOG_BUFFER 4096
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#define DRIVER_MODE 0666
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#define HILOG_DRIVER "/dev/hilog"
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struct HiLogEntry {
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unsigned int len;
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unsigned int hdrSize;
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unsigned int pid : 16;
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unsigned int taskId : 16;
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unsigned int sec;
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unsigned int nsec;
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unsigned int reserved;
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char msg[0];
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};
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ssize_t HilogRead(struct file *filep, char __user *buf, size_t count);
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ssize_t HilogWrite(struct file *filep, const char __user *buf, size_t count);
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int HiLogOpen(struct file *filep);
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int HiLogClose(struct file *filep);
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static ssize_t HiLogWrite(struct file *filep, const char *buffer, size_t bufLen);
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static ssize_t HiLogRead(struct file *filep, char *buffer, size_t bufLen);
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STATIC struct file_operations_vfs g_hilogFops = {
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HiLogOpen, /* open */
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HiLogClose, /* close */
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HiLogRead, /* read */
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HiLogWrite, /* write */
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NULL, /* seek */
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NULL, /* ioctl */
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NULL, /* mmap */
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#ifndef CONFIG_DISABLE_POLL
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NULL, /* poll */
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#endif
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NULL, /* unlink */
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};
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struct HiLogCharDevice {
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int flag;
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LosMux mtx;
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unsigned char *buffer;
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wait_queue_head_t wq;
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size_t writeOffset;
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size_t headOffset;
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size_t size;
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size_t count;
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} g_hiLogDev;
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static inline unsigned char *HiLogBufferHead(void)
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{
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return g_hiLogDev.buffer + g_hiLogDev.headOffset;
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}
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int HiLogOpen(struct file *filep)
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{
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(void)filep;
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return 0;
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}
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int HiLogClose(struct file *filep)
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{
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(void)filep;
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return 0;
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}
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static void HiLogBufferInc(size_t sz)
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{
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if (g_hiLogDev.size + sz <= HILOG_BUFFER) {
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g_hiLogDev.size += sz;
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g_hiLogDev.writeOffset += sz;
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g_hiLogDev.writeOffset %= HILOG_BUFFER;
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g_hiLogDev.count++;
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}
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}
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static void HiLogBufferDec(size_t sz)
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{
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if (g_hiLogDev.size >= sz) {
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g_hiLogDev.size -= sz;
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g_hiLogDev.headOffset += sz;
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g_hiLogDev.headOffset %= HILOG_BUFFER;
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g_hiLogDev.count--;
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}
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}
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static int HiLogBufferCopy(unsigned char *dst, unsigned dstLen, unsigned char *src, size_t srcLen)
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{
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int retval = -1;
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size_t minLen = (dstLen > srcLen) ? srcLen : dstLen;
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if (LOS_IsUserAddressRange((VADDR_T)(UINTPTR)dst, minLen) &&
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LOS_IsUserAddressRange((VADDR_T)(UINTPTR)src, minLen)) {
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return retval;
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}
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if (LOS_IsUserAddressRange((VADDR_T)(UINTPTR)dst, minLen)) {
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retval = LOS_ArchCopyToUser(dst, src, minLen);
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} else if (LOS_IsUserAddressRange((VADDR_T)(UINTPTR)src, minLen)) {
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retval = LOS_ArchCopyFromUser(dst, src, minLen);
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} else {
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retval = memcpy_s(dst, dstLen, src, srcLen);
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}
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return retval;
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}
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static int HiLogReadRingBuffer(unsigned char *buffer, size_t bufLen)
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{
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size_t retval;
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size_t bufLeft = HILOG_BUFFER - g_hiLogDev.headOffset;
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if (bufLeft > bufLen) {
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retval = HiLogBufferCopy(buffer, bufLen, HiLogBufferHead(), bufLen);
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} else {
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retval = HiLogBufferCopy(buffer, bufLen, HiLogBufferHead(), bufLeft);
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if (retval < 0) {
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return retval;
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}
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retval = HiLogBufferCopy(buffer + bufLeft, bufLen - bufLeft, g_hiLogDev.buffer, bufLen - bufLeft);
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}
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return retval;
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}
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static ssize_t HiLogRead(struct file *filep, char *buffer, size_t bufLen)
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{
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size_t retval;
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struct HiLogEntry header;
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(void)filep;
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wait_event_interruptible(g_hiLogDev.wq, (g_hiLogDev.size > 0));
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(VOID)LOS_MuxAcquire(&g_hiLogDev.mtx);
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retval = HiLogReadRingBuffer((unsigned char *)&header, sizeof(header));
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if (retval < 0) {
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retval = -EINVAL;
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goto out;
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}
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if (bufLen < header.len + sizeof(header)) {
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dprintf("buffer too small,bufLen=%d, header.len=%d,%d\n", bufLen, header.len, header.hdrSize);
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retval = -ENOMEM;
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goto out;
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}
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HiLogBufferDec(sizeof(header));
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retval = HiLogBufferCopy((unsigned char *)buffer, bufLen, (unsigned char *)&header, sizeof(header));
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if (retval < 0) {
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retval = -EINVAL;
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goto out;
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}
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retval = HiLogReadRingBuffer((unsigned char *)(buffer + sizeof(header)), header.len);
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if (retval < 0) {
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retval = -EINVAL;
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goto out;
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}
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HiLogBufferDec(header.len);
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retval = header.len + sizeof(header);
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out:
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(VOID)LOS_MuxRelease(&g_hiLogDev.mtx);
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return retval;
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}
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static int HiLogWriteRingBuffer(unsigned char *buffer, size_t bufLen)
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{
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int retval;
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size_t bufLeft = HILOG_BUFFER - g_hiLogDev.writeOffset;
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if (bufLen > bufLeft) {
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retval = HiLogBufferCopy(g_hiLogDev.buffer + g_hiLogDev.writeOffset, bufLeft, buffer, bufLeft);
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if (retval) {
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return -1;
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}
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retval = HiLogBufferCopy(g_hiLogDev.buffer, HILOG_BUFFER, buffer + bufLeft, bufLen - bufLeft);
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} else {
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retval = HiLogBufferCopy(g_hiLogDev.buffer + g_hiLogDev.writeOffset, bufLeft, buffer, bufLen);
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}
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if (retval < 0) {
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return -1;
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}
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return 0;
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}
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static void HiLogHeadInit(struct HiLogEntry *header, size_t len)
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{
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struct timespec now;
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int ret;
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ret = clock_gettime(CLOCK_REALTIME, &now);
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if (ret != 0) {
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dprintf("In %s line %d,clock_gettime fail", __FUNCTION__, __LINE__);
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return;
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}
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header->len = len;
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header->pid = LOS_GetCurrProcessID();
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header->taskId = LOS_CurTaskIDGet();
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header->sec = now.tv_sec;
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header->nsec = now.tv_nsec;
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header->hdrSize = sizeof(struct HiLogEntry);
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}
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static void HiLogCoverOldLog(size_t bufLen)
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{
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int retval;
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struct HiLogEntry header;
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size_t totalSize = bufLen + sizeof(struct HiLogEntry);
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while (totalSize + g_hiLogDev.size > HILOG_BUFFER) {
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retval = HiLogReadRingBuffer((unsigned char *)&header, sizeof(header));
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if (retval < 0) {
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break;
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}
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HiLogBufferDec(sizeof(header));
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HiLogBufferDec(header.len);
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}
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}
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int HiLogWriteInternal(const char *buffer, size_t bufLen)
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{
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struct HiLogEntry header;
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int retval;
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LosTaskCB *runTask = (LosTaskCB *)OsCurrTaskGet();
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if ((g_hiLogDev.buffer == NULL) || (OS_INT_ACTIVE) || (runTask->taskStatus & OS_TASK_FLAG_SYSTEM_TASK)) {
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PRINTK("%s\n", buffer);
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return -EAGAIN;
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}
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(VOID)LOS_MuxAcquire(&g_hiLogDev.mtx);
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HiLogCoverOldLog(bufLen);
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HiLogHeadInit(&header, bufLen);
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retval = HiLogWriteRingBuffer((unsigned char *)&header, sizeof(header));
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if (retval) {
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retval = -ENODATA;
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goto out;
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}
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HiLogBufferInc(sizeof(header));
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retval = HiLogWriteRingBuffer((unsigned char *)(buffer), header.len);
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if (retval) {
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retval = -ENODATA;
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goto out;
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}
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HiLogBufferInc(header.len);
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retval = header.len;
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out:
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(VOID)LOS_MuxRelease(&g_hiLogDev.mtx);
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if (retval > 0) {
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wake_up_interruptible(&g_hiLogDev.wq);
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}
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if (retval < 0) {
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dprintf("write fail retval=%d\n", retval);
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}
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return retval;
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}
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static ssize_t HiLogWrite(struct file *filep, const char *buffer, size_t bufLen)
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{
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(void)filep;
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if (bufLen + sizeof(struct HiLogEntry) > HILOG_BUFFER) {
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dprintf("input too large\n");
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return -ENOMEM;
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}
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return HiLogWriteInternal(buffer, bufLen);
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}
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static void HiLogDeviceInit(void)
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{
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g_hiLogDev.buffer = LOS_MemAlloc((VOID *)OS_SYS_MEM_ADDR, HILOG_BUFFER);
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if (g_hiLogDev.buffer == NULL) {
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dprintf("In %s line %d,LOS_MemAlloc fail", __FUNCTION__, __LINE__);
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}
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init_waitqueue_head(&g_hiLogDev.wq);
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LOS_MuxInit(&g_hiLogDev.mtx, NULL);
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g_hiLogDev.writeOffset = 0;
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g_hiLogDev.headOffset = 0;
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g_hiLogDev.size = 0;
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g_hiLogDev.count = 0;
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}
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int OsHiLogDriverInit(VOID)
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{
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HiLogDeviceInit();
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return register_driver(HILOG_DRIVER, &g_hilogFops, DRIVER_MODE, NULL);
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}
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LOS_MODULE_INIT(OsHiLogDriverInit, LOS_INIT_LEVEL_KMOD_EXTENDED);
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