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#include <linux/version.h>
#include <linux/module.h>
#include "ipanic.h"
#include "ipanic_version.h"
u8 *log_temp;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0)
/*
* The function is used to dump kernel log after *Linux 3.5*
*/
size_t log_rest;
u8 *log_idx;
int ipanic_kmsg_dump3(struct kmsg_dumper *dumper, char *buf, size_t len)
{
size_t rc = 0;
size_t sum = 0;
/* if log_rest is no 0, it means that there some bytes left by previous log entry need to write to buf */
if (log_rest != 0) {
memcpy(buf, log_idx, log_rest);
sum += log_rest;
log_rest = 0;
}
while (kmsg_dump_get_line_nolock(dumper, false, log_temp, len, &rc)
&& dumper->cur_seq <= dumper->next_seq) {
if (sum + rc >= len) {
memcpy(buf + sum, log_temp, len - sum);
log_rest = rc - (len - sum);
log_idx = log_temp + (len - sum);
sum += (len - sum);
return len;
}
memcpy(buf + sum, log_temp, rc);
sum += rc;
}
return sum;
}
EXPORT_SYMBOL(ipanic_kmsg_dump3);
#else
extern int log_buf_copy2(char *dest, int dest_len, int log_copy_start, int log_copy_end);
#endif
void ipanic_klog_region(struct kmsg_dumper *dumper)
{
static struct ipanic_log_index next = { 0 };
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 5, 0)
#define __LOG_BUF_LEN (1 << CONFIG_LOG_BUF_SHIFT)
/* tricky usage of dump->list for log_start/log_end index */
dumper->list.prev =
next.value ? (struct list_head *)next.value : (struct list_head *)(log_end -
__LOG_BUF_LEN);
dumper->list.next = (struct list_head *)log_end;
next.value = log_end;
LOGD("kernel log region: [%x,%x]", (int)dumper->list.prev, (int)dumper->list.next);
#else
dumper->cur_idx = next.seq ? next.idx : log_first_idx;
dumper->cur_seq = next.seq ? next.seq : log_first_seq;
dumper->next_idx = log_next_idx;
dumper->next_seq = log_next_seq;
next.idx = log_next_idx;
next.seq = log_next_seq;
LOGD("kernel log region: [%x:%llx,%x:%llx]", dumper->cur_idx, dumper->cur_seq,
dumper->next_idx, dumper->next_seq);
#endif
}
int ipanic_klog_buffer(void *data, unsigned char *buffer, size_t sz_buf)
{
int rc = 0;
struct kmsg_dumper *dumper = (struct kmsg_dumper *)data;
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 5, 0)
rc = log_buf_copy2(buffer, sz_buf, (int)dumper->list.prev, (int)dumper->list.next);
if (rc < 0)
rc = -1;
else
dumper->list.prev = (struct list_head *)(rc + (int)dumper->list.prev);
#else
dumper->active = true;
rc = ipanic_kmsg_dump3(dumper, buffer, sz_buf);
if (rc < 0)
rc = -1;
#endif
return rc;
}
void ipanic_log_temp_init(void)
{
log_temp = (u8 *) __get_free_page(GFP_KERNEL);
}
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