static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time,
char **buf, struct pstore_info *psi)
{
ssize_t size;
ssize_t ecc_notice_size;
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz;
prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
cxt->max_dump_cnt, id, type,
PSTORE_TYPE_DMESG, 1);
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
1, id, type, PSTORE_TYPE_CONSOLE, 0);
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
1, id, type, PSTORE_TYPE_FTRACE, 0);
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
1, id, type, PSTORE_TYPE_PMSG, 0);
if (!prz_ok(prz))
return 0;
/* TODO(kees): Bogus time for the moment. */
time->tv_sec = 0;
time->tv_nsec = 0;
size = persistent_ram_old_size(prz);
/* ECC correction notice */
ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
*buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL);
if (*buf == NULL)
return -ENOMEM;
memcpy(*buf, persistent_ram_old(prz), size);
persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
return size + ecc_notice_size;
}
void *persistent_trace_seq_start(struct seq_file *s, loff_t *pos)
{
struct persistent_trace_seq_data *data;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return NULL;
data->ptr = persistent_ram_old(persistent_trace);
data->size = persistent_ram_old_size(persistent_trace);
data->off = data->size % REC_SIZE;
data->off += *pos * REC_SIZE;
if (data->off + REC_SIZE > data->size) {
kfree(data);
return NULL;
}
return data;
}
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time,
char **buf, bool *compressed,
ssize_t *ecc_notice_size,
struct pstore_info *psi)
{
ssize_t size;
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz = NULL;
int header_length = 0;
/* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
* PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
* valid time stamps, so it is initialized to zero.
*/
time->tv_sec = 0;
time->tv_nsec = 0;
*compressed = false;
/* Find the next valid persistent_ram_zone for DMESG */
while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
prz = ramoops_get_next_prz(cxt->przs, &cxt->dump_read_cnt,
cxt->max_dump_cnt, id, type,
PSTORE_TYPE_DMESG, 1);
if (!prz_ok(prz))
continue;
header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
time, compressed);
/* Clear and skip this DMESG record if it has no valid header */
if (!header_length) {
persistent_ram_free_old(prz);
persistent_ram_zap(prz);
prz = NULL;
}
}
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
1, id, type, PSTORE_TYPE_CONSOLE, 0);
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->fprz, &cxt->ftrace_read_cnt,
1, id, type, PSTORE_TYPE_FTRACE, 0);
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
1, id, type, PSTORE_TYPE_PMSG, 0);
if (!prz_ok(prz))
return 0;
size = persistent_ram_old_size(prz) - header_length;
/* ECC correction notice */
*ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
*buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL);
if (*buf == NULL)
return -ENOMEM;
memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1);
return size;
}
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time,
char **buf, bool *compressed,
ssize_t *ecc_notice_size,
struct pstore_info *psi)
{
ssize_t size = 0;
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz = NULL;
int header_length = 0;
bool free_prz = false;
/* Ramoops headers provide time stamps for PSTORE_TYPE_DMESG, but
* PSTORE_TYPE_CONSOLE and PSTORE_TYPE_FTRACE don't currently have
* valid time stamps, so it is initialized to zero.
*/
time->tv_sec = 0;
time->tv_nsec = 0;
*compressed = false;
/* Find the next valid persistent_ram_zone for DMESG */
while (cxt->dump_read_cnt < cxt->max_dump_cnt && !prz) {
prz = ramoops_get_next_prz(cxt->dprzs, &cxt->dump_read_cnt,
cxt->max_dump_cnt, id, type,
PSTORE_TYPE_DMESG, 1);
if (!prz_ok(prz))
continue;
header_length = ramoops_read_kmsg_hdr(persistent_ram_old(prz),
time, compressed);
/* Clear and skip this DMESG record if it has no valid header */
if (!header_length) {
persistent_ram_free_old(prz);
persistent_ram_zap(prz);
prz = NULL;
}
}
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->cprz, &cxt->console_read_cnt,
1, id, type, PSTORE_TYPE_CONSOLE, 0);
if (!prz_ok(prz))
prz = ramoops_get_next_prz(&cxt->mprz, &cxt->pmsg_read_cnt,
1, id, type, PSTORE_TYPE_PMSG, 0);
/* ftrace is last since it may want to dynamically allocate memory. */
if (!prz_ok(prz)) {
if (!(cxt->flags & RAMOOPS_FLAG_FTRACE_PER_CPU)) {
prz = ramoops_get_next_prz(cxt->fprzs,
&cxt->ftrace_read_cnt, 1, id, type,
PSTORE_TYPE_FTRACE, 0);
} else {
/*
* Build a new dummy record which combines all the
* per-cpu records including metadata and ecc info.
*/
struct persistent_ram_zone *tmp_prz, *prz_next;
tmp_prz = kzalloc(sizeof(struct persistent_ram_zone),
GFP_KERNEL);
if (!tmp_prz)
return -ENOMEM;
free_prz = true;
while (cxt->ftrace_read_cnt < cxt->max_ftrace_cnt) {
prz_next = ramoops_get_next_prz(cxt->fprzs,
&cxt->ftrace_read_cnt,
cxt->max_ftrace_cnt, id,
type, PSTORE_TYPE_FTRACE, 0);
if (!prz_ok(prz_next))
continue;
tmp_prz->ecc_info = prz_next->ecc_info;
tmp_prz->corrected_bytes +=
prz_next->corrected_bytes;
tmp_prz->bad_blocks += prz_next->bad_blocks;
size = ftrace_log_combine(tmp_prz, prz_next);
if (size)
goto out;
}
*id = 0;
prz = tmp_prz;
}
}
if (!prz_ok(prz)) {
size = 0;
goto out;
}
size = persistent_ram_old_size(prz) - header_length;
/* ECC correction notice */
*ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
*buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL);
if (*buf == NULL) {
size = -ENOMEM;
goto out;
}
memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1);
out:
if (free_prz) {
kfree(prz->old_log);
kfree(prz);
}
return size;
}
static ssize_t ram_console_read_old(struct file *file, char __user *buf,
size_t len, loff_t *offset)
{
loff_t pos = *offset;
ssize_t count;
struct persistent_ram_zone *prz = ram_console_zone;
size_t old_log_size = persistent_ram_old_size(prz);
const char *old_log = persistent_ram_old(prz);
char *str;
int ret;
if (dmesg_restrict && !capable(CAP_SYSLOG))
return -EPERM;
/* Main last_kmsg log */
if (pos < old_log_size) {
count = min(len, (size_t)(old_log_size - pos));
if (copy_to_user(buf, old_log + pos, count))
return -EFAULT;
goto out;
}
/* ECC correction notice */
pos -= old_log_size;
count = persistent_ram_ecc_string(prz, NULL, 0);
if (pos < count) {
str = kmalloc(count, GFP_KERNEL);
if (!str)
return -ENOMEM;
persistent_ram_ecc_string(prz, str, count + 1);
count = min(len, (size_t)(count - pos));
ret = copy_to_user(buf, str + pos, count);
kfree(str);
str = NULL;
if (ret)
return -EFAULT;
goto out;
}
/* bootreason label */
pos -= count;
count = 1 + snprintf(NULL, 0, bootreason_label, bi_bootreason());
if (pos < count) {
str = kmalloc(count, GFP_KERNEL);
if (!str)
return -ENOMEM;
snprintf(str, count, bootreason_label, bi_bootreason());
count = min(len, (size_t)(count - pos));
ret = copy_to_user(buf, str + pos, count);
kfree(str);
if (ret)
return -EFAULT;
goto out;
}
/* Boot info passed through cmdline */
pos -= count;
if (pos < (bootinfo_size)) {
count = min(len, (size_t)(bootinfo_size - pos));
if (copy_to_user(buf, bootinfo + pos, count))
return -EFAULT;
goto out;
}
/* EOF */
return 0;
out:
*offset += count;
return count;
}
static ssize_t ram_console_read_old(struct file *file, char __user *buf,
size_t len, loff_t *offset)
{
loff_t pos = *offset;
ssize_t count;
struct persistent_ram_zone *prz = ram_console_zone;
size_t old_log_size = persistent_ram_old_size(prz);
const char *old_log = persistent_ram_old(prz);
char *str;
int ret;
if (dmesg_restrict && !capable(CAP_SYSLOG))
return -EPERM;
#if defined(CONFIG_HTC_DEBUG_RAMCONSOLE)
/* last bootloader log */
if (pos < bl_old_log_buf_size) {
count = min(len, (size_t)(bl_old_log_buf_size - pos));
if (copy_to_user(buf, bl_old_log_buf + pos, count))
return -EFAULT;
goto out;
}
pos -= bl_old_log_buf_size;
#endif
/* Main last_kmsg log */
if (pos < old_log_size) {
count = min(len, (size_t)(old_log_size - pos));
if (copy_to_user(buf, old_log + pos, count))
return -EFAULT;
goto out;
}
/* ECC correction notice */
pos -= old_log_size;
count = persistent_ram_ecc_string(prz, NULL, 0);
if (pos < count) {
str = kmalloc(count, GFP_KERNEL);
if (!str)
return -ENOMEM;
persistent_ram_ecc_string(prz, str, count + 1);
count = min(len, (size_t)(count - pos));
ret = copy_to_user(buf, str + pos, count);
kfree(str);
if (ret)
return -EFAULT;
goto out;
}
/* Append the boot reason required by Google */
pos -= count;
if (pos < rst_msg_buf_size) {
count = min(len, (size_t)(rst_msg_buf_size - pos));
if (copy_to_user(buf, rst_msg_buf + pos, count))
return -EFAULT;
goto out;
}
/* Boot info passed through pdata */
pos -= rst_msg_buf_size;
if (pos < bootinfo_size) {
count = min(len, (size_t)(bootinfo_size - pos));
if (copy_to_user(buf, bootinfo + pos, count))
return -EFAULT;
goto out;
}
#if defined(CONFIG_HTC_DEBUG_RAMCONSOLE)
/* bootloader log */
pos -= bootinfo_size;
if (pos < bl_log_buf_size) {
count = min(len, (size_t)(bl_log_buf_size - pos));
if (copy_to_user(buf, bl_log_buf + pos, count))
return -EFAULT;
goto out;
}
#endif
/* EOF */
return 0;
out:
*offset += count;
return count;
}
