static int
salinfo_log_clear(struct salinfo_data *data, int cpu)
{
sal_log_record_header_t *rh;
data->state = STATE_NO_DATA;
if (!test_bit(cpu, &data->cpu_event))
return 0;
down(&data->sem);
clear_bit(cpu, &data->cpu_event);
if (data->saved_num) {
unsigned long flags;
spin_lock_irqsave(&data_saved_lock, flags);
shift1_data_saved(data, data->saved_num - 1 );
data->saved_num = 0;
spin_unlock_irqrestore(&data_saved_lock, flags);
}
rh = (sal_log_record_header_t *)(data->log_buffer);
/* Corrected errors have already been cleared from SAL */
if (rh->severity != sal_log_severity_corrected)
call_on_cpu(cpu, salinfo_log_clear_cpu, data);
/* clearing a record may make a new record visible */
salinfo_log_new_read(cpu, data);
if (data->state == STATE_LOG_RECORD &&
!test_and_set_bit(cpu, &data->cpu_event))
up(&data->sem);
return 0;
}
static int
salinfo_log_clear(struct salinfo_data *data, int cpu)
{
sal_log_record_header_t *rh;
unsigned long flags;
spin_lock_irqsave(&data_saved_lock, flags);
data->state = STATE_NO_DATA;
if (!cpumask_test_cpu(cpu, &data->cpu_event)) {
spin_unlock_irqrestore(&data_saved_lock, flags);
return 0;
}
cpumask_clear_cpu(cpu, &data->cpu_event);
if (data->saved_num) {
shift1_data_saved(data, data->saved_num - 1);
data->saved_num = 0;
}
spin_unlock_irqrestore(&data_saved_lock, flags);
rh = (sal_log_record_header_t *)(data->log_buffer);
/* Corrected errors have already been cleared from SAL */
if (rh->severity != sal_log_severity_corrected)
work_on_cpu_safe(cpu, salinfo_log_clear_cpu, data);
/* clearing a record may make a new record visible */
salinfo_log_new_read(cpu, data);
if (data->state == STATE_LOG_RECORD) {
spin_lock_irqsave(&data_saved_lock, flags);
cpumask_set_cpu(cpu, &data->cpu_event);
wake_up_interruptible(&data->read_wait);
spin_unlock_irqrestore(&data_saved_lock, flags);
}
return 0;
}
static int
salinfo_log_clear(struct salinfo_data *data, int cpu)
{
data->state = STATE_NO_DATA;
if (!test_bit(cpu, &data->cpu_event))
return 0;
down(&data->sem);
clear_bit(cpu, &data->cpu_event);
if (data->saved_num) {
unsigned long flags;
spin_lock_irqsave(&data_saved_lock, flags);
shift1_data_saved(data, data->saved_num - 1 );
data->saved_num = 0;
spin_unlock_irqrestore(&data_saved_lock, flags);
}
/* ia64_mca_log_sal_error_record or salinfo_log_read_cpu already cleared
* CPE and CMC errors
*/
if (data->type != SAL_INFO_TYPE_CPE && data->type != SAL_INFO_TYPE_CMC)
call_on_cpu(cpu, salinfo_log_clear_cpu, data);
/* clearing a record may make a new record visible */
salinfo_log_new_read(cpu, data);
if (data->state == STATE_LOG_RECORD &&
!test_and_set_bit(cpu, &data->cpu_event))
up(&data->sem);
return 0;
}
/* This routine is invoked in interrupt context. Note: mca.c enables
* interrupts before calling this code for CMC/CPE. MCA and INIT events are
* not irq safe, do not call any routines that use spinlocks, they may deadlock.
* MCA and INIT records are recorded, a timer event will look for any
* outstanding events and wake up the user space code.
*
* The buffer passed from mca.c points to the output from ia64_log_get. This is
* a persistent buffer but its contents can change between the interrupt and
* when user space processes the record. Save the record id to identify
* changes.
*/
void
salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
{
struct salinfo_data *data = salinfo_data + type;
struct salinfo_data_saved *data_saved;
unsigned long flags = 0;
int i;
int saved_size = ARRAY_SIZE(data->data_saved);
BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
if (irqsafe)
spin_lock_irqsave(&data_saved_lock, flags);
for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
if (!data_saved->buffer)
break;
}
if (i == saved_size) {
if (!data->saved_num) {
shift1_data_saved(data, 0);
data_saved = data->data_saved + saved_size - 1;
} else
data_saved = NULL;
}
if (data_saved) {
data_saved->cpu = smp_processor_id();
data_saved->id = ((sal_log_record_header_t *)buffer)->id;
data_saved->size = size;
if (irqsafe && (data_saved->buffer = kmalloc(size, GFP_ATOMIC))) {
memcpy(data_saved->buffer, buffer, size);
data_saved->kmalloced = 1;
} else {
data_saved->buffer = buffer;
data_saved->kmalloced = 0;
}
}
if (irqsafe)
spin_unlock_irqrestore(&data_saved_lock, flags);
if (!test_and_set_bit(smp_processor_id(), &data->cpu_event)) {
if (irqsafe)
up(&data->sem);
}
}
/* This routine is invoked in interrupt context. Note: mca.c enables
* interrupts before calling this code for CMC/CPE. MCA and INIT events are
* not irq safe, do not call any routines that use spinlocks, they may deadlock.
* MCA and INIT records are recorded, a timer event will look for any
* outstanding events and wake up the user space code.
*
* The buffer passed from mca.c points to the output from ia64_log_get. This is
* a persistent buffer but its contents can change between the interrupt and
* when user space processes the record. Save the record id to identify
* changes. If the buffer is NULL then just update the bitmap.
*/
void
salinfo_log_wakeup(int type, u8 *buffer, u64 size, int irqsafe)
{
struct salinfo_data *data = salinfo_data + type;
struct salinfo_data_saved *data_saved;
unsigned long flags = 0;
int i;
int saved_size = ARRAY_SIZE(data->data_saved);
BUG_ON(type >= ARRAY_SIZE(salinfo_log_name));
if (irqsafe)
spin_lock_irqsave(&data_saved_lock, flags);
if (buffer) {
for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
if (!data_saved->buffer)
break;
}
if (i == saved_size) {
if (!data->saved_num) {
shift1_data_saved(data, 0);
data_saved = data->data_saved + saved_size - 1;
} else
data_saved = NULL;
}
if (data_saved) {
data_saved->cpu = smp_processor_id();
data_saved->id = ((sal_log_record_header_t *)buffer)->id;
data_saved->size = size;
data_saved->buffer = buffer;
}
}
cpu_set(smp_processor_id(), data->cpu_event);
if (irqsafe) {
salinfo_work_to_do(data);
spin_unlock_irqrestore(&data_saved_lock, flags);
}
}
static void
salinfo_log_new_read(int cpu, struct salinfo_data *data)
{
struct salinfo_data_saved *data_saved;
unsigned long flags;
int i;
int saved_size = ARRAY_SIZE(data->data_saved);
data->saved_num = 0;
spin_lock_irqsave(&data_saved_lock, flags);
retry:
for (i = 0, data_saved = data->data_saved; i < saved_size; ++i, ++data_saved) {
if (data_saved->buffer && data_saved->cpu == cpu) {
sal_log_record_header_t *rh = (sal_log_record_header_t *)(data_saved->buffer);
data->log_size = data_saved->size;
memcpy(data->log_buffer, rh, data->log_size);
barrier(); /* id check must not be moved */
if (rh->id == data_saved->id) {
data->saved_num = i+1;
break;
}
/* saved record changed by mca.c since interrupt, discard it */
shift1_data_saved(data, i);
goto retry;
}
}
spin_unlock_irqrestore(&data_saved_lock, flags);
if (!data->saved_num)
call_on_cpu(cpu, salinfo_log_read_cpu, data);
if (!data->log_size) {
data->state = STATE_NO_DATA;
clear_bit(cpu, &data->cpu_event);
} else {
data->state = STATE_LOG_RECORD;
}
}
