/*
- * nmi.c - Safe printk in NMI context
+ * printk_safe.c - Safe printk in NMI context
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* were handled or when IRQs are blocked.
*/
DEFINE_PER_CPU(printk_func_t, printk_func) = vprintk_default;
-static int printk_nmi_irq_ready;
+static int printk_safe_irq_ready;
atomic_t nmi_message_lost;
-#define NMI_LOG_BUF_LEN ((1 << CONFIG_NMI_LOG_BUF_SHIFT) - \
+#define SAFE_LOG_BUF_LEN ((1 << CONFIG_PRINTK_SAFE_LOG_BUF_SHIFT) - \
sizeof(atomic_t) - sizeof(struct irq_work))
-struct nmi_seq_buf {
+struct printk_safe_seq_buf {
atomic_t len; /* length of written data */
struct irq_work work; /* IRQ work that flushes the buffer */
- unsigned char buffer[NMI_LOG_BUF_LEN];
+ unsigned char buffer[SAFE_LOG_BUF_LEN];
};
-static DEFINE_PER_CPU(struct nmi_seq_buf, nmi_print_seq);
+static DEFINE_PER_CPU(struct printk_safe_seq_buf, nmi_print_seq);
/*
* Safe printk() for NMI context. It uses a per-CPU buffer to
*/
static int vprintk_nmi(const char *fmt, va_list args)
{
- struct nmi_seq_buf *s = this_cpu_ptr(&nmi_print_seq);
+ struct printk_safe_seq_buf *s = this_cpu_ptr(&nmi_print_seq);
int add = 0;
size_t len;
goto again;
/* Get flushed in a more safe context. */
- if (add && printk_nmi_irq_ready) {
+ if (add && printk_safe_irq_ready) {
/* Make sure that IRQ work is really initialized. */
smp_rmb();
irq_work_queue(&s->work);
return add;
}
-static void printk_nmi_flush_line(const char *text, int len)
+static void printk_safe_flush_line(const char *text, int len)
{
/*
* The buffers are flushed in NMI only on panic. The messages must
printk_deferred("%.*s", len, text);
else
printk("%.*s", len, text);
-
}
/* printk part of the temporary buffer line by line */
-static int printk_nmi_flush_buffer(const char *start, size_t len)
+static int printk_safe_flush_buffer(const char *start, size_t len)
{
const char *c, *end;
bool header;
/* Print line by line. */
while (c < end) {
if (*c == '\n') {
- printk_nmi_flush_line(start, c - start + 1);
+ printk_safe_flush_line(start, c - start + 1);
start = ++c;
header = true;
continue;
continue;
}
- printk_nmi_flush_line(start, c - start);
+ printk_safe_flush_line(start, c - start);
start = c++;
header = true;
continue;
if (start < end && !header) {
static const char newline[] = KERN_CONT "\n";
- printk_nmi_flush_line(start, end - start);
- printk_nmi_flush_line(newline, strlen(newline));
+ printk_safe_flush_line(start, end - start);
+ printk_safe_flush_line(newline, strlen(newline));
}
return len;
* Flush data from the associated per_CPU buffer. The function
* can be called either via IRQ work or independently.
*/
-static void __printk_nmi_flush(struct irq_work *work)
+static void __printk_safe_flush(struct irq_work *work)
{
static raw_spinlock_t read_lock =
__RAW_SPIN_LOCK_INITIALIZER(read_lock);
- struct nmi_seq_buf *s = container_of(work, struct nmi_seq_buf, work);
+ struct printk_safe_seq_buf *s =
+ container_of(work, struct printk_safe_seq_buf, work);
unsigned long flags;
size_t len;
int i;
* buffer size.
*/
if ((i && i >= len) || len > sizeof(s->buffer)) {
- const char *msg = "printk_nmi_flush: internal error\n";
+ const char *msg = "printk_safe_flush: internal error\n";
- printk_nmi_flush_line(msg, strlen(msg));
+ printk_safe_flush_line(msg, strlen(msg));
len = 0;
}
/* Make sure that data has been written up to the @len */
smp_rmb();
- i += printk_nmi_flush_buffer(s->buffer + i, len - i);
+ i += printk_safe_flush_buffer(s->buffer + i, len - i);
/*
* Check that nothing has got added in the meantime and truncate
}
/**
- * printk_nmi_flush - flush all per-cpu nmi buffers.
+ * printk_safe_flush - flush all per-cpu nmi buffers.
*
* The buffers are flushed automatically via IRQ work. This function
* is useful only when someone wants to be sure that all buffers have
* been flushed at some point.
*/
-void printk_nmi_flush(void)
+void printk_safe_flush(void)
{
int cpu;
for_each_possible_cpu(cpu)
- __printk_nmi_flush(&per_cpu(nmi_print_seq, cpu).work);
+ __printk_safe_flush(&per_cpu(nmi_print_seq, cpu).work);
}
/**
- * printk_nmi_flush_on_panic - flush all per-cpu nmi buffers when the system
+ * printk_safe_flush_on_panic - flush all per-cpu nmi buffers when the system
* goes down.
*
- * Similar to printk_nmi_flush() but it can be called even in NMI context when
+ * Similar to printk_safe_flush() but it can be called even in NMI context when
* the system goes down. It does the best effort to get NMI messages into
* the main ring buffer.
*
* Note that it could try harder when there is only one CPU online.
*/
-void printk_nmi_flush_on_panic(void)
+void printk_safe_flush_on_panic(void)
{
/*
* Make sure that we could access the main ring buffer.
raw_spin_lock_init(&logbuf_lock);
}
- printk_nmi_flush();
+ printk_safe_flush();
}
-void __init printk_nmi_init(void)
+void __init printk_safe_init(void)
{
int cpu;
for_each_possible_cpu(cpu) {
- struct nmi_seq_buf *s = &per_cpu(nmi_print_seq, cpu);
+ struct printk_safe_seq_buf *s = &per_cpu(nmi_print_seq, cpu);
- init_irq_work(&s->work, __printk_nmi_flush);
+ init_irq_work(&s->work, __printk_safe_flush);
}
/* Make sure that IRQ works are initialized before enabling. */
smp_wmb();
- printk_nmi_irq_ready = 1;
+ printk_safe_irq_ready = 1;
/* Flush pending messages that did not have scheduled IRQ works. */
- printk_nmi_flush();
+ printk_safe_flush();
}
void printk_nmi_enter(void)
projects / thirdparty / kernel / linux.git / commitdiff
