sparc: Write to prom console using indirect buffer.

sparc64 systems have a restriction in that passing in buffer
addressses above 4GB to prom calls is not reliable.

We end up violating this when we do prom console writes, because we
use an on-stack buffer to translate '\n' into '\r\n'.

So instead, do this translation into an intermediate buffer, which is
in the kernel image and thus below 4GB, then pass that to the PROM
console write calls.

On the 32-bit side we don't have to deal with any of these issues, so
the new prom_console_write_buf() uses the existing prom_nbputchar()
implementation.  However we can now mark those routines static.

Since the 64-bit side completely uses new code we can delete the
putchar bits as they are now completely unused.

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 48 insertions, 25 deletions

diff --git a/arch/sparc/prom/console_32.c b/arch/sparc/prom/console_32.c
index 157019e..4886310 100644
--- a/arch/sparc/prom/console_32.c
+++ b/arch/sparc/prom/console_32.c
@@ -43,12 +43,14 @@ static int prom_nbputchar(const char *buf)
 	return i; /* Ugh, we could spin forever on unsupported proms ;( */
 }
 
-/* Blocking version of put character routine above. */
-void prom_putchar(const char *buf)
+void prom_console_write_buf(const char *buf, int len)
 {
-	while (1) {
-		int err = prom_nbputchar(buf);
-		if (!err)
-			break;
+	while (len) {
+		int n = prom_nbputchar(buf);
+		if (n)
+			continue;
+		len--;
+		buf++;
 	}
 }
+
diff --git a/arch/sparc/prom/console_64.c b/arch/sparc/prom/console_64.c
index 0da88d1..ed39e75 100644
--- a/arch/sparc/prom/console_64.c
+++ b/arch/sparc/prom/console_64.c
@@ -15,35 +15,34 @@
 
 extern int prom_stdin, prom_stdout;
 
-/* Non blocking put character to console device, returns -1 if
- * unsuccessful.
- */
-static int prom_nbputchar(const char *buf)
+static int __prom_console_write_buf(const char *buf, int len)
 {
 	unsigned long args[7];
+	int ret;
 
 	args[0] = (unsigned long) "write";
 	args[1] = 3;
 	args[2] = 1;
 	args[3] = (unsigned int) prom_stdout;
 	args[4] = (unsigned long) buf;
-	args[5] = 1;
+	args[5] = (unsigned int) len;
 	args[6] = (unsigned long) -1;
 
 	p1275_cmd_direct(args);
 
-	if (args[6] == 1)
-		return 0;
-	else
+	ret = (int) args[6];
+	if (ret < 0)
 		return -1;
+	return ret;
 }
 
-/* Blocking version of put character routine above. */
-void prom_putchar(const char *buf)
+void prom_console_write_buf(const char *buf, int len)
 {
-	while (1) {
-		int err = prom_nbputchar(buf);
-		if (!err)
-			break;
+	while (len) {
+		int n = __prom_console_write_buf(buf, len);
+		if (n < 0)
+			continue;
+		len -= n;
+		buf += len;
 	}
 }
diff --git a/arch/sparc/prom/printf.c b/arch/sparc/prom/printf.c
index 2403197..d9682f0 100644
--- a/arch/sparc/prom/printf.c
+++ b/arch/sparc/prom/printf.c
@@ -15,23 +15,45 @@
 
 #include <linux/kernel.h>
 #include <linux/compiler.h>
+#include <linux/spinlock.h>
 
 #include <asm/openprom.h>
 #include <asm/oplib.h>
 
+#define CONSOLE_WRITE_BUF_SIZE	1024
+
 static char ppbuf[1024];
+static char console_write_buf[CONSOLE_WRITE_BUF_SIZE];
+static DEFINE_RAW_SPINLOCK(console_write_lock);
 
 void notrace prom_write(const char *buf, unsigned int n)
 {
+	unsigned int dest_len;
+	unsigned long flags;
+	char *dest;
+
+	dest = console_write_buf;
+	raw_spin_lock_irqsave(&console_write_lock, flags);
+
+	dest_len = 0;
 	while (n-- != 0) {
-		char ch = *buf;
+		char ch = *buf++;
 		if (ch == '\n') {
-			char tmp = '\r';
-			prom_putchar(&tmp);
+			*dest++ = '\r';
+			dest_len++;
+		}
+		*dest++ = ch;
+		dest_len++;
+		if (dest_len >= CONSOLE_WRITE_BUF_SIZE - 1) {
+			prom_console_write_buf(console_write_buf, dest_len);
+			dest = console_write_buf;
+			dest_len = 0;
 		}
-		prom_putchar(buf);
-		buf++;
 	}
+	if (dest_len)
+		prom_console_write_buf(console_write_buf, dest_len);
+
+	raw_spin_unlock_irqrestore(&console_write_lock, flags);
 }
 
 void notrace prom_printf(const char *fmt, ...)