Messages in this thread Patch in this message | | | Date | Sat, 6 Oct 2007 23:19:51 +0200 | From | "Miguel Botón" <> | Subject | Re: [PATCH] Cute feature: colored printk output |
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On 10/5/07, Jan Engelhardt <jengelh@computergmbh.de> wrote: > > Colored kernel message output > > Let's work more on Linux's cuteness! [http://lkml.org/lkml/2007/10/4/431] > The following patch makes it possible to give kernel messages a > selectable color which helps to distinguish it from other noise, > such as boot messages. NetBSD has it, OpenBSD has it, FreeBSD to some > extent, so I think Linux should too. > > Inspired by cko (http://freshmeat.net/p/cko/), but independently > written, later contributed forth and back. > > Already posted at: http://lkml.org/lkml/2007/4/1/162
Pretty interesting feature. I modified your lastest patch a little bit so now you can set the message color for each log level in the kernel config.
diff -ruN linux-2.6.23.orig/arch/x86_64/kernel/early_printk.c linux-2.6.23/arch/x86_64/kernel/early_printk.c --- linux-2.6.23.orig/arch/x86_64/kernel/early_printk.c 2007-10-02 05:24:52.000000000 +0200 +++ linux-2.6.23/arch/x86_64/kernel/early_printk.c 2007-10-06 23:00:39.000000000 +0200 @@ -20,7 +20,8 @@ static int max_ypos = 25, max_xpos = 80; static int current_ypos = 25, current_xpos = 0;
-static void early_vga_write(struct console *con, const char *str, unsigned n) +static void early_vga_write(struct console *con, const char *str, unsigned n, + unsigned int loglevel) { char c; int i, k, j; @@ -89,7 +90,8 @@ return timeout ? 0 : -1; }
-static void early_serial_write(struct console *con, const char *s, unsigned n) +static void early_serial_write(struct console *con, const char *s, unsigned n, + unsigned int loglevel) { while (*s && n-- > 0) { if (*s == '\n') @@ -185,7 +187,8 @@ simnow_fd = simnow(XOPEN, (unsigned long)fn, O_WRONLY|O_APPEND|O_CREAT, 0644); }
-static void simnow_write(struct console *con, const char *s, unsigned n) +static void simnow_write(struct console *con, const char *s, unsigned n, + unsigned int loglevel) { simnow(XWRITE, simnow_fd, (unsigned long)s, n); } @@ -209,7 +212,7 @@
va_start(ap,fmt); n = vscnprintf(buf,512,fmt,ap); - early_console->write(early_console,buf,n); + early_console->write(early_console, buf, n, 0); va_end(ap); }
diff -ruN linux-2.6.23.orig/drivers/char/Kconfig linux-2.6.23/drivers/char/Kconfig --- linux-2.6.23.orig/drivers/char/Kconfig 2007-10-02 05:24:52.000000000 +0200 +++ linux-2.6.23/drivers/char/Kconfig 2007-10-06 23:06:55.000000000 +0200 @@ -58,6 +58,111 @@
If unsure, say Y.
+config VT_CKO + bool "Colored kernel message output" + depends on VT_CONSOLE + ---help--- + This option enables kernel messages to be emitted in + colors other than the default. + + The color value you need to enter is composed (OR-ed) + of a foreground and a background color. + + Foreground: + 0x00 = black, 0x08 = dark gray, + 0x01 = red, 0x09 = light red, + 0x02 = green, 0x0A = light green, + 0x03 = brown, 0x0B = yellow, + 0x04 = blue, 0x0C = light blue, + 0x05 = magenta, 0x0D = light magenta, + 0x06 = cyan, 0x0E = light cyan, + 0x07 = gray, 0x0F = white, + + (Foreground colors 0x08 to 0x0F do not work when a VGA + console font with 512 glyphs is used.) + + Background: + 0x00 = black, 0x40 = blue, + 0x10 = red, 0x50 = magenta, + 0x20 = green, 0x60 = cyan, + 0x30 = brown, 0x70 = gray, + + For example, 0x1F would yield white on red. + + If unsure, say N. + +config VT_PRINTK_EMERG_COLOR + hex "Emergency messages color" + range 0x00 0xFF + depends on VT_CKO + default 0x07 + ---help--- + This option defines with which color kernel emergency messages will + be printed to the console. + +config VT_PRINTK_ALERT_COLOR + hex "Alert messages color" + range 0x00 0xFF + depends on VT_CKO + default 0x07 + ---help--- + This option defines with which color kernel alert messages will + be printed to the console. + +config VT_PRINTK_CRIT_COLOR + hex "Critical messages color" + range 0x00 0xFF + depends on VT_CKO + default 0x07 + ---help--- + This option defines with which color kernel critical messages will + be printed to the console. + +config VT_PRINTK_ERR_COLOR + hex "Error messages color" + range 0x00 0xFF + depends on VT_CKO + default 0x07 + ---help--- + This option defines with which color kernel error messages will + be printed to the console. + +config VT_PRINTK_WARNING_COLOR + hex "Warning messages color" + range 0x00 0xFF + depends on VT_CKO + default 0x07 + ---help--- + This option defines with which color kernel warning messages will + be printed to the console. + +config VT_PRINTK_NOTICE_COLOR + hex "Notice messages color" + range 0x00 0xFF + depends on VT_CKO + default 0x07 + ---help--- + This option defines with which color kernel notice messages will + be printed to the console. + +config VT_PRINTK_INFO_COLOR + hex "Information messages color" + range 0x00 0xFF + depends on VT_CKO + default 0x07 + ---help--- + This option defines with which color kernel information messages will + be printed to the console. + +config VT_PRINTK_DEBUG_COLOR + hex "Debug messages color" + range 0x00 0xFF + depends on VT_CKO + default 0x07 + ---help--- + This option defines with which color kernel debug messages will + be printed to the console. + config HW_CONSOLE bool depends on VT && !S390 && !UML diff -ruN linux-2.6.23.orig/drivers/char/vt.c linux-2.6.23/drivers/char/vt.c --- linux-2.6.23.orig/drivers/char/vt.c 2007-10-02 05:24:52.000000000 +0200 +++ linux-2.6.23/drivers/char/vt.c 2007-10-06 23:06:55.000000000 +0200 @@ -73,6 +73,7 @@ */
#include <linux/module.h> +#include <linux/moduleparam.h> #include <linux/types.h> #include <linux/sched.h> #include <linux/tty.h> @@ -2344,16 +2345,44 @@
#ifdef CONFIG_VT_CONSOLE
+#ifdef CONFIG_VT_CKO +static unsigned int printk_color[8] __read_mostly = { + CONFIG_VT_PRINTK_EMERG_COLOR, /* KERN_EMERG */ + CONFIG_VT_PRINTK_ALERT_COLOR, /* KERN_ALERT */ + CONFIG_VT_PRINTK_CRIT_COLOR, /* KERN_CRIT */ + CONFIG_VT_PRINTK_ERR_COLOR, /* KERN_ERR */ + CONFIG_VT_PRINTK_WARNING_COLOR, /* KERN_WARNING */ + CONFIG_VT_PRINTK_NOTICE_COLOR, /* KERN_NOTICE */ + CONFIG_VT_PRINTK_INFO_COLOR, /* KERN_INFO */ + CONFIG_VT_PRINTK_DEBUG_COLOR, /* KERN_DEBUG */ +}; +module_param_array(printk_color, uint, NULL, S_IRUGO | S_IWUSR); + +static inline void vc_set_color(struct vc_data *vc, unsigned char color) +{ + vc->vc_color = color_table[color & 0xF] | + (color_table[(color >> 4) & 0x7] << 4) | + (color & 0x80); + update_attr(vc); +} +#else +static unsigned int printk_color[8]; +static inline void vc_set_color(const struct vc_data *vc, unsigned char c) +{ +} +#endif + /* * Console on virtual terminal * * The console must be locked when we get here. */
-static void vt_console_print(struct console *co, const char *b, unsigned count) +static void vt_console_print(struct console *co, const char *b, unsigned count, + unsigned int loglevel) { struct vc_data *vc = vc_cons[fg_console].d; - unsigned char c; + unsigned char current_color, c; static unsigned long printing; const ushort *start; ushort cnt = 0; @@ -2385,11 +2414,19 @@
start = (ushort *)vc->vc_pos;
+ /* + * We always get a valid loglevel - <8> and "no level" is transformed + * to <4> in the typical kernel. + */ + current_color = printk_color[loglevel]; + vc_set_color(vc, current_color); + /* Contrived structure to try to emulate original need_wrap behaviour * Problems caused when we have need_wrap set on '\n' character */ while (count--) { c = *b++; if (c == 10 || c == 13 || c == 8 || vc->vc_need_wrap) { + vc_set_color(vc, vc->vc_def_color); if (cnt > 0) { if (CON_IS_VISIBLE(vc)) vc->vc_sw->con_putcs(vc, start, cnt, vc->vc_y, vc->vc_x); @@ -2402,6 +2439,7 @@ bs(vc); start = (ushort *)vc->vc_pos; myx = vc->vc_x; + vc_set_color(vc, current_color); continue; } if (c != 13) @@ -2409,6 +2447,7 @@ cr(vc); start = (ushort *)vc->vc_pos; myx = vc->vc_x; + vc_set_color(vc, current_color); if (c == 10 || c == 13) continue; } @@ -2430,6 +2469,7 @@ vc->vc_need_wrap = 1; } } + vc_set_color(vc, vc->vc_def_color); set_cursor(vc);
quit: diff -ruN linux-2.6.23.orig/drivers/net/netconsole.c linux-2.6.23/drivers/net/netconsole.c --- linux-2.6.23.orig/drivers/net/netconsole.c 2007-10-02 05:24:52.000000000 +0200 +++ linux-2.6.23/drivers/net/netconsole.c 2007-10-06 23:00:39.000000000 +0200 @@ -65,7 +65,8 @@
#define MAX_PRINT_CHUNK 1000
-static void write_msg(struct console *con, const char *msg, unsigned int len) +static void write_msg(struct console *con, const char *msg, unsigned int len, + unsigned int loglevel) { int frag, left; unsigned long flags; diff -ruN linux-2.6.23.orig/drivers/serial/8250.c linux-2.6.23/drivers/serial/8250.c --- linux-2.6.23.orig/drivers/serial/8250.c 2007-10-02 05:24:52.000000000 +0200 +++ linux-2.6.23/drivers/serial/8250.c 2007-10-06 23:00:39.000000000 +0200 @@ -2464,7 +2464,8 @@ * The console_lock must be held when we get here. */ static void -serial8250_console_write(struct console *co, const char *s, unsigned int count) +serial8250_console_write(struct console *co, const char *s, unsigned int count, + unsigned int loglevel) { struct uart_8250_port *up = &serial8250_ports[co->index]; unsigned long flags; diff -ruN linux-2.6.23.orig/drivers/serial/8250_early.c linux-2.6.23/drivers/serial/8250_early.c --- linux-2.6.23.orig/drivers/serial/8250_early.c 2007-10-02 05:24:52.000000000 +0200 +++ linux-2.6.23/drivers/serial/8250_early.c 2007-10-06 23:00:39.000000000 +0200 @@ -82,7 +82,8 @@ serial_out(port, UART_TX, c); }
-static void __init early_serial8250_write(struct console *console, const char *s, unsigned int count) +static void __init early_serial8250_write(struct console *console, + const char *s, unsigned int count, unsigned int loglevel) { struct uart_port *port = &early_device.port; unsigned int ier; diff -ruN linux-2.6.23.orig/include/linux/console.h linux-2.6.23/include/linux/console.h --- linux-2.6.23.orig/include/linux/console.h 2007-10-02 05:24:52.000000000 +0200 +++ linux-2.6.23/include/linux/console.h 2007-10-06 23:00:39.000000000 +0200 @@ -93,7 +93,7 @@
struct console { char name[16]; - void (*write)(struct console *, const char *, unsigned); + void (*write)(struct console *, const char *, unsigned, unsigned int); int (*read)(struct console *, char *, unsigned); struct tty_driver *(*device)(struct console *, int *); void (*unblank)(void); diff -ruN linux-2.6.23.orig/kernel/printk.c linux-2.6.23/kernel/printk.c --- linux-2.6.23.orig/kernel/printk.c 2007-10-02 05:24:52.000000000 +0200 +++ linux-2.6.23/kernel/printk.c 2007-10-06 23:00:39.000000000 +0200 @@ -320,7 +320,8 @@ /* * Call the console drivers on a range of log_buf */ -static void __call_console_drivers(unsigned long start, unsigned long end) +static void __call_console_drivers(unsigned long start, unsigned long end, + unsigned int loglevel) { struct console *con;
@@ -328,7 +329,7 @@ if ((con->flags & CON_ENABLED) && con->write && (cpu_online(smp_processor_id()) || (con->flags & CON_ANYTIME))) - con->write(con, &LOG_BUF(start), end - start); + con->write(con, &LOG_BUF(start), end - start, loglevel); } }
@@ -355,10 +356,11 @@ if ((start & LOG_BUF_MASK) > (end & LOG_BUF_MASK)) { /* wrapped write */ __call_console_drivers(start & LOG_BUF_MASK, - log_buf_len); - __call_console_drivers(0, end & LOG_BUF_MASK); + log_buf_len, msg_log_level); + __call_console_drivers(0, end & LOG_BUF_MASK, + msg_log_level); } else { - __call_console_drivers(start, end); + __call_console_drivers(start, end, msg_log_level); } } } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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