diff options
author | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-06 14:11:21 -0400 |
---|---|---|
committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-12 14:46:18 -0400 |
commit | bda0f5bad812df076a28fa5e58d86dfe68415251 (patch) | |
tree | 221517adf66b504282e484d9d2faaee4efe3602d /arch/tile/kernel | |
parent | 7c29b78a0e0c7df6e0ba0092fee334ddc3086f16 (diff) | |
download | linux-bda0f5bad812df076a28fa5e58d86dfe68415251.tar.bz2 |
tile: various console improvements
This change improves and cleans up the tile console.
- We enable HVC_IRQ support on tilegx, with the addition of a new
Tilera hypervisor API for tilegx to allow a console IPI. If IPI
support is not available we fall back to the previous polling mode.
- We simplify the earlyprintk code to use CON_BOOT and eliminate some
of the other supporting earlyprintk code.
- A new tile_console_write() primitive is used to send output to
the console and is factored out of the hvc_tile driver.
This lets us support a "sim_console" boot argument to allow using
simulator hooks to send output to the "console" as a slightly
faster alternative to emulating the hardware more directly.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/tile/kernel')
-rw-r--r-- | arch/tile/kernel/early_printk.c | 47 | ||||
-rw-r--r-- | arch/tile/kernel/hvglue.lds | 3 | ||||
-rw-r--r-- | arch/tile/kernel/reboot.c | 2 |
3 files changed, 13 insertions, 39 deletions
diff --git a/arch/tile/kernel/early_printk.c b/arch/tile/kernel/early_printk.c index 34d72a151bf3..b608e00e7f6d 100644 --- a/arch/tile/kernel/early_printk.c +++ b/arch/tile/kernel/early_printk.c @@ -23,19 +23,24 @@ static void early_hv_write(struct console *con, const char *s, unsigned n) { - hv_console_write((HV_VirtAddr) s, n); + tile_console_write(s, n); + + /* + * Convert NL to NLCR (close enough to CRNL) during early boot. + * We assume newlines are at the ends of strings, which turns out + * to be good enough for early boot console output. + */ + if (n && s[n-1] == '\n') + tile_console_write("\r", 1); } static struct console early_hv_console = { .name = "earlyhv", .write = early_hv_write, - .flags = CON_PRINTBUFFER, + .flags = CON_PRINTBUFFER | CON_BOOT, .index = -1, }; -/* Direct interface for emergencies */ -static int early_console_complete; - void early_panic(const char *fmt, ...) { va_list ap; @@ -43,51 +48,21 @@ void early_panic(const char *fmt, ...) va_start(ap, fmt); early_printk("Kernel panic - not syncing: "); early_vprintk(fmt, ap); - early_console->write(early_console, "\n", 1); + early_printk("\n"); va_end(ap); dump_stack(); hv_halt(); } -static int __initdata keep_early; - static int __init setup_early_printk(char *str) { if (early_console) return 1; - if (str != NULL && strncmp(str, "keep", 4) == 0) - keep_early = 1; - early_console = &early_hv_console; register_console(early_console); return 0; } -void __init disable_early_printk(void) -{ - early_console_complete = 1; - if (!early_console) - return; - if (!keep_early) { - early_printk("disabling early console\n"); - unregister_console(early_console); - early_console = NULL; - } else { - early_printk("keeping early console\n"); - } -} - -void warn_early_printk(void) -{ - if (early_console_complete || early_console) - return; - early_printk("\ -Machine shutting down before console output is fully initialized.\n\ -You may wish to reboot and add the option 'earlyprintk' to your\n\ -boot command line to see any diagnostic early console output.\n\ -"); -} - early_param("earlyprintk", setup_early_printk); diff --git a/arch/tile/kernel/hvglue.lds b/arch/tile/kernel/hvglue.lds index d44c5a67a1ed..ef522900633a 100644 --- a/arch/tile/kernel/hvglue.lds +++ b/arch/tile/kernel/hvglue.lds @@ -56,4 +56,5 @@ hv_inquire_realpa = TEXT_OFFSET + 0x106c0; hv_flush_all = TEXT_OFFSET + 0x106e0; hv_get_ipi_pte = TEXT_OFFSET + 0x10700; hv_set_pte_super_shift = TEXT_OFFSET + 0x10720; -hv_glue_internals = TEXT_OFFSET + 0x10740; +hv_console_set_ipi = TEXT_OFFSET + 0x107e0; +hv_glue_internals = TEXT_OFFSET + 0x10800; diff --git a/arch/tile/kernel/reboot.c b/arch/tile/kernel/reboot.c index d1b5c913ae72..6c5d2c070a12 100644 --- a/arch/tile/kernel/reboot.c +++ b/arch/tile/kernel/reboot.c @@ -27,7 +27,6 @@ void machine_halt(void) { - warn_early_printk(); arch_local_irq_disable_all(); smp_send_stop(); hv_halt(); @@ -35,7 +34,6 @@ void machine_halt(void) void machine_power_off(void) { - warn_early_printk(); arch_local_irq_disable_all(); smp_send_stop(); hv_power_off(); |