powerpc/xmon: Paged output for paca display

The paca display is already more than 24 lines, which can be problematic
if you have an old school 80x24 terminal, or more likely you are on a
virtual terminal which does not scroll for whatever reason.

This patch adds a new command "#", which takes a single (hex) numeric
argument: lines per page. It will cause the output of "dp" and "dpa"
to be broken into pages, if necessary.

Sample output:

0:mon> # 10
0:mon> dp1
paca for cpu 0x1 @ c00000000fdc0480:
 possible         = yes
 present          = yes
 online           = yes
 lock_token       = 0x8000            	(0x8)
 paca_index       = 0x1               	(0xa)
 kernel_toc       = 0xc000000000eb2400	(0x10)
 kernelbase       = 0xc000000000000000	(0x18)
 kernel_msr       = 0xb000000000001032	(0x20)
 emergency_sp     = 0xc00000003ffe8000	(0x28)
 mc_emergency_sp  = 0xc00000003ffe4000	(0x2e0)
 in_mce           = 0x0               	(0x2e8)
 data_offset      = 0x7f170000        	(0x30)
 hw_cpu_id        = 0x8               	(0x38)
 cpu_start        = 0x1               	(0x3a)
 kexec_state      = 0x0               	(0x3b)
[Hit a key (a:all, q:truncate, any:next page)]
0:mon>
 __current        = 0xc00000007e696620	(0x290)
 kstack           = 0xc00000007e6ebe30	(0x298)
 stab_rr          = 0xb               	(0x2a0)
 saved_r1         = 0xc00000007ef37860	(0x2a8)
 trap_save        = 0x0               	(0x2b8)
 soft_enabled     = 0x0               	(0x2ba)
 irq_happened     = 0x1               	(0x2bb)
 io_sync          = 0x0               	(0x2bc)
 irq_work_pending = 0x0               	(0x2bd)
 nap_state_lost   = 0x0               	(0x2be)
0:mon>

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
[mpe: Use bool, make some variables static]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sam bobroff 2015-10-08 11:50:23 +11:00 committed by Michael Ellerman
parent b340587e68
commit 958b7c8050
3 changed files with 83 additions and 2 deletions

View File

@ -11,10 +11,25 @@
#include <asm/time.h>
#include "nonstdio.h"
static bool paginating, paginate_skipping;
static unsigned long paginate_lpp; /* Lines Per Page */
static unsigned long paginate_pos;
static int xmon_write(const void *ptr, int nb)
void xmon_start_pagination(void)
{
return udbg_write(ptr, nb);
paginating = true;
paginate_skipping = false;
paginate_pos = 0;
}
void xmon_end_pagination(void)
{
paginating = false;
}
void xmon_set_pagination_lpp(unsigned long lpp)
{
paginate_lpp = lpp;
}
static int xmon_readchar(void)
@ -24,6 +39,51 @@ static int xmon_readchar(void)
return -1;
}
static int xmon_write(const char *ptr, int nb)
{
int rv = 0;
const char *p = ptr, *q;
const char msg[] = "[Hit a key (a:all, q:truncate, any:next page)]";
if (nb <= 0)
return rv;
if (paginating && paginate_skipping)
return nb;
if (paginate_lpp) {
while (paginating && (q = strchr(p, '\n'))) {
rv += udbg_write(p, q - p + 1);
p = q + 1;
paginate_pos++;
if (paginate_pos >= paginate_lpp) {
udbg_write(msg, strlen(msg));
switch (xmon_readchar()) {
case 'a':
paginating = false;
break;
case 'q':
paginate_skipping = true;
break;
default:
/* nothing */
break;
}
paginate_pos = 0;
udbg_write("\r\n", 2);
if (paginate_skipping)
return nb;
}
}
}
return rv + udbg_write(p, nb - (p - ptr));
}
int xmon_putchar(int c)
{
char ch = c;

View File

@ -3,6 +3,9 @@
#define printf xmon_printf
#define putchar xmon_putchar
extern void xmon_set_pagination_lpp(unsigned long lpp);
extern void xmon_start_pagination(void);
extern void xmon_end_pagination(void);
extern int xmon_putchar(int c);
extern void xmon_puts(const char *);
extern char *xmon_gets(char *, int);

View File

@ -242,6 +242,9 @@ Commands:\n\
" u dump TLB\n"
#endif
" ? help\n"
#ifdef CONFIG_PPC64
" # n limit output to n lines per page (dump paca only)\n"
#endif
" zr reboot\n\
zh halt\n"
;
@ -833,6 +836,16 @@ static void remove_cpu_bpts(void)
write_ciabr(0);
}
static void set_lpp_cmd(void)
{
unsigned long lpp;
if (!scanhex(&lpp)) {
printf("Invalid number.\n");
lpp = 0;
}
xmon_set_pagination_lpp(lpp);
}
/* Command interpreting routine */
static char *last_cmd;
@ -924,6 +937,9 @@ cmds(struct pt_regs *excp)
case '?':
xmon_puts(help_string);
break;
case '#':
set_lpp_cmd();
break;
case 'b':
bpt_cmds();
break;
@ -2166,7 +2182,9 @@ dump(void)
#ifdef CONFIG_PPC64
if (c == 'p') {
xmon_start_pagination();
dump_pacas();
xmon_end_pagination();
return;
}
#endif