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lib: Introduce sbi_dprintf() API 

This patch introduces new sbi_dprintf() API for runtime debug
prints. The sbi_dprintf() will print to console for a given
HART only when SBI_SCRATCH_DEBUG_PRINTS option in enabled in
sbi_scratch for this HART.

We can now add debug prints using sbi_dprintf() at important
places in OpenSBI sources. These debug prints will only show
up when previous booting stage or compile time parameter sets
the SBI_SCRATCH_DEBUG_PRINTS option in scratch space.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Anup Patel 2019-08-08 12:10:22 +05:30 committed by Anup Patel
parent b1318e578b
commit dbff3e9f12
3 changed files with 19 additions and 0 deletions
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4
include/sbi/sbi_console.h
View File

@ -31,6 +31,10 @@ int __printf(3, 4) sbi_snprintf(char *out, u32 out_sz, const char *format, ...);
int __printf(1, 2) sbi_printf(const char *format, ...); int __printf(1, 2) sbi_printf(const char *format, ...);
struct sbi_scratch; struct sbi_scratch;
int __printf(2, 3) sbi_dprintf(struct sbi_scratch *scratch,
const char *format, ...);
int sbi_console_init(struct sbi_scratch *scratch); int sbi_console_init(struct sbi_scratch *scratch);
#endif #endif

2
include/sbi/sbi_scratch.h
View File

@ -74,6 +74,8 @@ struct sbi_scratch {
enum sbi_scratch_options { enum sbi_scratch_options {
/** Disable prints during boot */ /** Disable prints during boot */
SBI_SCRATCH_NO_BOOT_PRINTS = (1 << 0), SBI_SCRATCH_NO_BOOT_PRINTS = (1 << 0),
/** Enable runtime debug prints */
SBI_SCRATCH_DEBUG_PRINTS = (1 << 1),
}; };
/** Get pointer to sbi_scratch for current HART */ /** Get pointer to sbi_scratch for current HART */

13
lib/sbi/sbi_console.c
View File

@ -375,6 +375,19 @@ int sbi_printf(const char *format, ...)
return retval; return retval;
} }
int sbi_dprintf(struct sbi_scratch *scratch, const char *format, ...)
{
va_list args;
int retval = 0;
va_start(args, format);
if (scratch->options & SBI_SCRATCH_DEBUG_PRINTS)
retval = print(NULL, NULL, format, args);
va_end(args);
return retval;
}
int sbi_console_init(struct sbi_scratch *scratch) int sbi_console_init(struct sbi_scratch *scratch)
{ {
console_plat = sbi_platform_ptr(scratch); console_plat = sbi_platform_ptr(scratch);