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Implement %pR to print struct resource content 

Add a %pR option to the kernel vsnprintf that prints the range of
addresses inside a struct resource passed by pointer.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Linus Torvalds 2008-10-20 15:07:34 +11:00
parent 88e366217e
commit 332d2e7834
1 changed files with 43 additions and 6 deletions
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49
lib/vsprintf.c
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@ -24,6 +24,7 @@
#include <linux/kernel.h>
#include <linux/kallsyms.h>
#include <linux/uaccess.h>
#include <linux/ioport.h>
#include <asm/page.h> /* for PAGE_SIZE */
#include <asm/div64.h>
@ -550,18 +551,51 @@ static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int
#endif
}
static char *resource_string(char *buf, char *end, struct resource *res, int field_width, int precision, int flags)
{
#ifndef IO_RSRC_PRINTK_SIZE
#define IO_RSRC_PRINTK_SIZE 4
#endif
#ifndef MEM_RSRC_PRINTK_SIZE
#define MEM_RSRC_PRINTK_SIZE 8
#endif
/* room for the actual numbers, the two "0x", -, [, ] and the final zero */
char sym[4*sizeof(resource_size_t) + 8];
char *p = sym, *pend = sym + sizeof(sym);
int size = -1;
if (res->flags & IORESOURCE_IO)
size = IO_RSRC_PRINTK_SIZE;
else if (res->flags & IORESOURCE_MEM)
size = MEM_RSRC_PRINTK_SIZE;
*p++ = '[';
p = number(p, pend, res->start, 16, size, -1, SPECIAL | SMALL | ZEROPAD);
*p++ = '-';
p = number(p, pend, res->end, 16, size, -1, SPECIAL | SMALL | ZEROPAD);
*p++ = ']';
*p = 0;
return string(buf, end, sym, field_width, precision, flags);
}
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed
* by an extra set of alphanumeric characters that are extended format
* specifiers.
*
* Right now we just handle 'F' (for symbolic Function descriptor pointers)
* and 'S' (for Symbolic direct pointers), but this can easily be
* extended in the future (network address types etc).
* Right now we handle:
*
* The difference between 'S' and 'F' is that on ia64 and ppc64 function
* pointers are really function descriptors, which contain a pointer the
* real address.
* - 'F' For symbolic function descriptor pointers
* - 'S' For symbolic direct pointers
* - 'R' For a struct resource pointer, it prints the range of
* addresses (not the name nor the flags)
*
* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
* function pointers are really function descriptors, which contain a
* pointer to the real address.
*/
static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags)
{
@ -571,6 +605,8 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field
/* Fallthrough */
case 'S':
return symbol_string(buf, end, ptr, field_width, precision, flags);
case 'R':
return resource_string(buf, end, ptr, field_width, precision, flags);
}
flags |= SMALL;
if (field_width == -1) {
@ -590,6 +626,7 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field
* This function follows C99 vsnprintf, but has some extensions:
* %pS output the name of a text symbol
* %pF output the name of a function pointer
* %pR output the address range in a struct resource
*
* The return value is the number of characters which would
* be generated for the given input, excluding the trailing