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xen: add some debug output for failed multicalls 

Multicalls are expected to never fail, and the normal response to a
failed multicall is very terse.  In the interests of better
debuggability, add some more verbose output.  It may be worth turning
this off once it all seems more tested.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
This commit is contained in:
Jeremy Fitzhardinge 2007-10-16 11:51:31 -07:00 committed by Jeremy Fitzhardinge
parent e3d2697669
commit a122d6230e
1 changed files with 25 additions and 0 deletions
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25
arch/x86/xen/multicalls.c
View File

@ -26,11 +26,16 @@
#include "multicalls.h"
#define MC_DEBUG 1
#define MC_BATCH 32
#define MC_ARGS (MC_BATCH * 16 / sizeof(u64))
struct mc_buffer {
struct multicall_entry entries[MC_BATCH];
#if MC_DEBUG
struct multicall_entry debug[MC_BATCH];
#endif
u64 args[MC_ARGS];
struct callback {
void (*fn)(void *);
@ -56,11 +61,31 @@ void xen_mc_flush(void)
local_irq_save(flags);
if (b->mcidx) {
#if MC_DEBUG
memcpy(b->debug, b->entries,
b->mcidx * sizeof(struct multicall_entry));
#endif
if (HYPERVISOR_multicall(b->entries, b->mcidx) != 0)
BUG();
for (i = 0; i < b->mcidx; i++)
if (b->entries[i].result < 0)
ret++;
#if MC_DEBUG
if (ret) {
printk(KERN_ERR "%d multicall(s) failed: cpu %d\n",
ret, smp_processor_id());
for(i = 0; i < b->mcidx; i++) {
printk(" call %2d/%d: op=%lu arg=[%lx] result=%ld\n",
i+1, b->mcidx,
b->debug[i].op,
b->debug[i].args[0],
b->entries[i].result);
}
}
#endif
b->mcidx = 0;
b->argidx = 0;
} else