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xen/x86: add diagnostic printout to xen_mc_flush() in case of error

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Failure of an element of a Xen multicall is signalled via a WARN()
only if the kernel is compiled with MC_DEBUG. It is impossible to
know which element failed and why it did so.

Change that by printing the related information even without MC_DEBUG,
even if maybe in some limited form (e.g. without information which
caller produced the failing element).

Move the printing out of the switch statement in order to have the
same information for a single call.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2018-11-23 17:24:51 +01:00
parent f2a5fef124
commit a7b403104e
1 changed files with 20 additions and 15 deletions
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35
arch/x86/xen/multicalls.c
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@ -69,6 +69,11 @@ void xen_mc_flush(void)
trace_xen_mc_flush(b->mcidx, b->argidx, b->cbidx);
#if MC_DEBUG
memcpy(b->debug, b->entries,
b->mcidx * sizeof(struct multicall_entry));
#endif
switch (b->mcidx) {
case 0:
/* no-op */
@ -87,32 +92,34 @@ void xen_mc_flush(void)
break;
default:
#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 (WARN_ON(ret)) {
pr_err("%d of %d multicall(s) failed: cpu %d\n",
ret, b->mcidx, smp_processor_id());
for (i = 0; i < b->mcidx; i++) {
if (b->entries[i].result < 0) {
#if MC_DEBUG
if (ret) {
printk(KERN_ERR "%d multicall(s) failed: cpu %d\n",
ret, smp_processor_id());
dump_stack();
for (i = 0; i < b->mcidx; i++) {
printk(KERN_DEBUG " call %2d/%d: op=%lu arg=[%lx] result=%ld\t%pF\n",
i+1, b->mcidx,
pr_err(" call %2d: op=%lu arg=[%lx] result=%ld\t%pF\n",
i + 1,
b->debug[i].op,
b->debug[i].args[0],
b->entries[i].result,
b->caller[i]);
#else
pr_err(" call %2d: op=%lu arg=[%lx] result=%ld\n",
i + 1,
b->entries[i].op,
b->entries[i].args[0],
b->entries[i].result);
#endif
}
}
#endif
}
b->mcidx = 0;
@ -126,8 +133,6 @@ void xen_mc_flush(void)
b->cbidx = 0;
local_irq_restore(flags);
WARN_ON(ret);
}
struct multicall_space __xen_mc_entry(size_t args)