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powerpc/xics: Harden xics hypervisor backend 

During kdump stress testing I sometimes see the kdump kernel panic
with:

  Interrupt 0x306 (real) is invalid, disabling it.
  Kernel panic - not syncing: bad return code EOI - rc = -4, value=ff000306

Instead of panicing print the error message, dump the stack the first
time it happens and continue on. Add some more information to the
debug messages as well.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard 2011-11-24 19:39:36 +00:00 committed by Benjamin Herrenschmidt
parent 3bfd0c9c8f
commit 3ce21cdfe9
1 changed files with 27 additions and 11 deletions
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38
arch/powerpc/sysdev/xics/icp-hv.c
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@ -27,33 +27,49 @@ static inline unsigned int icp_hv_get_xirr(unsigned char cppr)
{
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
long rc;
unsigned int ret = XICS_IRQ_SPURIOUS;
rc = plpar_hcall(H_XIRR, retbuf, cppr);
if (rc != H_SUCCESS)
panic(" bad return code xirr - rc = %lx\n", rc);
return (unsigned int)retbuf[0];
if (rc == H_SUCCESS) {
ret = (unsigned int)retbuf[0];
} else {
pr_err("%s: bad return code xirr cppr=0x%x returned %ld\n",
__func__, cppr, rc);
WARN_ON_ONCE(1);
}
return ret;
}
static inline void icp_hv_set_xirr(unsigned int value)
{
long rc = plpar_hcall_norets(H_EOI, value);
if (rc != H_SUCCESS)
panic("bad return code EOI - rc = %ld, value=%x\n", rc, value);
if (rc != H_SUCCESS) {
pr_err("%s: bad return code eoi xirr=0x%x returned %ld\n",
__func__, value, rc);
WARN_ON_ONCE(1);
}
}
static inline void icp_hv_set_cppr(u8 value)
{
long rc = plpar_hcall_norets(H_CPPR, value);
if (rc != H_SUCCESS)
panic("bad return code cppr - rc = %lx\n", rc);
if (rc != H_SUCCESS) {
pr_err("%s: bad return code cppr cppr=0x%x returned %ld\n",
__func__, value, rc);
WARN_ON_ONCE(1);
}
}
static inline void icp_hv_set_qirr(int n_cpu , u8 value)
{
long rc = plpar_hcall_norets(H_IPI, get_hard_smp_processor_id(n_cpu),
value);
if (rc != H_SUCCESS)
panic("bad return code qirr - rc = %lx\n", rc);
int hw_cpu = get_hard_smp_processor_id(n_cpu);
long rc = plpar_hcall_norets(H_IPI, hw_cpu, value);
if (rc != H_SUCCESS) {
pr_err("%s: bad return code qirr cpu=%d hw_cpu=%d mfrr=0x%x "
"returned %ld\n", __func__, n_cpu, hw_cpu, value, rc);
WARN_ON_ONCE(1);
}
}
static void icp_hv_eoi(struct irq_data *d)