Commit 3ce21cdf authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt

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: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 3bfd0c9c
...@@ -27,33 +27,49 @@ static inline unsigned int icp_hv_get_xirr(unsigned char cppr) ...@@ -27,33 +27,49 @@ static inline unsigned int icp_hv_get_xirr(unsigned char cppr)
{ {
unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
long rc; long rc;
unsigned int ret = XICS_IRQ_SPURIOUS;
rc = plpar_hcall(H_XIRR, retbuf, cppr); rc = plpar_hcall(H_XIRR, retbuf, cppr);
if (rc != H_SUCCESS) if (rc == H_SUCCESS) {
panic(" bad return code xirr - rc = %lx\n", rc); ret = (unsigned int)retbuf[0];
return (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) static inline void icp_hv_set_xirr(unsigned int value)
{ {
long rc = plpar_hcall_norets(H_EOI, value); long rc = plpar_hcall_norets(H_EOI, value);
if (rc != H_SUCCESS) if (rc != H_SUCCESS) {
panic("bad return code EOI - rc = %ld, value=%x\n", rc, value); 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) static inline void icp_hv_set_cppr(u8 value)
{ {
long rc = plpar_hcall_norets(H_CPPR, value); long rc = plpar_hcall_norets(H_CPPR, value);
if (rc != H_SUCCESS) if (rc != H_SUCCESS) {
panic("bad return code cppr - rc = %lx\n", rc); 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) 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), int hw_cpu = get_hard_smp_processor_id(n_cpu);
value); long rc = plpar_hcall_norets(H_IPI, hw_cpu, value);
if (rc != H_SUCCESS) if (rc != H_SUCCESS) {
panic("bad return code qirr - rc = %lx\n", rc); 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) static void icp_hv_eoi(struct irq_data *d)
......
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