Commit 01c593d7 authored by Scott Wood's avatar Scott Wood

powerpc/fsl-booke-64: Allow booting from the secondary thread

This allows SMP kernels to work as kdump crash kernels.  While crash
kernels don't really need to be SMP, this prevents things from breaking
if a user does it anyway (which is not something you want to only find
out once the main kernel has crashed in the field, especially if
whether it works or not depends on which cpu crashed).
Signed-off-by: default avatarScott Wood <scottwood@freescale.com>
parent 52246445
......@@ -173,15 +173,22 @@ static inline u32 read_spin_table_addr_l(void *spin_table)
static void wake_hw_thread(void *info)
{
void fsl_secondary_thread_init(void);
unsigned long imsr1, inia1;
unsigned long imsr, inia;
int nr = *(const int *)info;
imsr1 = MSR_KERNEL;
inia1 = *(unsigned long *)fsl_secondary_thread_init;
mttmr(TMRN_IMSR1, imsr1);
mttmr(TMRN_INIA1, inia1);
imsr = MSR_KERNEL;
inia = *(unsigned long *)fsl_secondary_thread_init;
if (cpu_thread_in_core(nr) == 0) {
/* For when we boot on a secondary thread with kdump */
mttmr(TMRN_IMSR0, imsr);
mttmr(TMRN_INIA0, inia);
mtspr(SPRN_TENS, TEN_THREAD(0));
} else {
mttmr(TMRN_IMSR1, imsr);
mttmr(TMRN_INIA1, inia);
mtspr(SPRN_TENS, TEN_THREAD(1));
}
smp_generic_kick_cpu(nr);
}
......@@ -224,6 +231,12 @@ static int smp_85xx_kick_cpu(int nr)
smp_call_function_single(primary, wake_hw_thread, &nr, 0);
return 0;
} else if (cpu_thread_in_core(boot_cpuid) != 0 &&
cpu_first_thread_sibling(boot_cpuid) == nr) {
if (WARN_ON_ONCE(!cpu_has_feature(CPU_FTR_SMT)))
return -ENOENT;
smp_call_function_single(boot_cpuid, wake_hw_thread, &nr, 0);
}
#endif
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment