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powerpc/ppc64: Do not turn AIL (reloc-on interrupts) too early 

Turn them on at the same time as we allow MSR_IR/DR in the paca
kernel MSR, ie, after the MMU has been setup enough to be able
to handle relocated access to the linear mapping.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
hifive-unleashed-5.1
Benjamin Herrenschmidt 2014-03-28 13:36:30 +11:00
parent a944a9c40b
commit 8f619b5429
2 changed files with 15 additions and 5 deletions
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2
arch/powerpc/kernel/cpu_setup_power.S
View File

@ -56,7 +56,6 @@ _GLOBAL(__setup_cpu_power8)
li r0,0
mtspr SPRN_LPID,r0
mfspr r3,SPRN_LPCR
oris r3, r3, LPCR_AIL_3@h
bl __init_LPCR
bl __init_HFSCR
bl __init_tlb_power8
@ -75,7 +74,6 @@ _GLOBAL(__restore_cpu_power8)
li r0,0
mtspr SPRN_LPID,r0
mfspr r3,SPRN_LPCR
oris r3, r3, LPCR_AIL_3@h
bl __init_LPCR
bl __init_HFSCR
bl __init_tlb_power8

18
arch/powerpc/kernel/setup_64.c
View File

@ -195,6 +195,18 @@ static void fixup_boot_paca(void)
get_paca()->data_offset = 0;
}
static void cpu_ready_for_interrupts(void)
{
/* Set IR and DR in PACA MSR */
get_paca()->kernel_msr = MSR_KERNEL;
/* Enable AIL if supported */
if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
unsigned long lpcr = mfspr(SPRN_LPCR);
mtspr(SPRN_LPCR, lpcr | LPCR_AIL_3);
}
}
/*
* Early initialization entry point. This is called by head.S
* with MMU translation disabled. We rely on the "feature" of
@ -264,9 +276,9 @@ void __init early_setup(unsigned long dt_ptr)
/*
* At this point, we can let interrupts switch to virtual mode
* (the MMU has been setup), so adjust the MSR in the PACA to
* have IR and DR set.
* have IR and DR set and enable AIL if it exists
*/
get_paca()->kernel_msr = MSR_KERNEL;
cpu_ready_for_interrupts();
/* Reserve large chunks of memory for use by CMA for KVM */
kvm_cma_reserve();
@ -307,7 +319,7 @@ void early_setup_secondary(void)
* (the MMU has been setup), so adjust the MSR in the PACA to
* have IR and DR set.
*/
get_paca()->kernel_msr = MSR_KERNEL;
cpu_ready_for_interrupts();
}
#endif /* CONFIG_SMP */