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powerpc/powernv: Fix local TLB flush for boot and MCE on POWER9

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There are two cases outside the normal address space management
where a CPU's local TLB is to be flushed:

  1. Host boot; in case something has left stale entries in the
     TLB (e.g., kexec).

  2. Machine check; to clean corrupted TLB entries.

CPU state restore from deep idle states also flushes the TLB.
However this seems to be a side effect of reusing the boot code to set
CPU state, rather than a requirement itself.

The current flushing has a number of problems with ISA v3.0B:

- The current radix mode of the MMU is not taken into account. tlbiel
  is undefined if the R field does not match the current radix mode.

- ISA v3.0B hash must flush the partition and process table caches.

- ISA v3.0B radix must flush partition and process scoped translations,
  partition and process table caches, and also the page walk cache.

Add POWER9 cases to handle these, with radix vs hash determined by the
host MMU mode.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin
2017-07-06 20:51:28 +10:00
committed by Michael Ellerman
parent 3a6a04706f
commit 41d0c2ecde
3 changed files with 67 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
arch/powerpc/kernel/dt_cpu_ftrs.c
View File

@@ -94,9 +94,6 @@ static void (*init_pmu_registers)(void);
static void cpufeatures_flush_tlb(void)
{
unsigned long rb;
unsigned int i, num_sets;
/*
* This is a temporary measure to keep equivalent TLB flush as the
* cputable based setup code.
@@ -105,24 +102,15 @@ static void cpufeatures_flush_tlb(void)
case PVR_POWER8:
case PVR_POWER8E:
case PVR_POWER8NVL:
num_sets = POWER8_TLB_SETS;
__flush_tlb_power8(POWER8_TLB_SETS);
break;
case PVR_POWER9:
num_sets = POWER9_TLB_SETS_HASH;
__flush_tlb_power9(POWER9_TLB_SETS_HASH);
break;
default:
num_sets = 1;
pr_err("unknown CPU version for boot TLB flush\n");
break;
}
asm volatile("ptesync" : : : "memory");
rb = TLBIEL_INVAL_SET;
for (i = 0; i < num_sets; i++) {
asm volatile("tlbiel %0" : : "r" (rb));
rb += 1 << TLBIEL_INVAL_SET_SHIFT;
}
asm volatile("ptesync" : : : "memory");
}
static void __restore_cpu_cpufeatures(void)