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powerpc/mm: Wire up hpte_removebolted for powernv

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Adds support for removing bolted (i.e kernel linear mapping) mappings on
powernv. This is needed to support memory hot unplug operations which
are required for the teardown of DAX/PMEM devices.

Reviewed-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Rashmica Gupta <rashmica.g@gmail.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Anton Blanchard 2017-06-28 11:32:35 +10:00 committed by Michael Ellerman
parent ebd3119793
commit 1b644f57b3
1 changed files with 33 additions and 0 deletions
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33
arch/powerpc/mm/hash_native_64.c
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@ -413,6 +413,38 @@ static void native_hpte_updateboltedpp(unsigned long newpp, unsigned long ea,
tlbie(vpn, psize, psize, ssize, 0);
}
/*
* Remove a bolted kernel entry. Memory hotplug uses this.
*
* No need to lock here because we should be the only user.
*/
static int native_hpte_removebolted(unsigned long ea, int psize, int ssize)
{
unsigned long vpn;
unsigned long vsid;
long slot;
struct hash_pte *hptep;
vsid = get_kernel_vsid(ea, ssize);
vpn = hpt_vpn(ea, vsid, ssize);
slot = native_hpte_find(vpn, psize, ssize);
if (slot == -1)
return -ENOENT;
hptep = htab_address + slot;
VM_WARN_ON(!(be64_to_cpu(hptep->v) & HPTE_V_BOLTED));
/* Invalidate the hpte */
hptep->v = 0;
/* Invalidate the TLB */
tlbie(vpn, psize, psize, ssize, 0);
return 0;
}
static void native_hpte_invalidate(unsigned long slot, unsigned long vpn,
int bpsize, int apsize, int ssize, int local)
{
@ -731,6 +763,7 @@ void __init hpte_init_native(void)
mmu_hash_ops.hpte_invalidate = native_hpte_invalidate;
mmu_hash_ops.hpte_updatepp = native_hpte_updatepp;
mmu_hash_ops.hpte_updateboltedpp = native_hpte_updateboltedpp;
mmu_hash_ops.hpte_removebolted = native_hpte_removebolted;
mmu_hash_ops.hpte_insert = native_hpte_insert;
mmu_hash_ops.hpte_remove = native_hpte_remove;
mmu_hash_ops.hpte_clear_all = native_hpte_clear;