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powerpc: introduce pte_get_hash_gslot() helper

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Introduce pte_get_hash_gslot()() which returns the global slot number of
the HPTE in the global hash table.

This function will come in handy as we work towards re-arranging the PTE
bits in the later patches.

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ram Pai 2017-11-06 00:50:46 -08:00 committed by Michael Ellerman
parent 59aa31fd6f
commit 318995b4f5
2 changed files with 21 additions and 0 deletions
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3
arch/powerpc/include/asm/book3s/64/hash.h
View file

@ -167,6 +167,9 @@ static inline int hash__pte_none(pte_t pte)
return (pte_val(pte) & ~H_PTE_NONE_MASK) == 0;
}
unsigned long pte_get_hash_gslot(unsigned long vpn, unsigned long shift,
int ssize, real_pte_t rpte, unsigned int subpg_index);
/* This low level function performs the actual PTE insertion
* Setting the PTE depends on the MMU type and other factors. It's
* an horrible mess that I'm not going to try to clean up now but

18
arch/powerpc/mm/hash_utils_64.c
View file

@ -1592,6 +1592,24 @@ static inline void tm_flush_hash_page(int local)
}
#endif
/*
* Return the global hash slot, corresponding to the given PTE, which contains
* the HPTE.
*/
unsigned long pte_get_hash_gslot(unsigned long vpn, unsigned long shift,
int ssize, real_pte_t rpte, unsigned int subpg_index)
{
unsigned long hash, gslot, hidx;
hash = hpt_hash(vpn, shift, ssize);
hidx = __rpte_to_hidx(rpte, subpg_index);
if (hidx & _PTEIDX_SECONDARY)
hash = ~hash;
gslot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
gslot += hidx & _PTEIDX_GROUP_IX;
return gslot;
}
/* WARNING: This is called from hash_low_64.S, if you change this prototype,
* do not forget to update the assembly call site !
*/