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Commit 318995b4 authored by Ram Pai's avatar Ram Pai Committed by Michael Ellerman
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powerpc: introduce pte_get_hash_gslot() helper 



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: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarRam Pai <linuxram@us.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 59aa31fd

arch/powerpc/include/asm/book3s/64/hash.h

+3 −0
Original line number Diff line number Diff line
@@ -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

arch/powerpc/mm/hash_utils_64.c

+18 −0
Original line number Diff line number Diff line
@@ -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 !

 */