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powerpc/mm: Use H_READ with H_READ_4

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This will bulk read 4 hash pte slot entries and should reduce the loop

Signed-off-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:
Aneesh Kumar K.V
2015-12-01 09:06:59 +05:30
committed by Michael Ellerman
parent 45949ebe6c
commit 4ad90c8649
2 changed files with 44 additions and 27 deletions
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17
arch/powerpc/include/asm/plpar_wrappers.h
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@@ -201,6 +201,23 @@ static inline long plpar_pte_read_raw(unsigned long flags, unsigned long ptex,
return rc;
}
/*
* ptes must be 8*sizeof(unsigned long)
*/
static inline long plpar_pte_read_4(unsigned long flags, unsigned long ptex,
unsigned long *ptes)
{
long rc;
unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
rc = plpar_hcall9(H_READ, retbuf, flags | H_READ_4, ptex);
memcpy(ptes, retbuf, 8*sizeof(unsigned long));
return rc;
}
/*
* plpar_pte_read_4_raw can be called in real mode.
* ptes must be 8*sizeof(unsigned long)