diff options
author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2015-12-01 09:06:59 +0530 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-12-14 15:19:17 +1100 |
commit | 4ad90c864989337e7946f456478b6417325689d0 (patch) | |
tree | 468b25b8e496092ad8f32db383455f8f9261fbca /arch/powerpc/platforms | |
parent | 45949ebe6c748cba93c1dd6ab9d03190f862ecf7 (diff) |
powerpc/mm: Use H_READ with H_READ_4
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>
Diffstat (limited to 'arch/powerpc/platforms')
-rw-r--r-- | arch/powerpc/platforms/pseries/lpar.c | 54 |
1 files changed, 27 insertions, 27 deletions
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c index 6d46547871aa..477290ad855e 100644 --- a/arch/powerpc/platforms/pseries/lpar.c +++ b/arch/powerpc/platforms/pseries/lpar.c @@ -315,48 +315,48 @@ static long pSeries_lpar_hpte_updatepp(unsigned long slot, return 0; } -static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot) +static long __pSeries_lpar_hpte_find(unsigned long want_v, unsigned long hpte_group) { - unsigned long dword0; - unsigned long lpar_rc; - unsigned long dummy_word1; - unsigned long flags; + long lpar_rc; + unsigned long i, j; + struct { + unsigned long pteh; + unsigned long ptel; + } ptes[4]; - /* Read 1 pte at a time */ - /* Do not need RPN to logical page translation */ - /* No cross CEC PFT access */ - flags = 0; + for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) { - lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1); + lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes); + if (lpar_rc != H_SUCCESS) + continue; - BUG_ON(lpar_rc != H_SUCCESS); + for (j = 0; j < 4; j++) { + if (HPTE_V_COMPARE(ptes[j].pteh, want_v) && + (ptes[j].pteh & HPTE_V_VALID)) + return i + j; + } + } - return dword0; + return -1; } static long pSeries_lpar_hpte_find(unsigned long vpn, int psize, int ssize) { - unsigned long hash; - unsigned long i; long slot; - unsigned long want_v, hpte_v; + unsigned long hash; + unsigned long want_v; + unsigned long hpte_group; hash = hpt_hash(vpn, mmu_psize_defs[psize].shift, ssize); want_v = hpte_encode_avpn(vpn, psize, ssize); /* Bolted entries are always in the primary group */ - slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; - for (i = 0; i < HPTES_PER_GROUP; i++) { - hpte_v = pSeries_lpar_hpte_getword0(slot); - - if (HPTE_V_COMPARE(hpte_v, want_v) && (hpte_v & HPTE_V_VALID)) - /* HPTE matches */ - return slot; - ++slot; - } - - return -1; -} + hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP; + slot = __pSeries_lpar_hpte_find(want_v, hpte_group); + if (slot < 0) + return -1; + return hpte_group + slot; +} static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, unsigned long ea, |