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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2014-11-02 18:45:28 +0300 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-12-02 06:10:11 +0300 |
| commit | d557b09800dab5dd6804e5b79324069abcf0be11 (patch) | |
| tree | cb28d3966042edb834d23341d9f98bdf95c1646c /arch/powerpc/mm/hash_utils_64.c | |
| parent | f1581bf14bc40b4a14bf10358eac0b22173b3313 (diff) | |
| download | linux-d557b09800dab5dd6804e5b79324069abcf0be11.tar.xz | |
powerpc/mm/thp: Use tlbiel if possible
If we know that user address space has never executed on other cpus
we could use tlbiel.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/hash_utils_64.c')
| -rw-r--r-- | arch/powerpc/mm/hash_utils_64.c | 28 |
1 files changed, 23 insertions, 5 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 6c2076c65d7c..68211d398fdb 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -1317,7 +1317,7 @@ void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize, int ssize, #ifdef CONFIG_TRANSPARENT_HUGEPAGE void flush_hash_hugepage(unsigned long vsid, unsigned long addr, - pmd_t *pmdp, unsigned int psize, int ssize) + pmd_t *pmdp, unsigned int psize, int ssize, int local) { int i, max_hpte_count, valid; unsigned long s_addr; @@ -1334,9 +1334,11 @@ void flush_hash_hugepage(unsigned long vsid, unsigned long addr, if (!hpte_slot_array) return; - if (ppc_md.hugepage_invalidate) - return ppc_md.hugepage_invalidate(vsid, s_addr, hpte_slot_array, - psize, ssize); + if (ppc_md.hugepage_invalidate) { + ppc_md.hugepage_invalidate(vsid, s_addr, hpte_slot_array, + psize, ssize, local); + goto tm_abort; + } /* * No bluk hpte removal support, invalidate each entry */ @@ -1362,8 +1364,24 @@ void flush_hash_hugepage(unsigned long vsid, unsigned long addr, slot = (hash & htab_hash_mask) * HPTES_PER_GROUP; slot += hidx & _PTEIDX_GROUP_IX; ppc_md.hpte_invalidate(slot, vpn, psize, - MMU_PAGE_16M, ssize, 0); + MMU_PAGE_16M, ssize, local); + } +tm_abort: +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + /* Transactions are not aborted by tlbiel, only tlbie. + * Without, syncing a page back to a block device w/ PIO could pick up + * transactional data (bad!) so we force an abort here. Before the + * sync the page will be made read-only, which will flush_hash_page. + * BIG ISSUE here: if the kernel uses a page from userspace without + * unmapping it first, it may see the speculated version. + */ + if (local && cpu_has_feature(CPU_FTR_TM) && + current->thread.regs && + MSR_TM_ACTIVE(current->thread.regs->msr)) { + tm_enable(); + tm_abort(TM_CAUSE_TLBI); } +#endif } #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |