From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kirill Tkhai Date: Tue, 05 Oct 2010 19:57:56 +0000 Subject: [PATCH]SPARC v9: __tsb_context_switch - demap old tsb_map_vaddr Message-Id: <1286308676.11216.4.camel@hp> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: sparclinux@vger.kernel.org SPARC v9: __tsb_context_switch - demap old tsb_map_vaddr --- When TSB context switches in the function switch_mm() the following situation could occur. We have old mapping between physical address and tsb_map_vaddr in uTLB, and new mapping is written in fDTLB. Because uDTLB has more priority than fDTLB, all transformations occur through it, and TSB Pointer in tl0_damiss will be formed with the wrong physical address. To prevent this, we need to flush old tsb_map_vaddr (TSB_BASE) in TLB. Kernel version 2.6.35.7. Signed-off-by: Tkhai Kirill --- --- arch/sparc/kernel/tsb.S.orig 2010-10-05 19:46:55.272218523 +0400 +++ arch/sparc/kernel/tsb.S 2010-10-05 19:48:56.136235329 +0400 @@ -396,6 +396,9 @@ __tsb_context_switch: 2: ldx [%o1 + TSB_CONFIG_MAP_VADDR], %o4 brz %o4, 9f + or %o4, 1 << 5, %o5 + stxa %g0, [%o5] ASI_DMMU_DEMAP + membar #Sync ldx [%o1 + TSB_CONFIG_MAP_PTE], %o5 sethi %hi(sparc64_highest_unlocked_tlb_ent), %g2