diff options
| author | Ralf Baechle <ralf@linux-mips.org> | 2013-06-20 12:56:17 (GMT) |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2013-06-21 16:07:03 (GMT) |
| commit | 73acc7df534ff458a81435178dab3ea037ed6d78 (patch) | |
| tree | 7e6f7c7af7ccbeb81224eb88bc17d498fa529290 /arch/mips | |
| parent | b90b3802624e1f2a509f3e9f39775d94ec4762d7 (diff) | |
| download | linux-73acc7df534ff458a81435178dab3ea037ed6d78.tar.xz | |
MIPS: Fix TLBR-use hazards for R2 cores in the TLB reload handlers
MIPS R2 documents state that an execution hazard barrier is needed
after a TLBR before reading EntryLo.
Original patch by Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/5526/
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/mm/tlbex.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index afeef93..f0f4dc4 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -1935,6 +1935,19 @@ static void __cpuinit build_r4000_tlb_load_handler(void) uasm_i_nop(&p); uasm_i_tlbr(&p); + + switch (current_cpu_type()) { + default: + if (cpu_has_mips_r2) { + uasm_i_ehb(&p); + + case CPU_CAVIUM_OCTEON: + case CPU_CAVIUM_OCTEON_PLUS: + case CPU_CAVIUM_OCTEON2: + break; + } + } + /* Examine entrylo 0 or 1 based on ptr. */ if (use_bbit_insns()) { uasm_i_bbit0(&p, wr.r2, ilog2(sizeof(pte_t)), 8); @@ -1989,6 +2002,19 @@ static void __cpuinit build_r4000_tlb_load_handler(void) uasm_i_nop(&p); uasm_i_tlbr(&p); + + switch (current_cpu_type()) { + default: + if (cpu_has_mips_r2) { + uasm_i_ehb(&p); + + case CPU_CAVIUM_OCTEON: + case CPU_CAVIUM_OCTEON_PLUS: + case CPU_CAVIUM_OCTEON2: + break; + } + } + /* Examine entrylo 0 or 1 based on ptr. */ if (use_bbit_insns()) { uasm_i_bbit0(&p, wr.r2, ilog2(sizeof(pte_t)), 8); |