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| author |   Diana Craciun <diana.craciun@nxp.com> | 2018-07-28 09:06:37 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2018-08-08 00:32:24 +1000 |
| commit | ebcd1bfc33c7a90df941df68a6e5d4018c022fba (patch) | |
| tree | 55128a08e7c84290d2e187f7c79d66743c7cc5ea /arch/powerpc | |
| parent | powerpc/64: Make meltdown reporting Book3S 64 specific (diff) | |
| download | linux-dev-ebcd1bfc33c7a90df941df68a6e5d4018c022fba.tar.xz linux-dev-ebcd1bfc33c7a90df941df68a6e5d4018c022fba.zip | |
powerpc/fsl: Add barrier_nospec implementation for NXP PowerPC Book3E
Implement the barrier_nospec as a isync;sync instruction sequence.
The implementation uses the infrastructure built for BOOK3S 64.
Signed-off-by: Diana Craciun <diana.craciun@nxp.com>
[mpe: Split out of larger patch]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/Kconfig | 2 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/barrier.h | 8 | ||||
| -rw-r--r-- | arch/powerpc/lib/feature-fixups.c | 31 |
3 files changed, 39 insertions, 2 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 846c89ed7fa3..8b6cd6780d8f 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -245,7 +245,7 @@ config PPC config PPC_BARRIER_NOSPEC bool default y - depends on PPC_BOOK3S_64 + depends on PPC_BOOK3S_64 || PPC_FSL_BOOK3E config GENERIC_CSUM def_bool n diff --git a/arch/powerpc/include/asm/barrier.h b/arch/powerpc/include/asm/barrier.h index cdc6960506e2..fbe8df433019 100644 --- a/arch/powerpc/include/asm/barrier.h +++ b/arch/powerpc/include/asm/barrier.h @@ -78,12 +78,18 @@ do { \ ___p1; \ }) +#ifdef CONFIG_PPC_BOOK3S_64 +#define NOSPEC_BARRIER_SLOT nop +#elif defined(CONFIG_PPC_FSL_BOOK3E) +#define NOSPEC_BARRIER_SLOT nop; nop +#endif + #ifdef CONFIG_PPC_BARRIER_NOSPEC /* * Prevent execution of subsequent instructions until preceding branches have * been fully resolved and are no longer executing speculatively. */ -#define barrier_nospec_asm NOSPEC_BARRIER_FIXUP_SECTION; nop +#define barrier_nospec_asm NOSPEC_BARRIER_FIXUP_SECTION; NOSPEC_BARRIER_SLOT // This also acts as a compiler barrier due to the memory clobber. #define barrier_nospec() asm (stringify_in_c(barrier_nospec_asm) ::: "memory") diff --git a/arch/powerpc/lib/feature-fixups.c b/arch/powerpc/lib/feature-fixups.c index 0e604b41b5d1..e613b02bb2f0 100644 --- a/arch/powerpc/lib/feature-fixups.c +++ b/arch/powerpc/lib/feature-fixups.c @@ -318,6 +318,37 @@ void do_barrier_nospec_fixups(bool enable) } #endif /* CONFIG_PPC_BARRIER_NOSPEC */ +#ifdef CONFIG_PPC_FSL_BOOK3E +void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end) +{ + unsigned int instr[2], *dest; + long *start, *end; + int i; + + start = fixup_start; + end = fixup_end; + + instr[0] = PPC_INST_NOP; + instr[1] = PPC_INST_NOP; + + if (enable) { + pr_info("barrier-nospec: using isync; sync as speculation barrier\n"); + instr[0] = PPC_INST_ISYNC; + instr[1] = PPC_INST_SYNC; + } + + for (i = 0; start < end; start++, i++) { + dest = (void *)start + *start; + + pr_devel("patching dest %lx\n", (unsigned long)dest); + patch_instruction(dest, instr[0]); + patch_instruction(dest + 1, instr[1]); + } + + printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i); +} +#endif /* CONFIG_PPC_FSL_BOOK3E */ + void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end) { long *start, *end; |