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| author | Masato Noguchi <Masato.Noguchi@jp.sony.com> | 2006-11-20 18:45:04 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-12-04 20:39:55 +1100 |
| commit | 2ebb2477f9a61b436dd22b75189857df1a77e585 (patch) | |
| tree | d0f9fbfd2f63c83adcf71ab316096d25c5f50433 /arch/powerpc | |
| parent | 453d9f72a91d798c3e3c4b4bed26210926dfb57b (diff) | |
| download | linux-2ebb2477f9a61b436dd22b75189857df1a77e585.tar.gz linux-2ebb2477f9a61b436dd22b75189857df1a77e585.tar.bz2 linux-2ebb2477f9a61b436dd22b75189857df1a77e585.zip | |
[POWERPC] spufs: Fix missing stop-and-signal
When there is pending signals, current spufs_run_spu() always returns
-ERESTARTSYS and it is called again automatically.
But, if spe already stopped by stop-and-signal or halt instruction,
returning -ERESTARTSYS makes stop-and-signal/halt lost and
spu run over the end-point.
For your convenience, I attached a sample code to restage this bug.
If there is no bug, printed NPC will be 0x4000.
Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/cell/spufs/run.c | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/run.c b/arch/powerpc/platforms/cell/spufs/run.c index 88a41d83a79b..c88fd7f9ea74 100644 --- a/arch/powerpc/platforms/cell/spufs/run.c +++ b/arch/powerpc/platforms/cell/spufs/run.c @@ -79,13 +79,7 @@ static inline int spu_run_fini(struct spu_context *ctx, u32 * npc, if (signal_pending(current)) ret = -ERESTARTSYS; - if (unlikely(current->ptrace & PT_PTRACED)) { - if ((*status & SPU_STATUS_STOPPED_BY_STOP) - && (*status >> SPU_STOP_STATUS_SHIFT) == 0x3fff) { - force_sig(SIGTRAP, current); - ret = -ERESTARTSYS; - } - } + return ret; } @@ -232,7 +226,7 @@ long spufs_run_spu(struct file *file, struct spu_context *ctx, if (unlikely(ctx->state != SPU_STATE_RUNNABLE)) { ret = spu_reacquire_runnable(ctx, npc, &status); if (ret) - goto out; + goto out2; continue; } ret = spu_process_events(ctx); @@ -242,10 +236,24 @@ long spufs_run_spu(struct file *file, struct spu_context *ctx, ctx->ops->runcntl_stop(ctx); ret = spu_run_fini(ctx, npc, &status); - if (!ret) - ret = status; spu_yield(ctx); +out2: + if ((ret == 0) || + ((ret == -ERESTARTSYS) && + ((status & SPU_STATUS_STOPPED_BY_HALT) || + ((status & SPU_STATUS_STOPPED_BY_STOP) && + (status >> SPU_STOP_STATUS_SHIFT != 0x2104))))) + ret = status; + + if (unlikely(current->ptrace & PT_PTRACED)) { + if ((status & SPU_STATUS_STOPPED_BY_STOP) + && (status >> SPU_STOP_STATUS_SHIFT) == 0x3fff) { + force_sig(SIGTRAP, current); + ret = -ERESTARTSYS; + } + } + out: *event = ctx->event_return; up(&ctx->run_sema); |