diff options
| author | Arnd Bergmann | 2005-12-06 04:52:25 +0100 |
|---|---|---|
| committer | Paul Mackerras | 2006-01-09 04:52:55 +0100 |
| commit | 5110459f181ef1f11200bb3dec61953f08cc49e7 (patch) | |
| tree | 73356ce50b3fb5055b4a6f39f237f046615f797d /arch/powerpc/platforms/cell/spufs/hw_ops.c | |
| parent | [PATCH] spufs: Turn off debugging output (diff) | |
| download | kernel-qcow2-linux-5110459f181ef1f11200bb3dec61953f08cc49e7.tar.gz kernel-qcow2-linux-5110459f181ef1f11200bb3dec61953f08cc49e7.tar.xz kernel-qcow2-linux-5110459f181ef1f11200bb3dec61953f08cc49e7.zip | |
[PATCH] spufs: Improved SPU preemptability.
This patch makes it easier to preempt an SPU context by
having the scheduler hold ctx->state_sema for much shorter
periods of time.
As part of this restructuring, the control logic for the "run"
operation is moved from arch/ppc64/kernel/spu_base.c to
fs/spufs/file.c. Of course the base retains "bottom half"
handlers for class{0,1} irqs. The new run loop will re-acquire
an SPU if preempted.
From: Mark Nutter <mnutter@us.ibm.com>
Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/cell/spufs/hw_ops.c')
| -rw-r--r-- | arch/powerpc/platforms/cell/spufs/hw_ops.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/hw_ops.c b/arch/powerpc/platforms/cell/spufs/hw_ops.c index 2e90cae98a87..68812415ee29 100644 --- a/arch/powerpc/platforms/cell/spufs/hw_ops.c +++ b/arch/powerpc/platforms/cell/spufs/hw_ops.c @@ -186,6 +186,21 @@ static char *spu_hw_get_ls(struct spu_context *ctx) return ctx->spu->local_store; } +static void spu_hw_runcntl_write(struct spu_context *ctx, u32 val) +{ + eieio(); + out_be32(&ctx->spu->problem->spu_runcntl_RW, val); +} + +static void spu_hw_runcntl_stop(struct spu_context *ctx) +{ + spin_lock_irq(&ctx->spu->register_lock); + out_be32(&ctx->spu->problem->spu_runcntl_RW, SPU_RUNCNTL_STOP); + while (in_be32(&ctx->spu->problem->spu_status_R) & SPU_STATUS_RUNNING) + cpu_relax(); + spin_unlock_irq(&ctx->spu->register_lock); +} + struct spu_context_ops spu_hw_ops = { .mbox_read = spu_hw_mbox_read, .mbox_stat_read = spu_hw_mbox_stat_read, @@ -203,4 +218,6 @@ struct spu_context_ops spu_hw_ops = { .npc_write = spu_hw_npc_write, .status_read = spu_hw_status_read, .get_ls = spu_hw_get_ls, + .runcntl_write = spu_hw_runcntl_write, + .runcntl_stop = spu_hw_runcntl_stop, }; |