summaryrefslogtreecommitdiff
path: root/arch/powerpc/platforms/cell/spufs/run.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/platforms/cell/spufs/run.c')
-rw-r--r--arch/powerpc/platforms/cell/spufs/run.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/run.c b/arch/powerpc/platforms/cell/spufs/run.c
new file mode 100644
index 000000000000..18ea8866c61a
--- /dev/null
+++ b/arch/powerpc/platforms/cell/spufs/run.c
@@ -0,0 +1,131 @@
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+
+#include <asm/spu.h>
+
+#include "spufs.h"
+
+/* interrupt-level stop callback function. */
+void spufs_stop_callback(struct spu *spu)
+{
+ struct spu_context *ctx = spu->ctx;
+
+ wake_up_all(&ctx->stop_wq);
+}
+
+static inline int spu_stopped(struct spu_context *ctx, u32 * stat)
+{
+ struct spu *spu;
+ u64 pte_fault;
+
+ *stat = ctx->ops->status_read(ctx);
+ if (ctx->state != SPU_STATE_RUNNABLE)
+ return 1;
+ spu = ctx->spu;
+ pte_fault = spu->dsisr &
+ (MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED);
+ return (!(*stat & 0x1) || pte_fault || spu->class_0_pending) ? 1 : 0;
+}
+
+static inline int spu_run_init(struct spu_context *ctx, u32 * npc,
+ u32 * status)
+{
+ int ret;
+
+ if ((ret = spu_acquire_runnable(ctx)) != 0)
+ return ret;
+ ctx->ops->npc_write(ctx, *npc);
+ ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE);
+ return 0;
+}
+
+static inline int spu_run_fini(struct spu_context *ctx, u32 * npc,
+ u32 * status)
+{
+ int ret = 0;
+
+ *status = ctx->ops->status_read(ctx);
+ *npc = ctx->ops->npc_read(ctx);
+ spu_release(ctx);
+
+ 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;
+}
+
+static inline int spu_reacquire_runnable(struct spu_context *ctx, u32 *npc,
+ u32 *status)
+{
+ int ret;
+
+ if ((ret = spu_run_fini(ctx, npc, status)) != 0)
+ return ret;
+ if (*status & (SPU_STATUS_STOPPED_BY_STOP |
+ SPU_STATUS_STOPPED_BY_HALT)) {
+ return *status;
+ }
+ if ((ret = spu_run_init(ctx, npc, status)) != 0)
+ return ret;
+ return 0;
+}
+
+static inline int spu_process_events(struct spu_context *ctx)
+{
+ struct spu *spu = ctx->spu;
+ u64 pte_fault = MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED;
+ int ret = 0;
+
+ if (spu->dsisr & pte_fault)
+ ret = spu_irq_class_1_bottom(spu);
+ if (spu->class_0_pending)
+ ret = spu_irq_class_0_bottom(spu);
+ if (!ret && signal_pending(current))
+ ret = -ERESTARTSYS;
+ return ret;
+}
+
+long spufs_run_spu(struct file *file, struct spu_context *ctx,
+ u32 * npc, u32 * status)
+{
+ int ret;
+
+ if (down_interruptible(&ctx->run_sema))
+ return -ERESTARTSYS;
+
+ ret = spu_run_init(ctx, npc, status);
+ if (ret)
+ goto out;
+
+ do {
+ ret = spufs_wait(ctx->stop_wq, spu_stopped(ctx, status));
+ if (unlikely(ret))
+ break;
+ if (unlikely(ctx->state != SPU_STATE_RUNNABLE)) {
+ ret = spu_reacquire_runnable(ctx, npc, status);
+ if (ret)
+ goto out;
+ continue;
+ }
+ ret = spu_process_events(ctx);
+
+ } while (!ret && !(*status & (SPU_STATUS_STOPPED_BY_STOP |
+ SPU_STATUS_STOPPED_BY_HALT)));
+
+ ctx->ops->runcntl_stop(ctx);
+ ret = spu_run_fini(ctx, npc, status);
+ if (!ret)
+ ret = *status;
+ spu_yield(ctx);
+
+out:
+ up(&ctx->run_sema);
+ return ret;
+}
+