| Arnd Bergmann | ce8ab85 | 2006-01-04 20:31:29 +0100 | [diff] [blame^] | 1 | #include <linux/wait.h> |
| 2 | #include <linux/ptrace.h> |
| 3 | |
| 4 | #include <asm/spu.h> |
| 5 | |
| 6 | #include "spufs.h" |
| 7 | |
| 8 | /* interrupt-level stop callback function. */ |
| 9 | void spufs_stop_callback(struct spu *spu) |
| 10 | { |
| 11 | struct spu_context *ctx = spu->ctx; |
| 12 | |
| 13 | wake_up_all(&ctx->stop_wq); |
| 14 | } |
| 15 | |
| 16 | static inline int spu_stopped(struct spu_context *ctx, u32 * stat) |
| 17 | { |
| 18 | struct spu *spu; |
| 19 | u64 pte_fault; |
| 20 | |
| 21 | *stat = ctx->ops->status_read(ctx); |
| 22 | if (ctx->state != SPU_STATE_RUNNABLE) |
| 23 | return 1; |
| 24 | spu = ctx->spu; |
| 25 | pte_fault = spu->dsisr & |
| 26 | (MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED); |
| 27 | return (!(*stat & 0x1) || pte_fault || spu->class_0_pending) ? 1 : 0; |
| 28 | } |
| 29 | |
| 30 | static inline int spu_run_init(struct spu_context *ctx, u32 * npc, |
| 31 | u32 * status) |
| 32 | { |
| 33 | int ret; |
| 34 | |
| 35 | if ((ret = spu_acquire_runnable(ctx)) != 0) |
| 36 | return ret; |
| 37 | ctx->ops->npc_write(ctx, *npc); |
| 38 | ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE); |
| 39 | return 0; |
| 40 | } |
| 41 | |
| 42 | static inline int spu_run_fini(struct spu_context *ctx, u32 * npc, |
| 43 | u32 * status) |
| 44 | { |
| 45 | int ret = 0; |
| 46 | |
| 47 | *status = ctx->ops->status_read(ctx); |
| 48 | *npc = ctx->ops->npc_read(ctx); |
| 49 | spu_release(ctx); |
| 50 | |
| 51 | if (signal_pending(current)) |
| 52 | ret = -ERESTARTSYS; |
| 53 | if (unlikely(current->ptrace & PT_PTRACED)) { |
| 54 | if ((*status & SPU_STATUS_STOPPED_BY_STOP) |
| 55 | && (*status >> SPU_STOP_STATUS_SHIFT) == 0x3fff) { |
| 56 | force_sig(SIGTRAP, current); |
| 57 | ret = -ERESTARTSYS; |
| 58 | } |
| 59 | } |
| 60 | return ret; |
| 61 | } |
| 62 | |
| 63 | static inline int spu_reacquire_runnable(struct spu_context *ctx, u32 *npc, |
| 64 | u32 *status) |
| 65 | { |
| 66 | int ret; |
| 67 | |
| 68 | if ((ret = spu_run_fini(ctx, npc, status)) != 0) |
| 69 | return ret; |
| 70 | if (*status & (SPU_STATUS_STOPPED_BY_STOP | |
| 71 | SPU_STATUS_STOPPED_BY_HALT)) { |
| 72 | return *status; |
| 73 | } |
| 74 | if ((ret = spu_run_init(ctx, npc, status)) != 0) |
| 75 | return ret; |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | static inline int spu_process_events(struct spu_context *ctx) |
| 80 | { |
| 81 | struct spu *spu = ctx->spu; |
| 82 | u64 pte_fault = MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED; |
| 83 | int ret = 0; |
| 84 | |
| 85 | if (spu->dsisr & pte_fault) |
| 86 | ret = spu_irq_class_1_bottom(spu); |
| 87 | if (spu->class_0_pending) |
| 88 | ret = spu_irq_class_0_bottom(spu); |
| 89 | if (!ret && signal_pending(current)) |
| 90 | ret = -ERESTARTSYS; |
| 91 | return ret; |
| 92 | } |
| 93 | |
| 94 | long spufs_run_spu(struct file *file, struct spu_context *ctx, |
| 95 | u32 * npc, u32 * status) |
| 96 | { |
| 97 | int ret; |
| 98 | |
| 99 | if (down_interruptible(&ctx->run_sema)) |
| 100 | return -ERESTARTSYS; |
| 101 | |
| 102 | ret = spu_run_init(ctx, npc, status); |
| 103 | if (ret) |
| 104 | goto out; |
| 105 | |
| 106 | do { |
| 107 | ret = spufs_wait(ctx->stop_wq, spu_stopped(ctx, status)); |
| 108 | if (unlikely(ret)) |
| 109 | break; |
| 110 | if (unlikely(ctx->state != SPU_STATE_RUNNABLE)) { |
| 111 | ret = spu_reacquire_runnable(ctx, npc, status); |
| 112 | if (ret) |
| 113 | goto out; |
| 114 | continue; |
| 115 | } |
| 116 | ret = spu_process_events(ctx); |
| 117 | |
| 118 | } while (!ret && !(*status & (SPU_STATUS_STOPPED_BY_STOP | |
| 119 | SPU_STATUS_STOPPED_BY_HALT))); |
| 120 | |
| 121 | ctx->ops->runcntl_stop(ctx); |
| 122 | ret = spu_run_fini(ctx, npc, status); |
| 123 | if (!ret) |
| 124 | ret = *status; |
| 125 | spu_yield(ctx); |
| 126 | |
| 127 | out: |
| 128 | up(&ctx->run_sema); |
| 129 | return ret; |
| 130 | } |
| 131 | |