3 #include <linux/wait.h>
4 #include <linux/ptrace.h>
7 #include <asm/unistd.h>
11 /* interrupt-level stop callback function. */
12 void spufs_stop_callback(struct spu *spu)
14 struct spu_context *ctx = spu->ctx;
16 wake_up_all(&ctx->stop_wq);
19 void spufs_dma_callback(struct spu *spu, int type)
21 struct spu_context *ctx = spu->ctx;
23 if (ctx->flags & SPU_CREATE_EVENTS_ENABLED) {
24 ctx->event_return |= type;
25 wake_up_all(&ctx->stop_wq);
28 case SPE_EVENT_DMA_ALIGNMENT:
29 case SPE_EVENT_SPE_DATA_STORAGE:
30 case SPE_EVENT_INVALID_DMA:
31 force_sig(SIGBUS, /* info, */ current);
33 case SPE_EVENT_SPE_ERROR:
34 force_sig(SIGILL, /* info */ current);
40 static inline int spu_stopped(struct spu_context *ctx, u32 * stat)
45 *stat = ctx->ops->status_read(ctx);
46 if (ctx->state != SPU_STATE_RUNNABLE)
49 pte_fault = spu->dsisr &
50 (MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED);
51 return (!(*stat & 0x1) || pte_fault || spu->class_0_pending) ? 1 : 0;
54 static inline int spu_run_init(struct spu_context *ctx, u32 * npc)
57 unsigned long runcntl = SPU_RUNCNTL_RUNNABLE;
59 if ((ret = spu_acquire_runnable(ctx)) != 0)
62 /* if we're in isolated mode, we would have started the SPU
63 * earlier, so don't do it again now. */
64 if (!(ctx->flags & SPU_CREATE_ISOLATE)) {
65 ctx->ops->npc_write(ctx, *npc);
66 ctx->ops->runcntl_write(ctx, runcntl);
71 static inline int spu_run_fini(struct spu_context *ctx, u32 * npc,
76 *status = ctx->ops->status_read(ctx);
77 *npc = ctx->ops->npc_read(ctx);
80 if (signal_pending(current))
86 static inline int spu_reacquire_runnable(struct spu_context *ctx, u32 *npc,
91 if ((ret = spu_run_fini(ctx, npc, status)) != 0)
93 if (*status & (SPU_STATUS_STOPPED_BY_STOP |
94 SPU_STATUS_STOPPED_BY_HALT)) {
97 if ((ret = spu_run_init(ctx, npc)) != 0)
103 * SPU syscall restarting is tricky because we violate the basic
104 * assumption that the signal handler is running on the interrupted
105 * thread. Here instead, the handler runs on PowerPC user space code,
106 * while the syscall was called from the SPU.
107 * This means we can only do a very rough approximation of POSIX
110 int spu_handle_restartsys(struct spu_context *ctx, long *spu_ret,
117 case -ERESTARTNOINTR:
119 * Enter the regular syscall restarting for
120 * sys_spu_run, then restart the SPU syscall
126 case -ERESTARTNOHAND:
127 case -ERESTART_RESTARTBLOCK:
129 * Restart block is too hard for now, just return -EINTR
131 * ERESTARTNOHAND comes from sys_pause, we also return
133 * Assume that we need to be restarted ourselves though.
139 printk(KERN_WARNING "%s: unexpected return code %ld\n",
140 __FUNCTION__, *spu_ret);
146 int spu_process_callback(struct spu_context *ctx)
148 struct spu_syscall_block s;
154 /* get syscall block from local store */
155 npc = ctx->ops->npc_read(ctx);
156 ls = ctx->ops->get_ls(ctx);
157 ls_pointer = *(u32*)(ls + npc);
158 if (ls_pointer > (LS_SIZE - sizeof(s)))
160 memcpy(&s, ls + ls_pointer, sizeof (s));
162 /* do actual syscall without pinning the spu */
167 if (s.nr_ret < __NR_syscalls) {
169 /* do actual system call from here */
170 spu_ret = spu_sys_callback(&s);
171 if (spu_ret <= -ERESTARTSYS) {
172 ret = spu_handle_restartsys(ctx, &spu_ret, &npc);
175 if (ret == -ERESTARTSYS)
179 /* write result, jump over indirect pointer */
180 memcpy(ls + ls_pointer, &spu_ret, sizeof (spu_ret));
181 ctx->ops->npc_write(ctx, npc);
182 ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE);
186 static inline int spu_process_events(struct spu_context *ctx)
188 struct spu *spu = ctx->spu;
189 u64 pte_fault = MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED;
192 if (spu->dsisr & pte_fault)
193 ret = spu_irq_class_1_bottom(spu);
194 if (spu->class_0_pending)
195 ret = spu_irq_class_0_bottom(spu);
196 if (!ret && signal_pending(current))
201 long spufs_run_spu(struct file *file, struct spu_context *ctx,
202 u32 *npc, u32 *event)
207 if (down_interruptible(&ctx->run_sema))
210 ctx->ops->master_start(ctx);
211 ctx->event_return = 0;
212 ret = spu_run_init(ctx, npc);
217 ret = spufs_wait(ctx->stop_wq, spu_stopped(ctx, &status));
220 if ((status & SPU_STATUS_STOPPED_BY_STOP) &&
221 (status >> SPU_STOP_STATUS_SHIFT == 0x2104)) {
222 ret = spu_process_callback(ctx);
225 status &= ~SPU_STATUS_STOPPED_BY_STOP;
227 if (unlikely(ctx->state != SPU_STATE_RUNNABLE)) {
228 ret = spu_reacquire_runnable(ctx, npc, &status);
233 ret = spu_process_events(ctx);
235 } while (!ret && !(status & (SPU_STATUS_STOPPED_BY_STOP |
236 SPU_STATUS_STOPPED_BY_HALT)));
238 ctx->ops->master_stop(ctx);
239 ret = spu_run_fini(ctx, npc, &status);
244 ((ret == -ERESTARTSYS) &&
245 ((status & SPU_STATUS_STOPPED_BY_HALT) ||
246 ((status & SPU_STATUS_STOPPED_BY_STOP) &&
247 (status >> SPU_STOP_STATUS_SHIFT != 0x2104)))))
250 if (unlikely(current->ptrace & PT_PTRACED)) {
251 if ((status & SPU_STATUS_STOPPED_BY_STOP)
252 && (status >> SPU_STOP_STATUS_SHIFT) == 0x3fff) {
253 force_sig(SIGTRAP, current);
259 *event = ctx->event_return;