Commit | Line | Data |
---|---|---|
0afacde3 | 1 | #define DEBUG |
2 | ||
ce8ab854 AB |
3 | #include <linux/wait.h> |
4 | #include <linux/ptrace.h> | |
5 | ||
6 | #include <asm/spu.h> | |
c6730ed4 JK |
7 | #include <asm/spu_priv1.h> |
8 | #include <asm/io.h> | |
cfff5b23 | 9 | #include <asm/unistd.h> |
ce8ab854 AB |
10 | |
11 | #include "spufs.h" | |
12 | ||
13 | /* interrupt-level stop callback function. */ | |
f3d69e05 | 14 | void spufs_stop_callback(struct spu *spu, int irq) |
ce8ab854 AB |
15 | { |
16 | struct spu_context *ctx = spu->ctx; | |
17 | ||
d6ad39bc JK |
18 | /* |
19 | * It should be impossible to preempt a context while an exception | |
20 | * is being processed, since the context switch code is specially | |
21 | * coded to deal with interrupts ... But, just in case, sanity check | |
22 | * the context pointer. It is OK to return doing nothing since | |
23 | * the exception will be regenerated when the context is resumed. | |
24 | */ | |
25 | if (ctx) { | |
26 | /* Copy exception arguments into module specific structure */ | |
f3d69e05 LB |
27 | switch(irq) { |
28 | case 0 : | |
29 | ctx->csa.class_0_pending = spu->class_0_pending; | |
f3d69e05 LB |
30 | ctx->csa.class_0_dar = spu->class_0_dar; |
31 | break; | |
32 | case 1 : | |
33 | ctx->csa.class_1_dsisr = spu->class_1_dsisr; | |
34 | ctx->csa.class_1_dar = spu->class_1_dar; | |
35 | break; | |
36 | case 2 : | |
37 | break; | |
38 | } | |
d6ad39bc JK |
39 | |
40 | /* ensure that the exception status has hit memory before a | |
41 | * thread waiting on the context's stop queue is woken */ | |
42 | smp_wmb(); | |
43 | ||
44 | wake_up_all(&ctx->stop_wq); | |
45 | } | |
ce8ab854 AB |
46 | } |
47 | ||
e65c2f6f | 48 | int spu_stopped(struct spu_context *ctx, u32 *stat) |
ce8ab854 | 49 | { |
e65c2f6f LB |
50 | u64 dsisr; |
51 | u32 stopped; | |
ce8ab854 | 52 | |
d84050f4 LB |
53 | stopped = SPU_STATUS_INVALID_INSTR | SPU_STATUS_SINGLE_STEP | |
54 | SPU_STATUS_STOPPED_BY_HALT | SPU_STATUS_STOPPED_BY_STOP; | |
36aaccc1 | 55 | |
d84050f4 LB |
56 | top: |
57 | *stat = ctx->ops->status_read(ctx); | |
58 | if (*stat & stopped) { | |
59 | /* | |
60 | * If the spu hasn't finished stopping, we need to | |
61 | * re-read the register to get the stopped value. | |
62 | */ | |
63 | if (*stat & SPU_STATUS_RUNNING) | |
64 | goto top; | |
e65c2f6f | 65 | return 1; |
d84050f4 | 66 | } |
e65c2f6f | 67 | |
d84050f4 | 68 | if (test_bit(SPU_SCHED_NOTIFY_ACTIVE, &ctx->sched_flags)) |
e65c2f6f LB |
69 | return 1; |
70 | ||
f3d69e05 | 71 | dsisr = ctx->csa.class_1_dsisr; |
e65c2f6f | 72 | if (dsisr & (MFC_DSISR_PTE_NOT_FOUND | MFC_DSISR_ACCESS_DENIED)) |
36aaccc1 | 73 | return 1; |
e65c2f6f LB |
74 | |
75 | if (ctx->csa.class_0_pending) | |
76 | return 1; | |
77 | ||
78 | return 0; | |
ce8ab854 AB |
79 | } |
80 | ||
c6730ed4 JK |
81 | static int spu_setup_isolated(struct spu_context *ctx) |
82 | { | |
83 | int ret; | |
84 | u64 __iomem *mfc_cntl; | |
85 | u64 sr1; | |
86 | u32 status; | |
87 | unsigned long timeout; | |
88 | const u32 status_loading = SPU_STATUS_RUNNING | |
89 | | SPU_STATUS_ISOLATED_STATE | SPU_STATUS_ISOLATED_LOAD_STATUS; | |
90 | ||
7ec18ab9 | 91 | ret = -ENODEV; |
c6730ed4 | 92 | if (!isolated_loader) |
c6730ed4 JK |
93 | goto out; |
94 | ||
7ec18ab9 CH |
95 | /* |
96 | * We need to exclude userspace access to the context. | |
97 | * | |
98 | * To protect against memory access we invalidate all ptes | |
99 | * and make sure the pagefault handlers block on the mutex. | |
100 | */ | |
101 | spu_unmap_mappings(ctx); | |
102 | ||
c6730ed4 JK |
103 | mfc_cntl = &ctx->spu->priv2->mfc_control_RW; |
104 | ||
105 | /* purge the MFC DMA queue to ensure no spurious accesses before we | |
106 | * enter kernel mode */ | |
107 | timeout = jiffies + HZ; | |
108 | out_be64(mfc_cntl, MFC_CNTL_PURGE_DMA_REQUEST); | |
109 | while ((in_be64(mfc_cntl) & MFC_CNTL_PURGE_DMA_STATUS_MASK) | |
110 | != MFC_CNTL_PURGE_DMA_COMPLETE) { | |
111 | if (time_after(jiffies, timeout)) { | |
112 | printk(KERN_ERR "%s: timeout flushing MFC DMA queue\n", | |
e48b1b45 | 113 | __func__); |
c6730ed4 | 114 | ret = -EIO; |
7ec18ab9 | 115 | goto out; |
c6730ed4 JK |
116 | } |
117 | cond_resched(); | |
118 | } | |
119 | ||
120 | /* put the SPE in kernel mode to allow access to the loader */ | |
121 | sr1 = spu_mfc_sr1_get(ctx->spu); | |
122 | sr1 &= ~MFC_STATE1_PROBLEM_STATE_MASK; | |
123 | spu_mfc_sr1_set(ctx->spu, sr1); | |
124 | ||
125 | /* start the loader */ | |
126 | ctx->ops->signal1_write(ctx, (unsigned long)isolated_loader >> 32); | |
127 | ctx->ops->signal2_write(ctx, | |
128 | (unsigned long)isolated_loader & 0xffffffff); | |
129 | ||
130 | ctx->ops->runcntl_write(ctx, | |
131 | SPU_RUNCNTL_RUNNABLE | SPU_RUNCNTL_ISOLATE); | |
132 | ||
133 | ret = 0; | |
134 | timeout = jiffies + HZ; | |
135 | while (((status = ctx->ops->status_read(ctx)) & status_loading) == | |
136 | status_loading) { | |
137 | if (time_after(jiffies, timeout)) { | |
138 | printk(KERN_ERR "%s: timeout waiting for loader\n", | |
e48b1b45 | 139 | __func__); |
c6730ed4 JK |
140 | ret = -EIO; |
141 | goto out_drop_priv; | |
142 | } | |
143 | cond_resched(); | |
144 | } | |
145 | ||
146 | if (!(status & SPU_STATUS_RUNNING)) { | |
147 | /* If isolated LOAD has failed: run SPU, we will get a stop-and | |
148 | * signal later. */ | |
e48b1b45 | 149 | pr_debug("%s: isolated LOAD failed\n", __func__); |
c6730ed4 JK |
150 | ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE); |
151 | ret = -EACCES; | |
7ec18ab9 CH |
152 | goto out_drop_priv; |
153 | } | |
c6730ed4 | 154 | |
7ec18ab9 | 155 | if (!(status & SPU_STATUS_ISOLATED_STATE)) { |
c6730ed4 | 156 | /* This isn't allowed by the CBEA, but check anyway */ |
e48b1b45 | 157 | pr_debug("%s: SPU fell out of isolated mode?\n", __func__); |
c6730ed4 JK |
158 | ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_STOP); |
159 | ret = -EINVAL; | |
7ec18ab9 | 160 | goto out_drop_priv; |
c6730ed4 JK |
161 | } |
162 | ||
163 | out_drop_priv: | |
164 | /* Finished accessing the loader. Drop kernel mode */ | |
165 | sr1 |= MFC_STATE1_PROBLEM_STATE_MASK; | |
166 | spu_mfc_sr1_set(ctx->spu, sr1); | |
167 | ||
c6730ed4 JK |
168 | out: |
169 | return ret; | |
170 | } | |
171 | ||
36aaccc1 | 172 | static int spu_run_init(struct spu_context *ctx, u32 *npc) |
ce8ab854 | 173 | { |
e65c2f6f | 174 | unsigned long runcntl = SPU_RUNCNTL_RUNNABLE; |
91569531 | 175 | int ret; |
cc210b3e | 176 | |
27ec41d3 AD |
177 | spuctx_switch_state(ctx, SPU_UTIL_SYSTEM); |
178 | ||
e65c2f6f LB |
179 | /* |
180 | * NOSCHED is synchronous scheduling with respect to the caller. | |
181 | * The caller waits for the context to be loaded. | |
182 | */ | |
183 | if (ctx->flags & SPU_CREATE_NOSCHED) { | |
91569531 | 184 | if (ctx->state == SPU_STATE_SAVED) { |
91569531 LB |
185 | ret = spu_activate(ctx, 0); |
186 | if (ret) | |
187 | return ret; | |
188 | } | |
e65c2f6f | 189 | } |
aa45e256 | 190 | |
e65c2f6f LB |
191 | /* |
192 | * Apply special setup as required. | |
193 | */ | |
194 | if (ctx->flags & SPU_CREATE_ISOLATE) { | |
c6730ed4 | 195 | if (!(ctx->ops->status_read(ctx) & SPU_STATUS_ISOLATED_STATE)) { |
91569531 | 196 | ret = spu_setup_isolated(ctx); |
7ec18ab9 | 197 | if (ret) |
aa45e256 | 198 | return ret; |
c6730ed4 JK |
199 | } |
200 | ||
91569531 LB |
201 | /* |
202 | * If userspace has set the runcntrl register (eg, to | |
203 | * issue an isolated exit), we need to re-set it here | |
204 | */ | |
c6730ed4 JK |
205 | runcntl = ctx->ops->runcntl_read(ctx) & |
206 | (SPU_RUNCNTL_RUNNABLE | SPU_RUNCNTL_ISOLATE); | |
207 | if (runcntl == 0) | |
208 | runcntl = SPU_RUNCNTL_RUNNABLE; | |
2eb1b120 | 209 | } else { |
cc210b3e LB |
210 | unsigned long privcntl; |
211 | ||
05169237 | 212 | if (test_thread_flag(TIF_SINGLESTEP)) |
cc210b3e LB |
213 | privcntl = SPU_PRIVCNTL_MODE_SINGLE_STEP; |
214 | else | |
215 | privcntl = SPU_PRIVCNTL_MODE_NORMAL; | |
cc210b3e | 216 | |
cc210b3e | 217 | ctx->ops->privcntl_write(ctx, privcntl); |
d9dd421f JK |
218 | ctx->ops->npc_write(ctx, *npc); |
219 | } | |
220 | ||
221 | ctx->ops->runcntl_write(ctx, runcntl); | |
222 | ||
223 | if (ctx->flags & SPU_CREATE_NOSCHED) { | |
224 | spuctx_switch_state(ctx, SPU_UTIL_USER); | |
225 | } else { | |
c6730ed4 | 226 | |
91569531 | 227 | if (ctx->state == SPU_STATE_SAVED) { |
91569531 LB |
228 | ret = spu_activate(ctx, 0); |
229 | if (ret) | |
230 | return ret; | |
e65c2f6f LB |
231 | } else { |
232 | spuctx_switch_state(ctx, SPU_UTIL_USER); | |
91569531 | 233 | } |
91569531 | 234 | } |
27ec41d3 | 235 | |
ce7c191b | 236 | set_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags); |
aa45e256 | 237 | return 0; |
ce8ab854 AB |
238 | } |
239 | ||
36aaccc1 BN |
240 | static int spu_run_fini(struct spu_context *ctx, u32 *npc, |
241 | u32 *status) | |
ce8ab854 AB |
242 | { |
243 | int ret = 0; | |
244 | ||
e65c2f6f LB |
245 | spu_del_from_rq(ctx); |
246 | ||
ce8ab854 AB |
247 | *status = ctx->ops->status_read(ctx); |
248 | *npc = ctx->ops->npc_read(ctx); | |
27ec41d3 AD |
249 | |
250 | spuctx_switch_state(ctx, SPU_UTIL_IDLE_LOADED); | |
ce7c191b | 251 | clear_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags); |
f5ed0eb6 | 252 | spu_switch_log_notify(NULL, ctx, SWITCH_LOG_EXIT, *status); |
ce8ab854 AB |
253 | spu_release(ctx); |
254 | ||
255 | if (signal_pending(current)) | |
256 | ret = -ERESTARTSYS; | |
2ebb2477 | 257 | |
ce8ab854 AB |
258 | return ret; |
259 | } | |
260 | ||
2dd14934 AB |
261 | /* |
262 | * SPU syscall restarting is tricky because we violate the basic | |
263 | * assumption that the signal handler is running on the interrupted | |
264 | * thread. Here instead, the handler runs on PowerPC user space code, | |
265 | * while the syscall was called from the SPU. | |
266 | * This means we can only do a very rough approximation of POSIX | |
267 | * signal semantics. | |
268 | */ | |
1238819a | 269 | static int spu_handle_restartsys(struct spu_context *ctx, long *spu_ret, |
2dd14934 AB |
270 | unsigned int *npc) |
271 | { | |
272 | int ret; | |
273 | ||
274 | switch (*spu_ret) { | |
275 | case -ERESTARTSYS: | |
276 | case -ERESTARTNOINTR: | |
277 | /* | |
278 | * Enter the regular syscall restarting for | |
279 | * sys_spu_run, then restart the SPU syscall | |
280 | * callback. | |
281 | */ | |
282 | *npc -= 8; | |
283 | ret = -ERESTARTSYS; | |
284 | break; | |
285 | case -ERESTARTNOHAND: | |
286 | case -ERESTART_RESTARTBLOCK: | |
287 | /* | |
288 | * Restart block is too hard for now, just return -EINTR | |
289 | * to the SPU. | |
290 | * ERESTARTNOHAND comes from sys_pause, we also return | |
291 | * -EINTR from there. | |
292 | * Assume that we need to be restarted ourselves though. | |
293 | */ | |
294 | *spu_ret = -EINTR; | |
295 | ret = -ERESTARTSYS; | |
296 | break; | |
297 | default: | |
298 | printk(KERN_WARNING "%s: unexpected return code %ld\n", | |
e48b1b45 | 299 | __func__, *spu_ret); |
2dd14934 AB |
300 | ret = 0; |
301 | } | |
302 | return ret; | |
303 | } | |
304 | ||
1238819a | 305 | static int spu_process_callback(struct spu_context *ctx) |
2dd14934 AB |
306 | { |
307 | struct spu_syscall_block s; | |
308 | u32 ls_pointer, npc; | |
9e2fe2ce | 309 | void __iomem *ls; |
2dd14934 | 310 | long spu_ret; |
d29694f0 | 311 | int ret; |
2dd14934 AB |
312 | |
313 | /* get syscall block from local store */ | |
9e2fe2ce AM |
314 | npc = ctx->ops->npc_read(ctx) & ~3; |
315 | ls = (void __iomem *)ctx->ops->get_ls(ctx); | |
316 | ls_pointer = in_be32(ls + npc); | |
2dd14934 AB |
317 | if (ls_pointer > (LS_SIZE - sizeof(s))) |
318 | return -EFAULT; | |
9e2fe2ce | 319 | memcpy_fromio(&s, ls + ls_pointer, sizeof(s)); |
2dd14934 AB |
320 | |
321 | /* do actual syscall without pinning the spu */ | |
322 | ret = 0; | |
323 | spu_ret = -ENOSYS; | |
324 | npc += 4; | |
325 | ||
326 | if (s.nr_ret < __NR_syscalls) { | |
327 | spu_release(ctx); | |
328 | /* do actual system call from here */ | |
329 | spu_ret = spu_sys_callback(&s); | |
330 | if (spu_ret <= -ERESTARTSYS) { | |
331 | ret = spu_handle_restartsys(ctx, &spu_ret, &npc); | |
332 | } | |
d29694f0 | 333 | mutex_lock(&ctx->state_mutex); |
2dd14934 AB |
334 | if (ret == -ERESTARTSYS) |
335 | return ret; | |
336 | } | |
337 | ||
4eb5aef5 JK |
338 | /* need to re-get the ls, as it may have changed when we released the |
339 | * spu */ | |
340 | ls = (void __iomem *)ctx->ops->get_ls(ctx); | |
341 | ||
2dd14934 | 342 | /* write result, jump over indirect pointer */ |
9e2fe2ce | 343 | memcpy_toio(ls + ls_pointer, &spu_ret, sizeof(spu_ret)); |
2dd14934 AB |
344 | ctx->ops->npc_write(ctx, npc); |
345 | ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE); | |
346 | return ret; | |
347 | } | |
348 | ||
50af32a9 | 349 | long spufs_run_spu(struct spu_context *ctx, u32 *npc, u32 *event) |
ce8ab854 AB |
350 | { |
351 | int ret; | |
36aaccc1 | 352 | struct spu *spu; |
9add11da | 353 | u32 status; |
ce8ab854 | 354 | |
e45d48a3 | 355 | if (mutex_lock_interruptible(&ctx->run_mutex)) |
ce8ab854 AB |
356 | return -ERESTARTSYS; |
357 | ||
9add11da | 358 | ctx->event_return = 0; |
aa45e256 | 359 | |
c9101bdb CH |
360 | ret = spu_acquire(ctx); |
361 | if (ret) | |
362 | goto out_unlock; | |
2cf2b3b4 | 363 | |
c0bace5c JK |
364 | spu_enable_spu(ctx); |
365 | ||
91569531 | 366 | spu_update_sched_info(ctx); |
aa45e256 CH |
367 | |
368 | ret = spu_run_init(ctx, npc); | |
369 | if (ret) { | |
370 | spu_release(ctx); | |
ce8ab854 | 371 | goto out; |
aa45e256 | 372 | } |
ce8ab854 AB |
373 | |
374 | do { | |
9add11da | 375 | ret = spufs_wait(ctx->stop_wq, spu_stopped(ctx, &status)); |
eebead5b CH |
376 | if (unlikely(ret)) { |
377 | /* | |
378 | * This is nasty: we need the state_mutex for all the | |
379 | * bookkeeping even if the syscall was interrupted by | |
380 | * a signal. ewww. | |
381 | */ | |
382 | mutex_lock(&ctx->state_mutex); | |
ce8ab854 | 383 | break; |
eebead5b | 384 | } |
36aaccc1 BN |
385 | spu = ctx->spu; |
386 | if (unlikely(test_and_clear_bit(SPU_SCHED_NOTIFY_ACTIVE, | |
387 | &ctx->sched_flags))) { | |
388 | if (!(status & SPU_STATUS_STOPPED_BY_STOP)) { | |
389 | spu_switch_notify(spu, ctx); | |
390 | continue; | |
391 | } | |
392 | } | |
27ec41d3 AD |
393 | |
394 | spuctx_switch_state(ctx, SPU_UTIL_SYSTEM); | |
395 | ||
9add11da AB |
396 | if ((status & SPU_STATUS_STOPPED_BY_STOP) && |
397 | (status >> SPU_STOP_STATUS_SHIFT == 0x2104)) { | |
2dd14934 AB |
398 | ret = spu_process_callback(ctx); |
399 | if (ret) | |
400 | break; | |
9add11da | 401 | status &= ~SPU_STATUS_STOPPED_BY_STOP; |
2dd14934 | 402 | } |
57dace23 AB |
403 | ret = spufs_handle_class1(ctx); |
404 | if (ret) | |
405 | break; | |
406 | ||
d6ad39bc JK |
407 | ret = spufs_handle_class0(ctx); |
408 | if (ret) | |
409 | break; | |
410 | ||
d6ad39bc JK |
411 | if (signal_pending(current)) |
412 | ret = -ERESTARTSYS; | |
9add11da | 413 | } while (!ret && !(status & (SPU_STATUS_STOPPED_BY_STOP | |
05169237 BH |
414 | SPU_STATUS_STOPPED_BY_HALT | |
415 | SPU_STATUS_SINGLE_STEP))); | |
ce8ab854 | 416 | |
c25620d7 | 417 | spu_disable_spu(ctx); |
9add11da | 418 | ret = spu_run_fini(ctx, npc, &status); |
ce8ab854 AB |
419 | spu_yield(ctx); |
420 | ||
e66686b4 LB |
421 | if ((status & SPU_STATUS_STOPPED_BY_STOP) && |
422 | (((status >> SPU_STOP_STATUS_SHIFT) & 0x3f00) == 0x2100)) | |
423 | ctx->stats.libassist++; | |
424 | ||
2ebb2477 MN |
425 | if ((ret == 0) || |
426 | ((ret == -ERESTARTSYS) && | |
427 | ((status & SPU_STATUS_STOPPED_BY_HALT) || | |
05169237 | 428 | (status & SPU_STATUS_SINGLE_STEP) || |
2ebb2477 MN |
429 | ((status & SPU_STATUS_STOPPED_BY_STOP) && |
430 | (status >> SPU_STOP_STATUS_SHIFT != 0x2104))))) | |
431 | ret = status; | |
432 | ||
05169237 BH |
433 | /* Note: we don't need to force_sig SIGTRAP on single-step |
434 | * since we have TIF_SINGLESTEP set, thus the kernel will do | |
435 | * it upon return from the syscall anyawy | |
436 | */ | |
60cf54db JK |
437 | if (unlikely(status & SPU_STATUS_SINGLE_STEP)) |
438 | ret = -ERESTARTSYS; | |
439 | ||
440 | else if (unlikely((status & SPU_STATUS_STOPPED_BY_STOP) | |
441 | && (status >> SPU_STOP_STATUS_SHIFT) == 0x3fff)) { | |
c2b2226c AB |
442 | force_sig(SIGTRAP, current); |
443 | ret = -ERESTARTSYS; | |
2ebb2477 MN |
444 | } |
445 | ||
ce8ab854 | 446 | out: |
9add11da | 447 | *event = ctx->event_return; |
c9101bdb | 448 | out_unlock: |
e45d48a3 | 449 | mutex_unlock(&ctx->run_mutex); |
ce8ab854 AB |
450 | return ret; |
451 | } |