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26 * Batchbuffer and command submission module.
28 * Every API draw call results in a number of GPU commands, which we
29 * collect into a "batch buffer". Typically, many draw calls are grouped
30 * into a single batch to amortize command submission overhead.
32 * We submit batches to the kernel using the I915_GEM_EXECBUFFER2 ioctl.
33 * One critical piece of data is the "validation list", which contains a
34 * list of the buffer objects (BOs) which the commands in the GPU need.
35 * The kernel will make sure these are resident and pinned at the correct
36 * virtual memory address before executing our batch. If a BO is not in
37 * the validation list, it effectively does not exist, so take care.
40 #include "iris_batch.h"
41 #include "iris_bufmgr.h"
42 #include "iris_context.h"
44 #include "drm-uapi/i915_drm.h"
46 #include "util/hash_table.h"
48 #include "main/macros.h"
53 #define FILE_DEBUG_FLAG DEBUG_BUFMGR
55 /* Terminating the batch takes either 4 bytes for MI_BATCH_BUFFER_END
56 * or 12 bytes for MI_BATCH_BUFFER_START (when chaining). Plus, we may
57 * need an extra 4 bytes to pad out to the nearest QWord. So reserve 16.
59 #define BATCH_RESERVED 16
62 iris_batch_reset(struct iris_batch
*batch
);
65 * Debugging code to dump the validation list, used by INTEL_DEBUG=submit.
68 dump_validation_list(struct iris_batch
*batch
)
70 fprintf(stderr
, "Validation list (length %d):\n", batch
->exec_count
);
72 for (int i
= 0; i
< batch
->exec_count
; i
++) {
73 uint64_t flags
= batch
->validation_list
[i
].flags
;
74 assert(batch
->validation_list
[i
].handle
==
75 batch
->exec_bos
[i
]->gem_handle
);
76 fprintf(stderr
, "[%2d]: %2d %-14s %p %-7s @ 0x%016llx (%"PRIu64
"B) - %d refs\n",
78 batch
->validation_list
[i
].handle
,
79 batch
->exec_bos
[i
]->name
,
81 (flags
& EXEC_OBJECT_WRITE
) ? "(write)" : "",
82 batch
->validation_list
[i
].offset
,
83 batch
->exec_bos
[i
]->size
,
84 batch
->exec_bos
[i
]->refcount
);
89 * Return BO information to the batch decoder (for debugging).
91 static struct gen_batch_decode_bo
92 decode_get_bo(void *v_batch
, uint64_t address
)
94 struct iris_batch
*batch
= v_batch
;
96 for (int i
= 0; i
< batch
->exec_count
; i
++) {
97 struct iris_bo
*bo
= batch
->exec_bos
[i
];
98 /* The decoder zeroes out the top 16 bits, so we need to as well */
99 uint64_t bo_address
= bo
->gtt_offset
& (~0ull >> 16);
101 if (address
>= bo_address
&& address
< bo_address
+ bo
->size
) {
102 return (struct gen_batch_decode_bo
) {
105 .map
= iris_bo_map(batch
->dbg
, bo
, MAP_READ
) +
106 (address
- bo_address
),
111 return (struct gen_batch_decode_bo
) { };
115 * Decode the current batch.
118 decode_batch(struct iris_batch
*batch
)
120 void *map
= iris_bo_map(batch
->dbg
, batch
->exec_bos
[0], MAP_READ
);
121 gen_print_batch(&batch
->decoder
, map
, batch
->primary_batch_size
,
122 batch
->exec_bos
[0]->gtt_offset
);
126 uint_key_compare(const void *a
, const void *b
)
132 uint_key_hash(const void *key
)
134 return (uintptr_t) key
;
138 iris_init_batch(struct iris_batch
*batch
,
139 struct iris_screen
*screen
,
140 struct iris_vtable
*vtbl
,
141 struct pipe_debug_callback
*dbg
,
142 struct iris_batch
**all_batches
,
146 batch
->screen
= screen
;
151 /* engine should be one of I915_EXEC_RENDER, I915_EXEC_BLT, etc. */
152 assert((engine
& ~I915_EXEC_RING_MASK
) == 0);
153 assert(util_bitcount(engine
) == 1);
154 batch
->engine
= engine
;
156 batch
->hw_ctx_id
= iris_create_hw_context(screen
->bufmgr
);
157 assert(batch
->hw_ctx_id
);
159 batch
->exec_count
= 0;
160 batch
->exec_array_size
= 100;
162 malloc(batch
->exec_array_size
* sizeof(batch
->exec_bos
[0]));
163 batch
->validation_list
=
164 malloc(batch
->exec_array_size
* sizeof(batch
->validation_list
[0]));
166 batch
->cache
.render
= _mesa_hash_table_create(NULL
, _mesa_hash_pointer
,
167 _mesa_key_pointer_equal
);
168 batch
->cache
.depth
= _mesa_set_create(NULL
, _mesa_hash_pointer
,
169 _mesa_key_pointer_equal
);
171 memset(batch
->other_batches
, 0, sizeof(batch
->other_batches
));
173 for (int i
= 0, j
= 0; i
< IRIS_BATCH_COUNT
; i
++) {
174 if (all_batches
[i
] != batch
)
175 batch
->other_batches
[j
++] = all_batches
[i
];
178 if (unlikely(INTEL_DEBUG
)) {
180 _mesa_hash_table_create(NULL
, uint_key_hash
, uint_key_compare
);
182 const unsigned decode_flags
=
183 GEN_BATCH_DECODE_FULL
|
184 ((INTEL_DEBUG
& DEBUG_COLOR
) ? GEN_BATCH_DECODE_IN_COLOR
: 0) |
185 GEN_BATCH_DECODE_OFFSETS
|
186 GEN_BATCH_DECODE_FLOATS
;
188 gen_batch_decode_ctx_init(&batch
->decoder
, &screen
->devinfo
,
189 stderr
, decode_flags
, NULL
,
190 decode_get_bo
, NULL
, batch
);
191 batch
->decoder
.max_vbo_decoded_lines
= 32;
194 iris_batch_reset(batch
);
197 #define READ_ONCE(x) (*(volatile __typeof__(x) *)&(x))
199 static struct drm_i915_gem_exec_object2
*
200 find_validation_entry(struct iris_batch
*batch
, struct iris_bo
*bo
)
202 unsigned index
= READ_ONCE(bo
->index
);
204 if (index
< batch
->exec_count
&& batch
->exec_bos
[index
] == bo
)
205 return &batch
->validation_list
[index
];
207 /* May have been shared between multiple active batches */
208 for (index
= 0; index
< batch
->exec_count
; index
++) {
209 if (batch
->exec_bos
[index
] == bo
)
210 return &batch
->validation_list
[index
];
217 * Add a buffer to the current batch's validation list.
219 * You must call this on any BO you wish to use in this batch, to ensure
220 * that it's resident when the GPU commands execute.
223 iris_use_pinned_bo(struct iris_batch
*batch
,
227 assert(bo
->kflags
& EXEC_OBJECT_PINNED
);
229 struct drm_i915_gem_exec_object2
*existing_entry
=
230 find_validation_entry(batch
, bo
);
232 if (existing_entry
) {
233 /* The BO is already in the validation list; mark it writable */
235 existing_entry
->flags
|= EXEC_OBJECT_WRITE
;
240 /* This is the first time our batch has seen this BO. Before we use it,
241 * we need to see if other batches reference it - if so, we should flush
244 for (int b
= 0; b
< ARRAY_SIZE(batch
->other_batches
); b
++) {
245 // XXX: this is bad, we use the same state / instruction buffers for
246 // both batches, and if both of them are reading some dynamic state,
247 // we flush all the time. check for writes vs. reads?
248 if (iris_batch_references(batch
->other_batches
[b
], bo
))
249 iris_batch_flush(batch
->other_batches
[b
]);
252 /* Now, take a reference and add it to the validation list. */
253 iris_bo_reference(bo
);
255 if (batch
->exec_count
== batch
->exec_array_size
) {
256 batch
->exec_array_size
*= 2;
258 realloc(batch
->exec_bos
,
259 batch
->exec_array_size
* sizeof(batch
->exec_bos
[0]));
260 batch
->validation_list
=
261 realloc(batch
->validation_list
,
262 batch
->exec_array_size
* sizeof(batch
->validation_list
[0]));
265 batch
->validation_list
[batch
->exec_count
] =
266 (struct drm_i915_gem_exec_object2
) {
267 .handle
= bo
->gem_handle
,
268 .offset
= bo
->gtt_offset
,
269 .flags
= bo
->kflags
| (writable
? EXEC_OBJECT_WRITE
: 0),
272 bo
->index
= batch
->exec_count
;
273 batch
->exec_bos
[batch
->exec_count
] = bo
;
274 batch
->aperture_space
+= bo
->size
;
280 create_batch(struct iris_batch
*batch
)
282 struct iris_screen
*screen
= batch
->screen
;
283 struct iris_bufmgr
*bufmgr
= screen
->bufmgr
;
285 batch
->bo
= iris_bo_alloc(bufmgr
, "command buffer",
286 BATCH_SZ
+ BATCH_RESERVED
, IRIS_MEMZONE_OTHER
);
287 batch
->bo
->kflags
|= EXEC_OBJECT_CAPTURE
;
288 batch
->map
= iris_bo_map(NULL
, batch
->bo
, MAP_READ
| MAP_WRITE
);
289 batch
->map_next
= batch
->map
;
291 iris_use_pinned_bo(batch
, batch
->bo
, false);
295 iris_batch_reset(struct iris_batch
*batch
)
297 if (batch
->last_bo
!= NULL
) {
298 iris_bo_unreference(batch
->last_bo
);
299 batch
->last_bo
= NULL
;
301 batch
->last_bo
= batch
->bo
;
302 batch
->primary_batch_size
= 0;
303 batch
->contains_draw
= false;
306 assert(batch
->bo
->index
== 0);
308 if (batch
->state_sizes
)
309 _mesa_hash_table_clear(batch
->state_sizes
, NULL
);
311 iris_cache_sets_clear(batch
);
315 iris_batch_free(struct iris_batch
*batch
)
317 struct iris_screen
*screen
= batch
->screen
;
318 struct iris_bufmgr
*bufmgr
= screen
->bufmgr
;
320 for (int i
= 0; i
< batch
->exec_count
; i
++) {
321 iris_bo_unreference(batch
->exec_bos
[i
]);
323 free(batch
->exec_bos
);
324 free(batch
->validation_list
);
325 iris_bo_unreference(batch
->bo
);
328 batch
->map_next
= NULL
;
330 iris_bo_unreference(batch
->last_bo
);
332 iris_destroy_hw_context(bufmgr
, batch
->hw_ctx_id
);
334 _mesa_hash_table_destroy(batch
->cache
.render
, NULL
);
335 _mesa_set_destroy(batch
->cache
.depth
, NULL
);
337 if (batch
->state_sizes
) {
338 _mesa_hash_table_destroy(batch
->state_sizes
, NULL
);
339 gen_batch_decode_ctx_finish(&batch
->decoder
);
344 * If we've chained to a secondary batch, or are getting near to the end,
345 * then flush. This should only be called between draws.
348 iris_batch_maybe_flush(struct iris_batch
*batch
, unsigned estimate
)
350 if (batch
->bo
!= batch
->exec_bos
[0] ||
351 iris_batch_bytes_used(batch
) + estimate
>= BATCH_SZ
) {
352 iris_batch_flush(batch
);
357 iris_chain_to_new_batch(struct iris_batch
*batch
)
359 /* We only support chaining a single time. */
360 assert(batch
->bo
== batch
->exec_bos
[0]);
362 uint32_t *cmd
= batch
->map_next
;
363 uint64_t *addr
= batch
->map_next
+ 4;
364 batch
->map_next
+= 8;
366 /* No longer held by batch->bo, still held by validation list */
367 iris_bo_unreference(batch
->bo
);
368 batch
->primary_batch_size
= iris_batch_bytes_used(batch
);
371 /* Emit MI_BATCH_BUFFER_START to chain to another batch. */
372 *cmd
= (0x31 << 23) | (1 << 8) | (3 - 2);
373 *addr
= batch
->bo
->gtt_offset
;
377 * Terminate a batch with MI_BATCH_BUFFER_END.
380 iris_finish_batch(struct iris_batch
*batch
)
384 /* Emit MI_BATCH_BUFFER_END to finish our batch. */
385 uint32_t *map
= batch
->map_next
;
387 map
[0] = (0xA << 23);
389 batch
->map_next
+= 4;
391 if (batch
->bo
== batch
->exec_bos
[0])
392 batch
->primary_batch_size
= iris_batch_bytes_used(batch
);
396 * Submit the batch to the GPU via execbuffer2.
399 submit_batch(struct iris_batch
*batch
, int in_fence_fd
, int *out_fence_fd
)
401 iris_bo_unmap(batch
->bo
);
403 /* The requirement for using I915_EXEC_NO_RELOC are:
405 * The addresses written in the objects must match the corresponding
406 * reloc.gtt_offset which in turn must match the corresponding
409 * Any render targets written to in the batch must be flagged with
412 * To avoid stalling, execobject.offset should match the current
413 * address of that object within the active context.
415 struct drm_i915_gem_execbuffer2 execbuf
= {
416 .buffers_ptr
= (uintptr_t) batch
->validation_list
,
417 .buffer_count
= batch
->exec_count
,
418 .batch_start_offset
= 0,
419 /* This must be QWord aligned. */
420 .batch_len
= ALIGN(batch
->primary_batch_size
, 8),
421 .flags
= batch
->engine
|
423 I915_EXEC_BATCH_FIRST
|
424 I915_EXEC_HANDLE_LUT
,
425 .rsvd1
= batch
->hw_ctx_id
, /* rsvd1 is actually the context ID */
428 unsigned long cmd
= DRM_IOCTL_I915_GEM_EXECBUFFER2
;
430 if (in_fence_fd
!= -1) {
431 execbuf
.rsvd2
= in_fence_fd
;
432 execbuf
.flags
|= I915_EXEC_FENCE_IN
;
435 if (out_fence_fd
!= NULL
) {
436 cmd
= DRM_IOCTL_I915_GEM_EXECBUFFER2_WR
;
438 execbuf
.flags
|= I915_EXEC_FENCE_OUT
;
441 int ret
= drm_ioctl(batch
->screen
->fd
, cmd
, &execbuf
);
444 DBG("execbuf FAILED: errno = %d\n", -ret
);
445 fprintf(stderr
, "execbuf FAILED: errno = %d\n", -ret
);
448 DBG("execbuf succeeded\n");
451 for (int i
= 0; i
< batch
->exec_count
; i
++) {
452 struct iris_bo
*bo
= batch
->exec_bos
[i
];
458 if (ret
== 0 && out_fence_fd
!= NULL
)
459 *out_fence_fd
= execbuf
.rsvd2
>> 32;
465 * Flush the batch buffer, submitting it to the GPU and resetting it so
466 * we're ready to emit the next batch.
468 * \param in_fence_fd is ignored if -1. Otherwise, this function takes
469 * ownership of the fd.
471 * \param out_fence_fd is ignored if NULL. Otherwise, the caller must
472 * take ownership of the returned fd.
475 _iris_batch_flush_fence(struct iris_batch
*batch
,
476 int in_fence_fd
, int *out_fence_fd
,
477 const char *file
, int line
)
479 if (iris_batch_bytes_used(batch
) == 0)
482 iris_finish_batch(batch
);
484 if (unlikely(INTEL_DEBUG
& (DEBUG_BATCH
| DEBUG_SUBMIT
))) {
485 int bytes_for_commands
= iris_batch_bytes_used(batch
);
486 int second_bytes
= 0;
487 if (batch
->bo
!= batch
->exec_bos
[0]) {
488 second_bytes
= bytes_for_commands
;
489 bytes_for_commands
+= batch
->primary_batch_size
;
491 fprintf(stderr
, "%19s:%-3d: %s batch [%u] flush with %5d+%5db (%0.1f%%) "
492 "(cmds), %4d BOs (%0.1fMb aperture)\n",
493 file
, line
, batch
->name
, batch
->hw_ctx_id
,
494 batch
->primary_batch_size
, second_bytes
,
495 100.0f
* bytes_for_commands
/ BATCH_SZ
,
497 (float) batch
->aperture_space
/ (1024 * 1024));
498 dump_validation_list(batch
);
501 if (unlikely(INTEL_DEBUG
& DEBUG_BATCH
)) {
505 int ret
= submit_batch(batch
, in_fence_fd
, out_fence_fd
);
510 //if (iris->ctx.Const.ResetStrategy == GL_LOSE_CONTEXT_ON_RESET_ARB)
511 //iris_check_for_reset(ice);
513 if (unlikely(INTEL_DEBUG
& DEBUG_SYNC
)) {
514 dbg_printf("waiting for idle\n");
515 iris_bo_wait_rendering(batch
->bo
);
519 const bool color
= INTEL_DEBUG
& DEBUG_COLOR
;
520 fprintf(stderr
, "%siris: Failed to submit batchbuffer: %-80s%s\n",
521 color
? "\e[1;41m" : "", strerror(-ret
), color
? "\e[0m" : "");
526 /* Clean up after the batch we submitted and prepare for a new one. */
527 for (int i
= 0; i
< batch
->exec_count
; i
++) {
528 iris_bo_unreference(batch
->exec_bos
[i
]);
529 batch
->exec_bos
[i
] = NULL
;
531 batch
->exec_count
= 0;
532 batch
->aperture_space
= 0;
534 /* Start a new batch buffer. */
535 iris_batch_reset(batch
);
541 * Does the current batch refer to the given BO?
543 * (In other words, is the BO in the current batch's validation list?)
546 iris_batch_references(struct iris_batch
*batch
, struct iris_bo
*bo
)
548 return find_validation_entry(batch
, bo
) != NULL
;