1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _INTEL_RINGBUFFER_H_
3 #define _INTEL_RINGBUFFER_H_
5 #include <linux/hashtable.h>
6 #include "i915_gem_batch_pool.h"
7 #include "i915_gem_request.h"
8 #include "i915_gem_timeline.h"
9 #include "i915_selftest.h"
13 #define I915_CMD_HASH_ORDER 9
15 /* Early gen2 devices have a cacheline of just 32 bytes, using 64 is overkill,
16 * but keeps the logic simple. Indeed, the whole purpose of this macro is just
17 * to give some inclination as to some of the magic values used in the various
20 #define CACHELINE_BYTES 64
21 #define CACHELINE_DWORDS (CACHELINE_BYTES / sizeof(uint32_t))
23 struct intel_hw_status_page {
29 #define I915_READ_TAIL(engine) I915_READ(RING_TAIL((engine)->mmio_base))
30 #define I915_WRITE_TAIL(engine, val) I915_WRITE(RING_TAIL((engine)->mmio_base), val)
32 #define I915_READ_START(engine) I915_READ(RING_START((engine)->mmio_base))
33 #define I915_WRITE_START(engine, val) I915_WRITE(RING_START((engine)->mmio_base), val)
35 #define I915_READ_HEAD(engine) I915_READ(RING_HEAD((engine)->mmio_base))
36 #define I915_WRITE_HEAD(engine, val) I915_WRITE(RING_HEAD((engine)->mmio_base), val)
38 #define I915_READ_CTL(engine) I915_READ(RING_CTL((engine)->mmio_base))
39 #define I915_WRITE_CTL(engine, val) I915_WRITE(RING_CTL((engine)->mmio_base), val)
41 #define I915_READ_IMR(engine) I915_READ(RING_IMR((engine)->mmio_base))
42 #define I915_WRITE_IMR(engine, val) I915_WRITE(RING_IMR((engine)->mmio_base), val)
44 #define I915_READ_MODE(engine) I915_READ(RING_MI_MODE((engine)->mmio_base))
45 #define I915_WRITE_MODE(engine, val) I915_WRITE(RING_MI_MODE((engine)->mmio_base), val)
47 /* seqno size is actually only a uint32, but since we plan to use MI_FLUSH_DW to
48 * do the writes, and that must have qw aligned offsets, simply pretend it's 8b.
50 #define gen8_semaphore_seqno_size sizeof(uint64_t)
51 #define GEN8_SEMAPHORE_OFFSET(__from, __to) \
52 (((__from) * I915_NUM_ENGINES + (__to)) * gen8_semaphore_seqno_size)
53 #define GEN8_SIGNAL_OFFSET(__ring, to) \
54 (dev_priv->semaphore->node.start + \
55 GEN8_SEMAPHORE_OFFSET((__ring)->id, (to)))
56 #define GEN8_WAIT_OFFSET(__ring, from) \
57 (dev_priv->semaphore->node.start + \
58 GEN8_SEMAPHORE_OFFSET(from, (__ring)->id))
60 enum intel_engine_hangcheck_action {
65 ENGINE_ACTIVE_SUBUNITS,
70 static inline const char *
71 hangcheck_action_to_str(const enum intel_engine_hangcheck_action a)
78 case ENGINE_ACTIVE_SEQNO:
79 return "active seqno";
80 case ENGINE_ACTIVE_HEAD:
82 case ENGINE_ACTIVE_SUBUNITS:
83 return "active subunits";
84 case ENGINE_WAIT_KICK:
93 #define I915_MAX_SLICES 3
94 #define I915_MAX_SUBSLICES 3
96 #define instdone_slice_mask(dev_priv__) \
97 (INTEL_GEN(dev_priv__) == 7 ? \
98 1 : INTEL_INFO(dev_priv__)->sseu.slice_mask)
100 #define instdone_subslice_mask(dev_priv__) \
101 (INTEL_GEN(dev_priv__) == 7 ? \
102 1 : INTEL_INFO(dev_priv__)->sseu.subslice_mask)
104 #define for_each_instdone_slice_subslice(dev_priv__, slice__, subslice__) \
105 for ((slice__) = 0, (subslice__) = 0; \
106 (slice__) < I915_MAX_SLICES; \
107 (subslice__) = ((subslice__) + 1) < I915_MAX_SUBSLICES ? (subslice__) + 1 : 0, \
108 (slice__) += ((subslice__) == 0)) \
109 for_each_if((BIT(slice__) & instdone_slice_mask(dev_priv__)) && \
110 (BIT(subslice__) & instdone_subslice_mask(dev_priv__)))
112 struct intel_instdone {
114 /* The following exist only in the RCS engine */
116 u32 sampler[I915_MAX_SLICES][I915_MAX_SUBSLICES];
117 u32 row[I915_MAX_SLICES][I915_MAX_SUBSLICES];
120 struct intel_engine_hangcheck {
123 enum intel_engine_hangcheck_action action;
124 unsigned long action_timestamp;
126 struct intel_instdone instdone;
127 struct drm_i915_gem_request *active_request;
132 struct i915_vma *vma;
135 struct list_head request_list;
146 struct i915_gem_context;
147 struct drm_i915_reg_table;
150 * we use a single page to load ctx workarounds so all of these
151 * values are referred in terms of dwords
153 * struct i915_wa_ctx_bb:
154 * offset: specifies batch starting position, also helpful in case
155 * if we want to have multiple batches at different offsets based on
156 * some criteria. It is not a requirement at the moment but provides
157 * an option for future use.
158 * size: size of the batch in DWORDS
160 struct i915_ctx_workarounds {
161 struct i915_wa_ctx_bb {
164 } indirect_ctx, per_ctx;
165 struct i915_vma *vma;
168 struct drm_i915_gem_request;
169 struct intel_render_state;
172 * Engine IDs definitions.
173 * Keep instances of the same type engine together.
175 enum intel_engine_id {
180 #define _VCS(n) (VCS + (n))
184 struct i915_priolist {
186 struct list_head requests;
191 * struct intel_engine_execlists - execlist submission queue and port state
193 * The struct intel_engine_execlists represents the combined logical state of
194 * driver and the hardware state for execlist mode of submission.
196 struct intel_engine_execlists {
198 * @irq_tasklet: softirq tasklet for bottom handler
200 struct tasklet_struct irq_tasklet;
203 * @default_priolist: priority list for I915_PRIORITY_NORMAL
205 struct i915_priolist default_priolist;
208 * @no_priolist: priority lists disabled
213 * @port: execlist port states
215 * For each hardware ELSP (ExecList Submission Port) we keep
216 * track of the last request and the number of times we submitted
217 * that port to hw. We then count the number of times the hw reports
218 * a context completion or preemption. As only one context can
219 * be active on hw, we limit resubmission of context to port[0]. This
220 * is called Lite Restore, of the context.
222 struct execlist_port {
224 * @request_count: combined request and submission count
226 struct drm_i915_gem_request *request_count;
227 #define EXECLIST_COUNT_BITS 2
228 #define port_request(p) ptr_mask_bits((p)->request_count, EXECLIST_COUNT_BITS)
229 #define port_count(p) ptr_unmask_bits((p)->request_count, EXECLIST_COUNT_BITS)
230 #define port_pack(rq, count) ptr_pack_bits(rq, count, EXECLIST_COUNT_BITS)
231 #define port_unpack(p, count) ptr_unpack_bits((p)->request_count, count, EXECLIST_COUNT_BITS)
232 #define port_set(p, packed) ((p)->request_count = (packed))
233 #define port_isset(p) ((p)->request_count)
234 #define port_index(p, execlists) ((p) - (execlists)->port)
237 * @context_id: context ID for port
239 GEM_DEBUG_DECL(u32 context_id);
241 #define EXECLIST_MAX_PORTS 2
242 } port[EXECLIST_MAX_PORTS];
245 * @active: is the HW active? We consider the HW as active after
246 * submitting any context for execution and until we have seen the
247 * last context completion event. After that, we do not expect any
248 * more events until we submit, and so can park the HW.
250 * As we have a small number of different sources from which we feed
251 * the HW, we track the state of each inside a single bitfield.
254 #define EXECLISTS_ACTIVE_USER 0
255 #define EXECLISTS_ACTIVE_PREEMPT 1
258 * @port_mask: number of execlist ports - 1
260 unsigned int port_mask;
263 * @queue: queue of requests, in priority lists
265 struct rb_root queue;
268 * @first: leftmost level in priority @queue
270 struct rb_node *first;
273 * @fw_domains: forcewake domains for irq tasklet
275 unsigned int fw_domains;
278 * @csb_head: context status buffer head
280 unsigned int csb_head;
283 * @csb_use_mmio: access csb through mmio, instead of hwsp
288 #define INTEL_ENGINE_CS_MAX_NAME 8
290 struct intel_engine_cs {
291 struct drm_i915_private *i915;
292 char name[INTEL_ENGINE_CS_MAX_NAME];
293 enum intel_engine_id id;
294 unsigned int uabi_id;
302 unsigned int irq_shift;
304 struct intel_ring *buffer;
305 struct intel_timeline *timeline;
307 struct intel_render_state *render_state;
310 unsigned long irq_posted;
311 #define ENGINE_IRQ_BREADCRUMB 0
312 #define ENGINE_IRQ_EXECLIST 1
314 /* Rather than have every client wait upon all user interrupts,
315 * with the herd waking after every interrupt and each doing the
316 * heavyweight seqno dance, we delegate the task (of being the
317 * bottom-half of the user interrupt) to the first client. After
318 * every interrupt, we wake up one client, who does the heavyweight
319 * coherent seqno read and either goes back to sleep (if incomplete),
320 * or wakes up all the completed clients in parallel, before then
321 * transferring the bottom-half status to the next client in the queue.
323 * Compared to walking the entire list of waiters in a single dedicated
324 * bottom-half, we reduce the latency of the first waiter by avoiding
325 * a context switch, but incur additional coherent seqno reads when
326 * following the chain of request breadcrumbs. Since it is most likely
327 * that we have a single client waiting on each seqno, then reducing
328 * the overhead of waking that client is much preferred.
330 struct intel_breadcrumbs {
331 spinlock_t irq_lock; /* protects irq_*; irqsafe */
332 struct intel_wait *irq_wait; /* oldest waiter by retirement */
334 spinlock_t rb_lock; /* protects the rb and wraps irq_lock */
335 struct rb_root waiters; /* sorted by retirement, priority */
336 struct rb_root signals; /* sorted by retirement */
337 struct task_struct *signaler; /* used for fence signalling */
338 struct drm_i915_gem_request __rcu *first_signal;
339 struct timer_list fake_irq; /* used after a missed interrupt */
340 struct timer_list hangcheck; /* detect missed interrupts */
342 unsigned int hangcheck_interrupts;
345 bool irq_enabled : 1;
346 I915_SELFTEST_DECLARE(bool mock : 1);
350 * A pool of objects to use as shadow copies of client batch buffers
351 * when the command parser is enabled. Prevents the client from
352 * modifying the batch contents after software parsing.
354 struct i915_gem_batch_pool batch_pool;
356 struct intel_hw_status_page status_page;
357 struct i915_ctx_workarounds wa_ctx;
358 struct i915_vma *scratch;
360 u32 irq_keep_mask; /* always keep these interrupts */
361 u32 irq_enable_mask; /* bitmask to enable ring interrupt */
362 void (*irq_enable)(struct intel_engine_cs *engine);
363 void (*irq_disable)(struct intel_engine_cs *engine);
365 int (*init_hw)(struct intel_engine_cs *engine);
366 void (*reset_hw)(struct intel_engine_cs *engine,
367 struct drm_i915_gem_request *req);
369 void (*set_default_submission)(struct intel_engine_cs *engine);
371 struct intel_ring *(*context_pin)(struct intel_engine_cs *engine,
372 struct i915_gem_context *ctx);
373 void (*context_unpin)(struct intel_engine_cs *engine,
374 struct i915_gem_context *ctx);
375 int (*request_alloc)(struct drm_i915_gem_request *req);
376 int (*init_context)(struct drm_i915_gem_request *req);
378 int (*emit_flush)(struct drm_i915_gem_request *request,
380 #define EMIT_INVALIDATE BIT(0)
381 #define EMIT_FLUSH BIT(1)
382 #define EMIT_BARRIER (EMIT_INVALIDATE | EMIT_FLUSH)
383 int (*emit_bb_start)(struct drm_i915_gem_request *req,
384 u64 offset, u32 length,
385 unsigned int dispatch_flags);
386 #define I915_DISPATCH_SECURE BIT(0)
387 #define I915_DISPATCH_PINNED BIT(1)
388 #define I915_DISPATCH_RS BIT(2)
389 void (*emit_breadcrumb)(struct drm_i915_gem_request *req,
391 int emit_breadcrumb_sz;
393 /* Pass the request to the hardware queue (e.g. directly into
394 * the legacy ringbuffer or to the end of an execlist).
396 * This is called from an atomic context with irqs disabled; must
399 void (*submit_request)(struct drm_i915_gem_request *req);
401 /* Call when the priority on a request has changed and it and its
402 * dependencies may need rescheduling. Note the request itself may
403 * not be ready to run!
405 * Called under the struct_mutex.
407 void (*schedule)(struct drm_i915_gem_request *request,
411 * Cancel all requests on the hardware, or queued for execution.
412 * This should only cancel the ready requests that have been
413 * submitted to the engine (via the engine->submit_request callback).
414 * This is called when marking the device as wedged.
416 void (*cancel_requests)(struct intel_engine_cs *engine);
418 /* Some chipsets are not quite as coherent as advertised and need
419 * an expensive kick to force a true read of the up-to-date seqno.
420 * However, the up-to-date seqno is not always required and the last
421 * seen value is good enough. Note that the seqno will always be
422 * monotonic, even if not coherent.
424 void (*irq_seqno_barrier)(struct intel_engine_cs *engine);
425 void (*cleanup)(struct intel_engine_cs *engine);
427 /* GEN8 signal/wait table - never trust comments!
428 * signal to signal to signal to signal to signal to
429 * RCS VCS BCS VECS VCS2
430 * --------------------------------------------------------------------
431 * RCS | NOP (0x00) | VCS (0x08) | BCS (0x10) | VECS (0x18) | VCS2 (0x20) |
432 * |-------------------------------------------------------------------
433 * VCS | RCS (0x28) | NOP (0x30) | BCS (0x38) | VECS (0x40) | VCS2 (0x48) |
434 * |-------------------------------------------------------------------
435 * BCS | RCS (0x50) | VCS (0x58) | NOP (0x60) | VECS (0x68) | VCS2 (0x70) |
436 * |-------------------------------------------------------------------
437 * VECS | RCS (0x78) | VCS (0x80) | BCS (0x88) | NOP (0x90) | VCS2 (0x98) |
438 * |-------------------------------------------------------------------
439 * VCS2 | RCS (0xa0) | VCS (0xa8) | BCS (0xb0) | VECS (0xb8) | NOP (0xc0) |
440 * |-------------------------------------------------------------------
443 * f(x, y) := (x->id * NUM_RINGS * seqno_size) + (seqno_size * y->id)
444 * ie. transpose of g(x, y)
446 * sync from sync from sync from sync from sync from
447 * RCS VCS BCS VECS VCS2
448 * --------------------------------------------------------------------
449 * RCS | NOP (0x00) | VCS (0x28) | BCS (0x50) | VECS (0x78) | VCS2 (0xa0) |
450 * |-------------------------------------------------------------------
451 * VCS | RCS (0x08) | NOP (0x30) | BCS (0x58) | VECS (0x80) | VCS2 (0xa8) |
452 * |-------------------------------------------------------------------
453 * BCS | RCS (0x10) | VCS (0x38) | NOP (0x60) | VECS (0x88) | VCS2 (0xb0) |
454 * |-------------------------------------------------------------------
455 * VECS | RCS (0x18) | VCS (0x40) | BCS (0x68) | NOP (0x90) | VCS2 (0xb8) |
456 * |-------------------------------------------------------------------
457 * VCS2 | RCS (0x20) | VCS (0x48) | BCS (0x70) | VECS (0x98) | NOP (0xc0) |
458 * |-------------------------------------------------------------------
461 * g(x, y) := (y->id * NUM_RINGS * seqno_size) + (seqno_size * x->id)
462 * ie. transpose of f(x, y)
466 #define GEN6_SEMAPHORE_LAST VECS_HW
467 #define GEN6_NUM_SEMAPHORES (GEN6_SEMAPHORE_LAST + 1)
468 #define GEN6_SEMAPHORES_MASK GENMASK(GEN6_SEMAPHORE_LAST, 0)
470 /* our mbox written by others */
471 u32 wait[GEN6_NUM_SEMAPHORES];
472 /* mboxes this ring signals to */
473 i915_reg_t signal[GEN6_NUM_SEMAPHORES];
475 u64 signal_ggtt[I915_NUM_ENGINES];
479 int (*sync_to)(struct drm_i915_gem_request *req,
480 struct drm_i915_gem_request *signal);
481 u32 *(*signal)(struct drm_i915_gem_request *req, u32 *cs);
484 struct intel_engine_execlists execlists;
486 /* Contexts are pinned whilst they are active on the GPU. The last
487 * context executed remains active whilst the GPU is idle - the
488 * switch away and write to the context object only occurs on the
489 * next execution. Contexts are only unpinned on retirement of the
490 * following request ensuring that we can always write to the object
491 * on the context switch even after idling. Across suspend, we switch
492 * to the kernel context and trash it as the save may not happen
493 * before the hardware is powered down.
495 struct i915_gem_context *last_retired_context;
497 /* We track the current MI_SET_CONTEXT in order to eliminate
498 * redudant context switches. This presumes that requests are not
499 * reordered! Or when they are the tracking is updated along with
500 * the emission of individual requests into the legacy command
503 struct i915_gem_context *legacy_active_context;
505 /* status_notifier: list of callbacks for context-switch changes */
506 struct atomic_notifier_head context_status_notifier;
508 struct intel_engine_hangcheck hangcheck;
510 bool needs_cmd_parser;
513 * Table of commands the command parser needs to know about
516 DECLARE_HASHTABLE(cmd_hash, I915_CMD_HASH_ORDER);
519 * Table of registers allowed in commands that read/write registers.
521 const struct drm_i915_reg_table *reg_tables;
525 * Returns the bitmask for the length field of the specified command.
526 * Return 0 for an unrecognized/invalid command.
528 * If the command parser finds an entry for a command in the engine's
529 * cmd_tables, it gets the command's length based on the table entry.
530 * If not, it calls this function to determine the per-engine length
531 * field encoding for the command (i.e. different opcode ranges use
532 * certain bits to encode the command length in the header).
534 u32 (*get_cmd_length_mask)(u32 cmd_header);
538 execlists_set_active(struct intel_engine_execlists *execlists,
541 __set_bit(bit, (unsigned long *)&execlists->active);
545 execlists_clear_active(struct intel_engine_execlists *execlists,
548 __clear_bit(bit, (unsigned long *)&execlists->active);
552 execlists_is_active(const struct intel_engine_execlists *execlists,
555 return test_bit(bit, (unsigned long *)&execlists->active);
558 static inline unsigned int
559 execlists_num_ports(const struct intel_engine_execlists * const execlists)
561 return execlists->port_mask + 1;
565 execlists_port_complete(struct intel_engine_execlists * const execlists,
566 struct execlist_port * const port)
568 const unsigned int m = execlists->port_mask;
570 GEM_BUG_ON(port_index(port, execlists) != 0);
571 GEM_BUG_ON(!execlists_is_active(execlists, EXECLISTS_ACTIVE_USER));
573 memmove(port, port + 1, m * sizeof(struct execlist_port));
574 memset(port + m, 0, sizeof(struct execlist_port));
577 static inline unsigned int
578 intel_engine_flag(const struct intel_engine_cs *engine)
580 return BIT(engine->id);
584 intel_read_status_page(struct intel_engine_cs *engine, int reg)
586 /* Ensure that the compiler doesn't optimize away the load. */
587 return READ_ONCE(engine->status_page.page_addr[reg]);
591 intel_write_status_page(struct intel_engine_cs *engine, int reg, u32 value)
593 /* Writing into the status page should be done sparingly. Since
594 * we do when we are uncertain of the device state, we take a bit
595 * of extra paranoia to try and ensure that the HWS takes the value
596 * we give and that it doesn't end up trapped inside the CPU!
598 if (static_cpu_has(X86_FEATURE_CLFLUSH)) {
600 clflush(&engine->status_page.page_addr[reg]);
601 engine->status_page.page_addr[reg] = value;
602 clflush(&engine->status_page.page_addr[reg]);
605 WRITE_ONCE(engine->status_page.page_addr[reg], value);
610 * Reads a dword out of the status page, which is written to from the command
611 * queue by automatic updates, MI_REPORT_HEAD, MI_STORE_DATA_INDEX, or
614 * The following dwords have a reserved meaning:
615 * 0x00: ISR copy, updated when an ISR bit not set in the HWSTAM changes.
616 * 0x04: ring 0 head pointer
617 * 0x05: ring 1 head pointer (915-class)
618 * 0x06: ring 2 head pointer (915-class)
619 * 0x10-0x1b: Context status DWords (GM45)
620 * 0x1f: Last written status offset. (GM45)
621 * 0x20-0x2f: Reserved (Gen6+)
623 * The area from dword 0x30 to 0x3ff is available for driver usage.
625 #define I915_GEM_HWS_INDEX 0x30
626 #define I915_GEM_HWS_INDEX_ADDR (I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT)
627 #define I915_GEM_HWS_SCRATCH_INDEX 0x40
628 #define I915_GEM_HWS_SCRATCH_ADDR (I915_GEM_HWS_SCRATCH_INDEX << MI_STORE_DWORD_INDEX_SHIFT)
630 #define I915_HWS_CSB_BUF0_INDEX 0x10
631 #define I915_HWS_CSB_WRITE_INDEX 0x1f
632 #define CNL_HWS_CSB_WRITE_INDEX 0x2f
635 intel_engine_create_ring(struct intel_engine_cs *engine, int size);
636 int intel_ring_pin(struct intel_ring *ring,
637 struct drm_i915_private *i915,
638 unsigned int offset_bias);
639 void intel_ring_reset(struct intel_ring *ring, u32 tail);
640 unsigned int intel_ring_update_space(struct intel_ring *ring);
641 void intel_ring_unpin(struct intel_ring *ring);
642 void intel_ring_free(struct intel_ring *ring);
644 void intel_engine_stop(struct intel_engine_cs *engine);
645 void intel_engine_cleanup(struct intel_engine_cs *engine);
647 void intel_legacy_submission_resume(struct drm_i915_private *dev_priv);
649 int __must_check intel_ring_cacheline_align(struct drm_i915_gem_request *req);
651 u32 __must_check *intel_ring_begin(struct drm_i915_gem_request *req,
655 intel_ring_advance(struct drm_i915_gem_request *req, u32 *cs)
659 * This serves as a placeholder in the code so that the reader
660 * can compare against the preceding intel_ring_begin() and
661 * check that the number of dwords emitted matches the space
662 * reserved for the command packet (i.e. the value passed to
663 * intel_ring_begin()).
665 GEM_BUG_ON((req->ring->vaddr + req->ring->emit) != cs);
669 intel_ring_wrap(const struct intel_ring *ring, u32 pos)
671 return pos & (ring->size - 1);
675 intel_ring_offset(const struct drm_i915_gem_request *req, void *addr)
677 /* Don't write ring->size (equivalent to 0) as that hangs some GPUs. */
678 u32 offset = addr - req->ring->vaddr;
679 GEM_BUG_ON(offset > req->ring->size);
680 return intel_ring_wrap(req->ring, offset);
684 assert_ring_tail_valid(const struct intel_ring *ring, unsigned int tail)
686 /* We could combine these into a single tail operation, but keeping
687 * them as seperate tests will help identify the cause should one
690 GEM_BUG_ON(!IS_ALIGNED(tail, 8));
691 GEM_BUG_ON(tail >= ring->size);
695 * Gen2 BSpec "1. Programming Environment" / 1.4.4.6
696 * Gen3 BSpec "1c Memory Interface Functions" / 2.3.4.5
697 * Gen4+ BSpec "1c Memory Interface and Command Stream" / 5.3.4.5
698 * "If the Ring Buffer Head Pointer and the Tail Pointer are on the
699 * same cacheline, the Head Pointer must not be greater than the Tail
702 * We use ring->head as the last known location of the actual RING_HEAD,
703 * it may have advanced but in the worst case it is equally the same
704 * as ring->head and so we should never program RING_TAIL to advance
705 * into the same cacheline as ring->head.
707 #define cacheline(a) round_down(a, CACHELINE_BYTES)
708 GEM_BUG_ON(cacheline(tail) == cacheline(ring->head) &&
713 static inline unsigned int
714 intel_ring_set_tail(struct intel_ring *ring, unsigned int tail)
716 /* Whilst writes to the tail are strictly order, there is no
717 * serialisation between readers and the writers. The tail may be
718 * read by i915_gem_request_retire() just as it is being updated
719 * by execlists, as although the breadcrumb is complete, the context
720 * switch hasn't been seen.
722 assert_ring_tail_valid(ring, tail);
727 void intel_engine_init_global_seqno(struct intel_engine_cs *engine, u32 seqno);
729 void intel_engine_setup_common(struct intel_engine_cs *engine);
730 int intel_engine_init_common(struct intel_engine_cs *engine);
731 int intel_engine_create_scratch(struct intel_engine_cs *engine, int size);
732 void intel_engine_cleanup_common(struct intel_engine_cs *engine);
734 int intel_init_render_ring_buffer(struct intel_engine_cs *engine);
735 int intel_init_bsd_ring_buffer(struct intel_engine_cs *engine);
736 int intel_init_blt_ring_buffer(struct intel_engine_cs *engine);
737 int intel_init_vebox_ring_buffer(struct intel_engine_cs *engine);
739 u64 intel_engine_get_active_head(struct intel_engine_cs *engine);
740 u64 intel_engine_get_last_batch_head(struct intel_engine_cs *engine);
742 static inline u32 intel_engine_get_seqno(struct intel_engine_cs *engine)
744 return intel_read_status_page(engine, I915_GEM_HWS_INDEX);
747 static inline u32 intel_engine_last_submit(struct intel_engine_cs *engine)
749 /* We are only peeking at the tail of the submit queue (and not the
750 * queue itself) in order to gain a hint as to the current active
751 * state of the engine. Callers are not expected to be taking
752 * engine->timeline->lock, nor are they expected to be concerned
753 * wtih serialising this hint with anything, so document it as
754 * a hint and nothing more.
756 return READ_ONCE(engine->timeline->seqno);
759 int init_workarounds_ring(struct intel_engine_cs *engine);
760 int intel_ring_workarounds_emit(struct drm_i915_gem_request *req);
762 void intel_engine_get_instdone(struct intel_engine_cs *engine,
763 struct intel_instdone *instdone);
766 * Arbitrary size for largest possible 'add request' sequence. The code paths
767 * are complex and variable. Empirical measurement shows that the worst case
768 * is BDW at 192 bytes (6 + 6 + 36 dwords), then ILK at 136 bytes. However,
769 * we need to allocate double the largest single packet within that emission
770 * to account for tail wraparound (so 6 + 6 + 72 dwords for BDW).
772 #define MIN_SPACE_FOR_ADD_REQUEST 336
774 static inline u32 intel_hws_seqno_address(struct intel_engine_cs *engine)
776 return engine->status_page.ggtt_offset + I915_GEM_HWS_INDEX_ADDR;
779 /* intel_breadcrumbs.c -- user interrupt bottom-half for waiters */
780 int intel_engine_init_breadcrumbs(struct intel_engine_cs *engine);
782 static inline void intel_wait_init(struct intel_wait *wait,
783 struct drm_i915_gem_request *rq)
789 static inline void intel_wait_init_for_seqno(struct intel_wait *wait, u32 seqno)
795 static inline bool intel_wait_has_seqno(const struct intel_wait *wait)
801 intel_wait_update_seqno(struct intel_wait *wait, u32 seqno)
804 return intel_wait_has_seqno(wait);
808 intel_wait_update_request(struct intel_wait *wait,
809 const struct drm_i915_gem_request *rq)
811 return intel_wait_update_seqno(wait, i915_gem_request_global_seqno(rq));
815 intel_wait_check_seqno(const struct intel_wait *wait, u32 seqno)
817 return wait->seqno == seqno;
821 intel_wait_check_request(const struct intel_wait *wait,
822 const struct drm_i915_gem_request *rq)
824 return intel_wait_check_seqno(wait, i915_gem_request_global_seqno(rq));
827 static inline bool intel_wait_complete(const struct intel_wait *wait)
829 return RB_EMPTY_NODE(&wait->node);
832 bool intel_engine_add_wait(struct intel_engine_cs *engine,
833 struct intel_wait *wait);
834 void intel_engine_remove_wait(struct intel_engine_cs *engine,
835 struct intel_wait *wait);
836 void intel_engine_enable_signaling(struct drm_i915_gem_request *request,
838 void intel_engine_cancel_signaling(struct drm_i915_gem_request *request);
840 static inline bool intel_engine_has_waiter(const struct intel_engine_cs *engine)
842 return READ_ONCE(engine->breadcrumbs.irq_wait);
845 unsigned int intel_engine_wakeup(struct intel_engine_cs *engine);
846 #define ENGINE_WAKEUP_WAITER BIT(0)
847 #define ENGINE_WAKEUP_ASLEEP BIT(1)
849 void __intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine);
850 void intel_engine_disarm_breadcrumbs(struct intel_engine_cs *engine);
852 void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine);
853 void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine);
854 bool intel_breadcrumbs_busy(struct intel_engine_cs *engine);
856 static inline u32 *gen8_emit_pipe_control(u32 *batch, u32 flags, u32 offset)
858 memset(batch, 0, 6 * sizeof(u32));
860 batch[0] = GFX_OP_PIPE_CONTROL(6);
867 bool intel_engine_is_idle(struct intel_engine_cs *engine);
868 bool intel_engines_are_idle(struct drm_i915_private *dev_priv);
870 void intel_engines_mark_idle(struct drm_i915_private *i915);
871 void intel_engines_reset_default_submission(struct drm_i915_private *i915);
873 bool intel_engine_can_store_dword(struct intel_engine_cs *engine);
875 void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *p);
877 #endif /* _INTEL_RINGBUFFER_H_ */