[PATCH 16/33] drm/i915: Enable multiple timelines
Chris Wilson
chris at chris-wilson.co.uk
Fri Sep 16 12:38:28 UTC 2016
With the infrastructure converted over to tracking multiple timelines in
the GEM API whilst preserving the efficiency of using a single execution
timeline internally, we can now assign a separate timeline to every
context with full-ppgtt.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_drv.h | 10 ++++
drivers/gpu/drm/i915/i915_gem.c | 5 ++
drivers/gpu/drm/i915/i915_gem_context.c | 4 +-
drivers/gpu/drm/i915/i915_gem_evict.c | 11 +++--
drivers/gpu/drm/i915/i915_gem_gtt.c | 19 ++++---
drivers/gpu/drm/i915/i915_gem_gtt.h | 4 +-
drivers/gpu/drm/i915/i915_gem_request.c | 85 +++++++++++++++++++-------------
drivers/gpu/drm/i915/i915_gem_timeline.c | 1 +
drivers/gpu/drm/i915/i915_gem_timeline.h | 2 +
drivers/gpu/drm/i915/intel_breadcrumbs.c | 12 +++--
drivers/gpu/drm/i915/intel_ringbuffer.h | 5 --
11 files changed, 101 insertions(+), 57 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 2e13e5a6d0bd..f0c5c08ca34e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3404,6 +3404,16 @@ static inline void i915_gem_context_put(struct i915_gem_context *ctx)
kref_put(&ctx->ref, i915_gem_context_free);
}
+static inline struct intel_timeline *
+i915_gem_context_lookup_timeline(struct i915_gem_context *ctx,
+ struct intel_engine_cs *engine)
+{
+ struct i915_address_space *vm;
+
+ vm = ctx->ppgtt ? &ctx->ppgtt->base : &ctx->i915->ggtt.base;
+ return &vm->timeline.engine[engine->id];
+}
+
static inline bool i915_gem_context_is_default(const struct i915_gem_context *c)
{
return c->user_handle == DEFAULT_CONTEXT_HANDLE;
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 42007dd10688..769478a835e5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2634,6 +2634,7 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
{
struct drm_i915_gem_request *request;
struct i915_gem_context *incomplete_ctx;
+ struct intel_timeline *timeline;
bool ring_hung;
/* Ensure irq handler finishes, and not run again. */
@@ -2671,6 +2672,10 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
list_for_each_entry_continue(request, &engine->timeline->requests, link)
if (request->ctx == incomplete_ctx)
reset_request(request);
+
+ timeline = i915_gem_context_lookup_timeline(incomplete_ctx, engine);
+ list_for_each_entry(request, &timeline->requests, link)
+ reset_request(request);
}
void i915_gem_reset(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index edcfebd3c6ef..d76456fd712e 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -365,9 +365,9 @@ i915_gem_create_context(struct drm_device *dev,
return ctx;
if (USES_FULL_PPGTT(dev)) {
- struct i915_hw_ppgtt *ppgtt =
- i915_ppgtt_create(to_i915(dev), file_priv);
+ struct i915_hw_ppgtt *ppgtt;
+ ppgtt = i915_ppgtt_create(to_i915(dev), file_priv, ctx->name);
if (IS_ERR(ppgtt)) {
DRM_DEBUG_DRIVER("PPGTT setup failed (%ld)\n",
PTR_ERR(ppgtt));
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 5b6f81c1dbca..aadbf1f83351 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -33,13 +33,16 @@
#include "intel_drv.h"
#include "i915_trace.h"
-static bool
-gpu_is_idle(struct drm_i915_private *dev_priv)
+static bool ggtt_is_idle(struct drm_i915_private *dev_priv)
{
+ struct i915_ggtt *ggtt = &dev_priv->ggtt;
struct intel_engine_cs *engine;
for_each_engine(engine, dev_priv) {
- if (intel_engine_is_active(engine))
+ struct intel_timeline *tl;
+
+ tl = &ggtt->base.timeline.engine[engine->id];
+ if (i915_gem_active_isset(&tl->last_request))
return false;
}
@@ -152,7 +155,7 @@ search_again:
if (!i915_is_ggtt(vm) || flags & PIN_NONBLOCK)
return -ENOSPC;
- if (gpu_is_idle(dev_priv)) {
+ if (ggtt_is_idle(dev_priv)) {
/* If we still have pending pageflip completions, drop
* back to userspace to give our workqueues time to
* acquire our locks and unpin the old scanouts.
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 92b36ab79771..6fca32a73770 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2112,8 +2112,10 @@ static int __hw_ppgtt_init(struct i915_hw_ppgtt *ppgtt,
}
static void i915_address_space_init(struct i915_address_space *vm,
- struct drm_i915_private *dev_priv)
+ struct drm_i915_private *dev_priv,
+ const char *name)
{
+ i915_gem_timeline_init(dev_priv, &vm->timeline, name);
drm_mm_init(&vm->mm, vm->start, vm->total);
INIT_LIST_HEAD(&vm->active_list);
INIT_LIST_HEAD(&vm->inactive_list);
@@ -2142,14 +2144,15 @@ static void gtt_write_workarounds(struct drm_device *dev)
static int i915_ppgtt_init(struct i915_hw_ppgtt *ppgtt,
struct drm_i915_private *dev_priv,
- struct drm_i915_file_private *file_priv)
+ struct drm_i915_file_private *file_priv,
+ const char *name)
{
int ret;
ret = __hw_ppgtt_init(ppgtt, dev_priv);
if (ret == 0) {
kref_init(&ppgtt->ref);
- i915_address_space_init(&ppgtt->base, dev_priv);
+ i915_address_space_init(&ppgtt->base, dev_priv, name);
ppgtt->base.file = file_priv;
}
@@ -2183,7 +2186,8 @@ int i915_ppgtt_init_hw(struct drm_device *dev)
struct i915_hw_ppgtt *
i915_ppgtt_create(struct drm_i915_private *dev_priv,
- struct drm_i915_file_private *fpriv)
+ struct drm_i915_file_private *fpriv,
+ const char *name)
{
struct i915_hw_ppgtt *ppgtt;
int ret;
@@ -2192,7 +2196,7 @@ i915_ppgtt_create(struct drm_i915_private *dev_priv,
if (!ppgtt)
return ERR_PTR(-ENOMEM);
- ret = i915_ppgtt_init(ppgtt, dev_priv, fpriv);
+ ret = i915_ppgtt_init(ppgtt, dev_priv, fpriv, name);
if (ret) {
kfree(ppgtt);
return ERR_PTR(ret);
@@ -2215,6 +2219,7 @@ void i915_ppgtt_release(struct kref *kref)
WARN_ON(!list_empty(&ppgtt->base.inactive_list));
WARN_ON(!list_empty(&ppgtt->base.unbound_list));
+ i915_gem_timeline_fini(&ppgtt->base.timeline);
list_del(&ppgtt->base.global_link);
drm_mm_takedown(&ppgtt->base.mm);
@@ -3191,11 +3196,13 @@ int i915_ggtt_init_hw(struct drm_i915_private *dev_priv)
/* Subtract the guard page before address space initialization to
* shrink the range used by drm_mm.
*/
+ mutex_lock(&dev_priv->drm.struct_mutex);
ggtt->base.total -= PAGE_SIZE;
- i915_address_space_init(&ggtt->base, dev_priv);
+ i915_address_space_init(&ggtt->base, dev_priv, "[global]");
ggtt->base.total += PAGE_SIZE;
if (!HAS_LLC(dev_priv))
ggtt->base.mm.color_adjust = i915_gtt_color_adjust;
+ mutex_unlock(&dev_priv->drm.struct_mutex);
if (!io_mapping_init_wc(&dev_priv->ggtt.mappable,
dev_priv->ggtt.mappable_base,
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
index 21f5d9657271..1b2e633f22a3 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.h
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
@@ -342,6 +342,7 @@ struct i915_pml4 {
struct i915_address_space {
struct drm_mm mm;
+ struct i915_gem_timeline timeline;
struct drm_device *dev;
/* Every address space belongs to a struct file - except for the global
* GTT that is owned by the driver (and so @file is set to NULL). In
@@ -612,7 +613,8 @@ void i915_ggtt_cleanup_hw(struct drm_i915_private *dev_priv);
int i915_ppgtt_init_hw(struct drm_device *dev);
void i915_ppgtt_release(struct kref *kref);
struct i915_hw_ppgtt *i915_ppgtt_create(struct drm_i915_private *dev_priv,
- struct drm_i915_file_private *fpriv);
+ struct drm_i915_file_private *fpriv,
+ const char *name);
static inline void i915_ppgtt_get(struct i915_hw_ppgtt *ppgtt)
{
if (ppgtt)
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 198e72da59be..52d1c793a933 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -34,12 +34,6 @@ static const char *i915_fence_get_driver_name(struct fence *fence)
static const char *i915_fence_get_timeline_name(struct fence *fence)
{
- /* Timelines are bound by eviction to a VM. However, since
- * we only have a global seqno at the moment, we only have
- * a single timeline. Note that each timeline will have
- * multiple execution contexts (fence contexts) as we allow
- * engines within a single timeline to execute in parallel.
- */
return to_request(fence)->timeline->common->name;
}
@@ -64,18 +58,6 @@ static signed long i915_fence_wait(struct fence *fence,
return i915_wait_request(to_request(fence), interruptible, timeout);
}
-static void i915_fence_value_str(struct fence *fence, char *str, int size)
-{
- snprintf(str, size, "%u", fence->seqno);
-}
-
-static void i915_fence_timeline_value_str(struct fence *fence, char *str,
- int size)
-{
- snprintf(str, size, "%u",
- intel_engine_get_seqno(to_request(fence)->engine));
-}
-
static void i915_fence_release(struct fence *fence)
{
struct drm_i915_gem_request *req = to_request(fence);
@@ -90,8 +72,6 @@ const struct fence_ops i915_fence_ops = {
.signaled = i915_fence_signaled,
.wait = i915_fence_wait,
.release = i915_fence_release,
- .fence_value_str = i915_fence_value_str,
- .timeline_value_str = i915_fence_timeline_value_str,
};
int i915_gem_request_add_to_client(struct drm_i915_gem_request *req,
@@ -144,7 +124,10 @@ static void i915_gem_request_retire(struct drm_i915_gem_request *request)
struct i915_gem_active *active, *next;
trace_i915_gem_request_retire(request);
+
+ spin_lock_irq(&request->engine->timeline->lock);
list_del_init(&request->link);
+ spin_unlock_irq(&request->engine->timeline->lock);
/* We know the GPU must have read the request to have
* sent us the seqno + interrupt, so use the position
@@ -307,6 +290,12 @@ static int reserve_global_seqno(struct drm_i915_private *i915)
return 0;
}
+static u32 __timeline_get_seqno(struct i915_gem_timeline *tl)
+{
+ /* next_seqno only incremented under a mutex */
+ return tl->next_seqno.counter++;
+}
+
static u32 timeline_get_seqno(struct i915_gem_timeline *tl)
{
return atomic_inc_return(&tl->next_seqno);
@@ -317,17 +306,42 @@ submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
{
struct drm_i915_gem_request *request =
container_of(fence, typeof(*request), submit);
+ struct intel_timeline *timeline;
+ struct intel_engine_cs *engine = request->engine;
+ unsigned long flags;
+ u32 seqno;
/* Will be called from irq-context when using foreign DMA fences */
- switch (state) {
- case FENCE_COMPLETE:
- request->engine->submit_request(request);
- break;
+ if (state != FENCE_COMPLETE)
+ return NOTIFY_DONE;
- case FENCE_FREE:
- break;
- }
+ timeline = engine->timeline;
+ GEM_BUG_ON(timeline == request->timeline);
+
+ spin_lock_irqsave(&timeline->lock, flags);
+
+ seqno = timeline_get_seqno(timeline->common);
+ GEM_BUG_ON(seqno == 0);
+
+ request->previous_seqno = timeline->last_submitted_seqno;
+ timeline->last_submitted_seqno = seqno;
+
+ spin_lock_nested(&request->lock, SINGLE_DEPTH_NESTING);
+ request->global_seqno = seqno;
+ if (test_bit(FENCE_FLAG_ENABLE_SIGNAL_BIT, &request->fence.flags))
+ intel_engine_enable_signaling(request);
+ spin_unlock(&request->lock);
+
+ engine->emit_request(request, request->ring->vaddr + request->postfix);
+
+ spin_lock_nested(&request->timeline->lock, SINGLE_DEPTH_NESTING);
+ list_move_tail(&request->link, &timeline->requests);
+ spin_unlock(&request->timeline->lock);
+
+ engine->submit_request(request);
+
+ spin_unlock_irqrestore(&timeline->lock, flags);
return NOTIFY_DONE;
}
@@ -404,24 +418,24 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
goto err_unreserve;
}
- req->timeline = engine->timeline;
+ req->timeline = i915_gem_context_lookup_timeline(ctx, engine);
spin_lock_init(&req->lock);
fence_init(&req->fence,
&i915_fence_ops,
&req->lock,
req->timeline->fence_context,
- timeline_get_seqno(req->timeline->common));
+ __timeline_get_seqno(req->timeline->common));
i915_sw_fence_init(&req->submit, submit_notify);
INIT_LIST_HEAD(&req->active_list);
req->i915 = dev_priv;
req->engine = engine;
- req->global_seqno = req->fence.seqno;
req->ctx = i915_gem_context_get(ctx);
/* No zalloc, must clear what we need by hand */
+ req->global_seqno = 0;
req->previous_context = NULL;
req->file_priv = NULL;
req->batch = NULL;
@@ -671,8 +685,6 @@ void __i915_add_request(struct drm_i915_gem_request *request, bool flush_caches)
err = intel_ring_begin(request, engine->emit_request_sz);
GEM_BUG_ON(err);
request->postfix = ring->tail;
-
- engine->emit_request(request, request->ring->vaddr + request->postfix);
ring->tail += engine->emit_request_sz * sizeof(u32);
/* Seal the request and mark it as pending execution. Note that
@@ -687,12 +699,15 @@ void __i915_add_request(struct drm_i915_gem_request *request, bool flush_caches)
i915_sw_fence_await_sw_fence(&request->submit, &prev->submit,
&request->submitq, GFP_NOWAIT);
- request->emitted_jiffies = jiffies;
- request->previous_seqno = timeline->last_submitted_seqno;
+ spin_lock_irq(&timeline->lock);
+ list_add_tail(&request->link, &timeline->requests);
+ spin_unlock_irq(&timeline->lock);
+
timeline->last_submitted_seqno = request->fence.seqno;
i915_gem_active_set(&timeline->last_request, request);
- list_add_tail(&request->link, &timeline->requests);
+
list_add_tail(&request->ring_link, &ring->request_list);
+ request->emitted_jiffies = jiffies;
i915_gem_mark_busy(engine);
diff --git a/drivers/gpu/drm/i915/i915_gem_timeline.c b/drivers/gpu/drm/i915/i915_gem_timeline.c
index a4579c109066..40d9f009673f 100644
--- a/drivers/gpu/drm/i915/i915_gem_timeline.c
+++ b/drivers/gpu/drm/i915/i915_gem_timeline.c
@@ -48,6 +48,7 @@ int i915_gem_timeline_init(struct drm_i915_private *i915,
tl->fence_context = fences++;
tl->common = timeline;
+ spin_lock_init(&tl->lock);
init_request_active(&tl->last_request, NULL);
INIT_LIST_HEAD(&tl->requests);
}
diff --git a/drivers/gpu/drm/i915/i915_gem_timeline.h b/drivers/gpu/drm/i915/i915_gem_timeline.h
index 0fbcf8a37076..0302be2dfa13 100644
--- a/drivers/gpu/drm/i915/i915_gem_timeline.h
+++ b/drivers/gpu/drm/i915/i915_gem_timeline.h
@@ -35,6 +35,8 @@ struct intel_timeline {
u64 fence_context;
u32 last_submitted_seqno;
+ spinlock_t lock;
+
/**
* List of breadcrumbs associated with GPU requests currently
* outstanding.
diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index 9ad1028681cf..9dba4971fb1e 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -77,22 +77,26 @@ static void intel_breadcrumbs_fake_irq(unsigned long data)
static void irq_enable(struct intel_engine_cs *engine)
{
+ unsigned long flags;
+
/* Enabling the IRQ may miss the generation of the interrupt, but
* we still need to force the barrier before reading the seqno,
* just in case.
*/
engine->breadcrumbs.irq_posted = true;
- spin_lock_irq(&engine->i915->irq_lock);
+ spin_lock_irqsave(&engine->i915->irq_lock, flags);
engine->irq_enable(engine);
- spin_unlock_irq(&engine->i915->irq_lock);
+ spin_unlock_irqrestore(&engine->i915->irq_lock, flags);
}
static void irq_disable(struct intel_engine_cs *engine)
{
- spin_lock_irq(&engine->i915->irq_lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&engine->i915->irq_lock, flags);
engine->irq_disable(engine);
- spin_unlock_irq(&engine->i915->irq_lock);
+ spin_unlock_irqrestore(&engine->i915->irq_lock, flags);
engine->breadcrumbs.irq_posted = false;
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 7114ef149343..f6637568bad4 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -561,9 +561,4 @@ void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine);
unsigned int intel_kick_waiters(struct drm_i915_private *i915);
unsigned int intel_kick_signalers(struct drm_i915_private *i915);
-static inline bool intel_engine_is_active(struct intel_engine_cs *engine)
-{
- return i915_gem_active_isset(&engine->timeline->last_request);
-}
-
#endif /* _INTEL_RINGBUFFER_H_ */
--
2.9.3
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