During request construction, after pinning the context we know whether
or not we have to emit a context switch. So move this common operation
from every caller into i915_gem_request_alloc() itself.
v2: Always submit the request if we emitted some commands during request
construction, as typically it also involves changes in global state.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 2 +-
drivers/gpu/drm/i915/i915_gem_context.c | 7 +------
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 8 --------
drivers/gpu/drm/i915/i915_gem_request.c | 18 +++++++++++++-----
drivers/gpu/drm/i915/i915_perf.c | 3 +--
drivers/gpu/drm/i915/intel_ringbuffer.c | 4 ++++
drivers/gpu/drm/i915/selftests/huge_pages.c | 4 ----
drivers/gpu/drm/i915/selftests/i915_gem_context.c | 4 ----
drivers/gpu/drm/i915/selftests/i915_gem_request.c | 10 ----------
drivers/gpu/drm/i915/selftests/intel_hangcheck.c | 4 ----
10 files changed, 20 insertions(+), 44 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 61ba321e9970..e07eb0beef13 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5045,7 +5045,7 @@ static int __intel_engines_record_defaults(struct drm_i915_private *i915)
goto out_ctx;
}
- err = i915_switch_context(rq);
+ err = 0;
if (engine->init_context)
err = engine->init_context(rq);
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 2db040695035..c1efbaf02bf2 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -842,8 +842,7 @@ int i915_switch_context(struct drm_i915_gem_request *req)
struct intel_engine_cs *engine = req->engine;
lockdep_assert_held(&req->i915->drm.struct_mutex);
- if (i915_modparams.enable_execlists)
- return 0;
+ GEM_BUG_ON(i915_modparams.enable_execlists);
if (!req->ctx->engine[engine->id].state) {
struct i915_gem_context *to = req->ctx;
@@ -899,7 +898,6 @@ int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv)
for_each_engine(engine, dev_priv, id) {
struct drm_i915_gem_request *req;
- int ret;
if (engine_has_idle_kernel_context(engine))
continue;
@@ -922,10 +920,7 @@ int i915_gem_switch_to_kernel_context(struct drm_i915_private *dev_priv)
GFP_KERNEL);
}
- ret = i915_switch_context(req);
i915_add_request(req);
- if (ret)
- return ret;
}
return 0;
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 53ccb27bfe91..af49da64ff3a 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1115,10 +1115,6 @@ static int __reloc_gpu_alloc(struct i915_execbuffer *eb,
if (err)
goto err_request;
- err = i915_switch_context(rq);
- if (err)
- goto err_request;
-
err = eb->engine->emit_bb_start(rq,
batch->node.start, PAGE_SIZE,
cache->gen > 5 ? 0 : I915_DISPATCH_SECURE);
@@ -1965,10 +1961,6 @@ static int eb_submit(struct i915_execbuffer *eb)
if (err)
return err;
- err = i915_switch_context(eb->request);
- if (err)
- return err;
-
if (eb->args->flags & I915_EXEC_GEN7_SOL_RESET) {
err = i915_reset_gen7_sol_offsets(eb->request);
if (err)
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index e0d6221022a8..445495f9893c 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -624,6 +624,10 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
if (ret)
goto err_unpin;
+ ret = intel_ring_wait_for_space(ring, MIN_SPACE_FOR_ADD_REQUEST);
+ if (ret)
+ goto err_unreserve;
+
/* Move the oldest request to the slab-cache (if not in use!) */
req = list_first_entry_or_null(&engine->timeline->requests,
typeof(*req), link);
@@ -703,10 +707,6 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
req->reserved_space = MIN_SPACE_FOR_ADD_REQUEST;
GEM_BUG_ON(req->reserved_space < engine->emit_breadcrumb_sz);
- ret = engine->request_alloc(req);
- if (ret)
- goto err_ctx;
-
/* Record the position of the start of the request so that
* should we detect the updated seqno part-way through the
* GPU processing the request, we never over-estimate the
@@ -714,16 +714,24 @@ i915_gem_request_alloc(struct intel_engine_cs *engine,
*/
req->head = req->ring->emit;
+ ret = engine->request_alloc(req);
+ if (ret)
+ goto err_ctx;
+
/* Check that we didn't interrupt ourselves with a new request */
GEM_BUG_ON(req->timeline->seqno != req->fence.seqno);
return req;
err_ctx:
+ if (req->ring->emit != req->head) {
+ __i915_add_request(req, false);
+ return ERR_PTR(ret);
+ }
+
/* Make sure we didn't add ourselves to external state before freeing */
GEM_BUG_ON(!list_empty(&req->active_list));
GEM_BUG_ON(!list_empty(&req->priotree.signalers_list));
GEM_BUG_ON(!list_empty(&req->priotree.waiters_list));
-
kmem_cache_free(dev_priv->requests, req);
err_unreserve:
unreserve_engine(engine);
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 00be015e01df..d8952ff8e6b7 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -1726,10 +1726,9 @@ static int gen8_switch_to_updated_kernel_context(struct drm_i915_private *dev_pr
GFP_KERNEL);
}
- ret = i915_switch_context(req);
i915_add_request(req);
- return ret;
+ return 0;
}
/*
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 12e734b29463..be98868115bf 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1592,6 +1592,10 @@ static int ring_request_alloc(struct drm_i915_gem_request *request)
if (ret)
return ret;
+ ret = i915_switch_context(request);
+ if (ret)
+ return ret;
+
request->reserved_space -= LEGACY_REQUEST_SIZE;
return 0;
}
diff --git a/drivers/gpu/drm/i915/selftests/huge_pages.c b/drivers/gpu/drm/i915/selftests/huge_pages.c
index 01af540b6ef9..eb142bd4c9e1 100644
--- a/drivers/gpu/drm/i915/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/selftests/huge_pages.c
@@ -993,10 +993,6 @@ static int gpu_write(struct i915_vma *vma,
if (err)
goto err_request;
- err = i915_switch_context(rq);
- if (err)
- goto err_request;
-
err = rq->engine->emit_bb_start(rq,
batch->node.start, batch->node.size,
flags);
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/selftests/i915_gem_context.c
index c82780a9d455..664d1b4f8c69 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_context.c
@@ -162,10 +162,6 @@ static int gpu_fill(struct drm_i915_gem_object *obj,
if (err)
goto err_request;
- err = i915_switch_context(rq);
- if (err)
- goto err_request;
-
flags = 0;
if (INTEL_GEN(vm->i915) <= 5)
flags |= I915_DISPATCH_SECURE;
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_request.c b/drivers/gpu/drm/i915/selftests/i915_gem_request.c
index 6bce99050e94..e3871db78beb 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_request.c
@@ -463,10 +463,6 @@ empty_request(struct intel_engine_cs *engine,
if (err)
goto out_request;
- err = i915_switch_context(request);
- if (err)
- goto out_request;
-
err = engine->emit_bb_start(request,
batch->node.start,
batch->node.size,
@@ -678,9 +674,6 @@ static int live_all_engines(void *arg)
err = engine->emit_flush(request[id], EMIT_INVALIDATE);
GEM_BUG_ON(err);
- err = i915_switch_context(request[id]);
- GEM_BUG_ON(err);
-
err = engine->emit_bb_start(request[id],
batch->node.start,
batch->node.size,
@@ -800,9 +793,6 @@ static int live_sequential_engines(void *arg)
err = engine->emit_flush(request[id], EMIT_INVALIDATE);
GEM_BUG_ON(err);
- err = i915_switch_context(request[id]);
- GEM_BUG_ON(err);
-
err = engine->emit_bb_start(request[id],
batch->node.start,
batch->node.size,
diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
index 71ce06680d66..cafe39e2e0f7 100644
--- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
+++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c
@@ -118,10 +118,6 @@ static int emit_recurse_batch(struct hang *h,
if (err)
goto unpin_hws;
- err = i915_switch_context(rq);
- if (err)
- goto unpin_hws;
-
i915_vma_move_to_active(vma, rq, 0);
if (!i915_gem_object_has_active_reference(vma->obj)) {
i915_gem_object_get(vma->obj);
--
2.15.0
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