[PATCH 02/33] drm/i915: Stop storing the ring size in the ring pointer (v2)
Jason Ekstrand
jason at jlekstrand.net
Thu Jun 3 16:40:35 UTC 2021
Previously, we were storing the ring size in the ring pointer before it
was actually allocated. We would then guard setting the ring size on
checking for CONTEXT_ALLOC_BIT. This is error-prone at best and really
only saves us a few bytes on something that already burns at least 4K.
Instead, this patch adds a new ring_size field and makes everything use
that.
v2 (Daniel Vetter):
- Replace 512 * SZ_4K with SZ_2M
Signed-off-by: Jason Ekstrand <jason at jlekstrand.net>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 3 +--
drivers/gpu/drm/i915/gt/intel_context.c | 3 ++-
drivers/gpu/drm/i915/gt/intel_context.h | 5 -----
drivers/gpu/drm/i915/gt/intel_context_types.h | 1 +
drivers/gpu/drm/i915/gt/intel_lrc.c | 2 +-
drivers/gpu/drm/i915/gt/selftest_execlists.c | 2 +-
drivers/gpu/drm/i915/gt/selftest_mocs.c | 2 +-
drivers/gpu/drm/i915/gt/selftest_timeline.c | 2 +-
drivers/gpu/drm/i915/gvt/scheduler.c | 7 ++-----
9 files changed, 10 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 650364a0dae28..ec999b7ca50f4 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -211,8 +211,7 @@ static void intel_context_set_gem(struct intel_context *ce,
GEM_BUG_ON(rcu_access_pointer(ce->gem_context));
RCU_INIT_POINTER(ce->gem_context, ctx);
- if (!test_bit(CONTEXT_ALLOC_BIT, &ce->flags))
- ce->ring = __intel_context_ring_size(SZ_16K);
+ ce->ring_size = SZ_16K;
if (rcu_access_pointer(ctx->vm)) {
struct i915_address_space *vm;
diff --git a/drivers/gpu/drm/i915/gt/intel_context.c b/drivers/gpu/drm/i915/gt/intel_context.c
index 4033184f13b9f..bd63813c8a802 100644
--- a/drivers/gpu/drm/i915/gt/intel_context.c
+++ b/drivers/gpu/drm/i915/gt/intel_context.c
@@ -371,7 +371,8 @@ intel_context_init(struct intel_context *ce, struct intel_engine_cs *engine)
ce->engine = engine;
ce->ops = engine->cops;
ce->sseu = engine->sseu;
- ce->ring = __intel_context_ring_size(SZ_4K);
+ ce->ring = NULL;
+ ce->ring_size = SZ_4K;
ewma_runtime_init(&ce->runtime.avg);
diff --git a/drivers/gpu/drm/i915/gt/intel_context.h b/drivers/gpu/drm/i915/gt/intel_context.h
index f83a73a2b39fc..b10cbe8fee992 100644
--- a/drivers/gpu/drm/i915/gt/intel_context.h
+++ b/drivers/gpu/drm/i915/gt/intel_context.h
@@ -175,11 +175,6 @@ int intel_context_prepare_remote_request(struct intel_context *ce,
struct i915_request *intel_context_create_request(struct intel_context *ce);
-static inline struct intel_ring *__intel_context_ring_size(u64 sz)
-{
- return u64_to_ptr(struct intel_ring, sz);
-}
-
static inline bool intel_context_is_barrier(const struct intel_context *ce)
{
return test_bit(CONTEXT_BARRIER_BIT, &ce->flags);
diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h
index ed8c447a7346b..90026c1771055 100644
--- a/drivers/gpu/drm/i915/gt/intel_context_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_context_types.h
@@ -82,6 +82,7 @@ struct intel_context {
spinlock_t signal_lock; /* protects signals, the list of requests */
struct i915_vma *state;
+ u32 ring_size;
struct intel_ring *ring;
struct intel_timeline *timeline;
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index aafe2a4df4960..890b43b296a90 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -845,7 +845,7 @@ int lrc_alloc(struct intel_context *ce, struct intel_engine_cs *engine)
if (IS_ERR(vma))
return PTR_ERR(vma);
- ring = intel_engine_create_ring(engine, (unsigned long)ce->ring);
+ ring = intel_engine_create_ring(engine, ce->ring_size);
if (IS_ERR(ring)) {
err = PTR_ERR(ring);
goto err_vma;
diff --git a/drivers/gpu/drm/i915/gt/selftest_execlists.c b/drivers/gpu/drm/i915/gt/selftest_execlists.c
index 1f93591a8c69e..e78f2bd48bac8 100644
--- a/drivers/gpu/drm/i915/gt/selftest_execlists.c
+++ b/drivers/gpu/drm/i915/gt/selftest_execlists.c
@@ -2793,7 +2793,7 @@ static int __live_preempt_ring(struct intel_engine_cs *engine,
goto err_ce;
}
- tmp->ring = __intel_context_ring_size(ring_sz);
+ tmp->ring_size = ring_sz;
err = intel_context_pin(tmp);
if (err) {
diff --git a/drivers/gpu/drm/i915/gt/selftest_mocs.c b/drivers/gpu/drm/i915/gt/selftest_mocs.c
index e55a887d11e2b..f343fa5fd986f 100644
--- a/drivers/gpu/drm/i915/gt/selftest_mocs.c
+++ b/drivers/gpu/drm/i915/gt/selftest_mocs.c
@@ -28,7 +28,7 @@ static struct intel_context *mocs_context_create(struct intel_engine_cs *engine)
return ce;
/* We build large requests to read the registers from the ring */
- ce->ring = __intel_context_ring_size(SZ_16K);
+ ce->ring_size = SZ_16K;
return ce;
}
diff --git a/drivers/gpu/drm/i915/gt/selftest_timeline.c b/drivers/gpu/drm/i915/gt/selftest_timeline.c
index 9adbd9d147bea..7eedecfb86e59 100644
--- a/drivers/gpu/drm/i915/gt/selftest_timeline.c
+++ b/drivers/gpu/drm/i915/gt/selftest_timeline.c
@@ -874,7 +874,7 @@ static int create_watcher(struct hwsp_watcher *w,
if (IS_ERR(ce))
return PTR_ERR(ce);
- ce->ring = __intel_context_ring_size(ringsz);
+ ce->ring_size = ringsz;
w->rq = intel_context_create_request(ce);
intel_context_put(ce);
if (IS_ERR(w->rq))
diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c
index fc735692f21fb..422cbe0d579d2 100644
--- a/drivers/gpu/drm/i915/gvt/scheduler.c
+++ b/drivers/gpu/drm/i915/gvt/scheduler.c
@@ -1409,11 +1409,8 @@ int intel_vgpu_setup_submission(struct intel_vgpu *vgpu)
intel_context_set_single_submission(ce);
/* Max ring buffer size */
- if (!intel_uc_wants_guc_submission(&engine->gt->uc)) {
- const unsigned int ring_size = 512 * SZ_4K;
-
- ce->ring = __intel_context_ring_size(ring_size);
- }
+ if (!intel_uc_wants_guc_submission(&engine->gt->uc))
+ ce->ring_size = SZ_2M;
s->shadow[i] = ce;
}
--
2.31.1
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