We no longer need to track the active intel_contexts within each engine,
allowing us to drop a tricky mutex_lock from inside unpin (which may
occur inside fs_reclaim).
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
---
drivers/gpu/drm/i915/gt/intel_context.c | 11 +----------
drivers/gpu/drm/i915/gt/intel_context_types.h | 1 -
drivers/gpu/drm/i915/i915_debugfs.c | 11 +++++++++--
drivers/gpu/drm/i915/i915_gem_context.c | 2 --
drivers/gpu/drm/i915/i915_gem_context_types.h | 1 -
drivers/gpu/drm/i915/selftests/i915_gem_context.c | 1 -
drivers/gpu/drm/i915/selftests/mock_context.c | 1 -
7 files changed, 10 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_context.c
b/drivers/gpu/drm/i915/gt/intel_context.c
index 5e506e648454..1f1761fc6597 100644
--- a/drivers/gpu/drm/i915/gt/intel_context.c
+++ b/drivers/gpu/drm/i915/gt/intel_context.c
@@ -49,7 +49,6 @@ int __intel_context_do_pin(struct intel_context *ce)
return -EINTR;
if (likely(!atomic_read(&ce->pin_count))) {
- struct i915_gem_context *ctx = ce->gem_context;
intel_wakeref_t wakeref;
err = 0;
@@ -58,11 +57,7 @@ int __intel_context_do_pin(struct intel_context *ce)
if (err)
goto err;
- i915_gem_context_get(ctx);
-
- mutex_lock(&ctx->mutex);
- list_add(&ce->active_link, &ctx->active_engines);
- mutex_unlock(&ctx->mutex);
+ i915_gem_context_get(ce->gem_context); /* for ctx->ppgtt */
intel_context_get(ce);
smp_mb__before_atomic(); /* flush pin before it is visible */
@@ -91,10 +86,6 @@ void intel_context_unpin(struct intel_context *ce)
if (likely(atomic_dec_and_test(&ce->pin_count))) {
ce->ops->unpin(ce);
- mutex_lock(&ce->gem_context->mutex);
- list_del(&ce->active_link);
- mutex_unlock(&ce->gem_context->mutex);
-
i915_gem_context_put(ce->gem_context);
intel_context_put(ce);
}
diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h
b/drivers/gpu/drm/i915/gt/intel_context_types.h
index 3579c2708321..d5a7dbd0daee 100644
--- a/drivers/gpu/drm/i915/gt/intel_context_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_context_types.h
@@ -38,7 +38,6 @@ struct intel_context {
struct intel_engine_cs *engine;
struct intel_engine_cs *active;
- struct list_head active_link;
struct list_head signal_link;
struct list_head signals;
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index bc94b778da6f..ffbf5d920429 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -34,6 +34,7 @@
#include "gt/intel_reset.h"
+#include "i915_gem_context.h"
#include "intel_dp.h"
#include "intel_drv.h"
#include "intel_fbc.h"
@@ -397,14 +398,17 @@ static void print_context_stats(struct seq_file *m,
struct i915_gem_context *ctx;
list_for_each_entry(ctx, &i915->contexts.list, link) {
+ struct i915_gem_engines_iter it;
struct intel_context *ce;
- list_for_each_entry(ce, &ctx->active_engines, active_link) {
+ for_each_gem_engine(ce,
+ i915_gem_context_lock_engines(ctx), it) {
if (ce->state)
per_file_stats(0, ce->state->obj, &kstats);
if (ce->ring)
per_file_stats(0, ce->ring->vma->obj, &kstats);
}
+ i915_gem_context_unlock_engines(ctx);
if (!IS_ERR_OR_NULL(ctx->file_priv)) {
struct file_stats stats = { .vm = &ctx->ppgtt->vm, };
@@ -1882,6 +1886,7 @@ static int i915_context_status(struct seq_file *m, void
*unused)
return ret;
list_for_each_entry(ctx, &dev_priv->contexts.list, link) {
+ struct i915_gem_engines_iter it;
struct intel_context *ce;
seq_puts(m, "HW context ");
@@ -1906,7 +1911,8 @@ static int i915_context_status(struct seq_file *m, void
*unused)
seq_putc(m, ctx->remap_slice ? 'R' : 'r');
seq_putc(m, '\n');
- list_for_each_entry(ce, &ctx->active_engines, active_link) {
+ for_each_gem_engine(ce,
+ i915_gem_context_lock_engines(ctx), it) {
seq_printf(m, "%s: ", ce->engine->name);
if (ce->state)
describe_obj(m, ce->state->obj);
@@ -1914,6 +1920,7 @@ static int i915_context_status(struct seq_file *m, void
*unused)
describe_ctx_ring(m, ce->ring);
seq_putc(m, '\n');
}
+ i915_gem_context_unlock_engines(ctx);
seq_putc(m, '\n');
}
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c
b/drivers/gpu/drm/i915/i915_gem_context.c
index 3ea199ca834b..939c17070780 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -289,7 +289,6 @@ static void i915_gem_context_free(struct i915_gem_context
*ctx)
{
lockdep_assert_held(&ctx->i915->drm.struct_mutex);
GEM_BUG_ON(!i915_gem_context_is_closed(ctx));
- GEM_BUG_ON(!list_empty(&ctx->active_engines));
release_hw_id(ctx);
i915_ppgtt_put(ctx->ppgtt);
@@ -416,7 +415,6 @@ __create_context(struct drm_i915_private *dev_priv)
list_add_tail(&ctx->link, &dev_priv->contexts.list);
ctx->i915 = dev_priv;
ctx->sched.priority = I915_USER_PRIORITY(I915_PRIORITY_NORMAL);
- INIT_LIST_HEAD(&ctx->active_engines);
mutex_init(&ctx->mutex);
mutex_init(&ctx->engines_mutex);
diff --git a/drivers/gpu/drm/i915/i915_gem_context_types.h
b/drivers/gpu/drm/i915/i915_gem_context_types.h
index 5f84618cf7db..d5cb4f121aad 100644
--- a/drivers/gpu/drm/i915/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/i915_gem_context_types.h
@@ -165,7 +165,6 @@ struct i915_gem_context {
atomic_t hw_id_pin_count;
struct list_head hw_id_link;
- struct list_head active_engines;
struct mutex mutex;
struct i915_sched_attr sched;
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_context.c
b/drivers/gpu/drm/i915/selftests/i915_gem_context.c
index 7fd224a4ca4c..deedd1898fe5 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_context.c
@@ -1675,7 +1675,6 @@ static int mock_context_barrier(void *arg)
goto out;
}
i915_request_add(rq);
- GEM_BUG_ON(list_empty(&ctx->active_engines));
counter = 0;
context_barrier_inject_fault = BIT(RCS0);
diff --git a/drivers/gpu/drm/i915/selftests/mock_context.c
b/drivers/gpu/drm/i915/selftests/mock_context.c
index 71c750693585..10e67c931ed1 100644
--- a/drivers/gpu/drm/i915/selftests/mock_context.c
+++ b/drivers/gpu/drm/i915/selftests/mock_context.c
@@ -50,7 +50,6 @@ mock_context(struct drm_i915_private *i915,
INIT_RADIX_TREE(&ctx->handles_vma, GFP_KERNEL);
INIT_LIST_HEAD(&ctx->handles_list);
INIT_LIST_HEAD(&ctx->hw_id_link);
- INIT_LIST_HEAD(&ctx->active_engines);
mutex_init(&ctx->mutex);
ret = i915_gem_context_pin_hw_id(ctx);
--
2.20.1
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