Re: [PATCH] drm/i915/selftests: Use request managed wakerefs

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On 20/06/2019 11:24, Chris Wilson wrote:
Since commit 79ffac8599c4 ("drm/i915: Invert the GEM wakeref
hierarchy"), the request creation itself took responsibility for
managing the engine/GT wakerefs and so we can remove the redundant grabs
in our selftests.

References: 79ffac8599c4 ("drm/i915: Invert the GEM wakeref hierarchy")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
  .../drm/i915/gem/selftests/i915_gem_context.c | 35 ++++---------------
  1 file changed, 7 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
index eaa2b16574c7..f2d4e773404a 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
@@ -31,7 +31,6 @@ static int live_nop_switch(void *arg)
  	struct intel_engine_cs *engine;
  	struct i915_gem_context **ctx;
  	enum intel_engine_id id;
-	intel_wakeref_t wakeref;
  	struct igt_live_test t;
  	struct drm_file *file;
  	unsigned long n;
@@ -53,7 +52,6 @@ static int live_nop_switch(void *arg)
  		return PTR_ERR(file);
mutex_lock(&i915->drm.struct_mutex);
-	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
ctx = kcalloc(nctx, sizeof(*ctx), GFP_KERNEL);
  	if (!ctx) {
@@ -152,7 +150,6 @@ static int live_nop_switch(void *arg)
  	}
out_unlock:
-	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
  	mutex_unlock(&i915->drm.struct_mutex);
  	mock_file_free(i915, file);
  	return err;
@@ -507,7 +504,6 @@ static int igt_ctx_exec(void *arg)
  		dw = 0;
  		while (!time_after(jiffies, end_time)) {
  			struct i915_gem_context *ctx;
-			intel_wakeref_t wakeref;
ctx = live_context(i915, file);
  			if (IS_ERR(ctx)) {
@@ -523,8 +519,7 @@ static int igt_ctx_exec(void *arg)
  				}
  			}
- with_intel_runtime_pm(&i915->runtime_pm, wakeref)
-				err = gpu_fill(obj, ctx, engine, dw);
+			err = gpu_fill(obj, ctx, engine, dw);
  			if (err) {
  				pr_err("Failed to fill dword %lu [%lu/%lu] with gpu (%s) in ctx %u [full-ppgtt? %s], err=%d\n",
  				       ndwords, dw, max_dwords(obj),
@@ -623,7 +618,6 @@ static int igt_shared_ctx_exec(void *arg)
  		ncontexts = 0;
  		while (!time_after(jiffies, end_time)) {
  			struct i915_gem_context *ctx;
-			intel_wakeref_t wakeref;
ctx = kernel_context(i915);
  			if (IS_ERR(ctx)) {
@@ -642,9 +636,7 @@ static int igt_shared_ctx_exec(void *arg)
  				}
  			}
- err = 0;
-			with_intel_runtime_pm(&i915->runtime_pm, wakeref)
-				err = gpu_fill(obj, ctx, engine, dw);
+			err = gpu_fill(obj, ctx, engine, dw);
  			if (err) {
  				pr_err("Failed to fill dword %lu [%lu/%lu] with gpu (%s) in ctx %u [full-ppgtt? %s], err=%d\n",
  				       ndwords, dw, max_dwords(obj),
@@ -1030,7 +1022,6 @@ __igt_ctx_sseu(struct drm_i915_private *i915,
  	struct i915_gem_context *ctx;
  	struct intel_context *ce;
  	struct intel_sseu pg_sseu;
-	intel_wakeref_t wakeref;
  	struct drm_file *file;
  	int ret;
@@ -1078,12 +1069,10 @@ __igt_ctx_sseu(struct drm_i915_private *i915,
  		goto out_unlock;
  	}
- wakeref = intel_runtime_pm_get(&i915->runtime_pm);
-
  	ce = i915_gem_context_get_engine(ctx, RCS0);
  	if (IS_ERR(ce)) {
  		ret = PTR_ERR(ce);
-		goto out_rpm;
+		goto out_put;
  	}
ret = intel_context_pin(ce);
@@ -1117,8 +1106,7 @@ __igt_ctx_sseu(struct drm_i915_private *i915,
  	intel_context_unpin(ce);
  out_context:
  	intel_context_put(ce);
-out_rpm:
-	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
+out_put:
  	i915_gem_object_put(obj);
out_unlock:
@@ -1207,8 +1195,6 @@ static int igt_ctx_readonly(void *arg)
  		unsigned int id;
for_each_engine(engine, i915, id) {
-			intel_wakeref_t wakeref;
-
  			if (!intel_engine_can_store_dword(engine))
  				continue;
@@ -1223,9 +1209,7 @@ static int igt_ctx_readonly(void *arg)
  					i915_gem_object_set_readonly(obj);
  			}
- err = 0;
-			with_intel_runtime_pm(&i915->runtime_pm, wakeref)
-				err = gpu_fill(obj, ctx, engine, dw);
+			err = gpu_fill(obj, ctx, engine, dw);
  			if (err) {
  				pr_err("Failed to fill dword %lu [%lu/%lu] with gpu (%s) in ctx %u [full-ppgtt? %s], err=%d\n",
  				       ndwords, dw, max_dwords(obj),
@@ -1488,7 +1472,6 @@ static int igt_vm_isolation(void *arg)
  	struct drm_i915_private *i915 = arg;
  	struct i915_gem_context *ctx_a, *ctx_b;
  	struct intel_engine_cs *engine;
-	intel_wakeref_t wakeref;
  	struct igt_live_test t;
  	struct drm_file *file;
  	I915_RND_STATE(prng);
@@ -1535,8 +1518,6 @@ static int igt_vm_isolation(void *arg)
  	GEM_BUG_ON(ctx_b->vm->total != vm_total);
  	vm_total -= I915_GTT_PAGE_SIZE;
- wakeref = intel_runtime_pm_get(&i915->runtime_pm);
-
  	count = 0;
  	for_each_engine(engine, i915, id) {
  		IGT_TIMEOUT(end_time);
@@ -1560,7 +1541,7 @@ static int igt_vm_isolation(void *arg)
  				err = read_from_scratch(ctx_b, engine,
  							offset, &value);
  			if (err)
-				goto out_rpm;
+				goto out_unlock;
if (value) {
  				pr_err("%s: Read %08x from scratch (offset 0x%08x_%08x), after %lu reads!\n",
@@ -1569,7 +1550,7 @@ static int igt_vm_isolation(void *arg)
  				       lower_32_bits(offset),
  				       this);
  				err = -EINVAL;
-				goto out_rpm;
+				goto out_unlock;
  			}
this++;
@@ -1579,8 +1560,6 @@ static int igt_vm_isolation(void *arg)
  	pr_info("Checked %lu scratch offsets across %d engines\n",
  		count, RUNTIME_INFO(i915)->num_engines);
-out_rpm:
-	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
  out_unlock:
  	if (igt_live_test_end(&t))
  		err = -EIO;


Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Regards,

Tvrtko
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