If we lack a mappable aperture, opt for nuking stolen memory with the
blitter engine.
Signed-off-by: Matthew Auld <matthew.a...@intel.com>
---
drivers/gpu/drm/i915/selftests/i915_gem.c | 95 +++++++++++++++++++----
1 file changed, 80 insertions(+), 15 deletions(-)
diff --git a/drivers/gpu/drm/i915/selftests/i915_gem.c
b/drivers/gpu/drm/i915/selftests/i915_gem.c
index 37593831b539..c4d7599af4f7 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem.c
@@ -6,6 +6,8 @@
#include <linux/random.h>
+#include "gem/i915_gem_region.h"
+#include "gem/i915_gem_object_blt.h"
#include "gem/selftests/igt_gem_utils.h"
#include "gem/selftests/mock_context.h"
#include "gt/intel_gt.h"
@@ -34,14 +36,25 @@ static int switch_to_context(struct drm_i915_private *i915,
return 0;
}
-static void trash_stolen(struct drm_i915_private *i915)
+static void trash_stolen_cpu(struct drm_i915_private *i915)
{
struct i915_ggtt *ggtt = &i915->ggtt;
const u64 slot = ggtt->error_capture.start;
const resource_size_t size = resource_size(&i915->dsm);
+ intel_wakeref_t wakeref;
unsigned long page;
u32 prng = 0x12345678;
+ /*
+ * As a final sting in the tail, invalidate stolen. Under a real S4,
+ * stolen is lost and needs to be refilled on resume. However, under
+ * CI we merely do S4-device testing (as full S4 is too unreliable
+ * for automated testing across a cluster), so to simulate the effect
+ * of stolen being trashed across S4, we trash it ourselves.
+ */
+
+ wakeref = intel_runtime_pm_get(&i915->runtime_pm);
+
for (page = 0; page < size; page += PAGE_SIZE) {
const dma_addr_t dma = i915->dsm.start + page;
u32 __iomem *s;
@@ -58,24 +71,53 @@ static void trash_stolen(struct drm_i915_private *i915)
}
ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
+
+ intel_runtime_pm_put(&i915->runtime_pm, wakeref);
}
-static void simulate_hibernate(struct drm_i915_private *i915)
+static int trash_stolen_gpu(struct i915_gem_context *ctx)
{
- intel_wakeref_t wakeref;
+ struct drm_i915_private *i915 = ctx->vm->i915;
+ const resource_size_t size = resource_size(&i915->dsm);
+ struct intel_memory_region *clone;
+ struct drm_i915_gem_object *obj;
+ struct intel_context *ce;
+ u32 prng = 0x12345678;
+ int err;
- wakeref = intel_runtime_pm_get(&i915->runtime_pm);
+ if (!HAS_ENGINE(i915, BCS0))
+ return 0;
- /*
- * As a final sting in the tail, invalidate stolen. Under a real S4,
- * stolen is lost and needs to be refilled on resume. However, under
- * CI we merely do S4-device testing (as full S4 is too unreliable
- * for automated testing across a cluster), so to simulate the effect
- * of stolen being trashed across S4, we trash it ourselves.
- */
- trash_stolen(i915);
+ if (!size)
+ return 0;
- intel_runtime_pm_put(&i915->runtime_pm, wakeref);
+ clone = mock_region_create(i915, i915->dsm.start, size, PAGE_SIZE, 0);
+ if (IS_ERR(clone))
+ return PTR_ERR(clone);
+
+ obj = i915_gem_object_create_region(clone, size, 0);
+ if (IS_ERR(obj)) {
+ err = PTR_ERR(obj);
+ goto out_region;
+ }
+
+ ce = i915_gem_context_get_engine(ctx, BCS0);
+ if (IS_ERR(ce)) {
+ err = PTR_ERR(ce);
+ goto out_put;
+ }
+
+ mutex_lock(&i915->drm.struct_mutex);
+ err = i915_gem_object_fill_blt(obj, ce, prng);
+ mutex_unlock(&i915->drm.struct_mutex);
+
+ intel_context_put(ce);
+out_put:
+ i915_gem_object_put(obj);
+out_region:
+ intel_memory_region_put(clone);
+
+ return err;
}
static int pm_prepare(struct drm_i915_private *i915)
@@ -148,6 +190,21 @@ static int igt_gem_suspend(void *arg)
if (err)
goto out;
+ /*
+ * If we lack the mappable aperture we can't really access stolen from
+ * the cpu, but we can always trash it from the gpu, we just need to do
+ * so early, before we start suspending stuff. We shouldn't see any
+ * hangs doing this so early, since things like ring state won't be
+ * allocated in stolen if we can't access it from the cpu. Although if
+ * that's the case maybe there is not much point in bothering with this
+ * anyway...
+ */
+ if (!HAS_MAPPABLE_APERTURE(i915)) {
+ err = trash_stolen_gpu(ctx);
+ if (err)
+ goto out;
+ }
+
err = pm_prepare(i915);
if (err)
goto out;
@@ -155,7 +212,8 @@ static int igt_gem_suspend(void *arg)
pm_suspend(i915);
/* Here be dragons! Note that with S3RST any S3 may become S4! */
- simulate_hibernate(i915);
+ if (HAS_MAPPABLE_APERTURE(i915))
+ trash_stolen_cpu(i915);
pm_resume(i915);
@@ -187,6 +245,12 @@ static int igt_gem_hibernate(void *arg)
if (err)
goto out;
+ if (!HAS_MAPPABLE_APERTURE(i915)) {
+ err = trash_stolen_gpu(ctx);
+ if (err)
+ goto out;
+ }
+
err = pm_prepare(i915);
if (err)
goto out;
@@ -194,7 +258,8 @@ static int igt_gem_hibernate(void *arg)
pm_hibernate(i915);
/* Here be dragons! */
- simulate_hibernate(i915);
+ if (HAS_MAPPABLE_APERTURE(i915))
+ trash_stolen_cpu(i915);
pm_resume(i915);
--
2.20.1
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