[PATCH 16/16] [DEBUG] dump_stack stolen resource freeing during test

[Robert Beckett]

---
 drivers/gpu/drm/i915/gt/selftest_reset.c   | 12 ++++++++++++
 drivers/gpu/drm/i915/intel_memory_region.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/selftest_reset.c b/drivers/gpu/drm/i915/gt/selftest_reset.c
index ca130ccf63c7..2185d99532cd 100644
--- a/drivers/gpu/drm/i915/gt/selftest_reset.c
+++ b/drivers/gpu/drm/i915/gt/selftest_reset.c
@@ -58,6 +58,14 @@ static struct page ** alloc_orig(unsigned long num_pages)
 	return pages;
 }
 
+static void debug_free(struct intel_memory_region *mem, struct ttm_resource *res)
+{
+	pr_info("BOB_DEBUG: %s(): mem->name=%.16s res={ start=0x%lx num_pages=0x%lx mem_type=0x%x placement=0x%x }\n",
+			__func__, mem->name, res->start, res->num_pages, res->mem_type, res->placement);
+	pr_info("BOB_DEBUG: %s(): STACK:\n", __func__);
+	dump_stack();
+}
+
 static int
 __igt_reset_stolen(struct intel_gt *gt,
 		   intel_engine_mask_t mask,
@@ -141,6 +149,8 @@ __igt_reset_stolen(struct intel_gt *gt,
 		i915_request_add(rq);
 	}
 
+	gt->i915->mm.stolen_region->debug_free = debug_free;
+
 	for (page = 0; page < num_pages; page++) {
 		dma_addr_t dma = (dma_addr_t)dsm->start + (page << PAGE_SHIFT);
 		void __iomem *s;
@@ -257,6 +267,8 @@ __igt_reset_stolen(struct intel_gt *gt,
 	mb();
 	ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE);
 
+	gt->i915->mm.stolen_region->debug_free = NULL;
+
 	if (count > 0) {
 		pr_info("%s reset clobbered %ld pages of stolen, last clobber at page %ld\n",
 			msg, count, max);
diff --git a/drivers/gpu/drm/i915/intel_memory_region.h b/drivers/gpu/drm/i915/intel_memory_region.h
index 048955b5429f..d278a0eb0f7c 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.h
+++ b/drivers/gpu/drm/i915/intel_memory_region.h
@@ -93,6 +93,7 @@ struct intel_memory_region {
 	bool is_range_manager;
 
 	void *region_private;
+	void (*debug_free)(struct intel_memory_region *mem, struct ttm_resource *res);
 };
 
 struct intel_memory_region *
-- 
2.25.1