[PATCH v4 16/22] drm/xe/vm: Add a couple of VM debug printouts

["Thomas Hellström" <thomas.hellstrom@linux.intel.com>]

Add debug printouts that are valueable for pagemap prefetch,
migration and page collection.

v2:
- Add additional debug prinouts around migration and page collection.
- Require CONFIG_DRM_XE_DEBUG_VM.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com> #v1
---
 drivers/gpu/drm/xe/xe_svm.c | 10 ++++++++++
 drivers/gpu/drm/xe/xe_vm.c  |  7 +++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_svm.c b/drivers/gpu/drm/xe/xe_svm.c
index 6ebc1b43d0ca..30584def0c6c 100644
--- a/drivers/gpu/drm/xe/xe_svm.c
+++ b/drivers/gpu/drm/xe/xe_svm.c
@@ -1306,6 +1306,10 @@ static int __xe_svm_handle_pagefault(struct xe_vm *vm, struct xe_vma *vma,
 	if (err) {
 		range_debug(range, "PAGE FAULT - FAIL PAGE COLLECT");
 		goto out;
+	} else if (IS_ENABLED(CONFIG_DRM_XE_DEBUG_VM)) {
+		drm_dbg(&vm->xe->drm, "After page collect data location is %sin \"%s\".\n",
+			xe_svm_range_has_pagemap(range, dpagemap) ? "" : "NOT ",
+			dpagemap ? dpagemap->drm->unique : "System.");
 	}
 
 	xe_svm_range_get_pages_us_stats_incr(gt, range, get_pages_start);
@@ -1601,9 +1605,15 @@ struct drm_pagemap *xe_vma_resolve_pagemap(struct xe_vma *vma, struct xe_tile *t
 int xe_svm_alloc_vram(struct xe_svm_range *range, const struct drm_gpusvm_ctx *ctx,
 		      struct drm_pagemap *dpagemap)
 {
+	struct xe_device *xe = range_to_vm(&range->base)->xe;
+
 	xe_assert(range_to_vm(&range->base)->xe, range->base.pages.flags.migrate_devmem);
 	range_debug(range, "ALLOCATE VRAM");
 
+	if (IS_ENABLED(CONFIG_DRM_XE_DEBUG_VM))
+		drm_dbg(&xe->drm, "Request migration to device memory on \"%s\".\n",
+			dpagemap->drm->unique);
+
 	return drm_pagemap_populate_mm(dpagemap, xe_svm_range_start(range),
 				       xe_svm_range_end(range),
 				       range->base.gpusvm->mm,
diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index ae2c1d500d54..cccd3e6510f5 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -2928,6 +2928,13 @@ static int prefetch_ranges(struct xe_vm *vm, struct xe_vma_op *op)
 		if (!dpagemap)
 			xe_svm_range_migrate_to_smem(vm, svm_range);
 
+		if (IS_ENABLED(CONFIG_DRM_XE_DEBUG_VM)) {
+			drm_dbg(&vm->xe->drm,
+				"Prefetch pagemap is %s start 0x%016lx end 0x%016lx\n",
+				dpagemap ? dpagemap->drm->unique : "system",
+				xe_svm_range_start(svm_range), xe_svm_range_end(svm_range));
+		}
+
 		if (xe_svm_range_needs_migrate_to_vram(svm_range, vma, dpagemap)) {
 			err = xe_svm_alloc_vram(svm_range, &ctx, dpagemap);
 			if (err) {
-- 
2.51.1