[Intel-gfx] [PATCH 2/4] drm/xe: Move d3cold_allowed decision all together.

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

And let's use the VRAM threshold to keep d3cold temporarily disabled.

With this we have the ability to run D3Cold experiments just by
touching the vram_d3cold_threshold sysfs entry.

Cc: Anshuman Gupta <anshuman.gupta@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/xe/xe_pci.c | 15 +--------------
 drivers/gpu/drm/xe/xe_pm.c  |  5 +++++
 drivers/gpu/drm/xe/xe_pm.h  |  7 ++++++-
 3 files changed, 12 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index 0c4051f4f746..06759afb4224 100644
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -834,20 +834,7 @@ static int xe_pci_runtime_idle(struct device *dev)
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct xe_device *xe = pdev_to_xe_device(pdev);
 
-	if (!xe->d3cold.capable) {
-		xe->d3cold.allowed = false;
-	} else {
-		xe_pm_d3cold_allowed_toggle(xe);
-
-		/*
-		 * TODO: d3cold should be allowed (true) if
-		 * (IS_DGFX(xe) && !xe_device_mem_access_ongoing(xe))
-		 * but maybe include some other conditions. So, before
-		 * we can re-enable the D3cold, we need to:
-		 * 1. rewrite the VRAM save / restore to avoid buffer object locks
-		 */
-		xe->d3cold.allowed = false;
-	}
+	xe_pm_d3cold_allowed_toggle(xe);
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/xe/xe_pm.c b/drivers/gpu/drm/xe/xe_pm.c
index 17a69b7af155..a6459df2599e 100644
--- a/drivers/gpu/drm/xe/xe_pm.c
+++ b/drivers/gpu/drm/xe/xe_pm.c
@@ -326,6 +326,11 @@ void xe_pm_d3cold_allowed_toggle(struct xe_device *xe)
 	u64 vram_used;
 	int i;
 
+	if (!xe->d3cold.capable) {
+		xe->d3cold.allowed = false;
+		return;
+	}
+
 	for (i = XE_PL_VRAM0; i <= XE_PL_VRAM1; ++i) {
 		man = ttm_manager_type(&xe->ttm, i);
 		if (man) {
diff --git a/drivers/gpu/drm/xe/xe_pm.h b/drivers/gpu/drm/xe/xe_pm.h
index 08a633ce5145..6b9031f7af24 100644
--- a/drivers/gpu/drm/xe/xe_pm.h
+++ b/drivers/gpu/drm/xe/xe_pm.h
@@ -8,7 +8,12 @@
 
 #include <linux/pm_runtime.h>
 
-#define DEFAULT_VRAM_THRESHOLD 300 /* in MB */
+/*
+ * TODO: Threshold = 0 will block D3Cold.
+ *       Before we can move this to a higher value (like 300), we need to:
+ *           1. rewrite the VRAM save / restore to avoid buffer object locks
+ */
+#define DEFAULT_VRAM_THRESHOLD 0 /* in MB */
 
 struct xe_device;
 
-- 
2.41.0