1 files changed, 79 insertions, 2 deletions

diff --git a/drivers/gpu/drm/xe/xe_ggtt.c b/drivers/gpu/drm/xe/xe_ggtt.c
index 3efd2d066b..ab96edb058 100644
--- a/drivers/gpu/drm/xe/xe_ggtt.c
+++ b/drivers/gpu/drm/xe/xe_ggtt.c
@@ -11,12 +11,16 @@
 #include <drm/i915_drm.h>
 
 #include "regs/xe_gt_regs.h"
+#include "regs/xe_regs.h"
+#include "xe_assert.h"
 #include "xe_bo.h"
 #include "xe_device.h"
 #include "xe_gt.h"
+#include "xe_gt_printk.h"
 #include "xe_gt_tlb_invalidation.h"
 #include "xe_map.h"
 #include "xe_mmio.h"
+#include "xe_sriov.h"
 #include "xe_wopcm.h"
 
 #define XELPG_GGTT_PTE_PAT0	BIT_ULL(52)
@@ -141,7 +145,11 @@ int xe_ggtt_init_early(struct xe_ggtt *ggtt)
 	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
 	unsigned int gsm_size;
 
-	gsm_size = probe_gsm_size(pdev);
+	if (IS_SRIOV_VF(xe))
+		gsm_size = SZ_8M; /* GGTT is expected to be 4GiB */
+	else
+		gsm_size = probe_gsm_size(pdev);
+
 	if (gsm_size == 0) {
 		drm_err(&xe->drm, "Hardware reported no preallocated GSM\n");
 		return -ENOMEM;
@@ -312,6 +320,74 @@ void xe_ggtt_printk(struct xe_ggtt *ggtt, const char *prefix)
 	}
 }
 
+static void xe_ggtt_dump_node(struct xe_ggtt *ggtt,
+			      const struct drm_mm_node *node, const char *description)
+{
+	char buf[10];
+
+	if (IS_ENABLED(CONFIG_DRM_XE_DEBUG)) {
+		string_get_size(node->size, 1, STRING_UNITS_2, buf, sizeof(buf));
+		xe_gt_dbg(ggtt->tile->primary_gt, "GGTT %#llx-%#llx (%s) %s\n",
+			  node->start, node->start + node->size, buf, description);
+	}
+}
+
+/**
+ * xe_ggtt_balloon - prevent allocation of specified GGTT addresses
+ * @ggtt: the &xe_ggtt where we want to make reservation
+ * @start: the starting GGTT address of the reserved region
+ * @end: then end GGTT address of the reserved region
+ * @node: the &drm_mm_node to hold reserved GGTT node
+ *
+ * Use xe_ggtt_deballoon() to release a reserved GGTT node.
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int xe_ggtt_balloon(struct xe_ggtt *ggtt, u64 start, u64 end, struct drm_mm_node *node)
+{
+	int err;
+
+	xe_tile_assert(ggtt->tile, start < end);
+	xe_tile_assert(ggtt->tile, IS_ALIGNED(start, XE_PAGE_SIZE));
+	xe_tile_assert(ggtt->tile, IS_ALIGNED(end, XE_PAGE_SIZE));
+	xe_tile_assert(ggtt->tile, !drm_mm_node_allocated(node));
+
+	node->color = 0;
+	node->start = start;
+	node->size = end - start;
+
+	mutex_lock(&ggtt->lock);
+	err = drm_mm_reserve_node(&ggtt->mm, node);
+	mutex_unlock(&ggtt->lock);
+
+	if (xe_gt_WARN(ggtt->tile->primary_gt, err,
+		       "Failed to balloon GGTT %#llx-%#llx (%pe)\n",
+		       node->start, node->start + node->size, ERR_PTR(err)))
+		return err;
+
+	xe_ggtt_dump_node(ggtt, node, "balloon");
+	return 0;
+}
+
+/**
+ * xe_ggtt_deballoon - release a reserved GGTT region
+ * @ggtt: the &xe_ggtt where reserved node belongs
+ * @node: the &drm_mm_node with reserved GGTT region
+ *
+ * See xe_ggtt_balloon() for details.
+ */
+void xe_ggtt_deballoon(struct xe_ggtt *ggtt, struct drm_mm_node *node)
+{
+	if (!drm_mm_node_allocated(node))
+		return;
+
+	xe_ggtt_dump_node(ggtt, node, "deballoon");
+
+	mutex_lock(&ggtt->lock);
+	drm_mm_remove_node(node);
+	mutex_unlock(&ggtt->lock);
+}
+
 int xe_ggtt_insert_special_node_locked(struct xe_ggtt *ggtt, struct drm_mm_node *node,
 				       u32 size, u32 align, u32 mm_flags)
 {
@@ -334,7 +410,8 @@ int xe_ggtt_insert_special_node(struct xe_ggtt *ggtt, struct drm_mm_node *node,
 
 void xe_ggtt_map_bo(struct xe_ggtt *ggtt, struct xe_bo *bo)
 {
-	u16 pat_index = tile_to_xe(ggtt->tile)->pat.idx[XE_CACHE_WB];
+	u16 cache_mode = bo->flags & XE_BO_NEEDS_UC ? XE_CACHE_NONE : XE_CACHE_WB;
+	u16 pat_index = tile_to_xe(ggtt->tile)->pat.idx[cache_mode];
 	u64 start = bo->ggtt_node.start;
 	u64 offset, pte;