drm/xe: Introduce xe_ggtt_print_holes

Introduce a new xe_ggtt_print_holes helper that attends the SRIOV
demand and finishes the goal of limiting drm_mm access to xe_ggtt.

Cc: Michal Wajdeczko <[e-mail]>
Reviewed-by: Jonathan Cavitt <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]
Signed-off-by: Rodrigo Vivi <[e-mail]>

drivers/gpu/drm/xe/xe_ggtt.c

···
 	mutex_unlock(&ggtt->lock);
 	return err;
 }
+
+/**
+ * xe_ggtt_print_holes - Print holes
+ * @ggtt: the &xe_ggtt to be inspected
+ * @alignment: min alignment
+ * @p: the &drm_printer
+ *
+ * Print GGTT ranges that are available and return total size available.
+ *
+ * Return: Total available size.
+ */
+u64 xe_ggtt_print_holes(struct xe_ggtt *ggtt, u64 alignment, struct drm_printer *p)
+{
+	const struct drm_mm *mm = &ggtt->mm;
+	const struct drm_mm_node *entry;
+	u64 hole_min_start = xe_wopcm_size(tile_to_xe(ggtt->tile));
+	u64 hole_start, hole_end, hole_size;
+	u64 total;
+	char buf[10];
+
+	mutex_lock(&ggtt->lock);
+
+	drm_mm_for_each_hole(entry, mm, hole_start, hole_end) {
+		hole_start = max(hole_start, hole_min_start);
+		hole_start = ALIGN(hole_start, alignment);
+		hole_end = ALIGN_DOWN(hole_end, alignment);
+		if (hole_start >= hole_end)
+			continue;
+		hole_size = hole_end - hole_start;
+		total += hole_size;
+
+		string_get_size(hole_size, 1, STRING_UNITS_2, buf, sizeof(buf));
+		drm_printf(p, "range:\t%#llx-%#llx\t(%s)\n",
+			   hole_start, hole_end - 1, buf);
+	}
+
+	mutex_unlock(&ggtt->lock);
+
+	return total;
+}

drivers/gpu/drm/xe/xe_ggtt.h

···
 u64 xe_ggtt_largest_hole(struct xe_ggtt *ggtt, u64 alignment, u64 *spare);
 
 int xe_ggtt_dump(struct xe_ggtt *ggtt, struct drm_printer *p);
+u64 xe_ggtt_print_holes(struct xe_ggtt *ggtt, u64 alignment, struct drm_printer *p);
 
 #ifdef CONFIG_PCI_IOV
 void xe_ggtt_assign(struct xe_ggtt *ggtt, const struct xe_ggtt_node *node, u16 vfid);

drivers/gpu/drm/xe/xe_gt_sriov_pf_config.c

···
 #include <linux/string_choices.h>
 #include <linux/wordpart.h>
 
-/* FIXME: remove this after encapsulating all drm_mm_node access into xe_ggtt */
-#include <drm/drm_mm.h>
-
 #include "abi/guc_actions_sriov_abi.h"
 #include "abi/guc_klvs_abi.h"
 
···
 int xe_gt_sriov_pf_config_print_available_ggtt(struct xe_gt *gt, struct drm_printer *p)
 {
 	struct xe_ggtt *ggtt = gt_to_tile(gt)->mem.ggtt;
-	const struct drm_mm *mm = &ggtt->mm;
-	const struct drm_mm_node *entry;
 	u64 alignment = pf_get_ggtt_alignment(gt);
-	u64 hole_min_start = xe_wopcm_size(gt_to_xe(gt));
-	u64 hole_start, hole_end, hole_size;
 	u64 spare, avail, total = 0;
 	char buf[10];
 
···
 	mutex_lock(xe_gt_sriov_pf_master_mutex(gt));
 
 	spare = pf_get_spare_ggtt(gt);
+	total = xe_ggtt_print_holes(ggtt, alignment, p);
 
-	mutex_lock(&ggtt->lock);
-
-	drm_mm_for_each_hole(entry, mm, hole_start, hole_end) {
-		hole_start = max(hole_start, hole_min_start);
-		hole_start = ALIGN(hole_start, alignment);
-		hole_end = ALIGN_DOWN(hole_end, alignment);
-		if (hole_start >= hole_end)
-			continue;
-		hole_size = hole_end - hole_start;
-		total += hole_size;
-
-		string_get_size(hole_size, 1, STRING_UNITS_2, buf, sizeof(buf));
-		drm_printf(p, "range:\t%#llx-%#llx\t(%s)\n",
-			   hole_start, hole_end - 1, buf);
-	}
-
-	mutex_unlock(&ggtt->lock);
 	mutex_unlock(xe_gt_sriov_pf_master_mutex(gt));
 
 	string_get_size(total, 1, STRING_UNITS_2, buf, sizeof(buf));