[PATCH v5 1/4] drm/xe/ggtt: Introduce full GGTT range size

["Piórkowski, Piotr" <piotr.piorkowski@intel.com>]

From: Piotr Piórkowski <piotr.piorkowski@intel.com>

Separate the full assigned GGTT range size from the size available for
regular allocations.

For now both sizes are identical. A subsequent change will reserve part of
the full range for VF provisioning.

Assisted-by: Claude:claude-5-sonnet
Signed-off-by: Piotr Piórkowski <piotr.piorkowski@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Maarten Lankhorst <dev@lankhorst.se>
---
 drivers/gpu/drm/xe/xe_ggtt.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/xe/xe_ggtt.c b/drivers/gpu/drm/xe/xe_ggtt.c
index 63e8bf1936058..c54a4cf967df9 100644
--- a/drivers/gpu/drm/xe/xe_ggtt.c
+++ b/drivers/gpu/drm/xe/xe_ggtt.c
@@ -112,9 +112,11 @@ struct xe_ggtt_pt_ops {
 struct xe_ggtt {
 	/** @tile: Back pointer to tile where this GGTT belongs */
 	struct xe_tile *tile;
-	/** @start: Start offset of GGTT */
+	/** @start: Start offset of the assigned GGTT range */
 	u64 start;
-	/** @size: Total usable size of this GGTT */
+	/** @full_size: Full size of the assigned GGTT range */
+	u64 full_size;
+	/** @size: Size of the GGTT range for regular use */
 	u64 size;
 	/**
 	 * @flags: Flags for this GGTT.
@@ -239,7 +241,7 @@ u64 xe_ggtt_size(struct xe_ggtt *ggtt)
 static void xe_ggtt_set_pte(struct xe_ggtt *ggtt, u64 addr, u64 pte)
 {
 	xe_tile_assert(ggtt->tile, !(addr & XE_PTE_MASK));
-	xe_tile_assert(ggtt->tile, addr < ggtt->start + ggtt->size);
+	xe_tile_assert(ggtt->tile, addr < ggtt->start + ggtt->full_size);
 
 	writeq(pte, &ggtt->gsm[addr >> XE_PTE_SHIFT]);
 }
@@ -253,7 +255,7 @@ static void xe_ggtt_set_pte_and_flush(struct xe_ggtt *ggtt, u64 addr, u64 pte)
 static u64 xe_ggtt_get_pte(struct xe_ggtt *ggtt, u64 addr)
 {
 	xe_tile_assert(ggtt->tile, !(addr & XE_PTE_MASK));
-	xe_tile_assert(ggtt->tile, addr < ggtt->start + ggtt->size);
+	xe_tile_assert(ggtt->tile, addr < ggtt->start + ggtt->full_size);
 
 	return readq(&ggtt->gsm[addr >> XE_PTE_SHIFT]);
 }
@@ -358,6 +360,7 @@ static const struct xe_ggtt_pt_ops xelpg_pt_wa_ops = {
 static void __xe_ggtt_init_early(struct xe_ggtt *ggtt, u64 start, u64 size)
 {
 	ggtt->start = start;
+	ggtt->full_size = size;
 	ggtt->size = size;
 	drm_mm_init(&ggtt->mm, 0, size);
 }
-- 
2.34.1