qxl: prepare memslot code for suspend/resume

this splits out initing the hw memslots from the guest info, and
creates an entrypoint for s/r to use.
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/qxl/qxl_drv.h

@@ -331,6 +331,8 @@ void qxl_modeset_fini(struct qxl_device *qdev);
 int qxl_bo_init(struct qxl_device *qdev);
 void qxl_bo_fini(struct qxl_device *qdev);
 
+void qxl_reinit_memslots(struct qxl_device *qdev);
+
 struct qxl_ring *qxl_ring_create(struct qxl_ring_header *header,
 				 int element_size,
 				 int n_elements,

drivers/gpu/drm/qxl/qxl_kms.c

@@ -72,21 +72,28 @@ static bool qxl_check_device(struct qxl_device *qdev)
 	return true;
 }
 
+static void setup_hw_slot(struct qxl_device *qdev, int slot_index,
+			  struct qxl_memslot *slot)
+{
+	qdev->ram_header->mem_slot.mem_start = slot->start_phys_addr;
+	qdev->ram_header->mem_slot.mem_end = slot->end_phys_addr;
+	qxl_io_memslot_add(qdev, slot_index);
+}
+
 static uint8_t setup_slot(struct qxl_device *qdev, uint8_t slot_index_offset,
 	unsigned long start_phys_addr, unsigned long end_phys_addr)
 {
 	uint64_t high_bits;
 	struct qxl_memslot *slot;
 	uint8_t slot_index;
-	struct qxl_ram_header *ram_header = qdev->ram_header;
 
 	slot_index = qdev->rom->slots_start + slot_index_offset;
 	slot = &qdev->mem_slots[slot_index];
 	slot->start_phys_addr = start_phys_addr;
 	slot->end_phys_addr = end_phys_addr;
-	ram_header->mem_slot.mem_start = slot->start_phys_addr;
-	ram_header->mem_slot.mem_end = slot->end_phys_addr;
-	qxl_io_memslot_add(qdev, slot_index);
+
+	setup_hw_slot(qdev, slot_index, slot);
+
 	slot->generation = qdev->rom->slot_generation;
 	high_bits = slot_index << qdev->slot_gen_bits;
 	high_bits |= slot->generation;
@@ -95,6 +102,12 @@ static uint8_t setup_slot(struct qxl_device *qdev, uint8_t slot_index_offset,
 	return slot_index;
 }
 
+void qxl_reinit_memslots(struct qxl_device *qdev)
+{
+	setup_hw_slot(qdev, qdev->main_mem_slot, &qdev->mem_slots[qdev->main_mem_slot]);
+	setup_hw_slot(qdev, qdev->surfaces_mem_slot, &qdev->mem_slots[qdev->surfaces_mem_slot]);
+}
+
 static void qxl_gc_work(struct work_struct *work)
 {
 	struct qxl_device *qdev = container_of(work, struct qxl_device, gc_work);