[Lima] [PATCH 2/5] drm/lima: add lima_vm_map_bo

[Qiang Yu]

For dynamically mapping added backup memory of lima_bo to vm.
This is a preparation for adding heap buffer support.

Signed-off-by: Qiang Yu <yuq825 at gmail.com>
---
 drivers/gpu/drm/lima/lima_vm.c | 40 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/lima/lima_vm.h |  1 +
 2 files changed, 41 insertions(+)

diff --git a/drivers/gpu/drm/lima/lima_vm.c b/drivers/gpu/drm/lima/lima_vm.c
index 840e2350d872..d46f2a69ab42 100644
--- a/drivers/gpu/drm/lima/lima_vm.c
+++ b/drivers/gpu/drm/lima/lima_vm.c
@@ -277,3 +277,43 @@ void lima_vm_print(struct lima_vm *vm)
 		}
 	}
 }
+
+int lima_vm_map_bo(struct lima_vm *vm, struct lima_bo *bo, int pageoff)
+{
+	struct lima_bo_va *bo_va;
+	struct sg_dma_page_iter sg_iter;
+	int offset = 0, err;
+	u32 base;
+
+	mutex_lock(&bo->lock);
+
+	bo_va = lima_vm_bo_find(vm, bo);
+	if (!bo_va) {
+		err = -ENOENT;
+		goto err_out0;
+	}
+
+	mutex_lock(&vm->lock);
+
+	base = bo_va->node.start + (pageoff << PAGE_SHIFT);
+	for_each_sg_dma_page(bo->base.sgt->sgl, &sg_iter, bo->base.sgt->nents, pageoff) {
+		err = lima_vm_map_page(vm, sg_page_iter_dma_address(&sg_iter), base + offset);
+		if (err)
+			goto err_out1;
+
+		offset += PAGE_SIZE;
+	}
+
+	mutex_unlock(&vm->lock);
+
+	mutex_unlock(&bo->lock);
+	return 0;
+
+err_out1:
+	if (offset)
+		lima_vm_unmap_range(vm, base, base + offset - 1);
+	mutex_unlock(&vm->lock);
+err_out0:
+	mutex_unlock(&bo->lock);
+	return err;
+}
diff --git a/drivers/gpu/drm/lima/lima_vm.h b/drivers/gpu/drm/lima/lima_vm.h
index e0bdedcf14dd..22aeec77d84d 100644
--- a/drivers/gpu/drm/lima/lima_vm.h
+++ b/drivers/gpu/drm/lima/lima_vm.h
@@ -58,5 +58,6 @@ static inline void lima_vm_put(struct lima_vm *vm)
 }
 
 void lima_vm_print(struct lima_vm *vm);
+int lima_vm_map_bo(struct lima_vm *vm, struct lima_bo *bo, int pageoff);
 
 #endif
-- 
2.17.1