accel/habanalabs: use exported size from dma_buf and not from phys_pg_pack

The 'exported_size' member in 'struct hl_vm_phys_pg_pack' is used to
keep the exported dma-buf size, to be later used when the buffer is
mapped.
However it is possible that the same phys_pg_pack will be exported more
than once, and independently of when the mapping takes place.
Remove this member from the phys_pg_pack structure, and simply use the
size in the dma-buf object as the exported size when mapping.

Signed-off-by: Tomer Tayar <ttayar@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

Author: Tomer Tayar

drivers/accel/habanalabs/common/habanalabs.h

@@ -2159,7 +2159,6 @@ struct hl_vm_hw_block_list_node {
  * @pages: the physical page array.
  * @npages: num physical pages in the pack.
  * @total_size: total size of all the pages in this list.
- * @exported_size: buffer exported size.
  * @node: used to attach to deletion list that is used when all the allocations are cleared
  *        at the teardown of the context.
  * @mapping_cnt: number of shared mappings.
@@ -2176,7 +2175,6 @@ struct hl_vm_phys_pg_pack {
 	u64			*pages;
 	u64			npages;
 	u64			total_size;
-	u64			exported_size;
 	struct list_head	node;
 	atomic_t		mapping_cnt;
 	u32			asid;

drivers/accel/habanalabs/common/memory.c

@@ -1719,7 +1719,7 @@ static struct sg_table *hl_map_dmabuf(struct dma_buf_attachment *attachment,
 						phys_pg_pack->pages,
 						phys_pg_pack->npages,
 						phys_pg_pack->page_size,
-						phys_pg_pack->exported_size,
+						hl_dmabuf->dmabuf->size,
 						attachment->dev,
 						dir);
 	else
@@ -2044,7 +2044,6 @@ static int export_dmabuf_from_addr(struct hl_ctx *ctx, u64 addr, u64 size, u64 o
 		if (rc)
 			goto dec_memhash_export_cnt;
 
-		phys_pg_pack->exported_size = size;
 		hl_dmabuf->phys_pg_pack = phys_pg_pack;
 		hl_dmabuf->memhash_hnode = hnode;
 	} else {