habanalabs: fix bug when mapping very large memory area

This patch fixes a bug of allocating a too big memory size with kmalloc,
which causes a failure.
In case of mapping a large memory block, an array of the relevant physical
page addresses is allocated. If there are many pages the array might be
too big to allocate with kmalloc, hence changing to kvmalloc.
Signed-off-by: Omer Shpigelman <oshpigelman@habana.ai>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>

drivers/misc/habanalabs/memory.c

@@ -93,7 +93,7 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
 	phys_pg_pack->flags = args->flags;
 	phys_pg_pack->contiguous = contiguous;
 
-	phys_pg_pack->pages = kcalloc(num_pgs, sizeof(u64), GFP_KERNEL);
+	phys_pg_pack->pages = kvmalloc_array(num_pgs, sizeof(u64), GFP_KERNEL);
 	if (!phys_pg_pack->pages) {
 		rc = -ENOMEM;
 		goto pages_arr_err;
@@ -148,7 +148,7 @@ static int alloc_device_memory(struct hl_ctx *ctx, struct hl_mem_in *args,
 			gen_pool_free(vm->dram_pg_pool, phys_pg_pack->pages[i],
 					page_size);
 
-	kfree(phys_pg_pack->pages);
+	kvfree(phys_pg_pack->pages);
 pages_arr_err:
 	kfree(phys_pg_pack);
 pages_pack_err:
@@ -288,7 +288,7 @@ static void free_phys_pg_pack(struct hl_device *hdev,
 		}
 	}
 
-	kfree(phys_pg_pack->pages);
+	kvfree(phys_pg_pack->pages);
 	kfree(phys_pg_pack);
 }
 
@@ -692,7 +692,8 @@ static int init_phys_pg_pack_from_userptr(struct hl_ctx *ctx,
 
 	page_mask = ~(((u64) page_size) - 1);
 
-	phys_pg_pack->pages = kcalloc(total_npages, sizeof(u64), GFP_KERNEL);
+	phys_pg_pack->pages = kvmalloc_array(total_npages, sizeof(u64),
+						GFP_KERNEL);
 	if (!phys_pg_pack->pages) {
 		rc = -ENOMEM;
 		goto page_pack_arr_mem_err;