habanalabs: reject host map with mmu disabled

This is not something we can do a workaround. It is clearly an error
and we should notify the user that it is an error.
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/misc/habanalabs/common/memory.c

@@ -1967,16 +1967,15 @@ static int export_dmabuf_from_handle(struct hl_ctx *ctx, u64 handle, int flags,
 static int mem_ioctl_no_mmu(struct hl_fpriv *hpriv, union hl_mem_args *args)
 {
 	struct hl_device *hdev = hpriv->hdev;
-	struct hl_ctx *ctx = hpriv->ctx;
 	u64 block_handle, device_addr = 0;
+	struct hl_ctx *ctx = hpriv->ctx;
 	u32 handle = 0, block_size;
-	int rc, dmabuf_fd = -EBADF;
+	int rc;
 
 	switch (args->in.op) {
 	case HL_MEM_OP_ALLOC:
 		if (args->in.alloc.mem_size == 0) {
-			dev_err(hdev->dev,
-				"alloc size must be larger than 0\n");
+			dev_err(hdev->dev, "alloc size must be larger than 0\n");
 			rc = -EINVAL;
 			goto out;
 		}
@@ -1997,15 +1996,14 @@ static int mem_ioctl_no_mmu(struct hl_fpriv *hpriv, union hl_mem_args *args)
 
 	case HL_MEM_OP_MAP:
 		if (args->in.flags & HL_MEM_USERPTR) {
-			device_addr = args->in.map_host.host_virt_addr;
-			rc = 0;
+			dev_err(hdev->dev, "Failed to map host memory when MMU is disabled\n");
+			rc = -EPERM;
 		} else {
-			rc = get_paddr_from_handle(ctx, &args->in,
-							&device_addr);
-		}
-
+			rc = get_paddr_from_handle(ctx, &args->in, &device_addr);
 			memset(args, 0, sizeof(*args));
 			args->out.device_virt_addr = device_addr;
+		}
+
 		break;
 
 	case HL_MEM_OP_UNMAP:
@@ -2013,20 +2011,14 @@ static int mem_ioctl_no_mmu(struct hl_fpriv *hpriv, union hl_mem_args *args)
 		break;
 
 	case HL_MEM_OP_MAP_BLOCK:
-		rc = map_block(hdev, args->in.map_block.block_addr,
-				&block_handle, &block_size);
+		rc = map_block(hdev, args->in.map_block.block_addr, &block_handle, &block_size);
 		args->out.block_handle = block_handle;
 		args->out.block_size = block_size;
 		break;
 
 	case HL_MEM_OP_EXPORT_DMABUF_FD:
-		rc = export_dmabuf_from_addr(ctx,
-				args->in.export_dmabuf_fd.handle,
-				args->in.export_dmabuf_fd.mem_size,
-				args->in.flags,
-				&dmabuf_fd);
-		memset(args, 0, sizeof(*args));
-		args->out.fd = dmabuf_fd;
+		dev_err(hdev->dev, "Failed to export dma-buf object when MMU is disabled\n");
+		rc = -EPERM;
 		break;
 
 	default: