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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/crypto/ccp/ccp-dmaengine.c
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@@ -1,17 +1,15 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * AMD Cryptographic Coprocessor (CCP) driver
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  *
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- * Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
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+ * Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
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  *
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  * Author: Gary R Hook <gary.hook@amd.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/module.h>
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 #include <linux/kernel.h>
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+#include <linux/dma-mapping.h>
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 #include <linux/dmaengine.h>
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 #include <linux/spinlock.h>
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 #include <linux/mutex.h>
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@@ -37,6 +35,10 @@
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 static unsigned int dma_chan_attr = CCP_DMA_DFLT;
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 module_param(dma_chan_attr, uint, 0444);
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 MODULE_PARM_DESC(dma_chan_attr, "Set DMA channel visibility: 0 (default) = device defaults, 1 = make private, 2 = make public");
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+
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+static unsigned int dmaengine = 1;
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+module_param(dmaengine, uint, 0444);
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+MODULE_PARM_DESC(dmaengine, "Register services with the DMA subsystem (any non-zero value, default: 1)");
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 static unsigned int ccp_get_dma_chan_attr(struct ccp_device *ccp)
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 {
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@@ -631,6 +633,24 @@
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 	return 0;
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 }
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+static void ccp_dma_release(struct ccp_device *ccp)
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+{
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+	struct ccp_dma_chan *chan;
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+	struct dma_chan *dma_chan;
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+	unsigned int i;
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+
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+	for (i = 0; i < ccp->cmd_q_count; i++) {
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+		chan = ccp->ccp_dma_chan + i;
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+		dma_chan = &chan->dma_chan;
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+
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+		if (dma_chan->client_count)
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+			dma_release_channel(dma_chan);
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+
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+		tasklet_kill(&chan->cleanup_tasklet);
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+		list_del_rcu(&dma_chan->device_node);
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+	}
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+}
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+
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 int ccp_dmaengine_register(struct ccp_device *ccp)
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 {
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 	struct ccp_dma_chan *chan;
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@@ -640,6 +660,9 @@
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 	char *dma_desc_cache_name;
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 	unsigned int i;
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 	int ret;
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+
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+	if (!dmaengine)
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+		return 0;
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 	ccp->ccp_dma_chan = devm_kcalloc(ccp->dev, ccp->cmd_q_count,
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 					 sizeof(*(ccp->ccp_dma_chan)),
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@@ -732,6 +755,7 @@
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 	return 0;
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 err_reg:
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+	ccp_dma_release(ccp);
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 	kmem_cache_destroy(ccp->dma_desc_cache);
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 err_cache:
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@@ -744,6 +768,10 @@
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 {
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 	struct dma_device *dma_dev = &ccp->dma_dev;
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+	if (!dmaengine)
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+		return;
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+
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+	ccp_dma_release(ccp);
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 	dma_async_device_unregister(dma_dev);
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 	kmem_cache_destroy(ccp->dma_desc_cache);