crypto: ccp - Add a module parameter to control registration for DMA (a7c26470) · Commits · 戴 / test

drivers/crypto/ccp/ccp-dmaengine.c

+11 −1

Original line number	Diff line number	Diff line
		@@ -2,7 +2,7 @@
		/*
		* AMD Cryptographic Coprocessor (CCP) driver
		*
		* Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
		* Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
		*
		* Author: Gary R Hook <gary.hook@amd.com>
		*/
		@@ -35,6 +35,10 @@ static unsigned int dma_chan_attr = CCP_DMA_DFLT;
		module_param(dma_chan_attr, uint, 0444);
		MODULE_PARM_DESC(dma_chan_attr, "Set DMA channel visibility: 0 (default) = device defaults, 1 = make private, 2 = make public");

		static unsigned int dmaengine = 1;
		module_param(dmaengine, uint, 0444);
		MODULE_PARM_DESC(dmaengine, "Register services with the DMA subsystem (any non-zero value, default: 1)");

		static unsigned int ccp_get_dma_chan_attr(struct ccp_device *ccp)
		{
		switch (dma_chan_attr) {
		@@ -637,6 +641,9 @@ int ccp_dmaengine_register(struct ccp_device *ccp)
		unsigned int i;
		int ret;

		if (!dmaengine)
		return 0;

		ccp->ccp_dma_chan = devm_kcalloc(ccp->dev, ccp->cmd_q_count,
		sizeof(*(ccp->ccp_dma_chan)),
		GFP_KERNEL);
		@@ -740,6 +747,9 @@ void ccp_dmaengine_unregister(struct ccp_device *ccp)
		{
		struct dma_device *dma_dev = &ccp->dma_dev;

		if (!dmaengine)
		return;

		dma_async_device_unregister(dma_dev);

		kmem_cache_destroy(ccp->dma_desc_cache);