From a7c2647034fa34e03d3f4e2cf66315440db2aa14 Mon Sep 17 00:00:00 2001 From: "Hook, Gary" Date: Tue, 9 Jul 2019 15:07:35 +0000 Subject: [PATCH] crypto: ccp - Add a module parameter to control registration for DMA The CCP driver is able to act as a DMA engine. Add a module parameter that allows this feature to be enabled/disabled. Signed-off-by: Gary R Hook Signed-off-by: Herbert Xu --- drivers/crypto/ccp/ccp-dmaengine.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/crypto/ccp/ccp-dmaengine.c b/drivers/crypto/ccp/ccp-dmaengine.c index 7f22a45bbc11..9d077c42bcbe 100644 --- a/drivers/crypto/ccp/ccp-dmaengine.c +++ b/drivers/crypto/ccp/ccp-dmaengine.c @@ -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 */ @@ -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); -- 2.39.5