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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 <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Hook, Gary 2019-07-09 15:07:35 +00:00 committed by Herbert Xu
parent 90773bc1ab
commit a7c2647034
1 changed files with 11 additions and 1 deletions
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12
drivers/crypto/ccp/ccp-dmaengine.c
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@ -2,7 +2,7 @@
/* /*
* AMD Cryptographic Coprocessor (CCP) driver * 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> * 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_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"); 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) static unsigned int ccp_get_dma_chan_attr(struct ccp_device *ccp)
{ {
switch (dma_chan_attr) { switch (dma_chan_attr) {
@ -637,6 +641,9 @@ int ccp_dmaengine_register(struct ccp_device *ccp)
unsigned int i; unsigned int i;
int ret; int ret;
if (!dmaengine)
return 0;
ccp->ccp_dma_chan = devm_kcalloc(ccp->dev, ccp->cmd_q_count, ccp->ccp_dma_chan = devm_kcalloc(ccp->dev, ccp->cmd_q_count,
sizeof(*(ccp->ccp_dma_chan)), sizeof(*(ccp->ccp_dma_chan)),
GFP_KERNEL); GFP_KERNEL);
@ -740,6 +747,9 @@ void ccp_dmaengine_unregister(struct ccp_device *ccp)
{ {
struct dma_device *dma_dev = &ccp->dma_dev; struct dma_device *dma_dev = &ccp->dma_dev;
if (!dmaengine)
return;
dma_async_device_unregister(dma_dev); dma_async_device_unregister(dma_dev);
kmem_cache_destroy(ccp->dma_desc_cache); kmem_cache_destroy(ccp->dma_desc_cache);