diff options
| author |   Hook, Gary <Gary.Hook@amd.com> | 2019-07-09 15:07:35 +0000 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2019-07-26 22:08:04 +1000 |
| commit | a7c2647034fa34e03d3f4e2cf66315440db2aa14 (patch) | |
| tree | 2d9ceedf77d0ecc4592ac215f41986563039cc22 /drivers/crypto/ccp/ccp-dmaengine.c | |
| parent | crypto: ccp - module parameter to limit the number of enabled CCPs (diff) | |
| download | linux-dev-a7c2647034fa34e03d3f4e2cf66315440db2aa14.tar.xz linux-dev-a7c2647034fa34e03d3f4e2cf66315440db2aa14.zip | |
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>
Diffstat (limited to 'drivers/crypto/ccp/ccp-dmaengine.c')
| -rw-r--r-- | drivers/crypto/ccp/ccp-dmaengine.c | 12 |
1 files changed, 11 insertions, 1 deletions
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 <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); |