diff options
author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-10 15:21:55 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-10 15:21:55 +0200 |
commit | f78a8236c6502760705399dfa42e22ab11aa1e6b (patch) | |
tree | d965f09daff0d531c63e35c764e7061f9c43afe7 /drivers/crypto/ccp/ccp-dmaengine.c | |
parent | 6cb3d05f3030deed157c9bbada5c58e7ee0f5172 (diff) | |
parent | 39da7c509acff13fc8cb12ec1bb20337c988ed36 (diff) |
Merge 4.11-rc6 into staging-next
We want the staging and iio fixes in here to handle merging easier.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/crypto/ccp/ccp-dmaengine.c')
-rw-r--r-- | drivers/crypto/ccp/ccp-dmaengine.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/crypto/ccp/ccp-dmaengine.c b/drivers/crypto/ccp/ccp-dmaengine.c index 8d0eeb46d4a2..e00be01fbf5a 100644 --- a/drivers/crypto/ccp/ccp-dmaengine.c +++ b/drivers/crypto/ccp/ccp-dmaengine.c @@ -10,6 +10,7 @@ * published by the Free Software Foundation. */ +#include <linux/module.h> #include <linux/kernel.h> #include <linux/dmaengine.h> #include <linux/spinlock.h> @@ -25,6 +26,37 @@ (mask == 0) ? 64 : fls64(mask); \ }) +/* The CCP as a DMA provider can be configured for public or private + * channels. Default is specified in the vdata for the device (PCI ID). + * This module parameter will override for all channels on all devices: + * dma_chan_attr = 0x2 to force all channels public + * = 0x1 to force all channels private + * = 0x0 to defer to the vdata setting + * = any other value: warning, revert to 0x0 + */ +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"); + +unsigned int ccp_get_dma_chan_attr(struct ccp_device *ccp) +{ + switch (dma_chan_attr) { + case CCP_DMA_DFLT: + return ccp->vdata->dma_chan_attr; + + case CCP_DMA_PRIV: + return DMA_PRIVATE; + + case CCP_DMA_PUB: + return 0; + + default: + dev_info_once(ccp->dev, "Invalid value for dma_chan_attr: %d\n", + dma_chan_attr); + return ccp->vdata->dma_chan_attr; + } +} + static void ccp_free_cmd_resources(struct ccp_device *ccp, struct list_head *list) { @@ -675,6 +707,15 @@ int ccp_dmaengine_register(struct ccp_device *ccp) dma_cap_set(DMA_SG, dma_dev->cap_mask); dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask); + /* The DMA channels for this device can be set to public or private, + * and overridden by the module parameter dma_chan_attr. + * Default: according to the value in vdata (dma_chan_attr=0) + * dma_chan_attr=0x1: all channels private (override vdata) + * dma_chan_attr=0x2: all channels public (override vdata) + */ + if (ccp_get_dma_chan_attr(ccp) == DMA_PRIVATE) + dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask); + INIT_LIST_HEAD(&dma_dev->channels); for (i = 0; i < ccp->cmd_q_count; i++) { chan = ccp->ccp_dma_chan + i; |