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![Colin Ian King](/assets/img/avatar_default.png)
Function ccp_get_dma_chan_attr is local to the source and does not need to be in global scope, so make it static. Cleans up sparse warning: drivers/crypto/ccp/ccp-dmaengine.c:41:14: warning: symbol 'ccp_get_dma_chan_attr' was not declared. Should it be static? Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
750 lines
18 KiB
C
750 lines
18 KiB
C
/*
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* AMD Cryptographic Coprocessor (CCP) driver
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*
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* Copyright (C) 2016,2017 Advanced Micro Devices, Inc.
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*
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* Author: Gary R Hook <gary.hook@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/dmaengine.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <linux/ccp.h>
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#include "ccp-dev.h"
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#include "../../dma/dmaengine.h"
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#define CCP_DMA_WIDTH(_mask) \
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({ \
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u64 mask = _mask + 1; \
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(mask == 0) ? 64 : fls64(mask); \
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})
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/* The CCP as a DMA provider can be configured for public or private
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* channels. Default is specified in the vdata for the device (PCI ID).
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* This module parameter will override for all channels on all devices:
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* dma_chan_attr = 0x2 to force all channels public
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* = 0x1 to force all channels private
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* = 0x0 to defer to the vdata setting
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* = any other value: warning, revert to 0x0
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*/
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static unsigned int dma_chan_attr = CCP_DMA_DFLT;
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module_param(dma_chan_attr, uint, 0444);
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MODULE_PARM_DESC(dma_chan_attr, "Set DMA channel visibility: 0 (default) = device defaults, 1 = make private, 2 = make public");
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static unsigned int ccp_get_dma_chan_attr(struct ccp_device *ccp)
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{
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switch (dma_chan_attr) {
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case CCP_DMA_DFLT:
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return ccp->vdata->dma_chan_attr;
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case CCP_DMA_PRIV:
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return DMA_PRIVATE;
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case CCP_DMA_PUB:
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return 0;
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default:
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dev_info_once(ccp->dev, "Invalid value for dma_chan_attr: %d\n",
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dma_chan_attr);
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return ccp->vdata->dma_chan_attr;
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}
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}
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static void ccp_free_cmd_resources(struct ccp_device *ccp,
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struct list_head *list)
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{
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struct ccp_dma_cmd *cmd, *ctmp;
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list_for_each_entry_safe(cmd, ctmp, list, entry) {
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list_del(&cmd->entry);
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kmem_cache_free(ccp->dma_cmd_cache, cmd);
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}
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}
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static void ccp_free_desc_resources(struct ccp_device *ccp,
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struct list_head *list)
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{
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struct ccp_dma_desc *desc, *dtmp;
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list_for_each_entry_safe(desc, dtmp, list, entry) {
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ccp_free_cmd_resources(ccp, &desc->active);
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ccp_free_cmd_resources(ccp, &desc->pending);
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list_del(&desc->entry);
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kmem_cache_free(ccp->dma_desc_cache, desc);
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}
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}
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static void ccp_free_chan_resources(struct dma_chan *dma_chan)
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{
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struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
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dma_chan);
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unsigned long flags;
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dev_dbg(chan->ccp->dev, "%s - chan=%p\n", __func__, chan);
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spin_lock_irqsave(&chan->lock, flags);
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ccp_free_desc_resources(chan->ccp, &chan->complete);
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ccp_free_desc_resources(chan->ccp, &chan->active);
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ccp_free_desc_resources(chan->ccp, &chan->pending);
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ccp_free_desc_resources(chan->ccp, &chan->created);
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spin_unlock_irqrestore(&chan->lock, flags);
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}
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static void ccp_cleanup_desc_resources(struct ccp_device *ccp,
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struct list_head *list)
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{
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struct ccp_dma_desc *desc, *dtmp;
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list_for_each_entry_safe_reverse(desc, dtmp, list, entry) {
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if (!async_tx_test_ack(&desc->tx_desc))
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continue;
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dev_dbg(ccp->dev, "%s - desc=%p\n", __func__, desc);
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ccp_free_cmd_resources(ccp, &desc->active);
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ccp_free_cmd_resources(ccp, &desc->pending);
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list_del(&desc->entry);
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kmem_cache_free(ccp->dma_desc_cache, desc);
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}
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}
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static void ccp_do_cleanup(unsigned long data)
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{
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struct ccp_dma_chan *chan = (struct ccp_dma_chan *)data;
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unsigned long flags;
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dev_dbg(chan->ccp->dev, "%s - chan=%s\n", __func__,
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dma_chan_name(&chan->dma_chan));
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spin_lock_irqsave(&chan->lock, flags);
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ccp_cleanup_desc_resources(chan->ccp, &chan->complete);
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spin_unlock_irqrestore(&chan->lock, flags);
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}
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static int ccp_issue_next_cmd(struct ccp_dma_desc *desc)
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{
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struct ccp_dma_cmd *cmd;
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int ret;
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cmd = list_first_entry(&desc->pending, struct ccp_dma_cmd, entry);
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list_move(&cmd->entry, &desc->active);
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dev_dbg(desc->ccp->dev, "%s - tx %d, cmd=%p\n", __func__,
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desc->tx_desc.cookie, cmd);
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ret = ccp_enqueue_cmd(&cmd->ccp_cmd);
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if (!ret || (ret == -EINPROGRESS) || (ret == -EBUSY))
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return 0;
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dev_dbg(desc->ccp->dev, "%s - error: ret=%d, tx %d, cmd=%p\n", __func__,
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ret, desc->tx_desc.cookie, cmd);
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return ret;
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}
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static void ccp_free_active_cmd(struct ccp_dma_desc *desc)
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{
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struct ccp_dma_cmd *cmd;
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cmd = list_first_entry_or_null(&desc->active, struct ccp_dma_cmd,
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entry);
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if (!cmd)
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return;
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dev_dbg(desc->ccp->dev, "%s - freeing tx %d cmd=%p\n",
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__func__, desc->tx_desc.cookie, cmd);
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list_del(&cmd->entry);
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kmem_cache_free(desc->ccp->dma_cmd_cache, cmd);
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}
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static struct ccp_dma_desc *__ccp_next_dma_desc(struct ccp_dma_chan *chan,
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struct ccp_dma_desc *desc)
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{
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/* Move current DMA descriptor to the complete list */
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if (desc)
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list_move(&desc->entry, &chan->complete);
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/* Get the next DMA descriptor on the active list */
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desc = list_first_entry_or_null(&chan->active, struct ccp_dma_desc,
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entry);
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return desc;
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}
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static struct ccp_dma_desc *ccp_handle_active_desc(struct ccp_dma_chan *chan,
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struct ccp_dma_desc *desc)
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{
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struct dma_async_tx_descriptor *tx_desc;
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unsigned long flags;
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/* Loop over descriptors until one is found with commands */
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do {
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if (desc) {
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/* Remove the DMA command from the list and free it */
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ccp_free_active_cmd(desc);
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if (!list_empty(&desc->pending)) {
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/* No errors, keep going */
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if (desc->status != DMA_ERROR)
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return desc;
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/* Error, free remaining commands and move on */
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ccp_free_cmd_resources(desc->ccp,
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&desc->pending);
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}
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tx_desc = &desc->tx_desc;
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} else {
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tx_desc = NULL;
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}
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spin_lock_irqsave(&chan->lock, flags);
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if (desc) {
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if (desc->status != DMA_ERROR)
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desc->status = DMA_COMPLETE;
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dev_dbg(desc->ccp->dev,
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"%s - tx %d complete, status=%u\n", __func__,
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desc->tx_desc.cookie, desc->status);
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dma_cookie_complete(tx_desc);
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dma_descriptor_unmap(tx_desc);
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}
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desc = __ccp_next_dma_desc(chan, desc);
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spin_unlock_irqrestore(&chan->lock, flags);
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if (tx_desc) {
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dmaengine_desc_get_callback_invoke(tx_desc, NULL);
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dma_run_dependencies(tx_desc);
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}
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} while (desc);
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return NULL;
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}
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static struct ccp_dma_desc *__ccp_pending_to_active(struct ccp_dma_chan *chan)
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{
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struct ccp_dma_desc *desc;
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if (list_empty(&chan->pending))
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return NULL;
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desc = list_empty(&chan->active)
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? list_first_entry(&chan->pending, struct ccp_dma_desc, entry)
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: NULL;
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list_splice_tail_init(&chan->pending, &chan->active);
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return desc;
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}
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static void ccp_cmd_callback(void *data, int err)
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{
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struct ccp_dma_desc *desc = data;
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struct ccp_dma_chan *chan;
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int ret;
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if (err == -EINPROGRESS)
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return;
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chan = container_of(desc->tx_desc.chan, struct ccp_dma_chan,
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dma_chan);
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dev_dbg(chan->ccp->dev, "%s - tx %d callback, err=%d\n",
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__func__, desc->tx_desc.cookie, err);
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if (err)
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desc->status = DMA_ERROR;
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while (true) {
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/* Check for DMA descriptor completion */
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desc = ccp_handle_active_desc(chan, desc);
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/* Don't submit cmd if no descriptor or DMA is paused */
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if (!desc || (chan->status == DMA_PAUSED))
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break;
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ret = ccp_issue_next_cmd(desc);
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if (!ret)
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break;
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desc->status = DMA_ERROR;
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}
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tasklet_schedule(&chan->cleanup_tasklet);
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}
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static dma_cookie_t ccp_tx_submit(struct dma_async_tx_descriptor *tx_desc)
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{
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struct ccp_dma_desc *desc = container_of(tx_desc, struct ccp_dma_desc,
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tx_desc);
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struct ccp_dma_chan *chan;
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dma_cookie_t cookie;
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unsigned long flags;
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chan = container_of(tx_desc->chan, struct ccp_dma_chan, dma_chan);
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spin_lock_irqsave(&chan->lock, flags);
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cookie = dma_cookie_assign(tx_desc);
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list_del(&desc->entry);
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list_add_tail(&desc->entry, &chan->pending);
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spin_unlock_irqrestore(&chan->lock, flags);
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dev_dbg(chan->ccp->dev, "%s - added tx descriptor %d to pending list\n",
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__func__, cookie);
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return cookie;
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}
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static struct ccp_dma_cmd *ccp_alloc_dma_cmd(struct ccp_dma_chan *chan)
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{
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struct ccp_dma_cmd *cmd;
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cmd = kmem_cache_alloc(chan->ccp->dma_cmd_cache, GFP_NOWAIT);
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if (cmd)
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memset(cmd, 0, sizeof(*cmd));
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return cmd;
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}
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static struct ccp_dma_desc *ccp_alloc_dma_desc(struct ccp_dma_chan *chan,
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unsigned long flags)
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{
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struct ccp_dma_desc *desc;
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desc = kmem_cache_zalloc(chan->ccp->dma_desc_cache, GFP_NOWAIT);
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if (!desc)
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return NULL;
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dma_async_tx_descriptor_init(&desc->tx_desc, &chan->dma_chan);
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desc->tx_desc.flags = flags;
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desc->tx_desc.tx_submit = ccp_tx_submit;
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desc->ccp = chan->ccp;
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INIT_LIST_HEAD(&desc->pending);
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INIT_LIST_HEAD(&desc->active);
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desc->status = DMA_IN_PROGRESS;
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return desc;
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}
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static struct ccp_dma_desc *ccp_create_desc(struct dma_chan *dma_chan,
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struct scatterlist *dst_sg,
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unsigned int dst_nents,
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struct scatterlist *src_sg,
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unsigned int src_nents,
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unsigned long flags)
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{
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struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
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dma_chan);
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struct ccp_device *ccp = chan->ccp;
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struct ccp_dma_desc *desc;
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struct ccp_dma_cmd *cmd;
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struct ccp_cmd *ccp_cmd;
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struct ccp_passthru_nomap_engine *ccp_pt;
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unsigned int src_offset, src_len;
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unsigned int dst_offset, dst_len;
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unsigned int len;
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unsigned long sflags;
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size_t total_len;
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if (!dst_sg || !src_sg)
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return NULL;
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if (!dst_nents || !src_nents)
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return NULL;
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desc = ccp_alloc_dma_desc(chan, flags);
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if (!desc)
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return NULL;
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total_len = 0;
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src_len = sg_dma_len(src_sg);
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src_offset = 0;
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dst_len = sg_dma_len(dst_sg);
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dst_offset = 0;
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while (true) {
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if (!src_len) {
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src_nents--;
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if (!src_nents)
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break;
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src_sg = sg_next(src_sg);
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if (!src_sg)
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break;
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src_len = sg_dma_len(src_sg);
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src_offset = 0;
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continue;
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}
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if (!dst_len) {
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dst_nents--;
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if (!dst_nents)
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break;
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dst_sg = sg_next(dst_sg);
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if (!dst_sg)
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break;
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dst_len = sg_dma_len(dst_sg);
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dst_offset = 0;
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continue;
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}
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len = min(dst_len, src_len);
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cmd = ccp_alloc_dma_cmd(chan);
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if (!cmd)
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goto err;
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ccp_cmd = &cmd->ccp_cmd;
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ccp_cmd->ccp = chan->ccp;
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ccp_pt = &ccp_cmd->u.passthru_nomap;
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ccp_cmd->flags = CCP_CMD_MAY_BACKLOG;
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ccp_cmd->flags |= CCP_CMD_PASSTHRU_NO_DMA_MAP;
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ccp_cmd->engine = CCP_ENGINE_PASSTHRU;
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ccp_pt->bit_mod = CCP_PASSTHRU_BITWISE_NOOP;
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ccp_pt->byte_swap = CCP_PASSTHRU_BYTESWAP_NOOP;
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ccp_pt->src_dma = sg_dma_address(src_sg) + src_offset;
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ccp_pt->dst_dma = sg_dma_address(dst_sg) + dst_offset;
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ccp_pt->src_len = len;
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ccp_pt->final = 1;
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ccp_cmd->callback = ccp_cmd_callback;
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ccp_cmd->data = desc;
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list_add_tail(&cmd->entry, &desc->pending);
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dev_dbg(ccp->dev,
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"%s - cmd=%p, src=%pad, dst=%pad, len=%llu\n", __func__,
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cmd, &ccp_pt->src_dma,
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&ccp_pt->dst_dma, ccp_pt->src_len);
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total_len += len;
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src_len -= len;
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src_offset += len;
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dst_len -= len;
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dst_offset += len;
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}
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desc->len = total_len;
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if (list_empty(&desc->pending))
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goto err;
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dev_dbg(ccp->dev, "%s - desc=%p\n", __func__, desc);
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spin_lock_irqsave(&chan->lock, sflags);
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list_add_tail(&desc->entry, &chan->created);
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spin_unlock_irqrestore(&chan->lock, sflags);
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return desc;
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err:
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ccp_free_cmd_resources(ccp, &desc->pending);
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kmem_cache_free(ccp->dma_desc_cache, desc);
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return NULL;
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}
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static struct dma_async_tx_descriptor *ccp_prep_dma_memcpy(
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struct dma_chan *dma_chan, dma_addr_t dst, dma_addr_t src, size_t len,
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unsigned long flags)
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{
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struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
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dma_chan);
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struct ccp_dma_desc *desc;
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struct scatterlist dst_sg, src_sg;
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dev_dbg(chan->ccp->dev,
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"%s - src=%pad, dst=%pad, len=%zu, flags=%#lx\n",
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__func__, &src, &dst, len, flags);
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sg_init_table(&dst_sg, 1);
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sg_dma_address(&dst_sg) = dst;
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sg_dma_len(&dst_sg) = len;
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sg_init_table(&src_sg, 1);
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sg_dma_address(&src_sg) = src;
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sg_dma_len(&src_sg) = len;
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desc = ccp_create_desc(dma_chan, &dst_sg, 1, &src_sg, 1, flags);
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if (!desc)
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return NULL;
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return &desc->tx_desc;
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}
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static struct dma_async_tx_descriptor *ccp_prep_dma_interrupt(
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struct dma_chan *dma_chan, unsigned long flags)
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{
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struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
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dma_chan);
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struct ccp_dma_desc *desc;
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desc = ccp_alloc_dma_desc(chan, flags);
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if (!desc)
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return NULL;
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return &desc->tx_desc;
|
|
}
|
|
|
|
static void ccp_issue_pending(struct dma_chan *dma_chan)
|
|
{
|
|
struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
|
|
dma_chan);
|
|
struct ccp_dma_desc *desc;
|
|
unsigned long flags;
|
|
|
|
dev_dbg(chan->ccp->dev, "%s\n", __func__);
|
|
|
|
spin_lock_irqsave(&chan->lock, flags);
|
|
|
|
desc = __ccp_pending_to_active(chan);
|
|
|
|
spin_unlock_irqrestore(&chan->lock, flags);
|
|
|
|
/* If there was nothing active, start processing */
|
|
if (desc)
|
|
ccp_cmd_callback(desc, 0);
|
|
}
|
|
|
|
static enum dma_status ccp_tx_status(struct dma_chan *dma_chan,
|
|
dma_cookie_t cookie,
|
|
struct dma_tx_state *state)
|
|
{
|
|
struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
|
|
dma_chan);
|
|
struct ccp_dma_desc *desc;
|
|
enum dma_status ret;
|
|
unsigned long flags;
|
|
|
|
if (chan->status == DMA_PAUSED) {
|
|
ret = DMA_PAUSED;
|
|
goto out;
|
|
}
|
|
|
|
ret = dma_cookie_status(dma_chan, cookie, state);
|
|
if (ret == DMA_COMPLETE) {
|
|
spin_lock_irqsave(&chan->lock, flags);
|
|
|
|
/* Get status from complete chain, if still there */
|
|
list_for_each_entry(desc, &chan->complete, entry) {
|
|
if (desc->tx_desc.cookie != cookie)
|
|
continue;
|
|
|
|
ret = desc->status;
|
|
break;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&chan->lock, flags);
|
|
}
|
|
|
|
out:
|
|
dev_dbg(chan->ccp->dev, "%s - %u\n", __func__, ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ccp_pause(struct dma_chan *dma_chan)
|
|
{
|
|
struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
|
|
dma_chan);
|
|
|
|
chan->status = DMA_PAUSED;
|
|
|
|
/*TODO: Wait for active DMA to complete before returning? */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ccp_resume(struct dma_chan *dma_chan)
|
|
{
|
|
struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
|
|
dma_chan);
|
|
struct ccp_dma_desc *desc;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&chan->lock, flags);
|
|
|
|
desc = list_first_entry_or_null(&chan->active, struct ccp_dma_desc,
|
|
entry);
|
|
|
|
spin_unlock_irqrestore(&chan->lock, flags);
|
|
|
|
/* Indicate the channel is running again */
|
|
chan->status = DMA_IN_PROGRESS;
|
|
|
|
/* If there was something active, re-start */
|
|
if (desc)
|
|
ccp_cmd_callback(desc, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ccp_terminate_all(struct dma_chan *dma_chan)
|
|
{
|
|
struct ccp_dma_chan *chan = container_of(dma_chan, struct ccp_dma_chan,
|
|
dma_chan);
|
|
unsigned long flags;
|
|
|
|
dev_dbg(chan->ccp->dev, "%s\n", __func__);
|
|
|
|
/*TODO: Wait for active DMA to complete before continuing */
|
|
|
|
spin_lock_irqsave(&chan->lock, flags);
|
|
|
|
/*TODO: Purge the complete list? */
|
|
ccp_free_desc_resources(chan->ccp, &chan->active);
|
|
ccp_free_desc_resources(chan->ccp, &chan->pending);
|
|
ccp_free_desc_resources(chan->ccp, &chan->created);
|
|
|
|
spin_unlock_irqrestore(&chan->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ccp_dmaengine_register(struct ccp_device *ccp)
|
|
{
|
|
struct ccp_dma_chan *chan;
|
|
struct dma_device *dma_dev = &ccp->dma_dev;
|
|
struct dma_chan *dma_chan;
|
|
char *dma_cmd_cache_name;
|
|
char *dma_desc_cache_name;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
ccp->ccp_dma_chan = devm_kcalloc(ccp->dev, ccp->cmd_q_count,
|
|
sizeof(*(ccp->ccp_dma_chan)),
|
|
GFP_KERNEL);
|
|
if (!ccp->ccp_dma_chan)
|
|
return -ENOMEM;
|
|
|
|
dma_cmd_cache_name = devm_kasprintf(ccp->dev, GFP_KERNEL,
|
|
"%s-dmaengine-cmd-cache",
|
|
ccp->name);
|
|
if (!dma_cmd_cache_name)
|
|
return -ENOMEM;
|
|
|
|
ccp->dma_cmd_cache = kmem_cache_create(dma_cmd_cache_name,
|
|
sizeof(struct ccp_dma_cmd),
|
|
sizeof(void *),
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!ccp->dma_cmd_cache)
|
|
return -ENOMEM;
|
|
|
|
dma_desc_cache_name = devm_kasprintf(ccp->dev, GFP_KERNEL,
|
|
"%s-dmaengine-desc-cache",
|
|
ccp->name);
|
|
if (!dma_desc_cache_name) {
|
|
ret = -ENOMEM;
|
|
goto err_cache;
|
|
}
|
|
|
|
ccp->dma_desc_cache = kmem_cache_create(dma_desc_cache_name,
|
|
sizeof(struct ccp_dma_desc),
|
|
sizeof(void *),
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!ccp->dma_desc_cache) {
|
|
ret = -ENOMEM;
|
|
goto err_cache;
|
|
}
|
|
|
|
dma_dev->dev = ccp->dev;
|
|
dma_dev->src_addr_widths = CCP_DMA_WIDTH(dma_get_mask(ccp->dev));
|
|
dma_dev->dst_addr_widths = CCP_DMA_WIDTH(dma_get_mask(ccp->dev));
|
|
dma_dev->directions = DMA_MEM_TO_MEM;
|
|
dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
|
|
dma_cap_set(DMA_MEMCPY, 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;
|
|
dma_chan = &chan->dma_chan;
|
|
|
|
chan->ccp = ccp;
|
|
|
|
spin_lock_init(&chan->lock);
|
|
INIT_LIST_HEAD(&chan->created);
|
|
INIT_LIST_HEAD(&chan->pending);
|
|
INIT_LIST_HEAD(&chan->active);
|
|
INIT_LIST_HEAD(&chan->complete);
|
|
|
|
tasklet_init(&chan->cleanup_tasklet, ccp_do_cleanup,
|
|
(unsigned long)chan);
|
|
|
|
dma_chan->device = dma_dev;
|
|
dma_cookie_init(dma_chan);
|
|
|
|
list_add_tail(&dma_chan->device_node, &dma_dev->channels);
|
|
}
|
|
|
|
dma_dev->device_free_chan_resources = ccp_free_chan_resources;
|
|
dma_dev->device_prep_dma_memcpy = ccp_prep_dma_memcpy;
|
|
dma_dev->device_prep_dma_interrupt = ccp_prep_dma_interrupt;
|
|
dma_dev->device_issue_pending = ccp_issue_pending;
|
|
dma_dev->device_tx_status = ccp_tx_status;
|
|
dma_dev->device_pause = ccp_pause;
|
|
dma_dev->device_resume = ccp_resume;
|
|
dma_dev->device_terminate_all = ccp_terminate_all;
|
|
|
|
ret = dma_async_device_register(dma_dev);
|
|
if (ret)
|
|
goto err_reg;
|
|
|
|
return 0;
|
|
|
|
err_reg:
|
|
kmem_cache_destroy(ccp->dma_desc_cache);
|
|
|
|
err_cache:
|
|
kmem_cache_destroy(ccp->dma_cmd_cache);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void ccp_dmaengine_unregister(struct ccp_device *ccp)
|
|
{
|
|
struct dma_device *dma_dev = &ccp->dma_dev;
|
|
|
|
dma_async_device_unregister(dma_dev);
|
|
|
|
kmem_cache_destroy(ccp->dma_desc_cache);
|
|
kmem_cache_destroy(ccp->dma_cmd_cache);
|
|
}
|