From 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 07:44:59 +0000
Subject: [PATCH] gmac get mac form eeprom
---
kernel/drivers/crypto/ccp/ccp-dmaengine.c | 51 ++++++++++++++++++++++++++++++++++++++++++++++-----
1 files changed, 46 insertions(+), 5 deletions(-)
diff --git a/kernel/drivers/crypto/ccp/ccp-dmaengine.c b/kernel/drivers/crypto/ccp/ccp-dmaengine.c
index a83588d..e416456 100644
--- a/kernel/drivers/crypto/ccp/ccp-dmaengine.c
+++ b/kernel/drivers/crypto/ccp/ccp-dmaengine.c
@@ -1,17 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* 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>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
+#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
@@ -37,6 +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)
{
@@ -631,6 +633,36 @@
return 0;
}
+static void ccp_dma_release(struct ccp_device *ccp)
+{
+ struct ccp_dma_chan *chan;
+ struct dma_chan *dma_chan;
+ unsigned int i;
+
+ for (i = 0; i < ccp->cmd_q_count; i++) {
+ chan = ccp->ccp_dma_chan + i;
+ dma_chan = &chan->dma_chan;
+
+ tasklet_kill(&chan->cleanup_tasklet);
+ list_del_rcu(&dma_chan->device_node);
+ }
+}
+
+static void ccp_dma_release_channels(struct ccp_device *ccp)
+{
+ struct ccp_dma_chan *chan;
+ struct dma_chan *dma_chan;
+ unsigned int i;
+
+ for (i = 0; i < ccp->cmd_q_count; i++) {
+ chan = ccp->ccp_dma_chan + i;
+ dma_chan = &chan->dma_chan;
+
+ if (dma_chan->client_count)
+ dma_release_channel(dma_chan);
+ }
+}
+
int ccp_dmaengine_register(struct ccp_device *ccp)
{
struct ccp_dma_chan *chan;
@@ -640,6 +672,9 @@
char *dma_desc_cache_name;
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)),
@@ -732,6 +767,7 @@
return 0;
err_reg:
+ ccp_dma_release(ccp);
kmem_cache_destroy(ccp->dma_desc_cache);
err_cache:
@@ -744,7 +780,12 @@
{
struct dma_device *dma_dev = &ccp->dma_dev;
+ if (!dmaengine)
+ return;
+
+ ccp_dma_release_channels(ccp);
dma_async_device_unregister(dma_dev);
+ ccp_dma_release(ccp);
kmem_cache_destroy(ccp->dma_desc_cache);
kmem_cache_destroy(ccp->dma_cmd_cache);
--
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