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esm: configurate DAM of HDCP correctly

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PD#146713: configurate DMA of HDCP correctly

1.In kernel 4.9, before DMA operation, of_dma_configure function must
be used. Otherwise, it will get a NULL pointer and result in a kernel
crash.

2.For secure reasons, node '/dev/mem' has gone away. But for esm, there
still need this feature for debug. So add a new blob for esay dump:
 dd if=/sys/kernel/debug/esm/blob of=/UPATH/esmmem.

Change-Id: Id86cc88227bf2d14aca3e3d323da32853a46e37f
Signed-off-by: Yi Zhou <yi.zhou@amlogic.com>
This commit is contained in:
Yi Zhou
2017-08-09 11:54:37 +08:00
committed by Jianxin Pan
parent 937de4a48b
commit 0cdc347d45
1 changed files with 27 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/amlogic/esm/hdcp_main.c
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@@ -35,6 +35,8 @@
#include <linux/uaccess.h>
#include <linux/fs.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <linux/debugfs.h>
#include "host_lib_driver_linux_if.h"
@@ -61,9 +63,11 @@ struct esm_device {
dma_addr_t data_base;
uint32_t data_size;
uint8_t *data;
struct debugfs_blob_wrapper blob;
struct resource *hpi_resource;
uint8_t __iomem *hpi;
struct device esm_code_dev;
struct device esm_data_dev;
};
static struct esm_device esm_devices[MAX_ESM_DEVICES];
@@ -228,6 +232,9 @@ static struct esm_device *alloc_esm_slot(const struct esm_ioc_meminfo *info)
return NULL;
}
static struct dentry *esm_debugfs;
static struct dentry *esm_blob;
static void free_dma_areas(struct esm_device *esm)
{
if (!esm->code_is_phys_mem && esm->code) {
@@ -241,6 +248,8 @@ static void free_dma_areas(struct esm_device *esm)
esm->data_base);
esm->data = NULL;
}
debugfs_remove_recursive(esm_debugfs);
}
static int alloc_dma_areas(struct esm_device *esm,
@@ -254,10 +263,14 @@ static int alloc_dma_areas(struct esm_device *esm,
esm->code_base = info->code_base;
esm->code = phys_to_virt(esm->code_base);
} else {
esm->code = dma_alloc_coherent((struct device *)esm,
of_dma_configure(&esm->esm_code_dev, esm->esm_code_dev.of_node);
esm->code = dma_alloc_coherent(&esm->esm_code_dev,
esm->code_size, &esm->code_base, GFP_KERNEL);
if (!esm->code)
pr_info("the esm code address is %p\n", esm->code);
if (!esm->code) {
free_dma_areas(esm);
return -ENOMEM;
}
}
esm->data_size = info->data_size;
@@ -267,13 +280,23 @@ static int alloc_dma_areas(struct esm_device *esm,
esm->data_base = info->data_base;
esm->data = phys_to_virt(esm->data_base);
} else {
esm->data = dma_alloc_coherent((struct device *)esm,
of_dma_configure(&esm->esm_data_dev, esm->esm_data_dev.of_node);
esm->data = dma_alloc_coherent(&esm->esm_data_dev,
esm->data_size, &esm->data_base, GFP_KERNEL);
pr_info("the esm data address is %p\n", esm->data);
if (!esm->data) {
free_dma_areas(esm);
return -ENOMEM;
}
}
/* add blob note to show esm feature and debug*/
esm_debugfs = debugfs_create_dir("esm", NULL);
if (!esm_debugfs)
return -ENOENT;
esm->blob.data = (void *)esm->code;
esm->blob.size = esm->code_size;
esm_blob = debugfs_create_blob("blob", 0644, esm_debugfs, &esm->blob);
if (randomize_mem) {
prandom_bytes(esm->code, esm->code_size);