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tee: add kernel internal client interface

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Adds a kernel internal TEE client interface to be used by other drivers.

Reviewed-by: Sumit Garg <[email protected]>
Tested-by: Sumit Garg <[email protected]>
Tested-by: Zeng Tao <[email protected]>
Signed-off-by: Jens Wiklander <[email protected]>
This commit is contained in:
Jens Wiklander 2018-07-09 08:15:49 +02:00
commit 25559c22ce
2 changed files with 179 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

113
drivers/tee/tee_core.c
View file

@ -38,15 +38,13 @@ static DEFINE_SPINLOCK(driver_lock);
static struct class *tee_class;
static dev_t tee_devt;
static int tee_open(struct inode *inode, struct file *filp)
static struct tee_context *teedev_open(struct tee_device *teedev)
{
int rc;
struct tee_device *teedev;
struct tee_context *ctx;
teedev = container_of(inode->i_cdev, struct tee_device, cdev);
if (!tee_device_get(teedev))
return -EINVAL;
return ERR_PTR(-EINVAL);
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx) {
@ -57,16 +55,16 @@ static int tee_open(struct inode *inode, struct file *filp)
kref_init(&ctx->refcount);
ctx->teedev = teedev;
INIT_LIST_HEAD(&ctx->list_shm);
filp->private_data = ctx;
rc = teedev->desc->ops->open(ctx);
if (rc)
goto err;
return 0;
return ctx;
err:
kfree(ctx);
tee_device_put(teedev);
return rc;
return ERR_PTR(rc);
}
void teedev_ctx_get(struct tee_context *ctx)
@ -100,6 +98,18 @@ static void teedev_close_context(struct tee_context *ctx)
teedev_ctx_put(ctx);
}
static int tee_open(struct inode *inode, struct file *filp)
{
struct tee_context *ctx;
ctx = teedev_open(container_of(inode->i_cdev, struct tee_device, cdev));
if (IS_ERR(ctx))
return PTR_ERR(ctx);
filp->private_data = ctx;
return 0;
}
static int tee_release(struct inode *inode, struct file *filp)
{
teedev_close_context(filp->private_data);
@ -928,6 +938,95 @@ void *tee_get_drvdata(struct tee_device *teedev)
}
EXPORT_SYMBOL_GPL(tee_get_drvdata);
struct match_dev_data {
struct tee_ioctl_version_data *vers;
const void *data;
int (*match)(struct tee_ioctl_version_data *, const void *);
};
static int match_dev(struct device *dev, const void *data)
{
const struct match_dev_data *match_data = data;
struct tee_device *teedev = container_of(dev, struct tee_device, dev);
teedev->desc->ops->get_version(teedev, match_data->vers);
return match_data->match(match_data->vers, match_data->data);
}
struct tee_context *
tee_client_open_context(struct tee_context *start,
int (*match)(struct tee_ioctl_version_data *,
const void *),
const void *data, struct tee_ioctl_version_data *vers)
{
struct device *dev = NULL;
struct device *put_dev = NULL;
struct tee_context *ctx = NULL;
struct tee_ioctl_version_data v;
struct match_dev_data match_data = { vers ? vers : &v, data, match };
if (start)
dev = &start->teedev->dev;
do {
dev = class_find_device(tee_class, dev, &match_data, match_dev);
if (!dev) {
ctx = ERR_PTR(-ENOENT);
break;
}
put_device(put_dev);
put_dev = dev;
ctx = teedev_open(container_of(dev, struct tee_device, dev));
} while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM);
put_device(put_dev);
return ctx;
}
EXPORT_SYMBOL_GPL(tee_client_open_context);
void tee_client_close_context(struct tee_context *ctx)
{
teedev_close_context(ctx);
}
EXPORT_SYMBOL_GPL(tee_client_close_context);
void tee_client_get_version(struct tee_context *ctx,
struct tee_ioctl_version_data *vers)
{
ctx->teedev->desc->ops->get_version(ctx->teedev, vers);
}
EXPORT_SYMBOL_GPL(tee_client_get_version);
int tee_client_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param)
{
if (!ctx->teedev->desc->ops->open_session)
return -EINVAL;
return ctx->teedev->desc->ops->open_session(ctx, arg, param);
}
EXPORT_SYMBOL_GPL(tee_client_open_session);
int tee_client_close_session(struct tee_context *ctx, u32 session)
{
if (!ctx->teedev->desc->ops->close_session)
return -EINVAL;
return ctx->teedev->desc->ops->close_session(ctx, session);
}
EXPORT_SYMBOL_GPL(tee_client_close_session);
int tee_client_invoke_func(struct tee_context *ctx,
struct tee_ioctl_invoke_arg *arg,
struct tee_param *param)
{
if (!ctx->teedev->desc->ops->invoke_func)
return -EINVAL;
return ctx->teedev->desc->ops->invoke_func(ctx, arg, param);
}
EXPORT_SYMBOL_GPL(tee_client_invoke_func);
static int __init tee_init(void)
{
int rc;