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authorJens Wiklander <jens.wiklander@linaro.org>2018-07-09 09:15:49 +0300
committerJens Wiklander <jens.wiklander@linaro.org>2018-08-24 12:57:37 +0300
commit25559c22cef879c5cf7119540bfe21fb379d29f3 (patch)
tree5c153a341397502a1267a4a23a92a197f5d48229 /drivers/tee
parentdb878f76b9ff7487da9bb0f686153f81829f1230 (diff)
downloadlinux-25559c22cef879c5cf7119540bfe21fb379d29f3.tar.xz
tee: add kernel internal client interface
Adds a kernel internal TEE client interface to be used by other drivers. Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Tested-by: Sumit Garg <sumit.garg@linaro.org> Tested-by: Zeng Tao <prime.zeng@hisilicon.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'drivers/tee')
-rw-r--r--drivers/tee/tee_core.c113
1 files changed, 106 insertions, 7 deletions
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
index dd46b758852a..7b2bb4c50058 100644
--- a/drivers/tee/tee_core.c
+++ b/drivers/tee/tee_core.c
@@ -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;