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![Jens Wiklander](/assets/img/avatar_default.png)
Mirrors the TEE_DESC_PRIVILEGED bit of struct tee_desc:flags into struct tee_ioctl_version_data:gen_caps as TEE_GEN_CAP_PRIVILEGED in tee_ioctl_version() Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
898 lines
22 KiB
C
898 lines
22 KiB
C
/*
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* Copyright (c) 2015-2016, Linaro Limited
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/cdev.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/idr.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/tee_drv.h>
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#include <linux/uaccess.h>
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#include "tee_private.h"
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#define TEE_NUM_DEVICES 32
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#define TEE_IOCTL_PARAM_SIZE(x) (sizeof(struct tee_param) * (x))
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/*
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* Unprivileged devices in the lower half range and privileged devices in
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* the upper half range.
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*/
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static DECLARE_BITMAP(dev_mask, TEE_NUM_DEVICES);
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static DEFINE_SPINLOCK(driver_lock);
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static struct class *tee_class;
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static dev_t tee_devt;
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static int tee_open(struct inode *inode, struct file *filp)
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{
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int rc;
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struct tee_device *teedev;
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struct tee_context *ctx;
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teedev = container_of(inode->i_cdev, struct tee_device, cdev);
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if (!tee_device_get(teedev))
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return -EINVAL;
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ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
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if (!ctx) {
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rc = -ENOMEM;
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goto err;
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}
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ctx->teedev = teedev;
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INIT_LIST_HEAD(&ctx->list_shm);
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filp->private_data = ctx;
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rc = teedev->desc->ops->open(ctx);
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if (rc)
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goto err;
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return 0;
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err:
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kfree(ctx);
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tee_device_put(teedev);
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return rc;
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}
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static int tee_release(struct inode *inode, struct file *filp)
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{
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struct tee_context *ctx = filp->private_data;
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struct tee_device *teedev = ctx->teedev;
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struct tee_shm *shm;
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ctx->teedev->desc->ops->release(ctx);
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mutex_lock(&ctx->teedev->mutex);
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list_for_each_entry(shm, &ctx->list_shm, link)
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shm->ctx = NULL;
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mutex_unlock(&ctx->teedev->mutex);
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kfree(ctx);
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tee_device_put(teedev);
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return 0;
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}
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static int tee_ioctl_version(struct tee_context *ctx,
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struct tee_ioctl_version_data __user *uvers)
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{
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struct tee_ioctl_version_data vers;
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ctx->teedev->desc->ops->get_version(ctx->teedev, &vers);
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if (ctx->teedev->desc->flags & TEE_DESC_PRIVILEGED)
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vers.gen_caps |= TEE_GEN_CAP_PRIVILEGED;
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if (copy_to_user(uvers, &vers, sizeof(vers)))
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return -EFAULT;
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return 0;
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}
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static int tee_ioctl_shm_alloc(struct tee_context *ctx,
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struct tee_ioctl_shm_alloc_data __user *udata)
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{
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long ret;
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struct tee_ioctl_shm_alloc_data data;
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struct tee_shm *shm;
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if (copy_from_user(&data, udata, sizeof(data)))
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return -EFAULT;
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/* Currently no input flags are supported */
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if (data.flags)
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return -EINVAL;
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data.id = -1;
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shm = tee_shm_alloc(ctx, data.size, TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
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if (IS_ERR(shm))
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return PTR_ERR(shm);
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data.id = shm->id;
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data.flags = shm->flags;
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data.size = shm->size;
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if (copy_to_user(udata, &data, sizeof(data)))
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ret = -EFAULT;
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else
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ret = tee_shm_get_fd(shm);
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/*
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* When user space closes the file descriptor the shared memory
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* should be freed or if tee_shm_get_fd() failed then it will
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* be freed immediately.
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*/
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tee_shm_put(shm);
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return ret;
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}
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static int params_from_user(struct tee_context *ctx, struct tee_param *params,
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size_t num_params,
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struct tee_ioctl_param __user *uparams)
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{
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size_t n;
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for (n = 0; n < num_params; n++) {
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struct tee_shm *shm;
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struct tee_ioctl_param ip;
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if (copy_from_user(&ip, uparams + n, sizeof(ip)))
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return -EFAULT;
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/* All unused attribute bits has to be zero */
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if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_TYPE_MASK)
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return -EINVAL;
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params[n].attr = ip.attr;
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switch (ip.attr) {
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case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
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case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
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break;
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case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
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case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
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params[n].u.value.a = ip.a;
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params[n].u.value.b = ip.b;
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params[n].u.value.c = ip.c;
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break;
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
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/*
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* If we fail to get a pointer to a shared memory
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* object (and increase the ref count) from an
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* identifier we return an error. All pointers that
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* has been added in params have an increased ref
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* count. It's the callers responibility to do
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* tee_shm_put() on all resolved pointers.
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*/
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shm = tee_shm_get_from_id(ctx, ip.c);
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if (IS_ERR(shm))
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return PTR_ERR(shm);
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params[n].u.memref.shm_offs = ip.a;
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params[n].u.memref.size = ip.b;
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params[n].u.memref.shm = shm;
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break;
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default:
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/* Unknown attribute */
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return -EINVAL;
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}
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}
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return 0;
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}
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static int params_to_user(struct tee_ioctl_param __user *uparams,
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size_t num_params, struct tee_param *params)
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{
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size_t n;
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for (n = 0; n < num_params; n++) {
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struct tee_ioctl_param __user *up = uparams + n;
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struct tee_param *p = params + n;
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switch (p->attr) {
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case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
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case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
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if (put_user(p->u.value.a, &up->a) ||
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put_user(p->u.value.b, &up->b) ||
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put_user(p->u.value.c, &up->c))
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return -EFAULT;
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break;
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
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if (put_user((u64)p->u.memref.size, &up->b))
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return -EFAULT;
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default:
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break;
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}
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}
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return 0;
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}
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static bool param_is_memref(struct tee_param *param)
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{
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switch (param->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
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return true;
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default:
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return false;
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}
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}
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static int tee_ioctl_open_session(struct tee_context *ctx,
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struct tee_ioctl_buf_data __user *ubuf)
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{
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int rc;
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size_t n;
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struct tee_ioctl_buf_data buf;
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struct tee_ioctl_open_session_arg __user *uarg;
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struct tee_ioctl_open_session_arg arg;
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struct tee_ioctl_param __user *uparams = NULL;
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struct tee_param *params = NULL;
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bool have_session = false;
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if (!ctx->teedev->desc->ops->open_session)
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return -EINVAL;
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if (copy_from_user(&buf, ubuf, sizeof(buf)))
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return -EFAULT;
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if (buf.buf_len > TEE_MAX_ARG_SIZE ||
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buf.buf_len < sizeof(struct tee_ioctl_open_session_arg))
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return -EINVAL;
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uarg = u64_to_user_ptr(buf.buf_ptr);
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if (copy_from_user(&arg, uarg, sizeof(arg)))
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return -EFAULT;
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if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
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return -EINVAL;
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if (arg.num_params) {
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params = kcalloc(arg.num_params, sizeof(struct tee_param),
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GFP_KERNEL);
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if (!params)
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return -ENOMEM;
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uparams = uarg->params;
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rc = params_from_user(ctx, params, arg.num_params, uparams);
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if (rc)
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goto out;
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}
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rc = ctx->teedev->desc->ops->open_session(ctx, &arg, params);
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if (rc)
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goto out;
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have_session = true;
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if (put_user(arg.session, &uarg->session) ||
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put_user(arg.ret, &uarg->ret) ||
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put_user(arg.ret_origin, &uarg->ret_origin)) {
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rc = -EFAULT;
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goto out;
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}
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rc = params_to_user(uparams, arg.num_params, params);
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out:
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/*
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* If we've succeeded to open the session but failed to communicate
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* it back to user space, close the session again to avoid leakage.
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*/
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if (rc && have_session && ctx->teedev->desc->ops->close_session)
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ctx->teedev->desc->ops->close_session(ctx, arg.session);
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if (params) {
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/* Decrease ref count for all valid shared memory pointers */
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for (n = 0; n < arg.num_params; n++)
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if (param_is_memref(params + n) &&
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params[n].u.memref.shm)
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tee_shm_put(params[n].u.memref.shm);
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kfree(params);
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}
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return rc;
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}
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static int tee_ioctl_invoke(struct tee_context *ctx,
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struct tee_ioctl_buf_data __user *ubuf)
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{
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int rc;
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size_t n;
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struct tee_ioctl_buf_data buf;
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struct tee_ioctl_invoke_arg __user *uarg;
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struct tee_ioctl_invoke_arg arg;
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struct tee_ioctl_param __user *uparams = NULL;
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struct tee_param *params = NULL;
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if (!ctx->teedev->desc->ops->invoke_func)
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return -EINVAL;
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if (copy_from_user(&buf, ubuf, sizeof(buf)))
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return -EFAULT;
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if (buf.buf_len > TEE_MAX_ARG_SIZE ||
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buf.buf_len < sizeof(struct tee_ioctl_invoke_arg))
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return -EINVAL;
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uarg = u64_to_user_ptr(buf.buf_ptr);
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if (copy_from_user(&arg, uarg, sizeof(arg)))
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return -EFAULT;
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if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
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return -EINVAL;
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if (arg.num_params) {
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params = kcalloc(arg.num_params, sizeof(struct tee_param),
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GFP_KERNEL);
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if (!params)
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return -ENOMEM;
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uparams = uarg->params;
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rc = params_from_user(ctx, params, arg.num_params, uparams);
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if (rc)
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goto out;
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}
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rc = ctx->teedev->desc->ops->invoke_func(ctx, &arg, params);
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if (rc)
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goto out;
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if (put_user(arg.ret, &uarg->ret) ||
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put_user(arg.ret_origin, &uarg->ret_origin)) {
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rc = -EFAULT;
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goto out;
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}
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rc = params_to_user(uparams, arg.num_params, params);
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out:
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if (params) {
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/* Decrease ref count for all valid shared memory pointers */
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for (n = 0; n < arg.num_params; n++)
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if (param_is_memref(params + n) &&
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params[n].u.memref.shm)
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tee_shm_put(params[n].u.memref.shm);
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kfree(params);
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}
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return rc;
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}
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static int tee_ioctl_cancel(struct tee_context *ctx,
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struct tee_ioctl_cancel_arg __user *uarg)
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{
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struct tee_ioctl_cancel_arg arg;
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if (!ctx->teedev->desc->ops->cancel_req)
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return -EINVAL;
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if (copy_from_user(&arg, uarg, sizeof(arg)))
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return -EFAULT;
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return ctx->teedev->desc->ops->cancel_req(ctx, arg.cancel_id,
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arg.session);
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}
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static int
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tee_ioctl_close_session(struct tee_context *ctx,
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struct tee_ioctl_close_session_arg __user *uarg)
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{
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struct tee_ioctl_close_session_arg arg;
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if (!ctx->teedev->desc->ops->close_session)
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return -EINVAL;
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if (copy_from_user(&arg, uarg, sizeof(arg)))
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return -EFAULT;
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return ctx->teedev->desc->ops->close_session(ctx, arg.session);
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}
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static int params_to_supp(struct tee_context *ctx,
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struct tee_ioctl_param __user *uparams,
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size_t num_params, struct tee_param *params)
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{
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size_t n;
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for (n = 0; n < num_params; n++) {
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struct tee_ioctl_param ip;
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struct tee_param *p = params + n;
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ip.attr = p->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK;
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switch (p->attr) {
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case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
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case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
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ip.a = p->u.value.a;
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ip.b = p->u.value.b;
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ip.c = p->u.value.c;
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break;
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
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ip.b = p->u.memref.size;
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if (!p->u.memref.shm) {
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ip.a = 0;
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ip.c = (u64)-1; /* invalid shm id */
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break;
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}
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ip.a = p->u.memref.shm_offs;
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ip.c = p->u.memref.shm->id;
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break;
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default:
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ip.a = 0;
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ip.b = 0;
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ip.c = 0;
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break;
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}
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if (copy_to_user(uparams + n, &ip, sizeof(ip)))
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return -EFAULT;
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}
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return 0;
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}
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static int tee_ioctl_supp_recv(struct tee_context *ctx,
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struct tee_ioctl_buf_data __user *ubuf)
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{
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int rc;
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struct tee_ioctl_buf_data buf;
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struct tee_iocl_supp_recv_arg __user *uarg;
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struct tee_param *params;
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u32 num_params;
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u32 func;
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if (!ctx->teedev->desc->ops->supp_recv)
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return -EINVAL;
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if (copy_from_user(&buf, ubuf, sizeof(buf)))
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return -EFAULT;
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if (buf.buf_len > TEE_MAX_ARG_SIZE ||
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buf.buf_len < sizeof(struct tee_iocl_supp_recv_arg))
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return -EINVAL;
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uarg = u64_to_user_ptr(buf.buf_ptr);
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if (get_user(num_params, &uarg->num_params))
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return -EFAULT;
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if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) != buf.buf_len)
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return -EINVAL;
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params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
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if (!params)
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return -ENOMEM;
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rc = ctx->teedev->desc->ops->supp_recv(ctx, &func, &num_params, params);
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if (rc)
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goto out;
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if (put_user(func, &uarg->func) ||
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put_user(num_params, &uarg->num_params)) {
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rc = -EFAULT;
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goto out;
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}
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rc = params_to_supp(ctx, uarg->params, num_params, params);
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out:
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kfree(params);
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return rc;
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}
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static int params_from_supp(struct tee_param *params, size_t num_params,
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struct tee_ioctl_param __user *uparams)
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{
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size_t n;
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for (n = 0; n < num_params; n++) {
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struct tee_param *p = params + n;
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struct tee_ioctl_param ip;
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if (copy_from_user(&ip, uparams + n, sizeof(ip)))
|
|
return -EFAULT;
|
|
|
|
/* All unused attribute bits has to be zero */
|
|
if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_TYPE_MASK)
|
|
return -EINVAL;
|
|
|
|
p->attr = ip.attr;
|
|
switch (ip.attr) {
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
|
|
/* Only out and in/out values can be updated */
|
|
p->u.value.a = ip.a;
|
|
p->u.value.b = ip.b;
|
|
p->u.value.c = ip.c;
|
|
break;
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
|
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
|
|
/*
|
|
* Only the size of the memref can be updated.
|
|
* Since we don't have access to the original
|
|
* parameters here, only store the supplied size.
|
|
* The driver will copy the updated size into the
|
|
* original parameters.
|
|
*/
|
|
p->u.memref.shm = NULL;
|
|
p->u.memref.shm_offs = 0;
|
|
p->u.memref.size = ip.b;
|
|
break;
|
|
default:
|
|
memset(&p->u, 0, sizeof(p->u));
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int tee_ioctl_supp_send(struct tee_context *ctx,
|
|
struct tee_ioctl_buf_data __user *ubuf)
|
|
{
|
|
long rc;
|
|
struct tee_ioctl_buf_data buf;
|
|
struct tee_iocl_supp_send_arg __user *uarg;
|
|
struct tee_param *params;
|
|
u32 num_params;
|
|
u32 ret;
|
|
|
|
/* Not valid for this driver */
|
|
if (!ctx->teedev->desc->ops->supp_send)
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&buf, ubuf, sizeof(buf)))
|
|
return -EFAULT;
|
|
|
|
if (buf.buf_len > TEE_MAX_ARG_SIZE ||
|
|
buf.buf_len < sizeof(struct tee_iocl_supp_send_arg))
|
|
return -EINVAL;
|
|
|
|
uarg = u64_to_user_ptr(buf.buf_ptr);
|
|
if (get_user(ret, &uarg->ret) ||
|
|
get_user(num_params, &uarg->num_params))
|
|
return -EFAULT;
|
|
|
|
if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) > buf.buf_len)
|
|
return -EINVAL;
|
|
|
|
params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
|
|
if (!params)
|
|
return -ENOMEM;
|
|
|
|
rc = params_from_supp(params, num_params, uarg->params);
|
|
if (rc)
|
|
goto out;
|
|
|
|
rc = ctx->teedev->desc->ops->supp_send(ctx, ret, num_params, params);
|
|
out:
|
|
kfree(params);
|
|
return rc;
|
|
}
|
|
|
|
static long tee_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct tee_context *ctx = filp->private_data;
|
|
void __user *uarg = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case TEE_IOC_VERSION:
|
|
return tee_ioctl_version(ctx, uarg);
|
|
case TEE_IOC_SHM_ALLOC:
|
|
return tee_ioctl_shm_alloc(ctx, uarg);
|
|
case TEE_IOC_OPEN_SESSION:
|
|
return tee_ioctl_open_session(ctx, uarg);
|
|
case TEE_IOC_INVOKE:
|
|
return tee_ioctl_invoke(ctx, uarg);
|
|
case TEE_IOC_CANCEL:
|
|
return tee_ioctl_cancel(ctx, uarg);
|
|
case TEE_IOC_CLOSE_SESSION:
|
|
return tee_ioctl_close_session(ctx, uarg);
|
|
case TEE_IOC_SUPPL_RECV:
|
|
return tee_ioctl_supp_recv(ctx, uarg);
|
|
case TEE_IOC_SUPPL_SEND:
|
|
return tee_ioctl_supp_send(ctx, uarg);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static const struct file_operations tee_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = tee_open,
|
|
.release = tee_release,
|
|
.unlocked_ioctl = tee_ioctl,
|
|
.compat_ioctl = tee_ioctl,
|
|
};
|
|
|
|
static void tee_release_device(struct device *dev)
|
|
{
|
|
struct tee_device *teedev = container_of(dev, struct tee_device, dev);
|
|
|
|
spin_lock(&driver_lock);
|
|
clear_bit(teedev->id, dev_mask);
|
|
spin_unlock(&driver_lock);
|
|
mutex_destroy(&teedev->mutex);
|
|
idr_destroy(&teedev->idr);
|
|
kfree(teedev);
|
|
}
|
|
|
|
/**
|
|
* tee_device_alloc() - Allocate a new struct tee_device instance
|
|
* @teedesc: Descriptor for this driver
|
|
* @dev: Parent device for this device
|
|
* @pool: Shared memory pool, NULL if not used
|
|
* @driver_data: Private driver data for this device
|
|
*
|
|
* Allocates a new struct tee_device instance. The device is
|
|
* removed by tee_device_unregister().
|
|
*
|
|
* @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure
|
|
*/
|
|
struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
|
|
struct device *dev,
|
|
struct tee_shm_pool *pool,
|
|
void *driver_data)
|
|
{
|
|
struct tee_device *teedev;
|
|
void *ret;
|
|
int rc;
|
|
int offs = 0;
|
|
|
|
if (!teedesc || !teedesc->name || !teedesc->ops ||
|
|
!teedesc->ops->get_version || !teedesc->ops->open ||
|
|
!teedesc->ops->release || !pool)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
teedev = kzalloc(sizeof(*teedev), GFP_KERNEL);
|
|
if (!teedev) {
|
|
ret = ERR_PTR(-ENOMEM);
|
|
goto err;
|
|
}
|
|
|
|
if (teedesc->flags & TEE_DESC_PRIVILEGED)
|
|
offs = TEE_NUM_DEVICES / 2;
|
|
|
|
spin_lock(&driver_lock);
|
|
teedev->id = find_next_zero_bit(dev_mask, TEE_NUM_DEVICES, offs);
|
|
if (teedev->id < TEE_NUM_DEVICES)
|
|
set_bit(teedev->id, dev_mask);
|
|
spin_unlock(&driver_lock);
|
|
|
|
if (teedev->id >= TEE_NUM_DEVICES) {
|
|
ret = ERR_PTR(-ENOMEM);
|
|
goto err;
|
|
}
|
|
|
|
snprintf(teedev->name, sizeof(teedev->name), "tee%s%d",
|
|
teedesc->flags & TEE_DESC_PRIVILEGED ? "priv" : "",
|
|
teedev->id - offs);
|
|
|
|
teedev->dev.class = tee_class;
|
|
teedev->dev.release = tee_release_device;
|
|
teedev->dev.parent = dev;
|
|
|
|
teedev->dev.devt = MKDEV(MAJOR(tee_devt), teedev->id);
|
|
|
|
rc = dev_set_name(&teedev->dev, "%s", teedev->name);
|
|
if (rc) {
|
|
ret = ERR_PTR(rc);
|
|
goto err_devt;
|
|
}
|
|
|
|
cdev_init(&teedev->cdev, &tee_fops);
|
|
teedev->cdev.owner = teedesc->owner;
|
|
teedev->cdev.kobj.parent = &teedev->dev.kobj;
|
|
|
|
dev_set_drvdata(&teedev->dev, driver_data);
|
|
device_initialize(&teedev->dev);
|
|
|
|
/* 1 as tee_device_unregister() does one final tee_device_put() */
|
|
teedev->num_users = 1;
|
|
init_completion(&teedev->c_no_users);
|
|
mutex_init(&teedev->mutex);
|
|
idr_init(&teedev->idr);
|
|
|
|
teedev->desc = teedesc;
|
|
teedev->pool = pool;
|
|
|
|
return teedev;
|
|
err_devt:
|
|
unregister_chrdev_region(teedev->dev.devt, 1);
|
|
err:
|
|
pr_err("could not register %s driver\n",
|
|
teedesc->flags & TEE_DESC_PRIVILEGED ? "privileged" : "client");
|
|
if (teedev && teedev->id < TEE_NUM_DEVICES) {
|
|
spin_lock(&driver_lock);
|
|
clear_bit(teedev->id, dev_mask);
|
|
spin_unlock(&driver_lock);
|
|
}
|
|
kfree(teedev);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_device_alloc);
|
|
|
|
static ssize_t implementation_id_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct tee_device *teedev = container_of(dev, struct tee_device, dev);
|
|
struct tee_ioctl_version_data vers;
|
|
|
|
teedev->desc->ops->get_version(teedev, &vers);
|
|
return scnprintf(buf, PAGE_SIZE, "%d\n", vers.impl_id);
|
|
}
|
|
static DEVICE_ATTR_RO(implementation_id);
|
|
|
|
static struct attribute *tee_dev_attrs[] = {
|
|
&dev_attr_implementation_id.attr,
|
|
NULL
|
|
};
|
|
|
|
static const struct attribute_group tee_dev_group = {
|
|
.attrs = tee_dev_attrs,
|
|
};
|
|
|
|
/**
|
|
* tee_device_register() - Registers a TEE device
|
|
* @teedev: Device to register
|
|
*
|
|
* tee_device_unregister() need to be called to remove the @teedev if
|
|
* this function fails.
|
|
*
|
|
* @returns < 0 on failure
|
|
*/
|
|
int tee_device_register(struct tee_device *teedev)
|
|
{
|
|
int rc;
|
|
|
|
if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) {
|
|
dev_err(&teedev->dev, "attempt to register twice\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = cdev_add(&teedev->cdev, teedev->dev.devt, 1);
|
|
if (rc) {
|
|
dev_err(&teedev->dev,
|
|
"unable to cdev_add() %s, major %d, minor %d, err=%d\n",
|
|
teedev->name, MAJOR(teedev->dev.devt),
|
|
MINOR(teedev->dev.devt), rc);
|
|
return rc;
|
|
}
|
|
|
|
rc = device_add(&teedev->dev);
|
|
if (rc) {
|
|
dev_err(&teedev->dev,
|
|
"unable to device_add() %s, major %d, minor %d, err=%d\n",
|
|
teedev->name, MAJOR(teedev->dev.devt),
|
|
MINOR(teedev->dev.devt), rc);
|
|
goto err_device_add;
|
|
}
|
|
|
|
rc = sysfs_create_group(&teedev->dev.kobj, &tee_dev_group);
|
|
if (rc) {
|
|
dev_err(&teedev->dev,
|
|
"failed to create sysfs attributes, err=%d\n", rc);
|
|
goto err_sysfs_create_group;
|
|
}
|
|
|
|
teedev->flags |= TEE_DEVICE_FLAG_REGISTERED;
|
|
return 0;
|
|
|
|
err_sysfs_create_group:
|
|
device_del(&teedev->dev);
|
|
err_device_add:
|
|
cdev_del(&teedev->cdev);
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_device_register);
|
|
|
|
void tee_device_put(struct tee_device *teedev)
|
|
{
|
|
mutex_lock(&teedev->mutex);
|
|
/* Shouldn't put in this state */
|
|
if (!WARN_ON(!teedev->desc)) {
|
|
teedev->num_users--;
|
|
if (!teedev->num_users) {
|
|
teedev->desc = NULL;
|
|
complete(&teedev->c_no_users);
|
|
}
|
|
}
|
|
mutex_unlock(&teedev->mutex);
|
|
}
|
|
|
|
bool tee_device_get(struct tee_device *teedev)
|
|
{
|
|
mutex_lock(&teedev->mutex);
|
|
if (!teedev->desc) {
|
|
mutex_unlock(&teedev->mutex);
|
|
return false;
|
|
}
|
|
teedev->num_users++;
|
|
mutex_unlock(&teedev->mutex);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tee_device_unregister() - Removes a TEE device
|
|
* @teedev: Device to unregister
|
|
*
|
|
* This function should be called to remove the @teedev even if
|
|
* tee_device_register() hasn't been called yet. Does nothing if
|
|
* @teedev is NULL.
|
|
*/
|
|
void tee_device_unregister(struct tee_device *teedev)
|
|
{
|
|
if (!teedev)
|
|
return;
|
|
|
|
if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) {
|
|
sysfs_remove_group(&teedev->dev.kobj, &tee_dev_group);
|
|
cdev_del(&teedev->cdev);
|
|
device_del(&teedev->dev);
|
|
}
|
|
|
|
tee_device_put(teedev);
|
|
wait_for_completion(&teedev->c_no_users);
|
|
|
|
/*
|
|
* No need to take a mutex any longer now since teedev->desc was
|
|
* set to NULL before teedev->c_no_users was completed.
|
|
*/
|
|
|
|
teedev->pool = NULL;
|
|
|
|
put_device(&teedev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_device_unregister);
|
|
|
|
/**
|
|
* tee_get_drvdata() - Return driver_data pointer
|
|
* @teedev: Device containing the driver_data pointer
|
|
* @returns the driver_data pointer supplied to tee_register().
|
|
*/
|
|
void *tee_get_drvdata(struct tee_device *teedev)
|
|
{
|
|
return dev_get_drvdata(&teedev->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(tee_get_drvdata);
|
|
|
|
static int __init tee_init(void)
|
|
{
|
|
int rc;
|
|
|
|
tee_class = class_create(THIS_MODULE, "tee");
|
|
if (IS_ERR(tee_class)) {
|
|
pr_err("couldn't create class\n");
|
|
return PTR_ERR(tee_class);
|
|
}
|
|
|
|
rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee");
|
|
if (rc) {
|
|
pr_err("failed to allocate char dev region\n");
|
|
class_destroy(tee_class);
|
|
tee_class = NULL;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void __exit tee_exit(void)
|
|
{
|
|
class_destroy(tee_class);
|
|
tee_class = NULL;
|
|
unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
|
|
}
|
|
|
|
subsys_initcall(tee_init);
|
|
module_exit(tee_exit);
|
|
|
|
MODULE_AUTHOR("Linaro");
|
|
MODULE_DESCRIPTION("TEE Driver");
|
|
MODULE_VERSION("1.0");
|
|
MODULE_LICENSE("GPL v2");
|