Re: [PATCH v10 2/4] tee: generic TEE subsystem

Javier González
2016-06-06T18:34:43Z

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>
> On 01 Jun 2016, at 14:41, Jens Wiklander <jens.wiklander@linaro.org> wrote:
>
> Initial patch for generic TEE subsystem.
> This subsystem provides:
> * Registration/un-registration of TEE drivers.
> * Shared memory between normal world and secure world.
> * Ioctl interface for interaction with user space.
> * Sysfs implementation_id of TEE driver
>
> A TEE (Trusted Execution Environment) driver is a driver that interfaces
> with a trusted OS running in some secure environment, for example,
> TrustZone on ARM cpus, or a separate secure co-processor etc.
>
> The TEE subsystem can serve a TEE driver for a Global Platform compliant
> TEE, but it's not limited to only Global Platform TEEs.
>
> This patch builds on other similar implementations trying to solve
> the same problem:
> * "optee_linuxdriver" by among others
> Jean-michel DELORME<jean-michel.delorme@st.com> and
> Emmanuel MICHEL <emmanuel.michel@st.com>
> * "Generic TrustZone Driver" by Javier González <javier@javigon.com>
>
> Acked-by: Andreas Dannenberg <dannenberg@ti.com>
> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
> ---
> Documentation/ioctl/ioctl-number.txt | 1 +
> MAINTAINERS | 7 +
> drivers/Kconfig | 2 +
> drivers/Makefile | 1 +
> drivers/tee/Kconfig | 9 +
> drivers/tee/Makefile | 3 +
> drivers/tee/tee.c | 877 +++++++++++++++++++++++++++++++++++
> drivers/tee/tee_private.h | 125 +++++
> drivers/tee/tee_shm.c | 347 ++++++++++++++
> drivers/tee/tee_shm_pool.c | 155 +++++++
> include/linux/tee_drv.h | 273 +++++++++++
> include/uapi/linux/tee.h | 400 ++++++++++++++++
> 12 files changed, 2200 insertions(+)
> create mode 100644 drivers/tee/Kconfig
> create mode 100644 drivers/tee/Makefile
> create mode 100644 drivers/tee/tee.c
> create mode 100644 drivers/tee/tee_private.h
> create mode 100644 drivers/tee/tee_shm.c
> create mode 100644 drivers/tee/tee_shm_pool.c
> create mode 100644 include/linux/tee_drv.h
> create mode 100644 include/uapi/linux/tee.h
>
> diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
> index 9369d3b..ac52b6c 100644
> --- a/Documentation/ioctl/ioctl-number.txt
> +++ b/Documentation/ioctl/ioctl-number.txt
> @@ -307,6 +307,7 @@ Code Seq#(hex) Include File Comments
> 0xA3 80-8F Port ACL in development:
> <mailto:tlewis@mindspring.com>
> 0xA3 90-9F linux/dtlk.h
> +0xA4 00-1F uapi/linux/tee.h Generic TEE subsystem
> 0xAA 00-3F linux/uapi/linux/userfaultfd.h
> 0xAB 00-1F linux/nbd.h
> 0xAC 00-1F linux/raw.h
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7304d2e..802ccf9 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10022,6 +10022,13 @@ F: drivers/hwtracing/stm/
> F: include/linux/stm.h
> F: include/uapi/linux/stm.h
>
> +TEE SUBSYSTEM
> +M: Jens Wiklander <jens.wiklander@linaro.org>
> +S: Maintained
> +F: include/linux/tee_drv.h
> +F: include/uapi/linux/tee.h
> +F: drivers/tee/
> +
> THUNDERBOLT DRIVER
> M: Andreas Noever <andreas.noever@gmail.com>
> S: Maintained
> diff --git a/drivers/Kconfig b/drivers/Kconfig
> index e1e2066..de581c1 100644
> --- a/drivers/Kconfig
> +++ b/drivers/Kconfig
> @@ -202,4 +202,6 @@ source "drivers/hwtracing/intel_th/Kconfig"
>
> source "drivers/fpga/Kconfig"
>
> +source "drivers/tee/Kconfig"
> +
> endmenu
> diff --git a/drivers/Makefile b/drivers/Makefile
> index 0b6f3d6..cd7c40f 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -173,3 +173,4 @@ obj-$(CONFIG_STM) += hwtracing/stm/
> obj-$(CONFIG_ANDROID) += android/
> obj-$(CONFIG_NVMEM) += nvmem/
> obj-$(CONFIG_FPGA) += fpga/
> +obj-$(CONFIG_TEE) += tee/
> diff --git a/drivers/tee/Kconfig b/drivers/tee/Kconfig
> new file mode 100644
> index 0000000..f3ba154
> --- /dev/null
> +++ b/drivers/tee/Kconfig
> @@ -0,0 +1,9 @@
> +# Generic Trusted Execution Environment Configuration
> +config TEE
> + bool "Trusted Execution Environment support"
> + default n
> + select DMA_SHARED_BUFFER
> + select GENERIC_ALLOCATOR
> + help
> + This implements a generic interface towards a Trusted Execution
> + Environment (TEE).
> diff --git a/drivers/tee/Makefile b/drivers/tee/Makefile
> new file mode 100644
> index 0000000..60d2dab
> --- /dev/null
> +++ b/drivers/tee/Makefile
> @@ -0,0 +1,3 @@
> +obj-y += tee.o
> +obj-y += tee_shm.o
> +obj-y += tee_shm_pool.o
> diff --git a/drivers/tee/tee.c b/drivers/tee/tee.c
> new file mode 100644
> index 0000000..119e18e
> --- /dev/null
> +++ b/drivers/tee/tee.c
> @@ -0,0 +1,877 @@
> +/*
> + * Copyright (c) 2015-2016, Linaro Limited
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +#include <linux/cdev.h>
> +#include <linux/device.h>
> +#include <linux/fs.h>
> +#include <linux/idr.h>
> +#include <linux/slab.h>
> +#include <linux/tee_drv.h>
> +#include <linux/uaccess.h>
> +#include "tee_private.h"
> +
> +#define TEE_NUM_DEVICES 32
> +
> +#define TEE_IOCTL_PARAM_SIZE(x) (sizeof(struct tee_param) * (x))
> +
> +/*
> + * Unprivileged devices in the in the lower half range and privileged
> + * devices in the upper half range.
> + */
> +static DECLARE_BITMAP(dev_mask, TEE_NUM_DEVICES);
> +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)
> +{
> + 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;
> +
> + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
> + if (!ctx) {
> + rc = -ENOMEM;
> + goto err;
> + }
> +
> + ctx->teedev = teedev;
> + filp->private_data = ctx;
> + rc = teedev->desc->ops->open(ctx);
> + if (rc)
> + goto err;
> +
> + return 0;
> +err:
> + kfree(ctx);
> + tee_device_put(teedev);
> + return rc;
> +}
> +
> +static int tee_release(struct inode *inode, struct file *filp)
> +{
> + struct tee_context *ctx = filp->private_data;
> + struct tee_device *teedev = ctx->teedev;
> +
> + ctx->teedev->desc->ops->release(ctx);
> + kfree(ctx);
> + tee_device_put(teedev);
> + return 0;
> +}
> +
> +static int tee_ioctl_version(struct tee_context *ctx,
> + struct tee_ioctl_version_data __user *uvers)
> +{
> + struct tee_ioctl_version_data vers;
> +
> + ctx->teedev->desc->ops->get_version(ctx->teedev, &vers);
> + if (copy_to_user(uvers, &vers, sizeof(vers)))
> + return -EFAULT;
> + return 0;
> +}
> +
> +static int tee_ioctl_shm_alloc(struct tee_context *ctx,
> + struct tee_ioctl_shm_alloc_data __user *udata)
> +{
> + long ret;
> + struct tee_ioctl_shm_alloc_data data;
> + struct tee_shm *shm;
> +
> + if (copy_from_user(&data, udata, sizeof(data)))
> + return -EFAULT;
> +
> + /* Currently no input flags are supported */
> + if (data.flags)
> + return -EINVAL;
> +
> + data.id = -1;
> +
> + shm = tee_shm_alloc(ctx->teedev, data.size,
> + TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
> + if (IS_ERR(shm))
> + return PTR_ERR(shm);
> +
> + data.id = shm->id;
> + data.flags = shm->flags;
> + data.size = shm->size;
> +
> + if (copy_to_user(udata, &data, sizeof(data)))
> + ret = -EFAULT;
> + else
> + ret = tee_shm_get_fd(shm);
> +
> + /*
> + * When user space closes the file descriptor the shared memory
> + * should be freed or if tee_shm_get_fd() failed then it will
> + * be freed immediately.
> + */
> + tee_shm_put(shm);
> + return ret;
> +}
> +
> +static int params_from_user(struct tee_context *ctx, struct tee_param *params,
> + size_t num_params,
> + struct tee_ioctl_param __user *uparams)
> +{
> + size_t n;
> +
> + for (n = 0; n < num_params; n++) {
> + struct tee_shm *shm;
> + struct tee_ioctl_param ip;
> +
> + 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;
> +
> + params[n].attr = ip.attr;
> + switch (ip.attr) {
> + case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
> + break;
> + case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
> + params[n].u.value.a = ip.u.value.a;
> + params[n].u.value.b = ip.u.value.b;
> + params[n].u.value.c = ip.u.value.c;
> + break;
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
> + /*
> + * If we fail to get a pointer to a shared memory
> + * object (and increase the ref count) from an
> + * identifier we return an error. All pointers that
> + * has been added in params have an increased ref
> + * count. It's the callers responibility to do
> + * tee_shm_put() on all resolved pointers.
> + */
> + shm = tee_shm_get_from_id(ctx->teedev,
> + ip.u.memref.shm_id);
> + if (IS_ERR(shm))
> + return PTR_ERR(shm);
> +
> + params[n].u.memref.shm_offs = ip.u.memref.shm_offs;
> + params[n].u.memref.size = ip.u.memref.size;
> + params[n].u.memref.shm = shm;
> + break;
> + default:
> + /* Unknown attribute */
> + return -EINVAL;
> + }
> + }
> + return 0;
> +}
> +
> +static int params_to_user(struct tee_ioctl_param __user *uparams,
> + size_t num_params, struct tee_param *params)
> +{
> + size_t n;
> +
> + for (n = 0; n < num_params; n++) {
> + struct tee_ioctl_param __user *up = uparams + n;
> + struct tee_param *p = params + n;
> +
> + switch (p->attr) {
> + case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
> + if (put_user(p->u.value.a, &up->u.value.a) ||
> + put_user(p->u.value.b, &up->u.value.b) ||
> + put_user(p->u.value.c, &up->u.value.c))
> + return -EFAULT;
> + break;
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
> + if (put_user((u64)p->u.memref.size, &up->u.memref.size))
> + return -EFAULT;
> + default:
> + break;
> + }
> + }
> + return 0;
> +}
> +
> +static bool param_is_memref(struct tee_param *param)
> +{
> + switch (param->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
> + return true;
> + default:
> + return false;
> + }
> +}
> +
> +static int tee_ioctl_open_session(struct tee_context *ctx,
> + struct tee_ioctl_buf_data __user *ubuf)
> +{
> + int rc;
> + size_t n;
> + struct tee_ioctl_buf_data buf;
> + struct tee_ioctl_open_session_arg __user *uarg;
> + struct tee_ioctl_open_session_arg arg;
> + struct tee_ioctl_param __user *uparams = NULL;
> + struct tee_param *params = NULL;
> + bool have_session = false;
> +
> + if (!ctx->teedev->desc->ops->open_session)
> + 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_ioctl_open_session_arg))
> + return -EINVAL;
> +
> + uarg = (struct tee_ioctl_open_session_arg __user *)(unsigned long)
> + buf.buf_ptr;
> + rc = copy_from_user(&arg, uarg, sizeof(arg));
> + if (rc)
> + return rc;
> +
> + if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
> + return -EINVAL;
> +
> + if (arg.num_params) {
> + params = kcalloc(arg.num_params, sizeof(struct tee_param),
> + GFP_KERNEL);
> + if (!params)
> + return -ENOMEM;
> + uparams = (struct tee_ioctl_param __user *)(uarg + 1);
> + rc = params_from_user(ctx, params, arg.num_params, uparams);
> + if (rc)
> + goto out;
> + }
> +
> + rc = ctx->teedev->desc->ops->open_session(ctx, &arg, params);
> + if (rc)
> + goto out;
> + have_session = true;
> +
> + if (put_user(arg.session, &uarg->session) ||
> + put_user(arg.ret, &uarg->ret) ||
> + put_user(arg.ret_origin, &uarg->ret_origin)) {
> + rc = -EFAULT;
> + goto out;
> + }
> + rc = params_to_user(uparams, arg.num_params, params);
> +out:
> + /*
> + * If we've succeeded to open the session but failed to communicate
> + * it back to user space, close the session again to avoid leakage.
> + */
> + if (rc && have_session && ctx->teedev->desc->ops->close_session)
> + ctx->teedev->desc->ops->close_session(ctx, arg.session);
> +
> + if (params) {
> + /* Decrease ref count for all valid shared memory pointers */
> + for (n = 0; n < arg.num_params; n++)
> + if (param_is_memref(params + n) &&
> + params[n].u.memref.shm)
> + tee_shm_put(params[n].u.memref.shm);
> + kfree(params);
> + }
> +
> + return rc;
> +}
> +
> +static int tee_ioctl_invoke(struct tee_context *ctx,
> + struct tee_ioctl_buf_data __user *ubuf)
> +{
> + int rc;
> + size_t n;
> + struct tee_ioctl_buf_data buf;
> + struct tee_ioctl_invoke_arg __user *uarg;
> + struct tee_ioctl_invoke_arg arg;
> + struct tee_ioctl_param __user *uparams = NULL;
> + struct tee_param *params = NULL;
> +
> + if (!ctx->teedev->desc->ops->invoke_func)
> + return -EINVAL;
> +
> + rc = copy_from_user(&buf, ubuf, sizeof(buf));
> + if (rc)
> + return rc;
> +
> + if (buf.buf_len > TEE_MAX_ARG_SIZE ||
> + buf.buf_len < sizeof(struct tee_ioctl_invoke_arg))
> + return -EINVAL;
> +
> + uarg = (struct tee_ioctl_invoke_arg __user *)(unsigned long)buf.buf_ptr;
> + if (copy_from_user(&arg, uarg, sizeof(arg)))
> + return -EFAULT;
> +
> + if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
> + return -EINVAL;
> +
> + if (arg.num_params) {
> + params = kcalloc(arg.num_params, sizeof(struct tee_param),
> + GFP_KERNEL);
> + if (!params)
> + return -ENOMEM;
> + uparams = (struct tee_ioctl_param __user *)(uarg + 1);
> + rc = params_from_user(ctx, params, arg.num_params, uparams);
> + if (rc)
> + goto out;
> + }
> +
> + rc = ctx->teedev->desc->ops->invoke_func(ctx, &arg, params);
> + if (rc)
> + goto out;
> +
> + if (put_user(arg.ret, &uarg->ret) ||
> + put_user(arg.ret_origin, &uarg->ret_origin)) {
> + rc = -EFAULT;
> + goto out;
> + }
> + rc = params_to_user(uparams, arg.num_params, params);
> +out:
> + if (params) {
> + /* Decrease ref count for all valid shared memory pointers */
> + for (n = 0; n < arg.num_params; n++)
> + if (param_is_memref(params + n) &&
> + params[n].u.memref.shm)
> + tee_shm_put(params[n].u.memref.shm);
> + kfree(params);
> + }
> + return rc;
> +}
> +
> +static int tee_ioctl_cancel(struct tee_context *ctx,
> + struct tee_ioctl_cancel_arg __user *uarg)
> +{
> + struct tee_ioctl_cancel_arg arg;
> +
> + if (!ctx->teedev->desc->ops->cancel_req)
> + return -EINVAL;
> +
> + if (copy_from_user(&arg, uarg, sizeof(arg)))
> + return -EFAULT;
> +
> + return ctx->teedev->desc->ops->cancel_req(ctx, arg.cancel_id,
> + arg.session);
> +}
> +
> +static int tee_ioctl_close_session(struct tee_context *ctx,
> + struct tee_ioctl_close_session_arg __user *uarg)
> +{
> + struct tee_ioctl_close_session_arg arg;
> +
> + if (!ctx->teedev->desc->ops->close_session)
> + return -EINVAL;
> +
> + if (copy_from_user(&arg, uarg, sizeof(arg)))
> + return -EFAULT;
> +
> + return ctx->teedev->desc->ops->close_session(ctx, arg.session);
> +}
> +
> +static int params_to_supp(struct tee_context *ctx,
> + struct tee_ioctl_param __user *uparams,
> + size_t num_params, struct tee_param *params)
> +{
> + size_t n;
> +
> + for (n = 0; n < num_params; n++) {
> + struct tee_ioctl_param ip;
> + struct tee_param *p = params + n;
> +
> + ip.attr = p->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK;
> + switch (p->attr) {
> + case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
> + ip.u.value.a = p->u.value.a;
> + ip.u.value.b = p->u.value.b;
> + ip.u.value.c = p->u.value.c;
> + break;
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
> + case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
> + ip.u.memref.size = p->u.memref.size;
> + if (!p->u.memref.shm) {
> + ip.u.memref.shm_offs = 0;
> + ip.u.memref.shm_id = -1;
> + break;
> + }
> + ip.u.memref.shm_offs = p->u.memref.shm_offs;
> + ip.u.memref.shm_id = p->u.memref.shm->id;
> + break;
> + default:
> + memset(&ip.u, 0, sizeof(ip.u));
> + break;
> + }
> +
> + if (copy_to_user(uparams + n, &ip, sizeof(ip)))
> + return -EFAULT;
> + }
> +
> + return 0;
> +}
> +
> +static int tee_ioctl_supp_recv(struct tee_context *ctx,
> + struct tee_ioctl_buf_data __user *ubuf)
> +{
> + int rc;
> + struct tee_ioctl_buf_data buf;
> + struct tee_iocl_supp_recv_arg __user *uarg;
> + struct tee_param *params;
> + struct tee_ioctl_param __user *uparams;
> + u32 num_params;
> + u32 func;
> +
> + if (!ctx->teedev->desc->ops->supp_recv)
> + 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_recv_arg))
> + return -EINVAL;
> +
> + uarg = (struct tee_iocl_supp_recv_arg __user *)(unsigned long)
> + buf.buf_ptr;
> + if (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 = ctx->teedev->desc->ops->supp_recv(ctx, &func, &num_params, params);
> + if (rc)
> + goto out;
> +
> + if (put_user(func, &uarg->func) ||
> + put_user(num_params, &uarg->num_params)) {
> + rc = -EFAULT;
> + goto out;
> + }
> +
> + uparams = (struct tee_ioctl_param __user *)(uarg + 1);
> + rc = params_to_supp(ctx, uparams, num_params, params);
> +out:
> + kfree(params);
> + return rc;
> +}
> +
> +static int params_from_supp(struct tee_param *params, size_t num_params,
> + struct tee_ioctl_param __user *uparams)
> +{
> + size_t n;
> +
> + for (n = 0; n < num_params; n++) {
> + struct tee_param *p = params + n;
> + struct tee_ioctl_param ip;
> +
> + 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.u.value.a;
> + p->u.value.b = ip.u.value.b;
> + p->u.value.c = ip.u.value.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.u.memref.size;
> + 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;
> + struct tee_ioctl_param __user *uparams;
> + 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 = (struct tee_iocl_supp_send_arg __user *)(unsigned long)
> + 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;
> +
> + uparams = (struct tee_ioctl_param __user *)(uarg + 1);
> + rc = params_from_supp(params, num_params, uparams);
> + 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 = {
> + .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);
> + 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 || !dev || !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;
> + }
> +
> + 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);
> +
> + teedev->desc = teedesc;
> + teedev->pool = pool;
> +
> + return teedev;
> +err:
> + dev_err(dev, "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 the teedev already is registered, don't do it again. It's
> + * obviously an error to try to register twice, but if we return
> + * an error we'll force the driver to remove the teedev.
> + */
> + if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) {
> + dev_err(&teedev->dev, "attempt to register twice\n");
> + return 0;
> + }
> +
> + 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 < 0) {
> + pr_err("failed to allocate char dev region\n");
> + class_destroy(tee_class);
> + tee_class = NULL;
> + }
> +
> + return rc;
> +}
> +
> +subsys_initcall(tee_init);
> diff --git a/drivers/tee/tee_private.h b/drivers/tee/tee_private.h
> new file mode 100644
> index 0000000..549945a
> --- /dev/null
> +++ b/drivers/tee/tee_private.h
> @@ -0,0 +1,125 @@
> +/*
> + * Copyright (c) 2015-2016, Linaro Limited
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +#ifndef TEE_PRIVATE_H
> +#define TEE_PRIVATE_H
> +
> +#include <linux/cdev.h>
> +#include <linux/completion.h>
> +#include <linux/device.h>
> +#include <linux/kref.h>
> +#include <linux/mutex.h>
> +#include <linux/types.h>
> +
> +struct tee_device;
> +
> +/**
> + * struct tee_shm - shared memory object
> + * @teedev: device used to allocate the object
> + * @paddr: physical address of the shared memory
> + * @kaddr: virtual address of the shared memory
> + * @size: size of shared memory
> + * @dmabuf: dmabuf used to for exporting to user space
> + * @flags: defined by TEE_SHM_* in tee_drv.h
> + * @id: unique id of a shared memory object on this device
> + */
> +struct tee_shm {
> + struct tee_device *teedev;
> + phys_addr_t paddr;
> + void *kaddr;
> + size_t size;
> + struct dma_buf *dmabuf;
> + u32 flags;
> + int id;
> +};
> +
> +struct tee_shm_pool_mgr;
> +
> +/**
> + * struct tee_shm_pool_mgr_ops - shared memory pool manager operations
> + * @alloc: called when allocating shared memory
> + * @free: called when freeing shared memory
> + */
> +struct tee_shm_pool_mgr_ops {
> + int (*alloc)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm,
> + size_t size);
> + void (*free)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm);
> +};
> +
> +/**
> + * struct tee_shm_pool_mgr - shared memory manager
> + * @ops: operations
> + * @private_data: private data for the shared memory manager
> + */
> +struct tee_shm_pool_mgr {
> + const struct tee_shm_pool_mgr_ops *ops;
> + void *private_data;
> +};
> +
> +/**
> + * struct tee_shm_pool - shared memory pool
> + * @private_mgr: pool manager for shared memory only between kernel
> + * and secure world
> + * @dma_buf_mgr: pool manager for shared memory exported to user space
> + * @destroy: called when destroying the pool
> + * @private_data: private data for the pool
> + */
> +struct tee_shm_pool {
> + struct tee_shm_pool_mgr private_mgr;
> + struct tee_shm_pool_mgr dma_buf_mgr;
> + void (*destroy)(struct tee_shm_pool *pool);
> + void *private_data;
> +};
> +
> +#define TEE_DEVICE_FLAG_REGISTERED 0x1
> +#define TEE_MAX_DEV_NAME_LEN 32
> +
> +/**
> + * struct tee_device - TEE Device representation
> + * @name: name of device
> + * @desc: description of device
> + * @id: unique id of device
> + * @flags: represented by TEE_DEVICE_FLAG_REGISTERED above
> + * @dev: embedded basic device structure
> + * @cdev: embedded cdev
> + * @num_users: number of active users of this device
> + * @c_no_user: completion used when unregistering the device
> + * @mutex: mutex protecting @num_users and @idr
> + * @idr: register of shared memory object allocated on this device
> + * @pool: shared memory pool
> + */
> +struct tee_device {
> + char name[TEE_MAX_DEV_NAME_LEN];
> + const struct tee_desc *desc;
> + int id;
> + unsigned int flags;
> +
> + struct device dev;
> + struct cdev cdev;
> +
> + size_t num_users;
> + struct completion c_no_users;
> + struct mutex mutex; /* protects num_users and idr */
> +
> + struct idr idr;
> + struct tee_shm_pool *pool;
> +};
> +
> +int tee_shm_init(void);
> +
> +int tee_shm_get_fd(struct tee_shm *shm);
> +
> +bool tee_device_get(struct tee_device *teedev);
> +void tee_device_put(struct tee_device *teedev);
> +
> +#endif /*TEE_PRIVATE_H*/
> diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
> new file mode 100644
> index 0000000..db911d0
> --- /dev/null
> +++ b/drivers/tee/tee_shm.c
> @@ -0,0 +1,347 @@
> +/*
> + * Copyright (c) 2015-2016, Linaro Limited
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +#include <linux/device.h>
> +#include <linux/dma-buf.h>
> +#include <linux/fdtable.h>
> +#include <linux/idr.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/tee_drv.h>
> +#include "tee_private.h"
> +
> +static void tee_shm_release(struct tee_shm *shm)
> +{
> + struct tee_device *teedev = shm->teedev;
> + struct tee_shm_pool_mgr *poolm;
> +
> + mutex_lock(&teedev->mutex);
> + idr_remove(&teedev->idr, shm->id);
> + mutex_unlock(&teedev->mutex);
> +
> + if (shm->flags & TEE_SHM_DMA_BUF)
> + poolm = &teedev->pool->dma_buf_mgr;
> + else
> + poolm = &teedev->pool->private_mgr;
> +
> + poolm->ops->free(poolm, shm);
> + kfree(shm);
> +
> + tee_device_put(teedev);
> +}
> +
> +static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment
> + *attach, enum dma_data_direction dir)
> +{
> + return NULL;
> +}
> +
> +static void tee_shm_op_unmap_dma_buf(struct dma_buf_attachment *attach,
> + struct sg_table *table,
> + enum dma_data_direction dir)
> +{
> +}
> +
> +static void tee_shm_op_release(struct dma_buf *dmabuf)
> +{
> + struct tee_shm *shm = dmabuf->priv;
> +
> + tee_shm_release(shm);
> +}
> +
> +static void *tee_shm_op_kmap_atomic(struct dma_buf *dmabuf, unsigned long pgnum)
> +{
> + return NULL;
> +}
> +
> +static void *tee_shm_op_kmap(struct dma_buf *dmabuf, unsigned long pgnum)
> +{
> + return NULL;
> +}
> +
> +static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
> +{
> + struct tee_shm *shm = dmabuf->priv;
> + size_t size = vma->vm_end - vma->vm_start;
> +
> + return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT,
> + size, vma->vm_page_prot);
> +}
> +
> +static struct dma_buf_ops tee_shm_dma_buf_ops = {
> + .map_dma_buf = tee_shm_op_map_dma_buf,
> + .unmap_dma_buf = tee_shm_op_unmap_dma_buf,
> + .release = tee_shm_op_release,
> + .kmap_atomic = tee_shm_op_kmap_atomic,
> + .kmap = tee_shm_op_kmap,
> + .mmap = tee_shm_op_mmap,
> +};
> +
> +/**
> + * tee_shm_alloc() - Allocate shared memory
> + * @teedev: Driver that allocates the shared memory
> + * @size: Requested size of shared memory
> + * @flags: Flags setting properties for the requested shared memory.
> + *
> + * Memory allocated as global shared memory is automatically freed when the
> + * TEE file pointer is closed. The @flags field uses the bits defined by
> + * TEE_SHM_* above. TEE_SHM_MAPPED must currently always be set. If
> + * TEE_SHM_DMA_BUF global shared memory will be allocated and associated
> + * with a dma-buf handle, else driver private memory.
> + *
> + * @returns a pointer to 'struct tee_shm'
> + */
> +struct tee_shm *tee_shm_alloc(struct tee_device *teedev, size_t size, u32 flags)
> +{
> + struct tee_shm_pool_mgr *poolm = NULL;
> + struct tee_shm *shm;
> + void *ret;
> + int rc;
> +
> + if (!(flags & TEE_SHM_MAPPED)) {
> + dev_err(teedev->dev.parent,
> + "only mapped allocations supported\n");
> + return ERR_PTR(-EINVAL);
> + }
> +
> + if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF))) {
> + dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags);
> + return ERR_PTR(-EINVAL);
> + }
> +
> + if (!tee_device_get(teedev))
> + return ERR_PTR(-EINVAL);
> +
> + if (!teedev->pool) {
> + /* teedev has been detached from driver */
> + ret = ERR_PTR(-EINVAL);
> + goto err_dev_put;
> + }
> +
> + shm = kzalloc(sizeof(*shm), GFP_KERNEL);
> + if (!shm) {
> + ret = ERR_PTR(-ENOMEM);
> + goto err_dev_put;
> + }
> +
> + shm->flags = flags;
> + shm->teedev = teedev;
> + if (flags & TEE_SHM_DMA_BUF)
> + poolm = &teedev->pool->dma_buf_mgr;
> + else
> + poolm = &teedev->pool->private_mgr;
> +
> + rc = poolm->ops->alloc(poolm, shm, size);
> + if (rc) {
> + ret = ERR_PTR(rc);
> + goto err_kfree;
> + }
> +
> + mutex_lock(&teedev->mutex);
> + shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
> + mutex_unlock(&teedev->mutex);
> + if (shm->id < 0) {
> + ret = ERR_PTR(shm->id);
> + goto err_pool_free;
> + }
> +
> + if (flags & TEE_SHM_DMA_BUF) {
> + DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
> +
> + exp_info.ops = &tee_shm_dma_buf_ops;
> + exp_info.size = shm->size;
> + exp_info.flags = O_RDWR;
> + exp_info.priv = shm;
> +
> + shm->dmabuf = dma_buf_export(&exp_info);
> + if (IS_ERR(shm->dmabuf)) {
> + ret = ERR_CAST(shm->dmabuf);
> + goto err_rem;
> + }
> + }
> +
> + return shm;
> +err_rem:
> + mutex_lock(&teedev->mutex);
> + idr_remove(&teedev->idr, shm->id);
> + mutex_unlock(&teedev->mutex);
> +err_pool_free:
> + poolm->ops->free(poolm, shm);
> +err_kfree:
> + kfree(shm);
> +err_dev_put:
> + tee_device_put(teedev);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_alloc);
> +
> +/**
> + * tee_shm_get_fd() - Increase reference count and return file descriptor
> + * @shm: Shared memory handle
> + * @returns user space file descriptor to shared memory
> + */
> +int tee_shm_get_fd(struct tee_shm *shm)
> +{
> + u32 req_flags = TEE_SHM_MAPPED | TEE_SHM_DMA_BUF;
> + int fd;
> +
> + if ((shm->flags & req_flags) != req_flags)
> + return -EINVAL;
> +
> + fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC);
> + if (fd >= 0)
> + get_dma_buf(shm->dmabuf);
> + return fd;
> +}
> +
> +/**
> + * tee_shm_free() - Free shared memory
> + * @shm: Handle to shared memory to free
> + */
> +void tee_shm_free(struct tee_shm *shm)
> +{
> + /*
> + * dma_buf_put() decreases the dmabuf reference counter and will
> + * call tee_shm_release() when the last reference is gone.
> + *
> + * In the case of driver private memory we call tee_shm_release
> + * directly instead as it doesn't have a reference counter.
> + */
> + if (shm->flags & TEE_SHM_DMA_BUF)
> + dma_buf_put(shm->dmabuf);
> + else
> + tee_shm_release(shm);
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_free);
> +
> +/**
> + * tee_shm_va2pa() - Get physical address of a virtual address
> + * @shm: Shared memory handle
> + * @va: Virtual address to tranlsate
> + * @pa: Returned physical address
> + * @returns 0 on success and < 0 on failure
> + */
> +int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa)
> +{
> + /* Check that we're in the range of the shm */
> + if ((char *)va < (char *)shm->kaddr)
> + return -EINVAL;
> + if ((char *)va >= ((char *)shm->kaddr + shm->size))
> + return -EINVAL;
> +
> + return tee_shm_get_pa(
> + shm, (unsigned long)va - (unsigned long)shm->kaddr, pa);
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_va2pa);
> +
> +/**
> + * tee_shm_pa2va() - Get virtual address of a physical address
> + * @shm: Shared memory handle
> + * @pa: Physical address to tranlsate
> + * @va: Returned virtual address
> + * @returns 0 on success and < 0 on failure
> + */
> +int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va)
> +{
> + /* Check that we're in the range of the shm */
> + if (pa < shm->paddr)
> + return -EINVAL;
> + if (pa >= (shm->paddr + shm->size))
> + return -EINVAL;
> +
> + if (va) {
> + void *v = tee_shm_get_va(shm, pa - shm->paddr);
> +
> + if (IS_ERR(v))
> + return PTR_ERR(v);
> + *va = v;
> + }
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_pa2va);
> +
> +/**
> + * tee_shm_get_va() - Get virtual address of a shared memory plus an offset
> + * @shm: Shared memory handle
> + * @offs: Offset from start of this shared memory
> + * @returns virtual address of the shared memory + offs if offs is within
> + * the bounds of this shared memory, else an ERR_PTR
> + */
> +void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
> +{
> + if (offs >= shm->size)
> + return ERR_PTR(-EINVAL);
> + return (char *)shm->kaddr + offs;
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_get_va);
> +
> +/**
> + * tee_shm_get_pa() - Get physical address of a shared memory plus an offset
> + * @shm: Shared memory handle
> + * @offs: Offset from start of this shared memory
> + * @pa: Physical address to return
> + * @returns 0 if offs is within the bounds of this shared memory, else an
> + * error code.
> + */
> +int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa)
> +{
> + if (offs >= shm->size)
> + return -EINVAL;
> + if (pa)
> + *pa = shm->paddr + offs;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_get_pa);
> +
> +/**
> + * tee_shm_get_from_id() - Find shared memory object and increase referece count
> + * @teedev: Driver owning the shared mmemory
> + * @id: Id of shared memory object
> + * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
> + */
> +struct tee_shm *tee_shm_get_from_id(struct tee_device *teedev, int id)
> +{
> + struct tee_shm *shm;
> +
> + mutex_lock(&teedev->mutex);
> + shm = idr_find(&teedev->idr, id);
> + if (!shm)
> + shm = ERR_PTR(-EINVAL);
> + else if (shm->flags & TEE_SHM_DMA_BUF)
> + get_dma_buf(shm->dmabuf);
> + mutex_unlock(&teedev->mutex);
> + return shm;
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_get_from_id);
> +
> +/**
> + * tee_shm_get_id() - Get id of a shared memory object
> + * @shm: Shared memory handle
> + * @returns id
> + */
> +int tee_shm_get_id(struct tee_shm *shm)
> +{
> + return shm->id;
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_get_id);
> +
> +/**
> + * tee_shm_put() - Decrease reference count on a shared memory handle
> + * @shm: Shared memory handle
> + */
> +void tee_shm_put(struct tee_shm *shm)
> +{
> + if (shm->flags & TEE_SHM_DMA_BUF)
> + dma_buf_put(shm->dmabuf);
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_put);
> diff --git a/drivers/tee/tee_shm_pool.c b/drivers/tee/tee_shm_pool.c
> new file mode 100644
> index 0000000..ce5162b
> --- /dev/null
> +++ b/drivers/tee/tee_shm_pool.c
> @@ -0,0 +1,155 @@
> +/*
> + * Copyright (c) 2015, Linaro Limited
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +#include <linux/device.h>
> +#include <linux/dma-buf.h>
> +#include <linux/genalloc.h>
> +#include <linux/slab.h>
> +#include <linux/tee_drv.h>
> +#include "tee_private.h"
> +
> +static int pool_op_gen_alloc(struct tee_shm_pool_mgr *poolm,
> + struct tee_shm *shm, size_t size)
> +{
> + unsigned long va;
> + struct gen_pool *genpool = poolm->private_data;
> + size_t s = roundup(size, 1 << genpool->min_alloc_order);
> +
> + va = gen_pool_alloc(genpool, s);
> + if (!va)
> + return -ENOMEM;
> + shm->kaddr = (void *)va;
> + shm->paddr = gen_pool_virt_to_phys(genpool, va);
> + shm->size = s;
> + return 0;
> +}
> +
> +static void pool_op_gen_free(struct tee_shm_pool_mgr *poolm,
> + struct tee_shm *shm)
> +{
> + gen_pool_free(poolm->private_data, (unsigned long)shm->kaddr,
> + shm->size);
> + shm->kaddr = NULL;
> +}
> +
> +static const struct tee_shm_pool_mgr_ops pool_ops_generic = {
> + .alloc = pool_op_gen_alloc,
> + .free = pool_op_gen_free,
> +};
> +
> +static void pool_res_mem_destroy(struct tee_shm_pool *pool)
> +{
> + gen_pool_destroy(pool->private_mgr.private_data);
> + gen_pool_destroy(pool->dma_buf_mgr.private_data);
> +}
> +
> +static int pool_res_mem_mgr_init(struct tee_shm_pool_mgr *mgr,
> + struct tee_shm_pool_mem_info *info,
> + int min_alloc_order)
> +{
> + size_t page_mask = PAGE_SIZE - 1;
> + struct gen_pool *genpool = NULL;
> + int rc;
> +
> + /*
> + * Start and end must be page aligned
> + */
> + if ((info->vaddr & page_mask) || (info->paddr & page_mask) ||
> + (info->size & page_mask))
> + return -EINVAL;
> +
> + genpool = gen_pool_create(min_alloc_order, -1);
> + if (!genpool)
> + return -ENOMEM;
> +
> + gen_pool_set_algo(genpool, gen_pool_best_fit, NULL);
> + rc = gen_pool_add_virt(genpool, info->vaddr, info->paddr, info->size,
> + -1);
> + if (rc) {
> + gen_pool_destroy(genpool);
> + return rc;
> + }
> +
> + mgr->private_data = genpool;
> + mgr->ops = &pool_ops_generic;
> + return 0;
> +}
> +
> +/**
> + * tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved
> + * memory range
> + * @dev: Device allocating the pool
> + * @priv_info: Information for driver private shared memory pool
> + * @dmabuf_info: Information for dma-buf shared memory pool
> + *
> + * Start and end of pools will must be page aligned.
> + *
> + * Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
> + * in @dmabuf, others will use the range provided by @priv.
> + *
> + * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
> + */
> +struct tee_shm_pool *tee_shm_pool_alloc_res_mem(struct device *dev,
> + struct tee_shm_pool_mem_info *priv_info,
> + struct tee_shm_pool_mem_info *dmabuf_info)
> +{
> + struct tee_shm_pool *pool = NULL;
> + int ret;
> +
> + pool = kzalloc(sizeof(*pool), GFP_KERNEL);
> + if (!pool) {
> + ret = -ENOMEM;
> + goto err;
> + }
> +
> + /*
> + * Create the pool for driver private shared memory
> + */
> + ret = pool_res_mem_mgr_init(&pool->private_mgr, priv_info,
> + 3 /* 8 byte aligned */);
> + if (ret)
> + goto err;
> +
> + /*
> + * Create the pool for dma_buf shared memory
> + */
> + ret = pool_res_mem_mgr_init(&pool->dma_buf_mgr, dmabuf_info,
> + PAGE_SHIFT);
> + if (ret)
> + goto err;
> +
> + pool->destroy = pool_res_mem_destroy;
> + return pool;
> +err:
> + if (ret == -ENOMEM)
> + dev_err(dev, "can't allocate memory for res_mem shared memory pool\n");
> + if (pool && pool->private_mgr.private_data)
> + gen_pool_destroy(pool->private_mgr.private_data);
> + kfree(pool);
> + return ERR_PTR(ret);
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
> +
> +/**
> + * tee_shm_pool_free() - Free a shared memory pool
> + * @pool: The shared memory pool to free
> + *
> + * There must be no remaining shared memory allocated from this pool when
> + * this function is called.
> + */
> +void tee_shm_pool_free(struct tee_shm_pool *pool)
> +{
> + pool->destroy(pool);
> + kfree(pool);
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_pool_free);
> diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
> new file mode 100644
> index 0000000..b1d8227
> --- /dev/null
> +++ b/include/linux/tee_drv.h
> @@ -0,0 +1,273 @@
> +/*
> + * Copyright (c) 2015-2016, Linaro Limited
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#ifndef __TEE_DRV_H
> +#define __TEE_DRV_H
> +
> +#include <linux/types.h>
> +#include <linux/idr.h>
> +#include <linux/list.h>
> +#include <linux/tee.h>
> +
> +/*
> + * The file describes the API provided by the generic TEE driver to the
> + * specific TEE driver.
> + */
> +
> +#define TEE_SHM_MAPPED 0x1 /* Memory mapped by the kernel */
> +#define TEE_SHM_DMA_BUF 0x2 /* Memory with dma-buf handle */
> +
> +struct tee_device;
> +struct tee_shm;
> +struct tee_shm_pool;
> +
> +/**
> + * struct tee_context - driver specific context on file pointer data
> + * @teedev: pointer to this drivers struct tee_device
> + * @data: driver specific context data, managed by the driver
> + */
> +struct tee_context {
> + struct tee_device *teedev;
> + void *data;
> +};
> +
> +struct tee_param_memref {
> + size_t shm_offs;
> + size_t size;
> + struct tee_shm *shm;
> +};
> +
> +struct tee_param_value {
> + u64 a;
> + u64 b;
> + u64 c;
> +};
> +
> +struct tee_param {
> + u64 attr;
> + union {
> + struct tee_param_memref memref;
> + struct tee_param_value value;
> + } u;
> +};
> +
> +/**
> + * struct tee_driver_ops - driver operations vtable
> + * @get_version: returns version of driver
> + * @open: called when the device file is opened
> + * @release: release this open file
> + * @open_session: open a new session
> + * @close_session: close a session
> + * @invoke_func: invoke a trusted function
> + * @cancel_req: request cancel of an ongoing invoke or open
> + * @supp_revc: called for supplicant to get a command
> + * @supp_send: called for supplicant to send a response
> + */
> +struct tee_driver_ops {
> + void (*get_version)(struct tee_device *teedev,
> + struct tee_ioctl_version_data *vers);
> + int (*open)(struct tee_context *ctx);
> + void (*release)(struct tee_context *ctx);
> + int (*open_session)(struct tee_context *ctx,
> + struct tee_ioctl_open_session_arg *arg,
> + struct tee_param *param);
> + int (*close_session)(struct tee_context *ctx, u32 session);
> + int (*invoke_func)(struct tee_context *ctx,
> + struct tee_ioctl_invoke_arg *arg,
> + struct tee_param *param);
> + int (*cancel_req)(struct tee_context *ctx, u32 cancel_id, u32 session);
> + int (*supp_recv)(struct tee_context *ctx, u32 *func, u32 *num_params,
> + struct tee_param *param);
> + int (*supp_send)(struct tee_context *ctx, u32 ret, u32 num_params,
> + struct tee_param *param);
> +};
> +
> +/**
> + * struct tee_desc - Describes the TEE driver to the subsystem
> + * @name: name of driver
> + * @ops: driver operations vtable
> + * @owner: module providing the driver
> + * @flags: Extra properties of driver, defined by TEE_DESC_* below
> + */
> +#define TEE_DESC_PRIVILEGED 0x1
> +struct tee_desc {
> + const char *name;
> + const struct tee_driver_ops *ops;
> + struct module *owner;
> + u32 flags;
> +};
> +
> +/**
> + * 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);
> +
> +/**
> + * 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);
> +
> +/**
> + * 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);
> +
> +/**
> + * struct tee_shm_pool_mem_info - holds information needed to create a shared memory pool
> + * @vaddr: Virtual address of start of pool
> + * @paddr: Physical address of start of pool
> + * @size: Size in bytes of the pool
> + */
> +struct tee_shm_pool_mem_info {
> + unsigned long vaddr;
> + unsigned long paddr;
> + size_t size;
> +};
> +
> +/**
> + * tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved memory range
> + * @dev: Device allocating the pool
> + * @priv_info: Information for driver private shared memory pool
> + * @dmabuf_info: Information for dma-buf shared memory pool
> + *
> + * Start and end of pools will must be page aligned.
> + *
> + * Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
> + * in @dmabuf, others will use the range provided by @priv.
> + *
> + * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
> + */
> +struct tee_shm_pool *tee_shm_pool_alloc_res_mem(struct device *dev,
> + struct tee_shm_pool_mem_info *priv_info,
> + struct tee_shm_pool_mem_info *dmabuf_info);
> +
> +/**
> + * tee_shm_pool_free() - Free a shared memory pool
> + * @pool: The shared memory pool to free
> + *
> + * The must be no remaining shared memory allocated from this pool when
> + * this function is called.
> + */
> +void tee_shm_pool_free(struct tee_shm_pool *pool);
> +
> +/**
> + * tee_get_drvdata() - Return driver_data pointer
> + * @returns the driver_data pointer supplied to tee_register().
> + */
> +void *tee_get_drvdata(struct tee_device *teedev);
> +
> +/**
> + * tee_shm_alloc() - Allocate shared memory
> + * @teedev: Driver that allocates the shared memory
> + * @size: Requested size of shared memory
> + * @flags: Flags setting properties for the requested shared memory.
> + *
> + * Memory allocated as global shared memory is automatically freed when the
> + * TEE file pointer is closed. The @flags field uses the bits defined by
> + * TEE_SHM_* above. TEE_SHM_MAPPED must currently always be set. If
> + * TEE_SHM_DMA_BUF global shared memory will be allocated and associated
> + * with a dma-buf handle, else driver private memory.
> + *
> + * @returns a pointer to 'struct tee_shm'
> + */
> +struct tee_shm *tee_shm_alloc(struct tee_device *teedev, size_t size,
> + u32 flags);
> +
> +/**
> + * tee_shm_free() - Free shared memory
> + * @shm: Handle to shared memory to free
> + */
> +void tee_shm_free(struct tee_shm *shm);
> +
> +/**
> + * tee_shm_put() - Decrease reference count on a shared memory handle
> + * @shm: Shared memory handle
> + */
> +void tee_shm_put(struct tee_shm *shm);
> +
> +/**
> + * tee_shm_va2pa() - Get physical address of a virtual address
> + * @shm: Shared memory handle
> + * @va: Virtual address to tranlsate
> + * @pa: Returned physical address
> + * @returns 0 on success and < 0 on failure
> + */
> +int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa);
> +
> +/**
> + * tee_shm_pa2va() - Get virtual address of a physical address
> + * @shm: Shared memory handle
> + * @pa: Physical address to tranlsate
> + * @va: Returned virtual address
> + * @returns 0 on success and < 0 on failure
> + */
> +int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va);
> +
> +/**
> + * tee_shm_get_va() - Get virtual address of a shared memory plus an offset
> + * @shm: Shared memory handle
> + * @offs: Offset from start of this shared memory
> + * @returns virtual address of the shared memory + offs if offs is within
> + * the bounds of this shared memory, else an ERR_PTR
> + */
> +void *tee_shm_get_va(struct tee_shm *shm, size_t offs);
> +
> +/**
> + * tee_shm_get_pa() - Get physical address of a shared memory plus an offset
> + * @shm: Shared memory handle
> + * @offs: Offset from start of this shared memory
> + * @pa: Physical address to return
> + * @returns 0 if offs is within the bounds of this shared memory, else an
> + * error code.
> + */
> +int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa);
> +
> +/**
> + * tee_shm_get_id() - Get id of a shared memory object
> + * @shm: Shared memory handle
> + * @returns id
> + */
> +int tee_shm_get_id(struct tee_shm *shm);
> +
> +/**
> + * tee_shm_get_from_id() - Find shared memory object and increase referece count
> + * @teedev: Driver owning the shared mmemory
> + * @id: Id of shared memory object
> + * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
> + */
> +struct tee_shm *tee_shm_get_from_id(struct tee_device *teedev, int id);
> +
> +#endif /*__TEE_DRV_H*/
> diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h
> new file mode 100644
> index 0000000..b2bcb23
> --- /dev/null
> +++ b/include/uapi/linux/tee.h
> @@ -0,0 +1,400 @@
> +/*
> + * Copyright (c) 2015-2016, Linaro Limited
> + * All rights reserved.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions are met:
> + *
> + * 1. Redistributions of source code must retain the above copyright notice,
> + * this list of conditions and the following disclaimer.
> + *
> + * 2. Redistributions in binary form must reproduce the above copyright notice,
> + * this list of conditions and the following disclaimer in the documentation
> + * and/or other materials provided with the distribution.
> + *
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
> + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
> + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
> + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
> + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
> + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
> + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
> + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
> + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
> + * POSSIBILITY OF SUCH DAMAGE.
> + */
> +
> +#ifndef __TEE_H
> +#define __TEE_H
> +
> +#include <linux/ioctl.h>
> +#include <linux/types.h>
> +
> +/*
> + * This file describes the API provided by a TEE driver to user space.
> + *
> + * Each TEE driver defines a TEE specific protocol which is used for the
> + * data passed back and forth using TEE_IOC_CMD.
> + */
> +
> +/* Helpers to make the ioctl defines */
> +#define TEE_IOC_MAGIC 0xa4
> +#define TEE_IOC_BASE 0
> +
> +/* Flags relating to shared memory */
> +#define TEE_IOCTL_SHM_MAPPED 0x1 /* memory mapped in normal world */
> +#define TEE_IOCTL_SHM_DMA_BUF 0x2 /* dma-buf handle on shared memory */
> +
> +#define TEE_MAX_ARG_SIZE 1024
> +
> +#define TEE_GEN_CAP_GP (1 << 0)/* GlobalPlatform compliant TEE */
> +
> +/*
> + * TEE Implementation ID
> + */
> +#define TEE_IMPL_ID_OPTEE 1
> +
> +/*
> + * OP-TEE specific capabilities
> + */
> +#define TEE_OPTEE_CAP_TZ (1 << 0)
> +
> +/**
> + * struct tee_ioctl_version_data - TEE version
> + * @impl_id: [out] TEE implementation id
> + * @impl_caps: [out] Implementation specific capabilities
> + * @gen_caps: [out] Generic capabilities, defined by TEE_GEN_CAPS_* above
> + *
> + * Identifies the TEE implementation, @impl_id is one of TEE_IMPL_ID_* above.
> + * @impl_caps is implementation specific, for example TEE_OPTEE_CAP_*
> + * is valid when @impl_id == TEE_IMPL_ID_OPTEE.
> + */
> +struct tee_ioctl_version_data {
> + __u32 impl_id;
> + __u32 impl_caps;
> + __u32 gen_caps;
> +};
> +
> +/**
> + * TEE_IOC_VERSION - query version of TEE
> + *
> + * Takes a tee_ioctl_version_data struct and returns with the TEE version
> + * data filled in.
> + */
> +#define TEE_IOC_VERSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 0, \
> + struct tee_ioctl_version_data)
> +
> +/**
> + * struct tee_ioctl_shm_alloc_data - Shared memory allocate argument
> + * @size: [in/out] Size of shared memory to allocate
> + * @flags: [in/out] Flags to/from allocation.
> + * @id: [out] Identifier of the shared memory
> + *
> + * The flags field should currently be zero as input. Updated by the call
> + * with actual flags as defined by TEE_IOCTL_SHM_* above.
> + * This structure is used as argument for TEE_IOC_SHM_ALLOC below.
> + */
> +struct tee_ioctl_shm_alloc_data {
> + __u64 size;
> + __u32 flags;
> + __s32 id;
> +};
> +
> +/**
> + * TEE_IOC_SHM_ALLOC - allocate shared memory
> + *
> + * Allocates shared memory between the user space process and secure OS.
> + *
> + * Returns a file descriptor on success or < 0 on failure
> + *
> + * The returned file descriptor is used to map the shared memory into user
> + * space. The shared memory is freed when the descriptor is closed and the
> + * memory is unmapped.
> + */
> +#define TEE_IOC_SHM_ALLOC _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + 1, \
> + struct tee_ioctl_shm_alloc_data)
> +
> +/**
> + * struct tee_ioctl_buf_data - Variable sized buffer
> + * @buf_ptr: [in] A __user pointer to a buffer
> + * @buf_len: [in] Length of the buffer above
> + *
> + * Used as argument for TEE_IOC_OPEN_SESSION, TEE_IOC_INVOKE,
> + * TEE_IOC_SUPPL_RECV, and TEE_IOC_SUPPL_SEND below.
> + */
> +struct tee_ioctl_buf_data {
> + __u64 buf_ptr;
> + __u64 buf_len;
> +};
> +
> +/*
> + * Attributes for struct tee_ioctl_param, selects field in the union
> + */
> +#define TEE_IOCTL_PARAM_ATTR_TYPE_NONE 0 /* parameter not used */
> +
> +/*
> + * These defines value parameters (struct tee_ioctl_param_value)
> + */
> +#define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT 1
> +#define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT 2
> +#define TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT 3 /* input and output */
> +
> +/*
> + * These defines shared memory reference parameters (struct
> + * tee_ioctl_param_memref)
> + */
> +#define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT 5
> +#define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT 6
> +#define TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT 7 /* input and output */
> +
> +/*
> + * Mask for the type part of the attribute, leaves room for more types
> + */
> +#define TEE_IOCTL_PARAM_ATTR_TYPE_MASK 0xff
> +
> +/*
> + * Matches TEEC_LOGIN_* in GP TEE Client API
> + * Is only defined for GP compliant TEEs
> + */
> +#define TEE_IOCTL_LOGIN_PUBLIC 0
> +#define TEE_IOCTL_LOGIN_USER 1
> +#define TEE_IOCTL_LOGIN_GROUP 2
> +#define TEE_IOCTL_LOGIN_APPLICATION 4
> +#define TEE_IOCTL_LOGIN_USER_APPLICATION 5
> +#define TEE_IOCTL_LOGIN_GROUP_APPLICATION 6
> +
> +/**
> + * struct tee_ioctl_param_memref - memory reference
> + * @shm_offs: Offset into the shared memory object
> + * @size: Size of the buffer
> + * @shm_id: Shared memory identifier
> + *
> + * Shared memory is allocated with TEE_IOC_SHM_ALLOC which returns an
> + * identifier representing the shared memory object. A memref can reference
> + * a part of a shared memory by specifying an offset (@shm_offs) and @size
> + * of the object. To supply the entire shared memory object set @shm_offs
> + * to 0 and @size to the previously returned size of the object.
> + */
> +struct tee_ioctl_param_memref {
> + __u64 shm_offs;
> + __u64 size;
> + __s64 shm_id;
> +};
> +
> +/**
> + * struct tee_ioctl_param_value - values
> + * @a: first value
> + * @b: second value
> + * @c: third value
> + */
> +struct tee_ioctl_param_value {
> + __u64 a;
> + __u64 b;
> + __u64 c;
> +};
> +
> +/**
> + * struct tee_ioctl_param - parameter
> + * @attr: attributes
> + * @memref: a memory reference
> + * @value: a value
> + *
> + * @attr & TEE_PARAM_ATTR_TYPE_MASK indicates if memref or value is used in
> + * the union. TEE_PARAM_ATTR_TYPE_VALUE_* indicates value and
> + * TEE_PARAM_ATTR_TYPE_MEMREF_* indicates memref. TEE_PARAM_ATTR_TYPE_NONE
> + * indicates that none of the members are used.
> + */
> +struct tee_ioctl_param {
> + __u64 attr;
> + union {
> + struct tee_ioctl_param_memref memref;
> + struct tee_ioctl_param_value value;
> + } u;
> +};
> +
> +#define TEE_IOCTL_UUID_LEN 16
> +
> +/**
> + * struct tee_ioctl_open_session_arg - Open session argument
> + * @uuid: [in] UUID of the Trusted Application
> + * @clnt_uuid: [in] UUID of client
> + * @clnt_login: [in] Login class of client, TEE_LOGIN_* above
> + * @cancel_id: [in] Cancellation id, a unique value to identify this request
> + * @session: [out] Session id
> + * @ret: [out] return value
> + * @ret_origin [out] origin of the return value
> + * @num_params [in] number of parameters following this struct
> + */
> +struct tee_ioctl_open_session_arg {
> + __u8 uuid[TEE_IOCTL_UUID_LEN];
> + __u8 clnt_uuid[TEE_IOCTL_UUID_LEN];
> + __u32 clnt_login;
> + __u32 cancel_id;
> + __u32 session;
> + __u32 ret;
> + __u32 ret_origin;
> + __u32 num_params;
> + /*
> + * this struct is 8 byte aligned since the 'struct tee_ioctl_param'
> + * which follows requires 8 byte alignment.
> + *
> + * Commented out element used to visualize the layout dynamic part
> + * of the struct. This field is not available at all if
> + * num_params == 0.
> + *
> + * struct tee_ioctl_param params[num_params];
> + */
> +} __aligned(8);
> +
> +/**
> + * TEE_IOC_OPEN_SESSION - opens a session to a Trusted Application
> + *
> + * Takes a struct tee_ioctl_buf_data which contains a struct
> + * tee_ioctl_open_session_arg followed by any array of struct
> + * tee_ioctl_param
> + */
> +#define TEE_IOC_OPEN_SESSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 2, \
> + struct tee_ioctl_buf_data)
> +
> +/**
> + * struct tee_ioctl_invoke_func_arg - Invokes a function in a Trusted Application
> + * @func: [in] Trusted Application function, specific to the TA
> + * @session: [in] Session id
> + * @cancel_id: [in] Cancellation id, a unique value to identify this request
> + * @ret: [out] return value
> + * @ret_origin [out] origin of the return value
> + * @num_params [in] number of parameters following this struct
> + */
> +struct tee_ioctl_invoke_arg {
> + __u32 func;
> + __u32 session;
> + __u32 cancel_id;
> + __u32 ret;
> + __u32 ret_origin;
> + __u32 num_params;
> + /*
> + * this struct is 8 byte aligned since the 'struct tee_ioctl_param'
> + * which follows requires 8 byte alignment.
> + *
> + * Commented out element used to visualize the layout dynamic part
> + * of the struct. This field is not available at all if
> + * num_params == 0.
> + *
> + * struct tee_ioctl_param params[num_params];
> + */
> +} __aligned(8);
> +
> +/**
> + * TEE_IOC_INVOKE - Invokes a function in a Trusted Application
> + *
> + * Takes a struct tee_ioctl_buf_data which contains a struct
> + * tee_invoke_func_arg followed by any array of struct tee_param
> + */
> +#define TEE_IOC_INVOKE _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 3, \
> + struct tee_ioctl_buf_data)
> +
> +/**
> + * struct tee_ioctl_cancel_arg - Cancels an open session or invoke ioctl
> + * @cancel_id: [in] Cancellation id, a unique value to identify this request
> + * @session: [in] Session id, if the session is opened, else set to 0
> + */
> +struct tee_ioctl_cancel_arg {
> + __u32 cancel_id;
> + __u32 session;
> +};
> +
> +/**
> + * TEE_IOC_CANCEL - Cancels an open session or invoke
> + */
> +#define TEE_IOC_CANCEL _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 4, \
> + struct tee_ioctl_cancel_arg)
> +
> +/**
> + * struct tee_ioctl_close_session_arg - Closes an open session
> + * @session: [in] Session id
> + */
> +struct tee_ioctl_close_session_arg {
> + __u32 session;
> +};
> +
> +/**
> + * TEE_IOC_CLOSE_SESSION - Closes a session
> + */
> +#define TEE_IOC_CLOSE_SESSION _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 5, \
> + struct tee_ioctl_close_session_arg)
> +
> +/**
> + * struct tee_iocl_supp_recv_arg - Receive a request for a supplicant function
> + * @func: [in] supplicant function
> + * @num_params [in/out] number of parameters following this struct
> + *
> + * @num_params is the number of params that tee-supplicant has room to
> + * receive when input, @num_params is the number of actual params
> + * tee-supplicant receives when output.
> + */
> +struct tee_iocl_supp_recv_arg {
> + __u32 func;
> + __u32 num_params;
> + /*
> + * this struct is 8 byte aligned since the 'struct tee_ioctl_param'
> + * which follows requires 8 byte alignment.
> + *
> + * Commented out element used to visualize the layout dynamic part
> + * of the struct. This field is not available at all if
> + * num_params == 0.
> + *
> + * struct tee_ioctl_param params[num_params];
> + */
> +} __aligned(8);
> +
> +/**
> + * TEE_IOC_SUPPL_RECV - Receive a request for a supplicant function
> + *
> + * Takes a struct tee_ioctl_buf_data which contains a struct
> + * tee_iocl_supp_recv_arg followed by any array of struct tee_param
> + */
> +#define TEE_IOC_SUPPL_RECV _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 6, \
> + struct tee_ioctl_buf_data)
> +
> +/**
> + * struct tee_iocl_supp_send_arg - Send a response to a received request
> + * @ret: [out] return value
> + * @num_params [in] number of parameters following this struct
> + */
> +struct tee_iocl_supp_send_arg {
> + __u32 ret;
> + __u32 num_params;
> + /*
> + * this struct is 8 byte aligned since the 'struct tee_ioctl_param'
> + * which follows requires 8 byte alignment.
> + *
> + * Commented out element used to visualize the layout dynamic part
> + * of the struct. This field is not available at all if
> + * num_params == 0.
> + *
> + * struct tee_ioctl_param params[num_params];
> + */
> +} __aligned(8);
> +/**
> + * TEE_IOC_SUPPL_SEND - Receive a request for a supplicant function
> + *
> + * Takes a struct tee_ioctl_buf_data which contains a struct
> + * tee_iocl_supp_send_arg followed by any array of struct tee_param
> + */
> +#define TEE_IOC_SUPPL_SEND _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + 7, \
> + struct tee_ioctl_buf_data)
> +
> +/*
> + * Five syscalls are used when communicating with the TEE driver.
> + * open(): opens the device associated with the driver
> + * ioctl(): as described above operating on the file descriptor from open()
> + * close(): two cases
> + * - closes the device file descriptor
> + * - closes a file descriptor connected to allocated shared memory
> + * mmap(): maps shared memory into user space using information from struct
> + * tee_ioctl_shm_alloc_data
> + * munmap(): unmaps previously shared memory
> + */
> +
> +#endif /*__TEE_H*/
> --
> 1.9.1

Reviewed-by: Javier González <javier@javigon.com>

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