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Subject[RFC PATCH 1/2] tee: generic TEE subsystem
Date
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.

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.

To avoid putting unnecessary restrictions on the TEE driver and the
trusted OS the TEE_IOC_CMD passes an opaque buffer to the TEE driver to
facilitate a communication channel between user space and the trusted
OS.

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>

Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
---
Documentation/ioctl/ioctl-number.txt | 1 +
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/tee/Kconfig | 8 +
drivers/tee/Makefile | 3 +
drivers/tee/tee.c | 253 +++++++++++++++++++++++++++
drivers/tee/tee_private.h | 64 +++++++
drivers/tee/tee_shm.c | 330 +++++++++++++++++++++++++++++++++++
drivers/tee/tee_shm_pool.c | 246 ++++++++++++++++++++++++++
include/linux/tee/tee.h | 180 +++++++++++++++++++
include/linux/tee/tee_drv.h | 271 ++++++++++++++++++++++++++++
11 files changed, 1359 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/tee.h
create mode 100644 include/linux/tee/tee_drv.h

diff --git a/Documentation/ioctl/ioctl-number.txt b/Documentation/ioctl/ioctl-number.txt
index 8136e1f..6e9bd04 100644
--- a/Documentation/ioctl/ioctl-number.txt
+++ b/Documentation/ioctl/ioctl-number.txt
@@ -301,6 +301,7 @@ 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 linux/sec-hw/tee.h Generic TEE subsystem
0xAB 00-1F linux/nbd.h
0xAC 00-1F linux/raw.h
0xAD 00 Netfilter device in development:
diff --git a/drivers/Kconfig b/drivers/Kconfig
index c0cc96b..7510f69 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -182,4 +182,6 @@ source "drivers/thunderbolt/Kconfig"

source "drivers/android/Kconfig"

+source "drivers/tee/Kconfig"
+
endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index 527a6da..0d24e70 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -165,3 +165,4 @@ obj-$(CONFIG_RAS) += ras/
obj-$(CONFIG_THUNDERBOLT) += thunderbolt/
obj-$(CONFIG_CORESIGHT) += coresight/
obj-$(CONFIG_ANDROID) += android/
+obj-$(CONFIG_TEE) += tee/
diff --git a/drivers/tee/Kconfig b/drivers/tee/Kconfig
new file mode 100644
index 0000000..64a8cd7
--- /dev/null
+++ b/drivers/tee/Kconfig
@@ -0,0 +1,8 @@
+# Generic Trusted Execution Environment Configuration
+config TEE
+ bool "Trusted Execution Environment support"
+ default n
+ select DMA_SHARED_BUFFER
+ 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..23a6e75
--- /dev/null
+++ b/drivers/tee/tee.c
@@ -0,0 +1,253 @@
+/*
+ * 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/fs.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/tee/tee_drv.h>
+#include "tee_private.h"
+
+static int tee_open(struct inode *inode, struct file *filp)
+{
+ int ret;
+ struct tee_device *teedev;
+ struct tee_context *ctx;
+
+ teedev = container_of(filp->private_data, struct tee_device, miscdev);
+ if (!try_module_get(teedev->desc->owner))
+ return -EINVAL;
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->teedev = teedev;
+ filp->private_data = ctx;
+ ret = teedev->desc->ops->open(ctx);
+ if (ret) {
+ kfree(ctx);
+ module_put(teedev->desc->owner);
+ }
+ return ret;
+}
+
+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);
+ module_put(teedev->desc->owner);
+ return 0;
+}
+
+static long tee_ioctl_version(struct tee_context *ctx,
+ struct tee_ioctl_version __user *uvers)
+{
+ struct tee_ioctl_version vers;
+
+ memset(&vers, 0, sizeof(vers));
+ vers.gen_version = TEE_SUBSYS_VERSION;
+ ctx->teedev->desc->ops->get_version(ctx, &vers.spec_version,
+ vers.uuid);
+
+ return copy_to_user(uvers, &vers, sizeof(vers));
+}
+
+static long tee_ioctl_cmd(struct tee_context *ctx,
+ struct tee_ioctl_cmd_data __user *ucmd)
+{
+ long ret;
+ struct tee_ioctl_cmd_data cmd;
+ void __user *buf_ptr;
+
+ ret = copy_from_user(&cmd, ucmd, sizeof(cmd));
+ if (ret)
+ return ret;
+
+ buf_ptr = (void __user *)(uintptr_t)cmd.buf_ptr;
+ return ctx->teedev->desc->ops->cmd(ctx, buf_ptr, cmd.buf_len);
+}
+
+static long 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.fd = -1;
+
+ shm = tee_shm_alloc(ctx->teedev, data.size,
+ TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
+ if (IS_ERR(shm))
+ return PTR_ERR(shm);
+
+ ret = ctx->teedev->desc->ops->shm_share(shm);
+ if (ret)
+ goto err;
+
+ data.flags = shm->flags;
+ data.size = shm->size;
+ data.fd = tee_shm_get_fd(shm);
+ if (data.fd < 0) {
+ ret = data.fd;
+ goto err;
+ }
+
+ if (copy_to_user(udata, &data, sizeof(data))) {
+ ret = -EFAULT;
+ goto err;
+ }
+ /*
+ * When user space closes the file descriptor the shared memory
+ * should be freed
+ */
+ tee_shm_put(shm);
+ return 0;
+err:
+ if (data.fd >= 0)
+ tee_shm_put_fd(data.fd);
+ tee_shm_free(shm);
+ return ret;
+}
+
+static long tee_ioctl_mem_share(struct tee_context *ctx,
+ struct tee_ioctl_mem_share_data __user *udata)
+{
+ /* Not supported yet */
+ return -ENOSYS;
+}
+
+static long tee_ioctl_mem_unshare(struct tee_context *ctx,
+ struct tee_ioctl_mem_share_data __user *udata)
+{
+ /* Not supported yet */
+ return -ENOSYS;
+}
+
+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_CMD:
+ return tee_ioctl_cmd(ctx, uarg);
+ case TEE_IOC_SHM_ALLOC:
+ return tee_ioctl_shm_alloc(ctx, uarg);
+ case TEE_IOC_MEM_SHARE:
+ return tee_ioctl_mem_share(ctx, uarg);
+ case TEE_IOC_MEM_UNSHARE:
+ return tee_ioctl_mem_unshare(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
+};
+
+struct tee_device *tee_register(const struct tee_desc *teedesc,
+ struct device *dev, struct tee_shm_pool *pool,
+ void *driver_data)
+{
+ static atomic_t device_no = ATOMIC_INIT(-1);
+ static atomic_t priv_device_no = ATOMIC_INIT(-1);
+ struct tee_device *teedev;
+ void *ret;
+ int rc;
+
+ if (!teedesc || !teedesc->name || !dev || !pool) {
+ ret = ERR_PTR(-EINVAL);
+ goto err;
+ }
+
+ teedev = devm_kzalloc(dev, sizeof(*teedev), GFP_KERNEL);
+ if (!teedev) {
+ ret = ERR_PTR(-ENOMEM);
+ goto err;
+ }
+
+ teedev->dev = dev;
+ teedev->desc = teedesc;
+ teedev->pool = pool;
+ teedev->driver_data = driver_data;
+
+ if (teedesc->flags & TEE_DESC_PRIVILEGED)
+ snprintf(teedev->name, sizeof(teedev->name),
+ "teepriv%d", atomic_inc_return(&priv_device_no));
+ else
+ snprintf(teedev->name, sizeof(teedev->name),
+ "tee%d", atomic_inc_return(&device_no));
+
+ teedev->miscdev.parent = dev;
+ teedev->miscdev.minor = MISC_DYNAMIC_MINOR;
+ teedev->miscdev.name = teedev->name;
+ teedev->miscdev.fops = &tee_fops;
+
+ rc = misc_register(&teedev->miscdev);
+ if (rc) {
+ dev_err(dev, "misc_register() failed name=\"%s\"\n",
+ teedev->name);
+ ret = ERR_PTR(rc);
+ goto err;
+ }
+
+ INIT_LIST_HEAD(&teedev->list_shm);
+
+ dev_set_drvdata(teedev->miscdev.this_device, teedev);
+
+ dev_dbg(dev, "register misc device \"%s\" (minor=%d)\n",
+ dev_name(teedev->miscdev.this_device), teedev->miscdev.minor);
+
+ return teedev;
+err:
+ dev_err(dev, "could not register %s driver\n",
+ teedesc->flags & TEE_DESC_PRIVILEGED ? "privileged" : "client");
+ return ret;
+}
+EXPORT_SYMBOL_GPL(tee_register);
+
+void tee_unregister(struct tee_device *teedev)
+{
+ if (!teedev)
+ return;
+
+ dev_dbg(teedev->dev, "unregister misc device \"%s\" (minor=%d)\n",
+ dev_name(teedev->miscdev.this_device), teedev->miscdev.minor);
+ misc_deregister(&teedev->miscdev);
+}
+EXPORT_SYMBOL_GPL(tee_unregister);
+
+void *tee_get_drvdata(struct tee_device *teedev)
+{
+ return teedev->driver_data;
+}
+EXPORT_SYMBOL_GPL(tee_get_drvdata);
diff --git a/drivers/tee/tee_private.h b/drivers/tee/tee_private.h
new file mode 100644
index 0000000..2199634
--- /dev/null
+++ b/drivers/tee/tee_private.h
@@ -0,0 +1,64 @@
+/*
+ * 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.
+ *
+ */
+#ifndef TEE_PRIVATE_H
+#define TEE_PRIVATE_H
+
+struct tee_device;
+
+struct tee_shm {
+ struct list_head list_node;
+ struct tee_device *teedev;
+ phys_addr_t paddr;
+ void *kaddr;
+ size_t size;
+ struct dma_buf *dmabuf;
+ struct page *pages;
+ u32 flags;
+};
+
+struct tee_shm_pool_mgr;
+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 {
+ const struct tee_shm_pool_mgr_ops *ops;
+ void *private_data;
+};
+
+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_MAX_DEV_NAME_LEN 32
+struct tee_device {
+ char name[TEE_MAX_DEV_NAME_LEN];
+ const struct tee_desc *desc;
+ struct device *dev;
+ struct miscdevice miscdev;
+
+ void *driver_data;
+
+ struct list_head list_shm;
+ struct tee_shm_pool *pool;
+};
+
+int tee_shm_init(void);
+
+#endif /*TEE_PRIVATE_H*/
diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
new file mode 100644
index 0000000..38359ad
--- /dev/null
+++ b/drivers/tee/tee_shm.c
@@ -0,0 +1,330 @@
+/*
+ * 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/fdtable.h>
+#include <linux/sched.h>
+#include <linux/dma-buf.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/tee/tee_drv.h>
+#include "tee_private.h"
+
+/* Mutex for all shm objects and lists */
+static DEFINE_MUTEX(teeshm_mutex);
+
+static void tee_shm_release(struct tee_shm *shm);
+
+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,
+};
+
+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, "only mapped allocations supported\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if ((flags & ~(TEE_SHM_MAPPED|TEE_SHM_DMA_BUF))) {
+ dev_err(teedev->dev, "invalid shm flags 0x%x", flags);
+ return ERR_PTR(-EINVAL);
+ }
+
+ shm = kzalloc(sizeof(struct tee_shm), GFP_KERNEL);
+ if (!shm)
+ return ERR_PTR(-ENOMEM);
+
+ if (!try_module_get(teedev->desc->owner)) {
+ ret = ERR_PTR(-EINVAL);
+ goto err;
+ }
+
+ 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;
+ }
+
+ mutex_lock(&teeshm_mutex);
+ list_add_tail(&shm->list_node, &teedev->list_shm);
+ mutex_unlock(&teeshm_mutex);
+
+ if (flags & TEE_SHM_DMA_BUF) {
+ shm->dmabuf = dma_buf_export(shm, &tee_shm_dma_buf_ops,
+ shm->size, O_RDWR, NULL);
+ if (IS_ERR(shm->dmabuf)) {
+ ret = ERR_CAST(shm->dmabuf);
+ goto err;
+ }
+
+ /*
+ * Only call share on dma_buf shm:s, as the driver private
+ * shm:s always originates from the driver itself.
+ */
+ rc = teedev->desc->ops->shm_share(shm);
+ if (rc) {
+ dma_buf_put(shm->dmabuf);
+ return ERR_PTR(rc);
+ }
+ shm->flags |= __TEE_SHM_SHARED;
+ }
+
+ return shm;
+err:
+ if (poolm && shm->kaddr)
+ poolm->ops->free(poolm, shm);
+ kfree(shm);
+ module_put(teedev->desc->owner);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(tee_shm_alloc);
+
+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;
+}
+EXPORT_SYMBOL_GPL(tee_shm_get_fd);
+
+int tee_shm_put_fd(int fd)
+{
+ return __close_fd(current->files, fd);
+}
+EXPORT_SYMBOL_GPL(tee_shm_put_fd);
+
+
+static void tee_shm_release(struct tee_shm *shm)
+{
+ struct tee_device *teedev = shm->teedev;
+ struct tee_shm_pool_mgr *poolm;
+
+ mutex_lock(&teeshm_mutex);
+ list_del(&shm->list_node);
+ mutex_unlock(&teeshm_mutex);
+
+ if (shm->flags & TEE_SHM_DMA_BUF)
+ poolm = &teedev->pool->dma_buf_mgr;
+ else
+ poolm = &teedev->pool->private_mgr;
+
+ if (shm->flags & __TEE_SHM_SHARED)
+ teedev->desc->ops->shm_unshare(shm);
+ poolm->ops->free(poolm, shm);
+ kfree(shm);
+
+ module_put(teedev->desc->owner);
+}
+
+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 anonymous memory we call tee_shm_release directly
+ * instead at 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);
+
+static bool cmp_key_va(struct tee_shm *shm, uintptr_t va)
+{
+ uintptr_t shm_va = (uintptr_t)shm->kaddr;
+
+ return (va >= shm_va) && (va < (shm_va + shm->size));
+}
+
+static bool cmp_key_pa(struct tee_shm *shm, uintptr_t pa)
+{
+ return (pa >= shm->paddr) && (pa < (shm->paddr + shm->size));
+}
+
+static struct tee_shm *tee_shm_find_by_key(struct tee_device *teedev, u32 flags,
+ bool (*cmp)(struct tee_shm *shm, uintptr_t key),
+ uintptr_t key)
+{
+ struct tee_shm *ret = NULL;
+ struct tee_shm *shm;
+
+ mutex_lock(&teeshm_mutex);
+ list_for_each_entry(shm, &teedev->list_shm, list_node) {
+ if (cmp(shm, key)) {
+ ret = shm;
+ break;
+ }
+ }
+ mutex_unlock(&teeshm_mutex);
+
+ return ret;
+}
+
+struct tee_shm *tee_shm_find_by_va(struct tee_device *teedev, u32 flags,
+ void *va)
+{
+ return tee_shm_find_by_key(teedev, flags, cmp_key_va, (uintptr_t)va);
+}
+EXPORT_SYMBOL_GPL(tee_shm_find_by_va);
+
+struct tee_shm *tee_shm_find_by_pa(struct tee_device *teedev, u32 flags,
+ phys_addr_t pa)
+{
+ return tee_shm_find_by_key(teedev, flags, cmp_key_pa, pa);
+}
+EXPORT_SYMBOL_GPL(tee_shm_find_by_pa);
+
+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, (u_long)va - (u_long)shm->kaddr, pa);
+}
+EXPORT_SYMBOL_GPL(tee_shm_va2pa);
+
+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);
+
+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);
+
+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);
+
+static bool is_shm_dma_buf(struct dma_buf *dmabuf)
+{
+ return dmabuf->ops == &tee_shm_dma_buf_ops;
+}
+
+struct tee_shm *tee_shm_get_from_fd(int fd)
+{
+ struct dma_buf *dmabuf = dma_buf_get(fd);
+
+ if (IS_ERR(dmabuf))
+ return ERR_CAST(dmabuf);
+
+ if (!is_shm_dma_buf(dmabuf)) {
+ dma_buf_put(dmabuf);
+ return ERR_PTR(-EINVAL);
+ }
+ return dmabuf->priv;
+}
+EXPORT_SYMBOL_GPL(tee_shm_get_from_fd);
+
+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..c1d2092
--- /dev/null
+++ b/drivers/tee/tee_shm_pool.c
@@ -0,0 +1,246 @@
+/*
+ * 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/slab.h>
+#include <linux/genalloc.h>
+#ifdef CONFIG_CMA
+#include <linux/cma.h>
+#include <linux/dma-contiguous.h>
+#endif
+#include <linux/tee/tee_drv.h>
+#include "tee_private.h"
+
+#define SHM_POOL_NUM_PRIV_PAGES 1
+
+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,
+};
+
+#ifdef CONFIG_CMA
+static int pool_op_cma_alloc(struct tee_shm_pool_mgr *poolm,
+ struct tee_shm *shm, size_t size)
+{
+ unsigned long order = get_order(PAGE_SIZE);
+ size_t count;
+ struct page *pages;
+
+ /*
+ * It's not valid to call this function with size = 0, but if size
+ * is 0 we'll get a very large number and the allocation will fail.
+ */
+ count = ((size - 1) >> PAGE_SHIFT) + 1;
+ pages = cma_alloc(poolm->private_data, count, order);
+ if (!pages)
+ return -ENOMEM;
+ shm->kaddr = page_address(pages);
+ shm->pages = pages;
+ shm->paddr = virt_to_phys(shm->kaddr);
+ shm->size = count << PAGE_SHIFT;
+ return 0;
+}
+
+static void pool_op_cma_free(struct tee_shm_pool_mgr *poolm,
+ struct tee_shm *shm)
+{
+ size_t count;
+
+ count = shm->size >> PAGE_SHIFT;
+ cma_release(poolm->private_data, shm->pages, count);
+ shm->kaddr = NULL;
+}
+
+static const struct tee_shm_pool_mgr_ops pool_ops_cma = {
+ .alloc = pool_op_cma_alloc,
+ .free = pool_op_cma_free,
+};
+
+static void pool_cma_destroy(struct tee_shm_pool *pool)
+{
+ gen_pool_destroy(pool->private_mgr.private_data);
+ cma_release(pool->dma_buf_mgr.private_data, pool->private_data,
+ SHM_POOL_NUM_PRIV_PAGES);
+}
+
+struct tee_shm_pool *tee_shm_pool_alloc_cma(struct device *dev, u_long *vaddr,
+ phys_addr_t *paddr, size_t *size)
+{
+ struct cma *cma = dev_get_cma_area(dev);
+ struct tee_shm_pool *pool;
+ struct page *page = NULL;
+ size_t order = get_order(PAGE_SIZE);
+ struct gen_pool *genpool = NULL;
+ void *va;
+ int ret;
+
+ pool = kzalloc(sizeof(*pool), GFP_KERNEL);
+ if (!pool) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ page = cma_alloc(cma, SHM_POOL_NUM_PRIV_PAGES, order);
+ if (!page) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ genpool = gen_pool_create(get_order(8), -1);
+ if (!genpool) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ gen_pool_set_algo(genpool, gen_pool_best_fit, NULL);
+
+ va = page_address(page);
+ ret = gen_pool_add_virt(genpool, (u_long)va, virt_to_phys(va),
+ SHM_POOL_NUM_PRIV_PAGES * PAGE_SIZE, -1);
+ if (ret)
+ goto err;
+
+ pool->private_data = page;
+ pool->private_mgr.private_data = genpool;
+ pool->private_mgr.ops = &pool_ops_generic;
+ pool->dma_buf_mgr.private_data = cma;
+ pool->dma_buf_mgr.ops = &pool_ops_cma;
+ pool->destroy = pool_cma_destroy;
+
+ *paddr = cma_get_base(cma);
+ *vaddr = (u_long)phys_to_virt(*paddr);
+ *size = cma_get_size(cma);
+ return pool;
+err:
+ dev_err(dev, "can't allocate memory for CMA shared memory pool\n");
+ if (genpool)
+ gen_pool_destroy(genpool);
+ if (page)
+ cma_release(cma, page, SHM_POOL_NUM_PRIV_PAGES);
+ kfree(pool);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_cma);
+#endif
+
+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);
+}
+
+struct tee_shm_pool *tee_shm_pool_alloc_res_mem(struct device *dev,
+ u_long vaddr, phys_addr_t paddr, size_t size)
+{
+ size_t page_mask = PAGE_SIZE - 1;
+ size_t priv_size = PAGE_SIZE * SHM_POOL_NUM_PRIV_PAGES;
+ struct tee_shm_pool *pool = NULL;
+ struct gen_pool *genpool = NULL;
+ int ret;
+
+ /*
+ * Start and end must be page aligned
+ */
+ if ((vaddr & page_mask) || (paddr & page_mask) || (size & page_mask)) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ /*
+ * Wouldn't make sense to have less than twice the number of
+ * private pages, in practice the size has to be much larger, but
+ * this is the absolute minimum.
+ */
+ if (size < priv_size * 2) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ pool = kzalloc(sizeof(*pool), GFP_KERNEL);
+ if (!pool) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ /*
+ * Create the pool for driver private shared memory
+ */
+ genpool = gen_pool_create(3 /* 8 byte aligned */, -1);
+ if (!genpool) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ gen_pool_set_algo(genpool, gen_pool_best_fit, NULL);
+ ret = gen_pool_add_virt(genpool, vaddr, paddr, priv_size, -1);
+ if (ret)
+ goto err;
+ pool->private_mgr.private_data = genpool;
+ pool->private_mgr.ops = &pool_ops_generic;
+
+ /*
+ * Create the pool for dma_buf shared memory
+ */
+ genpool = gen_pool_create(PAGE_SHIFT, -1);
+ gen_pool_set_algo(genpool, gen_pool_best_fit, NULL);
+ if (!genpool) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ ret = gen_pool_add_virt(genpool, vaddr + priv_size, paddr + priv_size,
+ size - priv_size, -1);
+ if (ret)
+ goto err;
+ pool->dma_buf_mgr.private_data = genpool;
+ pool->dma_buf_mgr.ops = &pool_ops_generic;
+ pool->destroy = pool_res_mem_destroy;
+ return pool;
+err:
+ 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);
+ if (genpool)
+ gen_pool_destroy(genpool);
+ kfree(pool);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
+
+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/tee.h b/include/linux/tee/tee.h
new file mode 100644
index 0000000..f1af46b
--- /dev/null
+++ b/include/linux/tee/tee.h
@@ -0,0 +1,180 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef __TEE_H
+#define __TEE_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+/*
+ * This file describes the API provided by the generic TEE driver to user
+ * space
+ */
+
+
+/* Helpers to make the ioctl defines */
+#define TEE_IOC_MAGIC 0xa4
+#define TEE_IOC_BASE 0
+#define _TEE_IOR(nr, size) _IOR(TEE_IOC_MAGIC, TEE_IOC_BASE + (nr), size)
+#define _TEE_IOWR(nr, size) _IOWR(TEE_IOC_MAGIC, TEE_IOC_BASE + (nr), size)
+#define _TEE_IOW(nr, size) _IOW(TEE_IOC_MAGIC, TEE_IOC_BASE + (nr), size)
+
+/*
+ * Version of the generic TEE subsystem, if it doesn't match what's
+ * returned by TEE_IOC_VERSION this header is not in sync with the kernel.
+ */
+#define TEE_SUBSYS_VERSION 1
+
+
+/* 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 */
+
+/**
+ * struct tee_version - TEE versions
+ * @gen_version: [out] Generic TEE driver version
+ * @spec_version: [out] Specific TEE driver version
+ * @uuid: [out] Specific TEE driver uuid, zero if not used
+ *
+ * Identifies the generic TEE driver, and the specific TEE driver.
+ * Used as argument for TEE_IOC_VERSION below.
+ */
+struct tee_ioctl_version {
+ uint32_t gen_version;
+ uint32_t spec_version;
+ uint8_t uuid[16];
+};
+/**
+ * TEE_IOC_VERSION - query version of drivers
+ *
+ * Takes a tee_version struct and returns with the version numbers filled in.
+ */
+#define TEE_IOC_VERSION _TEE_IOR(0, struct tee_ioctl_version)
+
+/**
+ * struct tee_cmd_data - Opaque command argument
+ * @buf_ptr: [in] A __user pointer to a command buffer
+ * @buf_len: [in] Length of the buffer above
+ *
+ * Opaque command data which is passed on to the specific driver. The command
+ * buffer doesn't have to reside in shared memory.
+ * Used as argument for TEE_IOC_CMD below.
+ */
+struct tee_ioctl_cmd_data {
+ uint64_t buf_ptr;
+ uint64_t buf_len;
+};
+/**
+ * TEE_IOC_CMD - pass a command to the specific TEE driver
+ *
+ * Takes tee_cmd_data struct which is passed to the specific TEE driver.
+ */
+#define TEE_IOC_CMD _TEE_IOR(1, struct tee_ioctl_cmd_data)
+
+/**
+ * struct tee_shm_alloc_data - Shared memory allocate argument
+ * @size: [in/out] Size of shared memory to allocate
+ * @flags: [in/out] Flags to/from allocation.
+ * @fd: [out] dma_buf file descriptor 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 {
+ uint64_t size;
+ uint32_t flags;
+ int32_t fd;
+};
+/**
+ * TEE_IOC_SHM_ALLOC - allocate shared memory
+ *
+ * Allocates shared memory between the user space process and secure OS.
+ * 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 _TEE_IOWR(2, struct tee_ioctl_shm_alloc_data)
+
+/**
+ * struct tee_mem_buf - share user space memory with Secure OS
+ * @ptr: A __user pointer to memory to share
+ * @size: Size of the memory to share
+ * Used in 'struct tee_mem_share_data' below.
+ */
+struct tee_ioctl_mem_buf {
+ uint64_t ptr;
+ uint64_t size;
+};
+
+/**
+ * struct tee_mem_dma_buf - share foreign dma_buf memory
+ * @fd: dma_buf file descriptor
+ * @pad: padding, set to zero by caller
+ * Used in 'struct tee_mem_share_data' below.
+ */
+struct tee_ioctl_mem_dma_buf {
+ int32_t fd;
+ uint32_t pad;
+};
+
+/**
+ * struct tee_mem_share_data - share memory with Secure OS
+ * @buf: [in] share user space memory
+ * @dma_buf: [in] share foreign dma_buf memory
+ * @flags: [in/out] Flags to/from sharing.
+ * @pad: [in/out] Padding, set to zero by caller
+ *
+ * The bits in @flags are defined by TEE_IOCTL_SHM_* above, undefined bits
+ * should be seto to zero as input. If TEE_IOCTL_SHM_DMA_BUF is set in the
+ * flags field use the dma_buf field, else the buf field in the union.
+ *
+ * Used as argument for TEE_IOC_MEM_SHARE and TEE_IOC_MEM_UNSHARE below.
+ */
+struct tee_ioctl_mem_share_data {
+ union {
+ struct tee_ioctl_mem_buf buf;
+ struct tee_ioctl_mem_dma_buf dma_buf;
+ };
+ uint32_t flags;
+ uint32_t pad;
+};
+
+/**
+ * TEE_IOC_MEM_SHARE - share a portion of user space memory with secure OS
+ *
+ * Shares a portion of user space memory with secure OS.
+ */
+#define TEE_IOC_MEM_SHARE _TEE_IOWR(3, struct tee_ioctl_mem_share_data)
+
+/**
+ * TEE_IOC_MEM_UNSHARE - unshares a portion shared user space memory
+ *
+ * Unshares a portion of previously shared user space memory.
+ */
+#define TEE_IOC_MEM_UNSHARE _TEE_IOW(4, struct tee_ioctl_mem_share_data)
+
+/*
+ * Five syscalls are used when communicating with the generic TEE driver.
+ * open(): opens the device associated with the driver
+ * ioctl(): as described above operating on the file descripto 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
+ * munmap(): unmaps previously shared memory
+ */
+
+#endif /*__TEE_H*/
diff --git a/include/linux/tee/tee_drv.h b/include/linux/tee/tee_drv.h
new file mode 100644
index 0000000..8309fb4
--- /dev/null
+++ b/include/linux/tee/tee_drv.h
@@ -0,0 +1,271 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef __TEE_DRV_H
+#define __TEE_DRV_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/miscdevice.h>
+#include <linux/tee/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 */
+#define __TEE_SHM_SHARED 0x4 /* Has been shared with secure world */
+
+#define TEE_UUID_SIZE 16
+
+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_driver_ops - driver operations vtable
+ * @get_version: returns version of driver
+ * @open: called when the device file is opened
+ * @release: release this open file
+ * @cmd: process a command from user space
+ * @shm_share: share some memory with Secure OS
+ * @shm_unshare: unshare some memory with Secure OS
+ */
+struct tee_driver_ops {
+ void (*get_version)(struct tee_context *ctx, u32 *version, u8 *uuid);
+ int (*open)(struct tee_context *ctx);
+ void (*release)(struct tee_context *ctx);
+ int (*cmd)(struct tee_context *ctx, void __user *buf, size_t len);
+ int (*shm_share)(struct tee_shm *shm);
+ void (*shm_unshare)(struct tee_shm *shm);
+};
+
+/**
+ * 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_register() - Register a specific TEE driver
+ * @teedesc: Descriptor for this driver
+ * @dev: Parent device for this driver
+ * @driver_data: Private driver data for this driver
+ *
+ * Once the specific driver has been probed it registers in the generic
+ * driver with this function.
+ *
+ * @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure
+ */
+struct tee_device *tee_register(const struct tee_desc *teedesc,
+ struct device *dev, struct tee_shm_pool *pool,
+ void *driver_data);
+
+/**
+ * tee_unregister() - Unregister a specific TEE driver
+ * @teedev: Driver to unregister
+ */
+void tee_unregister(struct tee_device *teedev);
+
+/**
+ * tee_shm_pool_alloc_cma() - Create a shared memory pool based on device default CMA area
+ * @dev: Device to get default CMA area from
+ * @vaddr: Returned virtual address of start of CMA area
+ * @paddr: Returned physical address of start of CMA area
+ * @size: Returned size of CMA area
+ * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
+ */
+#ifdef CONFIG_CMA
+struct tee_shm_pool *tee_shm_pool_alloc_cma(struct device *dev, u_long *vaddr,
+ phys_addr_t *paddr, size_t *size);
+#else
+struct tee_shm_pool *tee_shm_pool_alloc_cma(struct device *dev, u_long *vaddr,
+ phys_addr_t *paddr, size_t *size)
+{
+ return ERR_PTR(-ENOENT);
+}
+#endif
+
+/**
+ * tee_shm_pool_alloc_res_mem() - Create a shared memory pool a reserved memory range
+ * @dev: Device allocating the pool
+ * @vaddr: Virtual address of start of pool
+ * @paddr: Physical address of start of pool
+ * @size: Size in bytes of the pool
+ *
+ * Start of pool will be rounded up to the nearest page, end of pool will
+ * be rounded down to the nearest page.
+ *
+ * @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,
+ u_long vaddr, phys_addr_t paddr, size_t size);
+
+/**
+ * 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_find_by_va() - Find a shared memory handle by a virtual address
+ * @teedev: The device that owns the shared memory
+ * @flags: Select which type of shared memory to locate, if
+ * TEE_SHM_DMA_BUF global shared memory else driver private
+ * shared memory.
+ * @va: Virtual address covered by the shared memory
+ * @returns a Handle to shared memory
+ */
+struct tee_shm *tee_shm_find_by_va(struct tee_device *teedev, u32 flags,
+ void *va);
+/**
+ * tee_shm_find_by_pa() - Find a shared memory handle by a physical address
+ * @teedev: The device that owns the shared memory
+ * @flags: Select which type of shared memory to locate, if
+ * TEE_SHM_DMA_BUF global shared memory else driver private
+ * shared memory.
+ * @pa: Physical address covered by the shared memory
+ * @returns a Handle to shared memory
+ */
+struct tee_shm *tee_shm_find_by_pa(struct tee_device *teedev, u32 flags,
+ phys_addr_t pa);
+
+/**
+ * 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_size() - Get size of a shared memory
+ * @returns the size of the shared memory
+ */
+size_t tee_shm_get_size(struct tee_shm *shm);
+
+/**
+ * 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_from_fd() - Get a shared memory handle from a file descriptor
+ * @fd: A user space file descriptor
+ *
+ * This function increases the reference counter on the shared memory and
+ * returns a handle.
+ * @returns handle to shared memory
+ */
+struct tee_shm *tee_shm_get_from_fd(int fd);
+
+/**
+ * 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_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);
+
+/**
+ * tee_shm_put_fd() - Decrease reference count and close file descriptor
+ * @fd: File descriptor to close
+ * @returns < 0 on failure
+ */
+int tee_shm_put_fd(int fd);
+
+#endif /*__TEE_DRV_H*/
--
1.9.1


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