linux/drivers/tee/optee/device.c
Jens Wiklander 5d41f1b3e3 tee: replace tee_shm_alloc()
tee_shm_alloc() is replaced by three new functions,

tee_shm_alloc_user_buf() - for user mode allocations, replacing passing
the flags TEE_SHM_MAPPED | TEE_SHM_DMA_BUF

tee_shm_alloc_kernel_buf() - for kernel mode allocations, slightly
optimized compared to using the flags TEE_SHM_MAPPED | TEE_SHM_DMA_BUF.

tee_shm_alloc_priv_buf() - primarily for TEE driver internal use.

This also makes the interface easier to use as we can get rid of the
somewhat hard to use flags parameter.

The TEE subsystem and the TEE drivers are updated to use the new
functions instead.

Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
2022-02-16 07:49:41 +01:00

178 lines
4.1 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2019 Linaro Ltd.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include <linux/uuid.h>
#include "optee_private.h"
static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
{
if (ver->impl_id == TEE_IMPL_ID_OPTEE)
return 1;
else
return 0;
}
static int get_devices(struct tee_context *ctx, u32 session,
struct tee_shm *device_shm, u32 *shm_size,
u32 func)
{
int ret = 0;
struct tee_ioctl_invoke_arg inv_arg;
struct tee_param param[4];
memset(&inv_arg, 0, sizeof(inv_arg));
memset(&param, 0, sizeof(param));
inv_arg.func = func;
inv_arg.session = session;
inv_arg.num_params = 4;
/* Fill invoke cmd params */
param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT;
param[0].u.memref.shm = device_shm;
param[0].u.memref.size = *shm_size;
param[0].u.memref.shm_offs = 0;
ret = tee_client_invoke_func(ctx, &inv_arg, param);
if ((ret < 0) || ((inv_arg.ret != TEEC_SUCCESS) &&
(inv_arg.ret != TEEC_ERROR_SHORT_BUFFER))) {
pr_err("PTA_CMD_GET_DEVICES invoke function err: %x\n",
inv_arg.ret);
return -EINVAL;
}
*shm_size = param[0].u.memref.size;
return 0;
}
static void optee_release_device(struct device *dev)
{
struct tee_client_device *optee_device = to_tee_client_device(dev);
kfree(optee_device);
}
static int optee_register_device(const uuid_t *device_uuid)
{
struct tee_client_device *optee_device = NULL;
int rc;
optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL);
if (!optee_device)
return -ENOMEM;
optee_device->dev.bus = &tee_bus_type;
optee_device->dev.release = optee_release_device;
if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
kfree(optee_device);
return -ENOMEM;
}
uuid_copy(&optee_device->id.uuid, device_uuid);
rc = device_register(&optee_device->dev);
if (rc) {
pr_err("device registration failed, err: %d\n", rc);
kfree(optee_device);
}
return rc;
}
static int __optee_enumerate_devices(u32 func)
{
const uuid_t pta_uuid =
UUID_INIT(0x7011a688, 0xddde, 0x4053,
0xa5, 0xa9, 0x7b, 0x3c, 0x4d, 0xdf, 0x13, 0xb8);
struct tee_ioctl_open_session_arg sess_arg;
struct tee_shm *device_shm = NULL;
const uuid_t *device_uuid = NULL;
struct tee_context *ctx = NULL;
u32 shm_size = 0, idx, num_devices = 0;
int rc;
memset(&sess_arg, 0, sizeof(sess_arg));
/* Open context with OP-TEE driver */
ctx = tee_client_open_context(NULL, optee_ctx_match, NULL, NULL);
if (IS_ERR(ctx))
return -ENODEV;
/* Open session with device enumeration pseudo TA */
export_uuid(sess_arg.uuid, &pta_uuid);
sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
sess_arg.num_params = 0;
rc = tee_client_open_session(ctx, &sess_arg, NULL);
if ((rc < 0) || (sess_arg.ret != TEEC_SUCCESS)) {
/* Device enumeration pseudo TA not found */
rc = 0;
goto out_ctx;
}
rc = get_devices(ctx, sess_arg.session, NULL, &shm_size, func);
if (rc < 0 || !shm_size)
goto out_sess;
device_shm = tee_shm_alloc_kernel_buf(ctx, shm_size);
if (IS_ERR(device_shm)) {
pr_err("tee_shm_alloc_kernel_buf failed\n");
rc = PTR_ERR(device_shm);
goto out_sess;
}
rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size, func);
if (rc < 0)
goto out_shm;
device_uuid = tee_shm_get_va(device_shm, 0);
if (IS_ERR(device_uuid)) {
pr_err("tee_shm_get_va failed\n");
rc = PTR_ERR(device_uuid);
goto out_shm;
}
num_devices = shm_size / sizeof(uuid_t);
for (idx = 0; idx < num_devices; idx++) {
rc = optee_register_device(&device_uuid[idx]);
if (rc)
goto out_shm;
}
out_shm:
tee_shm_free(device_shm);
out_sess:
tee_client_close_session(ctx, sess_arg.session);
out_ctx:
tee_client_close_context(ctx);
return rc;
}
int optee_enumerate_devices(u32 func)
{
return __optee_enumerate_devices(func);
}
static int __optee_unregister_device(struct device *dev, void *data)
{
if (!strncmp(dev_name(dev), "optee-ta", strlen("optee-ta")))
device_unregister(dev);
return 0;
}
void optee_unregister_devices(void)
{
bus_for_each_dev(&tee_bus_type, NULL, NULL,
__optee_unregister_device);
}