// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2019 Broadcom.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include <linux/uuid.h>
#include <linux/firmware/broadcom/tee_bnxt_fw.h>
#define MAX_SHM_MEM_SZ SZ_4M
#define MAX_TEE_PARAM_ARRY_MEMB 4
enum ta_cmd {
/*
* TA_CMD_BNXT_FASTBOOT - boot bnxt device by copying f/w into sram
*
* param[0] unused
* param[1] unused
* param[2] unused
* param[3] unused
*
* Result:
* TEE_SUCCESS - Invoke command success
* TEE_ERROR_ITEM_NOT_FOUND - Corrupt f/w image found on memory
*/
TA_CMD_BNXT_FASTBOOT = 0,
/*
* TA_CMD_BNXT_COPY_COREDUMP - copy the core dump into shm
*
* param[0] (inout memref) - Coredump buffer memory reference
* param[1] (in value) - value.a: offset, data to be copied from
* value.b: size of data to be copied
* param[2] unused
* param[3] unused
*
* Result:
* TEE_SUCCESS - Invoke command success
* TEE_ERROR_BAD_PARAMETERS - Incorrect input param
* TEE_ERROR_ITEM_NOT_FOUND - Corrupt core dump
*/
TA_CMD_BNXT_COPY_COREDUMP = 3,
};
/**
* struct tee_bnxt_fw_private - OP-TEE bnxt private data
* @dev: OP-TEE based bnxt device.
* @ctx: OP-TEE context handler.
* @session_id: TA session identifier.
*/
struct tee_bnxt_fw_private {
struct device *dev;
struct tee_context *ctx;
u32 session_id;
struct tee_shm *fw_shm_pool;
};
static struct tee_bnxt_fw_private pvt_data;
static void prepare_args(int cmd,
struct tee_ioctl_invoke_arg *arg,
struct tee_param *param)
{
memset(arg, 0, sizeof(*arg));
memset(param, 0, MAX_TEE_PARAM_ARRY_MEMB * sizeof(*param));
arg->func = cmd;
arg->session = pvt_data.session_id;
arg->num_params = MAX_TEE_PARAM_ARRY_MEMB;
/* Fill invoke cmd params */
switch (cmd) {
case TA_CMD_BNXT_COPY_COREDUMP:
param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT;
param[0].u.memref.shm = pvt_data.fw_shm_pool;
param[0].u.memref.size = MAX_SHM_MEM_SZ;
param[0].u.memref.shm_offs = 0;
param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
break;
case TA_CMD_BNXT_FASTBOOT:
default:
/* Nothing to do */
break;
}
}
/**
* tee_bnxt_fw_load() - Load the bnxt firmware
* Uses an OP-TEE call to start a secure
* boot process.
* Returns 0 on success, negative errno otherwise.
*/
int tee_bnxt_fw_load(void)
{
int ret = 0;
struct tee_ioctl_invoke_arg arg;
struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB];
if (!pvt_data.ctx)
return -ENODEV;
prepare_args(TA_CMD_BNXT_FASTBOOT, &arg, param);
ret = tee_client_invoke_func(pvt_data.ctx, &arg, param);
if (ret < 0 || arg.ret != 0) {
dev_err(pvt_data.dev,
"TA_CMD_BNXT_FASTBOOT invoke failed TEE err: %x, ret:%x\n",
arg.ret, ret);
return -EINVAL;
}
return 0;
}
EXPORT_SYMBOL(tee_bnxt_fw_load);
/**
* tee_bnxt_copy_coredump() - Copy coredump from the allocated memory
* Uses an OP-TEE call to copy coredump
* @buf: destination buffer where core dump is copied into
* @offset: offset from the base address of core dump area
* @size: size of the dump
*
* Returns 0 on success, negative errno otherwise.
*/
int tee_bnxt_copy_coredump(void *buf, u32 offset, u32 size)
{
struct tee_ioctl_invoke_arg arg;
struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB];
void *core_data;
u32 rbytes = size;
u32 nbytes = 0;
int ret = 0;
if (!pvt_data.ctx)
return -ENODEV;
prepare_args(TA_CMD_BNXT_COPY_COREDUMP, &arg, param);
while (rbytes) {
nbytes = rbytes;
nbytes = min_t(u32, rbytes, param[0].u.memref.size);
/* Fill additional invoke cmd params */
param[1].u.value.a = offset;
param[1].u.value.b = nbytes;
ret = tee_client_invoke_func(pvt_data.ctx, &arg, param);
if (ret < 0 || arg.ret != 0) {
dev_err(pvt_data.dev,
"TA_CMD_BNXT_COPY_COREDUMP invoke failed TEE err: %x, ret:%x\n",
arg.ret, ret);
return -EINVAL;
}
core_data = tee_shm_get_va(pvt_data.fw_shm_pool, 0);
if (IS_ERR(core_data)) {
dev_err(pvt_data.dev, "tee_shm_get_va failed\n");
return PTR_ERR(core_data);
}
memcpy(buf, core_data, nbytes);
rbytes -= nbytes;
buf += nbytes;
offset += nbytes;
}
return 0;
}
EXPORT_SYMBOL(tee_bnxt_copy_coredump);
static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
{
return (ver->impl_id == TEE_IMPL_ID_OPTEE);
}
static int tee_bnxt_fw_probe(struct device *dev)
{
struct tee_client_device *bnxt_device = to_tee_client_device(dev);
int ret, err = -ENODEV;
struct tee_ioctl_open_session_arg sess_arg;
struct tee_shm *fw_shm_pool;
memset(&sess_arg, 0, sizeof(sess_arg));
/* Open context with TEE driver */
pvt_data.ctx = tee_client_open_context(NULL, optee_ctx_match, NULL,
NULL);
if (IS_ERR(pvt_data.ctx))
return -ENODEV;
/* Open session with Bnxt load Trusted App */
export_uuid(sess_arg.uuid, &bnxt_device->id.uuid);
sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
sess_arg.num_params = 0;
ret = tee_client_open_session(pvt_data.ctx, &sess_arg, NULL);
if (ret < 0 || sess_arg.ret != 0) {
dev_err(dev, "tee_client_open_session failed, err: %x\n",
sess_arg.ret);
err = -EINVAL;
goto out_ctx;
}
pvt_data.session_id = sess_arg.session;
pvt_data.dev = dev;
fw_shm_pool = tee_shm_alloc_kernel_buf(pvt_data.ctx, MAX_SHM_MEM_SZ);
if (IS_ERR(fw_shm_pool)) {
dev_err(pvt_data.dev, "tee_shm_alloc_kernel_buf failed\n");
err = PTR_ERR(fw_shm_pool);
goto out_sess;
}
pvt_data.fw_shm_pool = fw_shm_pool;
return 0;
out_sess:
tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
out_ctx:
tee_client_close_context(pvt_data.ctx);
return err;
}
static int tee_bnxt_fw_remove(struct device *dev)
{
tee_shm_free(pvt_data.fw_shm_pool);
tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
tee_client_close_context(pvt_data.ctx);
pvt_data.ctx = NULL;
return 0;
}
static void tee_bnxt_fw_shutdown(struct device *dev)
{
tee_shm_free(pvt_data.fw_shm_pool);
tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
tee_client_close_context(pvt_data.ctx);
pvt_data.ctx = NULL;
}
static const struct tee_client_device_id tee_bnxt_fw_id_table[] = {
{UUID_INIT(0x6272636D, 0x2019, 0x0716,
0x42, 0x43, 0x4D, 0x5F, 0x53, 0x43, 0x48, 0x49)},
{}
};
MODULE_DEVICE_TABLE(tee, tee_bnxt_fw_id_table);
static struct tee_client_driver tee_bnxt_fw_driver = {
.id_table = tee_bnxt_fw_id_table,
.driver = {
.name = KBUILD_MODNAME,
.bus = &tee_bus_type,
.probe = tee_bnxt_fw_probe,
.remove = tee_bnxt_fw_remove,
.shutdown = tee_bnxt_fw_shutdown,
},
};
static int __init tee_bnxt_fw_mod_init(void)
{
return driver_register(&tee_bnxt_fw_driver.driver);
}
static void __exit tee_bnxt_fw_mod_exit(void)
{
driver_unregister(&tee_bnxt_fw_driver.driver);
}
module_init(tee_bnxt_fw_mod_init);
module_exit(tee_bnxt_fw_mod_exit);
MODULE_AUTHOR("Vikas Gupta <[email protected]>");
MODULE_DESCRIPTION("Broadcom bnxt firmware manager");
MODULE_LICENSE("GPL v2");
Codebase Browser
linux