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https://github.com/brain-hackers/u-boot-brain
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![Sean Anderson](/assets/img/avatar_default.png)
Necessary for dev_xxx. Signed-off-by: Sean Anderson <seanga2@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
667 lines
16 KiB
C
667 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2018 Linaro Limited
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*/
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#include <common.h>
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#include <dm.h>
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#include <dm/device_compat.h>
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#include <log.h>
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#include <malloc.h>
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#include <tee.h>
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#include <linux/arm-smccc.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include "optee_smc.h"
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#include "optee_msg.h"
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#include "optee_private.h"
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#define PAGELIST_ENTRIES_PER_PAGE \
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((OPTEE_MSG_NONCONTIG_PAGE_SIZE / sizeof(u64)) - 1)
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typedef void (optee_invoke_fn)(unsigned long, unsigned long, unsigned long,
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unsigned long, unsigned long, unsigned long,
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unsigned long, unsigned long,
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struct arm_smccc_res *);
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struct optee_pdata {
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optee_invoke_fn *invoke_fn;
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};
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struct rpc_param {
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u32 a0;
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u32 a1;
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u32 a2;
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u32 a3;
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u32 a4;
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u32 a5;
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u32 a6;
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u32 a7;
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};
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/**
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* reg_pair_to_ptr() - Make a pointer of 2 32-bit values
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* @reg0: High bits of the pointer
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* @reg1: Low bits of the pointer
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*
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* Returns the combined result, note that if a pointer is 32-bit wide @reg0
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* will be discarded.
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*/
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static void *reg_pair_to_ptr(u32 reg0, u32 reg1)
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{
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return (void *)(ulong)(((u64)reg0 << 32) | reg1);
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}
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/**
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* reg_pair_from_64() - Split a 64-bit value into two 32-bit values
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* @reg0: High bits of @val
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* @reg1: Low bits of @val
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* @val: The value to split
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*/
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static void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val)
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{
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*reg0 = val >> 32;
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*reg1 = val;
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}
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/**
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* optee_alloc_and_init_page_list() - Provide page list of memory buffer
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* @buf: Start of buffer
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* @len: Length of buffer
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* @phys_buf_ptr Physical pointer with coded offset to page list
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*
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* Secure world doesn't share mapping with Normal world (U-Boot in this case)
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* so physical pointers are needed when sharing pointers.
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*
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* Returns a pointer page list on success or NULL on failure
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*/
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void *optee_alloc_and_init_page_list(void *buf, ulong len, u64 *phys_buf_ptr)
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{
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const unsigned int page_size = OPTEE_MSG_NONCONTIG_PAGE_SIZE;
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const phys_addr_t page_mask = page_size - 1;
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u8 *buf_base;
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unsigned int page_offset;
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unsigned int num_pages;
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unsigned int list_size;
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unsigned int n;
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void *page_list;
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struct {
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u64 pages_list[PAGELIST_ENTRIES_PER_PAGE];
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u64 next_page_data;
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} *pages_data;
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/*
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* A Memory buffer is described in chunks of 4k. The list of
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* physical addresses has to be represented by a physical pointer
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* too and a single list has to start at a 4k page and fit into
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* that page. In order to be able to describe large memory buffers
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* these 4k pages carrying physical addresses are linked together
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* in a list. See OPTEE_MSG_ATTR_NONCONTIG in
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* drivers/tee/optee/optee_msg.h for more information.
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*/
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page_offset = (ulong)buf & page_mask;
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num_pages = roundup(page_offset + len, page_size) / page_size;
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list_size = DIV_ROUND_UP(num_pages, PAGELIST_ENTRIES_PER_PAGE) *
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page_size;
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page_list = memalign(page_size, list_size);
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if (!page_list)
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return NULL;
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pages_data = page_list;
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buf_base = (u8 *)rounddown((ulong)buf, page_size);
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n = 0;
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while (num_pages) {
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pages_data->pages_list[n] = virt_to_phys(buf_base);
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n++;
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buf_base += page_size;
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num_pages--;
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if (n == PAGELIST_ENTRIES_PER_PAGE) {
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pages_data->next_page_data =
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virt_to_phys(pages_data + 1);
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pages_data++;
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n = 0;
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}
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}
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*phys_buf_ptr = virt_to_phys(page_list) | page_offset;
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return page_list;
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}
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static void optee_get_version(struct udevice *dev,
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struct tee_version_data *vers)
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{
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struct tee_version_data v = {
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.gen_caps = TEE_GEN_CAP_GP | TEE_GEN_CAP_REG_MEM,
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};
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*vers = v;
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}
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static int get_msg_arg(struct udevice *dev, uint num_params,
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struct tee_shm **shmp, struct optee_msg_arg **msg_arg)
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{
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int rc;
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struct optee_msg_arg *ma;
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rc = __tee_shm_add(dev, OPTEE_MSG_NONCONTIG_PAGE_SIZE, NULL,
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OPTEE_MSG_GET_ARG_SIZE(num_params), TEE_SHM_ALLOC,
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shmp);
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if (rc)
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return rc;
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ma = (*shmp)->addr;
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memset(ma, 0, OPTEE_MSG_GET_ARG_SIZE(num_params));
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ma->num_params = num_params;
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*msg_arg = ma;
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return 0;
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}
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static int to_msg_param(struct optee_msg_param *msg_params, uint num_params,
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const struct tee_param *params)
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{
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uint n;
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for (n = 0; n < num_params; n++) {
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const struct tee_param *p = params + n;
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struct optee_msg_param *mp = msg_params + n;
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switch (p->attr) {
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case TEE_PARAM_ATTR_TYPE_NONE:
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mp->attr = OPTEE_MSG_ATTR_TYPE_NONE;
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memset(&mp->u, 0, sizeof(mp->u));
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break;
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case TEE_PARAM_ATTR_TYPE_VALUE_INPUT:
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case TEE_PARAM_ATTR_TYPE_VALUE_OUTPUT:
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case TEE_PARAM_ATTR_TYPE_VALUE_INOUT:
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mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
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TEE_PARAM_ATTR_TYPE_VALUE_INPUT;
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mp->u.value.a = p->u.value.a;
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mp->u.value.b = p->u.value.b;
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mp->u.value.c = p->u.value.c;
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break;
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case TEE_PARAM_ATTR_TYPE_MEMREF_INPUT:
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case TEE_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
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case TEE_PARAM_ATTR_TYPE_MEMREF_INOUT:
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mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
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TEE_PARAM_ATTR_TYPE_MEMREF_INPUT;
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mp->u.rmem.shm_ref = (ulong)p->u.memref.shm;
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mp->u.rmem.size = p->u.memref.size;
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mp->u.rmem.offs = p->u.memref.shm_offs;
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break;
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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static int from_msg_param(struct tee_param *params, uint num_params,
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const struct optee_msg_param *msg_params)
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{
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uint n;
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struct tee_shm *shm;
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for (n = 0; n < num_params; n++) {
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struct tee_param *p = params + n;
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const struct optee_msg_param *mp = msg_params + n;
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u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
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switch (attr) {
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case OPTEE_MSG_ATTR_TYPE_NONE:
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p->attr = TEE_PARAM_ATTR_TYPE_NONE;
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memset(&p->u, 0, sizeof(p->u));
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break;
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case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
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case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
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case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
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p->attr = TEE_PARAM_ATTR_TYPE_VALUE_INPUT + attr -
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OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
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p->u.value.a = mp->u.value.a;
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p->u.value.b = mp->u.value.b;
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p->u.value.c = mp->u.value.c;
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break;
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case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
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case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
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case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
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p->attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT + attr -
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OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
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p->u.memref.size = mp->u.rmem.size;
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shm = (struct tee_shm *)(ulong)mp->u.rmem.shm_ref;
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if (!shm) {
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p->u.memref.shm_offs = 0;
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p->u.memref.shm = NULL;
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break;
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}
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p->u.memref.shm_offs = mp->u.rmem.offs;
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p->u.memref.shm = shm;
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break;
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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static void handle_rpc(struct udevice *dev, struct rpc_param *param,
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void *page_list)
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{
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struct tee_shm *shm;
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switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
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case OPTEE_SMC_RPC_FUNC_ALLOC:
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if (!__tee_shm_add(dev, OPTEE_MSG_NONCONTIG_PAGE_SIZE, NULL,
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param->a1, TEE_SHM_ALLOC | TEE_SHM_REGISTER,
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&shm)) {
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reg_pair_from_64(¶m->a1, ¶m->a2,
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virt_to_phys(shm->addr));
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/* "cookie" */
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reg_pair_from_64(¶m->a4, ¶m->a5, (ulong)shm);
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} else {
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param->a1 = 0;
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param->a2 = 0;
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param->a4 = 0;
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param->a5 = 0;
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}
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break;
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case OPTEE_SMC_RPC_FUNC_FREE:
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shm = reg_pair_to_ptr(param->a1, param->a2);
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tee_shm_free(shm);
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break;
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case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
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break;
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case OPTEE_SMC_RPC_FUNC_CMD:
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shm = reg_pair_to_ptr(param->a1, param->a2);
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optee_suppl_cmd(dev, shm, page_list);
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break;
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default:
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break;
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}
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param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
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}
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static u32 call_err_to_res(u32 call_err)
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{
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switch (call_err) {
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case OPTEE_SMC_RETURN_OK:
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return TEE_SUCCESS;
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default:
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return TEE_ERROR_BAD_PARAMETERS;
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}
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}
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static u32 do_call_with_arg(struct udevice *dev, struct optee_msg_arg *arg)
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{
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struct optee_pdata *pdata = dev_get_platdata(dev);
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struct rpc_param param = { .a0 = OPTEE_SMC_CALL_WITH_ARG };
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void *page_list = NULL;
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reg_pair_from_64(¶m.a1, ¶m.a2, virt_to_phys(arg));
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while (true) {
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struct arm_smccc_res res;
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pdata->invoke_fn(param.a0, param.a1, param.a2, param.a3,
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param.a4, param.a5, param.a6, param.a7, &res);
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free(page_list);
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page_list = NULL;
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if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
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param.a0 = res.a0;
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param.a1 = res.a1;
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param.a2 = res.a2;
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param.a3 = res.a3;
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handle_rpc(dev, ¶m, &page_list);
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} else {
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/*
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* In case we've accessed RPMB to serve an RPC
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* request we need to restore the previously
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* selected partition as the caller may expect it
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* to remain unchanged.
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*/
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optee_suppl_rpmb_release(dev);
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return call_err_to_res(res.a0);
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}
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}
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}
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static int optee_close_session(struct udevice *dev, u32 session)
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{
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int rc;
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struct tee_shm *shm;
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struct optee_msg_arg *msg_arg;
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rc = get_msg_arg(dev, 0, &shm, &msg_arg);
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if (rc)
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return rc;
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msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
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msg_arg->session = session;
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do_call_with_arg(dev, msg_arg);
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tee_shm_free(shm);
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return 0;
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}
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static int optee_open_session(struct udevice *dev,
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struct tee_open_session_arg *arg,
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uint num_params, struct tee_param *params)
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{
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int rc;
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struct tee_shm *shm;
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struct optee_msg_arg *msg_arg;
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rc = get_msg_arg(dev, num_params + 2, &shm, &msg_arg);
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if (rc)
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return rc;
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msg_arg->cmd = OPTEE_MSG_CMD_OPEN_SESSION;
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/*
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* Initialize and add the meta parameters needed when opening a
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* session.
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*/
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msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
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OPTEE_MSG_ATTR_META;
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msg_arg->params[1].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
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OPTEE_MSG_ATTR_META;
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memcpy(&msg_arg->params[0].u.value, arg->uuid, sizeof(arg->uuid));
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memcpy(&msg_arg->params[1].u.value, arg->uuid, sizeof(arg->clnt_uuid));
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msg_arg->params[1].u.value.c = arg->clnt_login;
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rc = to_msg_param(msg_arg->params + 2, num_params, params);
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if (rc)
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goto out;
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arg->ret = do_call_with_arg(dev, msg_arg);
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if (arg->ret) {
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arg->ret_origin = TEE_ORIGIN_COMMS;
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goto out;
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}
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if (from_msg_param(params, num_params, msg_arg->params + 2)) {
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arg->ret = TEE_ERROR_COMMUNICATION;
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arg->ret_origin = TEE_ORIGIN_COMMS;
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/* Close session again to avoid leakage */
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optee_close_session(dev, msg_arg->session);
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goto out;
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}
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arg->session = msg_arg->session;
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arg->ret = msg_arg->ret;
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arg->ret_origin = msg_arg->ret_origin;
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out:
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tee_shm_free(shm);
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return rc;
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}
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static int optee_invoke_func(struct udevice *dev, struct tee_invoke_arg *arg,
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uint num_params, struct tee_param *params)
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{
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struct tee_shm *shm;
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struct optee_msg_arg *msg_arg;
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int rc;
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rc = get_msg_arg(dev, num_params, &shm, &msg_arg);
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if (rc)
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return rc;
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msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
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msg_arg->func = arg->func;
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msg_arg->session = arg->session;
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rc = to_msg_param(msg_arg->params, num_params, params);
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if (rc)
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goto out;
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arg->ret = do_call_with_arg(dev, msg_arg);
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if (arg->ret) {
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arg->ret_origin = TEE_ORIGIN_COMMS;
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goto out;
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}
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if (from_msg_param(params, num_params, msg_arg->params)) {
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arg->ret = TEE_ERROR_COMMUNICATION;
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arg->ret_origin = TEE_ORIGIN_COMMS;
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goto out;
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}
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arg->ret = msg_arg->ret;
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arg->ret_origin = msg_arg->ret_origin;
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out:
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tee_shm_free(shm);
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return rc;
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}
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static int optee_shm_register(struct udevice *dev, struct tee_shm *shm)
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{
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struct tee_shm *shm_arg;
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struct optee_msg_arg *msg_arg;
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void *pl;
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u64 ph_ptr;
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int rc;
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rc = get_msg_arg(dev, 1, &shm_arg, &msg_arg);
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if (rc)
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return rc;
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pl = optee_alloc_and_init_page_list(shm->addr, shm->size, &ph_ptr);
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if (!pl) {
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rc = -ENOMEM;
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goto out;
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}
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msg_arg->cmd = OPTEE_MSG_CMD_REGISTER_SHM;
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msg_arg->params->attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
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OPTEE_MSG_ATTR_NONCONTIG;
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msg_arg->params->u.tmem.buf_ptr = ph_ptr;
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msg_arg->params->u.tmem.shm_ref = (ulong)shm;
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msg_arg->params->u.tmem.size = shm->size;
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if (do_call_with_arg(dev, msg_arg) || msg_arg->ret)
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rc = -EINVAL;
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free(pl);
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out:
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tee_shm_free(shm_arg);
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return rc;
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}
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static int optee_shm_unregister(struct udevice *dev, struct tee_shm *shm)
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{
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struct tee_shm *shm_arg;
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struct optee_msg_arg *msg_arg;
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int rc;
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rc = get_msg_arg(dev, 1, &shm_arg, &msg_arg);
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if (rc)
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return rc;
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msg_arg->cmd = OPTEE_MSG_CMD_UNREGISTER_SHM;
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msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
|
|
msg_arg->params[0].u.rmem.shm_ref = (ulong)shm;
|
|
|
|
if (do_call_with_arg(dev, msg_arg) || msg_arg->ret)
|
|
rc = -EINVAL;
|
|
tee_shm_free(shm_arg);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static const struct tee_driver_ops optee_ops = {
|
|
.get_version = optee_get_version,
|
|
.open_session = optee_open_session,
|
|
.close_session = optee_close_session,
|
|
.invoke_func = optee_invoke_func,
|
|
.shm_register = optee_shm_register,
|
|
.shm_unregister = optee_shm_unregister,
|
|
};
|
|
|
|
static bool is_optee_api(optee_invoke_fn *invoke_fn)
|
|
{
|
|
struct arm_smccc_res res;
|
|
|
|
invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
|
|
|
|
return res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
|
|
res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3;
|
|
}
|
|
|
|
static void print_os_revision(struct udevice *dev, optee_invoke_fn *invoke_fn)
|
|
{
|
|
union {
|
|
struct arm_smccc_res smccc;
|
|
struct optee_smc_call_get_os_revision_result result;
|
|
} res = {
|
|
.result = {
|
|
.build_id = 0
|
|
}
|
|
};
|
|
|
|
invoke_fn(OPTEE_SMC_CALL_GET_OS_REVISION, 0, 0, 0, 0, 0, 0, 0,
|
|
&res.smccc);
|
|
|
|
if (res.result.build_id)
|
|
dev_info(dev, "OP-TEE: revision %lu.%lu (%08lx)\n",
|
|
res.result.major, res.result.minor,
|
|
res.result.build_id);
|
|
else
|
|
dev_info(dev, "OP-TEE: revision %lu.%lu\n",
|
|
res.result.major, res.result.minor);
|
|
}
|
|
|
|
static bool api_revision_is_compatible(optee_invoke_fn *invoke_fn)
|
|
{
|
|
union {
|
|
struct arm_smccc_res smccc;
|
|
struct optee_smc_calls_revision_result result;
|
|
} res;
|
|
|
|
invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
|
|
|
|
return res.result.major == OPTEE_MSG_REVISION_MAJOR &&
|
|
(int)res.result.minor >= OPTEE_MSG_REVISION_MINOR;
|
|
}
|
|
|
|
static bool exchange_capabilities(optee_invoke_fn *invoke_fn, u32 *sec_caps)
|
|
{
|
|
union {
|
|
struct arm_smccc_res smccc;
|
|
struct optee_smc_exchange_capabilities_result result;
|
|
} res;
|
|
|
|
invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES,
|
|
OPTEE_SMC_NSEC_CAP_UNIPROCESSOR, 0, 0, 0, 0, 0, 0,
|
|
&res.smccc);
|
|
|
|
if (res.result.status != OPTEE_SMC_RETURN_OK)
|
|
return false;
|
|
|
|
*sec_caps = res.result.capabilities;
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Simple wrapper functions to be able to use a function pointer */
|
|
static void optee_smccc_smc(unsigned long a0, unsigned long a1,
|
|
unsigned long a2, unsigned long a3,
|
|
unsigned long a4, unsigned long a5,
|
|
unsigned long a6, unsigned long a7,
|
|
struct arm_smccc_res *res)
|
|
{
|
|
arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
|
|
}
|
|
|
|
static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
|
|
unsigned long a2, unsigned long a3,
|
|
unsigned long a4, unsigned long a5,
|
|
unsigned long a6, unsigned long a7,
|
|
struct arm_smccc_res *res)
|
|
{
|
|
arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
|
|
}
|
|
|
|
static optee_invoke_fn *get_invoke_func(struct udevice *dev)
|
|
{
|
|
const char *method;
|
|
|
|
debug("optee: looking for conduit method in DT.\n");
|
|
method = ofnode_get_property(dev->node, "method", NULL);
|
|
if (!method) {
|
|
debug("optee: missing \"method\" property\n");
|
|
return ERR_PTR(-ENXIO);
|
|
}
|
|
|
|
if (!strcmp("hvc", method))
|
|
return optee_smccc_hvc;
|
|
else if (!strcmp("smc", method))
|
|
return optee_smccc_smc;
|
|
|
|
debug("optee: invalid \"method\" property: %s\n", method);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
static int optee_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct optee_pdata *pdata = dev_get_platdata(dev);
|
|
|
|
pdata->invoke_fn = get_invoke_func(dev);
|
|
if (IS_ERR(pdata->invoke_fn))
|
|
return PTR_ERR(pdata->invoke_fn);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int optee_probe(struct udevice *dev)
|
|
{
|
|
struct optee_pdata *pdata = dev_get_platdata(dev);
|
|
u32 sec_caps;
|
|
|
|
if (!is_optee_api(pdata->invoke_fn)) {
|
|
debug("%s: OP-TEE api uid mismatch\n", __func__);
|
|
return -ENOENT;
|
|
}
|
|
|
|
print_os_revision(dev, pdata->invoke_fn);
|
|
|
|
if (!api_revision_is_compatible(pdata->invoke_fn)) {
|
|
debug("%s: OP-TEE api revision mismatch\n", __func__);
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* OP-TEE can use both shared memory via predefined pool or as
|
|
* dynamic shared memory provided by normal world. To keep things
|
|
* simple we're only using dynamic shared memory in this driver.
|
|
*/
|
|
if (!exchange_capabilities(pdata->invoke_fn, &sec_caps) ||
|
|
!(sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)) {
|
|
debug("%s: OP-TEE capabilities mismatch\n", __func__);
|
|
return -ENOENT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id optee_match[] = {
|
|
{ .compatible = "linaro,optee-tz" },
|
|
{},
|
|
};
|
|
|
|
U_BOOT_DRIVER(optee) = {
|
|
.name = "optee",
|
|
.id = UCLASS_TEE,
|
|
.of_match = optee_match,
|
|
.ofdata_to_platdata = optee_ofdata_to_platdata,
|
|
.probe = optee_probe,
|
|
.ops = &optee_ops,
|
|
.platdata_auto_alloc_size = sizeof(struct optee_pdata),
|
|
.priv_auto_alloc_size = sizeof(struct optee_private),
|
|
};
|