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optee: isolate smc abi

Browse Source 
Isolate the ABI based on raw SMCs. Code specific to the raw SMC ABI is
moved into smc_abi.c. This makes room for other ABIs with a clear
separation.

The driver changes to use module_init()/module_exit() instead of
module_platform_driver(). The platform_driver_register() and
platform_driver_unregister() functions called directly to keep the same
behavior. This is needed because module_platform_driver() is based on
module_driver() which can only be used once in a module.

A function optee_rpc_cmd() is factored out from the function
handle_rpc_func_cmd() to handle the ABI independent part of RPC
processing.

This patch is not supposed to change the driver behavior, it's only a
matter of reorganizing the code.

Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Jens Wiklander 2021-07-21 16:30:28 +02:00
parent 4602c5842f
commit c51a564a5b
8 changed files with 1506 additions and 1388 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/tee/optee/Makefile
View File

@ -4,8 +4,8 @@ optee-objs += core.o
optee-objs += call.o
optee-objs += rpc.o
optee-objs += supp.o
optee-objs += shm_pool.o
optee-objs += device.o
optee-objs += smc_abi.o
# for tracing framework to find optee_trace.h
CFLAGS_call.o := -I$(src)
CFLAGS_smc_abi.o := -I$(src)

369
drivers/tee/optee/call.c
View File

@ -2,28 +2,17 @@
/*
* Copyright (c) 2015-2021, Linaro Limited
*/
#include <linux/arm-smccc.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include "optee_private.h"
#include "optee_smc.h"
#define CREATE_TRACE_POINTS
#include "optee_trace.h"
struct optee_call_waiter {
struct list_head list_node;
struct completion c;
};
static void optee_cq_wait_init(struct optee_call_queue *cq,
struct optee_call_waiter *w)
void optee_cq_wait_init(struct optee_call_queue *cq,
struct optee_call_waiter *w)
{
/*
* We're preparing to make a call to secure world. In case we can't
@ -47,8 +36,8 @@ static void optee_cq_wait_init(struct optee_call_queue *cq,
mutex_unlock(&cq->mutex);
}
static void optee_cq_wait_for_completion(struct optee_call_queue *cq,
struct optee_call_waiter *w)
void optee_cq_wait_for_completion(struct optee_call_queue *cq,
struct optee_call_waiter *w)
{
wait_for_completion(&w->c);
@ -74,8 +63,8 @@ static void optee_cq_complete_one(struct optee_call_queue *cq)
}
}
static void optee_cq_wait_final(struct optee_call_queue *cq,
struct optee_call_waiter *w)
void optee_cq_wait_final(struct optee_call_queue *cq,
struct optee_call_waiter *w)
{
/*
* We're done with the call to secure world. The thread in secure
@ -115,73 +104,8 @@ static struct optee_session *find_session(struct optee_context_data *ctxdata,
return NULL;
}
/**
* optee_do_call_with_arg() - Do an SMC to OP-TEE in secure world
* @ctx: calling context
* @arg: shared memory holding the message to pass to secure world
*
* Does and SMC to OP-TEE in secure world and handles eventual resulting
* Remote Procedure Calls (RPC) from OP-TEE.
*
* Returns return code from secure world, 0 is OK
*/
int optee_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_call_waiter w;
struct optee_rpc_param param = { };
struct optee_call_ctx call_ctx = { };
phys_addr_t parg;
int rc;
rc = tee_shm_get_pa(arg, 0, &parg);
if (rc)
return rc;
param.a0 = OPTEE_SMC_CALL_WITH_ARG;
reg_pair_from_64(&param.a1, &param.a2, parg);
/* Initialize waiter */
optee_cq_wait_init(&optee->call_queue, &w);
while (true) {
struct arm_smccc_res res;
trace_optee_invoke_fn_begin(&param);
optee->invoke_fn(param.a0, param.a1, param.a2, param.a3,
param.a4, param.a5, param.a6, param.a7,
&res);
trace_optee_invoke_fn_end(&param, &res);
if (res.a0 == OPTEE_SMC_RETURN_ETHREAD_LIMIT) {
/*
* Out of threads in secure world, wait for a thread
* become available.
*/
optee_cq_wait_for_completion(&optee->call_queue, &w);
} else if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) {
cond_resched();
param.a0 = res.a0;
param.a1 = res.a1;
param.a2 = res.a2;
param.a3 = res.a3;
optee_handle_rpc(ctx, &param, &call_ctx);
} else {
rc = res.a0;
break;
}
}
optee_rpc_finalize_call(&call_ctx);
/*
* We're done with our thread in secure world, if there's any
* thread waiters wake up one.
*/
optee_cq_wait_final(&optee->call_queue, &w);
return rc;
}
static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params,
struct optee_msg_arg **msg_arg)
struct tee_shm *optee_get_msg_arg(struct tee_context *ctx, size_t num_params,
struct optee_msg_arg **msg_arg)
{
struct tee_shm *shm;
struct optee_msg_arg *ma;
@ -217,7 +141,7 @@ int optee_open_session(struct tee_context *ctx,
uuid_t client_uuid;
/* +2 for the meta parameters added below */
shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg);
shm = optee_get_msg_arg(ctx, arg->num_params + 2, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
@ -290,7 +214,7 @@ int optee_close_session_helper(struct tee_context *ctx, u32 session)
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_msg_arg *msg_arg;
shm = get_msg_arg(ctx, 0, &msg_arg);
shm = optee_get_msg_arg(ctx, 0, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
@ -338,7 +262,7 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
if (!sess)
return -EINVAL;
shm = get_msg_arg(ctx, arg->num_params, &msg_arg);
shm = optee_get_msg_arg(ctx, arg->num_params, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
@ -384,7 +308,7 @@ int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
if (!sess)
return -EINVAL;
shm = get_msg_arg(ctx, 0, &msg_arg);
shm = optee_get_msg_arg(ctx, 0, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
@ -397,182 +321,6 @@ int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
return 0;
}
/**
* optee_enable_shm_cache() - Enables caching of some shared memory allocation
* in OP-TEE
* @optee: main service struct
*/
void optee_enable_shm_cache(struct optee *optee)
{
struct optee_call_waiter w;
/* We need to retry until secure world isn't busy. */
optee_cq_wait_init(&optee->call_queue, &w);
while (true) {
struct arm_smccc_res res;
optee->invoke_fn(OPTEE_SMC_ENABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
0, &res);
if (res.a0 == OPTEE_SMC_RETURN_OK)
break;
optee_cq_wait_for_completion(&optee->call_queue, &w);
}
optee_cq_wait_final(&optee->call_queue, &w);
}
/**
* __optee_disable_shm_cache() - Disables caching of some shared memory
* allocation in OP-TEE
* @optee: main service struct
* @is_mapped: true if the cached shared memory addresses were mapped by this
* kernel, are safe to dereference, and should be freed
*/
static void __optee_disable_shm_cache(struct optee *optee, bool is_mapped)
{
struct optee_call_waiter w;
/* We need to retry until secure world isn't busy. */
optee_cq_wait_init(&optee->call_queue, &w);
while (true) {
union {
struct arm_smccc_res smccc;
struct optee_smc_disable_shm_cache_result result;
} res;
optee->invoke_fn(OPTEE_SMC_DISABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
0, &res.smccc);
if (res.result.status == OPTEE_SMC_RETURN_ENOTAVAIL)
break; /* All shm's freed */
if (res.result.status == OPTEE_SMC_RETURN_OK) {
struct tee_shm *shm;
/*
* Shared memory references that were not mapped by
* this kernel must be ignored to prevent a crash.
*/
if (!is_mapped)
continue;
shm = reg_pair_to_ptr(res.result.shm_upper32,
res.result.shm_lower32);
tee_shm_free(shm);
} else {
optee_cq_wait_for_completion(&optee->call_queue, &w);
}
}
optee_cq_wait_final(&optee->call_queue, &w);
}
/**
* optee_disable_shm_cache() - Disables caching of mapped shared memory
* allocations in OP-TEE
* @optee: main service struct
*/
void optee_disable_shm_cache(struct optee *optee)
{
return __optee_disable_shm_cache(optee, true);
}
/**
* optee_disable_unmapped_shm_cache() - Disables caching of shared memory
* allocations in OP-TEE which are not
* currently mapped
* @optee: main service struct
*/
void optee_disable_unmapped_shm_cache(struct optee *optee)
{
return __optee_disable_shm_cache(optee, false);
}
#define PAGELIST_ENTRIES_PER_PAGE \
((OPTEE_MSG_NONCONTIG_PAGE_SIZE / sizeof(u64)) - 1)
/**
* optee_fill_pages_list() - write list of user pages to given shared
* buffer.
*
* @dst: page-aligned buffer where list of pages will be stored
* @pages: array of pages that represents shared buffer
* @num_pages: number of entries in @pages
* @page_offset: offset of user buffer from page start
*
* @dst should be big enough to hold list of user page addresses and
* links to the next pages of buffer
*/
void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
size_t page_offset)
{
int n = 0;
phys_addr_t optee_page;
/*
* Refer to OPTEE_MSG_ATTR_NONCONTIG description in optee_msg.h
* for details.
*/
struct {
u64 pages_list[PAGELIST_ENTRIES_PER_PAGE];
u64 next_page_data;
} *pages_data;
/*
* Currently OP-TEE uses 4k page size and it does not looks
* like this will change in the future. On other hand, there are
* no know ARM architectures with page size < 4k.
* Thus the next built assert looks redundant. But the following
* code heavily relies on this assumption, so it is better be
* safe than sorry.
*/
BUILD_BUG_ON(PAGE_SIZE < OPTEE_MSG_NONCONTIG_PAGE_SIZE);
pages_data = (void *)dst;
/*
* If linux page is bigger than 4k, and user buffer offset is
* larger than 4k/8k/12k/etc this will skip first 4k pages,
* because they bear no value data for OP-TEE.
*/
optee_page = page_to_phys(*pages) +
round_down(page_offset, OPTEE_MSG_NONCONTIG_PAGE_SIZE);
while (true) {
pages_data->pages_list[n++] = optee_page;
if (n == PAGELIST_ENTRIES_PER_PAGE) {
pages_data->next_page_data =
virt_to_phys(pages_data + 1);
pages_data++;
n = 0;
}
optee_page += OPTEE_MSG_NONCONTIG_PAGE_SIZE;
if (!(optee_page & ~PAGE_MASK)) {
if (!--num_pages)
break;
pages++;
optee_page = page_to_phys(*pages);
}
}
}
/*
* The final entry in each pagelist page is a pointer to the next
* pagelist page.
*/
static size_t get_pages_list_size(size_t num_entries)
{
int pages = DIV_ROUND_UP(num_entries, PAGELIST_ENTRIES_PER_PAGE);
return pages * OPTEE_MSG_NONCONTIG_PAGE_SIZE;
}
u64 *optee_allocate_pages_list(size_t num_entries)
{
return alloc_pages_exact(get_pages_list_size(num_entries), GFP_KERNEL);
}
void optee_free_pages_list(void *list, size_t num_entries)
{
free_pages_exact(list, get_pages_list_size(num_entries));
}
static bool is_normal_memory(pgprot_t p)
{
#if defined(CONFIG_ARM)
@ -596,7 +344,7 @@ static int __check_mem_type(struct vm_area_struct *vma, unsigned long end)
return -EINVAL;
}
static int check_mem_type(unsigned long start, size_t num_pages)
int optee_check_mem_type(unsigned long start, size_t num_pages)
{
struct mm_struct *mm = current->mm;
int rc;
@ -615,94 +363,3 @@ static int check_mem_type(unsigned long start, size_t num_pages)
return rc;
}
int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
struct page **pages, size_t num_pages,
unsigned long start)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_msg_arg *msg_arg;
struct tee_shm *shm_arg;
u64 *pages_list;
int rc;
if (!num_pages)
return -EINVAL;
rc = check_mem_type(start, num_pages);
if (rc)
return rc;
pages_list = optee_allocate_pages_list(num_pages);
if (!pages_list)
return -ENOMEM;
shm_arg = get_msg_arg(ctx, 1, &msg_arg);
if (IS_ERR(shm_arg)) {
rc = PTR_ERR(shm_arg);
goto out;
}
optee_fill_pages_list(pages_list, pages, num_pages,
tee_shm_get_page_offset(shm));
msg_arg->cmd = OPTEE_MSG_CMD_REGISTER_SHM;
msg_arg->params->attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
OPTEE_MSG_ATTR_NONCONTIG;
msg_arg->params->u.tmem.shm_ref = (unsigned long)shm;
msg_arg->params->u.tmem.size = tee_shm_get_size(shm);
/*
* In the least bits of msg_arg->params->u.tmem.buf_ptr we
* store buffer offset from 4k page, as described in OP-TEE ABI.
*/
msg_arg->params->u.tmem.buf_ptr = virt_to_phys(pages_list) |
(tee_shm_get_page_offset(shm) & (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
if (optee->ops->do_call_with_arg(ctx, shm_arg) ||
msg_arg->ret != TEEC_SUCCESS)
rc = -EINVAL;
tee_shm_free(shm_arg);
out:
optee_free_pages_list(pages_list, num_pages);
return rc;
}
int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_msg_arg *msg_arg;
struct tee_shm *shm_arg;
int rc = 0;
shm_arg = get_msg_arg(ctx, 1, &msg_arg);
if (IS_ERR(shm_arg))
return PTR_ERR(shm_arg);
msg_arg->cmd = OPTEE_MSG_CMD_UNREGISTER_SHM;
msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
msg_arg->params[0].u.rmem.shm_ref = (unsigned long)shm;
if (optee->ops->do_call_with_arg(ctx, shm_arg) ||
msg_arg->ret != TEEC_SUCCESS)
rc = -EINVAL;
tee_shm_free(shm_arg);
return rc;
}
int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
struct page **pages, size_t num_pages,
unsigned long start)
{
/*
* We don't want to register supplicant memory in OP-TEE.
* Instead information about it will be passed in RPC code.
*/
return check_mem_type(start, num_pages);
}
int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm)
{
return 0;
}

721
drivers/tee/optee/core.c
View File

@ -1,260 +1,71 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015-2021, Linaro Limited
* Copyright (c) 2016, EPAM Systems
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/arm-smccc.h>
#include <linux/crash_dump.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tee_drv.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include <linux/workqueue.h>
#include "optee_private.h"
#include "optee_smc.h"
#include "shm_pool.h"
#define DRIVER_NAME "optee"
#define OPTEE_SHM_NUM_PRIV_PAGES CONFIG_OPTEE_SHM_NUM_PRIV_PAGES
static void from_msg_param_value(struct tee_param *p, u32 attr,
const struct optee_msg_param *mp)
int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm, size_t size,
int (*shm_register)(struct tee_context *ctx,
struct tee_shm *shm,
struct page **pages,
size_t num_pages,
unsigned long start))
{
p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
p->u.value.a = mp->u.value.a;
p->u.value.b = mp->u.value.b;
p->u.value.c = mp->u.value.c;
}
unsigned int order = get_order(size);
struct page *page;
int rc = 0;
static int from_msg_param_tmp_mem(struct tee_param *p, u32 attr,
const struct optee_msg_param *mp)
{
struct tee_shm *shm;
phys_addr_t pa;
int rc;
page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!page)
return -ENOMEM;
p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
p->u.memref.size = mp->u.tmem.size;
shm = (struct tee_shm *)(unsigned long)mp->u.tmem.shm_ref;
if (!shm) {
p->u.memref.shm_offs = 0;
p->u.memref.shm = NULL;
return 0;
}
shm->kaddr = page_address(page);
shm->paddr = page_to_phys(page);
shm->size = PAGE_SIZE << order;
rc = tee_shm_get_pa(shm, 0, &pa);
if (rc)
return rc;
if (shm_register) {
unsigned int nr_pages = 1 << order, i;
struct page **pages;
p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
p->u.memref.shm = shm;
pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
if (!pages) {
rc = -ENOMEM;
goto err;
}
/* Check that the memref is covered by the shm object */
if (p->u.memref.size) {
size_t o = p->u.memref.shm_offs +
p->u.memref.size - 1;
for (i = 0; i < nr_pages; i++) {
pages[i] = page;
page++;
}
rc = tee_shm_get_pa(shm, o, NULL);
shm->flags |= TEE_SHM_REGISTER;
rc = shm_register(shm->ctx, shm, pages, nr_pages,
(unsigned long)shm->kaddr);
kfree(pages);
if (rc)
return rc;
goto err;
}
return 0;
}
static void from_msg_param_reg_mem(struct tee_param *p, u32 attr,
const struct optee_msg_param *mp)
{
struct tee_shm *shm;
p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
p->u.memref.size = mp->u.rmem.size;
shm = (struct tee_shm *)(unsigned long)mp->u.rmem.shm_ref;
if (shm) {
p->u.memref.shm_offs = mp->u.rmem.offs;
p->u.memref.shm = shm;
} else {
p->u.memref.shm_offs = 0;
p->u.memref.shm = NULL;
}
}
/**
* optee_from_msg_param() - convert from OPTEE_MSG parameters to
* struct tee_param
* @optee: main service struct
* @params: subsystem internal parameter representation
* @num_params: number of elements in the parameter arrays
* @msg_params: OPTEE_MSG parameters
* Returns 0 on success or <0 on failure
*/
static int optee_from_msg_param(struct optee *optee, struct tee_param *params,
size_t num_params,
const struct optee_msg_param *msg_params)
{
int rc;
size_t n;
for (n = 0; n < num_params; n++) {
struct tee_param *p = params + n;
const struct optee_msg_param *mp = msg_params + n;
u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
switch (attr) {
case OPTEE_MSG_ATTR_TYPE_NONE:
p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
memset(&p->u, 0, sizeof(p->u));
break;
case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
from_msg_param_value(p, attr, mp);
break;
case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
rc = from_msg_param_tmp_mem(p, attr, mp);
if (rc)
return rc;
break;
case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
from_msg_param_reg_mem(p, attr, mp);
break;
default:
return -EINVAL;
}
}
return 0;
}
static void to_msg_param_value(struct optee_msg_param *mp,
const struct tee_param *p)
{
mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
mp->u.value.a = p->u.value.a;
mp->u.value.b = p->u.value.b;
mp->u.value.c = p->u.value.c;
}
static int to_msg_param_tmp_mem(struct optee_msg_param *mp,
const struct tee_param *p)
{
int rc;
phys_addr_t pa;
mp->attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT + p->attr -
TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
mp->u.tmem.shm_ref = (unsigned long)p->u.memref.shm;
mp->u.tmem.size = p->u.memref.size;
if (!p->u.memref.shm) {
mp->u.tmem.buf_ptr = 0;
return 0;
}
rc = tee_shm_get_pa(p->u.memref.shm, p->u.memref.shm_offs, &pa);
if (rc)
return rc;
mp->u.tmem.buf_ptr = pa;
mp->attr |= OPTEE_MSG_ATTR_CACHE_PREDEFINED <<
OPTEE_MSG_ATTR_CACHE_SHIFT;
return 0;
}
static int to_msg_param_reg_mem(struct optee_msg_param *mp,
const struct tee_param *p)
{
mp->attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT + p->attr -
TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
mp->u.rmem.shm_ref = (unsigned long)p->u.memref.shm;
mp->u.rmem.size = p->u.memref.size;
mp->u.rmem.offs = p->u.memref.shm_offs;
return 0;
}
/**
* optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
* @optee: main service struct
* @msg_params: OPTEE_MSG parameters
* @num_params: number of elements in the parameter arrays
* @params: subsystem itnernal parameter representation
* Returns 0 on success or <0 on failure
*/
static int optee_to_msg_param(struct optee *optee,
struct optee_msg_param *msg_params,
size_t num_params, const struct tee_param *params)
{
int rc;
size_t n;
for (n = 0; n < num_params; n++) {
const struct tee_param *p = params + n;
struct optee_msg_param *mp = msg_params + n;
switch (p->attr) {
case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
memset(&mp->u, 0, sizeof(mp->u));
break;
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
to_msg_param_value(mp, p);
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 (tee_shm_is_registered(p->u.memref.shm))
rc = to_msg_param_reg_mem(mp, p);
else
rc = to_msg_param_tmp_mem(mp, p);
if (rc)
return rc;
break;
default:
return -EINVAL;
}
}
return 0;
}
static void optee_get_version(struct tee_device *teedev,
struct tee_ioctl_version_data *vers)
{
struct tee_ioctl_version_data v = {
.impl_id = TEE_IMPL_ID_OPTEE,
.impl_caps = TEE_OPTEE_CAP_TZ,
.gen_caps = TEE_GEN_CAP_GP,
};
struct optee *optee = tee_get_drvdata(teedev);
if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
v.gen_caps |= TEE_GEN_CAP_REG_MEM;
if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
v.gen_caps |= TEE_GEN_CAP_MEMREF_NULL;
*vers = v;
err:
__free_pages(page, order);
return rc;
}
static void optee_bus_scan(struct work_struct *work)
@ -262,7 +73,7 @@ static void optee_bus_scan(struct work_struct *work)
WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
}
static int optee_open(struct tee_context *ctx)
int optee_open(struct tee_context *ctx, bool cap_memref_null)
{
struct optee_context_data *ctxdata;
struct tee_device *teedev = ctx->teedev;
@ -300,11 +111,7 @@ static int optee_open(struct tee_context *ctx)
mutex_init(&ctxdata->mutex);
INIT_LIST_HEAD(&ctxdata->sess_list);
if (optee->sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
ctx->cap_memref_null = true;
else
ctx->cap_memref_null = false;
ctx->cap_memref_null = cap_memref_null;
ctx->data = ctxdata;
return 0;
}
@ -330,12 +137,12 @@ static void optee_release_helper(struct tee_context *ctx,
ctx->data = NULL;
}
static void optee_release(struct tee_context *ctx)
void optee_release(struct tee_context *ctx)
{
optee_release_helper(ctx, optee_close_session_helper);
}
static void optee_release_supp(struct tee_context *ctx)
void optee_release_supp(struct tee_context *ctx)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
@ -347,287 +154,11 @@ static void optee_release_supp(struct tee_context *ctx)
optee_supp_release(&optee->supp);
}
static const struct tee_driver_ops optee_clnt_ops = {
.get_version = optee_get_version,
.open = optee_open,
.release = optee_release,
.open_session = optee_open_session,
.close_session = optee_close_session,
.invoke_func = optee_invoke_func,
.cancel_req = optee_cancel_req,
.shm_register = optee_shm_register,
.shm_unregister = optee_shm_unregister,
};
static const struct tee_desc optee_clnt_desc = {
.name = DRIVER_NAME "-clnt",
.ops = &optee_clnt_ops,
.owner = THIS_MODULE,
};
static const struct tee_driver_ops optee_supp_ops = {
.get_version = optee_get_version,
.open = optee_open,
.release = optee_release_supp,
.supp_recv = optee_supp_recv,
.supp_send = optee_supp_send,
.shm_register = optee_shm_register_supp,
.shm_unregister = optee_shm_unregister_supp,
};
static const struct tee_desc optee_supp_desc = {
.name = DRIVER_NAME "-supp",
.ops = &optee_supp_ops,
.owner = THIS_MODULE,
.flags = TEE_DESC_PRIVILEGED,
};
static const struct optee_ops optee_ops = {
.do_call_with_arg = optee_do_call_with_arg,
.to_msg_param = optee_to_msg_param,
.from_msg_param = optee_from_msg_param,
};
static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn)
void optee_remove_common(struct optee *optee)
{
struct arm_smccc_res res;
invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
if (res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3)
return true;
return false;
}
static void optee_msg_get_os_revision(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)
pr_info("revision %lu.%lu (%08lx)", res.result.major,
res.result.minor, res.result.build_id);
else
pr_info("revision %lu.%lu", res.result.major, res.result.minor);
}
static bool optee_msg_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);
if (res.result.major == OPTEE_MSG_REVISION_MAJOR &&
(int)res.result.minor >= OPTEE_MSG_REVISION_MINOR)
return true;
return false;
}
static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
u32 *sec_caps)
{
union {
struct arm_smccc_res smccc;
struct optee_smc_exchange_capabilities_result result;
} res;
u32 a1 = 0;
/*
* TODO This isn't enough to tell if it's UP system (from kernel
* point of view) or not, is_smp() returns the the information
* needed, but can't be called directly from here.
*/
if (!IS_ENABLED(CONFIG_SMP) || nr_cpu_ids == 1)
a1 |= OPTEE_SMC_NSEC_CAP_UNIPROCESSOR;
invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES, a1, 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;
}
static struct tee_shm_pool *optee_config_dyn_shm(void)
{
struct tee_shm_pool_mgr *priv_mgr;
struct tee_shm_pool_mgr *dmabuf_mgr;
void *rc;
rc = optee_shm_pool_alloc_pages();
if (IS_ERR(rc))
return rc;
priv_mgr = rc;
rc = optee_shm_pool_alloc_pages();
if (IS_ERR(rc)) {
tee_shm_pool_mgr_destroy(priv_mgr);
return rc;
}
dmabuf_mgr = rc;
rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
if (IS_ERR(rc)) {
tee_shm_pool_mgr_destroy(priv_mgr);
tee_shm_pool_mgr_destroy(dmabuf_mgr);
}
return rc;
}
static struct tee_shm_pool *
optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
{
union {
struct arm_smccc_res smccc;
struct optee_smc_get_shm_config_result result;
} res;
unsigned long vaddr;
phys_addr_t paddr;
size_t size;
phys_addr_t begin;
phys_addr_t end;
void *va;
struct tee_shm_pool_mgr *priv_mgr;
struct tee_shm_pool_mgr *dmabuf_mgr;
void *rc;
const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
if (res.result.status != OPTEE_SMC_RETURN_OK) {
pr_err("static shm service not available\n");
return ERR_PTR(-ENOENT);
}
if (res.result.settings != OPTEE_SMC_SHM_CACHED) {
pr_err("only normal cached shared memory supported\n");
return ERR_PTR(-EINVAL);
}
begin = roundup(res.result.start, PAGE_SIZE);
end = rounddown(res.result.start + res.result.size, PAGE_SIZE);
paddr = begin;
size = end - begin;
if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
pr_err("too small shared memory area\n");
return ERR_PTR(-EINVAL);
}
va = memremap(paddr, size, MEMREMAP_WB);
if (!va) {
pr_err("shared memory ioremap failed\n");
return ERR_PTR(-EINVAL);
}
vaddr = (unsigned long)va;
rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
3 /* 8 bytes aligned */);
if (IS_ERR(rc))
goto err_memunmap;
priv_mgr = rc;
vaddr += sz;
paddr += sz;
size -= sz;
rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
if (IS_ERR(rc))
goto err_free_priv_mgr;
dmabuf_mgr = rc;
rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
if (IS_ERR(rc))
goto err_free_dmabuf_mgr;
*memremaped_shm = va;
return rc;
err_free_dmabuf_mgr:
tee_shm_pool_mgr_destroy(dmabuf_mgr);
err_free_priv_mgr:
tee_shm_pool_mgr_destroy(priv_mgr);
err_memunmap:
memunmap(va);
return rc;
}
/* 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 device *dev)
{
const char *method;
pr_info("probing for conduit method.\n");
if (device_property_read_string(dev, "method", &method)) {
pr_warn("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;
pr_warn("invalid \"method\" property: %s\n", method);
return ERR_PTR(-EINVAL);
}
/* optee_remove - Device Removal Routine
* @pdev: platform device information struct
*
* optee_remove is called by platform subsystem to alert the driver
* that it should release the device
*/
static int optee_remove(struct platform_device *pdev)
{
struct optee *optee = platform_get_drvdata(pdev);
/* Unregister OP-TEE specific client devices on TEE bus */
optee_unregister_devices();
/*
* Ask OP-TEE to free all cached shared memory objects to decrease
* reference counters and also avoid wild pointers in secure world
* into the old shared memory range.
*/
optee_disable_shm_cache(optee);
/*
* The two devices have to be unregistered before we can free the
* other resources.
@ -636,39 +167,13 @@ static int optee_remove(struct platform_device *pdev)
tee_device_unregister(optee->teedev);
tee_shm_pool_free(optee->pool);
if (optee->memremaped_shm)
memunmap(optee->memremaped_shm);
optee_wait_queue_exit(&optee->wait_queue);
optee_supp_uninit(&optee->supp);
mutex_destroy(&optee->call_queue.mutex);
kfree(optee);
return 0;
}
/* optee_shutdown - Device Removal Routine
* @pdev: platform device information struct
*
* platform_shutdown is called by the platform subsystem to alert
* the driver that a shutdown, reboot, or kexec is happening and
* device must be disabled.
*/
static void optee_shutdown(struct platform_device *pdev)
static int optee_core_init(void)
{
optee_disable_shm_cache(platform_get_drvdata(pdev));
}
static int optee_probe(struct platform_device *pdev)
{
optee_invoke_fn *invoke_fn;
struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
struct optee *optee = NULL;
void *memremaped_shm = NULL;
struct tee_device *teedev;
u32 sec_caps;
int rc;
/*
* The kernel may have crashed at the same time that all available
* secure world threads were suspended and we cannot reschedule the
@ -679,139 +184,15 @@ static int optee_probe(struct platform_device *pdev)
if (is_kdump_kernel())
return -ENODEV;
invoke_fn = get_invoke_func(&pdev->dev);
if (IS_ERR(invoke_fn))
return PTR_ERR(invoke_fn);
if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
pr_warn("api uid mismatch\n");
return -EINVAL;
}
optee_msg_get_os_revision(invoke_fn);
if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
pr_warn("api revision mismatch\n");
return -EINVAL;
}
if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
pr_warn("capabilities mismatch\n");
return -EINVAL;
}
/*
* Try to use dynamic shared memory if possible
*/
if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
pool = optee_config_dyn_shm();
/*
* If dynamic shared memory is not available or failed - try static one
*/
if (IS_ERR(pool) && (sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);
if (IS_ERR(pool))
return PTR_ERR(pool);
optee = kzalloc(sizeof(*optee), GFP_KERNEL);
if (!optee) {
rc = -ENOMEM;
goto err;
}
optee->ops = &optee_ops;
optee->invoke_fn = invoke_fn;
optee->sec_caps = sec_caps;
teedev = tee_device_alloc(&optee_clnt_desc, NULL, pool, optee);
if (IS_ERR(teedev)) {
rc = PTR_ERR(teedev);
goto err;
}
optee->teedev = teedev;
teedev = tee_device_alloc(&optee_supp_desc, NULL, pool, optee);
if (IS_ERR(teedev)) {
rc = PTR_ERR(teedev);
goto err;
}
optee->supp_teedev = teedev;
rc = tee_device_register(optee->teedev);
if (rc)
goto err;
rc = tee_device_register(optee->supp_teedev);
if (rc)
goto err;
mutex_init(&optee->call_queue.mutex);
INIT_LIST_HEAD(&optee->call_queue.waiters);
optee_wait_queue_init(&optee->wait_queue);
optee_supp_init(&optee->supp);
optee->memremaped_shm = memremaped_shm;
optee->pool = pool;
/*
* Ensure that there are no pre-existing shm objects before enabling
* the shm cache so that there's no chance of receiving an invalid
* address during shutdown. This could occur, for example, if we're
* kexec booting from an older kernel that did not properly cleanup the
* shm cache.
*/
optee_disable_unmapped_shm_cache(optee);
optee_enable_shm_cache(optee);
if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
pr_info("dynamic shared memory is enabled\n");
platform_set_drvdata(pdev, optee);
rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
if (rc) {
optee_remove(pdev);
return rc;
}
pr_info("initialized driver\n");
return 0;
err:
if (optee) {
/*
* tee_device_unregister() is safe to call even if the
* devices hasn't been registered with
* tee_device_register() yet.
*/
tee_device_unregister(optee->supp_teedev);
tee_device_unregister(optee->teedev);
kfree(optee);
}
if (pool)
tee_shm_pool_free(pool);
if (memremaped_shm)
memunmap(memremaped_shm);
return rc;
return optee_smc_abi_register();
}
module_init(optee_core_init);
static const struct of_device_id optee_dt_match[] = {
{ .compatible = "linaro,optee-tz" },
{},
};
MODULE_DEVICE_TABLE(of, optee_dt_match);
static struct platform_driver optee_driver = {
.probe = optee_probe,
.remove = optee_remove,
.shutdown = optee_shutdown,
.driver = {
.name = "optee",
.of_match_table = optee_dt_match,
},
};
module_platform_driver(optee_driver);
static void optee_core_exit(void)
{
optee_smc_abi_unregister();
}
module_exit(optee_core_exit);
MODULE_AUTHOR("Linaro");
MODULE_DESCRIPTION("OP-TEE driver");

106
drivers/tee/optee/optee_private.h
View File

@ -12,6 +12,8 @@
#include <linux/types.h>
#include "optee_msg.h"
#define DRIVER_NAME "optee"
#define OPTEE_MAX_ARG_SIZE 1024
/* Some Global Platform error codes used in this driver */
@ -29,6 +31,11 @@ typedef void (optee_invoke_fn)(unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long,
struct arm_smccc_res *);
struct optee_call_waiter {
struct list_head list_node;
struct completion c;
};
struct optee_call_queue {
/* Serializes access to this struct */
struct mutex mutex;
@ -66,6 +73,19 @@ struct optee_supp {
struct completion reqs_c;
};
/**
* struct optee_smc - SMC ABI specifics
* @invoke_fn: function to issue smc or hvc
* @memremaped_shm virtual address of memory in shared memory pool
* @sec_caps: secure world capabilities defined by
* OPTEE_SMC_SEC_CAP_* in optee_smc.h
*/
struct optee_smc {
optee_invoke_fn *invoke_fn;
void *memremaped_shm;
u32 sec_caps;
};
struct optee;
/**
@ -95,15 +115,12 @@ struct optee_ops {
* @ops: internal callbacks for different ways to reach secure
* world
* @teedev: client device
* @invoke_fn: function to issue smc or hvc
* @smc: specific to SMC ABI
* @call_queue: queue of threads waiting to call @invoke_fn
* @wait_queue: queue of threads from secure world waiting for a
* secure world sync object
* @supp: supplicant synchronization struct for RPC to supplicant
* @pool: shared memory pool
* @memremaped_shm virtual address of memory in shared memory pool
* @sec_caps: secure world capabilities defined by
* OPTEE_SMC_SEC_CAP_* in optee_smc.h
* @scan_bus_done flag if device registation was already done.
* @scan_bus_wq workqueue to scan optee bus and register optee drivers
* @scan_bus_work workq to scan optee bus and register optee drivers
@ -112,13 +129,11 @@ struct optee {
struct tee_device *supp_teedev;
struct tee_device *teedev;
const struct optee_ops *ops;
optee_invoke_fn *invoke_fn;
struct optee_smc smc;
struct optee_call_queue call_queue;
struct optee_wait_queue wait_queue;
struct optee_supp supp;
struct tee_shm_pool *pool;
void *memremaped_shm;
u32 sec_caps;
bool scan_bus_done;
struct workqueue_struct *scan_bus_wq;
struct work_struct scan_bus_work;
@ -153,10 +168,6 @@ struct optee_call_ctx {
size_t num_entries;
};
void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param,
struct optee_call_ctx *call_ctx);
void optee_rpc_finalize_call(struct optee_call_ctx *call_ctx);
void optee_wait_queue_init(struct optee_wait_queue *wq);
void optee_wait_queue_exit(struct optee_wait_queue *wq);
@ -174,7 +185,6 @@ int optee_supp_recv(struct tee_context *ctx, u32 *func, u32 *num_params,
int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
struct tee_param *param);
int optee_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg);
int optee_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param);
@ -184,30 +194,60 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
struct tee_param *param);
int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
void optee_enable_shm_cache(struct optee *optee);
void optee_disable_shm_cache(struct optee *optee);
void optee_disable_unmapped_shm_cache(struct optee *optee);
int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
struct page **pages, size_t num_pages,
unsigned long start);
int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm);
int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm,
struct page **pages, size_t num_pages,
unsigned long start);
int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm);
u64 *optee_allocate_pages_list(size_t num_entries);
void optee_free_pages_list(void *array, size_t num_entries);
void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
size_t page_offset);
#define PTA_CMD_GET_DEVICES 0x0
#define PTA_CMD_GET_DEVICES_SUPP 0x1
int optee_enumerate_devices(u32 func);
void optee_unregister_devices(void);
int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm, size_t size,
int (*shm_register)(struct tee_context *ctx,
struct tee_shm *shm,
struct page **pages,
size_t num_pages,
unsigned long start));
void optee_remove_common(struct optee *optee);
int optee_open(struct tee_context *ctx, bool cap_memref_null);
void optee_release(struct tee_context *ctx);
void optee_release_supp(struct tee_context *ctx);
static inline void optee_from_msg_param_value(struct tee_param *p, u32 attr,
const struct optee_msg_param *mp)
{
p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
p->u.value.a = mp->u.value.a;
p->u.value.b = mp->u.value.b;
p->u.value.c = mp->u.value.c;
}
static inline void optee_to_msg_param_value(struct optee_msg_param *mp,
const struct tee_param *p)
{
mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
mp->u.value.a = p->u.value.a;
mp->u.value.b = p->u.value.b;
mp->u.value.c = p->u.value.c;
}
void optee_cq_wait_init(struct optee_call_queue *cq,
struct optee_call_waiter *w);
void optee_cq_wait_for_completion(struct optee_call_queue *cq,
struct optee_call_waiter *w);
void optee_cq_wait_final(struct optee_call_queue *cq,
struct optee_call_waiter *w);
int optee_check_mem_type(unsigned long start, size_t num_pages);
struct tee_shm *optee_get_msg_arg(struct tee_context *ctx, size_t num_params,
struct optee_msg_arg **msg_arg);
struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz);
void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm);
void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
struct optee_msg_arg *arg);
/*
* Small helpers
*/
@ -223,4 +263,8 @@ static inline void reg_pair_from_64(u32 *reg0, u32 *reg1, u64 val)
*reg1 = val;
}
/* Registration of the ABIs */
int optee_smc_abi_register(void);
void optee_smc_abi_unregister(void);
#endif /*OPTEE_PRIVATE_H*/

218
drivers/tee/optee/rpc.c
View File

@ -6,12 +6,10 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include "optee_private.h"
#include "optee_smc.h"
#include "optee_rpc_cmd.h"
struct wq_entry {
@ -266,7 +264,7 @@ out:
kfree(params);
}
static struct tee_shm *cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
struct tee_shm *optee_rpc_cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
{
u32 ret;
struct tee_param param;
@ -289,103 +287,7 @@ static struct tee_shm *cmd_alloc_suppl(struct tee_context *ctx, size_t sz)
return shm;
}
static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
struct optee_msg_arg *arg,
struct optee_call_ctx *call_ctx)
{
phys_addr_t pa;
struct tee_shm *shm;
size_t sz;
size_t n;
arg->ret_origin = TEEC_ORIGIN_COMMS;
if (!arg->num_params ||
arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
return;
}
for (n = 1; n < arg->num_params; n++) {
if (arg->params[n].attr != OPTEE_MSG_ATTR_TYPE_NONE) {
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
return;
}
}
sz = arg->params[0].u.value.b;
switch (arg->params[0].u.value.a) {
case OPTEE_RPC_SHM_TYPE_APPL:
shm = cmd_alloc_suppl(ctx, sz);
break;
case OPTEE_RPC_SHM_TYPE_KERNEL:
shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED | TEE_SHM_PRIV);
break;
default:
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
return;
}
if (IS_ERR(shm)) {
arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
return;
}
if (tee_shm_get_pa(shm, 0, &pa)) {
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
goto bad;
}
sz = tee_shm_get_size(shm);
if (tee_shm_is_registered(shm)) {
struct page **pages;
u64 *pages_list;
size_t page_num;
pages = tee_shm_get_pages(shm, &page_num);
if (!pages || !page_num) {
arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
goto bad;
}
pages_list = optee_allocate_pages_list(page_num);
if (!pages_list) {
arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
goto bad;
}
call_ctx->pages_list = pages_list;
call_ctx->num_entries = page_num;
arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
OPTEE_MSG_ATTR_NONCONTIG;
/*
* In the least bits of u.tmem.buf_ptr we store buffer offset
* from 4k page, as described in OP-TEE ABI.
*/
arg->params[0].u.tmem.buf_ptr = virt_to_phys(pages_list) |
(tee_shm_get_page_offset(shm) &
(OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
arg->params[0].u.tmem.size = tee_shm_get_size(shm);
arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
optee_fill_pages_list(pages_list, pages, page_num,
tee_shm_get_page_offset(shm));
} else {
arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT;
arg->params[0].u.tmem.buf_ptr = pa;
arg->params[0].u.tmem.size = sz;
arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
}
arg->ret = TEEC_SUCCESS;
return;
bad:
tee_shm_free(shm);
}
static void cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
void optee_rpc_cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
{
struct tee_param param;
@ -410,60 +312,9 @@ static void cmd_free_suppl(struct tee_context *ctx, struct tee_shm *shm)
optee_supp_thrd_req(ctx, OPTEE_RPC_CMD_SHM_FREE, 1, &param);
}
static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx,
struct optee_msg_arg *arg)
void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
struct optee_msg_arg *arg)
{
struct tee_shm *shm;
arg->ret_origin = TEEC_ORIGIN_COMMS;
if (arg->num_params != 1 ||
arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
return;
}
shm = (struct tee_shm *)(unsigned long)arg->params[0].u.value.b;
switch (arg->params[0].u.value.a) {
case OPTEE_RPC_SHM_TYPE_APPL:
cmd_free_suppl(ctx, shm);
break;
case OPTEE_RPC_SHM_TYPE_KERNEL:
tee_shm_free(shm);
break;
default:
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
}
arg->ret = TEEC_SUCCESS;
}
static void free_pages_list(struct optee_call_ctx *call_ctx)
{
if (call_ctx->pages_list) {
optee_free_pages_list(call_ctx->pages_list,
call_ctx->num_entries);
call_ctx->pages_list = NULL;
call_ctx->num_entries = 0;
}
}
void optee_rpc_finalize_call(struct optee_call_ctx *call_ctx)
{
free_pages_list(call_ctx);
}
static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
struct tee_shm *shm,
struct optee_call_ctx *call_ctx)
{
struct optee_msg_arg *arg;
arg = tee_shm_get_va(shm, 0);
if (IS_ERR(arg)) {
pr_err("%s: tee_shm_get_va %p failed\n", __func__, shm);
return;
}
switch (arg->cmd) {
case OPTEE_RPC_CMD_GET_TIME:
handle_rpc_func_cmd_get_time(arg);
@ -474,13 +325,6 @@ static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
case OPTEE_RPC_CMD_SUSPEND:
handle_rpc_func_cmd_wait(arg);
break;
case OPTEE_RPC_CMD_SHM_ALLOC:
free_pages_list(call_ctx);
handle_rpc_func_cmd_shm_alloc(ctx, arg, call_ctx);
break;
case OPTEE_RPC_CMD_SHM_FREE:
handle_rpc_func_cmd_shm_free(ctx, arg);
break;
case OPTEE_RPC_CMD_I2C_TRANSFER:
handle_rpc_func_cmd_i2c_transfer(ctx, arg);
break;
@ -489,58 +333,4 @@ static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
}
}
/**
* optee_handle_rpc() - handle RPC from secure world
* @ctx: context doing the RPC
* @param: value of registers for the RPC
* @call_ctx: call context. Preserved during one OP-TEE invocation
*
* Result of RPC is written back into @param.
*/
void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param,
struct optee_call_ctx *call_ctx)
{
struct tee_device *teedev = ctx->teedev;
struct optee *optee = tee_get_drvdata(teedev);
struct tee_shm *shm;
phys_addr_t pa;
switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
case OPTEE_SMC_RPC_FUNC_ALLOC:
shm = tee_shm_alloc(ctx, param->a1,
TEE_SHM_MAPPED | TEE_SHM_PRIV);
if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
reg_pair_from_64(&param->a1, &param->a2, pa);
reg_pair_from_64(&param->a4, &param->a5,
(unsigned long)shm);
} else {
param->a1 = 0;
param->a2 = 0;
param->a4 = 0;
param->a5 = 0;
}
break;
case OPTEE_SMC_RPC_FUNC_FREE:
shm = reg_pair_to_ptr(param->a1, param->a2);
tee_shm_free(shm);
break;
case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
/*
* A foreign interrupt was raised while secure world was
* executing, since they are handled in Linux a dummy RPC is
* performed to let Linux take the interrupt through the normal
* vector.
*/
break;
case OPTEE_SMC_RPC_FUNC_CMD:
shm = reg_pair_to_ptr(param->a1, param->a2);
handle_rpc_func_cmd(ctx, optee, shm, call_ctx);
break;
default:
pr_warn("Unknown RPC func 0x%x\n",
(u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
break;
}
param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
}

101
drivers/tee/optee/shm_pool.c
View File

@ -1,101 +0,0 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015, Linaro Limited
* Copyright (c) 2017, EPAM Systems
*/
#include <linux/device.h>
#include <linux/dma-buf.h>
#include <linux/genalloc.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include "optee_private.h"
#include "optee_smc.h"
#include "shm_pool.h"
static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm, size_t size)
{
unsigned int order = get_order(size);
struct page *page;
int rc = 0;
page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!page)
return -ENOMEM;
shm->kaddr = page_address(page);
shm->paddr = page_to_phys(page);
shm->size = PAGE_SIZE << order;
/*
* Shared memory private to the OP-TEE driver doesn't need
* to be registered with OP-TEE.
*/
if (!(shm->flags & TEE_SHM_PRIV)) {
unsigned int nr_pages = 1 << order, i;
struct page **pages;
pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
if (!pages) {
rc = -ENOMEM;
goto err;
}
for (i = 0; i < nr_pages; i++) {
pages[i] = page;
page++;
}
shm->flags |= TEE_SHM_REGISTER;
rc = optee_shm_register(shm->ctx, shm, pages, nr_pages,
(unsigned long)shm->kaddr);
kfree(pages);
if (rc)
goto err;
}
return 0;
err:
__free_pages(page, order);
return rc;
}
static void pool_op_free(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm)
{
if (!(shm->flags & TEE_SHM_PRIV))
optee_shm_unregister(shm->ctx, shm);
free_pages((unsigned long)shm->kaddr, get_order(shm->size));
shm->kaddr = NULL;
}
static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
{
kfree(poolm);
}
static const struct tee_shm_pool_mgr_ops pool_ops = {
.alloc = pool_op_alloc,
.free = pool_op_free,
.destroy_poolmgr = pool_op_destroy_poolmgr,
};
/**
* optee_shm_pool_alloc_pages() - create page-based allocator pool
*
* This pool is used when OP-TEE supports dymanic SHM. In this case
* command buffers and such are allocated from kernel's own memory.
*/
struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)
{
struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
if (!mgr)
return ERR_PTR(-ENOMEM);
mgr->ops = &pool_ops;
return mgr;
}

14
drivers/tee/optee/shm_pool.h
View File

@ -1,14 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2015, Linaro Limited
* Copyright (c) 2016, EPAM Systems
*/
#ifndef SHM_POOL_H
#define SHM_POOL_H
#include <linux/tee_drv.h>
struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void);
#endif

1361
drivers/tee/optee/smc_abi.c Normal file
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