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Merge tag 'optee-ffa-for-v5.16' of git://git.linaro.org/people/jens.wiklander/linux-tee into arm/drivers

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Add FF-A support in OP-TEE driver

Adds supports for the OP-TEE driver to communicate with secure world
using FF-A [1] as transport.

[1] https://developer.arm.com/documentation/den0077/latest

* tag 'optee-ffa-for-v5.16' of git://git.linaro.org/people/jens.wiklander/linux-tee:
  optee: add FF-A support
  optee: isolate smc abi
  optee: refactor driver with internal callbacks
  optee: simplify optee_release()
  tee: add sec_world_id to struct tee_shm
  tee: optee: Fix missing devices unregister during optee_remove
  tee/optee/shm_pool: fix application of sizeof to pointer

Link: https://lore.kernel.org/r/20211018121324.GA2943530@jade
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
2021-10-20 17:46:57 +02:00
parent 9645ccc7bd 4615e5a34b
commit 20f6d9586e
13 changed files with 2761 additions and 1416 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/tee/optee/Makefile
View File

@@ -4,8 +4,9 @@ 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
optee-objs += ffa_abi.o
# for tracing framework to find optee_trace.h
CFLAGS_call.o := -I$(src)
CFLAGS_smc_abi.o := -I$(src)

447
drivers/tee/optee/call.c
View File

@@ -1,29 +1,18 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015, Linaro Limited
* 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
@@ -115,97 +104,35 @@ 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
* @parg: physical address of 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
*/
u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg)
struct tee_shm *optee_get_msg_arg(struct tee_context *ctx, size_t num_params,
struct optee_msg_arg **msg_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 = { };
u32 ret;
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 {
ret = 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 ret;
}
static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params,
struct optee_msg_arg **msg_arg,
phys_addr_t *msg_parg)
{
int rc;
size_t sz = OPTEE_MSG_GET_ARG_SIZE(num_params);
struct tee_shm *shm;
struct optee_msg_arg *ma;
shm = tee_shm_alloc(ctx, OPTEE_MSG_GET_ARG_SIZE(num_params),
TEE_SHM_MAPPED | TEE_SHM_PRIV);
/*
* rpc_arg_count is set to the number of allocated parameters in
* the RPC argument struct if a second MSG arg struct is expected.
* The second arg struct will then be used for RPC.
*/
if (optee->rpc_arg_count)
sz += OPTEE_MSG_GET_ARG_SIZE(optee->rpc_arg_count);
shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED | TEE_SHM_PRIV);
if (IS_ERR(shm))
return shm;
ma = tee_shm_get_va(shm, 0);
if (IS_ERR(ma)) {
rc = PTR_ERR(ma);
goto out;
tee_shm_free(shm);
return (void *)ma;
}
rc = tee_shm_get_pa(shm, 0, msg_parg);
if (rc)
goto out;
memset(ma, 0, OPTEE_MSG_GET_ARG_SIZE(num_params));
ma->num_params = num_params;
*msg_arg = ma;
out:
if (rc) {
tee_shm_free(shm);
return ERR_PTR(rc);
}
return shm;
}
@@ -214,16 +141,16 @@ int optee_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_context_data *ctxdata = ctx->data;
int rc;
struct tee_shm *shm;
struct optee_msg_arg *msg_arg;
phys_addr_t msg_parg;
struct optee_session *sess = NULL;
uuid_t client_uuid;
/* +2 for the meta parameters added below */
shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg, &msg_parg);
shm = optee_get_msg_arg(ctx, arg->num_params + 2, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
@@ -247,7 +174,8 @@ int optee_open_session(struct tee_context *ctx,
goto out;
export_uuid(msg_arg->params[1].u.octets, &client_uuid);
rc = optee_to_msg_param(msg_arg->params + 2, arg->num_params, param);
rc = optee->ops->to_msg_param(optee, msg_arg->params + 2,
arg->num_params, param);
if (rc)
goto out;
@@ -257,7 +185,7 @@ int optee_open_session(struct tee_context *ctx,
goto out;
}
if (optee_do_call_with_arg(ctx, msg_parg)) {
if (optee->ops->do_call_with_arg(ctx, shm)) {
msg_arg->ret = TEEC_ERROR_COMMUNICATION;
msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
}
@@ -272,7 +200,8 @@ int optee_open_session(struct tee_context *ctx,
kfree(sess);
}
if (optee_from_msg_param(param, arg->num_params, msg_arg->params + 2)) {
if (optee->ops->from_msg_param(optee, param, arg->num_params,
msg_arg->params + 2)) {
arg->ret = TEEC_ERROR_COMMUNICATION;
arg->ret_origin = TEEC_ORIGIN_COMMS;
/* Close session again to avoid leakage */
@@ -288,12 +217,28 @@ int optee_open_session(struct tee_context *ctx,
return rc;
}
int optee_close_session_helper(struct tee_context *ctx, u32 session)
{
struct tee_shm *shm;
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_msg_arg *msg_arg;
shm = optee_get_msg_arg(ctx, 0, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
msg_arg->session = session;
optee->ops->do_call_with_arg(ctx, shm);
tee_shm_free(shm);
return 0;
}
int optee_close_session(struct tee_context *ctx, u32 session)
{
struct optee_context_data *ctxdata = ctx->data;
struct tee_shm *shm;
struct optee_msg_arg *msg_arg;
phys_addr_t msg_parg;
struct optee_session *sess;
/* Check that the session is valid and remove it from the list */
@@ -306,25 +251,16 @@ int optee_close_session(struct tee_context *ctx, u32 session)
return -EINVAL;
kfree(sess);
shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
if (IS_ERR(shm))
return PTR_ERR(shm);
msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
msg_arg->session = session;
optee_do_call_with_arg(ctx, msg_parg);
tee_shm_free(shm);
return 0;
return optee_close_session_helper(ctx, session);
}
int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
struct tee_param *param)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_context_data *ctxdata = ctx->data;
struct tee_shm *shm;
struct optee_msg_arg *msg_arg;
phys_addr_t msg_parg;
struct optee_session *sess;
int rc;
@@ -335,7 +271,7 @@ 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, &msg_parg);
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;
@@ -343,16 +279,18 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
msg_arg->session = arg->session;
msg_arg->cancel_id = arg->cancel_id;
rc = optee_to_msg_param(msg_arg->params, arg->num_params, param);
rc = optee->ops->to_msg_param(optee, msg_arg->params, arg->num_params,
param);
if (rc)
goto out;
if (optee_do_call_with_arg(ctx, msg_parg)) {
if (optee->ops->do_call_with_arg(ctx, shm)) {
msg_arg->ret = TEEC_ERROR_COMMUNICATION;
msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
}
if (optee_from_msg_param(param, arg->num_params, msg_arg->params)) {
if (optee->ops->from_msg_param(optee, param, arg->num_params,
msg_arg->params)) {
msg_arg->ret = TEEC_ERROR_COMMUNICATION;
msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
}
@@ -366,10 +304,10 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct optee_context_data *ctxdata = ctx->data;
struct tee_shm *shm;
struct optee_msg_arg *msg_arg;
phys_addr_t msg_parg;
struct optee_session *sess;
/* Check that the session is valid */
@@ -379,195 +317,19 @@ 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, &msg_parg);
shm = optee_get_msg_arg(ctx, 0, &msg_arg);
if (IS_ERR(shm))
return PTR_ERR(shm);
msg_arg->cmd = OPTEE_MSG_CMD_CANCEL;
msg_arg->session = session;
msg_arg->cancel_id = cancel_id;
optee_do_call_with_arg(ctx, msg_parg);
optee->ops->do_call_with_arg(ctx, shm);
tee_shm_free(shm);
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)
@@ -591,7 +353,7 @@ 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;
@@ -610,94 +372,3 @@ 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 tee_shm *shm_arg = NULL;
struct optee_msg_arg *msg_arg;
u64 *pages_list;
phys_addr_t msg_parg;
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, &msg_parg);
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_do_call_with_arg(ctx, msg_parg) ||
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 tee_shm *shm_arg;
struct optee_msg_arg *msg_arg;
phys_addr_t msg_parg;
int rc = 0;
shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg);
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_do_call_with_arg(ctx, msg_parg) ||
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;
}

732
drivers/tee/optee/core.c
View File

@@ -1,215 +1,71 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015, Linaro Limited
* 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
/**
* optee_from_msg_param() - convert from OPTEE_MSG parameters to
* struct tee_param
* @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
*/
int optee_from_msg_param(struct tee_param *params, size_t num_params,
const struct optee_msg_param *msg_params)
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))
{
int rc;
size_t n;
struct tee_shm *shm;
phys_addr_t pa;
unsigned int order = get_order(size);
struct page *page;
int rc = 0;
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;
page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!page)
return -ENOMEM;
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:
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;
break;
case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
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;
break;
}
rc = tee_shm_get_pa(shm, 0, &pa);
if (rc)
return rc;
p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
p->u.memref.shm = shm;
break;
case OPTEE_MSG_ATTR_TYPE_RMEM_INPUT:
case OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_RMEM_INOUT:
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;
shm->kaddr = page_address(page);
shm->paddr = page_to_phys(page);
shm->size = PAGE_SIZE << order;
if (!shm) {
p->u.memref.shm_offs = 0;
p->u.memref.shm = NULL;
break;
}
p->u.memref.shm_offs = mp->u.rmem.offs;
p->u.memref.shm = shm;
if (shm_register) {
unsigned int nr_pages = 1 << order, i;
struct page **pages;
break;
default:
return -EINVAL;
pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
if (!pages) {
rc = -ENOMEM;
goto err;
}
}
return 0;
}
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
* @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
*/
int optee_to_msg_param(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:
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;
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;
for (i = 0; i < nr_pages; i++) {
pages[i] = page;
page++;
}
shm->flags |= TEE_SHM_REGISTER;
rc = shm_register(shm->ctx, shm, pages, nr_pages,
(unsigned long)shm->kaddr);
kfree(pages);
if (rc)
goto err;
}
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)
@@ -217,7 +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;
@@ -255,342 +111,53 @@ 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;
}
static void optee_release(struct tee_context *ctx)
static void optee_release_helper(struct tee_context *ctx,
int (*close_session)(struct tee_context *ctx,
u32 session))
{
struct optee_context_data *ctxdata = ctx->data;
struct tee_device *teedev = ctx->teedev;
struct optee *optee = tee_get_drvdata(teedev);
struct tee_shm *shm;
struct optee_msg_arg *arg = NULL;
phys_addr_t parg;
struct optee_session *sess;
struct optee_session *sess_tmp;
if (!ctxdata)
return;
shm = tee_shm_alloc(ctx, sizeof(struct optee_msg_arg),
TEE_SHM_MAPPED | TEE_SHM_PRIV);
if (!IS_ERR(shm)) {
arg = tee_shm_get_va(shm, 0);
/*
* If va2pa fails for some reason, we can't call into
* secure world, only free the memory. Secure OS will leak
* sessions and finally refuse more sessions, but we will
* at least let normal world reclaim its memory.
*/
if (!IS_ERR(arg))
if (tee_shm_va2pa(shm, arg, &parg))
arg = NULL; /* prevent usage of parg below */
}
list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
list_node) {
list_del(&sess->list_node);
if (!IS_ERR_OR_NULL(arg)) {
memset(arg, 0, sizeof(*arg));
arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
arg->session = sess->session_id;
optee_do_call_with_arg(ctx, parg);
}
close_session(ctx, sess->session_id);
kfree(sess);
}
kfree(ctxdata);
if (!IS_ERR(shm))
tee_shm_free(shm);
ctx->data = NULL;
}
if (teedev == optee->supp_teedev) {
if (optee->scan_bus_wq) {
destroy_workqueue(optee->scan_bus_wq);
optee->scan_bus_wq = NULL;
}
optee_supp_release(&optee->supp);
void optee_release(struct tee_context *ctx)
{
optee_release_helper(ctx, optee_close_session_helper);
}
void optee_release_supp(struct tee_context *ctx)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
optee_release_helper(ctx, optee_close_session_helper);
if (optee->scan_bus_wq) {
destroy_workqueue(optee->scan_bus_wq);
optee->scan_bus_wq = NULL;
}
optee_supp_release(&optee->supp);
}
static const struct tee_driver_ops optee_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_desc = {
.name = DRIVER_NAME "-clnt",
.ops = &optee_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_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 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);
/*
* 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);
/* Unregister OP-TEE specific client devices on TEE bus */
optee_unregister_devices();
/*
* The two devices have to be unregistered before we can free the
@@ -600,39 +167,16 @@ 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)
{
optee_disable_shm_cache(platform_get_drvdata(pdev));
}
static int smc_abi_rc;
static int ffa_abi_rc;
static int optee_probe(struct platform_device *pdev)
static int optee_core_init(void)
{
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
@@ -643,138 +187,24 @@ 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);
smc_abi_rc = optee_smc_abi_register();
ffa_abi_rc = optee_ffa_abi_register();
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->invoke_fn = invoke_fn;
optee->sec_caps = sec_caps;
teedev = tee_device_alloc(&optee_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");
/* If both failed there's no point with this module */
if (smc_abi_rc && ffa_abi_rc)
return smc_abi_rc;
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;
}
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)
{
if (!smc_abi_rc)
optee_smc_abi_unregister();
if (!ffa_abi_rc)
optee_ffa_abi_unregister();
}
module_exit(optee_core_exit);
MODULE_AUTHOR("Linaro");
MODULE_DESCRIPTION("OP-TEE driver");

22
drivers/tee/optee/device.c
View File

@@ -53,6 +53,13 @@ static int get_devices(struct tee_context *ctx, u32 session,
return 0;
}
static void optee_release_device(struct device *dev)
{
struct tee_client_device *optee_device = to_tee_client_device(dev);
kfree(optee_device);
}
static int optee_register_device(const uuid_t *device_uuid)
{
struct tee_client_device *optee_device = NULL;
@@ -63,6 +70,7 @@ static int optee_register_device(const uuid_t *device_uuid)
return -ENOMEM;
optee_device->dev.bus = &tee_bus_type;
optee_device->dev.release = optee_release_device;
if (dev_set_name(&optee_device->dev, "optee-ta-%pUb", device_uuid)) {
kfree(optee_device);
return -ENOMEM;
@@ -154,3 +162,17 @@ int optee_enumerate_devices(u32 func)
{
return __optee_enumerate_devices(func);
}
static int __optee_unregister_device(struct device *dev, void *data)
{
if (!strncmp(dev_name(dev), "optee-ta", strlen("optee-ta")))
device_unregister(dev);
return 0;
}
void optee_unregister_devices(void)
{
bus_for_each_dev(&tee_bus_type, NULL, NULL,
__optee_unregister_device);
}

911
drivers/tee/optee/ffa_abi.c Normal file
View File

@@ -0,0 +1,911 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021, Linaro Limited
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/arm_ffa.h>
#include <linux/errno.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tee_drv.h>
#include <linux/types.h>
#include "optee_private.h"
#include "optee_ffa.h"
#include "optee_rpc_cmd.h"
/*
* This file implement the FF-A ABI used when communicating with secure world
* OP-TEE OS via FF-A.
* This file is divided into the following sections:
* 1. Maintain a hash table for lookup of a global FF-A memory handle
* 2. Convert between struct tee_param and struct optee_msg_param
* 3. Low level support functions to register shared memory in secure world
* 4. Dynamic shared memory pool based on alloc_pages()
* 5. Do a normal scheduled call into secure world
* 6. Driver initialization.
*/
/*
* 1. Maintain a hash table for lookup of a global FF-A memory handle
*
* FF-A assigns a global memory handle for each piece shared memory.
* This handle is then used when communicating with secure world.
*
* Main functions are optee_shm_add_ffa_handle() and optee_shm_rem_ffa_handle()
*/
struct shm_rhash {
struct tee_shm *shm;
u64 global_id;
struct rhash_head linkage;
};
static void rh_free_fn(void *ptr, void *arg)
{
kfree(ptr);
}
static const struct rhashtable_params shm_rhash_params = {
.head_offset = offsetof(struct shm_rhash, linkage),
.key_len = sizeof(u64),
.key_offset = offsetof(struct shm_rhash, global_id),
.automatic_shrinking = true,
};
static struct tee_shm *optee_shm_from_ffa_handle(struct optee *optee,
u64 global_id)
{
struct tee_shm *shm = NULL;
struct shm_rhash *r;
mutex_lock(&optee->ffa.mutex);
r = rhashtable_lookup_fast(&optee->ffa.global_ids, &global_id,
shm_rhash_params);
if (r)
shm = r->shm;
mutex_unlock(&optee->ffa.mutex);
return shm;
}
static int optee_shm_add_ffa_handle(struct optee *optee, struct tee_shm *shm,
u64 global_id)
{
struct shm_rhash *r;
int rc;
r = kmalloc(sizeof(*r), GFP_KERNEL);
if (!r)
return -ENOMEM;
r->shm = shm;
r->global_id = global_id;
mutex_lock(&optee->ffa.mutex);
rc = rhashtable_lookup_insert_fast(&optee->ffa.global_ids, &r->linkage,
shm_rhash_params);
mutex_unlock(&optee->ffa.mutex);
if (rc)
kfree(r);
return rc;
}
static int optee_shm_rem_ffa_handle(struct optee *optee, u64 global_id)
{
struct shm_rhash *r;
int rc = -ENOENT;
mutex_lock(&optee->ffa.mutex);
r = rhashtable_lookup_fast(&optee->ffa.global_ids, &global_id,
shm_rhash_params);
if (r)
rc = rhashtable_remove_fast(&optee->ffa.global_ids,
&r->linkage, shm_rhash_params);
mutex_unlock(&optee->ffa.mutex);
if (!rc)
kfree(r);
return rc;
}
/*
* 2. Convert between struct tee_param and struct optee_msg_param
*
* optee_ffa_from_msg_param() and optee_ffa_to_msg_param() are the main
* functions.
*/
static void from_msg_param_ffa_mem(struct optee *optee, struct tee_param *p,
u32 attr, const struct optee_msg_param *mp)
{
struct tee_shm *shm = NULL;
u64 offs_high = 0;
u64 offs_low = 0;
p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
attr - OPTEE_MSG_ATTR_TYPE_FMEM_INPUT;
p->u.memref.size = mp->u.fmem.size;
if (mp->u.fmem.global_id != OPTEE_MSG_FMEM_INVALID_GLOBAL_ID)
shm = optee_shm_from_ffa_handle(optee, mp->u.fmem.global_id);
p->u.memref.shm = shm;
if (shm) {
offs_low = mp->u.fmem.offs_low;
offs_high = mp->u.fmem.offs_high;
}
p->u.memref.shm_offs = offs_low | offs_high << 32;
}
/**
* optee_ffa_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_ffa_from_msg_param(struct optee *optee,
struct tee_param *params, size_t num_params,
const struct optee_msg_param *msg_params)
{
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:
optee_from_msg_param_value(p, attr, mp);
break;
case OPTEE_MSG_ATTR_TYPE_FMEM_INPUT:
case OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT:
case OPTEE_MSG_ATTR_TYPE_FMEM_INOUT:
from_msg_param_ffa_mem(optee, p, attr, mp);
break;
default:
return -EINVAL;
}
}
return 0;
}
static int to_msg_param_ffa_mem(struct optee_msg_param *mp,
const struct tee_param *p)
{
struct tee_shm *shm = p->u.memref.shm;
mp->attr = OPTEE_MSG_ATTR_TYPE_FMEM_INPUT + p->attr -
TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
if (shm) {
u64 shm_offs = p->u.memref.shm_offs;
mp->u.fmem.internal_offs = shm->offset;
mp->u.fmem.offs_low = shm_offs;
mp->u.fmem.offs_high = shm_offs >> 32;
/* Check that the entire offset could be stored. */
if (mp->u.fmem.offs_high != shm_offs >> 32)
return -EINVAL;
mp->u.fmem.global_id = shm->sec_world_id;
} else {
memset(&mp->u, 0, sizeof(mp->u));
mp->u.fmem.global_id = OPTEE_MSG_FMEM_INVALID_GLOBAL_ID;
}
mp->u.fmem.size = p->u.memref.size;
return 0;
}
/**
* optee_ffa_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_ffa_to_msg_param(struct optee *optee,
struct optee_msg_param *msg_params,
size_t num_params,
const struct tee_param *params)
{
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:
optee_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 (to_msg_param_ffa_mem(mp, p))
return -EINVAL;
break;
default:
return -EINVAL;
}
}
return 0;
}
/*
* 3. Low level support functions to register shared memory in secure world
*
* Functions to register and unregister shared memory both for normal
* clients and for tee-supplicant.
*/
static int optee_ffa_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);
const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
struct ffa_mem_region_attributes mem_attr = {
.receiver = ffa_dev->vm_id,
.attrs = FFA_MEM_RW,
};
struct ffa_mem_ops_args args = {
.use_txbuf = true,
.attrs = &mem_attr,
.nattrs = 1,
};
struct sg_table sgt;
int rc;
rc = optee_check_mem_type(start, num_pages);
if (rc)
return rc;
rc = sg_alloc_table_from_pages(&sgt, pages, num_pages, 0,
num_pages * PAGE_SIZE, GFP_KERNEL);
if (rc)
return rc;
args.sg = sgt.sgl;
rc = ffa_ops->memory_share(ffa_dev, &args);
sg_free_table(&sgt);
if (rc)
return rc;
rc = optee_shm_add_ffa_handle(optee, shm, args.g_handle);
if (rc) {
ffa_ops->memory_reclaim(args.g_handle, 0);
return rc;
}
shm->sec_world_id = args.g_handle;
return 0;
}
static int optee_ffa_shm_unregister(struct tee_context *ctx,
struct tee_shm *shm)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
u64 global_handle = shm->sec_world_id;
struct ffa_send_direct_data data = {
.data0 = OPTEE_FFA_UNREGISTER_SHM,
.data1 = (u32)global_handle,
.data2 = (u32)(global_handle >> 32)
};
int rc;
optee_shm_rem_ffa_handle(optee, global_handle);
shm->sec_world_id = 0;
rc = ffa_ops->sync_send_receive(ffa_dev, &data);
if (rc)
pr_err("Unregister SHM id 0x%llx rc %d\n", global_handle, rc);
rc = ffa_ops->memory_reclaim(global_handle, 0);
if (rc)
pr_err("mem_reclain: 0x%llx %d", global_handle, rc);
return rc;
}
static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
struct tee_shm *shm)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
u64 global_handle = shm->sec_world_id;
int rc;
/*
* We're skipping the OPTEE_FFA_YIELDING_CALL_UNREGISTER_SHM call
* since this is OP-TEE freeing via RPC so it has already retired
* this ID.
*/
optee_shm_rem_ffa_handle(optee, global_handle);
rc = ffa_ops->memory_reclaim(global_handle, 0);
if (rc)
pr_err("mem_reclain: 0x%llx %d", global_handle, rc);
shm->sec_world_id = 0;
return rc;
}
/*
* 4. Dynamic shared memory pool based on alloc_pages()
*
* Implements an OP-TEE specific shared memory pool.
* The main function is optee_ffa_shm_pool_alloc_pages().
*/
static int pool_ffa_op_alloc(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm, size_t size)
{
return optee_pool_op_alloc_helper(poolm, shm, size,
optee_ffa_shm_register);
}
static void pool_ffa_op_free(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm)
{
optee_ffa_shm_unregister(shm->ctx, shm);
free_pages((unsigned long)shm->kaddr, get_order(shm->size));
shm->kaddr = NULL;
}
static void pool_ffa_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
{
kfree(poolm);
}
static const struct tee_shm_pool_mgr_ops pool_ffa_ops = {
.alloc = pool_ffa_op_alloc,
.free = pool_ffa_op_free,
.destroy_poolmgr = pool_ffa_op_destroy_poolmgr,
};
/**
* optee_ffa_shm_pool_alloc_pages() - create page-based allocator pool
*
* This pool is used with OP-TEE over FF-A. In this case command buffers
* and such are allocated from kernel's own memory.
*/
static struct tee_shm_pool_mgr *optee_ffa_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_ffa_ops;
return mgr;
}
/*
* 5. Do a normal scheduled call into secure world
*
* The function optee_ffa_do_call_with_arg() performs a normal scheduled
* call into secure world. During this call may normal world request help
* from normal world using RPCs, Remote Procedure Calls. This includes
* delivery of non-secure interrupts to for instance allow rescheduling of
* the current task.
*/
static void handle_ffa_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
struct optee_msg_arg *arg)
{
struct tee_shm *shm;
if (arg->num_params != 1 ||
arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) {
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
return;
}
switch (arg->params[0].u.value.a) {
case OPTEE_RPC_SHM_TYPE_APPL:
shm = optee_rpc_cmd_alloc_suppl(ctx, arg->params[0].u.value.b);
break;
case OPTEE_RPC_SHM_TYPE_KERNEL:
shm = tee_shm_alloc(ctx, arg->params[0].u.value.b,
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;
}
arg->params[0] = (struct optee_msg_param){
.attr = OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT,
.u.fmem.size = tee_shm_get_size(shm),
.u.fmem.global_id = shm->sec_world_id,
.u.fmem.internal_offs = shm->offset,
};
arg->ret = TEEC_SUCCESS;
}
static void handle_ffa_rpc_func_cmd_shm_free(struct tee_context *ctx,
struct optee *optee,
struct optee_msg_arg *arg)
{
struct tee_shm *shm;
if (arg->num_params != 1 ||
arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT)
goto err_bad_param;
shm = optee_shm_from_ffa_handle(optee, arg->params[0].u.value.b);
if (!shm)
goto err_bad_param;
switch (arg->params[0].u.value.a) {
case OPTEE_RPC_SHM_TYPE_APPL:
optee_rpc_cmd_free_suppl(ctx, shm);
break;
case OPTEE_RPC_SHM_TYPE_KERNEL:
tee_shm_free(shm);
break;
default:
goto err_bad_param;
}
arg->ret = TEEC_SUCCESS;
return;
err_bad_param:
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
}
static void handle_ffa_rpc_func_cmd(struct tee_context *ctx,
struct optee_msg_arg *arg)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
arg->ret_origin = TEEC_ORIGIN_COMMS;
switch (arg->cmd) {
case OPTEE_RPC_CMD_SHM_ALLOC:
handle_ffa_rpc_func_cmd_shm_alloc(ctx, arg);
break;
case OPTEE_RPC_CMD_SHM_FREE:
handle_ffa_rpc_func_cmd_shm_free(ctx, optee, arg);
break;
default:
optee_rpc_cmd(ctx, optee, arg);
}
}
static void optee_handle_ffa_rpc(struct tee_context *ctx, u32 cmd,
struct optee_msg_arg *arg)
{
switch (cmd) {
case OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD:
handle_ffa_rpc_func_cmd(ctx, arg);
break;
case OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT:
/* Interrupt delivered by now */
break;
default:
pr_warn("Unknown RPC func 0x%x\n", cmd);
break;
}
}
static int optee_ffa_yielding_call(struct tee_context *ctx,
struct ffa_send_direct_data *data,
struct optee_msg_arg *rpc_arg)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops;
struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
struct optee_call_waiter w;
u32 cmd = data->data0;
u32 w4 = data->data1;
u32 w5 = data->data2;
u32 w6 = data->data3;
int rc;
/* Initialize waiter */
optee_cq_wait_init(&optee->call_queue, &w);
while (true) {
rc = ffa_ops->sync_send_receive(ffa_dev, data);
if (rc)
goto done;
switch ((int)data->data0) {
case TEEC_SUCCESS:
break;
case TEEC_ERROR_BUSY:
if (cmd == OPTEE_FFA_YIELDING_CALL_RESUME) {
rc = -EIO;
goto done;
}
/*
* Out of threads in secure world, wait for a thread
* become available.
*/
optee_cq_wait_for_completion(&optee->call_queue, &w);
data->data0 = cmd;
data->data1 = w4;
data->data2 = w5;
data->data3 = w6;
continue;
default:
rc = -EIO;
goto done;
}
if (data->data1 == OPTEE_FFA_YIELDING_CALL_RETURN_DONE)
goto done;
/*
* OP-TEE has returned with a RPC request.
*
* Note that data->data4 (passed in register w7) is already
* filled in by ffa_ops->sync_send_receive() returning
* above.
*/
cond_resched();
optee_handle_ffa_rpc(ctx, data->data1, rpc_arg);
cmd = OPTEE_FFA_YIELDING_CALL_RESUME;
data->data0 = cmd;
data->data1 = 0;
data->data2 = 0;
data->data3 = 0;
}
done:
/*
* 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;
}
/**
* optee_ffa_do_call_with_arg() - Do a FF-A call to enter OP-TEE in secure world
* @ctx: calling context
* @shm: shared memory holding the message to pass to secure world
*
* Does a FF-A call to OP-TEE in secure world and handles eventual resulting
* Remote Procedure Calls (RPC) from OP-TEE.
*
* Returns return code from FF-A, 0 is OK
*/
static int optee_ffa_do_call_with_arg(struct tee_context *ctx,
struct tee_shm *shm)
{
struct ffa_send_direct_data data = {
.data0 = OPTEE_FFA_YIELDING_CALL_WITH_ARG,
.data1 = (u32)shm->sec_world_id,
.data2 = (u32)(shm->sec_world_id >> 32),
.data3 = shm->offset,
};
struct optee_msg_arg *arg = tee_shm_get_va(shm, 0);
unsigned int rpc_arg_offs = OPTEE_MSG_GET_ARG_SIZE(arg->num_params);
struct optee_msg_arg *rpc_arg = tee_shm_get_va(shm, rpc_arg_offs);
return optee_ffa_yielding_call(ctx, &data, rpc_arg);
}
/*
* 6. Driver initialization
*
* During driver inititialization is the OP-TEE Secure Partition is probed
* to find out which features it supports so the driver can be initialized
* with a matching configuration.
*/
static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
const struct ffa_dev_ops *ops)
{
struct ffa_send_direct_data data = { OPTEE_FFA_GET_API_VERSION };
int rc;
ops->mode_32bit_set(ffa_dev);
rc = ops->sync_send_receive(ffa_dev, &data);
if (rc) {
pr_err("Unexpected error %d\n", rc);
return false;
}
if (data.data0 != OPTEE_FFA_VERSION_MAJOR ||
data.data1 < OPTEE_FFA_VERSION_MINOR) {
pr_err("Incompatible OP-TEE API version %lu.%lu",
data.data0, data.data1);
return false;
}
data = (struct ffa_send_direct_data){ OPTEE_FFA_GET_OS_VERSION };
rc = ops->sync_send_receive(ffa_dev, &data);
if (rc) {
pr_err("Unexpected error %d\n", rc);
return false;
}
if (data.data2)
pr_info("revision %lu.%lu (%08lx)",
data.data0, data.data1, data.data2);
else
pr_info("revision %lu.%lu", data.data0, data.data1);
return true;
}
static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev,
const struct ffa_dev_ops *ops,
unsigned int *rpc_arg_count)
{
struct ffa_send_direct_data data = { OPTEE_FFA_EXCHANGE_CAPABILITIES };
int rc;
rc = ops->sync_send_receive(ffa_dev, &data);
if (rc) {
pr_err("Unexpected error %d", rc);
return false;
}
if (data.data0) {
pr_err("Unexpected exchange error %lu", data.data0);
return false;
}
*rpc_arg_count = (u8)data.data1;
return true;
}
static struct tee_shm_pool *optee_ffa_config_dyn_shm(void)
{
struct tee_shm_pool_mgr *priv_mgr;
struct tee_shm_pool_mgr *dmabuf_mgr;
void *rc;
rc = optee_ffa_shm_pool_alloc_pages();
if (IS_ERR(rc))
return rc;
priv_mgr = rc;
rc = optee_ffa_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 void optee_ffa_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 | TEE_GEN_CAP_REG_MEM |
TEE_GEN_CAP_MEMREF_NULL,
};
*vers = v;
}
static int optee_ffa_open(struct tee_context *ctx)
{
return optee_open(ctx, true);
}
static const struct tee_driver_ops optee_ffa_clnt_ops = {
.get_version = optee_ffa_get_version,
.open = optee_ffa_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_ffa_shm_register,
.shm_unregister = optee_ffa_shm_unregister,
};
static const struct tee_desc optee_ffa_clnt_desc = {
.name = DRIVER_NAME "-ffa-clnt",
.ops = &optee_ffa_clnt_ops,
.owner = THIS_MODULE,
};
static const struct tee_driver_ops optee_ffa_supp_ops = {
.get_version = optee_ffa_get_version,
.open = optee_ffa_open,
.release = optee_release_supp,
.supp_recv = optee_supp_recv,
.supp_send = optee_supp_send,
.shm_register = optee_ffa_shm_register, /* same as for clnt ops */
.shm_unregister = optee_ffa_shm_unregister_supp,
};
static const struct tee_desc optee_ffa_supp_desc = {
.name = DRIVER_NAME "-ffa-supp",
.ops = &optee_ffa_supp_ops,
.owner = THIS_MODULE,
.flags = TEE_DESC_PRIVILEGED,
};
static const struct optee_ops optee_ffa_ops = {
.do_call_with_arg = optee_ffa_do_call_with_arg,
.to_msg_param = optee_ffa_to_msg_param,
.from_msg_param = optee_ffa_from_msg_param,
};
static void optee_ffa_remove(struct ffa_device *ffa_dev)
{
struct optee *optee = ffa_dev->dev.driver_data;
optee_remove_common(optee);
mutex_destroy(&optee->ffa.mutex);
rhashtable_free_and_destroy(&optee->ffa.global_ids, rh_free_fn, NULL);
kfree(optee);
}
static int optee_ffa_probe(struct ffa_device *ffa_dev)
{
const struct ffa_dev_ops *ffa_ops;
unsigned int rpc_arg_count;
struct tee_device *teedev;
struct optee *optee;
int rc;
ffa_ops = ffa_dev_ops_get(ffa_dev);
if (!ffa_ops) {
pr_warn("failed \"method\" init: ffa\n");
return -ENOENT;
}
if (!optee_ffa_api_is_compatbile(ffa_dev, ffa_ops))
return -EINVAL;
if (!optee_ffa_exchange_caps(ffa_dev, ffa_ops, &rpc_arg_count))
return -EINVAL;
optee = kzalloc(sizeof(*optee), GFP_KERNEL);
if (!optee) {
rc = -ENOMEM;
goto err;
}
optee->pool = optee_ffa_config_dyn_shm();
if (IS_ERR(optee->pool)) {
rc = PTR_ERR(optee->pool);
optee->pool = NULL;
goto err;
}
optee->ops = &optee_ffa_ops;
optee->ffa.ffa_dev = ffa_dev;
optee->ffa.ffa_ops = ffa_ops;
optee->rpc_arg_count = rpc_arg_count;
teedev = tee_device_alloc(&optee_ffa_clnt_desc, NULL, optee->pool,
optee);
if (IS_ERR(teedev)) {
rc = PTR_ERR(teedev);
goto err;
}
optee->teedev = teedev;
teedev = tee_device_alloc(&optee_ffa_supp_desc, NULL, optee->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;
rc = rhashtable_init(&optee->ffa.global_ids, &shm_rhash_params);
if (rc)
goto err;
mutex_init(&optee->ffa.mutex);
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);
ffa_dev_set_drvdata(ffa_dev, optee);
rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
if (rc) {
optee_ffa_remove(ffa_dev);
return rc;
}
pr_info("initialized driver\n");
return 0;
err:
/*
* 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);
if (optee->pool)
tee_shm_pool_free(optee->pool);
kfree(optee);
return rc;
}
static const struct ffa_device_id optee_ffa_device_id[] = {
/* 486178e0-e7f8-11e3-bc5e0002a5d5c51b */
{ UUID_INIT(0x486178e0, 0xe7f8, 0x11e3,
0xbc, 0x5e, 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b) },
{}
};
static struct ffa_driver optee_ffa_driver = {
.name = "optee",
.probe = optee_ffa_probe,
.remove = optee_ffa_remove,
.id_table = optee_ffa_device_id,
};
int optee_ffa_abi_register(void)
{
if (IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT))
return ffa_register(&optee_ffa_driver);
else
return -EOPNOTSUPP;
}
void optee_ffa_abi_unregister(void)
{
if (IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT))
ffa_unregister(&optee_ffa_driver);
}

153
drivers/tee/optee/optee_ffa.h Normal file
View File

@@ -0,0 +1,153 @@
/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (c) 2019-2021, Linaro Limited
*/
/*
* This file is exported by OP-TEE and is kept in sync between secure world
* and normal world drivers. We're using ARM FF-A 1.0 specification.
*/
#ifndef __OPTEE_FFA_H
#define __OPTEE_FFA_H
#include <linux/arm_ffa.h>
/*
* Normal world sends requests with FFA_MSG_SEND_DIRECT_REQ and
* responses are returned with FFA_MSG_SEND_DIRECT_RESP for normal
* messages.
*
* All requests with FFA_MSG_SEND_DIRECT_REQ and FFA_MSG_SEND_DIRECT_RESP
* are using the AArch32 SMC calling convention with register usage as
* defined in FF-A specification:
* w0: Function ID (0x8400006F or 0x84000070)
* w1: Source/Destination IDs
* w2: Reserved (MBZ)
* w3-w7: Implementation defined, free to be used below
*/
#define OPTEE_FFA_VERSION_MAJOR 1
#define OPTEE_FFA_VERSION_MINOR 0
#define OPTEE_FFA_BLOCKING_CALL(id) (id)
#define OPTEE_FFA_YIELDING_CALL_BIT 31
#define OPTEE_FFA_YIELDING_CALL(id) ((id) | BIT(OPTEE_FFA_YIELDING_CALL_BIT))
/*
* Returns the API version implemented, currently follows the FF-A version.
* Call register usage:
* w3: Service ID, OPTEE_FFA_GET_API_VERSION
* w4-w7: Not used (MBZ)
*
* Return register usage:
* w3: OPTEE_FFA_VERSION_MAJOR
* w4: OPTEE_FFA_VERSION_MINOR
* w5-w7: Not used (MBZ)
*/
#define OPTEE_FFA_GET_API_VERSION OPTEE_FFA_BLOCKING_CALL(0)
/*
* Returns the revision of OP-TEE.
*
* Used by non-secure world to figure out which version of the Trusted OS
* is installed. Note that the returned revision is the revision of the
* Trusted OS, not of the API.
*
* Call register usage:
* w3: Service ID, OPTEE_FFA_GET_OS_VERSION
* w4-w7: Unused (MBZ)
*
* Return register usage:
* w3: CFG_OPTEE_REVISION_MAJOR
* w4: CFG_OPTEE_REVISION_MINOR
* w5: TEE_IMPL_GIT_SHA1 (or zero if not supported)
*/
#define OPTEE_FFA_GET_OS_VERSION OPTEE_FFA_BLOCKING_CALL(1)
/*
* Exchange capabilities between normal world and secure world.
*
* Currently there are no defined capabilities. When features are added new
* capabilities may be added.
*
* Call register usage:
* w3: Service ID, OPTEE_FFA_EXCHANGE_CAPABILITIES
* w4-w7: Note used (MBZ)
*
* Return register usage:
* w3: Error code, 0 on success
* w4: Bit[7:0]: Number of parameters needed for RPC to be supplied
* as the second MSG arg struct for
* OPTEE_FFA_YIELDING_CALL_WITH_ARG.
* Bit[31:8]: Reserved (MBZ)
* w5-w7: Note used (MBZ)
*/
#define OPTEE_FFA_EXCHANGE_CAPABILITIES OPTEE_FFA_BLOCKING_CALL(2)
/*
* Unregister shared memory
*
* Call register usage:
* w3: Service ID, OPTEE_FFA_YIELDING_CALL_UNREGISTER_SHM
* w4: Shared memory handle, lower bits
* w5: Shared memory handle, higher bits
* w6-w7: Not used (MBZ)
*
* Return register usage:
* w3: Error code, 0 on success
* w4-w7: Note used (MBZ)
*/
#define OPTEE_FFA_UNREGISTER_SHM OPTEE_FFA_BLOCKING_CALL(3)
/*
* Call with struct optee_msg_arg as argument in the supplied shared memory
* with a zero internal offset and normal cached memory attributes.
* Register usage:
* w3: Service ID, OPTEE_FFA_YIELDING_CALL_WITH_ARG
* w4: Lower 32 bits of a 64-bit Shared memory handle
* w5: Upper 32 bits of a 64-bit Shared memory handle
* w6: Offset into shared memory pointing to a struct optee_msg_arg
* right after the parameters of this struct (at offset
* OPTEE_MSG_GET_ARG_SIZE(num_params) follows a struct optee_msg_arg
* for RPC, this struct has reserved space for the number of RPC
* parameters as returned by OPTEE_FFA_EXCHANGE_CAPABILITIES.
* w7: Not used (MBZ)
* Resume from RPC. Register usage:
* w3: Service ID, OPTEE_FFA_YIELDING_CALL_RESUME
* w4-w6: Not used (MBZ)
* w7: Resume info
*
* Normal return (yielding call is completed). Register usage:
* w3: Error code, 0 on success
* w4: OPTEE_FFA_YIELDING_CALL_RETURN_DONE
* w5-w7: Not used (MBZ)
*
* RPC interrupt return (RPC from secure world). Register usage:
* w3: Error code == 0
* w4: Any defined RPC code but OPTEE_FFA_YIELDING_CALL_RETURN_DONE
* w5-w6: Not used (MBZ)
* w7: Resume info
*
* Possible error codes in register w3:
* 0: Success
* FFA_DENIED: w4 isn't one of OPTEE_FFA_YIELDING_CALL_START
* OPTEE_FFA_YIELDING_CALL_RESUME
*
* Possible error codes for OPTEE_FFA_YIELDING_CALL_START,
* FFA_BUSY: Number of OP-TEE OS threads exceeded,
* try again later
* FFA_DENIED: RPC shared memory object not found
* FFA_INVALID_PARAMETER: Bad shared memory handle or offset into the memory
*
* Possible error codes for OPTEE_FFA_YIELDING_CALL_RESUME
* FFA_INVALID_PARAMETER: Bad resume info
*/
#define OPTEE_FFA_YIELDING_CALL_WITH_ARG OPTEE_FFA_YIELDING_CALL(0)
#define OPTEE_FFA_YIELDING_CALL_RESUME OPTEE_FFA_YIELDING_CALL(1)
#define OPTEE_FFA_YIELDING_CALL_RETURN_DONE 0
#define OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD 1
#define OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT 2
#endif /*__OPTEE_FFA_H*/

27
drivers/tee/optee/optee_msg.h
View File

@@ -28,6 +28,9 @@
#define OPTEE_MSG_ATTR_TYPE_RMEM_INPUT 0x5
#define OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT 0x6
#define OPTEE_MSG_ATTR_TYPE_RMEM_INOUT 0x7
#define OPTEE_MSG_ATTR_TYPE_FMEM_INPUT OPTEE_MSG_ATTR_TYPE_RMEM_INPUT
#define OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT OPTEE_MSG_ATTR_TYPE_RMEM_OUTPUT
#define OPTEE_MSG_ATTR_TYPE_FMEM_INOUT OPTEE_MSG_ATTR_TYPE_RMEM_INOUT
#define OPTEE_MSG_ATTR_TYPE_TMEM_INPUT 0x9
#define OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT 0xa
#define OPTEE_MSG_ATTR_TYPE_TMEM_INOUT 0xb
@@ -96,6 +99,8 @@
*/
#define OPTEE_MSG_NONCONTIG_PAGE_SIZE 4096
#define OPTEE_MSG_FMEM_INVALID_GLOBAL_ID 0xffffffffffffffff
/**
* struct optee_msg_param_tmem - temporary memory reference parameter
* @buf_ptr: Address of the buffer
@@ -127,6 +132,23 @@ struct optee_msg_param_rmem {
u64 shm_ref;
};
/**
* struct optee_msg_param_fmem - ffa memory reference parameter
* @offs_lower: Lower bits of offset into shared memory reference
* @offs_upper: Upper bits of offset into shared memory reference
* @internal_offs: Internal offset into the first page of shared memory
* reference
* @size: Size of the buffer
* @global_id: Global identifier of Shared memory
*/
struct optee_msg_param_fmem {
u32 offs_low;
u16 offs_high;
u16 internal_offs;
u64 size;
u64 global_id;
};
/**
* struct optee_msg_param_value - opaque value parameter
*
@@ -143,13 +165,15 @@ struct optee_msg_param_value {
* @attr: attributes
* @tmem: parameter by temporary memory reference
* @rmem: parameter by registered memory reference
* @fmem: parameter by ffa registered memory reference
* @value: parameter by opaque value
* @octets: parameter by octet string
*
* @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in
* the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value or octets,
* OPTEE_MSG_ATTR_TYPE_TMEM_* indicates @tmem and
* OPTEE_MSG_ATTR_TYPE_RMEM_* indicates @rmem,
* OPTEE_MSG_ATTR_TYPE_RMEM_* or the alias PTEE_MSG_ATTR_TYPE_FMEM_* indicates
* @rmem or @fmem depending on the conduit.
* OPTEE_MSG_ATTR_TYPE_NONE indicates that none of the members are used.
*/
struct optee_msg_param {
@@ -157,6 +181,7 @@ struct optee_msg_param {
union {
struct optee_msg_param_tmem tmem;
struct optee_msg_param_rmem rmem;
struct optee_msg_param_fmem fmem;
struct optee_msg_param_value value;
u8 octets[24];
} u;

160
drivers/tee/optee/optee_private.h
View File

@@ -1,17 +1,20 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2015, Linaro Limited
* Copyright (c) 2015-2021, Linaro Limited
*/
#ifndef OPTEE_PRIVATE_H
#define OPTEE_PRIVATE_H
#include <linux/arm-smccc.h>
#include <linux/rhashtable.h>
#include <linux/semaphore.h>
#include <linux/tee_drv.h>
#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 */
@@ -20,6 +23,7 @@
#define TEEC_ERROR_NOT_SUPPORTED 0xFFFF000A
#define TEEC_ERROR_COMMUNICATION 0xFFFF000E
#define TEEC_ERROR_OUT_OF_MEMORY 0xFFFF000C
#define TEEC_ERROR_BUSY 0xFFFF000D
#define TEEC_ERROR_SHORT_BUFFER 0xFFFF0010
#define TEEC_ORIGIN_COMMS 0x00000002
@@ -29,6 +33,11 @@ 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;
@@ -66,19 +75,65 @@ struct optee_supp {
struct completion reqs_c;
};
struct optee_smc {
optee_invoke_fn *invoke_fn;
void *memremaped_shm;
u32 sec_caps;
};
/**
* struct optee_ffa_data - FFA communication struct
* @ffa_dev FFA device, contains the destination id, the id of
* OP-TEE in secure world
* @ffa_ops FFA operations
* @mutex Serializes access to @global_ids
* @global_ids FF-A shared memory global handle translation
*/
struct optee_ffa {
struct ffa_device *ffa_dev;
const struct ffa_dev_ops *ffa_ops;
/* Serializes access to @global_ids */
struct mutex mutex;
struct rhashtable global_ids;
};
struct optee;
/**
* struct optee_ops - OP-TEE driver internal operations
* @do_call_with_arg: enters OP-TEE in secure world
* @to_msg_param: converts from struct tee_param to OPTEE_MSG parameters
* @from_msg_param: converts from OPTEE_MSG parameters to struct tee_param
*
* These OPs are only supposed to be used internally in the OP-TEE driver
* as a way of abstracting the different methogs of entering OP-TEE in
* secure world.
*/
struct optee_ops {
int (*do_call_with_arg)(struct tee_context *ctx,
struct tee_shm *shm_arg);
int (*to_msg_param)(struct optee *optee,
struct optee_msg_param *msg_params,
size_t num_params, const struct tee_param *params);
int (*from_msg_param)(struct optee *optee, struct tee_param *params,
size_t num_params,
const struct optee_msg_param *msg_params);
};
/**
* struct optee - main service struct
* @supp_teedev: supplicant device
* @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
* @ffa: specific to FF-A 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
* @rpc_arg_count: If > 0 number of RPC parameters to make room for
* @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
@@ -86,13 +141,16 @@ struct optee_supp {
struct optee {
struct tee_device *supp_teedev;
struct tee_device *teedev;
optee_invoke_fn *invoke_fn;
const struct optee_ops *ops;
union {
struct optee_smc smc;
struct optee_ffa ffa;
};
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;
unsigned int rpc_arg_count;
bool scan_bus_done;
struct workqueue_struct *scan_bus_wq;
struct work_struct scan_bus_work;
@@ -127,10 +185,6 @@ 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);
@@ -148,42 +202,68 @@ 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);
u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg);
int optee_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param);
int optee_close_session_helper(struct tee_context *ctx, u32 session);
int optee_close_session(struct tee_context *ctx, u32 session);
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);
int optee_from_msg_param(struct tee_param *params, size_t num_params,
const struct optee_msg_param *msg_params);
int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
const struct tee_param *params);
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
@@ -200,4 +280,10 @@ 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);
int optee_ffa_abi_register(void);
void optee_ffa_abi_unregister(void);
#endif /*OPTEE_PRIVATE_H*/

237
drivers/tee/optee/rpc.c
View File

@@ -1,17 +1,15 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015-2016, Linaro Limited
* Copyright (c) 2015-2021, Linaro Limited
*/
#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 {
@@ -55,6 +53,7 @@ static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
struct optee_msg_arg *arg)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct tee_param *params;
struct i2c_adapter *adapter;
struct i2c_msg msg = { };
@@ -79,7 +78,8 @@ static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
return;
}
if (optee_from_msg_param(params, arg->num_params, arg->params))
if (optee->ops->from_msg_param(optee, params, arg->num_params,
arg->params))
goto bad;
for (i = 0; i < arg->num_params; i++) {
@@ -122,7 +122,8 @@ static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
arg->ret = TEEC_ERROR_COMMUNICATION;
} else {
params[3].u.value.a = msg.len;
if (optee_to_msg_param(arg->params, arg->num_params, params))
if (optee->ops->to_msg_param(optee, arg->params,
arg->num_params, params))
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
else
arg->ret = TEEC_SUCCESS;
@@ -234,7 +235,7 @@ static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
}
static void handle_rpc_supp_cmd(struct tee_context *ctx,
static void handle_rpc_supp_cmd(struct tee_context *ctx, struct optee *optee,
struct optee_msg_arg *arg)
{
struct tee_param *params;
@@ -248,20 +249,22 @@ static void handle_rpc_supp_cmd(struct tee_context *ctx,
return;
}
if (optee_from_msg_param(params, arg->num_params, arg->params)) {
if (optee->ops->from_msg_param(optee, params, arg->num_params,
arg->params)) {
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
goto out;
}
arg->ret = optee_supp_thrd_req(ctx, arg->cmd, arg->num_params, params);
if (optee_to_msg_param(arg->params, arg->num_params, params))
if (optee->ops->to_msg_param(optee, arg->params, arg->num_params,
params))
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
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;
@@ -284,103 +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;
@@ -405,60 +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);
@@ -469,73 +325,12 @@ 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;
default:
handle_rpc_supp_cmd(ctx, arg);
handle_rpc_supp_cmd(ctx, optee, arg);
}
}
/**
* 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
View File

File diff suppressed because it is too large Load Diff

7
include/linux/tee_drv.h
View File

@@ -197,7 +197,11 @@ int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method,
* @num_pages: number of locked pages
* @dmabuf: dmabuf used to for exporting to user space
* @flags: defined by TEE_SHM_* in tee_drv.h
* @id: unique id of a shared memory object on this device
* @id: unique id of a shared memory object on this device, shared
* with user space
* @sec_world_id:
* secure world assigned id of this shared memory object, not
* used by all drivers
*
* This pool is only supposed to be accessed directly from the TEE
* subsystem and from drivers that implements their own shm pool manager.
@@ -213,6 +217,7 @@ struct tee_shm {
struct dma_buf *dmabuf;
u32 flags;
int id;
u64 sec_world_id;
};
/**