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TEE shared memory cleanup for v5.18

Browse source 
- The TEE shared memory pool based on two pools is replaced with a single
   somewhat more capable pool.
 - Replaces tee_shm_alloc() and tee_shm_register() with new functions
   easier to use and maintain.  The TEE subsystem and the TEE drivers are
   updated to use the new functions instead.
 - The TEE based Trusted keys routines are updated to use the new
   simplified functions above.
 - The OP-TEE based rng driver is updated to use the new simplified
   functions above.
 - The TEE_SHM-flags are refactored to better match their usage
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Merge tag 'tee-shm-for-v5.18' of git://git.linaro.org:/people/jens.wiklander/linux-tee into arm/drivers

TEE shared memory cleanup for v5.18

- The TEE shared memory pool based on two pools is replaced with a single
  somewhat more capable pool.
- Replaces tee_shm_alloc() and tee_shm_register() with new functions
  easier to use and maintain.  The TEE subsystem and the TEE drivers are
  updated to use the new functions instead.
- The TEE based Trusted keys routines are updated to use the new
  simplified functions above.
- The OP-TEE based rng driver is updated to use the new simplified
  functions above.
- The TEE_SHM-flags are refactored to better match their usage

* tag 'tee-shm-for-v5.18' of git://git.linaro.org:/people/jens.wiklander/linux-tee:
  tee: refactor TEE_SHM_* flags
  tee: replace tee_shm_register()
  KEYS: trusted: tee: use tee_shm_register_kernel_buf()
  tee: add tee_shm_register_{user,kernel}_buf()
  optee: add optee_pool_op_free_helper()
  tee: replace tee_shm_alloc()
  tee: simplify shm pool handling
  tee: add tee_shm_alloc_user_buf()
  tee: remove unused tee_shm_pool_alloc_res_mem()
  hwrng: optee-rng: use tee_shm_alloc_kernel_buf()
  optee: use driver internal tee_context for some rpc

Link: https://lore.kernel.org/r/20220218184802.GA968155@jade
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2022-02-25 17:05:11 +01:00
parent bc5ede20b8 a45ea4efa3
commit 25b67f373b
15 changed files with 455 additions and 637 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/char/hw_random/optee-rng.c
View file

@ -145,10 +145,10 @@ static int optee_rng_init(struct hwrng *rng)
struct optee_rng_private *pvt_data = to_optee_rng_private(rng);
struct tee_shm *entropy_shm_pool = NULL;
entropy_shm_pool = tee_shm_alloc(pvt_data->ctx, MAX_ENTROPY_REQ_SZ,
TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
entropy_shm_pool = tee_shm_alloc_kernel_buf(pvt_data->ctx,
MAX_ENTROPY_REQ_SZ);
if (IS_ERR(entropy_shm_pool)) {
dev_err(pvt_data->dev, "tee_shm_alloc failed\n");
dev_err(pvt_data->dev, "tee_shm_alloc_kernel_buf failed\n");
return PTR_ERR(entropy_shm_pool);
}

55
drivers/tee/amdtee/shm_pool.c
View file

@ -8,13 +8,17 @@
#include <linux/psp-sev.h>
#include "amdtee_private.h"
static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm,
size_t size)
static int pool_op_alloc(struct tee_shm_pool *pool, struct tee_shm *shm,
size_t size, size_t align)
{
unsigned int order = get_order(size);
unsigned long va;
int rc;
/*
* Ignore alignment since this is already going to be page aligned
* and there's no need for any larger alignment.
*/
va = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!va)
return -ENOMEM;
@ -34,7 +38,7 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm,
return 0;
}
static void pool_op_free(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm)
static void pool_op_free(struct tee_shm_pool *pool, struct tee_shm *shm)
{
/* Unmap the shared memory from TEE */
amdtee_unmap_shmem(shm);
@ -42,52 +46,25 @@ static void pool_op_free(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm)
shm->kaddr = NULL;
}
static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
static void pool_op_destroy_pool(struct tee_shm_pool *pool)
{
kfree(poolm);
kfree(pool);
}
static const struct tee_shm_pool_mgr_ops pool_ops = {
static const struct tee_shm_pool_ops pool_ops = {
.alloc = pool_op_alloc,
.free = pool_op_free,
.destroy_poolmgr = pool_op_destroy_poolmgr,
.destroy_pool = pool_op_destroy_pool,
};
static struct tee_shm_pool_mgr *pool_mem_mgr_alloc(void)
{
struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
if (!mgr)
return ERR_PTR(-ENOMEM);
mgr->ops = &pool_ops;
return mgr;
}
struct tee_shm_pool *amdtee_config_shm(void)
{
struct tee_shm_pool_mgr *priv_mgr;
struct tee_shm_pool_mgr *dmabuf_mgr;
void *rc;
struct tee_shm_pool *pool = kzalloc(sizeof(*pool), GFP_KERNEL);
rc = pool_mem_mgr_alloc();
if (IS_ERR(rc))
return rc;
priv_mgr = rc;
if (!pool)
return ERR_PTR(-ENOMEM);
rc = pool_mem_mgr_alloc();
if (IS_ERR(rc)) {
tee_shm_pool_mgr_destroy(priv_mgr);
return rc;
}
dmabuf_mgr = rc;
pool->ops = &pool_ops;
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;
return pool;
}

8
drivers/tee/optee/Kconfig
View file

@ -7,11 +7,3 @@ config OPTEE
help
This implements the OP-TEE Trusted Execution Environment (TEE)
driver.
config OPTEE_SHM_NUM_PRIV_PAGES
int "Private Shared Memory Pages"
default 1
depends on OPTEE
help
This sets the number of private shared memory pages to be
used by OP-TEE TEE driver.

2
drivers/tee/optee/call.c
View file

@ -120,7 +120,7 @@ struct tee_shm *optee_get_msg_arg(struct tee_context *ctx, size_t num_params,
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);
shm = tee_shm_alloc_priv_buf(ctx, sz);
if (IS_ERR(shm))
return shm;

22
drivers/tee/optee/core.c
View file

@ -18,8 +18,8 @@
#include <linux/workqueue.h>
#include "optee_private.h"
int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm, size_t size,
int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
size_t size, size_t align,
int (*shm_register)(struct tee_context *ctx,
struct tee_shm *shm,
struct page **pages,
@ -30,6 +30,10 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
struct page *page;
int rc = 0;
/*
* Ignore alignment since this is already going to be page aligned
* and there's no need for any larger alignment.
*/
page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!page)
return -ENOMEM;
@ -51,7 +55,6 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
for (i = 0; i < nr_pages; i++)
pages[i] = page + i;
shm->flags |= TEE_SHM_REGISTER;
rc = shm_register(shm->ctx, shm, pages, nr_pages,
(unsigned long)shm->kaddr);
kfree(pages);
@ -62,10 +65,20 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
return 0;
err:
__free_pages(page, order);
free_pages((unsigned long)shm->kaddr, order);
return rc;
}
void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
int (*shm_unregister)(struct tee_context *ctx,
struct tee_shm *shm))
{
if (shm_unregister)
shm_unregister(shm->ctx, shm);
free_pages((unsigned long)shm->kaddr, get_order(shm->size));
shm->kaddr = NULL;
}
static void optee_bus_scan(struct work_struct *work)
{
WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
@ -158,6 +171,7 @@ void optee_remove_common(struct optee *optee)
optee_unregister_devices();
optee_notif_uninit(optee);
teedev_close_context(optee->ctx);
/*
* The two devices have to be unregistered before we can free the
* other resources.

5
drivers/tee/optee/device.c
View file

@ -121,10 +121,9 @@ static int __optee_enumerate_devices(u32 func)
if (rc < 0 || !shm_size)
goto out_sess;
device_shm = tee_shm_alloc(ctx, shm_size,
TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
device_shm = tee_shm_alloc_kernel_buf(ctx, shm_size);
if (IS_ERR(device_shm)) {
pr_err("tee_shm_alloc failed\n");
pr_err("tee_shm_alloc_kernel_buf failed\n");
rc = PTR_ERR(device_shm);
goto out_sess;
}

136
drivers/tee/optee/ffa_abi.c
View file

@ -369,30 +369,28 @@ static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
* 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)
static int pool_ffa_op_alloc(struct tee_shm_pool *pool,
struct tee_shm *shm, size_t size, size_t align)
{
return optee_pool_op_alloc_helper(poolm, shm, size,
return optee_pool_op_alloc_helper(pool, shm, size, align,
optee_ffa_shm_register);
}
static void pool_ffa_op_free(struct tee_shm_pool_mgr *poolm,
static void pool_ffa_op_free(struct tee_shm_pool *pool,
struct tee_shm *shm)
{
optee_ffa_shm_unregister(shm->ctx, shm);
free_pages((unsigned long)shm->kaddr, get_order(shm->size));
shm->kaddr = NULL;
optee_pool_op_free_helper(pool, shm, optee_ffa_shm_unregister);
}
static void pool_ffa_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
static void pool_ffa_op_destroy_pool(struct tee_shm_pool *pool)
{
kfree(poolm);
kfree(pool);
}
static const struct tee_shm_pool_mgr_ops pool_ffa_ops = {
static const struct tee_shm_pool_ops pool_ffa_ops = {
.alloc = pool_ffa_op_alloc,
.free = pool_ffa_op_free,
.destroy_poolmgr = pool_ffa_op_destroy_poolmgr,
.destroy_pool = pool_ffa_op_destroy_pool,
};
/**
@ -401,16 +399,16 @@ static const struct tee_shm_pool_mgr_ops pool_ffa_ops = {
* 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)
static struct tee_shm_pool *optee_ffa_shm_pool_alloc_pages(void)
{
struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
struct tee_shm_pool *pool = kzalloc(sizeof(*pool), GFP_KERNEL);
if (!mgr)
if (!pool)
return ERR_PTR(-ENOMEM);
mgr->ops = &pool_ffa_ops;
pool->ops = &pool_ffa_ops;
return mgr;
return pool;
}
/*
@ -424,6 +422,7 @@ static struct tee_shm_pool_mgr *optee_ffa_shm_pool_alloc_pages(void)
*/
static void handle_ffa_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
struct optee *optee,
struct optee_msg_arg *arg)
{
struct tee_shm *shm;
@ -439,8 +438,8 @@ static void handle_ffa_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
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);
shm = tee_shm_alloc_priv_buf(optee->ctx,
arg->params[0].u.value.b);
break;
default:
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
@ -493,14 +492,13 @@ static void handle_ffa_rpc_func_cmd_shm_free(struct tee_context *ctx,
}
static void handle_ffa_rpc_func_cmd(struct tee_context *ctx,
struct optee *optee,
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);
handle_ffa_rpc_func_cmd_shm_alloc(ctx, optee, arg);
break;
case OPTEE_RPC_CMD_SHM_FREE:
handle_ffa_rpc_func_cmd_shm_free(ctx, optee, arg);
@ -510,12 +508,12 @@ static void handle_ffa_rpc_func_cmd(struct tee_context *ctx,
}
}
static void optee_handle_ffa_rpc(struct tee_context *ctx, u32 cmd,
struct optee_msg_arg *arg)
static void optee_handle_ffa_rpc(struct tee_context *ctx, struct optee *optee,
u32 cmd, struct optee_msg_arg *arg)
{
switch (cmd) {
case OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD:
handle_ffa_rpc_func_cmd(ctx, arg);
handle_ffa_rpc_func_cmd(ctx, optee, arg);
break;
case OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT:
/* Interrupt delivered by now */
@ -582,7 +580,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
* above.
*/
cond_resched();
optee_handle_ffa_rpc(ctx, data->data1, rpc_arg);
optee_handle_ffa_rpc(ctx, optee, data->data1, rpc_arg);
cmd = OPTEE_FFA_YIELDING_CALL_RESUME;
data->data0 = cmd;
data->data1 = 0;
@ -691,33 +689,6 @@ static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev,
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)
{
@ -793,7 +764,9 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev)
{
const struct ffa_dev_ops *ffa_ops;
unsigned int rpc_arg_count;
struct tee_shm_pool *pool;
struct tee_device *teedev;
struct tee_context *ctx;
struct optee *optee;
int rc;
@ -813,12 +786,12 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev)
if (!optee)
return -ENOMEM;
optee->pool = optee_ffa_config_dyn_shm();
if (IS_ERR(optee->pool)) {
rc = PTR_ERR(optee->pool);
optee->pool = NULL;
goto err;
pool = optee_ffa_shm_pool_alloc_pages();
if (IS_ERR(pool)) {
rc = PTR_ERR(pool);
goto err_free_optee;
}
optee->pool = pool;
optee->ops = &optee_ffa_ops;
optee->ffa.ffa_dev = ffa_dev;
@ -829,7 +802,7 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev)
optee);
if (IS_ERR(teedev)) {
rc = PTR_ERR(teedev);
goto err;
goto err_free_pool;
}
optee->teedev = teedev;
@ -837,50 +810,57 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev)
optee);
if (IS_ERR(teedev)) {
rc = PTR_ERR(teedev);
goto err;
goto err_unreg_teedev;
}
optee->supp_teedev = teedev;
rc = tee_device_register(optee->teedev);
if (rc)
goto err;
goto err_unreg_supp_teedev;
rc = tee_device_register(optee->supp_teedev);
if (rc)
goto err;
goto err_unreg_supp_teedev;
rc = rhashtable_init(&optee->ffa.global_ids, &shm_rhash_params);
if (rc)
goto err;
goto err_unreg_supp_teedev;
mutex_init(&optee->ffa.mutex);
mutex_init(&optee->call_queue.mutex);
INIT_LIST_HEAD(&optee->call_queue.waiters);
optee_supp_init(&optee->supp);
ffa_dev_set_drvdata(ffa_dev, optee);
ctx = teedev_open(optee->teedev);
if (IS_ERR(ctx))
goto err_rhashtable_free;
optee->ctx = ctx;
rc = optee_notif_init(optee, OPTEE_DEFAULT_MAX_NOTIF_VALUE);
if (rc) {
optee_ffa_remove(ffa_dev);
return rc;
}
if (rc)
goto err_close_ctx;
rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
if (rc) {
optee_ffa_remove(ffa_dev);
return rc;
}
if (rc)
goto err_unregister_devices;
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.
*/
err_unregister_devices:
optee_unregister_devices();
optee_notif_uninit(optee);
err_close_ctx:
teedev_close_context(ctx);
err_rhashtable_free:
rhashtable_free_and_destroy(&optee->ffa.global_ids, rh_free_fn, NULL);
optee_supp_uninit(&optee->supp);
mutex_destroy(&optee->call_queue.mutex);
err_unreg_supp_teedev:
tee_device_unregister(optee->supp_teedev);
err_unreg_teedev:
tee_device_unregister(optee->teedev);
if (optee->pool)
tee_shm_pool_free(optee->pool);
err_free_pool:
tee_shm_pool_free(pool);
err_free_optee:
kfree(optee);
return rc;
}

12
drivers/tee/optee/optee_private.h
View file

@ -53,7 +53,6 @@ struct optee_call_queue {
struct optee_notif {
u_int max_key;
struct tee_context *ctx;
/* Serializes access to the elements below in this struct */
spinlock_t lock;
struct list_head db;
@ -134,9 +133,10 @@ struct optee_ops {
/**
* struct optee - main service struct
* @supp_teedev: supplicant device
* @teedev: client device
* @ops: internal callbacks for different ways to reach secure
* world
* @teedev: client device
* @ctx: driver internal TEE context
* @smc: specific to SMC ABI
* @ffa: specific to FF-A ABI
* @call_queue: queue of threads waiting to call @invoke_fn
@ -152,6 +152,7 @@ struct optee {
struct tee_device *supp_teedev;
struct tee_device *teedev;
const struct optee_ops *ops;
struct tee_context *ctx;
union {
struct optee_smc smc;
struct optee_ffa ffa;
@ -228,13 +229,16 @@ int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
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 optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
size_t size, size_t align,
int (*shm_register)(struct tee_context *ctx,
struct tee_shm *shm,
struct page **pages,
size_t num_pages,
unsigned long start));
void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
int (*shm_unregister)(struct tee_context *ctx,
struct tee_shm *shm));
void optee_remove_common(struct optee *optee);

167
drivers/tee/optee/smc_abi.c
View file

@ -42,7 +42,15 @@
* 6. Driver initialization.
*/
#define OPTEE_SHM_NUM_PRIV_PAGES CONFIG_OPTEE_SHM_NUM_PRIV_PAGES
/*
* A typical OP-TEE private shm allocation is 224 bytes (argument struct
* with 6 parameters, needed for open session). So with an alignment of 512
* we'll waste a bit more than 50%. However, it's only expected that we'll
* have a handful of these structs allocated at a time. Most memory will
* be allocated aligned to the page size, So all in all this should scale
* up and down quite well.
*/
#define OPTEE_MIN_STATIC_POOL_ALIGN 9 /* 512 bytes aligned */
/*
* 1. Convert between struct tee_param and struct optee_msg_param
@ -230,7 +238,7 @@ static int optee_to_msg_param(struct optee *optee,
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))
if (tee_shm_is_dynamic(p->u.memref.shm))
rc = to_msg_param_reg_mem(mp, p);
else
rc = to_msg_param_tmp_mem(mp, p);
@ -532,38 +540,38 @@ static int optee_shm_unregister_supp(struct tee_context *ctx,
* The main function is optee_shm_pool_alloc_pages().
*/
static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm, size_t size)
static int pool_op_alloc(struct tee_shm_pool *pool,
struct tee_shm *shm, size_t size, size_t align)
{
/*
* Shared memory private to the OP-TEE driver doesn't need
* to be registered with OP-TEE.
*/
if (shm->flags & TEE_SHM_PRIV)
return optee_pool_op_alloc_helper(poolm, shm, size, NULL);
return optee_pool_op_alloc_helper(pool, shm, size, align, NULL);
return optee_pool_op_alloc_helper(poolm, shm, size, optee_shm_register);
return optee_pool_op_alloc_helper(pool, shm, size, align,
optee_shm_register);
}
static void pool_op_free(struct tee_shm_pool_mgr *poolm,
static void pool_op_free(struct tee_shm_pool *pool,
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;
optee_pool_op_free_helper(pool, shm, optee_shm_unregister);
else
optee_pool_op_free_helper(pool, shm, NULL);
}
static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
static void pool_op_destroy_pool(struct tee_shm_pool *pool)
{
kfree(poolm);
kfree(pool);
}
static const struct tee_shm_pool_mgr_ops pool_ops = {
static const struct tee_shm_pool_ops pool_ops = {
.alloc = pool_op_alloc,
.free = pool_op_free,
.destroy_poolmgr = pool_op_destroy_poolmgr,
.destroy_pool = pool_op_destroy_pool,
};
/**
@ -572,16 +580,16 @@ static const struct tee_shm_pool_mgr_ops pool_ops = {
* This pool is used when OP-TEE supports dymanic SHM. In this case
* command buffers and such are allocated from kernel's own memory.
*/
static struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)
static struct tee_shm_pool *optee_shm_pool_alloc_pages(void)
{
struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
struct tee_shm_pool *pool = kzalloc(sizeof(*pool), GFP_KERNEL);
if (!mgr)
if (!pool)
return ERR_PTR(-ENOMEM);
mgr->ops = &pool_ops;
pool->ops = &pool_ops;
return mgr;
return pool;
}
/*
@ -622,6 +630,7 @@ static void handle_rpc_func_cmd_shm_free(struct tee_context *ctx,
}
static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
struct optee *optee,
struct optee_msg_arg *arg,
struct optee_call_ctx *call_ctx)
{
@ -651,7 +660,7 @@ static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
shm = optee_rpc_cmd_alloc_suppl(ctx, sz);
break;
case OPTEE_RPC_SHM_TYPE_KERNEL:
shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED | TEE_SHM_PRIV);
shm = tee_shm_alloc_priv_buf(optee->ctx, sz);
break;
default:
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
@ -670,7 +679,7 @@ static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
sz = tee_shm_get_size(shm);
if (tee_shm_is_registered(shm)) {
if (tee_shm_is_dynamic(shm)) {
struct page **pages;
u64 *pages_list;
size_t page_num;
@ -747,7 +756,7 @@ static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee,
switch (arg->cmd) {
case OPTEE_RPC_CMD_SHM_ALLOC:
free_pages_list(call_ctx);
handle_rpc_func_cmd_shm_alloc(ctx, arg, call_ctx);
handle_rpc_func_cmd_shm_alloc(ctx, optee, arg, call_ctx);
break;
case OPTEE_RPC_CMD_SHM_FREE:
handle_rpc_func_cmd_shm_free(ctx, arg);
@ -776,8 +785,7 @@ static void optee_handle_rpc(struct tee_context *ctx,
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);
shm = tee_shm_alloc_priv_buf(optee->ctx, param->a1);
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,
@ -954,57 +962,34 @@ static irqreturn_t notif_irq_thread_fn(int irq, void *dev_id)
{
struct optee *optee = dev_id;
optee_smc_do_bottom_half(optee->notif.ctx);
optee_smc_do_bottom_half(optee->ctx);
return IRQ_HANDLED;
}
static int optee_smc_notif_init_irq(struct optee *optee, u_int irq)
{
struct tee_context *ctx;
int rc;
ctx = teedev_open(optee->teedev);
if (IS_ERR(ctx))
return PTR_ERR(ctx);
optee->notif.ctx = ctx;
rc = request_threaded_irq(irq, notif_irq_handler,
notif_irq_thread_fn,
0, "optee_notification", optee);
if (rc)
goto err_close_ctx;
return rc;
optee->smc.notif_irq = irq;
return 0;
err_close_ctx:
teedev_close_context(optee->notif.ctx);
optee->notif.ctx = NULL;
return rc;
}
static void optee_smc_notif_uninit_irq(struct optee *optee)
{
if (optee->notif.ctx) {
optee_smc_stop_async_notif(optee->notif.ctx);
if (optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_ASYNC_NOTIF) {
optee_smc_stop_async_notif(optee->ctx);
if (optee->smc.notif_irq) {
free_irq(optee->smc.notif_irq, optee);
irq_dispose_mapping(optee->smc.notif_irq);
}
/*
* The thread normally working with optee->notif.ctx was
* stopped with free_irq() above.
*
* Note we're not using teedev_close_context() or
* tee_client_close_context() since we have already called
* tee_device_put() while initializing to avoid a circular
* reference counting.
*/
teedev_close_context(optee->notif.ctx);
}
}
@ -1174,33 +1159,6 @@ static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
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)
{
@ -1214,10 +1172,7 @@ optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
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) {
@ -1235,11 +1190,6 @@ optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
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");
@ -1247,35 +1197,13 @@ optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
}
vaddr = (unsigned long)va;
rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
3 /* 8 bytes aligned */);
rc = tee_shm_pool_alloc_res_mem(vaddr, paddr, size,
OPTEE_MIN_STATIC_POOL_ALIGN);
if (IS_ERR(rc))
goto err_memunmap;
priv_mgr = rc;
memunmap(va);
else
*memremaped_shm = va;
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;
}
@ -1366,6 +1294,7 @@ static int optee_probe(struct platform_device *pdev)
struct optee *optee = NULL;
void *memremaped_shm = NULL;
struct tee_device *teedev;
struct tee_context *ctx;
u32 max_notif_value;
u32 sec_caps;
int rc;
@ -1396,7 +1325,7 @@ static int optee_probe(struct platform_device *pdev)
* Try to use dynamic shared memory if possible
*/
if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
pool = optee_config_dyn_shm();
pool = optee_shm_pool_alloc_pages();
/*
* If dynamic shared memory is not available or failed - try static one
@ -1446,9 +1375,13 @@ static int optee_probe(struct platform_device *pdev)
optee->pool = pool;
platform_set_drvdata(pdev, optee);
ctx = teedev_open(optee->teedev);
if (IS_ERR(ctx))
goto err_supp_uninit;
optee->ctx = ctx;
rc = optee_notif_init(optee, max_notif_value);
if (rc)
goto err_supp_uninit;
goto err_close_ctx;
if (sec_caps & OPTEE_SMC_SEC_CAP_ASYNC_NOTIF) {
unsigned int irq;
@ -1496,6 +1429,8 @@ static int optee_probe(struct platform_device *pdev)
optee_unregister_devices();
err_notif_uninit:
optee_notif_uninit(optee);
err_close_ctx:
teedev_close_context(ctx);
err_supp_uninit:
optee_supp_uninit(&optee->supp);
mutex_destroy(&optee->call_queue.mutex);

5
drivers/tee/tee_core.c
View file

@ -297,7 +297,7 @@ static int tee_ioctl_shm_alloc(struct tee_context *ctx,
if (data.flags)
return -EINVAL;
shm = tee_shm_alloc(ctx, data.size, TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
shm = tee_shm_alloc_user_buf(ctx, data.size);
if (IS_ERR(shm))
return PTR_ERR(shm);
@ -334,8 +334,7 @@ tee_ioctl_shm_register(struct tee_context *ctx,
if (data.flags)
return -EINVAL;
shm = tee_shm_register(ctx, data.addr, data.length,
TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED);
shm = tee_shm_register_user_buf(ctx, data.addr, data.length);
if (IS_ERR(shm))
return PTR_ERR(shm);

15
drivers/tee/tee_private.h
View file

@ -12,17 +12,6 @@
#include <linux/mutex.h>
#include <linux/types.h>
/**
* struct tee_shm_pool - shared memory pool
* @private_mgr: pool manager for shared memory only between kernel
* and secure world
* @dma_buf_mgr: pool manager for shared memory exported to user space
*/
struct tee_shm_pool {
struct tee_shm_pool_mgr *private_mgr;
struct tee_shm_pool_mgr *dma_buf_mgr;
};
#define TEE_DEVICE_FLAG_REGISTERED 0x1
#define TEE_MAX_DEV_NAME_LEN 32
@ -68,4 +57,8 @@ void tee_device_put(struct tee_device *teedev);
void teedev_ctx_get(struct tee_context *ctx);
void teedev_ctx_put(struct tee_context *ctx);
struct tee_shm *tee_shm_alloc_user_buf(struct tee_context *ctx, size_t size);
struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx,
unsigned long addr, size_t length);
#endif /*TEE_PRIVATE_H*/

322
drivers/tee/tee_shm.c
View file

@ -12,17 +12,43 @@
#include <linux/uio.h>
#include "tee_private.h"
static void shm_put_kernel_pages(struct page **pages, size_t page_count)
{
size_t n;
for (n = 0; n < page_count; n++)
put_page(pages[n]);
}
static int shm_get_kernel_pages(unsigned long start, size_t page_count,
struct page **pages)
{
struct kvec *kiov;
size_t n;
int rc;
kiov = kcalloc(page_count, sizeof(*kiov), GFP_KERNEL);
if (!kiov)
return -ENOMEM;
for (n = 0; n < page_count; n++) {
kiov[n].iov_base = (void *)(start + n * PAGE_SIZE);
kiov[n].iov_len = PAGE_SIZE;
}
rc = get_kernel_pages(kiov, page_count, 0, pages);
kfree(kiov);
return rc;
}
static void release_registered_pages(struct tee_shm *shm)
{
if (shm->pages) {
if (shm->flags & TEE_SHM_USER_MAPPED) {
if (shm->flags & TEE_SHM_USER_MAPPED)
unpin_user_pages(shm->pages, shm->num_pages);
} else {
size_t n;
for (n = 0; n < shm->num_pages; n++)
put_page(shm->pages[n]);
}
else
shm_put_kernel_pages(shm->pages, shm->num_pages);
kfree(shm->pages);
}
@ -31,15 +57,8 @@ static void release_registered_pages(struct tee_shm *shm)
static void tee_shm_release(struct tee_device *teedev, struct tee_shm *shm)
{
if (shm->flags & TEE_SHM_POOL) {
struct tee_shm_pool_mgr *poolm;
if (shm->flags & TEE_SHM_DMA_BUF)
poolm = teedev->pool->dma_buf_mgr;
else
poolm = teedev->pool->private_mgr;
poolm->ops->free(poolm, shm);
} else if (shm->flags & TEE_SHM_REGISTER) {
teedev->pool->ops->free(teedev->pool, shm);
} else if (shm->flags & TEE_SHM_DYNAMIC) {
int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
if (rc)
@ -56,25 +75,14 @@ static void tee_shm_release(struct tee_device *teedev, struct tee_shm *shm)
tee_device_put(teedev);
}
struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
static struct tee_shm *shm_alloc_helper(struct tee_context *ctx, size_t size,
size_t align, u32 flags, int id)
{
struct tee_device *teedev = ctx->teedev;
struct tee_shm_pool_mgr *poolm = NULL;
struct tee_shm *shm;
void *ret;
int rc;
if (!(flags & TEE_SHM_MAPPED)) {
dev_err(teedev->dev.parent,
"only mapped allocations supported\n");
return ERR_PTR(-EINVAL);
}
if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF | TEE_SHM_PRIV))) {
dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags);
return ERR_PTR(-EINVAL);
}
if (!tee_device_get(teedev))
return ERR_PTR(-EINVAL);
@ -91,41 +99,76 @@ struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
}
refcount_set(&shm->refcount, 1);
shm->flags = flags | TEE_SHM_POOL;
shm->ctx = ctx;
if (flags & TEE_SHM_DMA_BUF)
poolm = teedev->pool->dma_buf_mgr;
else
poolm = teedev->pool->private_mgr;
shm->flags = flags;
shm->id = id;
rc = poolm->ops->alloc(poolm, shm, size);
/*
* We're assigning this as it is needed if the shm is to be
* registered. If this function returns OK then the caller expected
* to call teedev_ctx_get() or clear shm->ctx in case it's not
* needed any longer.
*/
shm->ctx = ctx;
rc = teedev->pool->ops->alloc(teedev->pool, shm, size, align);
if (rc) {
ret = ERR_PTR(rc);
goto err_kfree;
}
if (flags & TEE_SHM_DMA_BUF) {
mutex_lock(&teedev->mutex);
shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
mutex_unlock(&teedev->mutex);
if (shm->id < 0) {
ret = ERR_PTR(shm->id);
goto err_pool_free;
}
}
teedev_ctx_get(ctx);
return shm;
err_pool_free:
poolm->ops->free(poolm, shm);
err_kfree:
kfree(shm);
err_dev_put:
tee_device_put(teedev);
return ret;
}
EXPORT_SYMBOL_GPL(tee_shm_alloc);
/**
* tee_shm_alloc_user_buf() - Allocate shared memory for user space
* @ctx: Context that allocates the shared memory
* @size: Requested size of shared memory
*
* Memory allocated as user space shared memory is automatically freed when
* the TEE file pointer is closed. The primary usage of this function is
* when the TEE driver doesn't support registering ordinary user space
* memory.
*
* @returns a pointer to 'struct tee_shm'
*/
struct tee_shm *tee_shm_alloc_user_buf(struct tee_context *ctx, size_t size)
{
u32 flags = TEE_SHM_DYNAMIC | TEE_SHM_POOL;
struct tee_device *teedev = ctx->teedev;
struct tee_shm *shm;
void *ret;
int id;
mutex_lock(&teedev->mutex);
id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL);
mutex_unlock(&teedev->mutex);
if (id < 0)
return ERR_PTR(id);
shm = shm_alloc_helper(ctx, size, PAGE_SIZE, flags, id);
if (IS_ERR(shm)) {
mutex_lock(&teedev->mutex);
idr_remove(&teedev->idr, id);
mutex_unlock(&teedev->mutex);
return shm;
}
mutex_lock(&teedev->mutex);
ret = idr_replace(&teedev->idr, shm, id);
mutex_unlock(&teedev->mutex);
if (IS_ERR(ret)) {
tee_shm_free(shm);
return ret;
}
return shm;
}
/**
* tee_shm_alloc_kernel_buf() - Allocate shared memory for kernel buffer
@ -141,32 +184,54 @@ EXPORT_SYMBOL_GPL(tee_shm_alloc);
*/
struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size)
{
return tee_shm_alloc(ctx, size, TEE_SHM_MAPPED);
u32 flags = TEE_SHM_DYNAMIC | TEE_SHM_POOL;
return shm_alloc_helper(ctx, size, PAGE_SIZE, flags, -1);
}
EXPORT_SYMBOL_GPL(tee_shm_alloc_kernel_buf);
struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
size_t length, u32 flags)
/**
* tee_shm_alloc_priv_buf() - Allocate shared memory for a privately shared
* kernel buffer
* @ctx: Context that allocates the shared memory
* @size: Requested size of shared memory
*
* This function returns similar shared memory as
* tee_shm_alloc_kernel_buf(), but with the difference that the memory
* might not be registered in secure world in case the driver supports
* passing memory not registered in advance.
*
* This function should normally only be used internally in the TEE
* drivers.
*
* @returns a pointer to 'struct tee_shm'
*/
struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size)
{
u32 flags = TEE_SHM_PRIV | TEE_SHM_POOL;
return shm_alloc_helper(ctx, size, sizeof(long) * 2, flags, -1);
}
EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf);
static struct tee_shm *
register_shm_helper(struct tee_context *ctx, unsigned long addr,
size_t length, u32 flags, int id)
{
struct tee_device *teedev = ctx->teedev;
const u32 req_user_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED;
const u32 req_kernel_flags = TEE_SHM_DMA_BUF | TEE_SHM_KERNEL_MAPPED;
struct tee_shm *shm;
unsigned long start;
size_t num_pages;
void *ret;
int rc;
int num_pages;
unsigned long start;
if (flags != req_user_flags && flags != req_kernel_flags)
return ERR_PTR(-ENOTSUPP);
if (!tee_device_get(teedev))
return ERR_PTR(-EINVAL);
if (!teedev->desc->ops->shm_register ||
!teedev->desc->ops->shm_unregister) {
tee_device_put(teedev);
return ERR_PTR(-ENOTSUPP);
ret = ERR_PTR(-ENOTSUPP);
goto err_dev_put;
}
teedev_ctx_get(ctx);
@ -174,13 +239,13 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
shm = kzalloc(sizeof(*shm), GFP_KERNEL);
if (!shm) {
ret = ERR_PTR(-ENOMEM);
goto err;
goto err_ctx_put;
}
refcount_set(&shm->refcount, 1);
shm->flags = flags | TEE_SHM_REGISTER;
shm->flags = flags;
shm->ctx = ctx;
shm->id = -1;
shm->id = id;
addr = untagged_addr(addr);
start = rounddown(addr, PAGE_SIZE);
shm->offset = addr - start;
@ -189,71 +254,106 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL);
if (!shm->pages) {
ret = ERR_PTR(-ENOMEM);
goto err;
goto err_free_shm;
}
if (flags & TEE_SHM_USER_MAPPED) {
if (flags & TEE_SHM_USER_MAPPED)
rc = pin_user_pages_fast(start, num_pages, FOLL_WRITE,
shm->pages);
} else {
struct kvec *kiov;
int i;
kiov = kcalloc(num_pages, sizeof(*kiov), GFP_KERNEL);
if (!kiov) {
ret = ERR_PTR(-ENOMEM);
goto err;
}
for (i = 0; i < num_pages; i++) {
kiov[i].iov_base = (void *)(start + i * PAGE_SIZE);
kiov[i].iov_len = PAGE_SIZE;
}
rc = get_kernel_pages(kiov, num_pages, 0, shm->pages);
kfree(kiov);
}
else
rc = shm_get_kernel_pages(start, num_pages, shm->pages);
if (rc > 0)
shm->num_pages = rc;
if (rc != num_pages) {
if (rc >= 0)
rc = -ENOMEM;
ret = ERR_PTR(rc);
goto err;
}
mutex_lock(&teedev->mutex);
shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
mutex_unlock(&teedev->mutex);
if (shm->id < 0) {
ret = ERR_PTR(shm->id);
goto err;
goto err_put_shm_pages;
}
rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages,
shm->num_pages, start);
if (rc) {
ret = ERR_PTR(rc);
goto err;
goto err_put_shm_pages;
}
return shm;
err:
if (shm) {
if (shm->id >= 0) {
mutex_lock(&teedev->mutex);
idr_remove(&teedev->idr, shm->id);
mutex_unlock(&teedev->mutex);
}
release_registered_pages(shm);
}
err_put_shm_pages:
if (flags & TEE_SHM_USER_MAPPED)
unpin_user_pages(shm->pages, shm->num_pages);
else
shm_put_kernel_pages(shm->pages, shm->num_pages);
kfree(shm->pages);
err_free_shm:
kfree(shm);
err_ctx_put:
teedev_ctx_put(ctx);
err_dev_put:
tee_device_put(teedev);
return ret;
}
EXPORT_SYMBOL_GPL(tee_shm_register);
/**
* tee_shm_register_user_buf() - Register a userspace shared memory buffer
* @ctx: Context that registers the shared memory
* @addr: The userspace address of the shared buffer
* @length: Length of the shared buffer
*
* @returns a pointer to 'struct tee_shm'
*/
struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx,
unsigned long addr, size_t length)
{
u32 flags = TEE_SHM_USER_MAPPED | TEE_SHM_DYNAMIC;
struct tee_device *teedev = ctx->teedev;
struct tee_shm *shm;
void *ret;
int id;
mutex_lock(&teedev->mutex);
id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL);
mutex_unlock(&teedev->mutex);
if (id < 0)
return ERR_PTR(id);
shm = register_shm_helper(ctx, addr, length, flags, id);
if (IS_ERR(shm)) {
mutex_lock(&teedev->mutex);
idr_remove(&teedev->idr, id);
mutex_unlock(&teedev->mutex);
return shm;
}
mutex_lock(&teedev->mutex);
ret = idr_replace(&teedev->idr, shm, id);
mutex_unlock(&teedev->mutex);
if (IS_ERR(ret)) {
tee_shm_free(shm);
return ret;
}
return shm;
}
/**
* tee_shm_register_kernel_buf() - Register kernel memory to be shared with
* secure world
* @ctx: Context that registers the shared memory
* @addr: The buffer
* @length: Length of the buffer
*
* @returns a pointer to 'struct tee_shm'
*/
struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx,
void *addr, size_t length)
{
u32 flags = TEE_SHM_DYNAMIC;
return register_shm_helper(ctx, (unsigned long)addr, length, flags, -1);
}
EXPORT_SYMBOL_GPL(tee_shm_register_kernel_buf);
static int tee_shm_fop_release(struct inode *inode, struct file *filp)
{
@ -293,7 +393,7 @@ int tee_shm_get_fd(struct tee_shm *shm)
{
int fd;
if (!(shm->flags & TEE_SHM_DMA_BUF))
if (shm->id < 0)
return -EINVAL;
/* matched by tee_shm_put() in tee_shm_op_release() */
@ -323,7 +423,7 @@ EXPORT_SYMBOL_GPL(tee_shm_free);
*/
int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa)
{
if (!(shm->flags & TEE_SHM_MAPPED))
if (!shm->kaddr)
return -EINVAL;
/* Check that we're in the range of the shm */
if ((char *)va < (char *)shm->kaddr)
@ -345,7 +445,7 @@ EXPORT_SYMBOL_GPL(tee_shm_va2pa);
*/
int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va)
{
if (!(shm->flags & TEE_SHM_MAPPED))
if (!shm->kaddr)
return -EINVAL;
/* Check that we're in the range of the shm */
if (pa < shm->paddr)
@ -373,7 +473,7 @@ EXPORT_SYMBOL_GPL(tee_shm_pa2va);
*/
void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
{
if (!(shm->flags & TEE_SHM_MAPPED))
if (!shm->kaddr)
return ERR_PTR(-EINVAL);
if (offs >= shm->size)
return ERR_PTR(-EINVAL);
@ -448,7 +548,7 @@ void tee_shm_put(struct tee_shm *shm)
* the refcount_inc() in tee_shm_get_from_id() never starts
* from 0.
*/
if (shm->flags & TEE_SHM_DMA_BUF)
if (shm->id >= 0)
idr_remove(&teedev->idr, shm->id);
do_release = true;
}

176
drivers/tee/tee_shm_pool.c
View file

@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015, Linaro Limited
* Copyright (c) 2015, 2017, 2022 Linaro Limited
*/
#include <linux/device.h>
#include <linux/dma-buf.h>
@ -9,14 +9,16 @@
#include <linux/tee_drv.h>
#include "tee_private.h"
static int pool_op_gen_alloc(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm, size_t size)
static int pool_op_gen_alloc(struct tee_shm_pool *pool, struct tee_shm *shm,
size_t size, size_t align)
{
unsigned long va;
struct gen_pool *genpool = poolm->private_data;
size_t s = roundup(size, 1 << genpool->min_alloc_order);
struct gen_pool *genpool = pool->private_data;
size_t a = max_t(size_t, align, BIT(genpool->min_alloc_order));
struct genpool_data_align data = { .align = a };
size_t s = roundup(size, a);
va = gen_pool_alloc(genpool, s);
va = gen_pool_alloc_algo(genpool, s, gen_pool_first_fit_align, &data);
if (!va)
return -ENOMEM;
@ -24,163 +26,67 @@ static int pool_op_gen_alloc(struct tee_shm_pool_mgr *poolm,
shm->kaddr = (void *)va;
shm->paddr = gen_pool_virt_to_phys(genpool, va);
shm->size = s;
/*
* This is from a static shared memory pool so no need to register
* each chunk, and no need to unregister later either.
*/
shm->flags &= ~TEE_SHM_DYNAMIC;
return 0;
}
static void pool_op_gen_free(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm)
static void pool_op_gen_free(struct tee_shm_pool *pool, struct tee_shm *shm)
{
gen_pool_free(poolm->private_data, (unsigned long)shm->kaddr,
gen_pool_free(pool->private_data, (unsigned long)shm->kaddr,
shm->size);
shm->kaddr = NULL;
}
static void pool_op_gen_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
static void pool_op_gen_destroy_pool(struct tee_shm_pool *pool)
{
gen_pool_destroy(poolm->private_data);
kfree(poolm);
gen_pool_destroy(pool->private_data);
kfree(pool);
}
static const struct tee_shm_pool_mgr_ops pool_ops_generic = {
static const struct tee_shm_pool_ops pool_ops_generic = {
.alloc = pool_op_gen_alloc,
.free = pool_op_gen_free,
.destroy_poolmgr = pool_op_gen_destroy_poolmgr,
.destroy_pool = pool_op_gen_destroy_pool,
};
/**
* tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved
* memory range
* @priv_info: Information for driver private shared memory pool
* @dmabuf_info: Information for dma-buf shared memory pool
*
* Start and end of pools will must be page aligned.
*
* Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
* in @dmabuf, others will use the range provided by @priv.
*
* @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
*/
struct tee_shm_pool *
tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info,
struct tee_shm_pool_mem_info *dmabuf_info)
{
struct tee_shm_pool_mgr *priv_mgr;
struct tee_shm_pool_mgr *dmabuf_mgr;
void *rc;
/*
* Create the pool for driver private shared memory
*/
rc = tee_shm_pool_mgr_alloc_res_mem(priv_info->vaddr, priv_info->paddr,
priv_info->size,
3 /* 8 byte aligned */);
if (IS_ERR(rc))
return rc;
priv_mgr = rc;
/*
* Create the pool for dma_buf shared memory
*/
rc = tee_shm_pool_mgr_alloc_res_mem(dmabuf_info->vaddr,
dmabuf_info->paddr,
dmabuf_info->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;
return rc;
err_free_dmabuf_mgr:
tee_shm_pool_mgr_destroy(dmabuf_mgr);
err_free_priv_mgr:
tee_shm_pool_mgr_destroy(priv_mgr);
return rc;
}
EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
struct tee_shm_pool_mgr *tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr,
phys_addr_t paddr,
size_t size,
int min_alloc_order)
struct tee_shm_pool *tee_shm_pool_alloc_res_mem(unsigned long vaddr,
phys_addr_t paddr, size_t size,
int min_alloc_order)
{
const size_t page_mask = PAGE_SIZE - 1;
struct tee_shm_pool_mgr *mgr;
struct tee_shm_pool *pool;
int rc;
/* Start and end must be page aligned */
if (vaddr & page_mask || paddr & page_mask || size & page_mask)
return ERR_PTR(-EINVAL);
mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
if (!mgr)
return ERR_PTR(-ENOMEM);
mgr->private_data = gen_pool_create(min_alloc_order, -1);
if (!mgr->private_data) {
rc = -ENOMEM;
goto err;
}
gen_pool_set_algo(mgr->private_data, gen_pool_best_fit, NULL);
rc = gen_pool_add_virt(mgr->private_data, vaddr, paddr, size, -1);
if (rc) {
gen_pool_destroy(mgr->private_data);
goto err;
}
mgr->ops = &pool_ops_generic;
return mgr;
err:
kfree(mgr);
return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(tee_shm_pool_mgr_alloc_res_mem);
static bool check_mgr_ops(struct tee_shm_pool_mgr *mgr)
{
return mgr && mgr->ops && mgr->ops->alloc && mgr->ops->free &&
mgr->ops->destroy_poolmgr;
}
struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr,
struct tee_shm_pool_mgr *dmabuf_mgr)
{
struct tee_shm_pool *pool;
if (!check_mgr_ops(priv_mgr) || !check_mgr_ops(dmabuf_mgr))
return ERR_PTR(-EINVAL);
pool = kzalloc(sizeof(*pool), GFP_KERNEL);
if (!pool)
return ERR_PTR(-ENOMEM);
pool->private_mgr = priv_mgr;
pool->dma_buf_mgr = dmabuf_mgr;
pool->private_data = gen_pool_create(min_alloc_order, -1);
if (!pool->private_data) {
rc = -ENOMEM;
goto err;
}
rc = gen_pool_add_virt(pool->private_data, vaddr, paddr, size, -1);
if (rc) {
gen_pool_destroy(pool->private_data);
goto err;
}
pool->ops = &pool_ops_generic;
return pool;
}
EXPORT_SYMBOL_GPL(tee_shm_pool_alloc);
/**
* tee_shm_pool_free() - Free a shared memory pool
* @pool: The shared memory pool to free
*
* There must be no remaining shared memory allocated from this pool when
* this function is called.
*/
void tee_shm_pool_free(struct tee_shm_pool *pool)
{
if (pool->private_mgr)
tee_shm_pool_mgr_destroy(pool->private_mgr);
if (pool->dma_buf_mgr)
tee_shm_pool_mgr_destroy(pool->dma_buf_mgr);
err:
kfree(pool);
return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(tee_shm_pool_free);
EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);

138
include/linux/tee_drv.h
View file

@ -1,6 +1,6 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2015-2016, Linaro Limited
* Copyright (c) 2015-2022 Linaro Limited
*/
#ifndef __TEE_DRV_H
@ -20,14 +20,11 @@
* specific TEE driver.
*/
#define TEE_SHM_MAPPED BIT(0) /* Memory mapped by the kernel */
#define TEE_SHM_DMA_BUF BIT(1) /* Memory with dma-buf handle */
#define TEE_SHM_EXT_DMA_BUF BIT(2) /* Memory with dma-buf handle */
#define TEE_SHM_REGISTER BIT(3) /* Memory registered in secure world */
#define TEE_SHM_USER_MAPPED BIT(4) /* Memory mapped in user space */
#define TEE_SHM_POOL BIT(5) /* Memory allocated from pool */
#define TEE_SHM_KERNEL_MAPPED BIT(6) /* Memory mapped in kernel space */
#define TEE_SHM_PRIV BIT(7) /* Memory private to TEE driver */
#define TEE_SHM_DYNAMIC BIT(0) /* Dynamic shared memory registered */
/* in secure world */
#define TEE_SHM_USER_MAPPED BIT(1) /* Memory mapped in user space */
#define TEE_SHM_POOL BIT(2) /* Memory allocated from pool */
#define TEE_SHM_PRIV BIT(3) /* Memory private to TEE driver */
struct device;
struct tee_device;
@ -221,92 +218,39 @@ struct tee_shm {
};
/**
* struct tee_shm_pool_mgr - shared memory manager
* struct tee_shm_pool - shared memory pool
* @ops: operations
* @private_data: private data for the shared memory manager
*/
struct tee_shm_pool_mgr {
const struct tee_shm_pool_mgr_ops *ops;
struct tee_shm_pool {
const struct tee_shm_pool_ops *ops;
void *private_data;
};
/**
* struct tee_shm_pool_mgr_ops - shared memory pool manager operations
* struct tee_shm_pool_ops - shared memory pool operations
* @alloc: called when allocating shared memory
* @free: called when freeing shared memory
* @destroy_poolmgr: called when destroying the pool manager
* @destroy_pool: called when destroying the pool
*/
struct tee_shm_pool_mgr_ops {
int (*alloc)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm,
size_t size);
void (*free)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm);
void (*destroy_poolmgr)(struct tee_shm_pool_mgr *poolmgr);
struct tee_shm_pool_ops {
int (*alloc)(struct tee_shm_pool *pool, struct tee_shm *shm,
size_t size, size_t align);
void (*free)(struct tee_shm_pool *pool, struct tee_shm *shm);
void (*destroy_pool)(struct tee_shm_pool *pool);
};
/**
* tee_shm_pool_alloc() - Create a shared memory pool from shm managers
* @priv_mgr: manager for driver private shared memory allocations
* @dmabuf_mgr: manager for dma-buf shared memory allocations
*
* Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
* in @dmabuf, others will use the range provided by @priv.
*
* @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
*/
struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr,
struct tee_shm_pool_mgr *dmabuf_mgr);
/*
* tee_shm_pool_mgr_alloc_res_mem() - Create a shm manager for reserved
* memory
* tee_shm_pool_alloc_res_mem() - Create a shm manager for reserved memory
* @vaddr: Virtual address of start of pool
* @paddr: Physical address of start of pool
* @size: Size in bytes of the pool
*
* @returns pointer to a 'struct tee_shm_pool_mgr' or an ERR_PTR on failure.
*/
struct tee_shm_pool_mgr *tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr,
phys_addr_t paddr,
size_t size,
int min_alloc_order);
/**
* tee_shm_pool_mgr_destroy() - Free a shared memory manager
*/
static inline void tee_shm_pool_mgr_destroy(struct tee_shm_pool_mgr *poolm)
{
poolm->ops->destroy_poolmgr(poolm);
}
/**
* struct tee_shm_pool_mem_info - holds information needed to create a shared
* memory pool
* @vaddr: Virtual address of start of pool
* @paddr: Physical address of start of pool
* @size: Size in bytes of the pool
*/
struct tee_shm_pool_mem_info {
unsigned long vaddr;
phys_addr_t paddr;
size_t size;
};
/**
* tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved
* memory range
* @priv_info: Information for driver private shared memory pool
* @dmabuf_info: Information for dma-buf shared memory pool
*
* Start and end of pools will must be page aligned.
*
* Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
* in @dmabuf, others will use the range provided by @priv.
*
* @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
*/
struct tee_shm_pool *
tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info,
struct tee_shm_pool_mem_info *dmabuf_info);
struct tee_shm_pool *tee_shm_pool_alloc_res_mem(unsigned long vaddr,
phys_addr_t paddr, size_t size,
int min_alloc_order);
/**
* tee_shm_pool_free() - Free a shared memory pool
@ -315,7 +259,10 @@ tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info,
* The must be no remaining shared memory allocated from this pool when
* this function is called.
*/
void tee_shm_pool_free(struct tee_shm_pool *pool);
static inline void tee_shm_pool_free(struct tee_shm_pool *pool)
{
pool->ops->destroy_pool(pool);
}
/**
* tee_get_drvdata() - Return driver_data pointer
@ -323,43 +270,20 @@ void tee_shm_pool_free(struct tee_shm_pool *pool);
*/
void *tee_get_drvdata(struct tee_device *teedev);
/**
* tee_shm_alloc() - Allocate shared memory
* @ctx: Context that allocates the shared memory
* @size: Requested size of shared memory
* @flags: Flags setting properties for the requested shared memory.
*
* Memory allocated as global shared memory is automatically freed when the
* TEE file pointer is closed. The @flags field uses the bits defined by
* TEE_SHM_* above. TEE_SHM_MAPPED must currently always be set. If
* TEE_SHM_DMA_BUF global shared memory will be allocated and associated
* with a dma-buf handle, else driver private memory.
*
* @returns a pointer to 'struct tee_shm'
*/
struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags);
struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size);
struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size);
/**
* tee_shm_register() - Register shared memory buffer
* @ctx: Context that registers the shared memory
* @addr: Address is userspace of the shared buffer
* @length: Length of the shared buffer
* @flags: Flags setting properties for the requested shared memory.
*
* @returns a pointer to 'struct tee_shm'
*/
struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
size_t length, u32 flags);
struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx,
void *addr, size_t length);
/**
* tee_shm_is_registered() - Check if shared memory object in registered in TEE
* tee_shm_is_dynamic() - Check if shared memory object is of the dynamic kind
* @shm: Shared memory handle
* @returns true if object is registered in TEE
* @returns true if object is dynamic shared memory
*/
static inline bool tee_shm_is_registered(struct tee_shm *shm)
static inline bool tee_shm_is_dynamic(struct tee_shm *shm)
{
return shm && (shm->flags & TEE_SHM_REGISTER);
return shm && (shm->flags & TEE_SHM_DYNAMIC);
}
/**

23
security/keys/trusted-keys/trusted_tee.c
View file

@ -70,17 +70,15 @@ static int trusted_tee_seal(struct trusted_key_payload *p, char *datablob)
memset(&inv_arg, 0, sizeof(inv_arg));
memset(&param, 0, sizeof(param));
reg_shm_in = tee_shm_register(pvt_data.ctx, (unsigned long)p->key,
p->key_len, TEE_SHM_DMA_BUF |
TEE_SHM_KERNEL_MAPPED);
reg_shm_in = tee_shm_register_kernel_buf(pvt_data.ctx, p->key,
p->key_len);
if (IS_ERR(reg_shm_in)) {
dev_err(pvt_data.dev, "key shm register failed\n");
return PTR_ERR(reg_shm_in);
}
reg_shm_out = tee_shm_register(pvt_data.ctx, (unsigned long)p->blob,
sizeof(p->blob), TEE_SHM_DMA_BUF |
TEE_SHM_KERNEL_MAPPED);
reg_shm_out = tee_shm_register_kernel_buf(pvt_data.ctx, p->blob,
sizeof(p->blob));
if (IS_ERR(reg_shm_out)) {
dev_err(pvt_data.dev, "blob shm register failed\n");
ret = PTR_ERR(reg_shm_out);
@ -131,17 +129,15 @@ static int trusted_tee_unseal(struct trusted_key_payload *p, char *datablob)
memset(&inv_arg, 0, sizeof(inv_arg));
memset(&param, 0, sizeof(param));
reg_shm_in = tee_shm_register(pvt_data.ctx, (unsigned long)p->blob,
p->blob_len, TEE_SHM_DMA_BUF |
TEE_SHM_KERNEL_MAPPED);
reg_shm_in = tee_shm_register_kernel_buf(pvt_data.ctx, p->blob,
p->blob_len);
if (IS_ERR(reg_shm_in)) {
dev_err(pvt_data.dev, "blob shm register failed\n");
return PTR_ERR(reg_shm_in);
}
reg_shm_out = tee_shm_register(pvt_data.ctx, (unsigned long)p->key,
sizeof(p->key), TEE_SHM_DMA_BUF |
TEE_SHM_KERNEL_MAPPED);
reg_shm_out = tee_shm_register_kernel_buf(pvt_data.ctx, p->key,
sizeof(p->key));
if (IS_ERR(reg_shm_out)) {
dev_err(pvt_data.dev, "key shm register failed\n");
ret = PTR_ERR(reg_shm_out);
@ -192,8 +188,7 @@ static int trusted_tee_get_random(unsigned char *key, size_t key_len)
memset(&inv_arg, 0, sizeof(inv_arg));
memset(&param, 0, sizeof(param));
reg_shm = tee_shm_register(pvt_data.ctx, (unsigned long)key, key_len,
TEE_SHM_DMA_BUF | TEE_SHM_KERNEL_MAPPED);
reg_shm = tee_shm_register_kernel_buf(pvt_data.ctx, key, key_len);
if (IS_ERR(reg_shm)) {
dev_err(pvt_data.dev, "key shm register failed\n");
return PTR_ERR(reg_shm);