Add support in the OP-TEE backend driver for restricted memory
allocation. The support is limited to only the SMC ABI and for secure
video buffers.
OP-TEE is probed for the range of restricted physical memory and a
memory pool allocator is initialized if OP-TEE have support for such
memory.
Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
---
drivers/tee/optee/core.c | 21 +++++++++++++++
drivers/tee/optee/optee_private.h | 6 +++++
drivers/tee/optee/optee_smc.h | 35 ++++++++++++++++++++++++
drivers/tee/optee/smc_abi.c | 45 ++++++++++++++++++++++++++++---
4 files changed, 104 insertions(+), 3 deletions(-)
diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index 39e688d4e974..b6d5cbc6728d 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -95,6 +95,25 @@ void optee_release_supp(struct tee_context *ctx)
optee_supp_release(&optee->supp);
}
+int optee_rstmem_alloc(struct tee_context *ctx, struct tee_shm *shm,
+ u32 flags, size_t size)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+
+ if (!optee->sdp_pool)
+ return -EINVAL;
+ if (flags != TEE_IOC_FLAG_SECURE_VIDEO)
+ return -EINVAL;
+ return optee->sdp_pool->ops->alloc(optee->sdp_pool, shm, size, 0);
+}
+
+void optee_rstmem_free(struct tee_context *ctx, struct tee_shm *shm)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+
+ optee->sdp_pool->ops->free(optee->sdp_pool, shm);
+}
+
void optee_remove_common(struct optee *optee)
{
/* Unregister OP-TEE specific client devices on TEE bus */
@@ -111,6 +130,8 @@ void optee_remove_common(struct optee *optee)
tee_device_unregister(optee->teedev);
tee_shm_pool_free(optee->pool);
+ if (optee->sdp_pool)
+ optee->sdp_pool->ops->destroy_pool(optee->sdp_pool);
optee_supp_uninit(&optee->supp);
mutex_destroy(&optee->call_queue.mutex);
}
diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
index 424898cdc4e9..1f6b2cc992a9 100644
--- a/drivers/tee/optee/optee_private.h
+++ b/drivers/tee/optee/optee_private.h
@@ -200,6 +200,7 @@ struct optee_ops {
* @notif: notification synchronization struct
* @supp: supplicant synchronization struct for RPC to supplicant
* @pool: shared memory pool
+ * @sdp_pool: restricted memory pool for secure data path
* @rpc_param_count: If > 0 number of RPC parameters to make room for
* @scan_bus_done flag if device registation was already done.
* @scan_bus_work workq to scan optee bus and register optee drivers
@@ -218,6 +219,7 @@ struct optee {
struct optee_notif notif;
struct optee_supp supp;
struct tee_shm_pool *pool;
+ struct tee_shm_pool *sdp_pool;
unsigned int rpc_param_count;
bool scan_bus_done;
struct work_struct scan_bus_work;
@@ -340,6 +342,10 @@ void optee_rpc_cmd(struct tee_context *ctx, struct optee *optee,
int optee_do_bottom_half(struct tee_context *ctx);
int optee_stop_async_notif(struct tee_context *ctx);
+int optee_rstmem_alloc(struct tee_context *ctx, struct tee_shm *shm,
+ u32 flags, size_t size);
+void optee_rstmem_free(struct tee_context *ctx, struct tee_shm *shm);
+
/*
* Small helpers
*/
diff --git a/drivers/tee/optee/optee_smc.h b/drivers/tee/optee/optee_smc.h
index 7d9fa426505b..c3b8a1c204af 100644
--- a/drivers/tee/optee/optee_smc.h
+++ b/drivers/tee/optee/optee_smc.h
@@ -234,6 +234,39 @@ struct optee_smc_get_shm_config_result {
unsigned long settings;
};
+/*
+ * Get Secure Data Path memory config
+ *
+ * Returns the Secure Data Path memory config.
+ *
+ * Call register usage:
+ * a0 SMC Function ID, OPTEE_SMC_GET_SDP_CONFIG
+ * a2-6 Not used, must be zero
+ * a7 Hypervisor Client ID register
+ *
+ * Have config return register usage:
+ * a0 OPTEE_SMC_RETURN_OK
+ * a1 Physical address of start of SDP memory
+ * a2 Size of SDP memory
+ * a3 Not used
+ * a4-7 Preserved
+ *
+ * Not available register usage:
+ * a0 OPTEE_SMC_RETURN_ENOTAVAIL
+ * a1-3 Not used
+ * a4-7 Preserved
+ */
+#define OPTEE_SMC_FUNCID_GET_SDP_CONFIG 20
+#define OPTEE_SMC_GET_SDP_CONFIG \
+ OPTEE_SMC_FAST_CALL_VAL(OPTEE_SMC_FUNCID_GET_SDP_CONFIG)
+
+struct optee_smc_get_sdp_config_result {
+ unsigned long status;
+ unsigned long start;
+ unsigned long size;
+ unsigned long flags;
+};
+
/*
* Exchanges capabilities between normal world and secure world
*
@@ -278,6 +311,8 @@ struct optee_smc_get_shm_config_result {
#define OPTEE_SMC_SEC_CAP_ASYNC_NOTIF BIT(5)
/* Secure world supports pre-allocating RPC arg struct */
#define OPTEE_SMC_SEC_CAP_RPC_ARG BIT(6)
+/* Secure world supports Secure Data Path */
+#define OPTEE_SMC_SEC_CAP_SDP BIT(7)
#define OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES 9
#define OPTEE_SMC_EXCHANGE_CAPABILITIES \
diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
index 844285d4f03c..05068c70c791 100644
--- a/drivers/tee/optee/smc_abi.c
+++ b/drivers/tee/optee/smc_abi.c
@@ -1164,6 +1164,8 @@ static void optee_get_version(struct tee_device *teedev,
v.gen_caps |= TEE_GEN_CAP_REG_MEM;
if (optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_MEMREF_NULL)
v.gen_caps |= TEE_GEN_CAP_MEMREF_NULL;
+ if (optee->sdp_pool)
+ v.gen_caps |= TEE_GEN_CAP_RSTMEM;
*vers = v;
}
@@ -1186,6 +1188,8 @@ static const struct tee_driver_ops optee_clnt_ops = {
.cancel_req = optee_cancel_req,
.shm_register = optee_shm_register,
.shm_unregister = optee_shm_unregister,
+ .rstmem_alloc = optee_rstmem_alloc,
+ .rstmem_free = optee_rstmem_free,
};
static const struct tee_desc optee_clnt_desc = {
@@ -1202,6 +1206,8 @@ static const struct tee_driver_ops optee_supp_ops = {
.supp_send = optee_supp_send,
.shm_register = optee_shm_register_supp,
.shm_unregister = optee_shm_unregister_supp,
+ .rstmem_alloc = optee_rstmem_alloc,
+ .rstmem_free = optee_rstmem_free,
};
static const struct tee_desc optee_supp_desc = {
@@ -1582,6 +1588,32 @@ static inline int optee_load_fw(struct platform_device *pdev,
}
#endif
+static int optee_sdp_pool_init(struct optee *optee)
+{
+ struct tee_shm_pool *pool;
+ union {
+ struct arm_smccc_res smccc;
+ struct optee_smc_get_sdp_config_result result;
+ } res;
+
+ if (!(optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_SDP))
+ return 0;
+
+ optee->smc.invoke_fn(OPTEE_SMC_GET_SDP_CONFIG, 0, 0, 0, 0, 0, 0, 0,
+ &res.smccc);
+ if (res.result.status != OPTEE_SMC_RETURN_OK) {
+ pr_err("Secure Data Path service not available\n");
+ return 0;
+ }
+
+ pool = tee_rstmem_gen_pool_alloc(res.result.start, res.result.size);
+ if (IS_ERR(pool))
+ return PTR_ERR(pool);
+ optee->sdp_pool = pool;
+
+ return 0;
+}
+
static int optee_probe(struct platform_device *pdev)
{
optee_invoke_fn *invoke_fn;
@@ -1677,7 +1709,7 @@ static int optee_probe(struct platform_device *pdev)
optee = kzalloc(sizeof(*optee), GFP_KERNEL);
if (!optee) {
rc = -ENOMEM;
- goto err_free_pool;
+ goto err_free_shm_pool;
}
optee->ops = &optee_ops;
@@ -1685,10 +1717,14 @@ static int optee_probe(struct platform_device *pdev)
optee->smc.sec_caps = sec_caps;
optee->rpc_param_count = rpc_param_count;
+ rc = optee_sdp_pool_init(optee);
+ if (rc)
+ goto err_free_optee;
+
teedev = tee_device_alloc(&optee_clnt_desc, NULL, pool, optee);
if (IS_ERR(teedev)) {
rc = PTR_ERR(teedev);
- goto err_free_optee;
+ goto err_sdp_pool_uninit;
}
optee->teedev = teedev;
@@ -1786,9 +1822,12 @@ static int optee_probe(struct platform_device *pdev)
tee_device_unregister(optee->supp_teedev);
err_unreg_teedev:
tee_device_unregister(optee->teedev);
+err_sdp_pool_uninit:
+ if (optee->sdp_pool)
+ optee->sdp_pool->ops->destroy_pool(optee->sdp_pool);
err_free_optee:
kfree(optee);
-err_free_pool:
+err_free_shm_pool:
tee_shm_pool_free(pool);
if (memremaped_shm)
memunmap(memremaped_shm);
--
2.43.0
