[PATCH v2 0/5] Add FF-A support in OP-TEE driver

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Re: [PATCH v2 0/7] Asynchronous...

OP-TEE SKS

Jens Wiklander

27 May 2021 27 May '21

9:13 a.m.

Hi all,

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

These patches are based on the FF-A v7 patch set by Sudeep Holla [2] [3].

There is one change to the TEE subsystem with "tee: add sec_world_id to struct tee_shm" to add support for holding globally unique handle assigned by the FF-A. This is a field that I believe could useful for the AMDTEE driver too.

For communication the OP-TEE message protocol is still used, but with a new type of memory reference, struct optee_msg_param_fmem, to carry the information needed by FF-A. The OP-TEE driver is refactored internally with to sets of callbacks, one for the old SMC based communication and another set with FF-A as transport.

There is also a difference in how the drivers are instantiated. With the SMC based transport we have a platform driver, module_platform_driver(), today which we're keeping as is for this configuration. In a FF-A system we have a FF-A driver, module_ffa_driver(), instead.

The OP-TEE driver can be compiled for both targets at the same time and it's up to runtime configuration (device tree or ACPI) to decide how it's initialized.

Thanks, Jens

[1] https://developer.arm.com/documentation/den0077/latest [2] https://lore.kernel.org/linux-arm-kernel/20210521151033.181846-1-sudeep.holl... [3] git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git v5.13/ffa

v1->v2: - Rebased to the FF-A v7 patch - Fixed a couple of reports from kernel test robot lkp@intel.com

Jens Wiklander (5): tee: add sec_world_id to struct tee_shm optee: simplify optee_release() optee: refactor driver with internal callbacks optee: add a FF-A memory pool optee: add FF-A support

drivers/tee/optee/call.c | 325 +++++++++++--- drivers/tee/optee/core.c | 689 ++++++++++++++++++++++++++---- drivers/tee/optee/optee_ffa.h | 153 +++++++ drivers/tee/optee/optee_msg.h | 27 +- drivers/tee/optee/optee_private.h | 88 +++- drivers/tee/optee/rpc.c | 137 +++++- drivers/tee/optee/shm_pool.c | 65 ++- drivers/tee/optee/shm_pool.h | 1 + include/linux/tee_drv.h | 7 +- 9 files changed, 1326 insertions(+), 166 deletions(-) create mode 100644 drivers/tee/optee/optee_ffa.h

-- 2.25.1

Show replies by date

Jens Wiklander

27 May 27 May

9:14 a.m.

New subject: [PATCH v2 1/5] tee: add sec_world_id to struct tee_shm

Adds sec_world_id to struct tee_shm which describes a shared memory object. sec_world_id can be used by a driver to store an id assigned by secure world.

Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- include/linux/tee_drv.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index 54269e47ac9a..1a29f0e66e13 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -196,7 +196,11 @@ 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. @@ -212,6 +216,7 @@ struct tee_shm { struct dma_buf *dmabuf; u32 flags; int id; + u64 sec_world_id; };

/**

-- 2.25.1

Jens Wiklander

9:14 a.m.

New subject: [PATCH v2 2/5] optee: simplify optee_release()

Simplifies optee_release() with a new helper function, optee_close_session_helper() which has been factored out from optee_close_session().

A separate optee_release_supp() is added for the supplicant device.

Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/optee/call.c | 31 ++++++++++------- drivers/tee/optee/core.c | 55 +++++++++++-------------------- drivers/tee/optee/optee_private.h | 1 + 3 files changed, 39 insertions(+), 48 deletions(-)

diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c index 6132cc8d014c..20092cf95c31 100644 --- a/drivers/tee/optee/call.c +++ b/drivers/tee/optee/call.c @@ -286,12 +286,28 @@ int optee_open_session(struct tee_context *ctx, return rc; }

-int optee_close_session(struct tee_context *ctx, u32 session) +int optee_close_session_helper(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; + + 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; +} + +int optee_close_session(struct tee_context *ctx, u32 session) +{ + struct optee_context_data *ctxdata = ctx->data; struct optee_session *sess;

/* Check that the session is valid and remove it from the list */ @@ -304,16 +320,7 @@ 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, diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c index ddb8f9ecf307..949223b214c3 100644 --- a/drivers/tee/optee/core.c +++ b/drivers/tee/optee/core.c @@ -263,59 +263,42 @@ static int optee_open(struct tee_context *ctx) 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); - 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); + ctx->data = NULL; +}

- if (!IS_ERR(shm)) - tee_shm_free(shm); +static void optee_release(struct tee_context *ctx) +{ + optee_release_helper(ctx, optee_close_session_helper); +}

- ctx->data = NULL; +static void optee_release_supp(struct tee_context *ctx) +{ + struct optee *optee = tee_get_drvdata(ctx->teedev);

- 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); + 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 = { @@ -339,7 +322,7 @@ static const struct tee_desc optee_desc = { static const struct tee_driver_ops optee_supp_ops = { .get_version = optee_get_version, .open = optee_open, - .release = optee_release, + .release = optee_release_supp, .supp_recv = optee_supp_recv, .supp_send = optee_supp_send, .shm_register = optee_shm_register_supp, diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h index e25b216a14ef..2b63b796645e 100644 --- a/drivers/tee/optee/optee_private.h +++ b/drivers/tee/optee/optee_private.h @@ -152,6 +152,7 @@ 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);

-- 2.25.1

Jens Wiklander

9:14 a.m.

New subject: [PATCH v2 3/5] optee: refactor driver with internal callbacks

The OP-TEE driver is refactored with three internal callbacks replacing direct calls to optee_from_msg_param(), optee_to_msg_param() and optee_do_call_with_arg().

These functions a central to communicating with OP-TEE in secure world by using the SMC Calling Convention directly.

This refactoring makes room for using other primitives to communicate with OP-TEE in secure world while being able to reuse as much as possible from the present driver.

Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/optee/call.c | 86 +++++++++-------- drivers/tee/optee/core.c | 148 ++++++++++++++++++++---------- drivers/tee/optee/optee_private.h | 35 +++++-- drivers/tee/optee/rpc.c | 19 ++-- 4 files changed, 182 insertions(+), 106 deletions(-)

diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c index 20092cf95c31..f5d77ef780b9 100644 --- a/drivers/tee/optee/call.c +++ b/drivers/tee/optee/call.c @@ -1,6 +1,6 @@ // 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> @@ -118,20 +118,25 @@ static struct optee_session *find_session(struct optee_context_data *ctxdata, /** * 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 + * @arg: shared memory holding the message to pass to secure world * * Does and SMC to OP-TEE in secure world and handles eventual resulting * Remote Procedure Calls (RPC) from OP-TEE. * * Returns return code from secure world, 0 is OK */ -u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg) +int optee_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg) { struct optee *optee = tee_get_drvdata(ctx->teedev); struct optee_call_waiter w; struct optee_rpc_param param = { }; struct optee_call_ctx call_ctx = { }; - u32 ret; + phys_addr_t parg; + int rc; + + rc = tee_shm_get_pa(arg, 0, &parg); + if (rc) + return rc;

param.a0 = OPTEE_SMC_CALL_WITH_ARG; reg_pair_from_64(&param.a1, &param.a2, parg); @@ -160,7 +165,7 @@ u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg) param.a3 = res.a3; optee_handle_rpc(ctx, &param, &call_ctx); } else { - ret = res.a0; + rc = res.a0; break; } } @@ -172,14 +177,12 @@ u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg) */ optee_cq_wait_final(&optee->call_queue, &w);

- return ret; + return rc; }

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) + struct optee_msg_arg **msg_arg) { - int rc; struct tee_shm *shm; struct optee_msg_arg *ma;

@@ -190,22 +193,13 @@ static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params,

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; } @@ -214,15 +208,15 @@ 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;

/* +2 for the meta parameters added below */ - shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg, &msg_parg); + shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg); if (IS_ERR(shm)) return PTR_ERR(shm);

@@ -245,7 +239,8 @@ int optee_open_session(struct tee_context *ctx, if (rc) goto out;

- 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;

@@ -255,7 +250,7 @@ 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; } @@ -270,7 +265,8 @@ 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 */ @@ -289,16 +285,16 @@ int optee_open_session(struct tee_context *ctx, 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; - phys_addr_t msg_parg;

- shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg); + shm = 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_do_call_with_arg(ctx, msg_parg); + optee->ops->do_call_with_arg(ctx, shm);

tee_shm_free(shm);

@@ -326,10 +322,10 @@ 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) { + 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;

@@ -340,7 +336,7 @@ 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 = 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; @@ -348,16 +344,18 @@ 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; } @@ -371,10 +369,10 @@ 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 */ @@ -384,14 +382,14 @@ 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 = 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; @@ -590,10 +588,10 @@ 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 *optee = tee_get_drvdata(ctx->teedev); struct optee_msg_arg *msg_arg; + struct tee_shm *shm_arg; u64 *pages_list; - phys_addr_t msg_parg; int rc;

if (!num_pages) @@ -607,7 +605,7 @@ int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm, if (!pages_list) return -ENOMEM;

- shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg); + shm_arg = get_msg_arg(ctx, 1, &msg_arg); if (IS_ERR(shm_arg)) { rc = PTR_ERR(shm_arg); goto out; @@ -628,7 +626,7 @@ int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm, 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) || + if (optee->ops->do_call_with_arg(ctx, shm) || msg_arg->ret != TEEC_SUCCESS) rc = -EINVAL;

@@ -640,12 +638,12 @@ int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,

int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm) { - struct tee_shm *shm_arg; + struct optee *optee = tee_get_drvdata(ctx->teedev); struct optee_msg_arg *msg_arg; - phys_addr_t msg_parg; + struct tee_shm *shm_arg; int rc = 0;

- shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg); + shm_arg = get_msg_arg(ctx, 1, &msg_arg); if (IS_ERR(shm_arg)) return PTR_ERR(shm_arg);

@@ -654,7 +652,7 @@ int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *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) || + if (optee->ops->do_call_with_arg(ctx, shm) || msg_arg->ret != TEEC_SUCCESS) rc = -EINVAL; tee_shm_free(shm_arg); diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c index 949223b214c3..f689f171a794 100644 --- a/drivers/tee/optee/core.c +++ b/drivers/tee/optee/core.c @@ -1,6 +1,6 @@ // SPDX-License-Identifier: GPL-2.0-only /* - * Copyright (c) 2015, Linaro Limited + * Copyright (c) 2015-2021, Linaro Limited */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt @@ -26,21 +26,87 @@

#define OPTEE_SHM_NUM_PRIV_PAGES CONFIG_OPTEE_SHM_NUM_PRIV_PAGES

+static void from_msg_param_value(struct tee_param *p, u32 attr, + const struct optee_msg_param *mp) +{ + 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 int from_msg_param_tmp_mem(struct tee_param *p, u32 attr, + const struct optee_msg_param *mp) +{ + struct tee_shm *shm; + phys_addr_t pa; + int rc; + + p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT + + attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT; + p->u.memref.size = mp->u.tmem.size; + shm = (struct tee_shm *)(unsigned long)mp->u.tmem.shm_ref; + if (!shm) { + p->u.memref.shm_offs = 0; + p->u.memref.shm = NULL; + return 0; + } + + 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; + + /* Check that the memref is covered by the shm object */ + if (p->u.memref.size) { + size_t o = p->u.memref.shm_offs + + p->u.memref.size - 1; + + rc = tee_shm_get_pa(shm, o, NULL); + if (rc) + return rc; + } + + return 0; +} + +static void from_msg_param_reg_mem(struct tee_param *p, u32 attr, + const struct optee_msg_param *mp) +{ + struct tee_shm *shm; + + p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT + + attr - OPTEE_MSG_ATTR_TYPE_RMEM_INPUT; + p->u.memref.size = mp->u.rmem.size; + shm = (struct tee_shm *)(unsigned long)mp->u.rmem.shm_ref; + + if (shm) { + p->u.memref.shm_offs = mp->u.rmem.offs; + p->u.memref.shm = shm; + } else { + p->u.memref.shm_offs = 0; + p->u.memref.shm = NULL; + } +} + /** * optee_from_msg_param() - convert from OPTEE_MSG parameters to * struct tee_param + * @optee: main service struct * @params: subsystem internal parameter representation * @num_params: number of elements in the parameter arrays * @msg_params: OPTEE_MSG parameters * Returns 0 on success or <0 on failure */ -int optee_from_msg_param(struct tee_param *params, size_t num_params, - const struct optee_msg_param *msg_params) +static int optee_from_msg_param(struct optee *optee, struct tee_param *params, + size_t num_params, + const struct optee_msg_param *msg_params) { int rc; size_t n; - struct tee_shm *shm; - phys_addr_t pa;

for (n = 0; n < num_params; n++) { struct tee_param *p = params + n; @@ -55,48 +121,19 @@ int optee_from_msg_param(struct tee_param *params, size_t num_params, 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; + from_msg_param_value(p, attr, mp); break; case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT: case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT: case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT: - 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); + rc = from_msg_param_tmp_mem(p, attr, mp); 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; - - 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; - + from_msg_param_reg_mem(p, attr, mp); break;

default: @@ -106,6 +143,16 @@ int optee_from_msg_param(struct tee_param *params, size_t num_params, return 0; }

+static void to_msg_param_value(struct optee_msg_param *mp, + const struct tee_param *p) +{ + mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr - + TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT; + mp->u.value.a = p->u.value.a; + mp->u.value.b = p->u.value.b; + mp->u.value.c = p->u.value.c; +} + static int to_msg_param_tmp_mem(struct optee_msg_param *mp, const struct tee_param *p) { @@ -148,13 +195,15 @@ static int to_msg_param_reg_mem(struct optee_msg_param *mp,

/** * optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters + * @optee: main service struct * @msg_params: OPTEE_MSG parameters * @num_params: number of elements in the parameter arrays * @params: subsystem itnernal parameter representation * Returns 0 on success or <0 on failure */ -int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params, - const struct tee_param *params) +static int optee_to_msg_param(struct optee *optee, + struct optee_msg_param *msg_params, + size_t num_params, const struct tee_param *params) { int rc; size_t n; @@ -171,11 +220,7 @@ int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params, 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; + to_msg_param_value(mp, p); break; case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT: case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT: @@ -301,7 +346,7 @@ static void optee_release_supp(struct tee_context *ctx) optee_supp_release(&optee->supp); }

-static const struct tee_driver_ops optee_ops = { +static const struct tee_driver_ops optee_clnt_ops = { .get_version = optee_get_version, .open = optee_open, .release = optee_release, @@ -313,9 +358,9 @@ static const struct tee_driver_ops optee_ops = { .shm_unregister = optee_shm_unregister, };

-static const struct tee_desc optee_desc = { +static const struct tee_desc optee_clnt_desc = { .name = DRIVER_NAME "-clnt", - .ops = &optee_ops, + .ops = &optee_clnt_ops, .owner = THIS_MODULE, };

@@ -336,6 +381,12 @@ static const struct tee_desc optee_supp_desc = { .flags = TEE_DESC_PRIVILEGED, };

+static const struct optee_ops optee_ops = { + .do_call_with_arg = optee_do_call_with_arg, + .to_msg_param = optee_to_msg_param, + .from_msg_param = optee_from_msg_param, +}; + static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn) { struct arm_smccc_res res; @@ -637,10 +688,11 @@ static int optee_probe(struct platform_device *pdev) goto err; }

+ optee->ops = &optee_ops; optee->invoke_fn = invoke_fn; optee->sec_caps = sec_caps;

- teedev = tee_device_alloc(&optee_desc, NULL, pool, optee); + teedev = tee_device_alloc(&optee_clnt_desc, NULL, pool, optee); if (IS_ERR(teedev)) { rc = PTR_ERR(teedev); goto err; diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h index 2b63b796645e..c5741e96e967 100644 --- a/drivers/tee/optee/optee_private.h +++ b/drivers/tee/optee/optee_private.h @@ -1,6 +1,6 @@ /* SPDX-License-Identifier: GPL-2.0-only */ /* - * Copyright (c) 2015, Linaro Limited + * Copyright (c) 2015-2021, Linaro Limited */

#ifndef OPTEE_PRIVATE_H @@ -66,9 +66,34 @@ struct optee_supp { struct completion reqs_c; };

+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 * @call_queue: queue of threads waiting to call @invoke_fn @@ -86,6 +111,7 @@ struct optee_supp { struct optee { struct tee_device *supp_teedev; struct tee_device *teedev; + const struct optee_ops *ops; optee_invoke_fn *invoke_fn; struct optee_call_queue call_queue; struct optee_wait_queue wait_queue; @@ -148,7 +174,7 @@ 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_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg); int optee_open_session(struct tee_context *ctx, struct tee_ioctl_open_session_arg *arg, struct tee_param *param); @@ -171,11 +197,6 @@ int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm, 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, diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c index 1849180b0278..39562fb6841e 100644 --- a/drivers/tee/optee/rpc.c +++ b/drivers/tee/optee/rpc.c @@ -1,6 +1,6 @@ // 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 @@ -55,6 +55,7 @@ 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 +80,8 @@ 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 +124,8 @@ 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 +237,7 @@ 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; @@ -248,14 +251,16 @@ 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); @@ -480,7 +485,7 @@ static void handle_rpc_func_cmd(struct tee_context *ctx, struct optee *optee, handle_rpc_func_cmd_i2c_transfer(ctx, arg); break; default: - handle_rpc_supp_cmd(ctx, arg); + handle_rpc_supp_cmd(ctx, optee, arg); } }

-- 2.25.1

Jens Wiklander

9:14 a.m.

New subject: [PATCH v2 4/5] optee: add a FF-A memory pool

Adds a memory pool to be used when the driver uses FF-A [1] as transport layer.

[1] https://developer.arm.com/documentation/den0077/latest Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/optee/shm_pool.c | 65 +++++++++++++++++++++++++++++++++--- drivers/tee/optee/shm_pool.h | 1 + 2 files changed, 61 insertions(+), 5 deletions(-)

diff --git a/drivers/tee/optee/shm_pool.c b/drivers/tee/optee/shm_pool.c index d767eebf30bd..d2116cb39c8b 100644 --- a/drivers/tee/optee/shm_pool.c +++ b/drivers/tee/optee/shm_pool.c @@ -12,8 +12,14 @@ #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) +static int +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)) { unsigned int order = get_order(size); struct page *page; @@ -27,7 +33,7 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, shm->paddr = page_to_phys(page); shm->size = PAGE_SIZE << order;

- if (shm->flags & TEE_SHM_DMA_BUF) { + if (shm_register) { unsigned int nr_pages = 1 << order, i; struct page **pages;

@@ -41,14 +47,23 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, }

shm->flags |= TEE_SHM_REGISTER; - rc = optee_shm_register(shm->ctx, shm, pages, nr_pages, - (unsigned long)shm->kaddr); + rc = shm_register(shm->ctx, shm, pages, nr_pages, + (unsigned long)shm->kaddr); kfree(pages); }

return rc; }

+static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, + struct tee_shm *shm, size_t size) +{ + if (!(shm->flags & TEE_SHM_DMA_BUF)) + return pool_op_alloc_helper(poolm, shm, size, NULL); + + return pool_op_alloc_helper(poolm, shm, size, optee_shm_register); +} + static void pool_op_free(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm) { @@ -87,3 +102,43 @@ struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)

return mgr; } + +#ifdef CONFIG_ARM_FFA_TRANSPORT +static int pool_ffa_op_alloc(struct tee_shm_pool_mgr *poolm, + struct tee_shm *shm, size_t size) +{ + return 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 const struct tee_shm_pool_mgr_ops pool_ffa_ops = { + .alloc = pool_ffa_op_alloc, + .free = pool_ffa_op_free, + .destroy_poolmgr = pool_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. + */ +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; +} +#endif /*CONFIG_ARM_FFA_TRANSPORT*/ diff --git a/drivers/tee/optee/shm_pool.h b/drivers/tee/optee/shm_pool.h index 28109d991c4b..34c5fd74a3ff 100644 --- a/drivers/tee/optee/shm_pool.h +++ b/drivers/tee/optee/shm_pool.h @@ -10,5 +10,6 @@ #include <linux/tee_drv.h>

struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void); +struct tee_shm_pool_mgr *optee_ffa_shm_pool_alloc_pages(void);

#endif

-- 2.25.1

Jens Wiklander

9:14 a.m.

New subject: [PATCH v2 5/5] optee: add FF-A support

Adds support for using FF-A [1] as transport to the OP-TEE driver.

Introduces struct optee_msg_param_fmem which carries all information needed when OP-TEE is calling FFA_MEM_RETRIEVE_REQ to get the shared memory reference mapped by the hypervisor in S-EL2. Register usage is also updated to include the information needed.

The FF-A part of this driver is enabled if CONFIG_ARM_FFA_TRANSPORT is enabled.

[1] https://developer.arm.com/documentation/den0077/latest Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/tee/optee/call.c | 212 ++++++++++++- drivers/tee/optee/core.c | 486 +++++++++++++++++++++++++++++- drivers/tee/optee/optee_ffa.h | 153 ++++++++++ drivers/tee/optee/optee_msg.h | 27 +- drivers/tee/optee/optee_private.h | 52 ++++ drivers/tee/optee/rpc.c | 118 ++++++++ 6 files changed, 1040 insertions(+), 8 deletions(-) create mode 100644 drivers/tee/optee/optee_ffa.h

diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c index f5d77ef780b9..c21f59111fc8 100644 --- a/drivers/tee/optee/call.c +++ b/drivers/tee/optee/call.c @@ -3,15 +3,18 @@ * Copyright (c) 2015-2021, Linaro Limited */ #include <linux/arm-smccc.h> +#include <linux/arm_ffa.h> #include <linux/device.h> #include <linux/err.h> #include <linux/errno.h> #include <linux/mm.h> #include <linux/sched.h> +#include <linux/scatterlist.h> #include <linux/slab.h> #include <linux/tee_drv.h> #include <linux/types.h> #include <linux/uaccess.h> +#include "optee_ffa.h" #include "optee_private.h" #include "optee_smc.h" #define CREATE_TRACE_POINTS @@ -183,11 +186,21 @@ int optee_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg) static struct tee_shm *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); + 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); + /* + * 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. So far only + * enabled when using FF-A as transport layer. + */ + if (optee->rpc_arg_count) + sz += OPTEE_MSG_GET_ARG_SIZE(optee->rpc_arg_count); + + shm = tee_shm_alloc(ctx, sz, TEE_SHM_MAPPED); if (IS_ERR(shm)) return shm;

@@ -674,3 +687,198 @@ int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm) { return 0; } + +#ifdef CONFIG_ARM_FFA_TRANSPORT +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 + */ + +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); +} + +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 = 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; +} + +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; +} + +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; +} +#endif /*CONFIG_ARM_FFA_TRANSPORT*/ diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c index f689f171a794..cf5eeac4c8b0 100644 --- a/drivers/tee/optee/core.c +++ b/drivers/tee/optee/core.c @@ -6,6 +6,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/arm-smccc.h> +#include <linux/arm_ffa.h> #include <linux/errno.h> #include <linux/io.h> #include <linux/module.h> @@ -20,6 +21,7 @@ #include <linux/workqueue.h> #include "optee_private.h" #include "optee_smc.h" +#include "optee_ffa.h" #include "shm_pool.h"

#define DRIVER_NAME "optee" @@ -299,10 +301,9 @@ 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 = optee_is_ffa_based(optee) || + (optee->sec_caps & + OPTEE_SMC_SEC_CAP_MEMREF_NULL);

ctx->data = ctxdata; return 0; @@ -567,6 +568,472 @@ optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm) return rc; }

+#ifdef CONFIG_ARM_FFA_TRANSPORT +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; +} + +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, +}; + +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; +} + +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; +} + +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; +} + +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: + 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: + 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; +} + +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, + u32 *sec_caps, 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; + } + + *sec_caps = 0; + *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 const struct tee_driver_ops optee_ffa_clnt_ops = { + .get_version = optee_ffa_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_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_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) +{ + (void)ffa_dev; +} + +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; + u32 sec_caps; + 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, &sec_caps, + &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->sec_caps = sec_caps; + 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); + + 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, +}; + +module_ffa_driver(optee_ffa_driver); +#endif /*CONFIG_ARM_FFA_TRANSPORT*/ + /* 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, @@ -615,7 +1082,8 @@ static int optee_remove(struct platform_device *pdev) * reference counters and also avoid wild pointers in secure world * into the old shared memory range. */ - optee_disable_shm_cache(optee); + if (!optee_is_ffa_based(optee)) + optee_disable_shm_cache(optee);

/* * The two devices have to be unregistered before we can free the @@ -631,6 +1099,14 @@ static int optee_remove(struct platform_device *pdev) optee_supp_uninit(&optee->supp); mutex_destroy(&optee->call_queue.mutex);

+#ifdef CONFIG_ARM_FFA_TRANSPORT + if (optee->ffa.ffa_ops) { + mutex_destroy(&optee->ffa.mutex); + rhashtable_free_and_destroy(&optee->ffa.global_ids, + rh_free_fn, NULL); + } +#endif /*CONFIG_ARM_FFA_TRANSPORT*/ + kfree(optee);

return 0; diff --git a/drivers/tee/optee/optee_ffa.h b/drivers/tee/optee/optee_ffa.h new file mode 100644 index 000000000000..ee3a03fc392c --- /dev/null +++ b/drivers/tee/optee/optee_ffa.h @@ -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*/ diff --git a/drivers/tee/optee/optee_msg.h b/drivers/tee/optee/optee_msg.h index 81ff593ac4ec..813e791a61e6 100644 --- a/drivers/tee/optee/optee_msg.h +++ b/drivers/tee/optee/optee_msg.h @@ -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 * @@ -143,12 +165,14 @@ 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 * * @attr & OPTEE_MSG_ATTR_TYPE_MASK indicates if tmem, rmem or value is used in * the union. OPTEE_MSG_ATTR_TYPE_VALUE_* indicates value, * 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 { @@ -156,6 +180,7 @@ 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; } u; }; diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h index c5741e96e967..1ffe74e66d15 100644 --- a/drivers/tee/optee/optee_private.h +++ b/drivers/tee/optee/optee_private.h @@ -7,6 +7,7 @@ #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> @@ -20,6 +21,7 @@ #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 @@ -66,6 +68,22 @@ struct optee_supp { struct completion reqs_c; };

+/** + * 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;

/** @@ -113,11 +131,15 @@ struct optee { struct tee_device *teedev; const struct optee_ops *ops; optee_invoke_fn *invoke_fn; +#ifdef CONFIG_ARM_FFA_TRANSPORT + struct optee_ffa ffa; +#endif struct optee_call_queue call_queue; struct optee_wait_queue wait_queue; struct optee_supp supp; struct tee_shm_pool *pool; void *memremaped_shm; + unsigned int rpc_arg_count; u32 sec_caps; bool scan_bus_done; struct workqueue_struct *scan_bus_wq; @@ -206,6 +228,36 @@ void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages, #define PTA_CMD_GET_DEVICES_SUPP 0x1 int optee_enumerate_devices(u32 func);

+int optee_shm_add_ffa_handle(struct optee *optee, struct tee_shm *shm, + u64 global_id); +int optee_shm_rem_ffa_handle(struct optee *optee, u64 global_id); + +struct tee_shm *optee_shm_from_ffa_handle(struct optee *optee, u64 global_id); + +int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm, + struct page **pages, size_t num_pages, + unsigned long start); +int optee_ffa_shm_unregister(struct tee_context *ctx, struct tee_shm *shm); +int optee_ffa_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm, + struct page **pages, size_t num_pages, + unsigned long start); +int optee_ffa_shm_unregister_supp(struct tee_context *ctx, + struct tee_shm *shm); + +int optee_ffa_do_call_with_arg(struct tee_context *ctx, struct tee_shm *arg); +int optee_ffa_rpc_shm_register(struct tee_context *ctx, struct tee_shm *shm); +void optee_handle_ffa_rpc(struct tee_context *ctx, u32 cmd, + struct optee_msg_arg *arg); + +static inline bool optee_is_ffa_based(struct optee *optee) +{ +#ifdef CONFIG_ARM_FFA_TRANSPORT + return optee->ffa.ffa_ops; +#else + return false; +#endif +} + /* * Small helpers */ diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c index 39562fb6841e..865a9ab3cf65 100644 --- a/drivers/tee/optee/rpc.c +++ b/drivers/tee/optee/rpc.c @@ -10,6 +10,7 @@ #include <linux/i2c.h> #include <linux/slab.h> #include <linux/tee_drv.h> +#include "optee_ffa.h" #include "optee_private.h" #include "optee_smc.h" #include "optee_rpc_cmd.h" @@ -543,3 +544,120 @@ void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param,

param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC; } + +#ifdef CONFIG_ARM_FFA_TRANSPORT +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 = 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); + 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: + 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_GET_TIME: + handle_rpc_func_cmd_get_time(arg); + break; + case OPTEE_RPC_CMD_WAIT_QUEUE: + handle_rpc_func_cmd_wq(optee, arg); + break; + case OPTEE_RPC_CMD_SUSPEND: + handle_rpc_func_cmd_wait(arg); + break; + 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; + case OPTEE_RPC_CMD_I2C_TRANSFER: + handle_rpc_func_cmd_i2c_transfer(ctx, arg); + break; + default: + handle_rpc_supp_cmd(ctx, optee, arg); + } +} + +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; + } +} +#endif /*CONFIG_ARM_FFA_TRANSPORT*/

-- 2.25.1

Sumit Garg

14 Jul 14 Jul

12:09 p.m.

Hi Jens,

This patch-set skipped my inbox as I was not on the CC list. So while reading through ML archives, I found it.

On Thu, 27 May 2021 at 13:45, Jens Wiklander jens.wiklander@linaro.org wrote:

...

Hi all,

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

These patches are based on the FF-A v7 patch set by Sudeep Holla [2] [3].

I could see the FF-A driver support merged upstream. Is this patch-set directly applicable on the upstream kernel? If yes, can you also share steps to test it on Qemu?

...

There is one change to the TEE subsystem with "tee: add sec_world_id to struct tee_shm" to add support for holding globally unique handle assigned by the FF-A. This is a field that I believe could useful for the AMDTEE driver too.

For communication the OP-TEE message protocol is still used, but with a new type of memory reference, struct optee_msg_param_fmem, to carry the information needed by FF-A. The OP-TEE driver is refactored internally with to sets of callbacks, one for the old SMC based communication and another set with FF-A as transport.

Since now we have two ABIs towards secure world: - OP-TEE ABI - FF-A ABI

I think it would be better to have ABI specific APIs separated from core.c to have a clear view of abstraction. How about new file names as: - optee_{msg/abi}.c - ffa_{msg/abi}.c

...

There is also a difference in how the drivers are instantiated. With the SMC based transport we have a platform driver, module_platform_driver(), today which we're keeping as is for this configuration. In a FF-A system we have a FF-A driver, module_ffa_driver(), instead.

The OP-TEE driver can be compiled for both targets at the same time and it's up to runtime configuration (device tree or ACPI) to decide how it's initialized.

Can you elaborate on different device tree or ACPI configuration? AFAIR, FF-A utilizes bus enumeration to scan OP-TEE UUID.

-Sumit

...

Thanks, Jens

[1] https://developer.arm.com/documentation/den0077/latest [2] https://lore.kernel.org/linux-arm-kernel/20210521151033.181846-1-sudeep.holl... [3] git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git v5.13/ffa

v1->v2:

Rebased to the FF-A v7 patch

Fixed a couple of reports from kernel test robot lkp@intel.com

Jens Wiklander (5): tee: add sec_world_id to struct tee_shm optee: simplify optee_release() optee: refactor driver with internal callbacks optee: add a FF-A memory pool optee: add FF-A support

drivers/tee/optee/call.c | 325 +++++++++++--- drivers/tee/optee/core.c | 689 ++++++++++++++++++++++++++---- drivers/tee/optee/optee_ffa.h | 153 +++++++ drivers/tee/optee/optee_msg.h | 27 +- drivers/tee/optee/optee_private.h | 88 +++- drivers/tee/optee/rpc.c | 137 +++++- drivers/tee/optee/shm_pool.c | 65 ++- drivers/tee/optee/shm_pool.h | 1 + include/linux/tee_drv.h | 7 +- 9 files changed, 1326 insertions(+), 166 deletions(-) create mode 100644 drivers/tee/optee/optee_ffa.h

-- 2.25.1

linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Jens Wiklander

19 Jul 19 Jul

1:36 p.m.

Hi Sumit,

On Wed, Jul 14, 2021 at 1:09 PM Sumit Garg sumit.garg@linaro.org wrote:

...

Hi Jens,

This patch-set skipped my inbox as I was not on the CC list. So while reading through ML archives, I found it.

Thanks, I'll include you in the next version.

...

On Thu, 27 May 2021 at 13:45, Jens Wiklander jens.wiklander@linaro.org wrote:

...
Hi all,

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

These patches are based on the FF-A v7 patch set by Sudeep Holla [2] [3].

I could see the FF-A driver support merged upstream. Is this patch-set directly applicable on the upstream kernel? If yes, can you also share steps to test it on Qemu?

It's very likely this will work with the upstream kernel. My test setup when posting this patchset was:

The repo for SPMC at S-EL1 retrieved by repo init -u https://github.com/jenswi-linaro/manifest.git -m qemu_v8.xml -b ffav4_spmc repo sync

- optee_os, optee_client and optee_test tracking upstream/master - TF-A rebased on v2.5 with a smallish patch to enable SPMD support for QEMU v8 - Linux kernel based on 5.13-rc2 with a previous version of the FF-A patchset, it should be easy enough to rebase this on v5.14-rc1.

To build do: cd build make toolchains make all

To boot: make run-only

Test as usual with xtest.

...

...
There is one change to the TEE subsystem with "tee: add sec_world_id to struct tee_shm" to add support for holding globally unique handle assigned by the FF-A. This is a field that I believe could useful for the AMDTEE driver too.

For communication the OP-TEE message protocol is still used, but with a new type of memory reference, struct optee_msg_param_fmem, to carry the information needed by FF-A. The OP-TEE driver is refactored internally with to sets of callbacks, one for the old SMC based communication and another set with FF-A as transport.

Since now we have two ABIs towards secure world:

OP-TEE ABI

FF-A ABI

I think it would be better to have ABI specific APIs separated from core.c to have a clear view of abstraction. How about new file names as:

optee_{msg/abi}.c

ffa_{msg/abi}.c

I'll try something along this in the V3 which I intend to post quite soon.

...

...
There is also a difference in how the drivers are instantiated. With the SMC based transport we have a platform driver, module_platform_driver(), today which we're keeping as is for this configuration. In a FF-A system we have a FF-A driver, module_ffa_driver(), instead.

The OP-TEE driver can be compiled for both targets at the same time and it's up to runtime configuration (device tree or ACPI) to decide how it's initialized.

Can you elaborate on different device tree or ACPI configuration? AFAIR, FF-A utilizes bus enumeration to scan OP-TEE UUID.

This is a part that has changed in the FF-A framework since this patchset was posted. With this upstream kernel it doesn't need a device tree or ACPI.

Cheers, Jens

...

-Sumit

...
Thanks, Jens

[1] https://developer.arm.com/documentation/den0077/latest [2] https://lore.kernel.org/linux-arm-kernel/20210521151033.181846-1-sudeep.holl... [3] git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git v5.13/ffa

v1->v2:

Rebased to the FF-A v7 patch

Fixed a couple of reports from kernel test robot lkp@intel.com

Jens Wiklander (5): tee: add sec_world_id to struct tee_shm optee: simplify optee_release() optee: refactor driver with internal callbacks optee: add a FF-A memory pool optee: add FF-A support

drivers/tee/optee/call.c | 325 +++++++++++--- drivers/tee/optee/core.c | 689 ++++++++++++++++++++++++++---- drivers/tee/optee/optee_ffa.h | 153 +++++++ drivers/tee/optee/optee_msg.h | 27 +- drivers/tee/optee/optee_private.h | 88 +++- drivers/tee/optee/rpc.c | 137 +++++- drivers/tee/optee/shm_pool.c | 65 ++- drivers/tee/optee/shm_pool.h | 1 + include/linux/tee_drv.h | 7 +- 9 files changed, 1326 insertions(+), 166 deletions(-) create mode 100644 drivers/tee/optee/optee_ffa.h

-- 2.25.1

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Jens Wiklander
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