tee: optee: add TEE bus device enumeration support (c3fa24af) · Commits · 戴 / test

drivers/tee/optee/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -5,3 +5,4 @@ optee-objs += call.o
		optee-objs += rpc.o
		optee-objs += supp.o
		optee-objs += shm_pool.o
		optee-objs += device.o

drivers/tee/optee/core.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -634,6 +634,10 @@ static struct optee optee_probe(struct device_node np)
		if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
		pr_info("dynamic shared memory is enabled\n");

		rc = optee_enumerate_devices();
		if (rc)
		goto err;

		pr_info("initialized driver\n");
		return optee;
		err:

drivers/tee/optee/device.c

0 → 100644

+155 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/*
		* Copyright (C) 2019 Linaro Ltd.
		*/

		#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

		#include <linux/kernel.h>
		#include <linux/slab.h>
		#include <linux/tee_drv.h>
		#include <linux/uuid.h>
		#include "optee_private.h"

		/*
		* Get device UUIDs
		*
		* [out] memref[0] Array of device UUIDs
		*
		* Return codes:
		* TEE_SUCCESS - Invoke command success
		* TEE_ERROR_BAD_PARAMETERS - Incorrect input param
		* TEE_ERROR_SHORT_BUFFER - Output buffer size less than required
		*/
		#define PTA_CMD_GET_DEVICES 0x0

		static int optee_ctx_match(struct tee_ioctl_version_data ver, const void data)
		{
		if (ver->impl_id == TEE_IMPL_ID_OPTEE)
		return 1;
		else
		return 0;
		}

		static int get_devices(struct tee_context *ctx, u32 session,
		struct tee_shm device_shm, u32 shm_size)
		{
		u32 ret = 0;
		struct tee_ioctl_invoke_arg inv_arg = {0};
		struct tee_param param[4] = {0};

		/* Invoke PTA_CMD_GET_DEVICES function */
		inv_arg.func = PTA_CMD_GET_DEVICES;
		inv_arg.session = session;
		inv_arg.num_params = 4;

		/* Fill invoke cmd params */
		param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT;
		param[0].u.memref.shm = device_shm;
		param[0].u.memref.size = *shm_size;
		param[0].u.memref.shm_offs = 0;

		ret = tee_client_invoke_func(ctx, &inv_arg, param);
		if ((ret < 0) \|\| ((inv_arg.ret != TEEC_SUCCESS) &&
		(inv_arg.ret != TEEC_ERROR_SHORT_BUFFER))) {
		pr_err("PTA_CMD_GET_DEVICES invoke function err: %x\n",
		inv_arg.ret);
		return -EINVAL;
		}

		*shm_size = param[0].u.memref.size;

		return 0;
		}

		static int optee_register_device(const uuid_t *device_uuid, u32 device_id)
		{
		struct tee_client_device *optee_device = NULL;
		int rc;

		optee_device = kzalloc(sizeof(*optee_device), GFP_KERNEL);
		if (!optee_device)
		return -ENOMEM;

		optee_device->dev.bus = &tee_bus_type;
		dev_set_name(&optee_device->dev, "optee-clnt%u", device_id);
		uuid_copy(&optee_device->id.uuid, device_uuid);

		rc = device_register(&optee_device->dev);
		if (rc) {
		pr_err("device registration failed, err: %d\n", rc);
		kfree(optee_device);
		}

		return rc;
		}

		int optee_enumerate_devices(void)
		{
		const uuid_t pta_uuid =
		UUID_INIT(0x7011a688, 0xddde, 0x4053,
		0xa5, 0xa9, 0x7b, 0x3c, 0x4d, 0xdf, 0x13, 0xb8);
		struct tee_ioctl_open_session_arg sess_arg = {0};
		struct tee_shm *device_shm = NULL;
		const uuid_t *device_uuid = NULL;
		struct tee_context *ctx = NULL;
		u32 shm_size = 0, idx, num_devices = 0;
		int rc;

		/* Open context with OP-TEE driver */
		ctx = tee_client_open_context(NULL, optee_ctx_match, NULL, NULL);
		if (IS_ERR(ctx))
		return -ENODEV;

		/* Open session with device enumeration pseudo TA */
		memcpy(sess_arg.uuid, pta_uuid.b, TEE_IOCTL_UUID_LEN);
		sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;
		sess_arg.num_params = 0;

		rc = tee_client_open_session(ctx, &sess_arg, NULL);
		if ((rc < 0) \|\| (sess_arg.ret != TEEC_SUCCESS)) {
		/* Device enumeration pseudo TA not found */
		rc = 0;
		goto out_ctx;
		}

		rc = get_devices(ctx, sess_arg.session, NULL, &shm_size);
		if (rc < 0 \|\| !shm_size)
		goto out_sess;

		device_shm = tee_shm_alloc(ctx, shm_size,
		TEE_SHM_MAPPED \| TEE_SHM_DMA_BUF);
		if (IS_ERR(device_shm)) {
		pr_err("tee_shm_alloc failed\n");
		rc = PTR_ERR(device_shm);
		goto out_sess;
		}

		rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size);
		if (rc < 0)
		goto out_shm;

		device_uuid = tee_shm_get_va(device_shm, 0);
		if (IS_ERR(device_uuid)) {
		pr_err("tee_shm_get_va failed\n");
		rc = PTR_ERR(device_uuid);
		goto out_shm;
		}

		num_devices = shm_size / sizeof(uuid_t);

		for (idx = 0; idx < num_devices; idx++) {
		rc = optee_register_device(&device_uuid[idx], idx);
		if (rc)
		goto out_shm;
		}

		out_shm:
		tee_shm_free(device_shm);
		out_sess:
		tee_client_close_session(ctx, sess_arg.session);
		out_ctx:
		tee_client_close_context(ctx);

		return rc;
		}

drivers/tee/optee/optee_private.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -28,6 +28,7 @@
		#define TEEC_ERROR_BAD_PARAMETERS 0xFFFF0006
		#define TEEC_ERROR_COMMUNICATION 0xFFFF000E
		#define TEEC_ERROR_OUT_OF_MEMORY 0xFFFF000C
		#define TEEC_ERROR_SHORT_BUFFER 0xFFFF0010

		#define TEEC_ORIGIN_COMMS 0x00000002

		@@ -181,6 +182,8 @@ void optee_free_pages_list(void *array, size_t num_entries);
		void optee_fill_pages_list(u64 dst, struct page *pages, int num_pages,
		size_t page_offset);

		int optee_enumerate_devices(void);

		/*
		* Small helpers
		*/

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