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583 lines
18 KiB
583 lines
18 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (c) 2015-2016, Linaro Limited |
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*/ |
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#ifndef __TEE_DRV_H |
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#define __TEE_DRV_H |
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#include <linux/device.h> |
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#include <linux/idr.h> |
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#include <linux/kref.h> |
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#include <linux/list.h> |
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#include <linux/mod_devicetable.h> |
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#include <linux/tee.h> |
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#include <linux/types.h> |
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#include <linux/uuid.h> |
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/* |
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* The file describes the API provided by the generic TEE driver to the |
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* specific TEE driver. |
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*/ |
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#define TEE_SHM_MAPPED BIT(0) /* Memory mapped by the kernel */ |
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#define TEE_SHM_DMA_BUF BIT(1) /* Memory with dma-buf handle */ |
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#define TEE_SHM_EXT_DMA_BUF BIT(2) /* Memory with dma-buf handle */ |
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#define TEE_SHM_REGISTER BIT(3) /* Memory registered in secure world */ |
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#define TEE_SHM_USER_MAPPED BIT(4) /* Memory mapped in user space */ |
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#define TEE_SHM_POOL BIT(5) /* Memory allocated from pool */ |
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#define TEE_SHM_KERNEL_MAPPED BIT(6) /* Memory mapped in kernel space */ |
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struct device; |
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struct tee_device; |
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struct tee_shm; |
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struct tee_shm_pool; |
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/** |
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* struct tee_context - driver specific context on file pointer data |
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* @teedev: pointer to this drivers struct tee_device |
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* @list_shm: List of shared memory object owned by this context |
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* @data: driver specific context data, managed by the driver |
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* @refcount: reference counter for this structure |
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* @releasing: flag that indicates if context is being released right now. |
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* It is needed to break circular dependency on context during |
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* shared memory release. |
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* @supp_nowait: flag that indicates that requests in this context should not |
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* wait for tee-supplicant daemon to be started if not present |
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* and just return with an error code. It is needed for requests |
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* that arises from TEE based kernel drivers that should be |
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* non-blocking in nature. |
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* @cap_memref_null: flag indicating if the TEE Client support shared |
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* memory buffer with a NULL pointer. |
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*/ |
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struct tee_context { |
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struct tee_device *teedev; |
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void *data; |
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struct kref refcount; |
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bool releasing; |
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bool supp_nowait; |
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bool cap_memref_null; |
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}; |
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struct tee_param_memref { |
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size_t shm_offs; |
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size_t size; |
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struct tee_shm *shm; |
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}; |
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struct tee_param_value { |
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u64 a; |
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u64 b; |
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u64 c; |
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}; |
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struct tee_param { |
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u64 attr; |
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union { |
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struct tee_param_memref memref; |
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struct tee_param_value value; |
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} u; |
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}; |
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/** |
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* struct tee_driver_ops - driver operations vtable |
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* @get_version: returns version of driver |
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* @open: called when the device file is opened |
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* @release: release this open file |
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* @open_session: open a new session |
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* @close_session: close a session |
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* @invoke_func: invoke a trusted function |
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* @cancel_req: request cancel of an ongoing invoke or open |
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* @supp_recv: called for supplicant to get a command |
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* @supp_send: called for supplicant to send a response |
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* @shm_register: register shared memory buffer in TEE |
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* @shm_unregister: unregister shared memory buffer in TEE |
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*/ |
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struct tee_driver_ops { |
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void (*get_version)(struct tee_device *teedev, |
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struct tee_ioctl_version_data *vers); |
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int (*open)(struct tee_context *ctx); |
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void (*release)(struct tee_context *ctx); |
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int (*open_session)(struct tee_context *ctx, |
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struct tee_ioctl_open_session_arg *arg, |
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struct tee_param *param); |
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int (*close_session)(struct tee_context *ctx, u32 session); |
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int (*invoke_func)(struct tee_context *ctx, |
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struct tee_ioctl_invoke_arg *arg, |
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struct tee_param *param); |
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int (*cancel_req)(struct tee_context *ctx, u32 cancel_id, u32 session); |
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int (*supp_recv)(struct tee_context *ctx, u32 *func, u32 *num_params, |
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struct tee_param *param); |
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int (*supp_send)(struct tee_context *ctx, u32 ret, u32 num_params, |
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struct tee_param *param); |
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int (*shm_register)(struct tee_context *ctx, struct tee_shm *shm, |
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struct page **pages, size_t num_pages, |
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unsigned long start); |
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int (*shm_unregister)(struct tee_context *ctx, struct tee_shm *shm); |
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}; |
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/** |
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* struct tee_desc - Describes the TEE driver to the subsystem |
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* @name: name of driver |
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* @ops: driver operations vtable |
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* @owner: module providing the driver |
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* @flags: Extra properties of driver, defined by TEE_DESC_* below |
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*/ |
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#define TEE_DESC_PRIVILEGED 0x1 |
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struct tee_desc { |
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const char *name; |
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const struct tee_driver_ops *ops; |
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struct module *owner; |
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u32 flags; |
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}; |
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/** |
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* tee_device_alloc() - Allocate a new struct tee_device instance |
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* @teedesc: Descriptor for this driver |
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* @dev: Parent device for this device |
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* @pool: Shared memory pool, NULL if not used |
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* @driver_data: Private driver data for this device |
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* |
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* Allocates a new struct tee_device instance. The device is |
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* removed by tee_device_unregister(). |
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* |
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* @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure |
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*/ |
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struct tee_device *tee_device_alloc(const struct tee_desc *teedesc, |
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struct device *dev, |
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struct tee_shm_pool *pool, |
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void *driver_data); |
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/** |
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* tee_device_register() - Registers a TEE device |
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* @teedev: Device to register |
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* |
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* tee_device_unregister() need to be called to remove the @teedev if |
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* this function fails. |
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* |
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* @returns < 0 on failure |
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*/ |
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int tee_device_register(struct tee_device *teedev); |
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/** |
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* tee_device_unregister() - Removes a TEE device |
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* @teedev: Device to unregister |
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* |
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* This function should be called to remove the @teedev even if |
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* tee_device_register() hasn't been called yet. Does nothing if |
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* @teedev is NULL. |
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*/ |
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void tee_device_unregister(struct tee_device *teedev); |
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/** |
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* tee_session_calc_client_uuid() - Calculates client UUID for session |
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* @uuid: Resulting UUID |
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* @connection_method: Connection method for session (TEE_IOCTL_LOGIN_*) |
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* @connectuon_data: Connection data for opening session |
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* |
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* Based on connection method calculates UUIDv5 based client UUID. |
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* |
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* For group based logins verifies that calling process has specified |
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* credentials. |
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* |
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* @return < 0 on failure |
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*/ |
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int tee_session_calc_client_uuid(uuid_t *uuid, u32 connection_method, |
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const u8 connection_data[TEE_IOCTL_UUID_LEN]); |
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/** |
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* struct tee_shm - shared memory object |
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* @ctx: context using the object |
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* @paddr: physical address of the shared memory |
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* @kaddr: virtual address of the shared memory |
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* @size: size of shared memory |
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* @offset: offset of buffer in user space |
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* @pages: locked pages from userspace |
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* @num_pages: number of locked pages |
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* @dmabuf: dmabuf used to for exporting to user space |
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* @flags: defined by TEE_SHM_* in tee_drv.h |
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* @id: unique id of a shared memory object on this device |
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* |
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* This pool is only supposed to be accessed directly from the TEE |
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* subsystem and from drivers that implements their own shm pool manager. |
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*/ |
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struct tee_shm { |
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struct tee_context *ctx; |
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phys_addr_t paddr; |
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void *kaddr; |
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size_t size; |
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unsigned int offset; |
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struct page **pages; |
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size_t num_pages; |
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struct dma_buf *dmabuf; |
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u32 flags; |
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int id; |
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}; |
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/** |
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* struct tee_shm_pool_mgr - shared memory manager |
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* @ops: operations |
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* @private_data: private data for the shared memory manager |
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*/ |
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struct tee_shm_pool_mgr { |
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const struct tee_shm_pool_mgr_ops *ops; |
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void *private_data; |
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}; |
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/** |
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* struct tee_shm_pool_mgr_ops - shared memory pool manager operations |
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* @alloc: called when allocating shared memory |
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* @free: called when freeing shared memory |
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* @destroy_poolmgr: called when destroying the pool manager |
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*/ |
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struct tee_shm_pool_mgr_ops { |
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int (*alloc)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm, |
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size_t size); |
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void (*free)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm); |
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void (*destroy_poolmgr)(struct tee_shm_pool_mgr *poolmgr); |
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}; |
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/** |
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* tee_shm_pool_alloc() - Create a shared memory pool from shm managers |
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* @priv_mgr: manager for driver private shared memory allocations |
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* @dmabuf_mgr: manager for dma-buf shared memory allocations |
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* |
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* Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied |
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* in @dmabuf, others will use the range provided by @priv. |
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* |
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* @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure. |
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*/ |
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struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr, |
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struct tee_shm_pool_mgr *dmabuf_mgr); |
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/* |
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* tee_shm_pool_mgr_alloc_res_mem() - Create a shm manager for reserved |
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* memory |
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* @vaddr: Virtual address of start of pool |
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* @paddr: Physical address of start of pool |
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* @size: Size in bytes of the pool |
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* |
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* @returns pointer to a 'struct tee_shm_pool_mgr' or an ERR_PTR on failure. |
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*/ |
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struct tee_shm_pool_mgr *tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr, |
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phys_addr_t paddr, |
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size_t size, |
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int min_alloc_order); |
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/** |
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* tee_shm_pool_mgr_destroy() - Free a shared memory manager |
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*/ |
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static inline void tee_shm_pool_mgr_destroy(struct tee_shm_pool_mgr *poolm) |
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{ |
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poolm->ops->destroy_poolmgr(poolm); |
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} |
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/** |
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* struct tee_shm_pool_mem_info - holds information needed to create a shared |
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* memory pool |
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* @vaddr: Virtual address of start of pool |
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* @paddr: Physical address of start of pool |
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* @size: Size in bytes of the pool |
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*/ |
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struct tee_shm_pool_mem_info { |
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unsigned long vaddr; |
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phys_addr_t paddr; |
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size_t size; |
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}; |
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/** |
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* tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved |
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* memory range |
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* @priv_info: Information for driver private shared memory pool |
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* @dmabuf_info: Information for dma-buf shared memory pool |
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* |
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* Start and end of pools will must be page aligned. |
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* |
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* Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied |
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* in @dmabuf, others will use the range provided by @priv. |
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* |
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* @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure. |
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*/ |
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struct tee_shm_pool * |
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tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info, |
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struct tee_shm_pool_mem_info *dmabuf_info); |
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/** |
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* tee_shm_pool_free() - Free a shared memory pool |
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* @pool: The shared memory pool to free |
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* |
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* The must be no remaining shared memory allocated from this pool when |
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* this function is called. |
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*/ |
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void tee_shm_pool_free(struct tee_shm_pool *pool); |
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/** |
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* tee_get_drvdata() - Return driver_data pointer |
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* @returns the driver_data pointer supplied to tee_register(). |
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*/ |
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void *tee_get_drvdata(struct tee_device *teedev); |
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/** |
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* tee_shm_alloc() - Allocate shared memory |
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* @ctx: Context that allocates the shared memory |
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* @size: Requested size of shared memory |
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* @flags: Flags setting properties for the requested shared memory. |
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* |
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* Memory allocated as global shared memory is automatically freed when the |
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* TEE file pointer is closed. The @flags field uses the bits defined by |
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* TEE_SHM_* above. TEE_SHM_MAPPED must currently always be set. If |
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* TEE_SHM_DMA_BUF global shared memory will be allocated and associated |
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* with a dma-buf handle, else driver private memory. |
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* |
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* @returns a pointer to 'struct tee_shm' |
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*/ |
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struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags); |
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/** |
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* tee_shm_register() - Register shared memory buffer |
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* @ctx: Context that registers the shared memory |
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* @addr: Address is userspace of the shared buffer |
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* @length: Length of the shared buffer |
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* @flags: Flags setting properties for the requested shared memory. |
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* |
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* @returns a pointer to 'struct tee_shm' |
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*/ |
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struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, |
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size_t length, u32 flags); |
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/** |
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* tee_shm_is_registered() - Check if shared memory object in registered in TEE |
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* @shm: Shared memory handle |
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* @returns true if object is registered in TEE |
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*/ |
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static inline bool tee_shm_is_registered(struct tee_shm *shm) |
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{ |
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return shm && (shm->flags & TEE_SHM_REGISTER); |
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} |
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/** |
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* tee_shm_free() - Free shared memory |
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* @shm: Handle to shared memory to free |
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*/ |
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void tee_shm_free(struct tee_shm *shm); |
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/** |
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* tee_shm_put() - Decrease reference count on a shared memory handle |
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* @shm: Shared memory handle |
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*/ |
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void tee_shm_put(struct tee_shm *shm); |
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/** |
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* tee_shm_va2pa() - Get physical address of a virtual address |
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* @shm: Shared memory handle |
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* @va: Virtual address to tranlsate |
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* @pa: Returned physical address |
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* @returns 0 on success and < 0 on failure |
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*/ |
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int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa); |
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/** |
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* tee_shm_pa2va() - Get virtual address of a physical address |
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* @shm: Shared memory handle |
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* @pa: Physical address to tranlsate |
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* @va: Returned virtual address |
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* @returns 0 on success and < 0 on failure |
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*/ |
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int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va); |
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/** |
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* tee_shm_get_va() - Get virtual address of a shared memory plus an offset |
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* @shm: Shared memory handle |
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* @offs: Offset from start of this shared memory |
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* @returns virtual address of the shared memory + offs if offs is within |
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* the bounds of this shared memory, else an ERR_PTR |
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*/ |
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void *tee_shm_get_va(struct tee_shm *shm, size_t offs); |
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/** |
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* tee_shm_get_pa() - Get physical address of a shared memory plus an offset |
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* @shm: Shared memory handle |
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* @offs: Offset from start of this shared memory |
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* @pa: Physical address to return |
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* @returns 0 if offs is within the bounds of this shared memory, else an |
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* error code. |
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*/ |
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int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa); |
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/** |
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* tee_shm_get_size() - Get size of shared memory buffer |
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* @shm: Shared memory handle |
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* @returns size of shared memory |
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*/ |
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static inline size_t tee_shm_get_size(struct tee_shm *shm) |
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{ |
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return shm->size; |
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} |
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/** |
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* tee_shm_get_pages() - Get list of pages that hold shared buffer |
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* @shm: Shared memory handle |
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* @num_pages: Number of pages will be stored there |
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* @returns pointer to pages array |
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*/ |
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static inline struct page **tee_shm_get_pages(struct tee_shm *shm, |
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size_t *num_pages) |
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{ |
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*num_pages = shm->num_pages; |
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return shm->pages; |
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} |
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/** |
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* tee_shm_get_page_offset() - Get shared buffer offset from page start |
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* @shm: Shared memory handle |
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* @returns page offset of shared buffer |
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*/ |
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static inline size_t tee_shm_get_page_offset(struct tee_shm *shm) |
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{ |
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return shm->offset; |
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} |
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/** |
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* tee_shm_get_id() - Get id of a shared memory object |
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* @shm: Shared memory handle |
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* @returns id |
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*/ |
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static inline int tee_shm_get_id(struct tee_shm *shm) |
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{ |
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return shm->id; |
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} |
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/** |
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* tee_shm_get_from_id() - Find shared memory object and increase reference |
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* count |
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* @ctx: Context owning the shared memory |
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* @id: Id of shared memory object |
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* @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure |
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*/ |
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struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id); |
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|
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/** |
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* tee_client_open_context() - Open a TEE context |
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* @start: if not NULL, continue search after this context |
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* @match: function to check TEE device |
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* @data: data for match function |
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* @vers: if not NULL, version data of TEE device of the context returned |
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* |
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* This function does an operation similar to open("/dev/teeX") in user space. |
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* A returned context must be released with tee_client_close_context(). |
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* |
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* Returns a TEE context of the first TEE device matched by the match() |
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* callback or an ERR_PTR. |
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*/ |
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struct tee_context * |
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tee_client_open_context(struct tee_context *start, |
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int (*match)(struct tee_ioctl_version_data *, |
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const void *), |
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const void *data, struct tee_ioctl_version_data *vers); |
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|
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/** |
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* tee_client_close_context() - Close a TEE context |
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* @ctx: TEE context to close |
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* |
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* Note that all sessions previously opened with this context will be |
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* closed when this function is called. |
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*/ |
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void tee_client_close_context(struct tee_context *ctx); |
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|
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/** |
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* tee_client_get_version() - Query version of TEE |
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* @ctx: TEE context to TEE to query |
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* @vers: Pointer to version data |
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*/ |
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void tee_client_get_version(struct tee_context *ctx, |
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struct tee_ioctl_version_data *vers); |
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|
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/** |
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* tee_client_open_session() - Open a session to a Trusted Application |
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* @ctx: TEE context |
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* @arg: Open session arguments, see description of |
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* struct tee_ioctl_open_session_arg |
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* @param: Parameters passed to the Trusted Application |
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* |
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* Returns < 0 on error else see @arg->ret for result. If @arg->ret |
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* is TEEC_SUCCESS the session identifier is available in @arg->session. |
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*/ |
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int tee_client_open_session(struct tee_context *ctx, |
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struct tee_ioctl_open_session_arg *arg, |
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struct tee_param *param); |
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|
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/** |
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* tee_client_close_session() - Close a session to a Trusted Application |
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* @ctx: TEE Context |
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* @session: Session id |
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* |
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* Return < 0 on error else 0, regardless the session will not be |
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* valid after this function has returned. |
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*/ |
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int tee_client_close_session(struct tee_context *ctx, u32 session); |
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|
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/** |
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* tee_client_invoke_func() - Invoke a function in a Trusted Application |
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* @ctx: TEE Context |
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* @arg: Invoke arguments, see description of |
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* struct tee_ioctl_invoke_arg |
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* @param: Parameters passed to the Trusted Application |
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* |
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* Returns < 0 on error else see @arg->ret for result. |
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*/ |
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int tee_client_invoke_func(struct tee_context *ctx, |
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struct tee_ioctl_invoke_arg *arg, |
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struct tee_param *param); |
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|
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/** |
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* tee_client_cancel_req() - Request cancellation of the previous open-session |
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* or invoke-command operations in a Trusted Application |
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* @ctx: TEE Context |
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* @arg: Cancellation arguments, see description of |
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* struct tee_ioctl_cancel_arg |
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* |
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* Returns < 0 on error else 0 if the cancellation was successfully requested. |
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*/ |
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int tee_client_cancel_req(struct tee_context *ctx, |
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struct tee_ioctl_cancel_arg *arg); |
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|
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static inline bool tee_param_is_memref(struct tee_param *param) |
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{ |
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switch (param->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) { |
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT: |
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case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT: |
|
case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT: |
|
return true; |
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default: |
|
return false; |
|
} |
|
} |
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|
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extern struct bus_type tee_bus_type; |
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|
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/** |
|
* struct tee_client_device - tee based device |
|
* @id: device identifier |
|
* @dev: device structure |
|
*/ |
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struct tee_client_device { |
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struct tee_client_device_id id; |
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struct device dev; |
|
}; |
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|
|
#define to_tee_client_device(d) container_of(d, struct tee_client_device, dev) |
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|
|
/** |
|
* struct tee_client_driver - tee client driver |
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* @id_table: device id table supported by this driver |
|
* @driver: driver structure |
|
*/ |
|
struct tee_client_driver { |
|
const struct tee_client_device_id *id_table; |
|
struct device_driver driver; |
|
}; |
|
|
|
#define to_tee_client_driver(d) \ |
|
container_of(d, struct tee_client_driver, driver) |
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|
|
#endif /*__TEE_DRV_H*/
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|
|