diff options
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/Kconfig | 33 | ||||
| -rw-r--r-- | drivers/firmware/Makefile | 2 | ||||
| -rw-r--r-- | drivers/firmware/qcom_qseecom.c | 120 | ||||
| -rw-r--r-- | drivers/firmware/qcom_qseecom_uefisecapp.c | 871 | ||||
| -rw-r--r-- | drivers/firmware/qcom_scm.c | 448 | ||||
| -rw-r--r-- | drivers/firmware/qcom_scm.h | 1 |
6 files changed, 1467 insertions, 8 deletions
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index b59e3041fd62..8c608be30060 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -226,6 +226,39 @@ config QCOM_SCM_DOWNLOAD_MODE_DEFAULT Say Y here to enable "download mode" by default. +config QCOM_QSEECOM + bool "Qualcomm QSEECOM interface driver" + depends on QCOM_SCM=y + select AUXILIARY_BUS + help + Various Qualcomm SoCs have a Secure Execution Environment (SEE) running + in the Trust Zone. This module provides an interface to that via the + QSEECOM mechanism, using SCM calls. + + The QSEECOM interface allows, among other things, access to applications + running in the SEE. An example of such an application is 'uefisecapp', + which is required to access UEFI variables on certain systems. If + selected, the interface will also attempt to detect and register client + devices for supported applications. + + Select Y here to enable the QSEECOM interface driver. + +config QCOM_QSEECOM_UEFISECAPP + bool "Qualcomm SEE UEFI Secure App client driver" + depends on QCOM_QSEECOM + depends on EFI + help + Various Qualcomm SoCs do not allow direct access to EFI variables. + Instead, these need to be accessed via the UEFI Secure Application + (uefisecapp), residing in the Secure Execution Environment (SEE). + + This module provides a client driver for uefisecapp, installing efivar + operations to allow the kernel accessing EFI variables, and via that also + provide user-space with access to EFI variables via efivarfs. + + Select Y here to provide access to EFI variables on the aforementioned + platforms. + config SYSFB bool select BOOT_VESA_SUPPORT diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile index 28fcddcd688f..d41b094a5e58 100644 --- a/drivers/firmware/Makefile +++ b/drivers/firmware/Makefile @@ -20,6 +20,8 @@ obj-$(CONFIG_RASPBERRYPI_FIRMWARE) += raspberrypi.o obj-$(CONFIG_FW_CFG_SYSFS) += qemu_fw_cfg.o obj-$(CONFIG_QCOM_SCM) += qcom-scm.o qcom-scm-objs += qcom_scm.o qcom_scm-smc.o qcom_scm-legacy.o +obj-$(CONFIG_QCOM_QSEECOM) += qcom_qseecom.o +obj-$(CONFIG_QCOM_QSEECOM_UEFISECAPP) += qcom_qseecom_uefisecapp.o obj-$(CONFIG_SYSFB) += sysfb.o obj-$(CONFIG_SYSFB_SIMPLEFB) += sysfb_simplefb.o obj-$(CONFIG_TI_SCI_PROTOCOL) += ti_sci.o diff --git a/drivers/firmware/qcom_qseecom.c b/drivers/firmware/qcom_qseecom.c new file mode 100644 index 000000000000..731e6d5719f9 --- /dev/null +++ b/drivers/firmware/qcom_qseecom.c @@ -0,0 +1,120 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for Qualcomm Secure Execution Environment (SEE) interface (QSEECOM). + * Responsible for setting up and managing QSEECOM client devices. + * + * Copyright (C) 2023 Maximilian Luz <luzmaximilian@gmail.com> + */ +#include <linux/auxiliary_bus.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/types.h> + +#include <linux/firmware/qcom/qcom_qseecom.h> +#include <linux/firmware/qcom/qcom_scm.h> + +struct qseecom_app_desc { + const char *app_name; + const char *dev_name; +}; + +static void qseecom_client_release(struct device *dev) +{ + struct qseecom_client *client; + + client = container_of(dev, struct qseecom_client, aux_dev.dev); + kfree(client); +} + +static void qseecom_client_remove(void *data) +{ + struct qseecom_client *client = data; + + auxiliary_device_delete(&client->aux_dev); + auxiliary_device_uninit(&client->aux_dev); +} + +static int qseecom_client_register(struct platform_device *qseecom_dev, + const struct qseecom_app_desc *desc) +{ + struct qseecom_client *client; + u32 app_id; + int ret; + + /* Try to find the app ID, skip device if not found */ + ret = qcom_scm_qseecom_app_get_id(desc->app_name, &app_id); + if (ret) + return ret == -ENOENT ? 0 : ret; + + dev_info(&qseecom_dev->dev, "setting up client for %s\n", desc->app_name); + + /* Allocate and set-up the client device */ + client = kzalloc(sizeof(*client), GFP_KERNEL); + if (!client) + return -ENOMEM; + + client->aux_dev.name = desc->dev_name; + client->aux_dev.dev.parent = &qseecom_dev->dev; + client->aux_dev.dev.release = qseecom_client_release; + client->app_id = app_id; + + ret = auxiliary_device_init(&client->aux_dev); + if (ret) { + kfree(client); + return ret; + } + + ret = auxiliary_device_add(&client->aux_dev); + if (ret) { + auxiliary_device_uninit(&client->aux_dev); + return ret; + } + + ret = devm_add_action_or_reset(&qseecom_dev->dev, qseecom_client_remove, client); + if (ret) + return ret; + + return 0; +} + +/* + * List of supported applications. One client device will be created per entry, + * assuming the app has already been loaded (usually by firmware bootloaders) + * and its ID can be queried successfully. + */ +static const struct qseecom_app_desc qcom_qseecom_apps[] = { + { "qcom.tz.uefisecapp", "uefisecapp" }, +}; + +static int qcom_qseecom_probe(struct platform_device *qseecom_dev) +{ + int ret; + int i; + + /* Set up client devices for each base application */ + for (i = 0; i < ARRAY_SIZE(qcom_qseecom_apps); i++) { + ret = qseecom_client_register(qseecom_dev, &qcom_qseecom_apps[i]); + if (ret) + return ret; + } + + return 0; +} + +static struct platform_driver qcom_qseecom_driver = { + .driver = { + .name = "qcom_qseecom", + }, + .probe = qcom_qseecom_probe, +}; + +static int __init qcom_qseecom_init(void) +{ + return platform_driver_register(&qcom_qseecom_driver); +} +subsys_initcall(qcom_qseecom_init); + +MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>"); +MODULE_DESCRIPTION("Driver for the Qualcomm SEE (QSEECOM) interface"); +MODULE_LICENSE("GPL"); diff --git a/drivers/firmware/qcom_qseecom_uefisecapp.c b/drivers/firmware/qcom_qseecom_uefisecapp.c new file mode 100644 index 000000000000..a33acdaf7b78 --- /dev/null +++ b/drivers/firmware/qcom_qseecom_uefisecapp.c @@ -0,0 +1,871 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Client driver for Qualcomm UEFI Secure Application (qcom.tz.uefisecapp). + * Provides access to UEFI variables on platforms where they are secured by the + * aforementioned Secure Execution Environment (SEE) application. + * + * Copyright (C) 2023 Maximilian Luz <luzmaximilian@gmail.com> + */ + +#include <linux/efi.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/ucs2_string.h> + +#include <linux/firmware/qcom/qcom_qseecom.h> + +/* -- Qualcomm "uefisecapp" interface definitions. -------------------------- */ + +/* Maximum length of name string with null-terminator */ +#define QSEE_MAX_NAME_LEN 1024 + +#define QSEE_CMD_UEFI(x) (0x8000 | (x)) +#define QSEE_CMD_UEFI_GET_VARIABLE QSEE_CMD_UEFI(0) +#define QSEE_CMD_UEFI_SET_VARIABLE QSEE_CMD_UEFI(1) +#define QSEE_CMD_UEFI_GET_NEXT_VARIABLE QSEE_CMD_UEFI(2) +#define QSEE_CMD_UEFI_QUERY_VARIABLE_INFO QSEE_CMD_UEFI(3) + +/** + * struct qsee_req_uefi_get_variable - Request for GetVariable command. + * @command_id: The ID of the command. Must be %QSEE_CMD_UEFI_GET_VARIABLE. + * @length: Length of the request in bytes, including this struct and any + * parameters (name, GUID) stored after it as well as any padding + * thereof for alignment. + * @name_offset: Offset from the start of this struct to where the variable + * name is stored (as utf-16 string), in bytes. + * @name_size: Size of the name parameter in bytes, including null-terminator. + * @guid_offset: Offset from the start of this struct to where the GUID + * parameter is stored, in bytes. + * @guid_size: Size of the GUID parameter in bytes, i.e. sizeof(efi_guid_t). + * @data_size: Size of the output buffer, in bytes. + */ +struct qsee_req_uefi_get_variable { + u32 command_id; + u32 length; + u32 name_offset; + u32 name_size; + u32 guid_offset; + u32 guid_size; + u32 data_size; +} __packed; + +/** + * struct qsee_rsp_uefi_get_variable - Response for GetVariable command. + * @command_id: The ID of the command. Should be %QSEE_CMD_UEFI_GET_VARIABLE. + * @length: Length of the response in bytes, including this struct and the + * returned data. + * @status: Status of this command. + * @attributes: EFI variable attributes. + * @data_offset: Offset from the start of this struct to where the data is + * stored, in bytes. + * @data_size: Size of the returned data, in bytes. In case status indicates + * that the buffer is too small, this will be the size required + * to store the EFI variable data. + */ +struct qsee_rsp_uefi_get_variable { + u32 command_id; + u32 length; + u32 status; + u32 attributes; + u32 data_offset; + u32 data_size; +} __packed; + +/** + * struct qsee_req_uefi_set_variable - Request for the SetVariable command. + * @command_id: The ID of the command. Must be %QSEE_CMD_UEFI_SET_VARIABLE. + * @length: Length of the request in bytes, including this struct and any + * parameters (name, GUID, data) stored after it as well as any + * padding thereof required for alignment. + * @name_offset: Offset from the start of this struct to where the variable + * name is stored (as utf-16 string), in bytes. + * @name_size: Size of the name parameter in bytes, including null-terminator. + * @guid_offset: Offset from the start of this struct to where the GUID + * parameter is stored, in bytes. + * @guid_size: Size of the GUID parameter in bytes, i.e. sizeof(efi_guid_t). + * @attributes: The EFI variable attributes to set for this variable. + * @data_offset: Offset from the start of this struct to where the EFI variable + * data is stored, in bytes. + * @data_size: Size of EFI variable data, in bytes. + * + */ +struct qsee_req_uefi_set_variable { + u32 command_id; + u32 length; + u32 name_offset; + u32 name_size; + u32 guid_offset; + u32 guid_size; + u32 attributes; + u32 data_offset; + u32 data_size; +} __packed; + +/** + * struct qsee_rsp_uefi_set_variable - Response for the SetVariable command. + * @command_id: The ID of the command. Should be %QSEE_CMD_UEFI_SET_VARIABLE. + * @length: The length of this response, i.e. the size of this struct in + * bytes. + * @status: Status of this command. + * @_unknown1: Unknown response field. + * @_unknown2: Unknown response field. + */ +struct qsee_rsp_uefi_set_variable { + u32 command_id; + u32 length; + u32 status; + u32 _unknown1; + u32 _unknown2; +} __packed; + +/** + * struct qsee_req_uefi_get_next_variable - Request for the + * GetNextVariableName command. + * @command_id: The ID of the command. Must be + * %QSEE_CMD_UEFI_GET_NEXT_VARIABLE. + * @length: Length of the request in bytes, including this struct and any + * parameters (name, GUID) stored after it as well as any padding + * thereof for alignment. + * @guid_offset: Offset from the start of this struct to where the GUID + * parameter is stored, in bytes. + * @guid_size: Size of the GUID parameter in bytes, i.e. sizeof(efi_guid_t). + * @name_offset: Offset from the start of this struct to where the variable + * name is stored (as utf-16 string), in bytes. + * @name_size: Size of the name parameter in bytes, including null-terminator. + */ +struct qsee_req_uefi_get_next_variable { + u32 command_id; + u32 length; + u32 guid_offset; + u32 guid_size; + u32 name_offset; + u32 name_size; +} __packed; + +/** + * struct qsee_rsp_uefi_get_next_variable - Response for the + * GetNextVariableName command. + * @command_id: The ID of the command. Should be + * %QSEE_CMD_UEFI_GET_NEXT_VARIABLE. + * @length: Length of the response in bytes, including this struct and any + * parameters (name, GUID) stored after it as well as any padding + * thereof for alignment. + * @status: Status of this command. + * @guid_offset: Offset from the start of this struct to where the GUID + * parameter is stored, in bytes. + * @guid_size: Size of the GUID parameter in bytes, i.e. sizeof(efi_guid_t). + * @name_offset: Offset from the start of this struct to where the variable + * name is stored (as utf-16 string), in bytes. + * @name_size: Size of the name parameter in bytes, including null-terminator. + */ +struct qsee_rsp_uefi_get_next_variable { + u32 command_id; + u32 length; + u32 status; + u32 guid_offset; + u32 guid_size; + u32 name_offset; + u32 name_size; +} __packed; + +/** + * struct qsee_req_uefi_query_variable_info - Response for the + * GetNextVariableName command. + * @command_id: The ID of the command. Must be + * %QSEE_CMD_UEFI_QUERY_VARIABLE_INFO. + * @length: The length of this request, i.e. the size of this struct in + * bytes. + * @attributes: The storage attributes to query the info for. + */ +struct qsee_req_uefi_query_variable_info { + u32 command_id; + u32 length; + u32 attributes; +} __packed; + +/** + * struct qsee_rsp_uefi_query_variable_info - Response for the + * GetNextVariableName command. + * @command_id: The ID of the command. Must be + * %QSEE_CMD_UEFI_QUERY_VARIABLE_INFO. + * @length: The length of this response, i.e. the size of this + * struct in bytes. + * @status: Status of this command. + * @_pad: Padding. + * @storage_space: Full storage space size, in bytes. + * @remaining_space: Free storage space available, in bytes. + * @max_variable_size: Maximum variable data size, in bytes. + */ +struct qsee_rsp_uefi_query_variable_info { + u32 command_id; + u32 length; + u32 status; + u32 _pad; + u64 storage_space; + u64 remaining_space; + u64 max_variable_size; +} __packed; + +/* -- Alignment helpers ----------------------------------------------------- */ + +/* + * Helper macro to ensure proper alignment of types (fields and arrays) when + * stored in some (contiguous) buffer. + * + * Note: The driver from which this one has been reverse-engineered expects an + * alignment of 8 bytes (64 bits) for GUIDs. Our definition of efi_guid_t, + * however, has an alignment of 4 byte (32 bits). So far, this seems to work + * fine here. See also the comment on the typedef of efi_guid_t. + */ +#define qcuefi_buf_align_fields(fields...) \ + ({ \ + size_t __len = 0; \ + fields \ + __len; \ + }) + +#define __field_impl(size, align, offset) \ + ({ \ + size_t *__offset = (offset); \ + size_t __aligned; \ + \ + __aligned = ALIGN(__len, align); \ + __len = __aligned + (size); \ + \ + if (__offset) \ + *__offset = __aligned; \ + }); + +#define __array_offs(type, count, offset) \ + __field_impl(sizeof(type) * (count), __alignof__(type), offset) + +#define __array(type, count) __array_offs(type, count, NULL) +#define __field_offs(type, offset) __array_offs(type, 1, offset) +#define __field(type) __array_offs(type, 1, NULL) + +/* -- UEFI app interface. --------------------------------------------------- */ + +struct qcuefi_client { + struct qseecom_client *client; + struct efivars efivars; +}; + +static struct device *qcuefi_dev(struct qcuefi_client *qcuefi) +{ + return &qcuefi->client->aux_dev.dev; +} + +static efi_status_t qsee_uefi_status_to_efi(u32 status) +{ + u64 category = status & 0xf0000000; + u64 code = status & 0x0fffffff; + + return category << (BITS_PER_LONG - 32) | code; +} + +static efi_status_t qsee_uefi_get_variable(struct qcuefi_client *qcuefi, const efi_char16_t *name, + const efi_guid_t *guid, u32 *attributes, + unsigned long *data_size, void *data) +{ + struct qsee_req_uefi_get_variable *req_data; + struct qsee_rsp_uefi_get_variable *rsp_data; + unsigned long buffer_size = *data_size; + efi_status_t efi_status = EFI_SUCCESS; + unsigned long name_length; + size_t guid_offs; + size_t name_offs; + size_t req_size; + size_t rsp_size; + ssize_t status; + + if (!name || !guid) + return EFI_INVALID_PARAMETER; + + name_length = ucs2_strnlen(name, QSEE_MAX_NAME_LEN) + 1; + if (name_length > QSEE_MAX_NAME_LEN) + return EFI_INVALID_PARAMETER; + + if (buffer_size && !data) + return EFI_INVALID_PARAMETER; + + req_size = qcuefi_buf_align_fields( + __field(*req_data) + __array_offs(*name, name_length, &name_offs) + __field_offs(*guid, &guid_offs) + ); + + rsp_size = qcuefi_buf_align_fields( + __field(*rsp_data) + __array(u8, buffer_size) + ); + + req_data = kzalloc(req_size, GFP_KERNEL); + if (!req_data) { + efi_status = EFI_OUT_OF_RESOURCES; + goto out; + } + + rsp_data = kzalloc(rsp_size, GFP_KERNEL); + if (!rsp_data) { + efi_status = EFI_OUT_OF_RESOURCES; + goto out_free_req; + } + + req_data->command_id = QSEE_CMD_UEFI_GET_VARIABLE; + req_data->data_size = buffer_size; + req_data->name_offset = name_offs; + req_data->name_size = name_length * sizeof(*name); + req_data->guid_offset = guid_offs; + req_data->guid_size = sizeof(*guid); + req_data->length = req_size; + + status = ucs2_strscpy(((void *)req_data) + req_data->name_offset, name, name_length); + if (status < 0) + return EFI_INVALID_PARAMETER; + + memcpy(((void *)req_data) + req_data->guid_offset, guid, req_data->guid_size); + + status = qcom_qseecom_app_send(qcuefi->client, req_data, req_size, rsp_data, rsp_size); + if (status) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->command_id != QSEE_CMD_UEFI_GET_VARIABLE) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->length < sizeof(*rsp_data)) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->status) { + dev_dbg(qcuefi_dev(qcuefi), "%s: uefisecapp error: 0x%x\n", + __func__, rsp_data->status); + efi_status = qsee_uefi_status_to_efi(rsp_data->status); + + /* Update size and attributes in case buffer is too small. */ + if (efi_status == EFI_BUFFER_TOO_SMALL) { + *data_size = rsp_data->data_size; + if (attributes) + *attributes = rsp_data->attributes; + } + + goto out_free; + } + + if (rsp_data->length > rsp_size) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->data_offset + rsp_data->data_size > rsp_data->length) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + /* + * Note: We need to set attributes and data size even if the buffer is + * too small and we won't copy any data. This is described in spec, so + * that callers can either allocate a buffer properly (with two calls + * to this function) or just read back attributes withouth having to + * deal with that. + * + * Specifically: + * - If we have a buffer size of zero and no buffer, just return the + * attributes, required size, and indicate success. + * - If the buffer size is nonzero but too small, indicate that as an + * error. + * - Otherwise, we are good to copy the data. + * + * Note that we have already ensured above that the buffer pointer is + * non-NULL if its size is nonzero. + */ + *data_size = rsp_data->data_size; + if (attributes) + *attributes = rsp_data->attributes; + + if (buffer_size == 0 && !data) { + efi_status = EFI_SUCCESS; + goto out_free; + } + + if (buffer_size < rsp_data->data_size) { + efi_status = EFI_BUFFER_TOO_SMALL; + goto out_free; + } + + memcpy(data, ((void *)rsp_data) + rsp_data->data_offset, rsp_data->data_size); + +out_free: + kfree(rsp_data); +out_free_req: + kfree(req_data); +out: + return efi_status; +} + +static efi_status_t qsee_uefi_set_variable(struct qcuefi_client *qcuefi, const efi_char16_t *name, + const efi_guid_t *guid, u32 attributes, + unsigned long data_size, const void *data) +{ + struct qsee_req_uefi_set_variable *req_data; + struct qsee_rsp_uefi_set_variable *rsp_data; + efi_status_t efi_status = EFI_SUCCESS; + unsigned long name_length; + size_t name_offs; + size_t guid_offs; + size_t data_offs; + size_t req_size; + ssize_t status; + + if (!name || !guid) + return EFI_INVALID_PARAMETER; + + name_length = ucs2_strnlen(name, QSEE_MAX_NAME_LEN) + 1; + if (name_length > QSEE_MAX_NAME_LEN) + return EFI_INVALID_PARAMETER; + + /* + * Make sure we have some data if data_size is nonzero. Note that using + * a size of zero is a valid use-case described in spec and deletes the + * variable. + */ + if (data_size && !data) + return EFI_INVALID_PARAMETER; + + req_size = qcuefi_buf_align_fields( + __field(*req_data) + __array_offs(*name, name_length, &name_offs) + __field_offs(*guid, &guid_offs) + __array_offs(u8, data_size, &data_offs) + ); + + req_data = kzalloc(req_size, GFP_KERNEL); + if (!req_data) { + efi_status = EFI_OUT_OF_RESOURCES; + goto out; + } + + rsp_data = kzalloc(sizeof(*rsp_data), GFP_KERNEL); + if (!rsp_data) { + efi_status = EFI_OUT_OF_RESOURCES; + goto out_free_req; + } + + req_data->command_id = QSEE_CMD_UEFI_SET_VARIABLE; + req_data->attributes = attributes; + req_data->name_offset = name_offs; + req_data->name_size = name_length * sizeof(*name); + req_data->guid_offset = guid_offs; + req_data->guid_size = sizeof(*guid); + req_data->data_offset = data_offs; + req_data->data_size = data_size; + req_data->length = req_size; + + status = ucs2_strscpy(((void *)req_data) + req_data->name_offset, name, name_length); + if (status < 0) + return EFI_INVALID_PARAMETER; + + memcpy(((void *)req_data) + req_data->guid_offset, guid, req_data->guid_size); + + if (data_size) + memcpy(((void *)req_data) + req_data->data_offset, data, req_data->data_size); + + status = qcom_qseecom_app_send(qcuefi->client, req_data, req_size, rsp_data, + sizeof(*rsp_data)); + if (status) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->command_id != QSEE_CMD_UEFI_SET_VARIABLE) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->length != sizeof(*rsp_data)) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->status) { + dev_dbg(qcuefi_dev(qcuefi), "%s: uefisecapp error: 0x%x\n", + __func__, rsp_data->status); + efi_status = qsee_uefi_status_to_efi(rsp_data->status); + } + +out_free: + kfree(rsp_data); +out_free_req: + kfree(req_data); +out: + return efi_status; +} + +static efi_status_t qsee_uefi_get_next_variable(struct qcuefi_client *qcuefi, + unsigned long *name_size, efi_char16_t *name, + efi_guid_t *guid) +{ + struct qsee_req_uefi_get_next_variable *req_data; + struct qsee_rsp_uefi_get_next_variable *rsp_data; + efi_status_t efi_status = EFI_SUCCESS; + size_t guid_offs; + size_t name_offs; + size_t req_size; + size_t rsp_size; + ssize_t status; + + if (!name_size || !name || !guid) + return EFI_INVALID_PARAMETER; + + if (*name_size == 0) + return EFI_INVALID_PARAMETER; + + req_size = qcuefi_buf_align_fields( + __field(*req_data) + __field_offs(*guid, &guid_offs) + __array_offs(*name, *name_size / sizeof(*name), &name_offs) + ); + + rsp_size = qcuefi_buf_align_fields( + __field(*rsp_data) + __field(*guid) + __array(*name, *name_size / sizeof(*name)) + ); + + req_data = kzalloc(req_size, GFP_KERNEL); + if (!req_data) { + efi_status = EFI_OUT_OF_RESOURCES; + goto out; + } + + rsp_data = kzalloc(rsp_size, GFP_KERNEL); + if (!rsp_data) { + efi_status = EFI_OUT_OF_RESOURCES; + goto out_free_req; + } + + req_data->command_id = QSEE_CMD_UEFI_GET_NEXT_VARIABLE; + req_data->guid_offset = guid_offs; + req_data->guid_size = sizeof(*guid); + req_data->name_offset = name_offs; + req_data->name_size = *name_size; + req_data->length = req_size; + + memcpy(((void *)req_data) + req_data->guid_offset, guid, req_data->guid_size); + status = ucs2_strscpy(((void *)req_data) + req_data->name_offset, name, + *name_size / sizeof(*name)); + if (status < 0) + return EFI_INVALID_PARAMETER; + + status = qcom_qseecom_app_send(qcuefi->client, req_data, req_size, rsp_data, rsp_size); + if (status) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->command_id != QSEE_CMD_UEFI_GET_NEXT_VARIABLE) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->length < sizeof(*rsp_data)) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->status) { + dev_dbg(qcuefi_dev(qcuefi), "%s: uefisecapp error: 0x%x\n", + __func__, rsp_data->status); + efi_status = qsee_uefi_status_to_efi(rsp_data->status); + + /* + * If the buffer to hold the name is too small, update the + * name_size with the required size, so that callers can + * reallocate it accordingly. + */ + if (efi_status == EFI_BUFFER_TOO_SMALL) + *name_size = rsp_data->name_size; + + goto out_free; + } + + if (rsp_data->length > rsp_size) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->name_offset + rsp_data->name_size > rsp_data->length) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->guid_offset + rsp_data->guid_size > rsp_data->length) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->name_size > *name_size) { + *name_size = rsp_data->name_size; + efi_status = EFI_BUFFER_TOO_SMALL; + goto out_free; + } + + if (rsp_data->guid_size != sizeof(*guid)) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + memcpy(guid, ((void *)rsp_data) + rsp_data->guid_offset, rsp_data->guid_size); + status = ucs2_strscpy(name, ((void *)rsp_data) + rsp_data->name_offset, + rsp_data->name_size / sizeof(*name)); + *name_size = rsp_data->name_size; + + if (status < 0) { + /* + * Return EFI_DEVICE_ERROR here because the buffer size should + * have already been validated above, causing this function to + * bail with EFI_BUFFER_TOO_SMALL. + */ + return EFI_DEVICE_ERROR; + } + +out_free: + kfree(rsp_data); +out_free_req: + kfree(req_data); +out: + return efi_status; +} + +static efi_status_t qsee_uefi_query_variable_info(struct qcuefi_client *qcuefi, u32 attr, + u64 *storage_space, u64 *remaining_space, + u64 *max_variable_size) +{ + struct qsee_req_uefi_query_variable_info *req_data; + struct qsee_rsp_uefi_query_variable_info *rsp_data; + efi_status_t efi_status = EFI_SUCCESS; + int status; + + req_data = kzalloc(sizeof(*req_data), GFP_KERNEL); + if (!req_data) { + efi_status = EFI_OUT_OF_RESOURCES; + goto out; + } + + rsp_data = kzalloc(sizeof(*rsp_data), GFP_KERNEL); + if (!rsp_data) { + efi_status = EFI_OUT_OF_RESOURCES; + goto out_free_req; + } + + req_data->command_id = QSEE_CMD_UEFI_QUERY_VARIABLE_INFO; + req_data->attributes = attr; + req_data->length = sizeof(*req_data); + + status = qcom_qseecom_app_send(qcuefi->client, req_data, sizeof(*req_data), rsp_data, + sizeof(*rsp_data)); + if (status) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->command_id != QSEE_CMD_UEFI_QUERY_VARIABLE_INFO) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->length != sizeof(*rsp_data)) { + efi_status = EFI_DEVICE_ERROR; + goto out_free; + } + + if (rsp_data->status) { + dev_dbg(qcuefi_dev(qcuefi), "%s: uefisecapp error: 0x%x\n", + __func__, rsp_data->status); + efi_status = qsee_uefi_status_to_efi(rsp_data->status); + goto out_free; + } + + if (storage_space) + *storage_space = rsp_data->storage_space; + + if (remaining_space) + *remaining_space = rsp_data->remaining_space; + + if (max_variable_size) + *max_variable_size = rsp_data->max_variable_size; + +out_free: + kfree(rsp_data); +out_free_req: + kfree(req_data); +out: + return efi_status; +} + +/* -- Global efivar interface. ---------------------------------------------- */ + +static struct qcuefi_client *__qcuefi; +static DEFINE_MUTEX(__qcuefi_lock); + +static int qcuefi_set_reference(struct qcuefi_client *qcuefi) +{ + mutex_lock(&__qcuefi_lock); + + if (qcuefi && __qcuefi) { + mutex_unlock(&__qcuefi_lock); + return -EEXIST; + } + + __qcuefi = qcuefi; + + mutex_unlock(&__qcuefi_lock); + return 0; +} + +static struct qcuefi_client *qcuefi_acquire(void) +{ + mutex_lock(&__qcuefi_lock); + return __qcuefi; +} + +static void qcuefi_release(void) +{ + mutex_unlock(&__qcuefi_lock); +} + +static efi_status_t qcuefi_get_variable(efi_char16_t *name, efi_guid_t *vendor, u32 *attr, + unsigned long *data_size, void *data) +{ + struct qcuefi_client *qcuefi; + efi_status_t status; + + qcuefi = qcuefi_acquire(); + if (!qcuefi) + return EFI_NOT_READY; + + status = qsee_uefi_get_variable(qcuefi, name, vendor, attr, data_size, data); + + qcuefi_release(); + return status; +} + +static efi_status_t qcuefi_set_variable(efi_char16_t *name, efi_guid_t *vendor, + u32 attr, unsigned long data_size, void *data) +{ + struct qcuefi_client *qcuefi; + efi_status_t status; + + qcuefi = qcuefi_acquire(); + if (!qcuefi) + return EFI_NOT_READY; + + status = qsee_uefi_set_variable(qcuefi, name, vendor, attr, data_size, data); + + qcuefi_release(); + return status; +} + +static efi_status_t qcuefi_get_next_variable(unsigned long *name_size, efi_char16_t *name, + efi_guid_t *vendor) +{ + struct qcuefi_client *qcuefi; + efi_status_t status; + + qcuefi = qcuefi_acquire(); + if (!qcuefi) + return EFI_NOT_READY; + + status = qsee_uefi_get_next_variable(qcuefi, name_size, name, vendor); + + qcuefi_release(); + return status; +} + +static efi_status_t qcuefi_query_variable_info(u32 attr, u64 *storage_space, u64 *remaining_space, + u64 *max_variable_size) +{ + struct qcuefi_client *qcuefi; + efi_status_t status; + + qcuefi = qcuefi_acquire(); + if (!qcuefi) + return EFI_NOT_READY; + + status = qsee_uefi_query_variable_info(qcuefi, attr, storage_space, remaining_space, + max_variable_size); + + qcuefi_release(); + return status; +} + +static const struct efivar_operations qcom_efivar_ops = { + .get_variable = qcuefi_get_variable, + .set_variable = qcuefi_set_variable, + .get_next_variable = qcuefi_get_next_variable, + .query_variable_info = qcuefi_query_variable_info, +}; + +/* -- Driver setup. --------------------------------------------------------- */ + +static int qcom_uefisecapp_probe(struct auxiliary_device *aux_dev, + const struct auxiliary_device_id *aux_dev_id) +{ + struct qcuefi_client *qcuefi; + int status; + + qcuefi = devm_kzalloc(&aux_dev->dev, sizeof(*qcuefi), GFP_KERNEL); + if (!qcuefi) + return -ENOMEM; + + qcuefi->client = container_of(aux_dev, struct qseecom_client, aux_dev); + + auxiliary_set_drvdata(aux_dev, qcuefi); + status = qcuefi_set_reference(qcuefi); + if (status) + return status; + + status = efivars_register(&qcuefi->efivars, &qcom_efivar_ops); + if (status) + qcuefi_set_reference(NULL); + + return status; +} + +static void qcom_uefisecapp_remove(struct auxiliary_device *aux_dev) +{ + struct qcuefi_client *qcuefi = auxiliary_get_drvdata(aux_dev); + + efivars_unregister(&qcuefi->efivars); + qcuefi_set_reference(NULL); +} + +static const struct auxiliary_device_id qcom_uefisecapp_id_table[] = { + { .name = "qcom_qseecom.uefisecapp" }, + {} +}; +MODULE_DEVICE_TABLE(auxiliary, qcom_uefisecapp_id_table); + +static struct auxiliary_driver qcom_uefisecapp_driver = { + .probe = qcom_uefisecapp_probe, + .remove = qcom_uefisecapp_remove, + .id_table = qcom_uefisecapp_id_table, + .driver = { + .name = "qcom_qseecom_uefisecapp", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, +}; +module_auxiliary_driver(qcom_uefisecapp_driver); + +MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>"); +MODULE_DESCRIPTION("Client driver for Qualcomm SEE UEFI Secure App"); +MODULE_LICENSE("GPL"); diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c index 06fe8aca870d..520de9b5633a 100644 --- a/drivers/firmware/qcom_scm.c +++ b/drivers/firmware/qcom_scm.c @@ -2,24 +2,25 @@ /* Copyright (c) 2010,2015,2019 The Linux Foundation. All rights reserved. * Copyright (C) 2015 Linaro Ltd. */ -#include <linux/platform_device.h> -#include <linux/init.h> -#include <linux/interrupt.h> + +#include <linux/arm-smccc.h> +#include <linux/clk.h> #include <linux/completion.h> #include <linux/cpumask.h> -#include <linux/export.h> #include <linux/dma-mapping.h> +#include <linux/export.h> +#include <linux/firmware/qcom/qcom_scm.h> +#include <linux/init.h> #include <linux/interconnect.h> +#include <linux/interrupt.h> #include <linux/module.h> -#include <linux/types.h> -#include <linux/firmware/qcom/qcom_scm.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/of_platform.h> -#include <linux/clk.h> +#include <linux/platform_device.h> #include <linux/reset-controller.h> -#include <linux/arm-smccc.h> +#include <linux/types.h> #include "qcom_scm.h" @@ -55,6 +56,53 @@ struct qcom_scm_mem_map_info { __le64 mem_size; }; +/** + * struct qcom_scm_qseecom_resp - QSEECOM SCM call response. + * @result: Result or status of the SCM call. See &enum qcom_scm_qseecom_result. + * @resp_type: Type of the response. See &enum qcom_scm_qseecom_resp_type. + * @data: Response data. The type of this data is given in @resp_type. + */ +struct qcom_scm_qseecom_resp { + u64 result; + u64 resp_type; + u64 data; +}; + +enum qcom_scm_qseecom_result { + QSEECOM_RESULT_SUCCESS = 0, + QSEECOM_RESULT_INCOMPLETE = 1, + QSEECOM_RESULT_BLOCKED_ON_LISTENER = 2, + QSEECOM_RESULT_FAILURE = 0xFFFFFFFF, +}; + +enum qcom_scm_qseecom_resp_type { + QSEECOM_SCM_RES_APP_ID = 0xEE01, + QSEECOM_SCM_RES_QSEOS_LISTENER_ID = 0xEE02, +}; + +enum qcom_scm_qseecom_tz_owner { + QSEECOM_TZ_OWNER_SIP = 2, + QSEECOM_TZ_OWNER_TZ_APPS = 48, + QSEECOM_TZ_OWNER_QSEE_OS = 50 +}; + +enum qcom_scm_qseecom_tz_svc { + QSEECOM_TZ_SVC_APP_ID_PLACEHOLDER = 0, + QSEECOM_TZ_SVC_APP_MGR = 1, + QSEECOM_TZ_SVC_INFO = 6, +}; + +enum qcom_scm_qseecom_tz_cmd_app { + QSEECOM_TZ_CMD_APP_SEND = 1, + QSEECOM_TZ_CMD_APP_LOOKUP = 3, +}; + +enum qcom_scm_qseecom_tz_cmd_info { + QSEECOM_TZ_CMD_INFO_VERSION = 3, +}; + +#define QSEECOM_MAX_APP_NAME_SIZE 64 + /* Each bit configures cold/warm boot address for one of the 4 CPUs */ static const u8 qcom_scm_cpu_cold_bits[QCOM_SCM_BOOT_MAX_CPUS] = { 0, BIT(0), BIT(3), BIT(5) @@ -168,6 +216,12 @@ static enum qcom_scm_convention __get_convention(void) return qcom_scm_convention; /* + * Per the "SMC calling convention specification", the 64-bit calling + * convention can only be used when the client is 64-bit, otherwise + * system will encounter the undefined behaviour. + */ +#if IS_ENABLED(CONFIG_ARM64) + /* * Device isn't required as there is only one argument - no device * needed to dma_map_single to secure world */ @@ -187,6 +241,7 @@ static enum qcom_scm_convention __get_convention(void) forced = true; goto found; } +#endif probed_convention = SMC_CONVENTION_ARM_32; ret = __scm_smc_call(NULL, &desc, probed_convention, &res, true); @@ -403,6 +458,29 @@ int qcom_scm_set_remote_state(u32 state, u32 id) } EXPORT_SYMBOL_GPL(qcom_scm_set_remote_state); +static int qcom_scm_disable_sdi(void) +{ + int ret; + struct qcom_scm_desc desc = { + .svc = QCOM_SCM_SVC_BOOT, + .cmd = QCOM_SCM_BOOT_SDI_CONFIG, + .args[0] = 1, /* Disable watchdog debug */ + .args[1] = 0, /* Disable SDI */ + .arginfo = QCOM_SCM_ARGS(2), + .owner = ARM_SMCCC_OWNER_SIP, + }; + struct qcom_scm_res res; + + ret = qcom_scm_clk_enable(); + if (ret) + return ret; + ret = qcom_scm_call(__scm->dev, &desc, &res); + + qcom_scm_clk_disable(); + + return ret ? : res.result[0]; +} + static int __qcom_scm_set_dload_mode(struct device *dev, bool enable) { struct qcom_scm_desc desc = { @@ -1321,6 +1399,340 @@ static int qcom_scm_find_dload_address(struct device *dev, u64 *addr) return 0; } +#ifdef CONFIG_QCOM_QSEECOM + +/* Lock for QSEECOM SCM call executions */ +static DEFINE_MUTEX(qcom_scm_qseecom_call_lock); + +static int __qcom_scm_qseecom_call(const struct qcom_scm_desc *desc, + struct qcom_scm_qseecom_resp *res) +{ + struct qcom_scm_res scm_res = {}; + int status; + + /* + * QSEECOM SCM calls should not be executed concurrently. Therefore, we + * require the respective call lock to be held. + */ + lockdep_assert_held(&qcom_scm_qseecom_call_lock); + + status = qcom_scm_call(__scm->dev, desc, &scm_res); + + res->result = scm_res.result[0]; + res->resp_type = scm_res.result[1]; + res->data = scm_res.result[2]; + + if (status) + return status; + + return 0; +} + +/** + * qcom_scm_qseecom_call() - Perform a QSEECOM SCM call. + * @desc: SCM call descriptor. + * @res: SCM call response (output). + * + * Performs the QSEECOM SCM call described by @desc, returning the response in + * @rsp. + * + * Return: Zero on success, nonzero on failure. + */ +static int qcom_scm_qseecom_call(const struct qcom_scm_desc *desc, + struct qcom_scm_qseecom_resp *res) +{ + int status; + + /* + * Note: Multiple QSEECOM SCM calls should not be executed same time, + * so lock things here. This needs to be extended to callback/listener + * handling when support for that is implemented. + */ + + mutex_lock(&qcom_scm_qseecom_call_lock); + status = __qcom_scm_qseecom_call(desc, res); + mutex_unlock(&qcom_scm_qseecom_call_lock); + + dev_dbg(__scm->dev, "%s: owner=%x, svc=%x, cmd=%x, result=%lld, type=%llx, data=%llx\n", + __func__, desc->owner, desc->svc, desc->cmd, res->result, + res->resp_type, res->data); + + if (status) { + dev_err(__scm->dev, "qseecom: scm call failed with error %d\n", status); + return status; + } + + /* + * TODO: Handle incomplete and blocked calls: + * + * Incomplete and blocked calls are not supported yet. Some devices + * and/or commands require those, some don't. Let's warn about them + * prominently in case someone attempts to try these commands with a + * device/command combination that isn't supported yet. + */ + WARN_ON(res->result == QSEECOM_RESULT_INCOMPLETE); + WARN_ON(res->result == QSEECOM_RESULT_BLOCKED_ON_LISTENER); + + return 0; +} + +/** + * qcom_scm_qseecom_get_version() - Query the QSEECOM version. + * @version: Pointer where the QSEECOM version will be stored. + * + * Performs the QSEECOM SCM querying the QSEECOM version currently running in + * the TrustZone. + * + * Return: Zero on success, nonzero on failure. + */ +static int qcom_scm_qseecom_get_version(u32 *version) +{ + struct qcom_scm_desc desc = {}; + struct qcom_scm_qseecom_resp res = {}; + u32 feature = 10; + int ret; + + desc.owner = QSEECOM_TZ_OWNER_SIP; + desc.svc = QSEECOM_TZ_SVC_INFO; + desc.cmd = QSEECOM_TZ_CMD_INFO_VERSION; + desc.arginfo = QCOM_SCM_ARGS(1, QCOM_SCM_VAL); + desc.args[0] = feature; + + ret = qcom_scm_qseecom_call(&desc, &res); + if (ret) + return ret; + + *version = res.result; + return 0; +} + +/** + * qcom_scm_qseecom_app_get_id() - Query the app ID for a given QSEE app name. + * @app_name: The name of the app. + * @app_id: The returned app ID. + * + * Query and return the application ID of the SEE app identified by the given + * name. This returned ID is the unique identifier of the app required for + * subsequent communication. + * + * Return: Zero on success, nonzero on failure, -ENOENT if the app has not been + * loaded or could not be found. + */ +int qcom_scm_qseecom_app_get_id(const char *app_name, u32 *app_id) +{ + unsigned long name_buf_size = QSEECOM_MAX_APP_NAME_SIZE; + unsigned long app_name_len = strlen(app_name); + struct qcom_scm_desc desc = {}; + struct qcom_scm_qseecom_resp res = {}; + dma_addr_t name_buf_phys; + char *name_buf; + int status; + + if (app_name_len >= name_buf_size) + return -EINVAL; + + name_buf = kzalloc(name_buf_size, GFP_KERNEL); + if (!name_buf) + return -ENOMEM; + + memcpy(name_buf, app_name, app_name_len); + + name_buf_phys = dma_map_single(__scm->dev, name_buf, name_buf_size, DMA_TO_DEVICE); + status = dma_mapping_error(__scm->dev, name_buf_phys); + if (status) { + kfree(name_buf); + dev_err(__scm->dev, "qseecom: failed to map dma address\n"); + return status; + } + + desc.owner = QSEECOM_TZ_OWNER_QSEE_OS; + desc.svc = QSEECOM_TZ_SVC_APP_MGR; + desc.cmd = QSEECOM_TZ_CMD_APP_LOOKUP; + desc.arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_RW, QCOM_SCM_VAL); + desc.args[0] = name_buf_phys; + desc.args[1] = app_name_len; + + status = qcom_scm_qseecom_call(&desc, &res); + dma_unmap_single(__scm->dev, name_buf_phys, name_buf_size, DMA_TO_DEVICE); + kfree(name_buf); + + if (status) + return status; + + if (res.result == QSEECOM_RESULT_FAILURE) + return -ENOENT; + + if (res.result != QSEECOM_RESULT_SUCCESS) + return -EINVAL; + + if (res.resp_type != QSEECOM_SCM_RES_APP_ID) + return -EINVAL; + + *app_id = res.data; + return 0; +} +EXPORT_SYMBOL_GPL(qcom_scm_qseecom_app_get_id); + +/** + * qcom_scm_qseecom_app_send() - Send to and receive data from a given QSEE app. + * @app_id: The ID of the target app. + * @req: Request buffer sent to the app (must be DMA-mappable). + * @req_size: Size of the request buffer. + * @rsp: Response buffer, written to by the app (must be DMA-mappable). + * @rsp_size: Size of the response buffer. + * + * Sends a request to the QSEE app associated with the given ID and read back + * its response. The caller must provide two DMA memory regions, one for the + * request and one for the response, and fill out the @req region with the + * respective (app-specific) request data. The QSEE app reads this and returns + * its response in the @rsp region. + * + * Return: Zero on success, nonzero on failure. + */ +int qcom_scm_qseecom_app_send(u32 app_id, void *req, size_t req_size, void *rsp, + size_t rsp_size) +{ + struct qcom_scm_qseecom_resp res = {}; + struct qcom_scm_desc desc = {}; + dma_addr_t req_phys; + dma_addr_t rsp_phys; + int status; + + /* Map request buffer */ + req_phys = dma_map_single(__scm->dev, req, req_size, DMA_TO_DEVICE); + status = dma_mapping_error(__scm->dev, req_phys); + if (status) { + dev_err(__scm->dev, "qseecom: failed to map request buffer\n"); + return status; + } + + /* Map response buffer */ + rsp_phys = dma_map_single(__scm->dev, rsp, rsp_size, DMA_FROM_DEVICE); + status = dma_mapping_error(__scm->dev, rsp_phys); + if (status) { + dma_unmap_single(__scm->dev, req_phys, req_size, DMA_TO_DEVICE); + dev_err(__scm->dev, "qseecom: failed to map response buffer\n"); + return status; + } + + /* Set up SCM call data */ + desc.owner = QSEECOM_TZ_OWNER_TZ_APPS; + desc.svc = QSEECOM_TZ_SVC_APP_ID_PLACEHOLDER; + desc.cmd = QSEECOM_TZ_CMD_APP_SEND; + desc.arginfo = QCOM_SCM_ARGS(5, QCOM_SCM_VAL, + QCOM_SCM_RW, QCOM_SCM_VAL, + QCOM_SCM_RW, QCOM_SCM_VAL); + desc.args[0] = app_id; + desc.args[1] = req_phys; + desc.args[2] = req_size; + desc.args[3] = rsp_phys; + desc.args[4] = rsp_size; + + /* Perform call */ + status = qcom_scm_qseecom_call(&desc, &res); + + /* Unmap buffers */ + dma_unmap_single(__scm->dev, rsp_phys, rsp_size, DMA_FROM_DEVICE); + dma_unmap_single(__scm->dev, req_phys, req_size, DMA_TO_DEVICE); + + if (status) + return status; + + if (res.result != QSEECOM_RESULT_SUCCESS) + return -EIO; + + return 0; +} +EXPORT_SYMBOL_GPL(qcom_scm_qseecom_app_send); + +/* + * We do not yet support re-entrant calls via the qseecom interface. To prevent + + any potential issues with this, only allow validated machines for now. + */ +static const struct of_device_id qcom_scm_qseecom_allowlist[] = { + { .compatible = "lenovo,thinkpad-x13s", }, + { } +}; + +static bool qcom_scm_qseecom_machine_is_allowed(void) +{ + struct device_node *np; + bool match; + + np = of_find_node_by_path("/"); + if (!np) + return false; + + match = of_match_node(qcom_scm_qseecom_allowlist, np); + of_node_put(np); + + return match; +} + +static void qcom_scm_qseecom_free(void *data) +{ + struct platform_device *qseecom_dev = data; + + platform_device_del(qseecom_dev); + platform_device_put(qseecom_dev); +} + +static int qcom_scm_qseecom_init(struct qcom_scm *scm) +{ + struct platform_device *qseecom_dev; + u32 version; + int ret; + + /* + * Note: We do two steps of validation here: First, we try to query the + * QSEECOM version as a check to see if the interface exists on this + * device. Second, we check against known good devices due to current + * driver limitations (see comment in qcom_scm_qseecom_allowlist). + * + * Note that we deliberately do the machine check after the version + * check so that we can log potentially supported devices. This should + * be safe as downstream sources indicate that the version query is + * neither blocking nor reentrant. + */ + ret = qcom_scm_qseecom_get_version(&version); + if (ret) + return 0; + + dev_info(scm->dev, "qseecom: found qseecom with version 0x%x\n", version); + + if (!qcom_scm_qseecom_machine_is_allowed()) { + dev_info(scm->dev, "qseecom: untested machine, skipping\n"); + return 0; + } + + /* + * Set up QSEECOM interface device. All application clients will be + * set up and managed by the corresponding driver for it. + */ + qseecom_dev = platform_device_alloc("qcom_qseecom", -1); + if (!qseecom_dev) + return -ENOMEM; + + qseecom_dev->dev.parent = scm->dev; + + ret = platform_device_add(qseecom_dev); + if (ret) { + platform_device_put(qseecom_dev); + return ret; + } + + return devm_add_action_or_reset(scm->dev, qcom_scm_qseecom_free, qseecom_dev); +} + +#else /* CONFIG_QCOM_QSEECOM */ + +static int qcom_scm_qseecom_init(struct qcom_scm *scm) +{ + return 0; +} + +#endif /* CONFIG_QCOM_QSEECOM */ + /** * qcom_scm_is_available() - Checks if SCM is available */ @@ -1468,6 +1880,26 @@ static int qcom_scm_probe(struct platform_device *pdev) if (download_mode) qcom_scm_set_download_mode(true); + + /* + * Disable SDI if indicated by DT that it is enabled by default. + */ + if (of_property_read_bool(pdev->dev.of_node, "qcom,sdi-enabled")) + qcom_scm_disable_sdi(); + + /* + * Initialize the QSEECOM interface. + * + * Note: QSEECOM is fairly self-contained and this only adds the + * interface device (the driver of which does most of the heavy + * lifting). So any errors returned here should be either -ENOMEM or + * -EINVAL (with the latter only in case there's a bug in our code). + * This means that there is no need to bring down the whole SCM driver. + * Just log the error instead and let SCM live. + */ + ret = qcom_scm_qseecom_init(scm); + WARN(ret < 0, "failed to initialize qseecom: %d\n", ret); + return 0; } diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h index e6e512bd57d1..7b68fa820495 100644 --- a/drivers/firmware/qcom_scm.h +++ b/drivers/firmware/qcom_scm.h @@ -80,6 +80,7 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc, #define QCOM_SCM_SVC_BOOT 0x01 #define QCOM_SCM_BOOT_SET_ADDR 0x01 #define QCOM_SCM_BOOT_TERMINATE_PC 0x02 +#define QCOM_SCM_BOOT_SDI_CONFIG 0x09 #define QCOM_SCM_BOOT_SET_DLOAD_MODE 0x10 #define QCOM_SCM_BOOT_SET_ADDR_MC 0x11 #define QCOM_SCM_BOOT_SET_REMOTE_STATE 0x0a |