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linux-stable/drivers/firmware/qcom/qcom_qseecom_uefisecapp.c

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// 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.
*
* Note: It looks like uefisecapp is quite picky about how the memory passed to
* it is structured and aligned. In particular the request/response setup used
* for QSEE_CMD_UEFI_GET_VARIABLE. While qcom_qseecom_app_send(), in theory,
* accepts separate buffers/addresses for the request and response parts, in
* practice, however, it seems to expect them to be both part of a larger
* contiguous block. We initially allocated separate buffers for the request
* and response but this caused the QSEE_CMD_UEFI_GET_VARIABLE command to
* either not write any response to the response buffer or outright crash the
* device. Therefore, we now allocate a single contiguous block of DMA memory
* for both and properly align the data using the macros below. In particular,
* request and response structs are aligned at 8 byte (via __reqdata_offs()),
* following the driver that this has been reverse-engineered from.
*/
#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_offs_aligned(type, count, align, offset) \
__field_impl(sizeof(type) * (count), align, offset)
#define __reqdata_offs(size, offset) \
__array_offs_aligned(u8, size, 8, 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;
dma_addr_t cmd_buf_dma;
size_t cmd_buf_size;
void *cmd_buf;
size_t guid_offs;
size_t name_offs;
size_t req_size;
size_t rsp_size;
size_t req_offs;
size_t rsp_offs;
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)
);
cmd_buf_size = qcuefi_buf_align_fields(
__reqdata_offs(req_size, &req_offs)
__reqdata_offs(rsp_size, &rsp_offs)
);
cmd_buf = qseecom_dma_alloc(qcuefi->client, cmd_buf_size, &cmd_buf_dma, GFP_KERNEL);
if (!cmd_buf) {
efi_status = EFI_OUT_OF_RESOURCES;
goto out;
}
req_data = cmd_buf + req_offs;
rsp_data = cmd_buf + rsp_offs;
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) {
efi_status = EFI_INVALID_PARAMETER;
goto out_free;
}
memcpy(((void *)req_data) + req_data->guid_offset, guid, req_data->guid_size);
status = qcom_qseecom_app_send(qcuefi->client,
cmd_buf_dma + req_offs, req_size,
cmd_buf_dma + rsp_offs, 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:
qseecom_dma_free(qcuefi->client, cmd_buf_size, cmd_buf, cmd_buf_dma);
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;
dma_addr_t cmd_buf_dma;
size_t cmd_buf_size;
void *cmd_buf;
size_t name_offs;
size_t guid_offs;
size_t data_offs;
size_t req_size;
size_t req_offs;
size_t rsp_offs;
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)
);
cmd_buf_size = qcuefi_buf_align_fields(
__reqdata_offs(req_size, &req_offs)
__reqdata_offs(sizeof(*rsp_data), &rsp_offs)
);
cmd_buf = qseecom_dma_alloc(qcuefi->client, cmd_buf_size, &cmd_buf_dma, GFP_KERNEL);
if (!cmd_buf) {
efi_status = EFI_OUT_OF_RESOURCES;
goto out;
}
req_data = cmd_buf + req_offs;
rsp_data = cmd_buf + rsp_offs;
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) {
efi_status = EFI_INVALID_PARAMETER;
goto out_free;
}
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,
cmd_buf_dma + req_offs, req_size,
cmd_buf_dma + rsp_offs, 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:
qseecom_dma_free(qcuefi->client, cmd_buf_size, cmd_buf, cmd_buf_dma);
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;
dma_addr_t cmd_buf_dma;
size_t cmd_buf_size;
void *cmd_buf;
size_t guid_offs;
size_t name_offs;
size_t req_size;
size_t rsp_size;
size_t req_offs;
size_t rsp_offs;
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))
);
cmd_buf_size = qcuefi_buf_align_fields(
__reqdata_offs(req_size, &req_offs)
__reqdata_offs(rsp_size, &rsp_offs)
);
cmd_buf = qseecom_dma_alloc(qcuefi->client, cmd_buf_size, &cmd_buf_dma, GFP_KERNEL);
if (!cmd_buf) {
efi_status = EFI_OUT_OF_RESOURCES;
goto out;
}
req_data = cmd_buf + req_offs;
rsp_data = cmd_buf + rsp_offs;
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) {
efi_status = EFI_INVALID_PARAMETER;
goto out_free;
}
status = qcom_qseecom_app_send(qcuefi->client,
cmd_buf_dma + req_offs, req_size,
cmd_buf_dma + rsp_offs, 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.
*/
efi_status = EFI_DEVICE_ERROR;
}
out_free:
qseecom_dma_free(qcuefi->client, cmd_buf_size, cmd_buf, cmd_buf_dma);
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;
dma_addr_t cmd_buf_dma;
size_t cmd_buf_size;
void *cmd_buf;
size_t req_offs;
size_t rsp_offs;
int status;
cmd_buf_size = qcuefi_buf_align_fields(
__reqdata_offs(sizeof(*req_data), &req_offs)
__reqdata_offs(sizeof(*rsp_data), &rsp_offs)
);
cmd_buf = qseecom_dma_alloc(qcuefi->client, cmd_buf_size, &cmd_buf_dma, GFP_KERNEL);
if (!cmd_buf) {
efi_status = EFI_OUT_OF_RESOURCES;
goto out;
}
req_data = cmd_buf + req_offs;
rsp_data = cmd_buf + rsp_offs;
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,
cmd_buf_dma + req_offs, sizeof(*req_data),
cmd_buf_dma + rsp_offs, 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:
qseecom_dma_free(qcuefi->client, cmd_buf_size, cmd_buf, cmd_buf_dma);
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");
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