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crypto: ccp - Add support for getting and setting DBC parameters

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After software has authenticated a dynamic boost control request,
it can fetch and set supported parameters using a selection of messages.

Add support for these messages and export the ability to do this to
userspace.

Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mario Limonciello 2023-06-23 08:49:57 -05:00 committed by Herbert Xu
parent d9408716d2
commit e2cfe05e92
4 changed files with 109 additions and 0 deletions
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41
drivers/crypto/ccp/dbc.c
View file

@ -74,6 +74,30 @@ static int send_dbc_nonce(struct psp_dbc_device *dbc_dev)
return ret;
}
static int send_dbc_parameter(struct psp_dbc_device *dbc_dev)
{
dbc_dev->mbox->req.header.payload_size = sizeof(dbc_dev->mbox->dbc_param);
switch (dbc_dev->mbox->dbc_param.user.msg_index) {
case PARAM_SET_FMAX_CAP:
case PARAM_SET_PWR_CAP:
case PARAM_SET_GFX_MODE:
return send_dbc_cmd(dbc_dev, PSP_DYNAMIC_BOOST_SET_PARAMETER);
case PARAM_GET_FMAX_CAP:
case PARAM_GET_PWR_CAP:
case PARAM_GET_CURR_TEMP:
case PARAM_GET_FMAX_MAX:
case PARAM_GET_FMAX_MIN:
case PARAM_GET_SOC_PWR_MAX:
case PARAM_GET_SOC_PWR_MIN:
case PARAM_GET_SOC_PWR_CUR:
case PARAM_GET_GFX_MODE:
return send_dbc_cmd(dbc_dev, PSP_DYNAMIC_BOOST_GET_PARAMETER);
}
return -EINVAL;
}
void dbc_dev_destroy(struct psp_device *psp)
{
struct psp_dbc_device *dbc_dev = psp->dbc_data;
@ -135,6 +159,23 @@ static long dbc_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
goto unlock;
}
break;
case DBCIOCPARAM:
if (copy_from_user(&dbc_dev->mbox->dbc_param.user, argp,
sizeof(struct dbc_user_param))) {
ret = -EFAULT;
goto unlock;
}
ret = send_dbc_parameter(dbc_dev);
if (ret)
goto unlock;
if (copy_to_user(argp, &dbc_dev->mbox->dbc_param.user,
sizeof(struct dbc_user_param))) {
ret = -EFAULT;
goto unlock;
}
break;
default:
ret = -EINVAL;

6
drivers/crypto/ccp/dbc.h
View file

@ -38,10 +38,16 @@ struct dbc_set_uid {
struct dbc_user_setuid user;
} __packed;
struct dbc_param {
struct psp_req_buffer_hdr header;
struct dbc_user_param user;
} __packed;
union dbc_buffer {
struct psp_request req;
struct dbc_nonce dbc_nonce;
struct dbc_set_uid dbc_set_uid;
struct dbc_param dbc_param;
};
void dbc_dev_destroy(struct psp_device *psp);

2
include/linux/psp-platform-access.h
View file

@ -10,6 +10,8 @@ enum psp_platform_access_msg {
PSP_I2C_REQ_BUS_CMD = 0x64,
PSP_DYNAMIC_BOOST_GET_NONCE,
PSP_DYNAMIC_BOOST_SET_UID,
PSP_DYNAMIC_BOOST_GET_PARAMETER,
PSP_DYNAMIC_BOOST_SET_PARAMETER,
};
struct psp_req_buffer_hdr {

60
include/uapi/linux/psp-dbc.h
View file

@ -45,6 +45,23 @@ struct dbc_user_setuid {
__u8 signature[DBC_SIG_SIZE];
} __packed;
/**
* struct dbc_user_param - Parameter exchange structure (input/output).
* @msg_index: Message indicating what parameter to set or get (input)
* @param: 4 byte parameter, units are message specific. (input/output)
* @signature: 32 byte signature.
* - When sending a message this is to be created by software
* using a previous nonce (input)
* - For interpreting results, this signature is updated by the
* PSP to allow software to validate the authenticity of the
* results.
*/
struct dbc_user_param {
__u32 msg_index;
__u32 param;
__u8 signature[DBC_SIG_SIZE];
} __packed;
/**
* Dynamic Boost Control (DBC) IOC
*
@ -84,4 +101,47 @@ struct dbc_user_setuid {
*/
#define DBCIOCUID _IOW(DBC_IOC_TYPE, 0x2, struct dbc_user_setuid)
/**
* DBCIOCPARAM - Set or get a parameter from the PSP.
* This request will only work after DBCIOCUID has successfully
* set the UID of the calling process.
* Whether the parameter is set or get is controlled by the
* message ID in the request.
* This command must be sent using a 32 byte signature built
* using the nonce fetched from DBCIOCNONCE.
* When the command succeeds, the 32 byte signature will be
* updated by the PSP for software to authenticate the results.
*/
#define DBCIOCPARAM _IOWR(DBC_IOC_TYPE, 0x3, struct dbc_user_param)
/**
* enum dbc_cmd_msg - Messages utilized by DBCIOCPARAM
* @PARAM_GET_FMAX_CAP: Get frequency cap (MHz)
* @PARAM_SET_FMAX_CAP: Set frequency cap (MHz)
* @PARAM_GET_PWR_CAP: Get socket power cap (mW)
* @PARAM_SET_PWR_CAP: Set socket power cap (mW)
* @PARAM_GET_GFX_MODE: Get graphics mode (0/1)
* @PARAM_SET_GFX_MODE: Set graphics mode (0/1)
* @PARAM_GET_CURR_TEMP: Get current temperature (degrees C)
* @PARAM_GET_FMAX_MAX: Get maximum allowed value for frequency (MHz)
* @PARAM_GET_FMAX_MIN: Get minimum allowed value for frequency (MHz)
* @PARAM_GET_SOC_PWR_MAX: Get maximum allowed value for SoC power (mw)
* @PARAM_GET_SOC_PWR_MIN: Get minimum allowed value for SoC power (mw)
* @PARAM_GET_SOC_PWR_CUR: Get current value for SoC Power (mW)
*/
enum dbc_cmd_msg {
PARAM_GET_FMAX_CAP = 0x3,
PARAM_SET_FMAX_CAP = 0x4,
PARAM_GET_PWR_CAP = 0x5,
PARAM_SET_PWR_CAP = 0x6,
PARAM_GET_GFX_MODE = 0x7,
PARAM_SET_GFX_MODE = 0x8,
PARAM_GET_CURR_TEMP = 0x9,
PARAM_GET_FMAX_MAX = 0xA,
PARAM_GET_FMAX_MIN = 0xB,
PARAM_GET_SOC_PWR_MAX = 0xC,
PARAM_GET_SOC_PWR_MIN = 0xD,
PARAM_GET_SOC_PWR_CUR = 0xE,
};
#endif /* __PSP_DBC_USER_H__ */