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

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>

2 files changed, 62 insertions, 0 deletions

diff --git a/include/linux/psp-platform-access.h b/include/linux/psp-platform-access.h
index 18b9e0f0cb03..c1dc87fc536b 100644
--- a/include/linux/psp-platform-access.h
+++ b/include/linux/psp-platform-access.h
@@ -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 {
diff --git a/include/uapi/linux/psp-dbc.h b/include/uapi/linux/psp-dbc.h
index 7443c78ede19..b3845a9ff5fd 100644
--- a/include/uapi/linux/psp-dbc.h
+++ b/include/uapi/linux/psp-dbc.h
@@ -46,6 +46,23 @@ struct dbc_user_setuid {
 } __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
  *
  * possible return codes for all DBC IOCTLs:
@@ -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__ */