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>

diff --git a/drivers/crypto/ccp/dbc.c b/drivers/crypto/ccp/dbc.c
index c6f5fb3..839ea14 100644 (file)
--- a/drivers/crypto/ccp/dbc.c
+++ b/drivers/crypto/ccp/dbc.c
@@ -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;
 

diff --git a/drivers/crypto/ccp/dbc.h b/drivers/crypto/ccp/dbc.h
index 1564351..e963099 100644 (file)
--- a/drivers/crypto/ccp/dbc.h
+++ b/drivers/crypto/ccp/dbc.h
@@ -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);

diff --git a/include/linux/psp-platform-access.h b/include/linux/psp-platform-access.h
index 18b9e0f..c1dc87f 100644 (file)
--- 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 7443c78..b3845a9 100644 (file)
--- 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__ */