[PATCH v2 1/7] platform/x86/amd/hsmp: Add new HSMP messages for Family 1Ah, Model 50h-5Fh

Muralidhara M K
2026-04-27T15:52:04Z

From: Suma Hegde <suma.hegde@amd.com>

The new messages extend the HSMP interface to provide finer control over
power states and system monitoring capabilities.

Power state control:
- Get/Set PC6 and CC6 enable/disable control (0x29, 0x2A)

Power and thermal monitoring:
- Get CCD power consumption reading (0x34)
- Get Thermal delta (Tdelta) reading (0x35)
- Get SVI3 VR controller temperature (0x36)

DIMM sideband operations:
- Get/Set DIMM sideband data(0x33, 0x39)

Power management:
- Get/Set Floor limit control (0x38)
- Get/Set SDPS limit control (0x3A)

System capabilities:
- Get enabled HSMP commands (0x37)

Bump driver version to 2.6.

Reviewed-by: Muralidhara M K <muralidhara.mk@amd.com>
Co-developed-by: Muthusamy Ramalingam <muthusamy.ramalingam@amd.com>
Signed-off-by: Muthusamy Ramalingam <muthusamy.ramalingam@amd.com>
Signed-off-by: Suma Hegde <suma.hegde@amd.com>
---
Changes v1->v2: None

arch/x86/include/uapi/asm/amd_hsmp.h | 142 +++++++++++++++++++++++----
drivers/platform/x86/amd/hsmp/hsmp.h | 2 +-
2 files changed, 126 insertions(+), 18 deletions(-)

diff --git a/arch/x86/include/uapi/asm/amd_hsmp.h b/arch/x86/include/uapi/asm/amd_hsmp.h
index 92d8f256d096..603d62f8d4da 100644
--- a/arch/x86/include/uapi/asm/amd_hsmp.h
+++ b/arch/x86/include/uapi/asm/amd_hsmp.h
@@ -53,9 +53,19 @@ enum hsmp_message_ids {
HSMP_SET_XGMI_PSTATE_RANGE, /* 26h Set xGMI P-state range */
HSMP_CPU_RAIL_ISO_FREQ_POLICY, /* 27h Get/Set Cpu Iso frequency policy */
HSMP_DFC_ENABLE_CTRL, /* 28h Enable/Disable DF C-state */
+ HSMP_PC6_ENABLE, /* 29h Get/Set PC6 enable/disable status */
+ HSMP_CC6_ENABLE, /* 2Ah Get/Set CC6 enable/disable status */
HSMP_GET_RAPL_UNITS = 0x30, /* 30h Get scaling factor for energy */
HSMP_GET_RAPL_CORE_COUNTER, /* 31h Get core energy counter value */
HSMP_GET_RAPL_PACKAGE_COUNTER, /* 32h Get package energy counter value */
+ HSMP_DIMM_SB_RD, /* 33h Get data from a specified device on the DIMM */
+ HSMP_READ_CCD_POWER, /* 34h Get the average power consumed by CCD */
+ HSMP_READ_TDELTA, /* 35h Get thermal solution behaviour */
+ HSMP_GET_SVI3_VR_CTRL_TEMP, /* 36h Get temperature of SVI3 VR controller rails */
+ HSMP_GET_ENABLED_HSMP_CMDS, /* 37h Get/Set supported HSMP commands */
+ HSMP_SET_GET_FLOOR_LIMIT, /* 38h Get/Set supported Floor limit commands */
+ HSMP_DIMM_SB_WR, /* 39h Set data to a specified device on the DIMM */
+ HSMP_SDPS_LIMIT, /* 3Ah Get/Set SDPS limit */
HSMP_MSG_ID_MAX,
};

@@ -170,16 +180,18 @@ static const struct hsmp_msg_desc hsmp_msg_desc_table[]
{0, 1, HSMP_GET},

/*
- * HSMP_SET_XGMI_LINK_WIDTH, num_args = 1, response_sz = 0
- * input: args[0] = min link width[15:8] + max link width[7:0]
+ * HSMP_SET_XGMI_LINK_WIDTH, num_args = 1, response_sz = 0/1
+ * input: args[0] = set/get XGMI Link width[31] + min link width[15:8] + max link width[7:0]
+ * output: args[0] = current min link width[15:8] + current max link width[7:0]
*/
- {1, 0, HSMP_SET},
+ {1, 1, HSMP_SET_GET},

/*
- * HSMP_SET_DF_PSTATE, num_args = 1, response_sz = 0
- * input: args[0] = df pstate[7:0]
+ * HSMP_SET_DF_PSTATE, num_args = 1, response_sz = 0/1
+ * input: args[0] = set/get df pstate[31] + df pstate[7:0]
+ * output: args[0] = APB enabled/disabled[8] + current df pstate[7:0]
*/
- {1, 0, HSMP_SET},
+ {1, 1, HSMP_SET_GET},

/* HSMP_SET_AUTO_DF_PSTATE, num_args = 0, response_sz = 0 */
{0, 0, HSMP_SET},
@@ -305,16 +317,18 @@ static const struct hsmp_msg_desc hsmp_msg_desc_table[]
{1, 1, HSMP_SET},

/*
- * HSMP_SET_POWER_MODE, num_args = 1, response_sz = 0
- * input: args[0] = power efficiency mode[2:0]
+ * HSMP_SET_POWER_MODE, num_args = 1, response_sz = 0/1
+ * input: args[0] = set/get power mode[31] + power efficiency mode[2:0]
+ * output: args[0] = current power efficiency mode[2:0]
*/
{1, 1, HSMP_SET_GET},

/*
- * HSMP_SET_PSTATE_MAX_MIN, num_args = 1, response_sz = 0
- * input: args[0] = min df pstate[15:8] + max df pstate[7:0]
+ * HSMP_SET_PSTATE_MAX_MIN, num_args = 1, response_sz = 0/1
+ * input: args[0] = set/get DF P-state range[31] + min df pstate[15:8] + max df pstate[7:0]
+ * output: args[0] = min df pstate[15:8] + max df pstate[7:0]
*/
- {1, 0, HSMP_SET},
+ {1, 1, HSMP_SET_GET},

/*
* HSMP_GET_METRIC_TABLE_VER, num_args = 0, response_sz = 1
@@ -335,10 +349,12 @@ static const struct hsmp_msg_desc hsmp_msg_desc_table[]
{0, 2, HSMP_GET},

/*
- * HSMP_SET_XGMI_PSTATE_RANGE, num_args = 1, response_sz = 0
- * input: args[0] = min xGMI p-state[15:8] + max xGMI p-state[7:0]
+ * HSMP_SET_XGMI_PSTATE_RANGE, num_args = 1, response_sz = 0/1
+ * input: args[0] = set/get XGMI pstate range[31] + min xGMI p-state[15:8] +
+ * max xGMI p-state[7:0]
+ * output: args[0] = min xGMI p-state[15:8] + max xGMI p-state[7:0]
*/
- {1, 0, HSMP_SET},
+ {1, 1, HSMP_SET_GET},

/*
* HSMP_CPU_RAIL_ISO_FREQ_POLICY, num_args = 1, response_sz = 1
@@ -355,9 +371,21 @@ static const struct hsmp_msg_desc hsmp_msg_desc_table[]
*/
{1, 1, HSMP_SET_GET},

- /* RESERVED(0x29-0x2f) */
- {0, 0, HSMP_RSVD},
- {0, 0, HSMP_RSVD},
+ /*
+ * HSMP_PC6_ENABLE, num_args = 1, response_sz = 0/1
+ * input: args[0] = set/get PC6 control[31] + disable/enable PC6[0]
+ * output: args[0] = current PC6 control status[0]
+ */
+ {1, 1, HSMP_SET_GET},
+
+ /*
+ * HSMP_CC6_ENABLE, num_args = 1, response_sz = 0/1
+ * input: args[0] = set/get CC6 control[31] + disable/enable CC6[0]
+ * output: args[0] = current CC6 control status[0]
+ */
+ {1, 1, HSMP_SET_GET},
+
+ /* RESERVED(0x2B-0x2F) */
{0, 0, HSMP_RSVD},
{0, 0, HSMP_RSVD},
{0, 0, HSMP_RSVD},
@@ -385,6 +413,86 @@ static const struct hsmp_msg_desc hsmp_msg_desc_table[]
*/
{0, 2, HSMP_GET},

+ /*
+ * HSMP_DIMM_SB_RD, num_args = 1, response_sz = 1
+ * input: args[0] =
+ * Register space[23]
+ * Register offset in given reg space[22:12]
+ * LID of device[11:8]
+ * DIMM address[7:0]
+ * output: args[0] = [3:0] Read data byte
+ */
+ {1, 1, HSMP_GET},
+
+ /*
+ * HSMP_READ_CCD_POWER, num_args = 1, response_sz = 1
+ * input: args[0] = apic id of core[15:0]
+ * output: args[0] = CCD power(mWatts)[31:0]
+ */
+ {1, 1, HSMP_GET},
+
+ /*
+ * HSMP_READ_TDELTA, num_args = 0, response_sz = 1
+ * input: None
+ * output: args[0] = thermal behaviour[31:0]
+ */
+ {0, 1, HSMP_GET},
+
+ /*
+ * HSMP_GET_SVI3_VR_CTRL_TEMP, num_args = 1, response_sz = 1
+ * input: args[0] = SVI3 rail index[3:1] + Read SVI3 temperature data[0]
+ * output: args[0] = SVI3 rail index[30:28] + SVI3 rail temperature(degree C)[27:0]
+ */
+ {1, 1, HSMP_GET},
+
+ /*
+ * HSMP_GET_ENABLED_HSMP_CMDS, num_args = 1, response_sz = 3
+ * input: args[0] = HSMP command mask[0]
+ * output: status of HSMP command = args[0], args[1], args[2]
+ */
+ {1, 3, HSMP_GET},
+
+ /*
+ * HSMP_SET_GET_FLOOR_LIMIT, num_args = 1, response_sz = 1
+ * input: args[0] =
+ * Set or Get[31:30]
+ * Set the Floor frequency per core = 00
+ * Set the Floor frequency for all cores = 01
+ * Get the Floor frequency of a core = 10
+ * Get the Effective Floor frequency per core = 11
+ * Reserved[29:28]
+ * Apic id / Reserved[27:16]
+ * args[27:16] is reserved if args[31:30] = 01
+ * Floor frequency limit / Reserved[15:0]
+ * if args[31] = 0, Floor frequency limit, else reserved
+ *
+ * output: args[0] =
+ * Effective Floor frequency limit(MHz) / None / Floor frequency limit[15:0]
+ * Effective Floor frequency if input args[31:30] = 11
+ * None if input args[31] = 0
+ * Floor frequency limit (MHz)[15:0] if args[31:30] = 10
+ */
+ {1, 1, HSMP_SET_GET},
+
+ /*
+ * HSMP_DIMM_SB_WR, num_args = 1, response_sz = 0
+ * input: args[0] =
+ * Write Data[31:24]
+ * Register space[23]
+ * Register offset in given reg space[22:12]
+ * LID of device[11:8]
+ * DIMM address[7:0]
+ * output: None
+ */
+ {1, 0, HSMP_SET},
+
+ /*
+ * HSMP_SDPS_LIMIT, num_args = 1, response_sz = 1
+ * input: args[0] = Set/Get[31] + SDPS Limit[30:0]
+ * output: args[0] = SDPS Limit[30:0]
+ */
+ {1, 1, HSMP_SET_GET},
+
};

/* Metrics table (supported only with proto version 6) */
diff --git a/drivers/platform/x86/amd/hsmp/hsmp.h b/drivers/platform/x86/amd/hsmp/hsmp.h
index 0509a442eaae..b153527e0a0d 100644
--- a/drivers/platform/x86/amd/hsmp/hsmp.h
+++ b/drivers/platform/x86/amd/hsmp/hsmp.h
@@ -27,7 +27,7 @@
#define HSMP_DEVNODE_NAME "hsmp"
#define ACPI_HSMP_DEVICE_HID "AMDI0097"

-#define DRIVER_VERSION "2.5"
+#define DRIVER_VERSION "2.6"

struct hsmp_mbaddr_info {
u32 base_addr;
--
2.34.1