DM Cx: add function to get cx cnt and cx data

DM will use these functions to get cx entry cnt and cx data then inject
_CST objects to UOS DSDT table.

Signed-off-by: Victor Sun <victor.sun@intel.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>

devicemodel/hw/acpi/acpi_pm.c

@@ -59,6 +59,17 @@ static inline uint8_t get_vcpu_px_cnt(struct vmctx *ctx, int vcpu_id)
 	return (uint8_t)px_cnt;
 }
 
+uint8_t get_vcpu_cx_cnt(struct vmctx *ctx, int vcpu_id)
+{
+	uint64_t cx_cnt;
+
+	if (get_vcpu_pm_info(ctx, vcpu_id, PMCMD_GET_CX_CNT, &cx_cnt)) {
+		return 0;
+	}
+
+	return (uint8_t)cx_cnt;
+}
+
 static int get_vcpu_px_data(struct vmctx *ctx, int vcpu_id,
 			int px_num, struct cpu_px_data *vcpu_px_data)
 {
@@ -88,6 +99,35 @@ static int get_vcpu_px_data(struct vmctx *ctx, int vcpu_id,
 	return 0;
 }
 
+int get_vcpu_cx_data(struct vmctx *ctx, int vcpu_id,
+			int cx_num, struct cpu_cx_data *vcpu_cx_data)
+{
+	uint64_t *pm_ioctl_buf;
+	enum pm_cmd_type cmd_type = PMCMD_GET_CX_DATA;
+
+	pm_ioctl_buf = malloc(sizeof(struct cpu_cx_data));
+	if (!pm_ioctl_buf) {
+		return -1;
+	}
+
+	*pm_ioctl_buf = ((ctx->vmid << PMCMD_VMID_SHIFT) & PMCMD_VMID_MASK)
+		| ((vcpu_id << PMCMD_VCPUID_SHIFT) & PMCMD_VCPUID_MASK)
+		| ((cx_num << PMCMD_STATE_NUM_SHIFT) & PMCMD_STATE_NUM_MASK)
+		| cmd_type;
+
+	/* get and validate cx data */
+	if (vm_get_cpu_state(ctx, pm_ioctl_buf)) {
+		free(pm_ioctl_buf);
+		return -1;
+	}
+
+	memcpy(vcpu_cx_data, pm_ioctl_buf,
+			sizeof(struct cpu_cx_data));
+
+	free(pm_ioctl_buf);
+	return 0;
+}
+
 /* _PPC: Performance Present Capabilities
  * hard code _PPC to 0,  all states are available.
  */

devicemodel/include/public/acrn_common.h

@@ -311,6 +311,21 @@ struct acrn_vm_pci_msix_remap {
  * @brief Info The power state data of a VCPU.
  *
  */
+struct acrn_register {
+	uint8_t 	space_id;
+	uint8_t 	bit_width;
+	uint8_t 	bit_offset;
+	uint8_t 	access_size;
+	uint64_t	address;
+} __attribute__((aligned(8)));
+
+struct cpu_cx_data {
+	struct acrn_register cx_reg;
+	uint8_t 	type;
+	uint32_t	latency;
+	uint64_t	power;
+} __attribute__((aligned(8)));
+
 struct cpu_px_data {
 	uint64_t core_frequency;	/* megahertz */
 	uint64_t power;			/* milliWatts */
@@ -323,8 +338,10 @@ struct cpu_px_data {
 /**
  * @brief Info PM command from DM/VHM.
  *
- * The command would specify request type(i.e. get px count or data) for
+ * The command would specify request type(e.g. get px count or data) for
- * specific VM and specific VCPU with specific state number.like P(n).
+ * specific VM and specific VCPU with specific state number.
+ * For Px, PMCMD_STATE_NUM means Px number from 0 to (MAX_PSTATE - 1),
+ * For Cx, PMCMD_STATE_NUM means Cx entry index from 1 to MAX_CX_ENTRY.
  */
 #define PMCMD_VMID_MASK		0xff000000
 #define PMCMD_VCPUID_MASK	0x00ff0000
@@ -338,6 +355,8 @@ struct cpu_px_data {
 enum pm_cmd_type {
 	PMCMD_GET_PX_CNT,
 	PMCMD_GET_PX_DATA,
+	PMCMD_GET_CX_CNT,
+	PMCMD_GET_CX_DATA,
 };
 
 /**