platform/x86: ISST: Add Intel Speed Select PUNIT MSR interface

While using new non arhitectural features using PUNIT Mailbox and MMIO read/write interface, still there is need to operate using MSRs to control PUNIT. User space could have used user user-space MSR interface for this, but when user space MSR access is disabled, then it can't. Here only limited number of MSRs are allowed using this new interface.

Srinivas Pandruvada committed 7 years ago

Commit e765f371 parent 71b21bd2 files · +91 −0Browse files

Showing the changes to include/uapi/linux (1 of 2 files). Show all

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include/uapi/linux/isst_if.h+32−0

@@ -132,9 +132,41 @@ struct isst_if_mbox_cmds { · 131 unmodified lines
132	132	struct isst_if_mbox_cmd mbox_cmd[1];
133	133	};
134	134
	135	+/**
	136	+ * struct isst_if_msr_cmd - Structure to define msr command
	137	+ * @read_write: Value 0: Read, 1: Write
	138	+ * @logical_cpu: Logical CPU number
	139	+ * @msr: MSR number
	140	+ * @data: For write operation, data to write, for read
	141	+ * place holder
	142	+ *
	143	+ * Structure to specify MSR command related to PUNIT.
	144	+ */
	145	+struct isst_if_msr_cmd {
	146	+ __u32 read_write; /* Read:0, Write:1 */
	147	+ __u32 logical_cpu;
	148	+ __u64 msr;
	149	+ __u64 data;
	150	+};
	151	+
	152	+/**
	153	+ * struct isst_if_msr_cmds - structure for msr commands
	154	+ * @cmd_count: Number of mailbox commands in msr_cmd[]
	155	+ * @msr_cmd[]: Holds one or more msr commands
	156	+ *
	157	+ * This structure used with ioctl ISST_IF_MSR_COMMAND to send
	158	+ * one or more MSR commands. IOCTL return value indicates number of
	159	+ * commands sent or error number if no commands have been sent.
	160	+ */
	161	+struct isst_if_msr_cmds {
	162	+ __u32 cmd_count;
	163	+ struct isst_if_msr_cmd msr_cmd[1];
	164	+};
	165	+
135	166	#define ISST_IF_MAGIC 0xFE
136	167	#define ISST_IF_GET_PLATFORM_INFO _IOR(ISST_IF_MAGIC, 0, struct isst_if_platform_info *)
137	168	#define ISST_IF_GET_PHY_ID _IOWR(ISST_IF_MAGIC, 1, struct isst_if_cpu_map *)
138	169	#define ISST_IF_IO_CMD _IOW(ISST_IF_MAGIC, 2, struct isst_if_io_regs *)
139	170	#define ISST_IF_MBOX_COMMAND _IOWR(ISST_IF_MAGIC, 3, struct isst_if_mbox_cmds *)
	171	+#define ISST_IF_MSR_COMMAND _IOWR(ISST_IF_MAGIC, 4, struct isst_if_msr_cmds *)
140	172	#endif