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

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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.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Srinivas Pandruvada
2019-06-26 15:38:49 -07:00
committed by Andy Shevchenko
parent 71b21bd7f6
commit e765f37b9b
2 changed files with 91 additions and 0 deletions
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32
include/uapi/linux/isst_if.h
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@@ -132,9 +132,41 @@ struct isst_if_mbox_cmds {
struct isst_if_mbox_cmd mbox_cmd[1];
};
/**
* struct isst_if_msr_cmd - Structure to define msr command
* @read_write: Value 0: Read, 1: Write
* @logical_cpu: Logical CPU number
* @msr: MSR number
* @data: For write operation, data to write, for read
* place holder
*
* Structure to specify MSR command related to PUNIT.
*/
struct isst_if_msr_cmd {
__u32 read_write; /* Read:0, Write:1 */
__u32 logical_cpu;
__u64 msr;
__u64 data;
};
/**
* struct isst_if_msr_cmds - structure for msr commands
* @cmd_count: Number of mailbox commands in msr_cmd[]
* @msr_cmd[]: Holds one or more msr commands
*
* This structure used with ioctl ISST_IF_MSR_COMMAND to send
* one or more MSR commands. IOCTL return value indicates number of
* commands sent or error number if no commands have been sent.
*/
struct isst_if_msr_cmds {
__u32 cmd_count;
struct isst_if_msr_cmd msr_cmd[1];
};
#define ISST_IF_MAGIC 0xFE
#define ISST_IF_GET_PLATFORM_INFO _IOR(ISST_IF_MAGIC, 0, struct isst_if_platform_info *)
#define ISST_IF_GET_PHY_ID _IOWR(ISST_IF_MAGIC, 1, struct isst_if_cpu_map *)
#define ISST_IF_IO_CMD _IOW(ISST_IF_MAGIC, 2, struct isst_if_io_regs *)
#define ISST_IF_MBOX_COMMAND _IOWR(ISST_IF_MAGIC, 3, struct isst_if_mbox_cmds *)
#define ISST_IF_MSR_COMMAND _IOWR(ISST_IF_MAGIC, 4, struct isst_if_msr_cmds *)
#endif