sugar/linux
1
0
Fork 0
Code Activity

platform/x86: ISST: Add Intel Speed Select mmio interface

Browse Source 
Added MMIO interface to read/write specific offsets in PUNIT PCI device
which export core priortization. This MMIO interface can be used using
ioctl interface on /dev/isst_interface using IOCTL ISST_IF_IO_CMD.

This MMIO interface is used by the intel-speed-select tool under
tools/x86/power to enumerate and set core priority. The MMIO offsets and
semantics of the message can be checked from the source code of the tool.

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 15:38:46 -07:00
committed by Andy Shevchenko
parent fb5b36a413
commit d3a2358429
5 changed files with 173 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
include/uapi/linux/isst_if.h
View File

@@ -63,7 +63,40 @@ struct isst_if_cpu_maps {
struct isst_if_cpu_map cpu_map[1];
};
/**
* struct isst_if_io_reg - Read write PUNIT IO register
* @read_write: Value 0: Read, 1: Write
* @logical_cpu: Logical CPU number to get target PCI device.
* @reg: PUNIT register offset
* @value: For write operation value to write and for
* for read placeholder read value
*
* Structure to specify read/write data to PUNIT registers.
*/
struct isst_if_io_reg {
__u32 read_write; /* Read:0, Write:1 */
__u32 logical_cpu;
__u32 reg;
__u32 value;
};
/**
* struct isst_if_io_regs - structure for IO register commands
* @cmd_count: Number of io reg commands in io_reg[]
* @io_reg[]: Holds one or more io_reg command structure
*
* This structure used with ioctl ISST_IF_IO_CMD to send
* one or more read/write commands to PUNIT. Here IOCTL return value
* indicates number of requests sent or error number if no requests have
* been sent.
*/
struct isst_if_io_regs {
__u32 req_count;
struct isst_if_io_reg io_reg[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 *)
#endif