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platform/x86: ISST: Add IOCTL to Translate Linux logical CPU to PUNIT CPU number

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Add processing for IOCTL command ISST_IF_GET_PHY_ID. This converts from the
Linux logical CPU to PUNIT CPU numbering scheme.

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 15:38:45 -07:00 committed by Andy Shevchenko
parent 8fbfb6fc67
commit fb5b36a413
2 changed files with 102 additions and 0 deletions
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74
drivers/platform/x86/intel_speed_select_if/isst_if_common.c
View File

@ -134,16 +134,90 @@ static void isst_if_cpu_info_exit(void)
kfree(isst_cpu_info);
};
static long isst_if_proc_phyid_req(u8 *cmd_ptr, int *write_only, int resume)
{
struct isst_if_cpu_map *cpu_map;
cpu_map = (struct isst_if_cpu_map *)cmd_ptr;
if (cpu_map->logical_cpu >= nr_cpu_ids ||
cpu_map->logical_cpu >= num_possible_cpus())
return -EINVAL;
*write_only = 0;
cpu_map->physical_cpu = isst_cpu_info[cpu_map->logical_cpu].punit_cpu_id;
return 0;
}
static long isst_if_exec_multi_cmd(void __user *argp, struct isst_if_cmd_cb *cb)
{
unsigned char __user *ptr;
u32 cmd_count;
u8 *cmd_ptr;
long ret;
int i;
/* Each multi command has u32 command count as the first field */
if (copy_from_user(&cmd_count, argp, sizeof(cmd_count)))
return -EFAULT;
if (!cmd_count || cmd_count > ISST_IF_CMD_LIMIT)
return -EINVAL;
cmd_ptr = kmalloc(cb->cmd_size, GFP_KERNEL);
if (!cmd_ptr)
return -ENOMEM;
/* cb->offset points to start of the command after the command count */
ptr = argp + cb->offset;
for (i = 0; i < cmd_count; ++i) {
int wr_only;
if (signal_pending(current)) {
ret = -EINTR;
break;
}
if (copy_from_user(cmd_ptr, ptr, cb->cmd_size)) {
ret = -EFAULT;
break;
}
ret = cb->cmd_callback(cmd_ptr, &wr_only, 0);
if (ret)
break;
if (!wr_only && copy_to_user(ptr, cmd_ptr, cb->cmd_size)) {
ret = -EFAULT;
break;
}
ptr += cb->cmd_size;
}
kfree(cmd_ptr);
return i ? i : ret;
}
static long isst_if_def_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
struct isst_if_cmd_cb cmd_cb;
long ret = -ENOTTY;
switch (cmd) {
case ISST_IF_GET_PLATFORM_INFO:
ret = isst_if_get_platform_info(argp);
break;
case ISST_IF_GET_PHY_ID:
cmd_cb.cmd_size = sizeof(struct isst_if_cpu_map);
cmd_cb.offset = offsetof(struct isst_if_cpu_maps, cpu_map);
cmd_cb.cmd_callback = isst_if_proc_phyid_req;
ret = isst_if_exec_multi_cmd(argp, &cmd_cb);
break;
default:
break;
}

28
include/uapi/linux/isst_if.h
View File

@ -36,6 +36,34 @@ struct isst_if_platform_info {
__u8 mmio_supported;
};
/**
* struct isst_if_cpu_map - CPU mapping between logical and physical CPU
* @logical_cpu: Linux logical CPU number
* @physical_cpu: PUNIT CPU number
*
* Used to convert from Linux logical CPU to PUNIT CPU numbering scheme.
* The PUNIT CPU number is different than APIC ID based CPU numbering.
*/
struct isst_if_cpu_map {
__u32 logical_cpu;
__u32 physical_cpu;
};
/**
* struct isst_if_cpu_maps - structure for CPU map IOCTL
* @cmd_count: Number of CPU mapping command in cpu_map[]
* @cpu_map[]: Holds one or more CPU map data structure
*
* This structure used with ioctl ISST_IF_GET_PHY_ID to send
* one or more CPU mapping commands. Here IOCTL return value indicates
* number of commands sent or error number if no commands have been sent.
*/
struct isst_if_cpu_maps {
__u32 cmd_count;
struct isst_if_cpu_map cpu_map[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 *)
#endif