diff options
author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2019-06-27 00:38:45 +0200 |
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committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2019-07-02 17:41:16 +0200 |
commit | fb5b36a413b9f30fba573fc2a596ab7142dfaf12 (patch) | |
tree | 0e295d34f12f1d82dbf3d35e99fecb61900dadae /drivers/platform | |
parent | platform/x86: ISST: Store per CPU information (diff) | |
download | linux-fb5b36a413b9f30fba573fc2a596ab7142dfaf12.tar.xz linux-fb5b36a413b9f30fba573fc2a596ab7142dfaf12.zip |
platform/x86: ISST: Add IOCTL to Translate Linux logical CPU to PUNIT CPU number
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>
Diffstat (limited to 'drivers/platform')
-rw-r--r-- | drivers/platform/x86/intel_speed_select_if/isst_if_common.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel_speed_select_if/isst_if_common.c b/drivers/platform/x86/intel_speed_select_if/isst_if_common.c index 0e16cbf685d0..72e74d72724b 100644 --- a/drivers/platform/x86/intel_speed_select_if/isst_if_common.c +++ b/drivers/platform/x86/intel_speed_select_if/isst_if_common.c @@ -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; } |