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iwlwifi: add debugfs to send host command

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Add debugfs to send host command in mvm and fmac op modes.
Allows to send host command at runtime via send_hcmd debugfs file.
The command is received as a string that represents hex values.

The struct of the command is as follows:
[cmd_id][flags][length][data]
cmd_id and flags are 8 chars long each.
length is 4 chars long.
data is length * 2 chars long.

Signed-off-by: Shahar S Matityahu <shahar.s.matityahu@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Shahar S Matityahu 2018-05-28 11:18:43 +03:00 committed by Luca Coelho
parent d3f4b6debc
commit 755384b377
1 changed files with 64 additions and 0 deletions
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64
drivers/net/wireless/intel/iwlwifi/fw/debugfs.c
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@ -258,11 +258,75 @@ static ssize_t iwl_dbgfs_timestamp_marker_read(struct iwl_fw_runtime *fwrt,
FWRT_DEBUGFS_READ_WRITE_FILE_OPS(timestamp_marker, 16);
struct hcmd_write_data {
__be32 cmd_id;
__be32 flags;
__be16 length;
u8 data[0];
} __packed;
static ssize_t iwl_dbgfs_send_hcmd_write(struct iwl_fw_runtime *fwrt, char *buf,
size_t count)
{
size_t header_size = (sizeof(u32) * 2 + sizeof(u16)) * 2;
size_t data_size = (count - 1) / 2;
int ret;
struct hcmd_write_data *data;
struct iwl_host_cmd hcmd = {
.len = { 0, },
.data = { NULL, },
};
if (fwrt->ops && fwrt->ops->fw_running &&
!fwrt->ops->fw_running(fwrt->ops_ctx))
return -EIO;
if (count < header_size + 1 || count > 1024 * 4)
return -EINVAL;
data = kmalloc(data_size, GFP_KERNEL);
if (!data)
return -ENOMEM;
ret = hex2bin((u8 *)data, buf, data_size);
if (ret)
goto out;
hcmd.id = be32_to_cpu(data->cmd_id);
hcmd.flags = be32_to_cpu(data->flags);
hcmd.len[0] = be16_to_cpu(data->length);
hcmd.data[0] = data->data;
if (count != header_size + hcmd.len[0] * 2 + 1) {
IWL_ERR(fwrt,
"host command data size does not match header length\n");
ret = -EINVAL;
goto out;
}
if (fwrt->ops && fwrt->ops->send_hcmd)
ret = fwrt->ops->send_hcmd(fwrt->ops_ctx, &hcmd);
else
ret = -EPERM;
if (ret < 0)
goto out;
if (hcmd.flags & CMD_WANT_SKB)
iwl_free_resp(&hcmd);
out:
kfree(data);
return ret ?: count;
}
FWRT_DEBUGFS_WRITE_FILE_OPS(send_hcmd, 512);
int iwl_fwrt_dbgfs_register(struct iwl_fw_runtime *fwrt,
struct dentry *dbgfs_dir)
{
INIT_DELAYED_WORK(&fwrt->timestamp.wk, iwl_fw_timestamp_marker_wk);
FWRT_DEBUGFS_ADD_FILE(timestamp_marker, dbgfs_dir, 0200);
FWRT_DEBUGFS_ADD_FILE(send_hcmd, dbgfs_dir, 0200);
return 0;
err:
IWL_ERR(fwrt, "Can't create the fwrt debugfs directory\n");