diff options
Diffstat (limited to 'drivers/s390/cio/css.c')
| -rw-r--r-- | drivers/s390/cio/css.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c index 3c77d65960dbf..5b304dbacaeb3 100644 --- a/drivers/s390/cio/css.c +++ b/drivers/s390/cio/css.c @@ -452,15 +452,50 @@ channel_subsystem_release(struct device *dev) struct channel_subsystem *css; css = to_css(dev); + mutex_destroy(&css->mutex); kfree(css); } +static ssize_t +css_cm_enable_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct channel_subsystem *css = to_css(dev); + + if (!css) + return 0; + return sprintf(buf, "%x\n", css->cm_enabled); +} + +static ssize_t +css_cm_enable_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct channel_subsystem *css = to_css(dev); + int ret; + + switch (buf[0]) { + case '0': + ret = css->cm_enabled ? chsc_secm(css, 0) : 0; + break; + case '1': + ret = css->cm_enabled ? 0 : chsc_secm(css, 1); + break; + default: + ret = -EINVAL; + } + return ret < 0 ? ret : count; +} + +static DEVICE_ATTR(cm_enable, 0644, css_cm_enable_show, css_cm_enable_store); + static inline void __init setup_css(int nr) { u32 tod_high; memset(css[nr], 0, sizeof(struct channel_subsystem)); + mutex_init(&css[nr]->mutex); css[nr]->valid = 1; css[nr]->cssid = nr; sprintf(css[nr]->device.bus_id, "css%x", nr); @@ -507,6 +542,9 @@ init_channel_subsystem (void) ret = device_register(&css[i]->device); if (ret) goto out_free; + if (css_characteristics_avail && css_chsc_characteristics.secm) + device_create_file(&css[i]->device, + &dev_attr_cm_enable); } css_init_done = 1; @@ -519,6 +557,9 @@ out_free: out_unregister: while (i > 0) { i--; + if (css_characteristics_avail && css_chsc_characteristics.secm) + device_remove_file(&css[i]->device, + &dev_attr_cm_enable); device_unregister(&css[i]->device); } out_bus: |