diff options
Diffstat (limited to 'drivers/nvdimm/core.c')
| -rw-r--r-- | drivers/nvdimm/core.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/drivers/nvdimm/core.c b/drivers/nvdimm/core.c index fe9bd6febdd2..c21ba0602029 100644 --- a/drivers/nvdimm/core.c +++ b/drivers/nvdimm/core.c @@ -4,6 +4,7 @@ */ #include <linux/libnvdimm.h> #include <linux/badblocks.h> +#include <linux/suspend.h> #include <linux/export.h> #include <linux/module.h> #include <linux/blkdev.h> @@ -389,8 +390,156 @@ static const struct attribute_group nvdimm_bus_attribute_group = { .attrs = nvdimm_bus_attributes, }; +static ssize_t capability_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); + struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; + enum nvdimm_fwa_capability cap; + + if (!nd_desc->fw_ops) + return -EOPNOTSUPP; + + nvdimm_bus_lock(dev); + cap = nd_desc->fw_ops->capability(nd_desc); + nvdimm_bus_unlock(dev); + + switch (cap) { + case NVDIMM_FWA_CAP_QUIESCE: + return sprintf(buf, "quiesce\n"); + case NVDIMM_FWA_CAP_LIVE: + return sprintf(buf, "live\n"); + default: + return -EOPNOTSUPP; + } +} + +static DEVICE_ATTR_RO(capability); + +static ssize_t activate_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); + struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; + enum nvdimm_fwa_capability cap; + enum nvdimm_fwa_state state; + + if (!nd_desc->fw_ops) + return -EOPNOTSUPP; + + nvdimm_bus_lock(dev); + cap = nd_desc->fw_ops->capability(nd_desc); + state = nd_desc->fw_ops->activate_state(nd_desc); + nvdimm_bus_unlock(dev); + + if (cap < NVDIMM_FWA_CAP_QUIESCE) + return -EOPNOTSUPP; + + switch (state) { + case NVDIMM_FWA_IDLE: + return sprintf(buf, "idle\n"); + case NVDIMM_FWA_BUSY: + return sprintf(buf, "busy\n"); + case NVDIMM_FWA_ARMED: + return sprintf(buf, "armed\n"); + case NVDIMM_FWA_ARM_OVERFLOW: + return sprintf(buf, "overflow\n"); + default: + return -ENXIO; + } +} + +static int exec_firmware_activate(void *data) +{ + struct nvdimm_bus_descriptor *nd_desc = data; + + return nd_desc->fw_ops->activate(nd_desc); +} + +static ssize_t activate_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t len) +{ + struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); + struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; + enum nvdimm_fwa_state state; + bool quiesce; + ssize_t rc; + + if (!nd_desc->fw_ops) + return -EOPNOTSUPP; + + if (sysfs_streq(buf, "live")) + quiesce = false; + else if (sysfs_streq(buf, "quiesce")) + quiesce = true; + else + return -EINVAL; + + nvdimm_bus_lock(dev); + state = nd_desc->fw_ops->activate_state(nd_desc); + + switch (state) { + case NVDIMM_FWA_BUSY: + rc = -EBUSY; + break; + case NVDIMM_FWA_ARMED: + case NVDIMM_FWA_ARM_OVERFLOW: + if (quiesce) + rc = hibernate_quiet_exec(exec_firmware_activate, nd_desc); + else + rc = nd_desc->fw_ops->activate(nd_desc); + break; + case NVDIMM_FWA_IDLE: + default: + rc = -ENXIO; + } + nvdimm_bus_unlock(dev); + + if (rc == 0) + rc = len; + return rc; +} + +static DEVICE_ATTR_ADMIN_RW(activate); + +static umode_t nvdimm_bus_firmware_visible(struct kobject *kobj, struct attribute *a, int n) +{ + struct device *dev = container_of(kobj, typeof(*dev), kobj); + struct nvdimm_bus *nvdimm_bus = to_nvdimm_bus(dev); + struct nvdimm_bus_descriptor *nd_desc = nvdimm_bus->nd_desc; + enum nvdimm_fwa_capability cap; + + /* + * Both 'activate' and 'capability' disappear when no ops + * detected, or a negative capability is indicated. + */ + if (!nd_desc->fw_ops) + return 0; + + nvdimm_bus_lock(dev); + cap = nd_desc->fw_ops->capability(nd_desc); + nvdimm_bus_unlock(dev); + + if (cap < NVDIMM_FWA_CAP_QUIESCE) + return 0; + + return a->mode; +} +static struct attribute *nvdimm_bus_firmware_attributes[] = { + &dev_attr_activate.attr, + &dev_attr_capability.attr, + NULL, +}; + +static const struct attribute_group nvdimm_bus_firmware_attribute_group = { + .name = "firmware", + .attrs = nvdimm_bus_firmware_attributes, + .is_visible = nvdimm_bus_firmware_visible, +}; + const struct attribute_group *nvdimm_bus_attribute_groups[] = { &nvdimm_bus_attribute_group, + &nvdimm_bus_firmware_attribute_group, NULL, }; |