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path: root/drivers/scsi/mpt2sas/mpt2sas_ctl.c
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Diffstat (limited to 'drivers/scsi/mpt2sas/mpt2sas_ctl.c')
-rw-r--r--drivers/scsi/mpt2sas/mpt2sas_ctl.c80
1 files changed, 76 insertions, 4 deletions
diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.c b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
index 49bdd2dc8452..08685c4cf231 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_ctl.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
@@ -3,7 +3,7 @@
* controllers
*
* This code is based on drivers/scsi/mpt2sas/mpt2_ctl.c
- * Copyright (C) 2007-2010 LSI Corporation
+ * Copyright (C) 2007-2012 LSI Corporation
* (mailto:DL-MPTFusionLinux@lsi.com)
*
* This program is free software; you can redistribute it and/or
@@ -2181,10 +2181,12 @@ _ctl_ioctl_main(struct file *file, unsigned int cmd, void __user *arg,
return -EAGAIN;
state = (file->f_flags & O_NONBLOCK) ? NON_BLOCKING : BLOCKING;
- if (state == NON_BLOCKING && !mutex_trylock(&ioc->ctl_cmds.mutex))
- return -EAGAIN;
- else if (mutex_lock_interruptible(&ioc->ctl_cmds.mutex))
+ if (state == NON_BLOCKING) {
+ if (!mutex_trylock(&ioc->ctl_cmds.mutex))
+ return -EAGAIN;
+ } else if (mutex_lock_interruptible(&ioc->ctl_cmds.mutex)) {
return -ERESTARTSYS;
+ }
switch (cmd) {
case MPT2IOCINFO:
@@ -2690,6 +2692,75 @@ _ctl_ioc_reply_queue_count_show(struct device *cdev,
static DEVICE_ATTR(reply_queue_count, S_IRUGO,
_ctl_ioc_reply_queue_count_show, NULL);
+/**
+ * _ctl_BRM_status_show - Backup Rail Monitor Status
+ * @cdev - pointer to embedded class device
+ * @buf - the buffer returned
+ *
+ * This is number of reply queues
+ *
+ * A sysfs 'read-only' shost attribute.
+ */
+static ssize_t
+_ctl_BRM_status_show(struct device *cdev, struct device_attribute *attr,
+ char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(cdev);
+ struct MPT2SAS_ADAPTER *ioc = shost_priv(shost);
+ Mpi2IOUnitPage3_t *io_unit_pg3 = NULL;
+ Mpi2ConfigReply_t mpi_reply;
+ u16 backup_rail_monitor_status = 0;
+ u16 ioc_status;
+ int sz;
+ ssize_t rc = 0;
+
+ if (!ioc->is_warpdrive) {
+ printk(MPT2SAS_ERR_FMT "%s: BRM attribute is only for"\
+ "warpdrive\n", ioc->name, __func__);
+ goto out;
+ }
+
+ /* allocate upto GPIOVal 36 entries */
+ sz = offsetof(Mpi2IOUnitPage3_t, GPIOVal) + (sizeof(u16) * 36);
+ io_unit_pg3 = kzalloc(sz, GFP_KERNEL);
+ if (!io_unit_pg3) {
+ printk(MPT2SAS_ERR_FMT "%s: failed allocating memory"\
+ "for iounit_pg3: (%d) bytes\n", ioc->name, __func__, sz);
+ goto out;
+ }
+
+ if (mpt2sas_config_get_iounit_pg3(ioc, &mpi_reply, io_unit_pg3, sz) !=
+ 0) {
+ printk(MPT2SAS_ERR_FMT
+ "%s: failed reading iounit_pg3\n", ioc->name,
+ __func__);
+ goto out;
+ }
+
+ ioc_status = le16_to_cpu(mpi_reply.IOCStatus) & MPI2_IOCSTATUS_MASK;
+ if (ioc_status != MPI2_IOCSTATUS_SUCCESS) {
+ printk(MPT2SAS_ERR_FMT "%s: iounit_pg3 failed with"\
+ "ioc_status(0x%04x)\n", ioc->name, __func__, ioc_status);
+ goto out;
+ }
+
+ if (io_unit_pg3->GPIOCount < 25) {
+ printk(MPT2SAS_ERR_FMT "%s: iounit_pg3->GPIOCount less than"\
+ "25 entries, detected (%d) entries\n", ioc->name, __func__,
+ io_unit_pg3->GPIOCount);
+ goto out;
+ }
+
+ /* BRM status is in bit zero of GPIOVal[24] */
+ backup_rail_monitor_status = le16_to_cpu(io_unit_pg3->GPIOVal[24]);
+ rc = snprintf(buf, PAGE_SIZE, "%d\n", (backup_rail_monitor_status & 1));
+
+ out:
+ kfree(io_unit_pg3);
+ return rc;
+}
+static DEVICE_ATTR(BRM_status, S_IRUGO, _ctl_BRM_status_show, NULL);
+
struct DIAG_BUFFER_START {
__le32 Size;
__le32 DiagVersion;
@@ -2901,6 +2972,7 @@ struct device_attribute *mpt2sas_host_attrs[] = {
&dev_attr_host_trace_buffer,
&dev_attr_host_trace_buffer_enable,
&dev_attr_reply_queue_count,
+ &dev_attr_BRM_status,
NULL,
};