[SCSI] mpt2sas: Provide sysfs attribute to report Backup Rail Monitor Status

A new sysfs shost attribute called "BMR_status" is implemented to
report Backup Rail Monitor status.

This attribute is located in the path
        /sys/class/scsi_host/host#/BMR_status

when reading this adapter attribute, then driver will output the state
of GPIO[24]. It returns "0" if BMR is healthy and it returns "1" for failure.

if it returns an empty string then it means that there was an error while
obtaining the BMR status. Then check dmesg for what error has occured.

Signed-off-by: Sreekanth Reddy <sreekanth.reddy@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/mpt2sas/mpt2sas_base.h b/drivers/scsi/mpt2sas/mpt2sas_base.h
index 2aeb6f9746027f41db4e829f739e5a2ce77788f8..3d1a30ab9a411547917560c186fe760ee01772cd 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -1096,6 +1096,8 @@ int mpt2sas_config_get_iounit_pg1(struct MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
     *mpi_reply, Mpi2IOUnitPage1_t *config_page);
 int mpt2sas_config_set_iounit_pg1(struct MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
     *mpi_reply, Mpi2IOUnitPage1_t *config_page);
+int mpt2sas_config_get_iounit_pg3(struct MPT2SAS_ADAPTER *ioc,
+       Mpi2ConfigReply_t *mpi_reply, Mpi2IOUnitPage3_t *config_page, u16 sz);
 int mpt2sas_config_get_sas_iounit_pg1(struct MPT2SAS_ADAPTER *ioc, Mpi2ConfigReply_t
     *mpi_reply, Mpi2SasIOUnitPage1_t *config_page, u16 sz);
 int mpt2sas_config_set_sas_iounit_pg1(struct MPT2SAS_ADAPTER *ioc,

diff --git a/drivers/scsi/mpt2sas/mpt2sas_config.c b/drivers/scsi/mpt2sas/mpt2sas_config.c
index 323309b22c8d1304ddabe4682c9b7bcb2ce3f85a..863778071a9dd3b25e85cc9201f9f659763aa393 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_config.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_config.c
@@ -682,6 +682,42 @@ mpt2sas_config_set_iounit_pg1(struct MPT2SAS_ADAPTER *ioc,
        return r;
 }
 
+/**
+ * mpt2sas_config_get_iounit_pg3 - obtain iounit page 3
+ * @ioc: per adapter object
+ * @mpi_reply: reply mf payload returned from firmware
+ * @config_page: contents of the config page
+ * @sz: size of buffer passed in config_page
+ * Context: sleep.
+ *
+ * Returns 0 for success, non-zero for failure.
+ */
+int
+mpt2sas_config_get_iounit_pg3(struct MPT2SAS_ADAPTER *ioc,
+       Mpi2ConfigReply_t *mpi_reply, Mpi2IOUnitPage3_t *config_page, u16 sz)
+{
+       Mpi2ConfigRequest_t mpi_request;
+       int r;
+
+       memset(&mpi_request, 0, sizeof(Mpi2ConfigRequest_t));
+       mpi_request.Function = MPI2_FUNCTION_CONFIG;
+       mpi_request.Action = MPI2_CONFIG_ACTION_PAGE_HEADER;
+       mpi_request.Header.PageType = MPI2_CONFIG_PAGETYPE_IO_UNIT;
+       mpi_request.Header.PageNumber = 3;
+       mpi_request.Header.PageVersion = MPI2_IOUNITPAGE3_PAGEVERSION;
+       mpt2sas_base_build_zero_len_sge(ioc, &mpi_request.PageBufferSGE);
+       r = _config_request(ioc, &mpi_request, mpi_reply,
+           MPT2_CONFIG_PAGE_DEFAULT_TIMEOUT, NULL, 0);
+       if (r)
+               goto out;
+
+       mpi_request.Action = MPI2_CONFIG_ACTION_PAGE_READ_CURRENT;
+       r = _config_request(ioc, &mpi_request, mpi_reply,
+           MPT2_CONFIG_PAGE_DEFAULT_TIMEOUT, config_page, sz);
+ out:
+       return r;
+}
+
 /**
  * mpt2sas_config_get_ioc_pg8 - obtain ioc page 8
  * @ioc: per adapter object

diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.c b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
index 6da4a408358c6b5bfca069cd38144c3b52d2455a..64254416a178899677d1470c36bb8efee06c72ce 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_ctl.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
@@ -2690,6 +2690,75 @@ _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 +2970,7 @@ 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,
 };