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 4776b51151dae27a49550b027e67d48dd08211ba..d3849c1ac59abff99bc4c79b14a194b54b481ca3 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -1115,6 +1115,8 @@ 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 5e90cd7e9daaba279b5a6da4eed19f336ac9591d..08ce26fd5a131769305baa20559b81ae2efb7f04 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_config.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_config.c
@@ -754,6 +754,42 @@ 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 d0443e581f3c05951dfc658aff018c366bd95231..ff4ef09f50b8f91d7cad1d11e5b972b7154cc31c 100644 (file)
--- a/drivers/scsi/mpt2sas/mpt2sas_ctl.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.c
@@ -2692,6 +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;
@@ -2903,6 +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,
 };