IB/qib: Add sysfs interface to read free contexts

Indicate the number of free user contexts via the sysfs file
/sys/class/infiniband/qib0/nfreectxts as required for PSM.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/qib/qib_sysfs.c b/drivers/infiniband/hw/qib/qib_sysfs.c
index d50a33fe8bbc..14d129de4320 100644
--- a/drivers/infiniband/hw/qib/qib_sysfs.c
+++ b/drivers/infiniband/hw/qib/qib_sysfs.c
@@ -507,6 +507,18 @@ static ssize_t show_nctxts(struct device *device,
                 dd->first_user_ctxt);
 }
 
+static ssize_t show_nfreectxts(struct device *device,
+                           struct device_attribute *attr, char *buf)
+{
+        struct qib_ibdev *dev =
+                container_of(device, struct qib_ibdev, ibdev.dev);
+        struct qib_devdata *dd = dd_from_dev(dev);
+
+        /* Return the number of free user ports (contexts) available. */
+        return scnprintf(buf, PAGE_SIZE, "%u\n", dd->cfgctxts -
+                dd->first_user_ctxt - (u32)qib_stats.sps_ctxts);
+}
+
 static ssize_t show_serial(struct device *device,
                            struct device_attribute *attr, char *buf)
 {
@@ -604,6 +616,7 @@ static DEVICE_ATTR(hca_type, S_IRUGO, show_hca, NULL);
 static DEVICE_ATTR(board_id, S_IRUGO, show_hca, NULL);
 static DEVICE_ATTR(version, S_IRUGO, show_version, NULL);
 static DEVICE_ATTR(nctxts, S_IRUGO, show_nctxts, NULL);
+static DEVICE_ATTR(nfreectxts, S_IRUGO, show_nfreectxts, NULL);
 static DEVICE_ATTR(serial, S_IRUGO, show_serial, NULL);
 static DEVICE_ATTR(boardversion, S_IRUGO, show_boardversion, NULL);
 static DEVICE_ATTR(logged_errors, S_IRUGO, show_logged_errs, NULL);
@@ -617,6 +630,7 @@ static struct device_attribute *qib_attributes[] = {
         &dev_attr_board_id,
         &dev_attr_version,
         &dev_attr_nctxts,
+        &dev_attr_nfreectxts,
         &dev_attr_serial,
         &dev_attr_boardversion,
         &dev_attr_logged_errors,