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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>
This commit is contained in:
Ram Vepa 2011-05-31 20:20:43 +00:00 committed by Roland Dreier
parent ac0cae4495
commit 2df4f7579d
1 changed files with 14 additions and 0 deletions
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14
drivers/infiniband/hw/qib/qib_sysfs.c
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@ -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,