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IB/qib: Correct nfreectxts for multiple HCAs 

The code that was recently introduced to report the number
of free contexts is flawed for multiple HCAs:

       /* 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);

The qib_stats is global to the module, not per HCA, so the code is broken
for multiple HCAs.

This patch adds a qib_devdata field, freectxts, that reflects the free
contexts for this HCA.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Reviewed-by: Ram Vepa <ram.vepa@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Mike Marciniszyn 2011-10-06 09:33:35 -07:00 committed by Roland Dreier
parent 976d167615
commit 53ab1c6498
4 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/infiniband/hw/qib/qib.h
View File

@ -807,6 +807,10 @@ struct qib_devdata {
* supports, less gives more pio bufs/ctxt, etc.
*/
u32 cfgctxts;
/*
* number of ctxts available for PSM open
*/
u32 freectxts;
/*
* hint that we should update pioavailshadow before

2
drivers/infiniband/hw/qib/qib_file_ops.c
View File

@ -1284,6 +1284,7 @@ static int setup_ctxt(struct qib_pportdata *ppd, int ctxt,
strlcpy(rcd->comm, current->comm, sizeof(rcd->comm));
ctxt_fp(fp) = rcd;
qib_stats.sps_ctxts++;
dd->freectxts++;
ret = 0;
goto bail;
@ -1792,6 +1793,7 @@ static int qib_close(struct inode *in, struct file *fp)
if (dd->pageshadow)
unlock_expected_tids(rcd);
qib_stats.sps_ctxts--;
dd->freectxts--;
}
mutex_unlock(&qib_mutex);

1
drivers/infiniband/hw/qib/qib_init.c
View File

@ -398,6 +398,7 @@ static void enable_chip(struct qib_devdata *dd)
if (rcd)
dd->f_rcvctrl(rcd->ppd, rcvmask, i);
}
dd->freectxts = dd->cfgctxts - dd->first_user_ctxt;
}
static void verify_interrupt(unsigned long opaque)

3
drivers/infiniband/hw/qib/qib_sysfs.c
View File

@ -515,8 +515,7 @@ static ssize_t show_nfreectxts(struct device *device,
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);
return scnprintf(buf, PAGE_SIZE, "%u\n", dd->freectxts);
}
static ssize_t show_serial(struct device *device,