From 53ab1c6498371723c31b18400fab10a902a15a63 Mon Sep 17 00:00:00 2001
From: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Date: Thu, 6 Oct 2011 09:33:35 -0700
Subject: [PATCH] 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>
---
drivers/infiniband/hw/qib/qib.h | 4 ++++
drivers/infiniband/hw/qib/qib_file_ops.c | 2 ++
drivers/infiniband/hw/qib/qib_init.c | 1 +
drivers/infiniband/hw/qib/qib_sysfs.c | 3 +--
4 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h
index c9624ea87209..ee993e725d38 100644
--- a/drivers/infiniband/hw/qib/qib.h
+++ b/drivers/infiniband/hw/qib/qib.h
@@ -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
diff --git a/drivers/infiniband/hw/qib/qib_file_ops.c b/drivers/infiniband/hw/qib/qib_file_ops.c
index 26253039d2c7..77633666f81c 100644
--- a/drivers/infiniband/hw/qib/qib_file_ops.c
+++ b/drivers/infiniband/hw/qib/qib_file_ops.c
@@ -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);
diff --git a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c
index a01f3fce8eb3..021636dbeae6 100644
--- a/drivers/infiniband/hw/qib/qib_init.c
+++ b/drivers/infiniband/hw/qib/qib_init.c
@@ -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)
diff --git a/drivers/infiniband/hw/qib/qib_sysfs.c b/drivers/infiniband/hw/qib/qib_sysfs.c
index 14d129de4320..78fbd56879d4 100644
--- a/drivers/infiniband/hw/qib/qib_sysfs.c
+++ b/drivers/infiniband/hw/qib/qib_sysfs.c
@@ -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,
--
2.34.1